Split gradient pressure package maintainable power capacitor module

Abstract

The application relates to a capacitor module, in particular to a maintainable power capacitor module with split type gradient pressure packaging, which comprises a split type capacitor module, the split type capacitor module comprises a plurality of capacitors, the capacitors are packaged with 3D packaging integration technology, an intermediate gap is left between two adjacent capacitors, a connecting part is arranged on the capacitor, the connecting part is used for connecting the capacitors in series, and the capacitor module further comprises a water cooling part, an air cooling part, a base and a fixing part; the capacitors are packaged with 3D packaging integration technology, the water cooling part is arranged to dissipate heat from the inner and outer surfaces of the capacitors; the base and the fixing part form channels with the capacitors, and the channels are also formed between the adjacent capacitors, so that external air can enter the air cooling channel through the channels, and the air cooling part can dissipate heat from the side surface and the upper and lower surfaces of the capacitors.

Description

TECHNICAL FIELD

[0001] The present application relates to a capacitor module, in particular a maintainable power capacitor module with a split type gradient pressure package. BACKGROUND

[0002] A capacitor module is a modular device composed of multiple capacitor units through electrical and mechanical integration, widely used in power electronics, new energy, industrial automation and other fields, mainly for energy storage, filtering, reactive power compensation, voltage stabilization and other functions. Its design combines high-performance materials, intelligent control and advanced packaging technology to meet the needs of high power density, long life and easy maintenance. The maintainable power capacitor module with a split type gradient pressure package is a high-performance capacitor device designed for power system needs, combining split structure, 3D gradient pressure packaging technology and maintainability design, significantly improving the reliability of the capacitor, suitable for new energy power generation, flexible power transmission, industrial frequency conversion and other scenarios.

[0003] The split structure design is to divide the traditional single capacitor into multiple independent petal-shaped modules, which are combined into a complete module in parallel or series. When a single petal fails, the system can be maintained through redundancy design, improving fault tolerance.

[0004] Gradient pressure packaging uses a layered pressure packaging process to apply a gradient distribution of mechanical pressure between the internal dielectric and electrode, optimizing dielectric performance, suppressing partial discharge and extending insulation life.

[0005] A lithium ion capacitor module is disclosed in Chinese patent application No. CN201610645656.8. The end plate, sheet metal side plate, reinforcing plate and cover plate of the capacitor module are provided with multiple reinforcing ribs, and the bent part of the sheet metal side plate is provided with an angle support hole to improve the structural strength of the module and enhance the structural stability of the module. Multiple air ducts are provided inside the middle partition plate and on both sides of the end plate for convective cooling of the surface of the battery cell to improve the uneven temperature inside the module. However, this capacitor module relies solely on air ducts for cooling, which cannot accelerate the flow rate of air. Hot air is difficult to dissipate quickly in the air duct, and the capacitor module cannot be cooled in time, reducing the energy storage capacity of the capacitor module. SUMMARY

[0006] The main purpose of the present application is to provide a maintainable power capacitor module with a split type gradient pressure package to solve the problems in the related art.

[0007] In order to achieve the above object, according to one aspect of the present application, a maintainable power capacitor module of split type gradient pressure packaging is provided, comprising a split type capacitor module, the split type capacitor module comprises a plurality of capacitors, each capacitor is packaged with a 3D packaging integrated technology for capacitor units in the capacitor, an intermediate gap is left between two adjacent capacitors, a connecting part is arranged on the capacitor, the connecting part is used for connecting the capacitors in series, and the maintainable power capacitor module further comprises:

[0008] A water cooling part is arranged in the middle of the split type capacitor module, and is used for heat dissipation for the inner and outer surfaces of the first capacitor and the second capacitor.

[0009] A wind cooling part is arranged in the center of the water cooling part, and is used for heat dissipation for the side surfaces of the first capacitor and the second capacitor.

[0010] A base is arranged at the bottom of the water cooling part, and is used for mounting the split type capacitor module and providing an air inlet channel for the wind cooling part.

[0011] A fixing part is arranged at the top of the water cooling part, and is used for fixing the split type capacitor module and providing an air outlet channel for the wind cooling part.

[0012] A plurality of cold releasing parts are arranged inside the water cooling part, and are used for reducing the temperature of the water cooling part.

[0013] Further, the connecting part comprises a spring sheet and a convex plate, the spring sheet is fixedly arranged on one side of the capacitor, the convex plate is fixedly arranged on the other side of the capacitor, the bottom end of the spring sheet is fixedly provided with an inclined plate, and the inner side of the inclined plate is fixedly provided with a spring.

[0014] Further, the base comprises an annular bottom plate, an outer ring is fixedly arranged on the upper side of the outer side of the bottom plate, an inner ring is fixedly arranged on the upper side of the inner side of the bottom plate, a plurality of bottom outer air vents are arranged on the outer ring, and a plurality of bottom inner air vents are arranged on the inner ring.

[0015] Further, the water cooling part comprises a plurality of outer cooling plates and a plurality of inner cooling plates, an outer gap is formed between adjacent outer cooling plates, and an inner gap is formed between adjacent inner cooling plates.

[0016] Further, the outer cooling plate is a hollow plate, two outer partition plates are fixedly arranged in the inner part of the outer cooling plate, and the outer cooling plate is divided into two outer edge cavities and an outer middle cavity.

[0017] Further, the inner cooling plate is a hollow plate, two inner partition plates are fixedly arranged in the inner part of the inner cooling plate, and the inner cooling plate is divided into two inner edge cavities and an inner middle cavity.

[0018] Further, the air cooling part comprises an upper fan, a lower fan and an air cooling channel, the upper fan is located at the top of the air cooling channel, and the lower fan is located at the bottom of the air cooling channel.

[0019] Further, the air cooling channel comprises a support block, a central hole is arranged in the middle of the support block, a plurality of outer holes are arranged at the edge of the support block, a horizontal channel is arranged between the outer hole and the central hole, an edge hole is arranged in the middle of the horizontal channel, a plurality of through holes and a plurality of perforations are further arranged on the support block, a plurality of channels are arranged outside the perforations, and a plurality of small holes are arranged outside the channels.

[0020] Further, the fixing part comprises an annular top plate, an outer blocking ring is fixedly arranged below the outer side of the top plate, an inner blocking ring is fixedly arranged below the inner side of the top plate, a plurality of top outer ventilation openings are arranged on the outer blocking ring, and a plurality of top inner ventilation openings are arranged on the inner blocking ring; a plurality of top segmentation strips are fixedly arranged on the bottom surface of the top plate, two edge water channels and a middle water channel are arranged between adjacent top segmentation strips, and a plurality of notches are arranged through the top plate.

[0021] Further, the cold releasing part comprises a containing shell, a containing cavity is arranged in the containing shell, a plurality of through holes are arranged at the end of the containing shell, the through holes are communicated with the containing cavity, a support plate is arranged outside the containing cavity, the support plate is fixedly connected with the containing shell, a plurality of springs are fixedly arranged on the inner surface of the support plate, a push plate is fixedly arranged at the top end of the spring, and the push plate is located in the containing cavity and is slidably connected with the containing shell.

[0022] Compared with the prior art, the present application has the following beneficial effects:

[0023] The capacitor units in the capacitor are packaged by adopting the 3D packaging integration technology, the inner and outer surfaces of the capacitor are cooled by arranging the water cooling part, the temperature of the cooling water of the water cooling part is reduced by the cold releasing part, which is beneficial to the heat dissipation of the capacitor, the channels are formed between the base, the fixing part and the capacitor, and the channels are also formed between adjacent capacitors, so that the external air can enter the air cooling channel through each channel, the air cooling part can dissipate heat from the side surface and the upper and lower surfaces of the capacitor, the spring and the spring sheet jointly push the inclined plate to the convex plate without welding, so that the two are in close contact and the circuit is prevented from being broken, thereby reducing the temperature of the capacitor. A plurality of modes work together to timely discharge the heat of the capacitor and ensure the energy storage capacity of the capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole schematic view of the present application;

[0025] Figure 2 It is a sectional view of the present application;

[0026] Figure 3 It is a structure schematic view of the split capacitor module of the present application Figure 1 ;

[0027] Figure 4 A partial enlarged view of the present application;

[0028] Figure 5 A split capacitor module structure of the present application Figure 2 ;

[0029] Figure 6 A wind cooling channel structure of the present application;

[0030] Figure 7 A fixed part structure of the present application;

[0031] Figure 8 A base and water cooling part structure of the present application;

[0032] Figure 9 An internal structure of the water cooling part of the present application Figure 1 ;

[0033] Figure 10 An internal structure of the water cooling part of the present application Figure 2 ;

[0034] Figure 11 A cold releasing part structure of the present application.

[0035] Reference signs:

[0036] 1, base; 11, bottom plate; 12, bottom dividing strip; 13, outer ring; 14, bottom outer ventilation opening; 15, support strip; 16, inner ring; 17, bottom inner ventilation opening;

[0037] 2, water cooling part; 20, inner gap; 21, outer cooling plate; 211, outer edge cavity; 212, outer middle cavity; 213, outer baffle; 214, outer partition cavity; 215, outer ventilation opening; 22, inner cooling plate; 221, inner edge cavity; 222, inner middle cavity; 223, inner baffle; 224, inner partition cavity; 225, inner ventilation opening; 23, outer clamping column; 24, inner clamping column; 25, outer gap; 26, water tank; 27, inner partition plate; 28, outer partition plate; 29, water inlet;

[0038] 3, air cooling part; 31, upper fan; 32, lower fan; 33, air cooling channel; 331, support block; 332, center hole; 333, edge hole; 334, transverse channel; 335, outer hole; 336, through hole; 337, perforation; 338, channel; 339, small hole;

[0039] 4, fixed part; 41, top plate; 411, notch; 42, outer baffle ring; 421, top outer ventilation opening; 43, inner baffle ring; 431, top inner ventilation opening; 44, top dividing strip; 45, edge water channel; 46, middle water channel; 47, outer containing hole; 48, inner containing hole;

[0040] 5, split capacitor module; 51, first capacitor; 52, second capacitor; 53, post; 54, spring piece; 55, inclined plate; 56, spring; 57, convex plate; 58, middle gap;

[0041] 6, cold release part; 61, containing shell; 62, containing cavity; 63, through hole; 64, support plate; 65, spring; 66, push plate. DETAILED DESCRIPTION

[0042] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object of the application, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with the drawings and preferred embodiments.

[0043] The present embodiment provides a split type gradient pressure packaged maintainable power capacitor module, as shown in Figure 1 and 5 The split type capacitor module 5 includes five first capacitors 51 and second capacitors 52, the first capacitors 51 and the second capacitors 52 are packaged by 3D packaging integration technology for the capacitor units in the capacitors, and a middle gap 58 is left between two adjacent capacitors, a connecting part is provided on the capacitor for connecting the capacitors in series, and further comprising:

[0044] The water cooling part 2 is located in the middle of the split type capacitor module 5, and is used for cooling the inner and outer surfaces of the first capacitors 51 and the second capacitors 52;

[0045] The air cooling part 3 is located in the center of the water cooling part 2, and is used for cooling the side surfaces of the first capacitors 51 and the second capacitors 52;

[0046] The base 1 is located at the bottom of the water cooling part 2, and is used for installing the split type capacitor module 5 and providing an air inlet passage for the air cooling part 3;

[0047] The fixing part 4 is provided at the top of the water cooling part 2, and is used for fixing the split type capacitor module 5 and providing an air outlet passage for the air cooling part 3;

[0048] The cold release part 6 is provided inside the water cooling part 2, and is used for reducing the temperature of the water cooling part 2.

[0049] The first capacitor 51 and the second capacitor 52 are packaged by 3D packaging integration technology, which vertically stacks multiple capacitor units on a ceramic substrate by through-silicon via (TSV) technology and realizes interlayer electrical interconnection by laser drilling. The 3D packaging integration technology can greatly reduce the volume of the capacitor and improve the capacity density; meanwhile, the zero-crossing switching technology is adopted to suppress the switching inrush to nearly zero, reduce the harmonic injection and reduce the power grid loss.

[0050] As shown in Figure 3 and 4 , the connecting part includes a spring sheet 54 and a protruding plate 57, the spring sheet 54 is fixed on one side of the capacitor, the protruding plate 57 is fixed on the other side of the capacitor, the bottom end of the spring sheet 54 is fixed with an inclined plate 55, and the inner side of the inclined plate 55 is fixed with a spring 56. When the capacitor is placed in the base 1, the inclined plate 55 of the capacitor abuts against the protruding plate 57 of the adjacent capacitor, the two capacitors are connected in series, the spring 56 and the spring sheet 54 jointly act on the inclined plate 55 and push it to the protruding plate 57, without using welding method, so that the two are in close contact and prevent open circuit, thereby reducing the temperature of the capacitor.

[0051] As shown in Figure 8 , the base 1 includes an annular bottom plate 11, an outer ring 13 is fixed on the upper side of the outer side of the bottom plate 11, an inner ring 16 is fixed on the upper side of the inner side of the bottom plate 11, a plurality of bottom outer air vents 14 are arranged on the outer ring 13, and a plurality of bottom inner air vents 17 are arranged on the inner ring 16. Six bottom dividing strips 12 are also uniformly fixed on the bottom plate 11, which divides the bottom plate 11 into six equal parts, and the first capacitor 51 and the second capacitor 52 are located between adjacent bottom dividing strips 12, so that an intermediate gap 58 is formed between adjacent capacitors. A plurality of support strips 15 are also arranged between adjacent bottom dividing strips 12, and the support strips 15 are fixedly connected with the bottom plate 11, air ducts are formed between adjacent support strips 15, and the inner and outer ends of the air ducts correspond to the bottom inner air vents 17 and the bottom outer air vents 14 respectively, so that external air can enter the air cooling channel 33.

[0052] As shown in Figure 9 and 10 , the water cooling part 2 includes six outer cooling plates 21 and six inner cooling plates 22, an outer gap 25 is formed between adjacent outer cooling plates 21, and an inner gap 20 is formed between adjacent inner cooling plates 22. After the split capacitor module 5 is installed on the base 1, the inner and outer ends of the intermediate gap 58 correspond to the inner gap 20 and the outer gap 25 respectively, so that external air can flow through the intermediate gap 58 and enter the air cooling channel 33, thereby taking away the heat on the side of the capacitor. A plurality of outer clamping columns 23 are fixed on the top of the outer cooling plate 21, a plurality of inner clamping columns 24 are fixed on the top of the inner cooling plate 22, and threaded holes are arranged on the top of the outer clamping column 23 and the inner clamping column 24.

[0053] As shown in Figure 10As shown, the outer cold plate 21 is a hollow plate, and two outer partitions 28 are fixedly arranged inside the outer cold plate 21. The inner side of each of the two outer partitions 28 is provided with an outer baffle 213, and the outer baffle 213 is fixedly connected with the outer cold plate 21. An outer partition cavity 214 is formed between the outer baffle 213 and the corresponding outer partition 28, and an outer through port 215 is left at the bottom of the outer baffle 213. The two outer partitions 28 divide the outer cold plate 21 into two outer edge cavities 211 and an outer middle cavity 212. The outer middle cavity 212 is located between the two outer edge cavities 211. A water tank 26 is fixedly arranged at the bottom of the outer side of the outer cold plate 21, and a water pump is arranged in the water tank 26. A water inlet 29 is arranged at the connection between the water tank 26 and each of the two outer edge cavities 211, and a sealing ring is arranged between the water inlet 29 and the outer cold plate 21 to block the gap therebetween, so as to prevent the water in the water tank 26 or the outer cold plate 21 from flowing out of the gap and improve the sealing performance of the water cooling part 2. The water pump pumps the water in the water tank 26 into the two outer edge cavities 211 through the water inlets 29. When the water in the outer edge cavities 211 is full, the water flows into the outer partition cavity 214 from the top of the outer partition 28, and then flows into the outer middle cavity 212 through the outer through port 215 at the bottom of the outer baffle 213. When the water in the outer middle cavity 212 is full, the water flows into the inner middle cavity 222 through the middle water channel 46. When the water in the inner middle cavity 222 is full, the water flows into the inner partition cavities 224 from the top of the inner partition 27, and then flows into the inner edge cavities 221 through the inner through port 225 at the bottom of the inner baffle 223. When the water in the inner edge cavities 221 is full, the water flows into the edge water channel 45, and the edge water channel 45 is connected with an external container through a hose to collect the cooling water in the inner cold plate 22. The outer partition cavity 214 prevents the water in the outer middle cavity 212 from flowing into the inner middle cavity 222 through the middle water channel 46 when the water in the outer middle cavity 212 is full, so as to ensure that all the cooling water passes through the bottom of the outer middle cavity 212. The inner partition cavity 224 prevents the water in the inner middle cavity 222 from flowing into the edge water channel 45 through the top when the water in the inner edge cavities 221 is full, so as to ensure that all the cooling water passes through the bottom of the inner edge cavities 221.

[0054] The inner cold plate 22 is a hollow plate, and two inner partitions 27 are fixedly arranged inside the inner cold plate 22. The outer side of each of the two inner partitions 27 is provided with an inner baffle 223, and the inner baffle 223 is fixedly connected with the inner cold plate 22. An inner partition cavity 224 is formed between the inner baffle 223 and the corresponding inner partition 27, and an inner through port 225 is left at the bottom of the inner baffle 223. The two inner partitions 27 divide the inner cold plate 22 into two inner edge cavities 221 and an inner middle cavity 222, and the inner middle cavity 222 is located between the two inner edge cavities 221.

[0055] Sealing pads are arranged at the connection between each of the edge water channel 45 and the middle water channel 46 and the outer cold plate 21 and the inner cold plate 22, so as to prevent the water from overflowing from the two ends of the edge water channel 45 and the middle water channel 46 and improve the sealing performance of the water cooling part.

[0056] The inner walls of the outer cold plate 21 and the inner cold plate 22 are coated with waterproof paint to prevent the water in the inner walls from seeping out.

[0057] As shown in FIG. 1, the water cooling part 2 comprises an outer cold plate 21 and an inner cold plate 22. The outer cold plate 21 and the inner cold plate 22 are arranged in parallel and are connected with each other through a plurality of water channels. The outer cold plate 21 and the inner cold plate 22 are connected with each other through an edge water channel 45 and a middle water channel 46. The outer cold plate 21 is connected with the edge water channel 45 through a plurality of edge water channels 45, and the inner cold plate 22 is connected with the edge water channel 45 through a plurality of edge water channels 45. The outer cold plate 21 is connected with the middle water channel 46 through a plurality of middle water channels 46, and the inner cold plate 22 is connected with the middle water channel 46 through a plurality of middle water channels 46. Figure 2As shown, the air cooling part 3 includes an upper air fan 31, a lower air fan 32 and an air cooling channel 33, the upper air fan 31 is located at the top of the air cooling channel 33, and the lower air fan 32 is located at the bottom of the air cooling channel 33. There is a space between the upper air fan 31 and the lower air fan 32 and the air cooling channel 33, so that air can flow from the air duct on the side of the base 1 and the fixed part 4 to cool the bottom and top surfaces of the capacitor. The upper air fan 31 and the lower air fan 32 blow air from bottom to top.

[0058] As shown in Figure 6 The air cooling channel 33 includes a support block 331, the center hole 332 is arranged in the middle of the support block 331, the outer hole 335 is arranged at the edge of the support block 331, the horizontal channel 334 is arranged between the outer hole 335 and the center hole 332, the edge hole 333 is arranged in the middle of the horizontal channel 334, the through hole 336 and the perforation 337 are arranged on the support block 331, the channel 338 is arranged outside the perforation 337, and the small hole 339 is arranged outside the channel 338. The support block 331 is fixedly arranged on the inner side wall of the inner cooling plate 22. All channels in the support block 331 are small at the top and large at the bottom. After the upper air fan 31 and the lower air fan 32 are started, air is blown from the lower part to the upper part of the air cooling channel 33. After the air passes through the channel which is small at the top and large at the bottom, the air is compressed, absorbs energy, reduces the temperature of the air, and carries away more heat from the capacitor. The outer hole 335 is opposite to the inner gap 20, and the air in the middle gap 58 enters the outer hole 335 through the inner gap 20, then enters the center hole 332 and the edge hole 333 from the horizontal channel 334, and finally is discharged by the upper air fan 31, thereby carrying away the heat from the side of the capacitor. The through hole 336, the perforation 337 and the small hole 339 are used to increase the ventilation volume, and at the same time, multiple holes are independent of each other, avoiding the formation of a large hole, enhancing the strength of the air cooling channel 33, and preventing it from being deformed due to wind pressure, thereby unable to form a channel.

[0059] As shown in Figure 7 The fixed part 4 includes an annular top plate 41, an outer blocking ring 42 is fixedly arranged on the outer side of the top plate 41, an inner blocking ring 43 is fixedly arranged on the inner side of the top plate 41, a plurality of top outer ventilation holes 421 are arranged on the outer blocking ring 42, and a plurality of top inner ventilation holes 431 are arranged on the inner blocking ring 43. A plurality of inner content holes 48 for accommodating the inner clamping column 24 are arranged on the inner side of the top plate 41, and a plurality of outer content holes 47 for accommodating the outer clamping column 23 are arranged on the outer side of the top plate 41. The surfaces of the inner clamping column 24 and the outer clamping column 23 are flush after the inner clamping column 24 passes out of the inner content hole 48 and the outer clamping column 23 passes out of the outer content hole 47. Screws are screwed into the threaded holes of the outer clamping column 23 and the inner clamping column 24, so as to fix the fixed part 4 on the water cooling part 2, thereby clamping the split type capacitor module 5 between the outer cooling plate 21 and the inner cooling plate 22.

[0060] The bottom surface of the top plate 41 is fixed with six top division strips 44, two side water channels 45 and a middle water channel 46 are arranged between adjacent top division strips 44, and six notches 411 are arranged through the top plate 41. The top of the second capacitor 52 is fixed with two terminal posts 53 connected with external appliances, the terminal posts 53 can pass through the notches 411 and are connected with external appliances. As shown in Figure 7 the top division strips 44 are located inside the notches 411, the notches 411 increase the contact area of the capacitor with external air, which is beneficial to heat dissipation. The side water channels 45 and the middle water channel 46 are lower than the top division strips 44, which increases the air capacity below the top plate 41. The top division strips 44 are pressed on the top of the capacitor, which supports the top plate 41 on the capacitor. The side water channels 45, the middle water channel 46 and the top division strips 44 form channels, and the two ends of the channels are opposite to the top outer air vent 421 and the top inner air vent 431, forming an air duct.

[0061] As shown in Figure 11 the outer cold plate 21 and the inner cold plate 22 are both provided with a cold release part 6, the cold release part 6 includes a containing shell 61, the containing shell 61 is fixedly connected with the outer cold plate 21 or the inner cold plate 22, the containing shell 61 is provided with a containing cavity 62, the containing cavity 62 contains granular ammonium sulfate, the ammonium sulfate absorbs heat when dissolving in water, which reduces the temperature of the solution, which is beneficial to heat dissipation of the capacitor by the water cooling part 2. After the containing cavity 62 is filled with ammonium sulfate, the push plate 66 is pushed to move backward, and the spring 65 is compressed. The containing shell 61 is provided with a plurality of through holes 63 at the end, the through holes 63 are communicated with the containing cavity 62, the diameter of the through holes 63 is about 0.05-0.1mm, which allows a small amount of water to enter the containing cavity 62 to react with the ammonium sulfate, slows down the heat absorption speed, and prevents the temperature of the water from suddenly dropping to affect the stability of the capacitor; the containing cavity 62 is provided with a support plate 64 outside, the support plate 64 is fixedly connected with the containing shell 61, a plurality of springs 65 are fixedly arranged on the inner surface of the support plate 64, the top end of the spring 65 is fixedly provided with a push plate 66, the push plate 66 is located in the containing cavity 62 and is slidably connected with the containing shell 61. The outer edge of the push plate 66 is provided with a sealing ring, which increases the sealing property of the push plate 66 and the containing shell 61, and prevents the ammonium sulfate in the containing cavity 62 from overflowing from the outer edge of the push plate 66. The water in the cavity of the water cooling part 2 enters the containing cavity 62 through the through holes 63, reacts with the ammonium sulfate in the containing cavity 62, and reduces the water temperature of the water cooling part 2, which is beneficial to heat dissipation of the capacitor by the water cooling part 2. The ammonium sulfate dissolves in water to become a solution, the ammonium sulfate particles in the containing cavity 62 decrease, the pressure on the spring 65 decreases, the spring 65 rebounds, pushes the push plate 66 to move forward, pushes the ammonium sulfate to the end of the containing shell 61, blocks the through holes 63, prevents water from continuously flowing into the containing cavity 62, slows down the dissolution process of the ammonium sulfate, and avoids the temperature of the water cooling part 2 from suddenly dropping. A sufficient amount of ammonium sulfate is encapsulated in the containing cavity 62, the complete dissolution time of the ammonium sulfate is equal to the service life of the capacitor, and the water cooling part 2 can continuously cool down.

[0062] The first capacitor 51 and the second capacitor 52 are packaged by using the gradient pressure packaging technology, mechanical pressure is applied in different areas in a layered and progressive manner, the dielectric performance is improved, and the partial discharge is reduced.

[0063] The first capacitor 51 and the second capacitor 52 are placed between the two bottom dividing strips 12, the fixed part 4 is covered, the inner clamping column 24 passes through the inner hole 48, the outer clamping column 23 passes through the outer hole 47, and the screws are screwed into the threaded holes of the inner clamping column 24 and the outer clamping column 23, so that the split capacitor module 5 is fixed between the outer cold plate 21 and the inner cold plate 22, and the screws are unscrewed, facilitating the maintenance of the capacitor.

[0064] The upper fan 31 and the lower fan 32 are started, the lower fan 32 draws external air from the air duct of the base 1 into the air cooling channel 33, and the upper fan 31 draws air in the air cooling channel 33 out, since the air cooling channel 33 is communicated with the intermediate gap 58, under the action of the air pressure difference, external air enters the air cooling channel 33 from the intermediate gap 58, and the upper fan 31 discharges air in the air duct in the air cooling channel 33 and the fixed part 4, thereby cooling the side surface, the bottom surface and the top surface of the first capacitor 51 and the second capacitor 52.

[0065] The water pump in the water tank 26 is started, cooling water is drawn from the water tank 26 into the outer cold plate 21, the outer cold plate 21 is full of water, and then the water flows into the inner cold plate 22, the inner cold plate 22 is full of water, and then the water flows back to the water tank 26, forming a circulation, and cooling the outer surface and the inner surface of the first capacitor 51 and the second capacitor 52. At the same time, the air flowing in the air cooling channel 33 will take away the heat of the inner cold plate 22, thereby reducing the heat of the cooling water, which is conducive to reducing the heat dissipation of the first capacitor 51 and the second capacitor 52.

[0066] The water cooling part 2 is arranged to cool the inner and outer surfaces of the capacitor; the base 1 and the fixed part 4 form channels with the capacitor, and channels are also formed between adjacent capacitors, so that external air can enter the air cooling channel 33 through each channel, and the air cooling part 3 cools the side surface and the upper and lower surfaces of the capacitor; the spring 56 and the spring sheet 54 jointly push the inclined plate 55 towards the convex plate 57, without using welding method, so that the two are in close contact, preventing disconnection, thereby reducing the temperature of the capacitor. Various modes work together to timely discharge the heat of the capacitor and ensure the energy storage capacity of the capacitor.

[0067] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, as long as the changes or modifications do not deviate from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments made according to the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A maintainable power capacitor module of split gradient pressure package, comprising a split capacitor module (5) comprising a plurality of capacitors (51, 52), each of which is packaged with a capacitor cell in a 3D package integration technology, characterized in that, Two adjacent capacitors (51, 52) are left with a gap (58) in between, and the capacitors (51, 52) are provided with connecting parts for connecting the capacitors (51, 52) in series, further comprising: A water cooling part (2) in which the split capacitor module (5) is located, and the water cooling part (2) is used for heat dissipation of the inner and outer surfaces of each capacitor; The water cooling part (2) comprises a plurality of outer cooling plates (21) and a plurality of inner cooling plates (22), and the adjacent outer cooling plates (21) form an outer gap (25) therebetween, and the adjacent inner cooling plates (22) form an inner gap (20) therebetween; An air cooling part (3) located at the center of the water cooling part (2) for heat dissipation of the side surface of each capacitor; The air cooling part (3) comprises an upper fan (31), a lower fan (32) and an air cooling channel (33), the upper fan (31) is located at the top of the air cooling channel (33), and the lower fan (32) is located at the bottom of the air cooling channel (33); A base (1) located at the bottom of the water cooling part (2) for mounting the split capacitor module (5) and providing an air inlet channel for the air cooling part (3); A fixing part (4) provided at the top of the water cooling part (2) for fixing the split capacitor module (5) and providing an air outlet channel for the air cooling part (3); A cold release part (6) provided inside the water cooling part (2) for reducing the temperature of the water cooling part (2); The cold release part (6) comprises a containing shell (61) provided with a containing cavity (62) therein, a plurality of through holes (63) are provided at the end of the containing shell (61) and in communication with the containing cavity (62), a support plate (64) is provided outside the containing cavity (62) and fixedly connected with the containing shell (61), a plurality of springs (65) are fixedly provided on the inner surface of the support plate (64), a push plate (66) is fixedly provided at the top of the springs (65) and located in the containing cavity (62) and in sliding connection with the containing shell (61), and the containing cavity (62) contains granular ammonium sulfate.

2. The split gradient pressure packaged maintainable power capacitor module according to claim 1, wherein, The connecting part comprises a spring sheet (54) and a protruding plate (57), the spring sheet (54) is fixedly provided on one side of the capacitor (51, 52), the protruding plate (57) is fixedly provided on the other side of the capacitor (51, 52), the bottom end of the spring sheet (54) is fixedly provided with an inclined plate (55), and the inner side of the inclined plate (55) is fixedly provided with a spring (56).

3. The split gradient pressure packaged maintainable power capacitor module of claim 1 wherein, The base (1) comprises an annular bottom plate (11), an outer ring (13) is fixedly provided above the outer side of the bottom plate (11), an inner ring (16) is fixedly provided above the inner side of the bottom plate (11), a plurality of bottom outer air vents (14) are provided on the outer ring (13), and a plurality of bottom inner air vents (17) are provided on the inner ring (16).

4. The split gradient pressure packaged maintainable power capacitor module of claim 1 wherein, The outer cold plate (21) is a hollow plate, two outer partition plates (28) are fixedly arranged in the outer cold plate (21), and the outer cold plate (21) is divided into two outer edge cavities (211) and an outer middle cavity (212).

5. The split gradient pressure packaged maintainable power capacitor module of claim 4 wherein, The inner cold plate (22) is a hollow plate, two inner partition plates (27) are fixedly arranged in the inner cold plate (22), and the inner cold plate (22) is divided into two inner edge cavities (221) and an inner middle cavity (222).

6. The split gradient pressure packaged maintainable power capacitor module of claim 1 wherein, The air cooling channel (33) comprises a support block (331), a center hole (332) is arranged in the middle of the support block (331), a plurality of outer holes (335) are arranged at the edges of the support block (331), a transverse channel (334) is arranged between the outer holes (335) and the center hole (332), an edge hole (333) is arranged in the middle of the transverse channel (334), a plurality of through holes (336) and a plurality of perforations (337) are further arranged on the support block (331), a plurality of channels (338) are arranged outside the perforations (337), and a plurality of small holes (339) are arranged outside the channels (338).

7. The split gradient pressure packaged maintainable power capacitor module of claim 1 wherein, The fixed part (4) comprises an annular top plate (41), an outer blocking ring (42) is fixedly arranged below the outer side of the top plate (41), an inner blocking ring (43) is fixedly arranged below the inner side of the top plate (41), a plurality of top outer ventilation openings (421) are arranged on the outer blocking ring (42), a plurality of top inner ventilation openings (431) are arranged on the inner blocking ring (43), a plurality of top segmentation strips (44) are fixedly arranged on the bottom surface of the top plate (41), two edge water channels (45) and a middle water channel (46) are arranged between adjacent top segmentation strips (44), and a plurality of notches (411) are arranged through the top plate (41).

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