Capacitor module of direct current-direct current converter

Abstract

The invention provides a capacitor module of a direct current-direct current converter, the capacitor module (100) is configured to be connected to a power module of the direct current-direct current converter for voltage stabilization and filtering, and electric energy generated by a fuel cell can be transmitted to a high-voltage battery through the power module so as to be stored and supplied to an electric component. The capacitor module (100) comprises: a first capacitor bank (101) configured to be connectable to an input side of a power module; a power module includes a first capacitor bank (101) configured to be connectable to an output side of the power module, a second capacitor bank (102) configured to be connectable to an output side of the power module, and a housing (103) defining an accommodation space inside the housing (103), the accommodation space simultaneously accommodating both the first capacitor bank (101) and the second capacitor bank (102), the housing (103) facilitating heat conduction between the first capacitor bank (101) and the second capacitor bank (102).

Description

Technical Field

[0001] The present application relates to a capacitor module for a direct current-to-direct current (DC-DC) converter of a fuel cell system. In addition, the present application relates to a DC-to-DC converter. Background Art

[0002] In the field of new energy vehicles, fuel cell vehicles, a type of vehicle that uses fuel cells as a power source, occupy a considerable proportion of the market and therefore have a certain degree of importance. For such fuel cell vehicles, the fuel cell stack, which serves as a reactor, often needs to be connected to a high-voltage battery via a DC-DC converter to store the energy generated by the fuel cell stack in the high-voltage battery. The high-voltage battery then supplies the stored energy to various components of the vehicle in an appropriate manner to achieve the corresponding functions.

[0003] In a DC-DC converter, a capacitor module is connected to both ends of a power module (e.g., via a parallel connection of both ends thereof), and therefore, the capacitor module also carries a high-intensity DC current. Due to ripple effects and other reasons, a large amount of unnecessary heat is generated in the capacitor module of such a DC-DC converter, especially in the capacitor module located on the output side. This undesirable heat generation has adverse effects on the capacitor module and even the entire DC-DC converter, for example, causing malfunctions and / or dangers, reducing the service life of the capacitor module of the DC-DC converter, etc.

[0004] In view of but not limited to the above-mentioned situations, it is desirable to provide a novel capacitor module and / or DC-DC converter to at least solve and / or alleviate the above-mentioned problems. Summary of the invention

[0005] The present application aims to provide a capacitor module for a DC-DC converter, which is advantageous in at least one aspect over the prior art.

[0006] To this end, the present application provides, in one aspect, a capacitor module of a DC-DC converter, wherein the capacitor module is configured to be connected to a power module of the DC-DC converter for voltage stabilization and filtering, and via the power module, the electric energy generated by the fuel cell can be transmitted to a high-voltage battery to be stored for supply to electrical components, and the capacitor module includes: a first capacitor group, the first capacitor group is configured to be connected to an input side of the power module; a second capacitor group, the second capacitor group is configured to be connected to an output side of the power module, and a shell, wherein a accommodating space is defined inside the shell, and the accommodating space simultaneously accommodates both the first capacitor group and the second capacitor group, and the shell facilitates heat conduction between the first capacitor group and the second capacitor group.

[0007] In a feasible embodiment, the shell includes: an electrically insulating body and a bottom heat conducting plate, wherein the thermal conductivity of the bottom heat conducting plate is greater than the thermal conductivity of the electrically insulating body, and the bottom heat conducting plate is embedded in the electrically insulating body and is in thermal contact with the first capacitor group and the second capacitor group at the same time.

[0008] In a feasible embodiment, the shell includes: an electrically insulating body and a top heat-conducting plate, wherein the thermal conductivity of the top heat-conducting plate is greater than the thermal conductivity of the insulating body, and the top heat-conducting plate is configured to cover the first capacitor group and the second capacitor group from above and to be in thermal contact with the first capacitor group and the second capacitor group at the same time, and wherein the potting glue is filled into the accommodating space through a through hole provided in the top heat-conducting plate, a through hole provided in the insulating body, or through a gap between the top heat-conducting plate and the insulating body, and the potting glue seals the components in the accommodating space and fixes the top heat-conducting plate.

[0009] In a feasible embodiment, the shell includes: a peripheral wall, which is formed around the periphery of the first capacitor group and the second capacitor group as a whole, a top heat conductive plate, which covers the first capacitor group and the second capacitor group from above and is in thermal contact with the two, and a bottom heat conductive plate, which covers the first capacitor group and the second capacitor group from below and is in thermal contact with the two, wherein the peripheral wall, the top heat conductive plate and the bottom heat conductive plate together define the accommodating space, wherein the peripheral wall is an electrical insulator; the thermal conductivity of the top heat conductive plate is greater than the thermal conductivity of the electrical insulator; the thermal conductivity of the bottom heat conductive plate is greater than the thermal conductivity of the electrical insulator.

[0010] In a possible embodiment, the peripheral wall is made of plastic.

[0011] In a feasible embodiment, the top heat conductive plate can be configured to cover the second capacitor group with its first portion and to cover the first capacitor group with its second portion, wherein the first portion is larger than the second portion, so that the thermal conduction between the second capacitor group and the top heat conductive plate is higher than the thermal conduction between the first capacitor group and the top heat conductive plate.

[0012] In a feasible embodiment, the capacitor module includes electrical insulation paper, wherein the top heat conducting plate and the bottom heat conducting plate are electrically insulated from the first capacitor group and the second capacitor group respectively via the electrical insulation paper.

[0013] In a possible implementation, the top heat conducting plate and / or the bottom heat conducting plate are configured to be in thermal contact with the heat sink, thereby enhancing the heat dissipation effect.

[0014] In a feasible embodiment, the material of the housing is plastic, and the material of the top heat conducting plate and / or the bottom heat conducting plate is selected from one or more of the following: graphene, copper, and aluminum.

[0015] In a feasible implementation manner, the first capacitor group includes five first capacitor core packages, and the second capacitor group includes four second capacitor core packages.

[0016] In another aspect, the present application also relates to a DC-DC converter, comprising: a capacitor module of the DC-DC converter as described above; and a power module, wherein the capacitor module is connected in parallel to the power module to perform voltage stabilization and filtering functions.

[0017] In yet another aspect, the present application also relates to use of the DC-DC converter as described above in a vehicle, wherein the vehicle uses a fuel cell as a power source.

[0018] The capacitor module of the DC-DC converter according to the present application is a design that can facilitate heat dissipation of the capacitor module of the DC-DC converter, and also has many advantages such as compact structure and space saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a capacitor module of a DC-DC converter according to an embodiment of the present application is shown.

[0020] Figure 2 A top view of a capacitor module of a DC-DC converter according to an embodiment of the present application is shown.

[0021] Figure 3 A side view of a capacitor module of a DC-DC converter according to an embodiment of the present application is shown.

[0022] Figure 4 A bottom view of a capacitor module of a DC-DC converter according to an embodiment of the present application is shown.

[0023] Figure 5 An exploded view of a capacitor module of a DC-DC converter according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Some feasible implementations of the present application are described below with reference to the accompanying drawings. It should be noted that the drawings are not drawn to scale. Some details may be enlarged for clear display, and some unnecessary details are omitted.

[0025] Figure 1-5A capacitor module 100 of a DC-DC converter according to an embodiment of the present application is shown, which is generally a DC-link DC support capacitor. This type of DC-DC converter is configured to transmit electrical energy from a fuel cell (not shown) to a high-voltage battery (not shown) in the form of a high DC current. In this way, the electrical energy generated by the fuel cell can be transmitted to the high-voltage battery to be stored and supplied to electrical components. Figure 1 and Figure 5 The capacitor module 100 of the DC-DC converter is shown connected to a power module (not shown) of the DC-DC converter (e.g., in parallel). The power module is configured to transmit electrical energy from a fuel cell (not shown) to a high-voltage battery (not shown) in the form of a high DC current. The capacitor module plays a role in filtering and voltage stabilization.

[0026] The capacitor module 100 has an input side (corresponding to the side where the current flows into the power module, Figure 5 The left side is shown in the figure) and the output side (corresponding to the side where the current flows out of the power module, Figure 5 The input side of the capacitor module 100 is connected to the positive electrode of the DC-DC converter, and the output side of the capacitor module 100 is connected to the negative electrode of the DC-DC converter.

[0027] The capacitor module 100 includes a first capacitor group 101 (also referred to as an input capacitor group), a second capacitor group 102 (also referred to as an output capacitor group) and a housing 103 .

[0028] An accommodation space is defined inside the housing 103, and the accommodation space accommodates both the first capacitor group 101 and the second capacitor group 102. By including the input capacitor group and the output capacitor group in the same housing, the housing 103 can facilitate heat conduction between the first capacitor group 101 and the second capacitor group 102.

[0029] The first capacitor group 101 is arranged at the input side, thereby being connected to the positive pole of the DC-DC converter. The first capacitor group 101 is configured to be connected to the input side of the power module, for example, via an input interface. The second capacitor group 102 is arranged at the output side, thereby being connected to the negative pole of the DC-DC converter. The second capacitor group 102 is configured to be connected to the input side of the power module, for example, via an output interface. In actual use, since the ripple effect has a significantly greater impact on the second capacitor group 102 located at the output side than the first capacitor group 101 located at the input side, the temperature generated by the second capacitor group 102 is significantly higher than the temperature generated by the first capacitor group 101.

[0030] The first capacitor group 101 may include one or more first capacitor core packages 1011. Figure 5As shown, the first capacitor group 101 includes five (smaller) first capacitor core packages 1011. The multiple first capacitor core packages 1011 can be arranged in parallel with each other, for example.

[0031] Accordingly, the second capacitor group 102 may include a plurality of second capacitor core packages 1021. Figure 5 As shown, the second capacitor group 102 includes four (larger) second capacitor core packages 1021. The plurality of second capacitor core packages 1021 may be arranged in parallel with each other, for example.

[0032] The number and size of the first capacitor core package 1011 and the second capacitor core package 1021 can be determined according to the capacitance value, and factors such as the use environment and / or the accommodating space of the shell can also be considered.

[0033] The first capacitor core package 1011 and the second capacitor core package 1021 can be arranged face to face with each other, which is beneficial to the operation of the capacitor module 100 of the DC-DC converter.

[0034] Additionally, the capacitor module 100 of the DC-DC converter may further include an electrode plate that matches the capacitor group. Figure 5 As shown in , the capacitor module 100 includes a first electrode plate (also referred to as a first busbar) 104 and a second electrode plate (also referred to as a second busbar) 105, wherein, via contacts (not shown), the (each) first capacitor core package 1011 of the first capacitor group 101 can be electrically connected to the first electrode plate group 104, and the (each) second capacitor core package 1021 of the second capacitor group 102 can be electrically connected to the second electrode plate group 105. The electrode plates may also be provided with through holes that match the contacts, such as Figure 5 The through hole 111 is shown in FIG.

[0035] The first electrode plate group 104 may include a first electrode top plate and a first electrode bottom plate located at the top and bottom of the first capacitor group 101, respectively, which are connected via a fastening element and have one or more conductive pins 110. For example, Figure 5 It is shown in FIG. 1 that the first electrode plate group 104 includes two conductive pins, which can be connected to an input inductor and a power module respectively.

[0036] Accordingly, the second electrode plate group 105 may be composed of a second electrode top plate and a second electrode bottom plate located at the top and bottom of the second capacitor group 102, respectively, which are connected via a fastening element and have one or more conductive pins 110. For example, Figure 5 The second electrode plate set 105 is shown to include four conductive pins, each of which can be connected to a power module.

[0037] Preferably, at least a portion of the first electrode plate group 104 and / or the second electrode plate group 105 is made of a material that facilitates heat conduction (such as copper, aluminum, etc.). In this way, the heat dissipation of the capacitor module, especially the capacitor core pack, can be further facilitated. In addition, the first electrode plate group 104 and / or the second electrode plate group 105 can also be configured to be able to thermally connect the battery core pack and the housing. In this way, heat dissipation can be further facilitated.

[0038] For example, the first electrode top plate of the first electrode plate group 104 can be configured to be thermally connected (e.g., thermally contact) the first capacitor group 101 (capacitor core package) and the top thermal conductive plate 106 (described in detail below). The first electrode bottom plate of the first electrode plate group 104 can be configured to be thermally connected (e.g., thermally contact) the first capacitor group 101 (capacitor core package) and the bottom thermal conductive plate 107 (described in detail below).

[0039] Similarly, the second electrode top plate of the second electrode plate group 105 can be configured to be thermally connected (e.g., thermally contact) the second capacitor group 102 (battery core pack) and the top heat conductive plate 106. The second electrode bottom plate of the second electrode plate group 105 can be configured to be thermally connected (e.g., thermally contact) the second capacitor group 102 (battery core pack) and the bottom heat conductive plate 107.

[0040] The housing 103, for example, the shape and / or structure of the housing 103, can be configured to be adapted to the first capacitor group 101 and the second capacitor group 102 located in the inner space, for example, the shape and / or structure of the first capacitor group 101 and the second capacitor group 102. The housing 103 can be made of an electrically insulating material (for example, plastic).

[0041] In addition, the housing 103 is also configured to facilitate heat conduction between the first capacitor group 101 and the second capacitor group 102. In particular, the housing 103 is configured to facilitate heat conduction from the second capacitor group 102 to the first capacitor group 101. Through this arrangement, during use, the cooling of the first capacitor group 102 can be facilitated in a simple and efficient manner, and the first capacitor group 101 will not be adversely affected.

[0042] The housing 103 may be formed such that its upper portion is hollowed out to cooperate with the potting compound 1031 and the top heat conducting plate 106 (described in detail below) later, thereby covering the first capacitor group 101 and the second capacitor group 102 from above and simultaneously being in thermal contact with the first capacitor group 101 and the second capacitor group 102. With this arrangement, heat conduction between the first capacitor group 101 and the second capacitor group 102 can be facilitated.

[0043] In an optional embodiment, the housing 103 may further include an electrically insulating body. The thermal conductivity of the top heat conducting plate 106 is greater than the thermal conductivity of the electrically insulating body.

[0044] The potting compound 1031 is configured to facilitate vibration reduction, heat conduction, and / or electrical insulation between the first capacitor group 101, the second capacitor group 102, and the housing 103. In this way, while facilitating heat conduction between the first capacitor group 101 and the second capacitor group 102, it is also possible to prevent the potential leakage risk of the housing 103, further extending the service life of the capacitor module 100 of the DC-DC converter.

[0045] The housing 103 may include or be configured to cooperate with a top heat conducting plate 106. The top heat conducting plate 106 may be configured to be positioned at a hollow portion of the housing 103. The material constituting the top heat conducting plate 106 may be graphene, copper, and / or aluminum, etc. It is known that the material constituting the top heat conducting plate 106 may also be any other suitable material with a relatively high thermal conductivity. In this way, the heat dissipation of the capacitor module, especially the capacitor core package, can be further facilitated.

[0046] For example, the top heat conducting plate 106 is configured to facilitate heat conduction between the first capacitor group 101 and the second capacitor group 102 via the top of the first capacitor group 101 and the top of the second capacitor group 102. In particular, the top heat conducting plate 106 is configured to facilitate heat conduction from the second capacitor group 102, such as the top of the second capacitor group 102, to the first capacitor group 101, such as the top of the first capacitor group 101. Through this arrangement, during use, the cooling of the first capacitor group 102 can be facilitated in a simple and efficient manner, and the first capacitor group 101 will not be adversely affected.

[0047] In one embodiment, the top heat conducting plate 106 can be configured such that most of it covers the second capacitor core package 1021 to more effectively enhance the heat dissipation of the second capacitor core package 1021, and is configured such that a small part other than the majority of it covers the first capacitor core package 1011. This method can save materials. In this way, the heat conduction between the second capacitor group 102 and the top heat conducting plate 106 is higher than the heat conduction between the first capacitor group 101 and the top heat conducting plate 106.

[0048] Here, "most part" may be understood as being larger than "small part" (in terms of, for example, weight and / or area). For example, "most part" may be understood as a part of the heat conducting plate 106 that is more than 50% (in terms of, for example, weight and / or area); correspondingly, "small part" may be understood as a part of the heat conducting plate 106 that is less than 50% (in terms of, for example, weight and / or area).

[0049] During the installation process, the top heat conducting plate 106 can be fixed in the potting glue 1031 through (injection and curing of) the potting glue 1031. For example, the potting glue is filled into the accommodation space through the through hole provided in the top heat conducting plate 106, the through hole provided in the insulating body, or through the gap between the top heat conducting plate 106 and the insulating body, and the potting glue seals the components in the accommodation space and fixes the top heat conducting plate 106.

[0050] Specifically, the top heat conducting plate 106 may be first placed on the protrusions on the inner wall of the housing 103, and then fixed with the potting glue 1031 as described above. Those skilled in the art will know that the potting glue is in liquid form and has no fixed shape before being injected; Figure 5 The figure shows the shape of the potting glue 1031 after being injected and cured.

[0051] The potting compound 1031 may have a protrusion 109B with a certain thickness that fits in the through hole 111 . The shape of the protrusion 109B is defined by the through hole 111 , the slot 109A on the top heat conducting plate 106 , and the electrical insulating paper 108 .

[0052] The housing 103 may include or be configured to be matched with the bottom heat conducting plate 107. The bottom heat conducting plate 107 may be configured to be insert-molded at the bottom of the housing 103. In this way, the heat dissipation effect may be further facilitated.

[0053] The material constituting the bottom heat conducting plate 107 may be graphene, copper, and / or aluminum, etc. The material constituting the bottom heat conducting plate 107 may also be any other suitable material with a relatively high thermal conductivity. In this way, the heat dissipation of the capacitor module, especially the capacitor core package, can be further facilitated.

[0054] For example, the bottom heat conducting plate 107 can be configured to be arranged facing the bottom of the first capacitor group 101 and the bottom of the second capacitor group 102. The bottom heat conducting plate 107 is configured to facilitate heat conduction between the first capacitor group 101 and the second capacitor group 102. For example, the bottom heat conducting plate 107 is configured to facilitate heat conduction between the first capacitor group 101 and the second capacitor group 102 via the bottom of the first capacitor group 101 and the bottom of the second capacitor group 102. In particular, the bottom heat conducting plate 107 is configured to facilitate heat conduction from the second capacitor group 102, such as the bottom of the second capacitor group 102, to the first capacitor group 101, such as the bottom of the first capacitor group 101. Through this arrangement, during use, the cooling of the second capacitor group 102 can be facilitated in a simple and efficient manner, and the first capacitor group 101 will not be adversely affected.

[0055] In an optional embodiment, the housing 103 may further include an electrically insulating body. The thermal conductivity of the bottom heat conducting plate 107 is greater than the thermal conductivity of the electrically insulating body.

[0056] The bottom heat conducting plate 107 is embedded in the electrical insulation body and is in thermal contact with the first capacitor group 101 and the second capacitor group 102. The arrangement of the electrical insulation body and the heat conducting plate has advantages over the all-metal housing disclosed in the prior art, for example, it can facilitate heat conduction while avoiding dangers such as electric shock.

[0057] When the heat dissipation requirement is not high, only the bottom heat conducting plate 107 can achieve the heat dissipation effect, and the top heat conducting plate 106 can be omitted. When the heat dissipation requirement is high, the heat dissipation effect is further enhanced by combining the bottom heat conducting plate 107 and the top heat conducting plate 106.

[0058] In one embodiment, the housing 103 may include a peripheral wall, a top heat conducting plate 106 and a bottom heat conducting plate 107 that together define the accommodation space. The peripheral wall is an electrical insulator and is formed around the periphery of the first capacitor group 101 and the second capacitor group 102 as a whole. The thermal conductivity of the top heat conducting plate 106 is greater than the thermal conductivity of the electrical insulator and covers the first capacitor group 101 and the second capacitor group 102 from above and is in thermal contact with both. The thermal conductivity of the bottom heat conducting plate 107 is greater than the thermal conductivity of the electrical insulator and covers the first capacitor group 101 and the second capacitor group 102 from below and is in thermal contact with both. In this way, a sufficient heat dissipation effect can be provided. In addition, since plastic is easy to manufacture and has a good insulation effect, a housing 103 with good performance and low cost can be obtained.

[0059] The capacitor module 100 may further include an electrical insulating paper 108. At least one of the top heat conducting plate 106 and the bottom heat conducting plate 107 may be electrically insulated from the first capacitor group 101 and the second capacitor group 102 via the electrical insulating paper 108. Since the thickness of the electrical insulating paper 108 is small, such thin electrical insulating paper 108 can electrically insulate the at least one of the top heat conducting plate 106 and the bottom heat conducting plate 107 from the first capacitor group 101 and the second capacitor group 102, while also minimizing the impact on thermal conductivity.

[0060] In addition, optionally, the top heat conducting plate 106 and / or the bottom heat conducting plate 107 may be configured to be in thermal contact with a heat sink (not shown, such as a liquid cooling heat sink), thereby further enhancing the heat dissipation effect.

[0061] Figure 2-Figure 4 The top view, side view and bottom view of the capacitor module of the DC-DC converter according to one embodiment of the present application are respectively shown. Figure 2-Figure 4 The above description can be more easily understood with the display of

[0062] In addition, it can be easily known that the capacitor module 100 of the DC-DC converter may further include a control system and / or a controller.

[0063] Optionally, the control system and / or the controller may include a detection unit. The detection unit can be configured to detect a temperature state of the capacitor module 100 of the DC-DC converter, in particular, for example, the second capacitor group 102 of the capacitor module 100 of the DC-DC converter.

[0064] Optionally, the control system and / or the controller may include an execution unit. The execution unit can be configured to adjust the capacitor module 100 of the DC-DC converter according to the detected temperature state (for example, adjusting the operation of the heat sink associated with the top heat conducting plate 106 and / or the bottom heat conducting plate 107; for another example, by adjusting the current in the power module connected to the capacitor module 100), thereby effectively controlling the temperature state of the capacitor module 100 of the DC-DC converter.

[0065] It can be easily understood that the control system and / or controller may also include other suitable elements, including but not limited to: a communication unit, a computing unit and / or a simulation unit, etc.

[0066] The present application also relates to a DC-DC converter, which comprises: a capacitor module 100 and a power module according to the DC-DC converter disclosed in the present application, wherein the capacitor module 100 is used to be connected to the power module to play the role of voltage stabilization and filtering.

[0067] The present application also relates to a fuel cell vehicle. The fuel cell vehicle comprises the above DC-DC converter. The present application also relates to the application of the DC-DC converter as described above in a vehicle, wherein the vehicle comprises a fuel cell.

[0068] As used herein, the term “comprising” is open ended and includes one or more stated features, elements, components, or functions, but does not preclude the presence or addition of one or more other features, elements, components, functions, or combinations thereof.

[0069] It is expressly intended that within the scope of the present application, the various aspects, embodiments, examples and alternatives listed in the preceding paragraphs, claims and / or in the following description and figures, and in particular the individual features thereof, may be used independently or in any combination. That is, all embodiments and / or features of any embodiment may be used in any manner and / or combination unless such features are incompatible. Applicants reserve the right to change any originally filed claims or to file any new claims accordingly, including amending any originally filed claim to be subordinate to and / or incorporate any features of any other claim, even though not originally claimed in this manner.

[0070] Although the present application is described herein with reference to specific embodiments, the scope of the present application is not limited to the details shown. Various modifications may be made to these details without departing from the basic principles of the present application.

Claims

1. A capacitor module for a DC-DC converter, wherein: The capacitor module (100) is configured to be connected to a power module of a DC-DC converter for voltage stabilization and filtering. Through the power module, the electric energy generated by the fuel cell can be transmitted to the high-voltage battery for storage and supply to the electric components. The capacitor module (100) comprises: A first capacitor group (101), the first capacitor group (101) being configured to be connectable to an input side of a power module; a second capacitor group (102) configured to be connectable to an output side of the power module, and A shell (103) defines a storage space inside the shell (103), wherein the storage space simultaneously stores both the first capacitor group (101) and the second capacitor group (102), and the shell (103) facilitates heat conduction between the first capacitor group (101) and the second capacitor group (102).

2. The capacitor module of the DC-DC converter according to claim 1, wherein: The housing (103) comprises: an electrically insulating body and a bottom heat conducting plate (107). The thermal conductivity of the bottom heat conducting plate (107) is greater than the thermal conductivity of the electrical insulation body. The bottom heat conducting plate (107) is embedded in the electrical insulation body and is in thermal contact with the first capacitor group (101) and the second capacitor group (102).

3. The capacitor module of the DC-DC converter according to claim 1, wherein: The housing (103) comprises: an electrically insulating body and a top heat conducting plate (106). The thermal conductivity of the top heat conducting plate (106) is greater than the thermal conductivity of the insulating body, and the top heat conducting plate (106) is configured to cover the first capacitor group (101) and the second capacitor group (102) from above and to be in thermal contact with the first capacitor group (101) and the second capacitor group (102) at the same time. And wherein, the potting glue is filled into the accommodating space through a through hole provided in the top heat conducting plate (106), a through hole provided in the insulating body, or through a gap between the top heat conducting plate (106) and the insulating body, and the potting glue seals the components in the accommodating space and fixes the top heat conducting plate (106).

4. The capacitor module of the DC-DC converter according to claim 1, wherein: The housing (103) comprises: A peripheral wall, the peripheral wall is formed around the periphery of the first capacitor group (101) and the second capacitor group (102) as a whole, a top heat conducting plate (106) covering the first capacitor group (101) and the second capacitor group (102) from above and in thermal contact with both of them, and a bottom heat conducting plate (107), the bottom heat conducting plate (107) covering the first capacitor group (101) and the second capacitor group (102) from below and being in thermal contact with the two, The peripheral wall, the top heat conducting plate (106) and the bottom heat conducting plate (107) together define the accommodation space. The peripheral wall is an electrical insulator, the thermal conductivity of the top heat conducting plate (106) is greater than the thermal conductivity of the electrical insulator, and the thermal conductivity of the bottom heat conducting plate (107) is greater than the thermal conductivity of the electrical insulator.

5. The capacitor module of the DC-DC converter according to claim 4, wherein: The peripheral wall is made of plastic.

6. The capacitor module of the DC-DC converter according to claim 3, wherein: The top heat conducting plate (106) can be configured to cover the second capacitor group (102) with its first portion and to cover the first capacitor group (101) with its second portion, wherein the first portion is larger than the second portion, so that the thermal conduction between the second capacitor group (102) and the top heat conducting plate (106) is higher than the thermal conduction between the first capacitor group (101) and the top heat conducting plate (106).

7. The capacitor module of the DC-DC converter according to claim 3, wherein: The capacitor module (100) comprises electrical insulating paper (108), The top heat conducting plate (106) and the bottom heat conducting plate (107) are electrically insulated from the first capacitor group (101) and the second capacitor group (102) respectively via the electrical insulating paper (108).

8. The capacitor module of the DC-DC converter according to claim 3, wherein: The top heat conducting plate (106) and / or the bottom heat conducting plate (107) are configured to be in thermal contact with the heat sink, thereby enhancing the heat dissipation effect.

9. The capacitor module of the DC-DC converter according to claim 3, wherein: The material of the housing is plastic, and the material of the top heat conducting plate (106) and / or the bottom heat conducting plate (107) is selected from one or more of the following: graphene, copper, and aluminum.

10. The capacitor module of the DC-DC converter according to claim 1 or 2, wherein: The first capacitor group (101) includes five first capacitor core packages (1011), and the second capacitor group (102) includes four second capacitor core packages (1021).

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