Power conversion device with double-layer cavity sealing structure and energy storage system

Abstract

The utility model discloses a power conversion device with a double-layer cavity sealing structure and an energy storage system, and belongs to the technical field of liquid cooling. The device comprises a shell, a pipeline joint penetrating through the shell and a liquid cooling device in the shell, a joint seat of the pipeline joint is provided with a cavity with an opening in one end, the cavity is divided into a front cavity and a rear cavity by a first sealing plate, and the rear cavity is sealed by a second sealing plate; the front cavity is divided into a liquid inlet cavity and a liquid outlet cavity through a partition plate, and the wall of the connector base is provided with a liquid inlet connecting port and a liquid outlet connecting port which are communicated with the liquid inlet cavity and the liquid outlet cavity respectively. The first sealing plate is provided with first and second pipeline front interfaces, the second sealing plate is provided with first and second pipeline rear interfaces, and the liquid cooling device comprises a liquid inlet pipeline and a liquid outlet pipeline; the liquid inlet pipeline sequentially penetrates through and is welded to the first pipeline rear connector and the first pipeline front connector and communicates with the liquid inlet cavity. The liquid outlet pipeline sequentially penetrates through and is welded to the second pipeline rear connector and the second pipeline front connector and communicates with the liquid outlet cavity. According to the device, the liquid leakage probability of the pipeline connector under the welding failure condition is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid cooling, in particular to a power conversion device and an energy storage system with a double-layer cavity sealing structure. Background Art

[0002] In the new energy industry, an energy storage system includes a battery pack and a power conversion device. The battery pack is used to store electric energy and supply power to a load. The power conversion device includes a power supply module, which converts the electric energy output by the battery pack into direct current or alternating current required by the load. A large amount of heat is generated during the operation of the power supply module. Therefore, a liquid cooling module is also provided in the power conversion device to dissipate heat from the power supply device.

[0003] In the related art, the liquid cooling module includes a liquid cooling plate, a wind-liquid heat exchanger and a pipeline joint. The pipeline joint has a liquid inlet cavity and a liquid outlet cavity that are isolated from each other. The liquid cooling plate is connected to the liquid inlet cavity and the liquid outlet cavity respectively through a liquid cooling pipeline penetrating through the single-layer shell wall of the pipeline joint. The wind-liquid heat exchanger is connected to the liquid inlet cavity and the liquid outlet cavity respectively through a wind-liquid pipeline penetrating through the single-layer shell wall of the pipeline joint. In order to ensure that the liquid heat exchange medium, such as water, does not overflow from the connection between the shell wall and the pipeline, a welding method is usually used to form a weld between the pipeline and the shell wall to achieve water channel sealing.

[0004] Since the liquid inlet cavity and the liquid outlet cavity of the pipeline joint undertake the transfer operation of the liquid heat exchange medium, the weld is more likely to be impacted by the liquid heat exchange medium. Under the long-term frequent operation state, once the weld is eroded, the welding failure is likely to occur, resulting in liquid leakage of the pipeline joint. Summary of the Utility Model

[0005] The embodiments of the utility model provide a power conversion device and an energy storage system with a double-layer cavity sealing structure, which can solve the technical problems existing in the related art. Specifically, the technical solutions are as follows.

[0006] On the one hand, a power conversion device with a double-layer cavity sealing structure is provided. The power conversion device with the double-layer cavity sealing structure includes: a housing, a pipeline joint, and a liquid cooling device. The liquid cooling device is accommodated in the housing, and at least part of the pipeline joint penetrates the housing. The pipeline joint includes: a joint seat, a first sealing plate, and a second sealing plate; the joint seat has a chamber with an open end, the first sealing plate is located in the chamber and divides the chamber into a front chamber and a rear chamber that are sequentially distributed along a first direction, and the second sealing plate is located at the open end of the chamber to block the rear chamber; the front chamber is divided by a partition into a liquid inlet chamber and a liquid outlet chamber that are sequentially distributed along a second direction. The wall of the joint seat opposite to the first sealing plate has a liquid inlet connection port and a liquid outlet connection port. The liquid inlet connection port is communicated with the liquid inlet chamber, and the liquid outlet connection port is communicated with the liquid outlet chamber, where the second direction is perpendicular to the first direction; the first sealing plate has a first pipeline front interface and a second pipeline front interface, and the second sealing plate has a first pipeline rear interface and a second pipeline rear interface. The liquid cooling device includes a liquid inlet pipeline and a liquid outlet pipeline; the liquid inlet pipeline sequentially penetrates and is welded to the first pipeline rear interface and the first pipeline front interface, and is communicated with the liquid inlet chamber; the liquid outlet pipeline sequentially penetrates and is welded to the second pipeline rear interface and the second pipeline front interface, and is communicated with the liquid outlet chamber.

[0007] The power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present utility model divides the cavity of the joint seat into a front cavity and a rear cavity distributed in sequence along the first direction by arranging a first sealing plate and a second sealing plate in the pipeline joint. An inlet liquid cavity and an outlet liquid cavity are arranged in the front cavity to transfer the liquid heat exchange medium, and the rear cavity is used as a spare cavity to provide double protection. At the same time, the inlet pipelines of the liquid cooling device are respectively welded to the first sealing plate and the second sealing plate, so as to achieve weld sealing at the connection, and the outlet pipelines of the liquid cooling device are respectively welded to the first sealing plate and the second sealing plate, so as to achieve weld sealing at the connection. It can be seen that the power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present utility model is provided with a double-layer sealed cavity structure along the flowing direction of the liquid heat exchange medium, and a front weld is formed between the first sealing plate and the pipeline, and a rear weld is formed between the second sealing plate and the pipeline, that is, a double-layer weld is formed. Since the inlet liquid cavity and the outlet liquid cavity are arranged in the front cavity and are responsible for the transfer operation of the liquid heat exchange medium, the front weld corresponding to the front cavity is more likely to be impacted by the liquid heat exchange medium. Under the long-term frequent operation state, once the front weld is eroded and the welding fails, the front cavity will leak liquid into the rear cavity. During the normal operation of the front cavity, the liquid heat exchange medium does not enter the rear cavity, so that the rear weld is not impacted by the liquid heat exchange medium and always maintains stable sealing performance. Once the front weld fails and the front cavity leaks liquid into the rear cavity, due to the sealing performance of the rear weld between the second sealing plate and the pipeline, the leaked liquid will not overflow from the rear cavity to the outside of the pipeline joint, ensuring that the pipeline joint will not leak liquid. It can be seen that the power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present utility model effectively reduces the liquid leakage probability of the pipeline joint in the case of welding failure by setting a double-layer sealed cavity and using two layers of welds for sealing and protection, and improves the operation reliability of the power conversion device.

[0008] In some possible implementation manners, the power conversion device with a double-layer cavity sealing structure further includes: a support plate located inside the rear cavity, one end of the support plate abuts against the first sealing plate, and the other end of the support plate abuts against the second sealing plate; the support plate has a first pipeline through-hole and a second pipeline through-hole, the inlet pipeline penetrates through the first pipeline through-hole, and the outlet pipeline penetrates through the second pipeline through-hole. By arranging the support plate to support the first sealing plate and the second sealing plate, the deformation of the sealing plate is prevented, and the structural stability of the pipeline joint is improved.

[0009] In some possible implementation manners, the inlet pipeline is welded to the first pipeline through-hole, and the outlet pipeline is welded to the second pipeline through-hole.

[0010] In some possible implementation manners, an annular step is provided on the inner wall of the chamber, and the peripheral side of the surface of the first sealing plate facing away from the second sealing plate is connected to the annular step; the support plate includes: a plate body having the first pipeline through-hole and the second pipeline through-hole, and a frame body surrounding the outside of the plate body, one end of the frame body is connected to the peripheral side of the surface of the first sealing plate facing the second sealing plate, and the other end of the frame body is connected to the peripheral side of the surface of the second sealing plate facing the first sealing plate.

[0011] In some possible implementation manners, a plurality of first support ribs are provided in the front chamber, a plurality of second support ribs are provided on the surface of the plate body facing the first sealing plate, and a plurality of third support ribs are provided on the surface of the plate body facing the second sealing plate; the plurality of first support ribs and the plurality of second support ribs are respectively abutted against the two side surfaces of the first sealing plate; the plurality of third support ribs are abutted against one side surface of the second sealing plate.

[0012] In some possible implementation manners, the joint seat includes: a guide post, a test hole, and a seal; one end of the guide post is connected to the inner wall of the joint seat facing the first sealing plate, and the other end of the guide post is connected to the first sealing plate; the test hole sequentially penetrates through the wall of the joint seat facing the first sealing plate, the guide post, and the first sealing plate, so that both ends of the test hole are respectively communicated with the rear chamber and the outside of the joint seat; the seal is detachably connected to the test hole to seal the test hole.

[0013] In some possible implementation manners, a positioning structure is provided on the outer surface of the joint seat, and the positioning structure is used for the assembly positioning of the pipeline joint.

[0014] In some possible implementation manners, the power conversion device with a double-layer cavity sealing structure further includes two plugs, and the two plugs are respectively detachably connected to the liquid inlet connection port and the liquid outlet connection port.

[0015] In some possible implementation manners, the liquid cooling device includes: a liquid cooling plate and a liquid-air heat exchanger; the first pipeline front interfaces and the second pipeline front interfaces are provided in two groups, one group of the first pipeline front interfaces and the second pipeline front interfaces are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline of the liquid cooling plate, and the other group of the first pipeline front interfaces and the second pipeline front interfaces are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline of the liquid-air heat exchanger; the first pipeline rear interfaces and the second pipeline rear interfaces are provided in two groups, one group of the first pipeline rear interfaces and the second pipeline rear interfaces are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline of the liquid cooling plate, and the other group of the first pipeline rear interfaces and the second pipeline rear interfaces are respectively connected to the liquid inlet pipeline and the liquid outlet pipeline of the liquid-air heat exchanger.

[0016] On the other hand, an energy storage system is provided. The energy storage system includes a battery pack, a power conversion device, and a cooling device. The power conversion device is the power conversion device with a double-layer cavity sealing structure as described in any one of the above; the power conversion device is used to perform power conversion on the battery pack, and the cooling device is connected to the liquid inlet connection port and the liquid outlet connection port of the power conversion device. Description of the Drawings

[0017] Figure 1 It is a partial structural schematic diagram of the power conversion device with a double-layer cavity sealing structure provided by an embodiment of the present invention;

[0018] Figure 2 It is an exploded view of an exemplary pipeline joint provided by an embodiment of the present invention;

[0019] Figure 3 It is a structural schematic diagram of a joint seat provided by an embodiment of the present invention;

[0020] Figure 4 It is a sectional view of an exemplary pipeline joint provided by an embodiment of the present invention;

[0021] Figure 5 It is another partial structural schematic diagram of the power conversion device with a double-layer cavity sealing structure provided by an embodiment of the present invention;

[0022] Figure 6 It is a sectional view of another exemplary pipeline joint provided by an embodiment of the present invention;

[0023] Figure 7 It is an exploded view of another exemplary pipeline joint provided by an embodiment of the present invention;

[0024] Figure 8 It is still another partial structural schematic diagram of the power conversion device with a double-layer cavity sealing structure provided by an embodiment of the present invention;

[0025] Figure 9 It is a structural schematic diagram of an exemplary support plate provided by an embodiment of the present invention;

[0026] Figure 10 It is another sectional view of another exemplary pipeline joint provided by an embodiment of the present invention;

[0027] Figure 11 It is a partial exploded view of an exemplary pipeline joint provided by an embodiment of the present invention;

[0028] Figure 12 provided by an embodiment of the present invention Figure 11 Combined diagram of the pipeline joint shown;

[0029] Figure 13 A cross-sectional view from a top-down perspective of a power conversion device with a double-layer cavity sealing structure provided by an embodiment of the present utility model;

[0030] Figure 14 A schematic structural diagram of an energy storage system provided by an embodiment of the present utility model.

[0031] The reference numerals respectively represent:

[0032] 100, pipeline joint;

[0033] 11, joint seat; 110, chamber; 1101, front chamber; 11011, liquid inlet chamber; 11012, liquid outlet chamber; 11013, partition; 1102, rear chamber; 1103, annular step; 1104, first support rib; 1105, guide post; 1106, test hole; 1107, seal; 1108, positioning structure;

[0034] 111, liquid inlet connection port; 112, liquid outlet connection port;

[0035] 12, first sealing plate; 121, first pipeline front interface; 122, second pipeline front interface;

[0036] 13, second sealing plate; 131, first pipeline rear interface; 132, second pipeline rear interface;

[0037] 14, support plate; 141, first pipeline through hole; 142, second pipeline through hole; 1401, plate body; 1402, frame body; 1403, second support rib;

[0038] 15, plug;

[0039] 200, liquid cooling device; 201, liquid inlet pipeline; 202, liquid outlet pipeline;

[0040] 2001, liquid cooling plate; 2002, air-liquid heat exchanger;

[0041] 300, housing;

[0042] 001, battery pack; 002, power conversion device; 0021, power supply module; 0022, liquid cooling module; 003, cooling device. Detailed implementation manners

[0043] In the related art, a pipeline joint is formed by a single-layer shell wall enclosing a liquid inlet cavity and a liquid outlet cavity, that is, both the liquid inlet cavity and the liquid outlet cavity are designed with single cavities. There are through holes on the single-layer shell wall. The liquid cooling pipeline and the liquid-air pipeline respectively penetrate through their corresponding through holes, and the connection between the pipeline and the through hole is realized by welding. Thus, a single-layer weld seam is formed between the pipeline and the through hole. However, once the single-layer weld seam fails, the risk of liquid leakage in the pipeline joint increases accordingly.

[0044] In view of the technical problems existing in the related art, an embodiment of the present invention provides a power conversion device with a double-layer cavity sealing structure, as shown in the attached Figure 1 and the attached Figure 13 figures. The power conversion device with the double-layer cavity sealing structure includes: a pipeline joint 100, a liquid cooling device 200, and a housing 300. As shown in the attached Figure 13 figures, the liquid cooling device 200 is accommodated in the housing 300, and at least part of the pipeline joint 100 penetrates through the housing 300. Further as shown in the attached Figure 2 figures, the pipeline joint 100 includes: a joint seat 11, a first sealing plate 12, and a second sealing plate 13. Among them, as shown in the attached Figure 3 figures, the joint seat 11 has a chamber 110 with an open end. Further combined with Figure 4 , the first sealing plate 12 is located in the chamber 110 and divides the chamber 110 into a front chamber 1101 and a rear chamber 1102 that are sequentially distributed along a first direction. The second sealing plate 13 is located at the open end of the chamber 110 to block the rear chamber 1102. The front chamber 1101 is divided by a partition 11013 into a liquid inlet cavity 11011 and a liquid outlet cavity 11012 that are sequentially distributed along a second direction. The wall of the joint seat 11 opposite to the first sealing plate 12 has a liquid inlet connection port 111 and a liquid outlet connection port 112. The liquid inlet connection port 111 is communicated with the liquid inlet cavity 11011, and the liquid outlet connection port 112 is communicated with the liquid outlet cavity 11012, where the second direction is perpendicular to the first direction.

[0045] The first sealing plate 12 has a first pipeline front interface 121 and a second pipeline front interface 122, and the second sealing plate 13 has a first pipeline rear interface 131 and a second pipeline rear interface 132. The liquid cooling device 200 includes a liquid inlet pipeline 201 and a liquid outlet pipeline 202. Further combined with Figure 5 it can be known that the liquid inlet pipeline 201 sequentially penetrates through and is welded to the first pipeline rear interface 131 and the first pipeline front interface 121, and is communicated with the liquid inlet cavity 11011; the liquid outlet pipeline 202 sequentially penetrates through and is welded to the second pipeline rear interface 132 and the second pipeline front interface 122, and is communicated with the liquid outlet cavity 11012.

[0046] The power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present utility model can be applied to an energy storage system. The energy storage system includes a battery pack 001, a power conversion device 002, and a cooling device 003. Refer to Figure 14 , the power conversion device 002 includes a power supply module 0021 and a liquid cooling module 0022. The power supply module 0021 converts the electric energy output by the battery pack 001 into direct current or alternating current required by the load. A large amount of heat is generated during the operation of the power supply module 0021, and the liquid cooling module 0022 dissipates heat from the power supply module 0021. The power conversion device with a double-layer cavity sealing structure involved in the embodiment of the present utility model mainly elaborates on the layout of the liquid cooling module 0022. That is to say, the pipeline joint 100 and the liquid cooling device 200 involved above are included in the liquid cooling module 0022.

[0047] The cooling device 003 involved in the energy storage system refers to a device that provides a cooling medium for the liquid cooling module 0022. For example, the cooling device 003 includes a pump, and the cooling medium is pumped into the liquid cooling module 0022 through the pump for circulation. For example, when the cooling medium is water, the cooling device 003 can also be called a chiller or a liquid cooling unit. The pipeline joint 100 at least partially penetrates the housing 300, allowing the liquid inlet connection port 111 and the liquid outlet connection port 112 thereon to be exposed outside the housing 300, thus facilitating the connection with the cooling device 003.

[0048] As shown in the appendix Figure 1 , the liquid inlet connection port 111 and the liquid outlet connection port 112 of the power conversion device are connected to the cooling device 003. The power supply module 0021 converts the electric energy output by the battery pack 001 into direct current or alternating current required by the load. A large amount of heat is generated during the operation of the power supply module 0021, and the liquid cooling module 0022 dissipates heat from the power supply module 0021. During application, after the liquid cooling device 200 in the power conversion device performs heat exchange on the power supply module 0021, the temperature of the circulating liquid heat exchange medium therein rises to form a high-temperature heat exchange medium. The high-temperature heat exchange medium, such as hot water, sequentially passes through the liquid outlet pipeline 202, the liquid outlet cavity 11012 of the pipeline joint 100, and the liquid outlet connection port 112, and then enters the cooling device 003 for cooling to form a low-temperature heat exchange medium. The low-temperature heat exchange medium, such as cold water, sequentially passes through the liquid inlet connection port 111, the liquid inlet cavity 11011 of the pipeline joint 100, and the liquid inlet pipeline 201, and then enters the liquid cooling device 200 for the next round of heat exchange operation.

[0049] In view of the problem of relatively high risk of liquid leakage caused by welding failure of the pipeline joint 100 in the related art, the power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present utility model divides the cavity 110 of the joint seat 11 into a front cavity 1101 and a rear cavity 1102 which are sequentially distributed along the first direction by arranging a first sealing plate 12 and a second sealing plate 13 in the pipeline joint 100. An inlet liquid cavity 11011 and an outlet liquid cavity 11012 are arranged in the front cavity 1101 to transfer the liquid heat exchange medium, and the rear cavity 1102 serves as a standby cavity 110 to provide double protection. At the same time, the inlet liquid pipeline 201 of the liquid cooling device 200 is respectively welded to the first sealing plate 12 and the second sealing plate 13, so as to achieve weld sealing at the connection, and the outlet liquid pipeline 202 of the liquid cooling device 200 is respectively welded to the first sealing plate 12 and the second sealing plate 13, so as to achieve weld sealing at the connection.

[0050] It can be seen that the power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present utility model is provided with a double-layer sealed cavity structure along the flowing direction of the liquid heat exchange medium. Moreover, a front weld is formed between the first sealing plate 12 and the pipeline, and a rear weld is formed between the second sealing plate 13 and the pipeline, that is, a double-layer weld is formed. Since the inlet liquid cavity 11011 and the outlet liquid cavity 11012 are arranged in the front cavity 1101 and the front cavity 1101 undertakes the transfer operation of the liquid heat exchange medium, the front weld corresponding to the front cavity 1101 is more likely to be impacted by the liquid heat exchange medium. Under the long-term frequent operation state, once the front weld is eroded and welding failure occurs, the front cavity 1101 will leak liquid to the rear cavity 1102. During the normal operation of the front cavity 1101, the liquid heat exchange medium does not enter the rear cavity 1102, so that the rear weld is not impacted by the liquid heat exchange medium and always maintains stable sealing performance. Once the front weld fails and the front cavity 1101 leaks liquid to the rear cavity 1102, due to the sealing performance of the rear weld between the second sealing plate 13 and the pipeline, the leaked liquid will not overflow from the rear cavity 1102 to the outside of the pipeline joint 100, ensuring that the pipeline joint 100 will not leak liquid. To sum up, the power conversion device provided by the embodiment of the present utility model effectively reduces the liquid leakage probability of the pipeline joint 100 in the case of welding failure and improves the operation reliability of the power conversion device by arranging a double-layer sealed cavity and using two layers of welds for sealing and protection.

[0051] As can be seen above, in the pipeline joint 100, the chamber 110 of the joint seat 11 is divided into a front chamber 1101 and a rear chamber 1102. The joint seat 11 and the first sealing plate 12 form the front chamber 1101 and form the first welding seal. The first sealing plate 12 and the second sealing plate 13 form the rear chamber 1102 and form the second welding seal, constituting a double-chamber sealing protection structure. The two welding seals provide protection, reduce the failure probability, improve the long-term application reliability of the product, reduce the risk of liquid leakage in the liquid cooling pipeline, and achieve intrinsic safety through redundant protection at the design end.

[0052] In the pipeline joint 100, the liquid inlet pipe 201 penetrates through the second sealing plate 13 and the first sealing plate 12 in a sealed manner and is connected to the liquid inlet chamber 11011. An exemplary implementation manner may be that one end of the liquid inlet pipe 201 sequentially penetrates through the first pipeline rear interface 131 and the first pipeline front interface 121 and extends into the liquid inlet chamber 11011. Moreover, the liquid inlet pipe 201 is hermetically connected to the first pipeline rear interface 131 and the first pipeline front interface 121 through a weld. The liquid outlet pipe 202 penetrates through the second sealing plate 13 and the first sealing plate 12 in a sealed manner and is connected to the liquid outlet chamber 11012. An exemplary implementation manner may be that one end of the liquid outlet pipe 202 sequentially penetrates through the second pipeline rear interface 132 and the second pipeline front interface 122 and extends into the liquid outlet chamber 11012. The liquid outlet pipe 202 is hermetically connected to the second pipeline rear interface 132 and the second pipeline front interface 122 through a weld.

[0053] Among them, the shapes of the first pipeline rear interface 131 and the first pipeline front interface 121 can be adaptively designed according to the shape of the liquid inlet pipe 201. For example, when the liquid inlet pipe 201 is a flat pipe, both the first pipeline rear interface 131 and the first pipeline front interface 121 can be designed as long strips adapted to the flat pipe. Similarly, the shapes of the second pipeline rear interface 132 and the second pipeline front interface 122 can be adaptively designed according to the shape of the liquid outlet pipe 202. For example, when the liquid outlet pipe 202 is a flat pipe, both the first pipeline rear interface 131 and the first pipeline front interface 121 can be designed as long strips adapted to the flat pipe.

[0054] In the embodiment of the present invention, the volume of the front chamber 1101 can be made larger than the volume of the rear chamber 1102. The larger volume of the front chamber 1101 is beneficial for making the volumes of the liquid inlet chamber 11011 and the liquid outlet chamber 11012 larger, and the operation reliability of the pipeline joint 100 is stronger. The rear chamber 1102, as a standby chamber 110 that plays a role in sealing protection, mainly plays a role in leak prevention. As the second line of defense, by making the volume of the rear chamber 1102 smaller, on the basis of meeting its function, it is also beneficial for reducing the volume of the pipeline joint 100.

[0055] The brazing process is usually used to achieve the welded connection between components such as the joint base 11, the first sealing plate 12, the second sealing plate 13, the liquid inlet pipe 201, and the liquid outlet pipe 202. During the brazing process, it is usually necessary to use a tooling to clamp the pipeline joint 100 to ensure close contact between the components, thereby improving the welding reliability. Since the first sealing plate 12 and the second sealing plate 13 are arranged at intervals, when using the tooling to clamp, once the clamping force is too large, problems such as deformation of the sealing plate are likely to occur. The deformation of the sealing plate is more likely to cause the weld to twist, resulting in welding failure.

[0056] In view of the above technical problems, as shown in the attached Figure 6 - attached Figure 8 As shown in the figure, the power conversion device with a double-layer cavity sealing structure provided by the embodiment of the present invention further includes: a support plate 14 located inside the rear chamber 1102, one end of the support plate 14 abuts against the first sealing plate 12, the other end of the support plate 14 abuts against the second sealing plate 13, the support plate 14 has a first pipe through hole 141 and a second pipe through hole 142, the liquid inlet pipe 201 passes through the first pipe through hole 141, and the liquid outlet pipe 202 passes through the second pipe through hole 142.

[0057] By providing the support plate 14 to support the first sealing plate 12 and the second sealing plate 13, the deformation of the sealing plate is prevented, and the structural stability of the pipeline joint 100 is improved.

[0058] Wherein, the support plate 14 has a first pipe through hole 141 for the liquid inlet pipe 201 to pass through, and the support plate 14 has a second pipe through hole 142 for the liquid outlet pipe 202 to pass through. The pipe through hole and the corresponding pipe can be a simple clearance fit or further connected to enhance the connection stability.

[0059] In some examples, the liquid inlet pipe 201 is welded to the first pipe through hole 141, and the liquid outlet pipe 202 is welded to the second pipe through hole 142. Thus, the liquid inlet pipe 201 and the first pipe through hole 141 are hermetically connected through the weld, and the liquid outlet pipe 202 and the second pipe through hole 142 are hermetically connected through the weld. In this way, through the brazing process involved above, the welded connection between the first sealing plate 12, the second sealing plate 13, the support plate 14 and the corresponding pipes can be achieved in one step.

[0060] Combined with any of the above-mentioned power conversion devices with a double-layer cavity sealing structure, the structure, arrangement method, etc. of the joint base 11, the first sealing plate 12, the second sealing plate 13 and the support plate 14 will be further exemplarily described below.

[0061] For the support base, as shown in the attached Figure 3As shown, the support base is in the shape of a cover body with one end open. A chamber 110 is formed inside the support base, and the open end of the chamber 110 is also the open end of the support base. On the wall of the support base on the side opposite to its open end, a liquid inlet connection port 111 and a liquid outlet connection port 112 are provided. The liquid inlet connection port 111 communicates with the liquid inlet chamber 11011 of the support base, and the liquid outlet connection port 112 communicates with the liquid inlet chamber 11011 of the support base.

[0062] For the first sealing plate 12 and the second sealing plate 13, both can be in a flat plate shape, and the first sealing plate 12 and the second sealing plate 13 can both be connected to the corresponding positions of the joint seat 11 by welding.

[0063] As shown in the appendix Figure 2 As shown, the first sealing plate 12 has a first pipeline front interface 121 and a second pipeline front interface 122. In order to increase the contact area between the front interface and the pipeline, that is, to increase the weld area and improve the sealing effect, the first pipeline front interface 121 and the second pipeline front interface 122 can extend outward to any one side surface of the first sealing plate 12, forming an extended interface in the shape of an annular boss on the corresponding surface of the first sealing plate 12. Similarly, the second sealing plate 13 has a first pipeline rear interface 131 and a second pipeline rear interface 132. In order to increase the contact area between the rear interface and the pipeline, that is, to increase the weld area and improve the sealing effect, the first pipeline rear interface 131 and the second pipeline rear interface 132 can extend outward to any one side surface of the second sealing plate 13, forming an extended interface in the shape of an annular boss on the corresponding surface of the second sealing plate 13.

[0064] In some examples, as shown in the appendix Figure 3 As shown, an annular step 1103 is provided on the inner wall of the chamber 110, and the circumferential side of the surface of the first sealing plate 12 facing away from the second sealing plate 13 is connected to the annular step 1103; as shown in the appendix Figure 6 and the appendix Figure 7 As shown, the support plate 14 includes: a plate body 1401 having a first pipeline through port 141 and a second pipeline through port 142, and a frame body 1402 surrounding the outside of the plate body 1401. One end of the frame body 1402 is connected to the circumferential side of the surface of the first sealing plate 12 facing the second sealing plate 13, and the other end of the frame body 1402 is connected to the circumferential side of the surface of the second sealing plate 13 facing the first sealing plate 12.

[0065] During the assembly stage of the pipeline joint 100, both ends of the circumferential side of the first sealing plate 12 are abutted and pressed by the annular step 1103 and the frame 1402 of the support plate 14, so as to realize the preliminary fixation of the first sealing plate 12 inside the support seat. It should be noted that the surface of the first sealing plate 12 facing away from the second sealing plate 13 is also in close contact with the partition inside the joint seat 11, so as to ensure that the liquid inlet cavity 11011 and the liquid outlet cavity 11012 inside the front chamber 1101 can be isolated from each other during welding. After the stable assembly of each component, the welding connection of each contact part can be realized through the welding process.

[0066] By setting the support plate 14 to include a frame 1402 and a plate body 1401, and the dimension of the frame 1402 along the first direction is greater than the dimension of the plate body 1401 along the first direction, the plate body 1401 can be arranged inside the frame 1402. On the basis of the support plate 14 supporting the sealing plate, a gap is also allowed between the plate body 1401 of the support plate 14 and at least one of the first sealing plate 12 and the second sealing plate 13 to serve as the rear chamber 1102.

[0067] In some examples, one end of the frame 1402 of the support plate 14 facing the second sealing plate 13 is flush with the open end of the joint seat 11. During the assembly stage of the pipeline joint 100, the second sealing plate 13 abuts against both the frame 1402 of the support plate 14 and the open end of the joint seat 11 at the same time. Subsequently, the second sealing plate 13 can be further fixedly connected to the frame 1402 of the support plate 14 and the open end of the joint seat 11 by welding or other connection methods.

[0068] To further improve the supporting effect of the support plate 14 on the first sealing plate 12 and the second sealing plate 13, as shown in the appendix Figure 3 As shown, there are a plurality of first support ribs 1104 in the front chamber 1101. As shown in the appendix Figure 9 As shown, the surface of the plate body 1401 facing the first sealing plate 12 has a plurality of second support ribs 1403. The plurality of first support ribs 1104 and the plurality of second support ribs 1403 respectively abut against both side surfaces of the first sealing plate 12. Further, the surface of the plate body 1401 facing the second sealing plate 13 has a plurality of third support ribs (not shown in the figure), and the plurality of third support ribs abut against one side surface of the second sealing plate 13.

[0069] Among them, one end of the first support rib 1104 is connected to the inner wall of the joint seat 11 facing its open end, and the other end of the first support rib 1104 abuts against the first sealing plate 12. The first support rib 1104, the second support rib 1403 and the third support rib can all be arranged as a plurality of spaced-apart ones, so as to be evenly distributed on the entire surfaces of the first sealing plate 12 and the second sealing plate 13 as much as possible.

[0070] By using a plurality of supporting ribs to support the first closing plate 12 and the second closing plate 13 , the supporting effect is improved and the area occupied by the front chamber 1101 and the rear chamber 1102 is reduced.

[0071] In some examples, the positions of multiple first support ribs 1104 and multiple second support ribs 1403 correspond one to one, and the corresponding first support ribs 1104 and second support ribs 1403 can support the two side surfaces of the first sealing plate 12 at the same position, so that the first sealing plate 12 is subjected to balanced force, which is more beneficial for preventing the first sealing plate 12 from deforming.

[0072] The first support rib 1104 and the second support rib 1403 can both be in the form of convex ribs and arranged protrudingly, for example, the second support rib 1403 is arranged protrudingly on the corresponding surface of the plate body 1401 of the support plate 14. The arrangement of the third support rib can refer to the second support rib 1403, and further, part of the surface of the plate body 1401 of the support plate 14 can also be used as the third support rib.

[0073] Since the rear chamber 1102 is an independent closed chamber 110 relative to the front chamber 1101, the airtightness test of the front chamber 1101 can be operated through the liquid inlet connection port 111 and the liquid outlet connection port 112 on the connector seat 11, while the airtightness test of the rear chamber 1102 requires a separate arrangement of the test hole 1106.

[0074] Regarding the above technical issues, as shown in the attached Figure 3 , Figure 10 and Figure 11 As shown, the embodiment of the utility model makes the connector seat 11 include: a guide column 1105, a test hole 1106 and a sealing member 1107, one end of the guide column 1105 is connected to the inner wall of the connector seat 11 facing the first sealing plate 12, and the other end of the guide column 1105 is connected to the first sealing plate 12; the test hole 1106 sequentially penetrates the wall of the connector seat 11 facing the first sealing plate 12, the guide column 1105 and the first sealing plate 12, so that the two ends of the test hole 1106 are respectively connected to the rear chamber 1102 and the outside of the connector seat 11; the sealing member 1107 is detachably connected to the test hole 1106 to seal the test hole 1106.

[0075] By setting up the guide column 1105 and opening the test hole 1106 on this basis, the test hole 1106 can directly reach the rear chamber 1102 from the front end outer wall of the connector seat 11, so as to perform a separate airtightness test on the rear chamber 1102 to meet the backup sealing protection after the sealing of the front chamber 1101 fails.

[0076] By detachably connecting the seal 1107 to the test hole 1106, the structure of the test hole 1106 can be adaptively designed according to the structure of the seal 1107. When it is necessary to perform a tightness test on the rear chamber 1102 through the test hole 1106, the seal 1107 is removed from the test hole 1106. When the tightness test is not being performed, the seal 1107 is assembled to the test hole 1106 to seal it, ensuring the tightness of the rear chamber 1102.

[0077] Exemplarily, the seal 1107 can be a waterproof sealing screw, thereby enhancing the sealing effect between the seal 1107 and the test hole 1106.

[0078] In some examples, the joint seat 11 provided in the embodiment of the present invention is an integral structure. After assembling each component therein, the assembled structure is processed by brazing, so that the contact positions of the components are welded together, thereby obtaining the joint seat 11 with an integral structure.

[0079] In some examples, as shown in the attached Figure 11 figure, the outer surface of the joint seat 11 has a positioning structure 1108. The positioning structure 1108 is used for the assembly positioning of the pipeline joint 100. The positioning structure 1108 can be in the form of a hole (for example, Figure 11 it is illustrated that the positioning structure 1108 is a blind hole, and the two positioning structures 1108 are arranged diagonally), or it can be in the form of a convex column. In this way, when the pipeline joint 100 is assembled to the housing of the power conversion device 002, based on the positioning structure 1108, the correction and fixation positioning of the pipeline joint 100 are assisted to achieve its accurate and efficient assembly.

[0080] For example, as shown in the attached Figure 11 figure, the positioning structure 1108, the liquid inlet connection port 111, and the liquid outlet connection port 112 can be all arranged on the same side surface of the joint seat 11.

[0081] In some examples, as shown in the attached Figure 11 - attached Figure 12 figure, the power conversion device with a double-layer cavity sealing structure provided in the embodiment of the present invention further includes two plugs 15. The two plugs 15 are respectively detachably connected to the liquid inlet connection port 111 and the liquid outlet connection port 112. For example, the plug 15 can be a rubber plug. When the power conversion device is stored separately, the plugs 15 can be used to block the liquid inlet connection port 111 and the liquid outlet connection port 112 on the joint seat 11 to prevent impurities from invading. When the power conversion device needs to be connected to the cooling device 003 of the energy storage system, the plugs 15 can be removed.

[0082] Combined with any of the power conversion devices involved in the above embodiments of the present disclosure, the liquid cooling device 200 can be arranged as one or multiple different ones. When the liquid cooling device 200 is arranged as multiple ones, the number of the front interfaces on the first sealing plate 12, the rear interfaces on the second sealing plate 13, and the pipeline through holes on the support plate 14 can be adaptively designed according to the number of the liquid cooling devices 200.

[0083] There are usually various types of power modules 0021 in the power conversion device 002. Some power modules 0021 generate a large amount of heat (for example, power tubes, etc.), and some power modules 0021 generate a small amount of heat (for example, capacitors, relays, transformers, surge arresters, etc.). For power modules 0021 with different heat generation amounts, different liquid cooling devices 200 can be adopted. For example, as shown in the appendix Figure 1 It can be seen that the liquid cooling device 200 can include a liquid cooling plate 2001 and a liquid-air heat exchanger 2002.

[0084] The liquid cooling plate 2001 is used to dissipate heat from the power module 0021 with high heat generation, and can meet the heat dissipation requirements of the power module 0021 with high heat generation. A liquid heat exchange medium flows in the liquid cooling plate 2001, and the liquid cooling plate 2001 is attached to the corresponding power module 0021, such as a power tube, etc., for heat exchange.

[0085] The liquid-air heat exchanger 2002 is used to dissipate heat from the power module 0021 with low heat generation. A liquid heat exchange medium flows in the liquid-air heat exchanger 2002, and the liquid heat exchange medium in the liquid-air heat exchanger 2002 can exchange heat with the air in the housing of the power conversion device 002. When the air with a lower temperature flows through the heating power module 0021, it can cool the power module 0021.

[0086] For the case where the liquid cooling device 200 includes a liquid cooling plate 2001 and a liquid-air heat exchanger 2002, as shown in the appendix Figure 2 and the appendix Figure 5 It can be seen that the first pipeline front interfaces 121 and the second pipeline front interfaces 122 on the first sealing plate 12 are set in two groups. One group of the first pipeline front interfaces 121 and the second pipeline front interfaces 122 are respectively connected to the liquid inlet pipeline 201 and the liquid outlet pipeline 202 of the liquid cooling plate 2001, and the other group of the first pipeline front interfaces 121 and the second pipeline front interfaces 122 are respectively connected to the liquid inlet pipeline 201 and the liquid outlet pipeline 202 of the liquid-air heat exchanger 2002.

[0087] As shown in the appendix Figure 2 and the appendix Figure 5As shown in the figure, the first pipeline rear interfaces 131 and the second pipeline rear interfaces 132 on the second sealing plate 13 are arranged in two groups. One group of the first pipeline rear interfaces 131 and the second pipeline rear interfaces 132 are respectively connected to the liquid inlet pipeline 201 and the liquid outlet pipeline 202 of the liquid cooling plate 2001, and the other group of the first pipeline rear interfaces 131 and the second pipeline rear interfaces 132 are respectively connected to the liquid inlet pipeline 201 and the liquid outlet pipeline 202 of the air-liquid heat exchanger 2002.

[0088] It can be seen that the power conversion device with a double-layer cavity sealing structure provided by the present utility model dissipates heat from the power conversion device 002 through a composite heat dissipation system combining the liquid cooling plate 2001 and the air-liquid heat exchanger 2002, which not only has a good heat dissipation effect, but also helps to reduce the heat dissipation energy consumption and miniaturization of the power conversion device 002. In addition, the liquid cooling plate 2001 and the air-liquid heat exchanger 2002 are connected to the same pipeline joint 100 and receive and discharge the liquid heat exchange medium through the same pipeline joint 100, reducing the number of pipeline joints 100 and making the structure of the power conversion device with a double-layer cavity sealing structure more compact.

[0089] In some examples, one group of the first pipeline front interfaces 121 and the second pipeline front interfaces 122 and the other group of the first pipeline front interfaces 121 and the second pipeline front interfaces 122 can be arranged at intervals in the third direction, where the third direction is perpendicular to the plane formed by the first direction and the second direction. In this way, it is beneficial to realize the compact assembly of multiple pipelines on the pipeline joint 100.

[0090] On the other hand, the embodiment of the present utility model also provides an energy storage system, as shown in the appendix Figure 14 As shown in the figure, the energy storage system includes a battery pack 001, a power conversion device 002, and a cooling device 003. The power conversion device 002 is any one of the power conversion devices 002 with a double-layer cavity sealing structure as described above. The power conversion device 002 is used to perform power conversion on the battery pack 001. The cooling device 003 is connected to the liquid inlet connection port 111 and the liquid outlet connection port 112 of the power conversion device 002 with a double-layer cavity sealing structure.

[0091] The energy storage system provided by the embodiment of the present utility model has all the advantages of the power conversion device 002 with a double-layer cavity sealing structure provided by the embodiment of the present utility model.

[0092] Among them, the cooling device 003 refers to a device that provides a cooling medium for the liquid cooling module 0022. For example, the cooling device 003 includes a pump, and the cooling medium is pumped into the liquid cooling module 0022 through the pump for circulation. For example, when the cooling medium is water, the cooling device 003 can also be called a chiller or a liquid cooling unit. The cooling device 003 can be connected to the liquid inlet connection port 111 and the liquid outlet connection port 112 of the power conversion device 002 with a double-layer cavity sealing structure through two joints or pipelines, and can be selected according to actual needs.

[0093] Further as shown in the appendix Figure 14 As shown, the power conversion device 002 includes a power supply module 0021 and a liquid cooling module 0022. The pipeline joint 100 and the liquid cooling device 200 are included in the liquid cooling module 0022. The power supply module 0021 is electrically connected to the battery pack 001, and the liquid cooling module 0022 dissipates heat from the power supply module 0021.

[0094] For the energy storage system involved in the embodiment of the present invention, the battery pack 001 is used to store electrical energy and supply power to the load. The power supply module 0021 of the power conversion device 002 is a module that can implement the power conversion function. The power supply module 0021 can implement at least one of the functions of DC (Direct Current) - DC conversion, AC (Alternating Current) - AC conversion, AC - DC conversion, and DC - AC conversion. Exemplarily, the power supply module 0021 includes, but is not limited to, devices such as inverters and other power conversion devices, so as to convert the electrical energy output by the battery pack 001 into direct current or alternating current required by the load.

[0095] The above is only for the convenience of those skilled in the art to understand the technical solutions of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A power conversion device with a double-layer cavity sealing structure, characterized in that: The power conversion device comprises: a housing (300), a pipe joint (100) and a liquid cooling device (200); the liquid cooling device (200) is accommodated in the housing (300); at least a portion of the pipe joint (100) passes through the housing (300); the pipe joint (100) comprises: a joint seat (11), a first sealing plate (12) and a second sealing plate (13); The connector seat (11) has a chamber (110) with an opening at one end, the first sealing plate (12) is located in the chamber (110) and divides the chamber (110) into a front chamber (1101) and a rear chamber (1102) which are sequentially distributed along a first direction, and the second sealing plate (13) is located at the open end of the chamber (110) to seal the rear chamber (1102); The front chamber (1101) is divided by a partition (11013) into a liquid inlet chamber (11011) and a liquid outlet chamber (11012) distributed in sequence along a second direction; a liquid inlet connection port (111) and a liquid outlet connection port (112) are provided on a wall of the connector seat (11) opposite to the first sealing plate (12); the liquid inlet connection port (111) is connected to the liquid inlet chamber (11011), and the liquid outlet connection port (112) is connected to the liquid outlet chamber (11012), wherein the second direction is perpendicular to the first direction; The first sealing plate (12) has a first pipeline front interface (121) and a second pipeline front interface (122), the second sealing plate (13) has a first pipeline rear interface (131) and a second pipeline rear interface (132), and the liquid cooling device (200) comprises a liquid inlet pipeline (201) and a liquid outlet pipeline (202); The liquid inlet pipeline (201) sequentially penetrates and is welded to the first pipeline rear interface (131) and the first pipeline front interface (121), and is communicated with the liquid inlet cavity (11011); The liquid outlet pipe (202) passes through and is welded to the second pipeline rear interface (132) and the second pipeline front interface (122) in sequence, and is connected to the liquid outlet cavity (11012).

2. The power conversion device with a double-layer cavity sealing structure according to claim 1, characterized in that: The power conversion device further comprises: a support plate (14) located inside the rear chamber (1102), one end of the support plate (14) abutting against the first sealing plate (12), and the other end of the support plate (14) abutting against the second sealing plate (13); The support plate (14) has a first pipeline passage (141) and a second pipeline passage (142); the liquid inlet pipeline (201) passes through the first pipeline passage (141), and the liquid outlet pipeline (202) passes through the second pipeline passage (142).

3. The power conversion device with a double-layer cavity sealing structure according to claim 2, characterized in that: The liquid inlet pipe (201) is connected to the first pipeline outlet (141) by welding, and the liquid outlet pipe (202) is connected to the second pipeline outlet (142) by welding.

4. The power conversion device with a double-layer cavity sealing structure according to claim 2, characterized in that: An annular step (1103) is provided on the inner wall of the chamber (110), and a peripheral side of the surface of the first sealing plate (12) facing away from the second sealing plate (13) is connected to the annular step (1103); The support plate (14) includes: a plate body (1401) having the first pipeline outlet (141) and the second pipeline outlet (142) and a frame body (1402) arranged around the outside of the plate body (1401), one end of the frame body (1402) is connected to the surface of the first sealing plate (12) facing the second sealing plate (13), and the other end of the frame body (1402) is connected to the surface of the second sealing plate (13) facing the first sealing plate (12).

5. The power conversion device with a double-layer cavity sealing structure according to claim 4, characterized in that: The front chamber (1101) has a plurality of first supporting ribs (1104), and the surface of the plate body (1401) facing the first sealing plate (12) has a plurality of second supporting ribs (1403); The plurality of first supporting ribs (1104) and the plurality of second supporting ribs (1403) are respectively in contact with the two side surfaces of the first sealing plate (12).

6. The power conversion device with a double-layer cavity sealing structure according to claim 1, characterized in that: The joint seat (11) comprises: a guide column (1105), a test hole (1106) and a sealing member (1107), one end of the guide column (1105) being connected to an inner wall of the joint seat (11) facing the first sealing plate (12), and the other end of the guide column (1105) being connected to the first sealing plate (12); The test hole (1106) sequentially passes through the wall of the connector seat (11) facing the first sealing plate (12), the guide column (1105) and the first sealing plate (12), so that the two ends of the test hole (1106) are respectively connected to the rear chamber (1102) and the outside of the connector seat (11); The sealing member (1107) is detachably connected to the testing hole (1106) to seal the testing hole (1106).

7. The power conversion device with a double-layer cavity sealing structure according to claim 1, characterized in that: The outer surface of the connector seat (11) has a positioning structure (1108), and the positioning structure (1108) is used for assembly positioning of the pipe connector (100).

8. The power conversion device with a double-layer cavity sealing structure according to claim 1, characterized in that: The power conversion device further comprises two plugs (15), wherein the two plugs (15) are detachably connected to the liquid inlet connection port (111) and the liquid outlet connection port (112), respectively.

9. The power conversion device with a double-layer cavity sealing structure according to any one of claims 1 to 8, characterized in that: The liquid cooling device (200) comprises: a liquid cooling plate (2001) and an air-liquid heat exchanger (2002); The first pipeline front interface (121) and the second pipeline front interface (122) are arranged in two groups, one group of the first pipeline front interface (121) and the second pipeline front interface (122) are respectively connected to the liquid inlet pipeline (201) and the liquid outlet pipeline (202) of the liquid cooling plate (2001), and the other group of the first pipeline front interface (121) and the second pipeline front interface (122) are respectively connected to the liquid inlet pipeline (201) and the liquid outlet pipeline (202) of the air-liquid heat exchanger (2002); The first pipeline rear interface (131) and the second pipeline rear interface (132) are arranged in two groups, one group of the first pipeline rear interface (131) and the second pipeline rear interface (132) are respectively connected to the liquid inlet pipe (201) and the liquid outlet pipe (202) of the liquid cooling plate (2001), and the other group of the first pipeline rear interface (131) and the second pipeline rear interface (132) are respectively connected to the liquid inlet pipe (201) and the liquid outlet pipe (202) of the air-liquid heat exchanger (2002).

10. An energy storage system, characterized in that: The energy storage system comprises a battery pack (001), a power conversion device (002) and a cooling device (003), wherein the power conversion device (002) is a power conversion device with a double-layer cavity sealing structure as claimed in any one of claims 1 to 9; The power conversion device (002) is used to perform power conversion on the battery pack (001), and the cooling device (003) is connected to a liquid inlet connection port (111) and a liquid outlet connection port (112) of the power conversion device (002).

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