Power conversion equipment and energy storage cabinet

Abstract

The utility model provides power conversion equipment and an energy storage cabinet, and belongs to the technical field of power conversion. The power conversion equipment comprises a shell, a power plate and a liquid cooling plate. The power plate is located in the shell, one side of the power plate comprises a plurality of power conversion modules, and the other side of the power plate is attached to the liquid cooling plate. The interior of the liquid cooling plate comprises a first main flow channel, at least two branch flow channels and a second main flow channel, and the two ends of each branch flow channel communicate with the first main flow channel and the second main flow channel correspondingly. In the direction perpendicular to the liquid cooling plate, the projections of at least two power conversion modules in the multiple power conversion modules at least partially coincide with the projections of the different branch flow channels. Thus, heat dissipation of the power conversion modules corresponding to different branch flow channels does not affect each other, the influence of thermal cascade is avoided or reduced, and the heat dissipation efficiency of each power conversion module is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power conversion, and particularly relates to a power conversion device and an energy storage cabinet. Background Art

[0002] With the development of the new energy industry, the power of power conversion devices has been continuously improved, and the power consumption of the power boards inside the power conversion devices has also been continuously increasing.

[0003] To meet the heat dissipation requirements of power conversion devices, in related technologies, liquid cooling plates are provided in power conversion devices. The liquid cooling plates are attached to the power boards, so that the heat generated by multiple power conversion modules on the power boards can be dissipated through the coolant in the liquid cooling plates.

[0004] However, the liquid cooling plates in related technologies cannot effectively dissipate heat from each power conversion module on the power board, and the heat dissipation efficiency of individual power conversion modules is relatively low. Summary of the Utility Model

[0005] The present disclosure provides a power conversion device and an energy storage cabinet. The liquid cooling plate of the power conversion device includes a plurality of branch flow channels arranged in parallel. At least two of the multiple power conversion modules are arranged opposite to different branch flow channels, so that the heat dissipation of these two power conversion modules does not affect each other, and both have a relatively high heat dissipation efficiency. The technical solutions of the power conversion device and the energy storage cabinet are as follows.

[0006] In a first aspect, the present disclosure provides a power conversion device. The power conversion device includes a housing, a power board, and a liquid cooling plate. The power board is located inside the housing. One side of the power board includes a plurality of power conversion modules, and the other side of the power board is attached to the liquid cooling plate. The inside of the liquid cooling plate includes a first main flow channel, at least two branch flow channels, and a second main flow channel. The two ends of each branch flow channel are respectively communicated with the first main flow channel and the second main flow channel. Along the direction perpendicular to the liquid cooling plate, the projections of at least two of the multiple power conversion modules at least partially coincide with the projections of different branch flow channels.

[0007] Among them, the power conversion device provided by the present disclosure is a power conversion system (PCS) or an inverter, etc.

[0008] The technical solution provided by the present disclosure includes a plurality of branch flow channels arranged in parallel in the liquid cooling plate. Along the direction perpendicular to the liquid cooling plate, the projections of at least two power conversion modules coincide with the projections of different branch flow channels. Then, the coolant in different branch flow channels respectively takes away the heat of at least two power conversion modules. Thus, the heat dissipation of each power conversion module corresponding to different branch flow channels does not affect each other, reducing the influence of thermal cascading and improving the heat dissipation efficiency of each power conversion module.

[0009] In one implementation, the multiple power conversion modules include an A-phase power conversion module, a B-phase power conversion module, and a C-phase power conversion module. The interior of the liquid cooling plate includes three branch flow channels. Along the direction perpendicular to the liquid cooling plate, the projections of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module respectively at least partially coincide with the projections of the three branch flow channels. In this way, the coolant flows through the regions corresponding to the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module respectively, and takes away the heat of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module respectively. Thus, the heat dissipation of one power conversion module will not be affected by the heat dissipated by the other two power conversion modules, reducing the influence of thermal cascading and improving the heat dissipation efficiency of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module.

[0010] In one implementation, the coolant in the liquid cooling plate flows through the first main flow channel, the three branch flow channels, and the second main flow channel in sequence. The multiple power conversion modules further include an N-phase power conversion module. Along the direction perpendicular to the liquid cooling plate, the projection of the N-phase power conversion module at least partially coincides with the projection of the first main flow channel. Among them, the power consumption of the N-phase power conversion module is greater than that of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module. In this way, the coolant first flows through the region corresponding to the N-phase power conversion module, and then flows through the regions corresponding to the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module respectively, so that the heat dissipation of the N-phase power conversion module will not be affected by the heat dissipation of the other three power conversion modules, which is beneficial to ensuring the heat dissipation effect of the N-phase power conversion module with the highest power consumption.

[0011] In one implementation, the coolant in the liquid cooling plate flows through the first main flow channel, the three branch flow channels, and the second main flow channel in sequence. One side of the power board further includes a balancing circuit and an anti-reverse module. Along the direction perpendicular to the liquid cooling plate, the projection of the balancing circuit and the projection of the anti-reverse module at least partially coincide with the projection of the first main flow channel. Among them, the power consumption of the balancing circuit and the anti-reverse module is much lower than that of the power conversion module. In this way, the coolant first flows through the regions corresponding to the balancing circuit and the anti-reverse module, and then flows through the regions corresponding to the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module, so that the heat dissipation of the balancing circuit and the anti-reverse module will not be affected by the heat dissipated by the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module. On the other hand, since the power consumption of the balancing circuit and the anti-reverse module is much smaller than that of the power conversion module, the heat dissipated by the balancing circuit and the anti-reverse module causes a small increase in the temperature of the coolant, and thus has a small impact on the heat dissipation of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module.

[0012] In one implementation, the liquid cooling plate further includes three first flow disturbance members and a second flow disturbance member. The three first flow disturbance members are respectively located in three branch channels. Along the direction perpendicular to the liquid cooling plate, the projections of the three first flow disturbance members respectively coincide at least partially with the projections of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module. The second flow disturbance member is located in the first main channel. Along the direction perpendicular to the liquid cooling plate, the projection of the second flow disturbance member coincides at least partially with the projection of the N-phase power conversion module. The first flow disturbance member and the second flow disturbance member are used to disturb the coolant, and the flow disturbance ability of the first flow disturbance member is higher than that of the second flow disturbance member.

[0013] Among them, the definition of the flow disturbance ability of the flow disturbance member is as follows: On the premise that other conditions such as the size of the flow disturbance member, the size of the channel, and the flow rate of the coolant are the same, corresponding to the same heat source, the higher the temperature of the coolant flowing through the flow disturbance member (that is, the more sufficient the coolant absorbs heat), the stronger the flow disturbance ability of the flow disturbance member. Correspondingly, the flow disturbance abilities of the first flow disturbance member and the second flow disturbance member can be measured in the following manner: First, place the first flow disturbance member in the channel, set a heat source (such as a power conversion module) corresponding above the channel, and measure the temperature of the coolant at the first flow disturbance member. Then, take out the first flow disturbance member, place the second flow disturbance member at the same position in the same channel, and measure the temperature of the coolant at the second flow disturbance member. If the temperature of the coolant at the first flow disturbance member is higher than the temperature of the coolant at the second flow disturbance member, it indicates that the flow disturbance ability of the first flow disturbance member is greater than that of the second flow disturbance member.

[0014] In the technical solution provided by the present disclosure, since the flow rate of the first main channel is greater than the flow rates of the branch channels, without considering the flow disturbance members, the heat dissipation ability of the first main channel is better than that of the branch channels. By setting the flow disturbance ability of the first flow disturbance member to be greater than that of the second flow disturbance member, the present disclosure improves the heat dissipation ability of the branch channels, makes the heat dissipation abilities of the branch channels and the first main channel tend to be the same, and further improves the heat dissipation effects of the A-phase power conversion module, the B-phase power conversion module, and the C-phase power conversion module.

[0015] In one implementation, the first flow disturbance member includes a plurality of first flow disturbance teeth, and the second flow disturbance member includes a plurality of second flow disturbance teeth. The structures of the first flow disturbance teeth and the second flow disturbance teeth are the same, and the tooth shape of the first flow disturbance teeth facing the coolant in the branch channel is different from the tooth shape of the second flow disturbance teeth facing the coolant in the first main channel.

[0016] For the technical solution provided by the present disclosure, on the one hand, since the structures of the first spoiler teeth and the second spoiler teeth are the same, the first spoiler member and the second spoiler member can be manufactured using the same mold, realizing co-mold design, without the need to develop two sets of molds, thus reducing the manufacturing cost of the liquid cooling plate. On the other hand, by setting the tooth shapes of the first spoiler teeth facing the coolant in the branch flow channel to be different from the tooth shapes of the second spoiler teeth facing the coolant in the first main flow channel, it is also possible to achieve that the flow disturbing ability of the first spoiler member is greater than that of the second spoiler member.

[0017] In one implementation, along the flow direction of the first main flow channel, the projected pattern of the second spoiler teeth is U-shaped or inverted U-shaped. Along the flow direction of the branch flow channel, the projected pattern of the first spoiler teeth is strip-shaped.

[0018] In one implementation, the cross-sections of both the first spoiler teeth and the second spoiler member are diamond-shaped, and the diamond has two obtuse angles and two acute angles. The two obtuse angles corresponding to the first spoiler teeth are arranged in sequence along the flow direction of the branch flow channel. The two acute angles corresponding to the second spoiler teeth are arranged in sequence along the flow direction of the first main flow channel. Among them, the flow disturbing ability of the obtuse angle is greater than that of the acute angle, which makes the flow disturbing ability of a single first spoiler tooth greater than that of a single second spoiler tooth, facilitating the achievement of the flow disturbing ability of the first spoiler member being greater than that of the second spoiler member.

[0019] In one implementation, along the direction perpendicular to the flow direction of the branch flow channel, the distance between two adjacent first spoiler teeth is the first distance. Along the direction perpendicular to the flow direction of the first main flow channel, the distance between two adjacent second spoiler teeth is the second distance. Among them, the first distance is less than or equal to the second distance. Among them, the smaller the distance between the spoiler teeth, the stronger the flow disturbing ability of the spoiler member. Therefore, by setting the first distance to be less than or equal to the second distance, it is beneficial to achieve that the flow disturbing ability of the first spoiler member is greater than that of the second spoiler member.

[0020] In one implementation, the multiple power conversion modules include an A-phase power conversion module, a B-phase power conversion module, a C-phase power conversion module, and an N-phase power conversion module. The interior of the liquid cooling plate includes four branch flow channels. Along the direction perpendicular to the liquid cooling plate, the projections of the A-phase power conversion module, the B-phase power conversion module, the C-phase power conversion module, and the N-phase power conversion module respectively at least partially coincide with the projections of the four branch flow channels. In this way, the coolant in the four branch flow channels respectively flows through the regions corresponding to each power conversion module, and takes away the heat of each power conversion module respectively, so that the heat dissipation of one power conversion module will not be affected by the heat dissipated by any other power conversion module, and each power conversion module has a good heat dissipation effect.

[0021] In a second aspect, the present disclosure provides an energy storage cabinet. The energy storage cabinet includes a power conversion device, a battery pack, a cabinet body, and a liquid cooling pipeline. The power conversion device is the power conversion device according to any one of the first aspect. The power conversion device and the battery pack are located inside the cabinet body. The liquid cooling pipeline is communicated with the liquid cooling plate of the power conversion device and the liquid cooling plate of the battery pack. In this way, both the battery pack and the power conversion device have good heat dissipation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded view of a power conversion device provided by an embodiment of the present disclosure;

[0023] Figure 2 is a schematic diagram of a liquid cooling plate, a power board, an inductor module, and an in-cavity radiator provided by an embodiment of the present disclosure;

[0024] Figure 3 is a schematic diagram of a liquid cooling plate provided by an embodiment of the present disclosure;

[0025] Figure 4 is a schematic diagram of a flow channel of a liquid cooling plate provided by an embodiment of the present disclosure;

[0026] Figure 5 is a schematic diagram of a flow channel of a liquid cooling plate provided by an embodiment of the present disclosure;

[0027] Figure 6 is a schematic diagram of the relative position relationship between a flow channel of a liquid cooling plate and electronic components provided by an embodiment of the present disclosure;

[0028] Figure 7 is a schematic diagram of a flow disturbing member provided by an embodiment of the present disclosure;

[0029] Figure 8 is a schematic diagram of a first flow disturbing member and a branch flow channel provided by an embodiment of the present disclosure;

[0030] Figure 9 is a schematic diagram of a second flow disturbing member and a first main flow channel provided by an embodiment of the present disclosure;

[0031] Figure 10 is a schematic diagram of a flow disturbing member provided by an embodiment of the present disclosure;

[0032] Figure 11 is a schematic diagram of a first flow disturbing member and a branch flow channel provided by an embodiment of the present disclosure;

[0033] Figure 12 is a schematic diagram of a second flow disturbing member and a first main flow channel provided by an embodiment of the present disclosure;

[0034] Figure 13 is a schematic diagram of an energy storage cabinet provided by an embodiment of the present disclosure.

[0035] Legend Explanation

[0036] 100, Power conversion device; 200, Battery pack; 300, Cabinet; 400, Liquid cooling pipeline; 401, Inlet pipeline; 402, Outlet pipeline;

[0037] 1, Housing;

[0038] 2, Power board; 21, Phase A power conversion module; 22, Phase B power conversion module; 23, Phase C power conversion module; 24, Phase N power conversion module; 25, Balancing circuit; 26, Reverse protection module;

[0039] 3, Liquid cooling plate; 30, Water nozzle; 301, Inlet; 302, Outlet; 31, Substrate; 311, First main flow channel; 312, Branch flow channel; 313, Second main flow channel; 32, Cover plate; 33, First flow disturbance member; 331, First flow disturbance teeth; 332, First bottom plate; 34, Second flow disturbance member; 341, Second flow disturbance teeth; 342, Second bottom plate;

[0040] 4, Inductor assembly; 41, Inverter inductor; 42, Balancing inductor;

[0041] 5, Internal cavity radiator;

[0042] 6, Capacitor plate;

[0043] 7, Output board. Detailed Implementation Manner

[0044] With the development of the new energy industry, the power of power conversion devices has been continuously improved, and the power consumption of electronic components inside power conversion devices has also been increasing. At present, the heat dissipation technology route of power conversion devices mainly focuses on air cooling, and liquid cooling is relatively less. With the increase in the power density of power conversion devices and requirements such as overload, the heat dissipation density of air cooling cannot meet the heat dissipation requirements of power conversion devices. The liquid cooling heat dissipation technology solution has the characteristics of large heat flux density and low cost, so it is gradually applied to power conversion devices. In the liquid cooling heat dissipation technology solution, the liquid cooling plate is a key component, and its design solution determines the system heat dissipation capacity and cost.

[0045] As Figure 1 shown, the power conversion device 100 includes a housing 1, a power board 2, a liquid cooling plate 3, an inductor assembly 4, an internal cavity radiator 5, a capacitor plate 6, and an output board 7. The liquid cooling plate 3 is attached to the power board 2, the inductor assembly 4, and the internal cavity radiator 5, and the liquid cooling plate 3 is used to dissipate heat from the power board 2, the inductor assembly 4, and the internal cavity radiator 5. Among them, the capacitor plate 6 and the output board 7 are suitable for air cooling. After the cold air blows towards the capacitor plate 6 and the output board 7, it becomes hot air, and the hot air exchanges heat with the internal cavity radiator 5, and the heat of the internal cavity radiator 5 is then dissipated through the liquid cooling plate 3.

[0046] As shown Figure 2 in the figure, one side of the power board 2 includes a plurality of power conversion modules (A-phase power conversion module 21, B-phase power conversion module 22, C-phase power conversion module 23, and N-phase power conversion module 24), a balance circuit 25, and an anti-reverse module 26. The other side of the power board 2 is attached to the liquid cooling plate 3. In addition, the inductor assembly 4 and the cavity radiator 5 are also attached to the liquid cooling plate 3. Among them, the inductor assembly 4 includes three inverter inductors 41 and a balance inductor 42.

[0047] In the related art, the inside of the liquid cooling plate 3 includes a flow channel (not shown in the figure), and the coolant in this flow channel flows through the areas corresponding to each electronic component in sequence. Specifically, the coolant flows through the areas corresponding to the cavity radiator 5, the three inverter inductors 41, the balance inductor 42, the N-phase power conversion module 24, the balance circuit 25, the A-phase power conversion module 21, the B-phase power conversion module 22, the C-phase power conversion module 23, and the anti-reverse module 26 in sequence. Among them, the heat flux density in the area corresponding to the power conversion module is the most concentrated, and the heat dissipation load is the largest.

[0048] Since the coolant flows through the areas corresponding to each electronic component in sequence, the temperature of the coolant continuously rises during the flow process, which will cause the heat dissipation of the electronic components in the downstream to deteriorate. Taking the power conversion module as an example, for the C-phase power conversion module 23, the coolant first flows through the areas corresponding to the N-phase power conversion module 24, the A-phase power conversion module 21, and the B-phase power conversion module 22, and then flows through the area corresponding to the C-phase power conversion module 23. This makes the temperature of the coolant relatively high when it flows to the C-phase power conversion module 23, resulting in a low heat dissipation efficiency of the C-phase power conversion module 23. This phenomenon can also be called the thermal cascade phenomenon.

[0049] In view of the above technical problems, the embodiments of the present disclosure provide a novel power conversion device 100. As shown Figure 3 and Figure 4 in the figure, the inside of the liquid cooling plate 3 in the power conversion device 100 includes a first main flow channel 311, a plurality of branch flow channels 312, and a second main flow channel 313. The two ends of each branch flow channel 312 are respectively communicated with the first main flow channel 311 and the second main flow channel 313. Among them, the plurality of branch flow channels 312 are arranged in parallel.

[0050] As shown Figure 3 and Figure 4As shown, the liquid cooling plate 3 includes a base plate 31 and a cover plate 32. One of the base plate 31 and the cover plate 32 is provided with a groove, and the other closes the groove. A flow channel is formed by enclosing between the groove wall of the groove and the plate surface of the other plate body. Among them, the base plate 31 is the thicker plate body of the liquid cooling plate 3, and the cover plate 32 is the thinner plate body of the liquid cooling plate 3. The base plate 31 and the cover plate 32 can be fixed together by welding (such as brazing). The base plate 31 and the cover plate 32 can both be aluminum plates.

[0051] The embodiments of the present disclosure do not limit which one of the base plate 31 and the cover plate 32 is provided with a groove. In some examples, as Figure 4 shown, the base plate 31 is provided with a groove, and the cover plate 32 closes the groove. Among them, the groove on the base plate 31 can be formed by machining. In other examples, the cover plate 32 is provided with a groove (not shown in the figure), and the base plate 31 closes the groove. Among them, since the cover plate 32 is relatively thin, the groove on the cover plate 32 can be formed by a stamping process. Among them, the stamping process has the advantages of fast speed and low cost when mass-producing the liquid cooling plate 3.

[0052] In some examples, as Figures 1 - 4 shown, the liquid cooling plate 3 further includes a water nozzle 30, and the water nozzle 30 is fixed to the base plate 31 or the cover plate 32. The water nozzle 30 includes a liquid inlet 301 and a liquid outlet 302. As Figure 4 shown, the liquid inlet 301 communicates with one end of the first main flow channel 311, and the liquid outlet 302 communicates with one end of the second main flow channel 313. Among them, the liquid inlet 301 and the liquid outlet 302 of the water nozzle 30 are used to connect to an external liquid cooling pipeline, so that the cooled coolant enters the inside of the liquid cooling plate 3 through the liquid inlet 301, and the heated coolant flows out through the liquid outlet 302. After the heated coolant flows out through the liquid outlet 302, it is cooled and then enters the inside of the liquid cooling plate 3 again through the liquid inlet 301. Thus, the circulating flow of the coolant is realized.

[0053] Figure 5 shows a schematic diagram of the flow path of the coolant inside the liquid cooling plate 3. As Figure 5 shown, the coolant flows into the inside of the first main flow channel 311 from the liquid inlet 301 of the water nozzle 30, and then flows through a plurality of branch flow channels 312 respectively. The coolant flowing out of the plurality of branch flow channels 312 converges in the second main flow channel 313 and then flows out through the liquid outlet 302 of the water nozzle 30.

[0054] Figure 6 shows a schematic diagram of the corresponding relationship between each electronic component in the power conversion device 100 and the flow channel in the liquid cooling plate 3. As Figure 6As shown in the figure, along the direction perpendicular to the liquid cooling plate 3, the projections of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23 respectively at least partially coincide with the projections of the three branch channels 312. In this way, the coolant flows through the areas corresponding to the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23 respectively, and takes away the heat of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23 respectively. Thus, the heat dissipation of one power conversion module will not be affected by the heat dissipated by the other two power conversion modules, reducing the influence of thermal cascading and improving the heat dissipation efficiency of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23.

[0055] In some other examples, as Figure 6 shown, along the direction perpendicular to the liquid cooling plate 3, the projection of the N-phase power conversion module 24 at least partially coincides with the projection of the first main channel 311. Among them, the power consumption and temperature of the N-phase power conversion module 24 are higher than those of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23. Specifically, the working duration of the N-phase power conversion module 24 is longer than that of the other power conversion modules.

[0056] As Figure 6 shown, the coolant first flows through the area corresponding to the N-phase power conversion module 24, and then flows through the areas corresponding to the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23 respectively, so that the heat dissipation of the N-phase power conversion module 24 will not be affected by the heat dissipated by the other power conversion modules. And because the power consumption and temperature of the N-phase power conversion module 24 are higher than those of the other phase power conversion modules, this design can ensure the heat dissipation effect of the N-phase power conversion module 24 with higher power consumption.

[0057] In some other examples, the interior of the liquid cooling plate 3 includes four branch channels 312 (not shown in the figure), and along the direction perpendicular to the liquid cooling plate 3, the projections of the A-phase power conversion module 21, the B-phase power conversion module 22, the C-phase power conversion module 23, and the N-phase power conversion module 24 respectively at least partially coincide with the projections of the four branch channels 312. In this way, the coolant flows through the areas corresponding to the A-phase power conversion module 21, the B-phase power conversion module 22, the C-phase power conversion module 23, and the N-phase power conversion module 24 respectively, so that the heat dissipation of any one of the A-phase power conversion module 21, the B-phase power conversion module 22, the C-phase power conversion module 23, and the N-phase power conversion module 24 will not be affected by the heat dissipated by the other three power conversion modules, reducing the influence of thermal cascading and enabling each power conversion module to have a high heat dissipation efficiency.

[0058] In some examples, since the power consumption and temperature of the N-phase power conversion module 24 are higher, the flow rate of the branch flow channel 312 corresponding to the N-phase power conversion module 24 is set to be greater than the flow rates of the other three branch flow channels 312, so that the heat dissipation capacity of the branch flow channel 312 corresponding to the N-phase power conversion module 24 is higher.

[0059] In other examples, the interior of the liquid cooling plate 3 includes two branch flow channels 312, and along the direction perpendicular to the liquid cooling plate 3, the projections of two power conversion modules (such as N phase and A phase) partially overlap with the projection of one branch flow channel 312, and the projections of the other two power conversion modules (such as B phase and C phase) partially overlap with the projection of the other branch flow channel 312 (not shown in the figure). In this way, the heat dissipation of each power conversion module is at most affected by the heat dissipated by one power conversion module, which also reduces the influence of thermal cascade and improves the heat dissipation efficiency of the power conversion module.

[0060] It should be noted that the above-mentioned technical solutions can be summarized as follows: the projections of at least two power conversion modules among the multiple power conversion modules overlap at least partially with the projections of different branch flow channels 312. In this way, the coolant in the different branch flow channels 312 takes away the heat of the at least two power conversion modules. Therefore, the heat dissipation of each power conversion module corresponding to the different branch flow channels 312 will not affect each other, reducing the influence of thermal cascade and improving the heat dissipation efficiency of each power conversion module.

[0061] In some examples, such as Figure 6 As shown, one side of the power board 2 also includes a balancing circuit 25 and an anti-reverse module 26. Along the direction perpendicular to the liquid cooling plate 3, the projection of the balancing circuit 25, the projection of the anti-reverse module 26 and the projection of the first main channel 311 at least partially overlap. In this way, the coolant first flows through the areas corresponding to the balancing circuit 25 and the anti-reverse module 26, and then flows through the areas corresponding to the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23, respectively, so that the temperature of the coolant flowing through the areas corresponding to the balancing circuit 25 and the anti-reverse module 26 is relatively low, which is conducive to improving the heat dissipation effect of the balancing circuit 25 and the anti-reverse module 26. On the other hand, since the power consumption of the balancing circuit 25 and the anti-reverse module 26 is much smaller than the power consumption of the power conversion module, the heat dissipated by the balancing circuit 25 and the anti-reverse module 26 makes the temperature of the coolant rise less, and the influence on the heat dissipation of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23 is also relatively small.

[0062] The embodiments of the present disclosure do not limit whether the coolant first flows through the regions corresponding to the balance circuit 25 and the anti-reverse module 26 or first flows through the region corresponding to the N-phase power conversion module 24. In some examples, if the coolant first flows through the regions corresponding to the balance circuit 25 and the anti-reverse module 26 and then flows through the region corresponding to the N-phase power conversion module 24, the influence of the heat dissipated by the N-phase power conversion module 24 on the heat dissipation of the balance circuit 25 and the anti-reverse module 26 can be reduced. Moreover, since the power consumption of the balance circuit 25 and the anti-reverse module 26 is relatively low, it will not have too much impact on the N-phase power conversion module 24.

[0063] In other examples, as Figure 6 shown, limited by the layout of each electronic component on the power board 2, the coolant can also first flow through the region corresponding to the N-phase power conversion module 24 and then flow through the regions corresponding to the balance circuit 25 and the anti-reverse module 26. In this way, compared with the prior art solution where the anti-reverse module 26 is located at the far downstream of all electronic components, the heat dissipation efficiency of the anti-reverse module 26 in the embodiments of the present disclosure is also higher.

[0064] Next, the sequence of the regions corresponding to each electronic component that the coolant passes through when flowing inside the liquid cooling plate 3 will be described.

[0065] As Figure 6 shown, the coolant flows into the inside of the first main flow channel 311, and then sequentially flows through the regions corresponding to the cavity radiator 5, the three inverter inductors 41, the balance inductor 42, the N-phase power conversion module 24, the balance circuit 25, and the anti-reverse module 26. Then, the coolant respectively flows into the three branch flow channels 312 and then respectively flows through the regions corresponding to the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23. Finally, the coolant in the three branch flow channels 312 flows into the second main flow channel 313 and then flows out through the liquid outlet 302 of the water nozzle 30.

[0066] In some examples, as Figures 4 - 6 shown, the liquid cooling plate 3 further includes three first flow disturbing members 33. The three first flow disturbing members 33 are respectively located in the three branch flow channels 312. As Figure 6 shown, along the direction perpendicular to the liquid cooling plate 3, the projections of the three first flow disturbing members 33 respectively at least partially overlap with the projections of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23.

[0067] Among them, the first flow disturbing member 33 is used to disturb the coolant in the branch flow channel 312, so that the coolant can absorb heat more fully in the region where the first flow disturbing member 33 is located, improving the convective heat transfer ability and convective mixing ability of the coolant.

[0068] In the technical solution provided by the embodiments of the present disclosure, since the multiple branch channels 312 are arranged in parallel, the flow rate of each branch channel 312 is smaller than that of the first main channel 311. Among them, the sum of the flow rates of the multiple branch channels 312 is equal to the flow rate of the first main channel 311. The decrease in the flow rate will cause a decrease in the heat dissipation capacity of each branch channel 312. By arranging the first flow disturbing member 33 in each branch channel 312, the local heat dissipation capacity of each branch channel 312 is improved, compensating for the decrease in the heat dissipation capacity caused by the decrease in the flow rate of each branch channel 312, and improving the heat dissipation efficiency of the A-phase power conversion module 21, the B-phase power conversion module 22, and the C-phase power conversion module 23.

[0069] In some examples, as Figures 4 - 6 shown, the liquid cooling plate 3 further includes a second flow disturbing member 34, and the second flow disturbing member 34 is located in the first main channel 311. As Figure 6 shown, along the direction perpendicular to the liquid cooling plate 3, the projection of the second flow disturbing member 34 at least partially coincides with the projection of the N-phase power conversion module 24.

[0070] Among them, the second flow disturbing member 34 is used to disturb the coolant in the first main channel 311, so that the coolant can absorb heat more fully in the area where the second flow disturbing member 34 is located, improving the convective heat transfer capacity and convective mixing capacity of the coolant.

[0071] In addition, since the flow rate of the first main channel 311 is greater than that of each branch channel 312, without considering the flow disturbing member, the heat dissipation capacity of the first main channel 311 is better than that of the branch channel 312. Therefore, in some examples, the flow disturbing capacity of the first flow disturbing member 33 is set to be greater than that of the second flow disturbing member 34 in order to make the heat dissipation capacity of the branch channel 312 close to that of the first main channel 311.

[0072] Among them, the flow disturbing capacity of the flow disturbing member can be defined as follows: on the premise that other conditions such as the size of the flow disturbing member, the size of the channel, and the flow rate of the coolant are the same, for the same heat source, the higher the temperature of the coolant flowing through the flow disturbing member (that is, the more fully the coolant absorbs heat), the stronger the flow disturbing capacity of the flow disturbing member.

[0073] Correspondingly, the flow disturbing capabilities of the first flow disturbing member 33 and the second flow disturbing member 34 can be measured as follows: First, place the first flow disturbing member 33 in the flow channel, and correspondingly set a heat source above the flow channel to measure the temperature of the coolant at the first flow disturbing member 33. Then, take out the first flow disturbing member 33, place the second flow disturbing member 34 at the same position in the same flow channel, and measure the temperature of the coolant at the second flow disturbing member 34. If the temperature of the coolant at the first flow disturbing member 33 is higher than the temperature of the coolant at the second flow disturbing member 34, it indicates that the flow disturbing capability of the first flow disturbing member 33 is greater than that of the second flow disturbing member 34.

[0074] It should be noted that grooves can be opened on the plate body (substrate 31 or cover plate 32) of the liquid cooling plate 3 at the positions corresponding to the flow disturbing members, and temperature sensors can be placed in the grooves. The temperature measured by the temperature sensors is used to characterize the temperature of the coolant.

[0075] In some examples, such as Figure 6 As shown, there are multiple second flow disturbing members 34. Along the direction perpendicular to the liquid cooling plate 3, the projections of the multiple second flow disturbing members 34 respectively at least partially coincide with the projections of the in-cavity radiator 5, the three inverter inductors 41, the balance inductor 42, the balance circuit 25, the anti-reverse module 26, and the N-phase power conversion module 24, so as to improve the heat dissipation effects of the in-cavity radiator 5, the three inverter inductors 41, the balance inductor 42, the balance circuit 25, the anti-reverse module 26, and the N-phase power conversion module 24.

[0076] The present disclosure embodiment does not limit the implementation manner of the first flow disturbing member 33 having a greater flow disturbing capability than the second flow disturbing member 34. In some examples, flow disturbing members with two different structures are set, and the flow disturbing member with a greater flow disturbing capability is used as the first flow disturbing member 33, and the flow disturbing member with a smaller flow disturbing capability is used as the second flow disturbing member 34.

[0077] In other examples, flow disturbing members with the same structure are set, and the flow disturbing capabilities of the flow disturbing members are changed by changing the postures of the flow disturbing members in the flow channel. For example, as Figures 7 - 9 or Figures 10 - 12 As shown, the first flow disturbing member 33 includes multiple first flow disturbing teeth 331. The second flow disturbing member 34 includes multiple second flow disturbing teeth 341. The first flow disturbing teeth 331 and the second flow disturbing teeth 341 have the same structure, and the tooth shape of the first flow disturbing teeth 331 facing the coolant in the branch flow channel 312 is different from the tooth shape of the second flow disturbing teeth 341 facing the coolant in the first main flow channel 311.

[0078] In this way, on the one hand, the first spoiler 33 and the second spoiler 34 include spoiler teeth with the same structure, enabling the first spoiler 33 and the second spoiler 34 to adopt the same mold design without the need to develop two sets of molds, thus reducing costs. On the other hand, by setting the tooth shape of the first spoiler tooth 331 facing the coolant in the branch flow channel 312 to be different from the tooth shape of the second spoiler tooth 341 facing the coolant in the first main flow channel 311, the spoiler ability of the first spoiler 33 can be made greater than that of the second spoiler 34.

[0079] Next, an exemplary description will be given of the tooth shapes of the first spoiler tooth 331 and the second spoiler tooth 341.

[0080] In some examples, as Figures 7 - 9 shown, along the flow direction of the first main flow channel 311, the projected pattern of the second spoiler tooth 341 is U-shaped or inverted U-shaped. Along the flow direction of the branch flow channel 312, the projected pattern of the first spoiler tooth 331 is strip-shaped, and one end of the strip points to the substrate 31 and the other end points to the cover plate 32.

[0081] In some examples, as Figures 10 - 12 shown, the cross-sections of both the first spoiler tooth 331 and the second spoiler tooth 341 are diamond-shaped, and the diamond has two obtuse angles and two acute angles. The two obtuse angles corresponding to the first spoiler tooth 331 are arranged in sequence along the flow direction of the branch flow channel 312. The two acute angles corresponding to the second spoiler tooth 341 are arranged in sequence along the flow direction of the first main flow channel 311. Among them, since the spoiler ability of an obtuse angle is greater than that of an acute angle, the spoiler ability of a single first spoiler tooth 331 is greater than that of a single second spoiler tooth 341, which is conducive to making the spoiler ability of the first spoiler 33 greater than that of the second spoiler 34.

[0082] In some examples, as Figure 11 shown, along the direction perpendicular to the flow direction of the branch flow channel 312, the distance between two adjacent first spoiler teeth 331 is the first distance L1. As Figure 12 shown, along the direction perpendicular to the flow direction of the first main flow channel 311, the distance between two adjacent second spoiler teeth 341 is the second distance L2. Among them, the first distance L1 is less than or equal to the second distance L2. Among them, the smaller the distance between the spoiler teeth, the stronger the spoiler ability of the spoiler. Therefore, by setting the first distance L1 to be less than or equal to the second distance L2, it is also conducive to making the spoiler ability of the first spoiler 33 greater than that of the second spoiler 34.

[0083] Of course, in some other examples, the above first distance L1 can also be greater than the second distance L2, and the embodiments of the present disclosure do not limit this.

[0084] In some examples, as Figure 10As shown, the first spoiler 33 includes a first bottom plate 332, and a plurality of first spoiler teeth 331 are fixed to the same surface of the first bottom plate 332. The second spoiler 34 includes a second bottom plate 342, and a plurality of second spoiler teeth 341 are fixed to the same surface of the second bottom plate 342. Among them, the first bottom plate 332 and the second bottom plate 342 have the same thickness. Of course, as Figure 7 shown, the spoiler may not include a bottom plate, and each spoiler tooth is connected to form a spoiler.

[0085] The embodiments of the present disclosure do not limit the installation method of the spoiler (the first spoiler 33 or the second spoiler 34) on the substrate 31 or the cover plate 32. In some examples, the spoiler is manufactured independently of the substrate 31 or the cover plate 32, and the spoiler is fixed on the substrate 31 or the cover plate 32. For example, the spoiler is welded to the substrate 31 or the cover plate 32. In other examples, the spoiler is integrally formed on the substrate 31. For example, on the substrate 31, a flow channel and a spoiler are machined.

[0086] It should be noted that the above spoiler can also be called a reinforced heat dissipation fin, a reinforced heat dissipation fin or a reinforced heat dissipation tooth piece, etc.

[0087] The embodiments of the present disclosure do not limit the specific type of the power conversion device 100. In some examples, the power conversion device 100 is an energy storage converter (power conversion system, PCS) or an inverter, etc. Taking the PCS as an example, the PCS is a bidirectional current controllable conversion device connecting an energy storage battery and a power grid (or load), used to control the charging and discharging processes of the storage battery, and perform AC-DC conversion. The PCS can accurately and quickly adjust the voltage, frequency and power between the power grid and the energy storage system, realize constant power and constant current charging and discharging, and smooth the output of fluctuating power supplies.

[0088] The embodiments of the present disclosure also provide an energy storage cabinet. As Figure 13 shown, the energy storage cabinet includes a power conversion device 100, a battery pack 200, a cabinet body 300 and a liquid cooling pipeline 400. The power conversion device 100 and the battery pack 200 are located inside the cabinet body 300. The liquid cooling pipeline 400 is communicated with the liquid cooling plate 3 of the power conversion device 100 and the liquid cooling plate of the battery pack 200. In this way, the power conversion device 100 and the battery pack 200 adopt liquid cooling for heat dissipation, and the heat dissipation effect is relatively high.

[0089] In some examples, as Figure 13As shown, the liquid cooling pipeline 400 includes an inlet pipeline 401 and an outlet pipeline 402. The inlet pipeline 401 is communicated with the inlet port 301 of the water nozzle 30 of the liquid cooling plate 3. The outlet pipeline 402 is communicated with the outlet port 302 of the water nozzle 30 of the liquid cooling plate 3. Among them, the cooling liquid in the inlet pipeline 401 flows into the interior of the liquid cooling plate 3 through the inlet port 301 of the water nozzle 30, and the cooling liquid flows along the internal flow path of the liquid cooling plate 3. After that, it flows into the outlet pipeline 402 through the outlet port 302 of the water nozzle 30 and flows out through the outlet pipeline 402.

[0090] The terms used in the embodiments of the present disclosure are only for explaining the embodiments of the present disclosure and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be the ordinary meanings understood by those of ordinary skill in the field to which the present disclosure belongs. The above are only alternative embodiments of the present disclosure and are not used to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A power conversion device, characterized in that, The power conversion device (100) includes a housing (1), a power board (2), and a liquid cooling plate (3); The power board (2) is located inside the housing (1). One side of the power board (2) includes a plurality of power conversion modules, and the other side of the power board (2) is attached to the liquid cooling plate (3); The interior of the liquid cooling plate (3) includes a first main flow channel (311), at least two branch flow channels (312), and a second main flow channel (313). Both ends of each branch flow channel (312) are respectively communicated with the first main flow channel (311) and the second main flow channel (313); In a direction perpendicular to the liquid cooling plate (3), the projections of at least two of the plurality of power conversion modules at least partially coincide with the projections of different branch flow channels (312).

2. The power conversion device according to claim 1, characterized in that, The plurality of power conversion modules include an A-phase power conversion module (21), a B-phase power conversion module (22), and a C-phase power conversion module (23); The interior of the liquid cooling plate (3) includes three branch flow channels (312). In a direction perpendicular to the liquid cooling plate (3), the projections of the A-phase power conversion module (21), the B-phase power conversion module (22), and the C-phase power conversion module (23) respectively at least partially coincide with the projections of the three branch flow channels (312).

3. The power conversion device according to claim 2, wherein, The coolant in the liquid cooling plate (3) flows through the first main flow channel (311), the three branch flow channels (312), and the second main flow channel (313) in sequence; The plurality of power conversion modules further include an N-phase power conversion module (24). In a direction perpendicular to the liquid cooling plate (3), the projection of the N-phase power conversion module (24) at least partially coincides with the projection of the first main flow channel (311).

4. The power conversion device according to claim 2 or 3, characterized in that, The coolant in the liquid cooling plate (3) flows through the first main flow channel (311), the three branch flow channels (312), and the second main flow channel (313) in sequence; One side of the power board (2) further includes a balance circuit (25) and an anti-reverse module (26). In a direction perpendicular to the liquid cooling plate (3), the projection of the balance circuit (25) and the projection of the anti-reverse module (26) at least partially coincide with the projection of the first main flow channel (311).

5. The power conversion device according to claim 3, characterized in that, The liquid cooling plate (3) further includes three first flow spoilers (33) and a second flow spoiler (34); The three first flow spoilers (33) are respectively located in the three branch flow channels (312). In a direction perpendicular to the liquid cooling plate (3), the projections of the three first flow spoilers (33) respectively at least partially coincide with the projections of the A-phase power conversion module (21), the B-phase power conversion module (22), and the C-phase power conversion module (23); The second flow spoiler (34) is located in the first main flow channel (311). In a direction perpendicular to the liquid cooling plate (3), the projection of the second flow spoiler (34) at least partially coincides with the projection of the N-phase power conversion module (24); Among them, the first spoiler (33) and the second spoiler (34) are used to disturb the coolant, and the spoiler ability of the first spoiler (33) is higher than that of the second spoiler (34).

6. The power conversion device according to claim 5, characterized in that, The first spoiler (33) includes a plurality of first spoiler teeth (331), and the second spoiler (34) includes a plurality of second spoiler teeth (341); The structures of the first spoiler teeth (331) and the second spoiler teeth (341) are the same, and the tooth shape of the first spoiler teeth (331) facing the coolant in the branch flow channel (312) is different from the tooth shape of the second spoiler teeth (341) facing the coolant in the first main flow channel (311).

7. The power conversion device according to claim 6, characterized in that, Along the flow direction of the first main flow channel (311), the projected pattern of the second spoiler teeth (341) is U-shaped or inverted U-shaped; Along the flow direction of the branch flow channel (312), the projected pattern of the first spoiler teeth (331) is strip-shaped.

8. The power conversion device according to claim 6, characterized in that The cross-sections of the first spoiler teeth (331) and the second spoiler teeth (341) are both diamond-shaped, and the diamond shape has two obtuse angles and two acute angles; The two obtuse angles corresponding to the first spoiler teeth (331) are arranged in sequence along the flow direction of the branch flow channel (312); The two acute angles corresponding to the second spoiler teeth (341) are arranged in sequence along the flow direction of the first main flow channel (311).

9. The power conversion device according to claim 8, characterized in that, Along the direction perpendicular to the flow direction of the branch flow channel (312), the distance between two adjacent first spoiler teeth (331) is the first distance (L1); Along the direction perpendicular to the flow direction of the first main flow channel (311), the distance between two adjacent second spoiler teeth (341) is the second distance (L2); Among them, the first distance (L1) is less than or equal to the second distance (L2).

10. The power conversion device according to claim 1, wherein The plurality of power conversion modules include an A-phase power conversion module (21), a B-phase power conversion module (22), a C-phase power conversion module (23), and an N-phase power conversion module (24); The interior of the liquid cooling plate (3) includes four branch flow channels (312). Along the direction perpendicular to the liquid cooling plate (3), the projections of the A-phase power conversion module (21), the B-phase power conversion module (22), the C-phase power conversion module (23), and the N-phase power conversion module (24) respectively at least partially coincide with the projections of the four branch flow channels (312).

11. A energy storage cabinet, characterized in that, The energy storage cabinet includes a power conversion device (100), a battery pack (200), a cabinet body (300), and a liquid cooling pipeline (400), and the power conversion device (100) is the power conversion device according to any one of claims 1-10; The power conversion device (100) and the battery pack (200) are located inside the cabinet body (300); The liquid cooling pipeline (400) is communicated with the liquid cooling plate of the power conversion device (100) and the liquid cooling plate of the battery pack (200).

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