Thin film capacitor

Abstract

The utility model discloses a film capacitor, which comprises an outer shell with an opening at one end and a capacitor core package assembly arranged in the outer shell, a first cooling water channel arranged along the length direction is arranged at the bottom of the outer shell, and a water channel water inlet and a water channel water outlet are respectively and correspondingly arranged at two ends of the first cooling water channel. Second cooling water channels arranged in the length direction are formed in the side faces of the two transverse sides of the outer shell correspondingly. The inlet ends and the outlet ends of the second cooling water channels communicate with the water channel water inlets and the water channel water outlets correspondingly. The thin-film capacitor provided by the utility model has good heat dissipation performance, and is beneficial to prolonging the service life and improving the working performance of the thin-film capacitor.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a film capacitor. Background Art

[0002] Film capacitors are key components in new energy vehicle motor drive controllers, and their performance has a significant impact on the overall performance of the motor controller. Since film capacitors generate a large amount of heat during operation, poor heat dissipation will affect their service life and performance. Currently, the service life and performance of film capacitors are generally improved by integrating film capacitors on water-cooled plates to enhance heat dissipation or by increasing the capacitance value. However, increasing the capacitance value significantly increases the overall production cost. While a simple structure integrated on a water-cooled plate can improve the local heat dissipation performance of the capacitor, the heat dissipation efficiency is limited, and the heat dissipation uniformity is relatively poor, making it prone to local overheating.

[0003] Therefore, it is necessary to design a new film capacitor structure that can have good heat dissipation performance, thereby improving the service life and working performance of the film capacitor. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a thin film capacitor with good heat dissipation performance, which can help to improve the service life and working performance of the thin film capacitor.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a film capacitor, comprising an outer shell with an opening at one end and a capacitor core package assembly arranged in the outer shell, a first cooling water channel arranged along the length direction is provided at the bottom of the outer shell, a water channel inlet and a water channel outlet are respectively provided at both ends of the first cooling water channel, and a second cooling water channel arranged along the length direction is respectively provided on the side surfaces on both sides of the outer shell, and the inlet end and the outlet end of the second cooling water channel are respectively connected to the water channel inlet and the water channel outlet.

[0006] Furthermore, the cross-sectional area of ​​the first cooling water channel is gradually reduced along the flow direction of the water channel.

[0007] Furthermore, a heat dissipation Pin-Fin is provided in the second cooling water channel.

[0008] Furthermore, the heat dissipation Pin-Fin is arranged from sparse to dense along the flow direction of the water channel.

[0009] Furthermore, the outer shell includes a shell body, a bottom cover plate sealedly connected to the bottom of the shell body, and two side cover plates respectively sealedly connected to the lateral sides of the shell body. The bottom cover plate and the shell body form the first cooling water channel, and the side cover plate and the shell body form the second cooling water channel.

[0010] Furthermore, the shell body, bottom cover plate and side cover plates are all made of aluminum alloy.

[0011] Furthermore, the bottom cover plate and the side cover plate are fixedly connected to the shell body by friction welding.

[0012] Furthermore, the first cooling water channel includes an intermediate water channel and two bypass water channels arranged on both sides of the intermediate water channel. The bypass water channel is divided into an inlet chamber and an outlet chamber. The inlet chamber is connected to the inlet end of the second cooling water channel on the corresponding side, and the outlet chamber is connected to the outlet end of the second cooling water channel on the corresponding side; the water inlet of the water channel is connected to the two water inlet chambers and the intermediate water channel at the same time, and the water outlet of the water channel is connected to the two water outlet chambers and the intermediate water channel at the same time.

[0013] Furthermore, the water channel inlet and the water channel outlet are respectively and correspondingly arranged at the two ends of the bottom cover plate in the length direction.

[0014] Furthermore, insulating sheets are fixedly provided on the bottom surface and the inner wall surface of the outer shell, and the capacitor core package assembly is fixed in the outer shell by a potting material.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The film capacitor provided by the present invention has good heat dissipation performance, which can help to improve the service life and working performance of the film capacitor; specifically, by correspondingly arranging the first cooling water channel and the second cooling water channel arranged along the length direction on the bottom and the two lateral sides of the outer shell of the film capacitor, the water channel coverage area is made larger, and the heat dissipation efficiency is improved; the cooling medium of the second cooling water channels on both sides is circulated through the water channel inlet and the water channel outlet at both ends of the first cooling water channel, while ensuring the simplicity of the structure, ensuring that the distance between the inlet and outlet of each water channel is short, thereby ensuring that the cooling medium passes through the corresponding water channel more quickly and evenly, quickly taking away heat, effectively improving the heat dissipation efficiency and heat dissipation uniformity of the capacitor, helping to reduce the risk of local overheating, and can help to improve the service life and working performance of the film capacitor.

[0017] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the explosion structure of the utility model

[0019] Figure 2 This is a schematic diagram of the axonometric structure of the utility model

[0020] Figure 3 This is a bottom view of the utility model

[0021] Figure 4 for Figure 3 Schematic diagram of the structure after removing the bottom cover

[0022] Figure 5 This is a schematic diagram of the main view of the utility model after removing the side cover

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the utility model

[0024] Figure 7 Schematic diagram of the first cooling water channel flow

[0025] Figure 8 Schematic diagram of the second cooling water channel flow

[0026] Figure markings: 1-outer shell; 1a-shell body; 1b-bottom cover; 1c-side cover; 11-first cooling water channel; 11a-water channel inlet; 11b-water channel outlet; 111-middle water channel; 112-bypass water channel; 112a-water inlet chamber; 112b-water outlet chamber; 12-second cooling water channel; 12a-heat dissipation Pin-Fin; 121-inlet end; 122-outlet end; 2-capacitor core package assembly; 3-insulating sheet; 4-potting material. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0028] See also Figure 1-8 The present embodiment discloses a film capacitor, characterized in that it includes an outer shell 1 with an open end and a capacitor core package assembly 2 arranged in the outer shell 1, a first cooling water channel 11 arranged along the length direction is provided at the bottom of the outer shell 1, and a water channel inlet 11a and a water channel outlet 11b are provided at both ends of the first cooling water channel 11, and a second cooling water channel 12 arranged along the length direction is provided on the side surfaces of the outer shell 1 on both sides in the transverse direction (width direction), and the inlet end 121 and the outlet end 122 of the second cooling water channel 12 are connected to the water channel inlet 11a and the water channel outlet 11b respectively; The outer shell 1 is open at the top, and the open end is provided to ensure that the capacitor core package assembly 2 can be easily loaded; the capacitor core package assembly 2 adopts the core package assembly of the existing film capacitor, which usually includes a busbar, a capacitor core, etc., and does not need to be improved in design, which is not described here; the outer shell 1 preferably adopts a rectangular shell structure, and the first cooling water channel 11 and the second cooling water channel 12 are arranged in a square along the length of the outer shell 1, which can maximize the coverage of the capacitor core package assembly 2 and ensure heat dissipation efficiency; in use, the water channel inlet 11a and the water channel outlet 11b can be connected to the automobile cooling system respectively to complete the cooling cycle, see Figure 7 and Figure 8 , the direction indicated by the arrow is the flow direction of the cooling medium (usually cooling water);

[0029] The film capacitor in the above structure has good heat dissipation performance, which can help improve the service life and working performance of the film capacitor; specifically, by correspondingly arranging the first cooling water channel 11 and the second cooling water channel 12 arranged along the length direction on the bottom and the lateral sides of the film capacitor shell 1, the water channel coverage area is larger, thereby improving the heat dissipation efficiency; the cooling medium of the second cooling water channel 12 on both sides is circulated through the water channel inlet 11a and the water channel outlet 11b at both ends of the first cooling water channel 11, while ensuring the simplicity of the structure. At the same time, the distance between the inlet and outlet of each water channel is ensured to be short, thereby ensuring that the cooling medium passes through the corresponding water channel more quickly and evenly, quickly taking away heat, effectively improving the heat dissipation efficiency and heat dissipation uniformity of the capacitor, helping to reduce the risk of local overheating, and can help improve the service life and working performance of the film capacitor.

[0030] In this embodiment, the cross-sectional area of ​​the first cooling water channel 11 is gradually reduced along the flow direction of the water channel; Figure 6 The cross-section of the first cooling water channel 11 gradually decreases from the water inlet 11a end to the water outlet 11b end of the water channel; through this structural design, as the cross-sectional area gradually decreases, the fluid velocity at the bottom of the outer shell 1 will gradually increase, which can solve the problem of relatively poor heat dissipation capacity of the cooling medium when flowing through the second half of the path due to uneven cooling medium temperature (the temperature of the second half of the cooling medium path is higher than that of the first half), thereby causing uneven heat dissipation. This is conducive to further improving the heat dissipation uniformity of the film capacitor and further improving the working performance.

[0031] In this embodiment, a heat dissipation Pin-Fin 12a is provided in the second cooling water channel 12; specifically, a heat dissipation column-type Pin-Fin is adopted here; by providing the heat dissipation Pin-Fin 12a in the second cooling water channel 12, the heat dissipation Pin-Fin 12a increases the heat dissipation area, which is conducive to further improving the overall heat dissipation efficiency.

[0032] In this embodiment, the heat dissipation Pin-Fin12a is arranged from sparse to dense along the flow direction of the water channel. Through this structural design, the fluid contact area can be gradually increased, and the contact area between the fluid and the cooling medium in the latter flow path can be increased, thereby solving the uneven heat dissipation caused by the gradual increase in the temperature of the cooling medium in the flow path, which is conducive to further improving the heat dissipation uniformity of the thin film capacitor and further improving the working performance.

[0033] In this embodiment, the outer shell 1 includes a shell body 1a, a bottom cover plate 1b sealedly connected to the bottom of the shell body 1a, and two side cover plates 1c respectively sealedly connected to the lateral (width direction) sides of the shell body 1a. The bottom cover plate 1b and the shell body 1a form the first cooling water channel 11, and the side cover plate 1c and the shell body 1a form the second cooling water channel 12; the first cooling water channel 11 and the second cooling water channel 12 formed in this structural design have a simple structure, are conducive to overall manufacturing and processing, and further reduce the overall cost investment.

[0034] In this embodiment, the shell body 1a, the bottom cover plate 1b and the side cover plate 1c are all aluminum alloy parts; by adopting the outer shell 1 made of aluminum alloy metal material, compared with the traditional plastic shell, the heat conduction efficiency of aluminum alloy is higher, and the heat generated by the film capacitor can be more effectively conducted away, thereby further improving the heat dissipation efficiency; at the same time, aluminum alloy parts can contribute to the lightweight design of the car.

[0035] In this embodiment, the bottom cover plate 1b and the side cover plate 1c are fixedly connected to the shell body 1a by friction welding; specifically, the stir friction welding process is used here to complete the connection; by using friction welding to complete the fixed connection, it is beneficial to ensure the sealing performance of the connection, and at the same time the connection is reliable, and the durability and reliability are good.

[0036] In this embodiment, refer to Figures 4 to 8 The first cooling water channel 11 includes an intermediate water channel 111 and two bypass water channels 112 arranged on both sides of the intermediate water channel 111 in the transverse direction (width direction). The bypass water channel 112 is divided into a water inlet chamber 112a and a water outlet chamber 112b. The water inlet chamber 112a is connected to the inlet end 121 of the corresponding second cooling water channel 12, and the water outlet chamber 112b is connected to the outlet end 122 of the corresponding second cooling water channel 12; the water channel inlet 11a is connected to the two water inlet chambers 112a and the intermediate water channel 111 at the same time, and the water channel outlet 11b is connected to the two water outlet chambers 112a at the same time. cavity 112b and the intermediate water channel 111; specifically, the two bypass water channels 112 are symmetrically arranged on both sides of the intermediate water channel 111, the water inlet cavity 112a is connected to the inlet end 121 of the second cooling water channel 12 on the corresponding side through an opening seam provided at the bottom of the shell body 1a, and the water outlet cavity 112b is connected to the outlet end 122 of the second cooling water channel 12 on the corresponding side through an opening seam provided at the bottom of the shell body 1a; the arrangement structure of the first cooling water channel 11 and the second cooling water channel 12 in this structural design is reasonable and simple in structure, and has a good effect on improving the overall heat dissipation uniformity.

[0037] In this embodiment, the water channel inlet 11a and the water channel outlet 11b are respectively arranged at the two ends of the bottom cover plate 1b in the length direction. Specifically, the water channel inlet 11a and the water channel outlet 11b are both long holes arranged along the width direction of the bottom cover plate 1b; the water channel inlet 11a and the water channel outlet 11b are arranged at the two ends in the length direction of the bottom cover plate 1b, which has a simple structure and is conducive to manufacturing and processing.

[0038] In this embodiment, the bottom surface and the inner wall surface of the outer shell 1 are both fixedly provided with an insulating sheet 3, and the capacitor core package assembly 2 is fixed in the outer shell 1 by a potting material 4; the insulating sheet 3 here is not limited, such as a flame retardant insulating sheet, a PET insulating sheet, etc.; the potting material 4 here is not limited, such as epoxy resin, silicone, etc., and the provision of the insulating sheet 3 is conducive to ensuring the overall safety of use, and the capacitor core package assembly 2 and the outer shell 1 are fixed by the potting material 4, and the installation stability and reliability are high.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A film capacitor, characterized in that: The invention comprises an outer shell (1) with an opening at one end and a capacitor core package assembly (2) arranged in the outer shell (1); a first cooling water channel (11) arranged along the length direction is provided at the bottom of the outer shell (1); a water channel inlet (11a) and a water channel outlet (11b) are provided at both ends of the first cooling water channel (11); second cooling water channels (12) arranged along the length direction are provided on the side surfaces of the outer shell (1) on both sides in the transverse direction; an inlet end (121) and an outlet end (122) of the second cooling water channel (12) are communicated with the water channel inlet (11a) and the water channel outlet (11b) respectively.

2. The film capacitor according to claim 1, wherein: The cross-sectional area of ​​the first cooling water channel (11) is gradually reduced along the flow direction of the water channel.

3. The film capacitor according to claim 1, wherein: A heat dissipation Pin-Fin (12a) is provided in the second cooling water channel (12).

4. The film capacitor according to claim 3, wherein: The heat dissipation Pin-Fin (12a) is arranged from sparse to dense along the flow direction of the water channel.

5. The film capacitor according to claim 1, wherein: The outer shell (1) comprises a shell body (1a), a bottom cover plate (1b) sealedly connected to the bottom of the shell body (1a), and two side cover plates (1c) respectively sealedly connected to the lateral sides of the shell body (1a); the bottom cover plate (1b) and the shell body (1a) form the first cooling water channel (11), and the side cover plates (1c) and the shell body (1a) form the second cooling water channel (12).

6. The film capacitor according to claim 5, wherein: The housing body (1a), the bottom cover plate (1b) and the side cover plate (1c) are all made of aluminum alloy.

7. The film capacitor according to claim 6, wherein: The bottom cover plate (1b) and the side cover plate (1c) are fixedly connected to the shell body (1a) by friction welding.

8. The film capacitor according to claim 5, wherein: The first cooling water channel (11) comprises an intermediate water channel (111) and two bypass water channels (112) arranged on both sides of the intermediate water channel (111), the bypass water channel (112) being divided into a water inlet chamber (112a) and a water outlet chamber (112b), the water inlet chamber (112a) being connected to an inlet end (121) of a corresponding second cooling water channel (12), and the water outlet chamber (112b) being connected to an outlet end (122) of the corresponding second cooling water channel (12); the water channel inlet (11a) being connected to the two water inlet chambers (112a) and the intermediate water channel (111) at the same time, and the water channel outlet (11b) being connected to the two water outlet chambers (112b) and the intermediate water channel (111) at the same time.

9. The film capacitor according to claim 8, wherein: The water channel inlet (11a) and the water channel outlet (11b) are respectively and correspondingly arranged at two ends of the bottom cover plate (1b) in the length direction.

10. The film capacitor according to claim 1, wherein: The bottom surface and inner wall surface of the outer shell (1) are both fitted and fixed with an insulating sheet (3), and the capacitor core package assembly (2) is fixed in the outer shell (1) via a potting material (4).

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