Water cooling film capacitor for automobile

Abstract

A water cooling film capacitor for an automobile belongs to the field of new energy electric automobiles. Comprising a laminated busbar, a core set and a shell, the laminated busbar and the core set are electrically connected and jointly contained in a core set containing cavity of the shell, and a shell panel is arranged at the position corresponding to a cavity opening of the core set containing cavity in a matched mode. The structure is characterized in that the structure also comprises a water cooling plate, the water cooling plate is located between the opposite sides of the laminated busbar and the core group and is in contact with the laminated busbar and the core group at the same time, and one side of the water cooling plate facing the laminated busbar is provided with a water inlet interface and a water return interface which are communicated with a water cooling plate cavity; a laminated busbar terminal abdicating hole, a water inlet interface abdicating hole and a water return interface abdicating hole are formed in the shell panel, and the water inlet interface and the water return interface extend out of the shell panel at the positions corresponding to the water inlet interface abdicating hole and the water return interface abdicating hole respectively. The capacitor has the advantages that the heat conduction between the laminated busbar and the core group can be blocked, and the capacitor is ensured to be used in a safe temperature range for a long time and stably.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy electric vehicles, and in particular relates to an automobile water-cooled film capacitor. Background Art

[0002] In recent years, as people attach great importance to the dual carbon goals of "carbon peak" and "carbon neutrality", in order to achieve "carbon reduction", all walks of life have been increasingly aware of replacing traditional fossil energy such as "oil" and "coal". A typical example is new energy vehicles (abbreviated as "NEV"), which use non-traditional fuels to reduce or even get rid of dependence on traditional fossil fuels such as oil, reduce vehicle emissions and greenhouse gas emissions, and are conducive to sustainable development. It is based on the above factors that new energy vehicles have become an important part of my country's new energy strategy and have a strong development momentum and are increasingly showing a broad market prospect.

[0003] The aforementioned film capacitors are mainly used in new energy vehicles for the DC-link capacitors of the converter, input / output filtering and inverter system buffer circuits to ensure the voltage stability at the converter end, while providing necessary filtering and protection functions. The function of the aforementioned converter in new energy vehicles is to realize the conversion of direct current into alternating current (DC-AC) and the direct conversion of alternating current of one frequency into alternating current of another frequency (AC-AC). Since silicon carbide (SiC) and silicon nitride (SiN) are semiconductor materials suitable for high voltage and high frequency, and have excellent electrical properties such as high voltage resistance, high temperature resistance, high frequency, and radiation resistance, in the converters of new energy vehicles, silicon carbide and silicon nitride power devices can significantly increase power density, reduce overall size, weight and cost, and are therefore highly valued by people. However, since silicon carbide and silicon nitride devices generate a lot of heat during operation, reasonable heat dissipation measures are usually required to ensure their stable operation.

[0004] At present and even for a long time in the future, film capacitors such as BOPP film capacitors, i.e. biaxially oriented polypropylene capacitors, will still dominate the aforementioned converters. When the hot spot temperature of such capacitors, i.e. the internal temperature during operation is 65℃-85℃, their service life can reach more than 100,000 hours. However, as the temperature rises, their service life will decrease significantly (shortened), and their withstand voltage performance will also decrease. In view of this, it is a consensus in the industry to provide cooling components for film capacitors.

[0005] Chinese patent publication number CN118098826A recommends "film capacitors with integrated cooling water channels for electric vehicles", the technical key of which is to set water channels with the shell for accommodating the film capacitor as the carrier and connect the water inlet and outlet of the water channel (for details, please refer to paragraph 0052 of the specification of the patent application). The patent application can basically realize the technical effects recorded in paragraph 0032 of its specification, but there are the following shortcomings: because it only focuses on the cooling of the film capacitor, it neglects the cooling of the busbars (positive busbars and negative busbars) of the structural system of the film capacitor, and there is a problem of losing one thing while gaining another. Because the busbar can maintain normal operation below about 125°C, its heat will undoubtedly be conducted (transferred) to the capacitor through the busbar and the capacitor terminal, causing the temperature of the film capacitor to rise. In addition, if power devices such as silicon carbide and silicon nitride are used, because their "extreme temperature (referring to the highest temperature at which the device can safely work)" is much higher than that of silicon (Si) process devices, this will undoubtedly further increase the temperature of the capacitor. From the foregoing, it can be seen that it is of positive significance to explore technical measures that can cool the film capacitors and simultaneously cool the busbars well. Summary of the invention

[0006] The task of the present invention is to provide a water-cooled film capacitor for automobiles which helps to cool the capacitor and the busbar simultaneously in a two-pronged manner so as to ensure that the capacitor serves within a safe temperature range.

[0007] The task of the present invention is accomplished in this way. A car water-cooled film capacitor includes a laminated busbar, a core group and a shell. The laminated busbar is electrically connected to the core group and is jointly accommodated in the core group accommodating cavity of the shell. A shell panel is provided at a position corresponding to the cavity opening of the core group accommodating cavity. The present invention is characterized in that it also includes a water-cooling plate, which is located between the laminated busbar and the opposite side of the core group and is in contact with the laminated busbar and the core group at the same time. A water inlet interface and a water return interface that are in communication with the water cooling plate cavity of the water cooling plate are provided on the side of the water cooling plate facing the laminated busbar; a laminated busbar terminal clearance hole, a water inlet interface clearance hole and a water return interface clearance hole are provided on the shell panel, and the water inlet interface and the water return interface extend outside the shell panel at positions corresponding to the water inlet interface clearance hole and the water return interface clearance hole respectively.

[0008] In a specific embodiment of the present invention, the laminated busbar includes a positive busbar and a negative busbar, the positive busbar is arranged horizontally and the side of the positive busbar facing downward is electrically connected to the positive end of the core group of the core group, the positive busbar has a positive column plate, the upper surface of the positive column plate in the length direction is fixed to the right edge of the side of the positive busbar facing downward and forms a vertical relationship with the positive busbar, a pair of positive column electrical connection terminals are arranged at intervals on the positive column plate, the negative busbar is arranged horizontally and the side of the negative busbar facing upward is electrically connected to the negative end of the core group of the core group, the negative busbar has a negative column plate, the lower surface of the negative column plate in the length direction is fixed to the right edge of the side of the negative busbar facing upward and forms a vertical relationship with the positive busbar, and a pair of positive column electrical connection terminals are arranged at intervals on the positive column plate. The positive and negative pole busbars are formed in a vertical relationship, and a pair of negative pole electrical connection terminals are arranged at intervals on the negative pole plate, wherein a first insulating plate for insulating and isolating the positive pole plate and the water-cooling plate is arranged between the right side surface of the water-cooling plate and the left side surface of the positive pole plate, and a second insulating plate for insulating and isolating the opposite sides of the positive and negative pole plates is arranged between the right end surface of the positive pole plate and the left side surface of the negative pole plate, the pair of positive pole electrical connection terminals sequentially pass through the second insulating plate, the negative pole plate and the laminated busbar terminal clearance hole opened on the outer shell panel and extend to the right side of the outer shell panel, and the pair of negative pole electrical connection terminals pass through the laminated busbar terminal clearance hole opened on the outer shell panel and extend to the right side of the outer shell panel.

[0009] In another specific embodiment of the present invention, a pair of positive pole electrical connection terminal yield holes are provided on the pair of negative pole plates, the pair of positive pole electrical connection terminal yield holes correspond to the pair of positive pole electrical connection terminals and form a one-to-one positional relationship with the pair of negative pole electrical connection terminals, a pair of insulating plate electrode column yield holes are provided on the second insulating plate and at positions corresponding to the pair of positive pole electrical connection terminals, the positive pole electrical connection terminals sequentially pass through a pair of insulating plate electrode column yield holes and a pair of positive pole electrical connection terminal yield holes, and then extend to the right side of the outer shell panel via the laminated busbar terminal yield holes provided on the outer shell panel; the shape and size of the first insulating plate are the same as those of the second insulating plate.

[0010] In another specific embodiment of the present invention, the laminated busbar terminal yield holes include a pair of positive pole column holes of the shell panel and a pair of negative pole column holes of the shell panel, the pair of positive pole column holes of the shell panel and the pair of negative pole column holes of the shell panel form a one-to-one positional relationship with each other, and the pair of positive and negative pole column holes of the shell panel correspond to a pair of positive and negative pole electrical connection terminals respectively, a pair of positive pole electrical connection terminals extend to the right side of the shell panel through a pair of positive pole column holes of the shell panel, and a pair of negative pole electrical connection terminals extend to the right side of the shell panel through a pair of negative pole column holes of the shell panel.

[0011] In another specific embodiment of the present invention, a positive busbar folded edge is folded downward on the right side in the length direction of the positive busbar, and a negative busbar folded edge is folded upward on the right side in the length direction of the negative busbar, the positive busbar folded edge is perpendicular to the positive busbar so that the cross-sectional shape of the positive busbar is in the shape of a ┐, and the negative busbar folded edge is perpendicular to the negative busbar so that the cross-sectional shape of the negative busbar is in the shape of a ┘; the first insulating plate is located at a position behind the water inlet interface and the water return interface when its left side avoids the obstruction of the water inlet interface and the water return interface, and is in contact with the right side of the water cooling plate, while the right side of the first insulating plate is in contact with the left side of the positive column plate, the left side of the second insulating plate is in contact with the right side of the positive column plate, and the right side of the second insulating plate is in contact with the left side of the negative column plate.

[0012] In yet another specific embodiment of the present invention, the first insulating plate and the second insulating plate are polyimide plates, polyester fiber plates or polyphenylene sulfide plates.

[0013] In a further specific embodiment of the present invention, the positive busbar and the negative busbar are made of copper plates, and the inner leads for connecting the core group to the positive busbar and the negative busbar are made of copper.

[0014] In a further specific embodiment of the present invention, each core in the core group is formed by rolling a high-temperature resistant metallized film, wherein the high-temperature resistant metallized film is an organic plastic film with a metal foil bonded to one or both surfaces, wherein the metal foil is aluminum foil, copper foil, silver foil, tin foil, nickel foil or zinc foil, and wherein the organic plastic film is a polypropylene film, a polyester film, a polyphenylene sulfide film, a polycarbonate film, a polyphenylene naphthalene film or a polyvinylidene fluoride film.

[0015] In yet another specific embodiment of the present invention, a shell fixing wing plate is formed at the left end and the right end of the shell, and a fixing hole for fixing is opened on the shell fixing wing plate; the shell is a stainless steel shell, an aluminum shell or a plastic shell; the plastic shell is a nylon PA66 / PA6 shell, a polyester shell, a polyphenylene ether shell, a polyphenylene ether shell or a polypropylene shell.

[0016] In yet another specific embodiment of the present invention, the water cooling plate is made of aluminum alloy, the water inlet interface and the water return interface are located on the front side of the left end of the water cooling plate, and the water inlet interface is located below the water return interface. When in use, the water inlet interface and the water return interface are connected to the cooling system of the automobile by pipelines.

[0017] The technical effect of the technical solution provided by the present invention is that: since a water-cooling plate with water inlet and return interfaces is added between the opposite sides of the laminated busbar and the core group to form water circulation cooling, the core group and the laminated busbar can be cooled by the water-cooling plate at the same time, and since the core group, the water-cooling plate and the laminated busbar form a series state in the form of a cooling chain, the heat conduction between the laminated busbar and the core group can be blocked, thereby ensuring that the capacitor serves durably and stably within a safe temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to more clearly understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description in the form of embodiments below. However, the description of the embodiments is not a limitation of the present invention. Any equivalent changes made based on the concept of the present invention that are merely formal and not substantial should be regarded as within the scope of the technical solution of the present invention.

[0020] In the following description, all concepts related to direction or orientation such as up, down, left, right, front, back, inside and outside are based on the current Figure 1 The position state is taken as a reference, and thus it cannot be understood as a special limitation on the technical solution provided by the present invention.

[0021] See also Figure 1 , showing a laminated busbar 1, a core group 2 and a shell 3. The laminated busbar 1 is electrically connected to the core group 2 and is accommodated together in a core group accommodating cavity 31 of the shell 3. A shell panel 32 is provided at a position corresponding to the cavity opening of the core group accommodating cavity 31. The applicant needs to explain that: Figure 1 Although the core group 2 is shown to have five cores (also called "capacitor cores" or "capacitor cores", the same below), it is obviously not limited by the number shown in the figure, because there is no fixed standard for the number of cores of film capacitors for new energy vehicles, because it depends on many factors, such as the power demand of the vehicle, the specific circuit design, the voltage demand and the specific requirements of the manufacturer. In addition, as for the number of core groups 1 itself, it also needs to be determined according to the technical requirements of the specific vehicle model, as long as it meets the specific parameter requirements of the motor drive circuit, conversion circuit and power supply system.

[0022] As the technical key points of the technical solution provided by the present invention: the structural system of the aforementioned automotive water-cooled film capacitor also includes a water-cooling plate 4, which is located between the aforementioned laminated busbar 1 and the opposite side of the aforementioned core group 2 and is in contact with the laminated busbar 1 and the core group 2 at the same time, and a water inlet interface 42 and a water return interface 43 are provided on the side of the water-cooling plate 4 facing the aforementioned laminated busbar 1, which are communicated with the water-cooling plate cavity 41 of the water-cooling plate 4; a laminated busbar terminal clearance hole 321, a water inlet interface clearance hole 322 and a water return interface clearance hole 323 are provided on the aforementioned shell panel 32, and the aforementioned water inlet interface 42 and the water return interface 43 extend to the outside of the shell panel 32 at positions corresponding to the water inlet interface clearance hole 322 and the water return interface clearance hole 323, respectively. That is, they extend to the right side of the shell panel 32.

[0023] Depend on Figure 1 As shown, the right side of the aforementioned core group 1 is in contact with the left side of the water cooling plate 4, so that the heat generated by the core group 1 is conducted by the water cooling plate 4 through heat transfer, that is, absorbed by the water cooling plate 4. In short, the water cooling plate 4 plays a role in reducing the influence of the heat accumulation effect of the capacitor on the hot spot temperature of the capacitor.

[0024] The laminated busbar 1 comprises a positive busbar 11 and a negative busbar 12, the positive busbar 11 is arranged horizontally and the side of the positive busbar 11 facing downward is electrically connected to the positive end of the core group of the core group 2, the positive busbar 11 has a positive column plate 111, the upper surface of the positive column plate 111 in the longitudinal direction is welded and fixed to the right edge of the side of the positive busbar 11 facing downward and forms a vertical relationship with the positive busbar 11, on the positive column plate 111 and located at the positive The right side of the pole plate 111 is preferably provided with a pair of positive pole electrical connection terminals 1111 at intervals by welding, the negative busbar 12 is arranged horizontally and the side of the negative busbar 12 facing upward is electrically connected to the negative end of the core group of the core group 2, the negative busbar 12 has a negative pole plate 121, the lower surface of the negative pole plate 121 in the longitudinal direction is welded and fixed to the right edge of the side of the negative busbar 12 facing upward and forms a vertical relationship with the negative busbar 12, in the A pair of negative pole electrical connection terminals 1211 are preferably arranged at intervals on the negative pole plate 121 and located on the right side of the negative pole plate 121 by welding, wherein a first insulating plate 13 for insulating and isolating the positive pole plate 111 from the water-cooling plate 4 is arranged between the right side of the aforementioned water-cooling plate 4 and the left side of the aforementioned positive pole plate 111, and a second insulating plate 14 for insulating and isolating the opposite sides of the positive and negative pole plates 111 and 121 is arranged between the right end surface of the positive pole plate 111 and the left side of the negative pole plate 121, the aforementioned pair of positive pole electrical connection terminals 1111 sequentially pass through the second insulating plate 14, the negative pole plate 121 and the laminated busbar terminal clearance hole 321 opened on the outer shell panel 32 and extend to the right side of the outer shell panel 32, and the aforementioned pair of negative pole electrical connection terminals 1211 extend to the right side of the outer shell panel 32 through the laminated busbar terminal clearance hole 321 opened on the outer shell panel 32.

[0025] See you next time Figure 1 A pair of positive pole electrical connection terminal clearance holes 1212 are provided on the aforementioned pair of negative pole plates 121, and the pair of positive pole electrical connection terminal clearance holes 1212 correspond to the aforementioned pair of positive pole electrical connection terminals 1111 and form a one-to-one positional relationship with the aforementioned pair of negative pole electrical connection terminals 1211. A pair of insulating plate electrode column clearance holes 141 are provided on the aforementioned second insulating plate 14 and at positions corresponding to the aforementioned pair of positive pole electrical connection terminals 1111. The aforementioned positive pole electrical connection terminals 1111 pass through the pair of insulating plate electrode column clearance holes 141 and the pair of positive pole electrical connection terminal clearance holes 1212 in sequence, and then extend to the right side of the outer shell panel 32 through the aforementioned laminated busbar terminal clearance holes 321 provided on the aforementioned outer shell panel 32; the shape and size of the aforementioned first insulating plate 13 are the same as those of the aforementioned second insulating plate 14.

[0026] The aforementioned laminated busbar terminal yielding hole 321 includes a pair of positive pole column holes 3211 of the shell panel and a pair of negative pole column holes 3212 of the shell panel. The pair of positive pole column holes 3211 of the shell panel and the pair of negative pole column holes 3212 of the shell panel form a one-to-one positional relationship with each other, and the pair of positive and negative pole column holes 3211, 3212 of the shell panel respectively correspond to a pair of positive and negative pole electrical connection terminals 1111, 1211, a pair of positive pole electrical connection terminals 1111 extend to the right side of the aforementioned shell panel 32 through a pair of positive pole column holes 3211 of the shell panel, and a pair of negative pole electrical connection terminals 1211 extend to the right side of the aforementioned shell panel 32 through a pair of negative pole column holes 3212 of the shell panel.

[0027] Depend on Figure 1 As shown, a positive busbar folding edge 112 is folded downward on the right side of the length direction of the positive busbar 11, and a negative busbar folding edge 122 is folded upward on the right side of the length direction of the negative busbar 12. The positive busbar folding edge 112 is perpendicular to the positive busbar 11 so that the cross-sectional shape of the positive busbar 11 is in the shape of a letter ┐, and the negative busbar folding edge 122 is perpendicular to the negative busbar 12 so that the cross-sectional shape of the negative busbar 12 is in the shape of a letter ┘; the first insulating plate 1 The position behind the water inlet interface 42 and the water return interface 43 is in contact with the right side of the water cooling plate 4 when the left side thereof avoids the obstruction of the water inlet interface 42 and the water return interface 43, and the right side of the first insulating plate 13 is in contact with the left side of the positive column plate 111, the left side of the second insulating plate 14 is in contact with the right side of the positive column plate 111, and the right side of the second insulating plate 14 is in contact with the left side of the negative column plate 121.

[0028] After the above-mentioned assembly is completed, the laminated busbar 1, the core group 2, the water-cooling plate 4, the first insulating plate 13 and the second insulating plate 14 are placed in the core group accommodating cavity 31 of the above-mentioned shell 3, and are encapsulated with epoxy resin after vacuuming, that is, all the gaps between the laminated busbar 1, the core group 2, the water-cooling plate 4, etc. and the gaps between them and the core group accommodating cavity 31 are filled with epoxy resin to form a whole with the shell 3.

[0029] In this embodiment, the first insulating plate 13 and the second insulating plate 14 are polyimide plates, but polyester fiber plates, polyphenylene sulfide plates or other equivalent insulating plates may also be used.

[0030] Preferably, the positive busbar 11 and the negative busbar 12 are made of copper plates, and the inner leads for connecting the core group 2 to the positive busbar 11 and the negative busbar 12 are made of copper.

[0031] Each core in the aforementioned core group 2 is formed by rolling a high-temperature resistant metallized film. The aforementioned high-temperature resistant metallized film is an organic plastic film with a metal foil combined on one surface (but it can also be both sides). In this embodiment, the aforementioned metal foil is aluminum foil, but it can also be copper foil, silver foil, tin foil, nickel foil or zinc foil. The aforementioned organic plastic film is a polypropylene film, but it can also be a polyester film, polyphenylene sulfide film, polycarbonate film, polyphenylene naphthalene film or polyvinylidene fluoride film.

[0032] Preferably, a shell fixing wing plate 33 is formed at the left end and the right end of the aforementioned shell 3, and a fixing hole 331 for fixing the shell 3 is opened on the shell fixing wing plate 33; the aforementioned shell 3 is a stainless steel shell, an aluminum shell or a plastic shell; in the present embodiment, the aforementioned plastic shell is a nylon shell such as a PA66 or PA6 shell, but it can also be a polyester shell, a polyphenylene ether shell, a polyphenylene ether shell or a polypropylene shell, etc.

[0033] Preferably, the water cooling plate 4 is made of aluminum alloy, the water inlet interface 42 and the water return interface 43 are located on the front left end of the water cooling plate 4, and the water inlet interface 42 is located below the water return interface 43. When in use, the water inlet interface 42 and the water return interface 43 are connected to the cooling system of the automobile by pipelines.

[0034] In the present invention, the inner core of the film capacitor adopts the gold spraying process to realize the lead-out of the core electrode. The upper and lower sides of each core of the core group 2, that is, the gold spraying layer on the upper and lower end faces, are two electrodes, and the gold spraying layer is electrically connected to the inner lead made of copper material. Specifically, one end of a group of inner leads (five in the figure) is first welded to the gold spraying layer between the upper ends of the core, and the other end is welded to the positive busbar 11. One end of another group of inner leads (five in the figure) is welded to the gold spraying layer on the lower end face of the core, and the other end is welded to the negative busbar 12.

[0035] According to common sense, the temperature of the positive and negative busbars 11 and 12 as the structural system of the laminated busbar 1 will be higher than the temperature of the core group 2. The laminated busbar 1 can maintain normal operation below 125°C, and its heat will be transferred (conducted) to the core group 2, thereby causing the temperature of the core group 2 to rise. In view of this, the present invention sets a water cooling plate 4 between the laminated busbar 1 and the core group 2, and the water cooling plate 4 takes away the heat, that is, the water cooling plate 4 improves the heat dissipation efficiency and avoids the temperature of the core group 2 from being too high. Specifically, the temperature of the core group 2 can be lowered below 85°C to achieve a working life of at least 100,000 hours.

[0036] In one embodiment of the present invention, the water inlet and return interfaces 42 and 43 are both arranged on the left front side of the water cooling plate 4. However, if conditions permit, the water inlet and return interfaces 42 and 43 can be arranged in other positions, such as diagonally, which should be regarded as the technical connotation scope disclosed by the present invention.

[0037] In summary, the technical solution provided by the present invention makes up for the shortcomings of the existing technology, successfully completes the invention task, and faithfully realizes the technical effects stated by the applicant in the technical effect column above.

Claims

1. An automotive water-cooled film capacitor, comprising a laminated busbar (1), a core group (2) and a housing (3), wherein the laminated busbar (1) is electrically connected to the core group (2) and is accommodated together in a core group accommodation cavity (31) of the housing (3), and a housing panel (32) is provided at a position corresponding to the cavity opening of the core group accommodation cavity (31), characterized in that: The invention also comprises a water cooling plate (4), which is located between the laminated busbar (1) and the opposite side of the core group (2) and is in contact with the laminated busbar (1) and the core group (2) at the same time; a water inlet interface (42) and a water return interface (43) which are in communication with the water cooling plate cavity (41) of the water cooling plate (4) are arranged on the side of the water cooling plate (4) facing the laminated busbar (1); a laminated busbar terminal clearance hole (321), a water inlet interface clearance hole (322) and a water return interface clearance hole (323) are arranged on the shell panel (32); the water inlet interface (42) and the water return interface (43) extend to the outside of the shell panel (32) at positions corresponding to the water inlet interface clearance hole (322) and the water return interface clearance hole (323) respectively.

2. The automotive water-cooled film capacitor according to claim 1, characterized in that: The laminated busbar (1) comprises a positive busbar (11) and a negative busbar (12), the positive busbar (11) being arranged in a horizontal manner and the side of the positive busbar (11) facing downward is electrically connected to the positive end of the core group of the core group (2), the positive busbar (11) having a positive column plate (111), the upper surface of the positive column plate (111) in the longitudinal direction being fixed to the right edge of the side of the positive busbar (11) facing downward and forming a vertical relationship with the positive busbar (11), A pair of positive pole electrical connection terminals (1111) are arranged at intervals on the column plate (111); the negative pole busbar (12) is arranged in a horizontal manner and the side of the negative pole busbar (12) facing upward is electrically connected to the negative end of the core group of the core group (2); the negative pole busbar (12) has a negative pole column plate (121); the lower surface of the negative pole column plate (121) in the longitudinal direction is fixed to the right edge of the side of the negative pole busbar (12) facing upward and forms a vertical relationship with the negative pole busbar (12); A pair of negative pole column electrical connection terminals (1211) are arranged at intervals on the column plate (121), wherein a first insulating plate (13) for insulating and isolating the positive pole column plate (111) and the water cooling plate (4) is arranged between the right side of the water cooling plate (4) and the left side of the positive pole column plate (111), and a first insulating plate (13) for insulating and isolating the positive pole column plate (111) and the water cooling plate (4) is arranged between the right end surface of the positive pole column plate (111) and the left side of the negative pole column plate (121). The second insulating plate (14) is separated from the outer shell panel (32), the pair of positive pole electrical connection terminals (1111) sequentially pass through the second insulating plate (14), the negative pole plate (121) and the laminated busbar terminal clearance hole (321) provided on the outer shell panel (32) to extend to the right side of the outer shell panel (32), and the pair of negative pole electrical connection terminals (1211) pass through the laminated busbar terminal clearance hole (321) provided on the outer shell panel (32) to extend to the right side of the outer shell panel (32).

3. The automotive water-cooled film capacitor according to claim 2, characterized in that: A pair of positive pole electrical connection terminal clearance holes (1212) are provided on the pair of negative pole plates (121), the pair of positive pole electrical connection terminal clearance holes (1212) correspond to the pair of positive pole electrical connection terminals (1111) and form a one-to-one positional relationship with the pair of negative pole electrical connection terminals (1211); a pair of insulating plate electrode column clearance holes (141) are provided on the second insulating plate (14) at positions corresponding to the pair of positive pole electrical connection terminals (1111); the positive pole electrical connection terminals (1111) pass through the pair of insulating plate electrode column clearance holes (141) and the pair of positive pole electrical connection terminal clearance holes (1212) in sequence, and then extend to the right side of the outer shell panel (32) through the laminated busbar terminal clearance holes (321) provided on the outer shell panel (32); the shape and size of the first insulating plate (13) are the same as those of the second insulating plate (14).

4. The automotive water-cooled film capacitor according to claim 3, characterized in that: The laminated busbar terminal clearance hole (321) comprises a pair of positive pole column holes (3211) of the shell panel and a pair of negative pole column holes (3212) of the shell panel. The pair of positive pole column holes (3211) of the shell panel and the pair of negative pole column holes (3212) of the shell panel form a one-to-one positional relationship with each other, and the pair of positive and negative pole column holes (3211, 3212) of the shell panel correspond to a pair of positive and negative pole column electrical connection terminals (1111, 1211) respectively. The pair of positive pole column electrical connection terminals (1111) extend to the right side of the shell panel (32) through the pair of positive pole column holes (3211) of the shell panel, and the pair of negative pole column electrical connection terminals (1211) extend to the right side of the shell panel (32) through the pair of negative pole column holes (3212) of the shell panel.

5. The automotive water-cooled film capacitor according to claim 2, characterized in that: A positive busbar folded edge (112) is folded downward on the right side in the length direction of the positive busbar (11), and a negative busbar folded edge (122) is folded upward on the right side in the length direction of the negative busbar (12); the positive busbar folded edge (112) is perpendicular to the positive busbar (11) so that the cross-section of the positive busbar (11) is in the shape of a Chinese character ┐, and the negative busbar folded edge (122) is perpendicular to the negative busbar (12) so that the cross-section of the negative busbar (12) is in the shape of a Chinese character ┘; the first insulating plate (13) is Its left side is located behind the water inlet interface (42) and the water return interface (43) in a state where it avoids obstruction from the water inlet interface (42) and the water return interface (43), and is in contact with the right side of the water cooling plate (4), while the right side of the first insulating plate (13) is in contact with the left side of the positive column plate (111), the left side of the second insulating plate (14) is in contact with the right side of the positive column plate (111), and the right side of the second insulating plate (14) is in contact with the left side of the negative column plate (121).

6. The automotive water-cooled film capacitor according to claim 2, characterized in that: The first insulating plate (13) and the second insulating plate (14) are polyimide plates, polyester fiber plates or polyphenylene sulfide plates.

7. The automotive water-cooled film capacitor according to claim 2 or 5, characterized in that: The positive busbar (11) and the negative busbar (12) are made of copper plates, and the inner leads used to connect the core group (2) to the positive busbar (11) and the negative busbar (12) are made of copper.

8. The automotive water-cooled film capacitor according to claim 1 or 2, characterized in that: Each core in the core group (2) is formed by rolling a high-temperature resistant metallized film, wherein the high-temperature resistant metallized film is an organic plastic film with a metal foil bonded to one or both surfaces, wherein the metal foil is aluminum foil, copper foil, silver foil, tin foil, nickel foil or zinc foil, and wherein the organic plastic film is a polypropylene film, a polyester film, a polyphenylene sulfide film, a polycarbonate film, a polyphenylene naphthalene film or a polyvinylidene fluoride film.

9. The automotive water-cooled film capacitor according to claim 1, characterized in that: A shell fixing wing plate (33) is formed at the left end and the right end of the shell (3), and a fixing hole (331) for fixing is opened on the shell fixing wing plate (33); the shell (3) is a stainless steel shell, an aluminum shell or a plastic shell; the plastic shell is a nylon PA66 / PA6 shell, a polyester shell, a polyphenylene ether shell, a polyphenylene ether shell or a polypropylene shell.

10. The automotive water-cooled film capacitor according to claim 1, characterized in that: The water cooling plate (4) is made of aluminum alloy, the water inlet interface (42) and the water return interface (43) are located at the front side of the left end of the water cooling plate (4), and the water inlet interface (42) is located below the water return interface (43). In a use state, the water inlet interface (42) and the water return interface (43) are connected to the cooling system of the automobile by pipelines.

Images