CN220189448U

CN220189448U - Capacitor core package and capacitor

Info

Publication number: CN220189448U
Application number: CN202320432533.1U
Authority: CN
Inventors: 林占康
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Xinyuan Electronics Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Xinyuan Electronics Co Ltd
Priority date: 2023-03-08
Filing date: 2023-03-08
Publication date: 2023-12-15
Anticipated expiration: 2033-03-08

Abstract

The utility model relates to a capacitor core package and a capacitor, and belongs to the technical field of capacitors. The capacitor core package includes: the insulation paper, the positive electrode foil and the negative electrode foil are wound into a core package body after being insulated by the insulation paper, and the edges of the negative electrode foil exceed the edges of the insulation paper and the positive electrode foil along the length direction of the core package body, so that the negative electrode foil can be in contact with the shell for heat dissipation. According to the scheme provided by the utility model, the temperature rising speed of the capacitor in the using process can be slowed down, so that the temperature of the capacitor is kept in a low-temperature stable state, and the service life of the capacitor is prolonged.

Description

Capacitor core package and capacitor

Technical Field

The utility model relates to the technical field of capacitors, in particular to a capacitor core pack and a capacitor.

Background

In the prior art, a capacitor is an electronic element indispensable in the fields of electronics and electric power. The capacitor is widely applied to circuits such as power supply filtering, signal coupling, resonance, DC blocking and the like, and makes a contribution for the rapid development of modern electronic technology.

The capacitor core package is an important component of the capacitor, the core package of the coiled aluminum capacitor is composed of coiled anode foil, isolating paper and cathode foil, the core package is soaked in electrolyte, and the sealing material and the container shell are used for sealing the core package, and the foil guiding strips are led out of the anode foil and the cathode foil respectively, so that the capacitor is formed.

The existing new energy photovoltaic, new energy automobiles, military and medical power supplies have higher demands on the service life of the capacitor, so that the service life of the aluminum capacitor is continuously prolonged, and the novel energy photovoltaic, new energy automobiles, military and medical power supplies are key technologies to be solved by the technicians in the field.

The slower the temperature rise of the known capacitor in the use process, the lower the temperature of the capacitor can be kept, the more stable the filtering effect of the capacitor can be kept, and the longer the service life of the capacitor is under the same conditions. Therefore, the capacitor core bag is designed, and the temperature rising speed of the capacitor in the using process is reduced through the structure of the capacitor core bag, so that the service life of the capacitor is prolonged.

Disclosure of Invention

In order to overcome the problems in the related art, one of the purposes of the present utility model is to provide a capacitor core pack and a capacitor, wherein the capacitor core pack has a structure capable of reducing the temperature rising speed in the use process of the capacitor, thereby improving the service life of the capacitor.

A capacitor core package comprises a separation paper, a positive electrode foil and a negative electrode foil, wherein the positive electrode foil and the negative electrode foil are wound into a core package body after being separated by the separation paper,

the edges of the negative electrode foil exceed the edges of the isolating paper and the positive electrode foil along the length direction of the core pack body, so that the negative electrode foil can conduct contact heat dissipation with the shell.

In a preferred technical scheme of the utility model, the core pack body comprises a top end and a bottom end which are opposite, wherein the top end is one end of a foil guiding strip connected with a capacitor, edges of a negative foil, a separation paper and a positive foil at the top end of the core pack body are flush, and edges of the negative foil at the bottom end of the core pack body exceed edges of the separation paper and the positive foil.

In the preferred technical scheme of the utility model, the edge of the negative electrode foil at the bottom end of the core pack body exceeds the edge of the isolating paper by 0.5-1.0 mm.

In a preferred technical scheme of the utility model, the capacitor core pack further comprises a heat dissipation inner pack, wherein the positive electrode foil and the negative electrode foil are isolated by the isolating paper and then wound around the heat dissipation inner pack as an axis, so that the heat dissipation inner pack is positioned at the center of the core pack body;

along the length direction of core package body, the tip of heat dissipation inner bag surpasses the spacer paper reaches the edge of anodal foil for heat dissipation inner bag can carry out the contact heat dissipation with the shell.

In the preferred technical scheme of the utility model, the heat dissipation inner bag is formed by winding aluminum foil which is made of the same material as the negative electrode foil, and the diameter range of the heat dissipation inner bag is 13-15 mm.

In the preferred technical scheme of the utility model, the surface layer of the positive electrode foil is provided with heat conduction holes, and the heat conduction holes are uniformly distributed on the surface of the positive electrode foil.

Another object of the present utility model is to provide a capacitor, including any one of the above-mentioned capacitor core package, a case, and a foil-guiding strip, wherein the foil-guiding strip is connected to one end of the capacitor core package, and a negative foil at the other end of the capacitor core package is in contact with an inner wall of the case.

In a preferred technical scheme of the utility model, the capacitor further comprises a shell cover plate, the shell cover plate and the shell are matched to form a sealed space for accommodating the capacitor core package, the shell is provided with an opening, a cover plate step is arranged on the inner wall of the opening, the cover plate step and the inner wall of the opening form an accommodating space of the shell cover plate, and the size of the shell cover plate is matched with the accommodating space.

In the preferred technical scheme of the utility model, the side surface of the shell cover plate is provided with the first rubber layer so as to seal the shell cover plate and the inner wall of the opening, and the first rubber layer and the shell cover plate are pressed into an integrated structure.

In the preferred technical scheme of the utility model, a second rubber layer is arranged in a contact area of the shell cover plate and the cover plate step so as to seal the shell cover plate and the cover plate step, and the second rubber layer and the shell cover plate are pressed into an integrated structure.

The beneficial effects of the utility model are as follows:

the capacitor core package comprises the isolation paper, the positive electrode foil and the negative electrode foil, wherein the positive electrode foil and the negative electrode foil are wound into the core package body after being isolated by the isolation paper, and the edge of the negative electrode foil exceeds the edges of the isolation paper and the positive electrode foil along the length direction of the core package body, so that the negative electrode foil can be in contact heat dissipation with the shell.

The negative electrode foil is in contact with the shell, the negative electrode foil is made of materials with high temperature resistance and good heat conduction performance, heat generated by the positive electrode foil can be transmitted to the external environment through the shell through the negative electrode foil, the integral temperature rising speed of the capacitor is further reduced, the temperature of the capacitor is lower, the capacitor can keep a stable filtering effect the longer the capacitor is, the longer the service life of the capacitor is, the edges of the negative electrode foil in the length direction of the core bag body exceed the edges of the isolation paper and the positive electrode foil, the negative electrode foil can conduct contact heat dissipation with the shell, and the purpose of prolonging the service life of the capacitor is achieved.

The utility model also provides a capacitor comprising the capacitor core pack, and the capacitor is worthy of popularization and application in production.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.

Drawings

Fig. 1 is a schematic structural view of a capacitor core pack according to an embodiment of the present utility model;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

fig. 3 is a schematic structural view of a capacitor according to an embodiment of the present utility model;

fig. 4 is a schematic perspective view of a capacitor according to an embodiment of the present utility model;

fig. 5 is another schematic structural view of a capacitor according to an embodiment of the present utility model.

Reference numerals:

1. a core pack body; 11. a positive electrode foil; 12. a release paper; 13. a negative electrode foil; 2. a heat dissipation inner bag; 3. a housing; 31. a cover plate step; 4. a foil guide strip; 5. a housing cover plate; 51. a first rubber layer; 52. and a second rubber layer.

Detailed Description

Preferred embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the utility model. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Example 1

The service life of the capacitor is an important index of the capacitor, and the longer the service life is, the more difficult the design and production of the capacitor are.

The capacitor core package is an important component of the capacitor, and the performance of the capacitor core package plays a key role in the service life of the capacitor.

Therefore, the embodiment of the utility model provides the capacitor core bag, and the temperature rising speed of the capacitor in the using process is reduced through the structure of the capacitor core bag, so that the service life of the capacitor is prolonged.

The following describes the technical scheme of the embodiment of the present utility model in detail with reference to the accompanying drawings.

fig. 2 is an enlarged schematic view of a portion a in fig. 1.

See fig. 1 and 2.

The capacitor core package of the embodiment of the utility model comprises the isolation paper 12, the positive electrode foil 11 and the negative electrode foil 13, wherein the positive electrode foil 11 and the negative electrode foil 13 are wound into the core package body 1 after being isolated by the isolation paper 12, and the edges of the negative electrode foil 13 exceed the edges of the isolation paper 12 and the positive electrode foil 11 along the length direction of the core package body 1, so that the negative electrode foil 13 can conduct contact heat dissipation with the shell 3.

The positive electrode foil 11 of the embodiment of the present utility model uses an aluminum foil with a surface of an aluminum oxide film, and the aluminum oxide film generates a large amount of heat when the capacitor is subjected to a large ripple current. The aluminum oxide film of the positive electrode foil 11, namely the surface layer of the positive electrode foil 11, is provided with the heat conducting holes, the heat conducting holes are uniformly distributed, the depth of the heat conducting holes is shallow, and the heat transfer path is short, so that the positive electrode foil 11 has extremely strong ripple current resistance, and heat generated during use can be quickly transferred to the external environment, thereby slowing down the temperature rise of the capacitor, ensuring the stability of the internal temperature of the capacitor, and greatly prolonging the service life of the capacitor.

For example, the capacitor core package according to the embodiment of the present utility model includes two pieces of separator paper 12, one piece of positive electrode foil 11 and one piece of negative electrode foil 13, and for example, the separator paper 12 is arranged at the bottommost part, the separator paper 12, the negative electrode foil 13, the separator paper 12 and the positive electrode foil 11 are arranged in sequence from the bottom to the top, and the separator paper 12, the positive electrode foil 11 and the negative electrode foil 13 are wound into the core package body 1.

The negative electrode foil 13 of the embodiment of the utility model is prepared from an aluminum foil material which is high-temperature resistant and good in heat conduction performance.

Further, the edges of the negative electrode foil 13 along the length direction of the core pack body 1 exceed the edges of the separator 12 and the positive electrode foil 11, so that the negative electrode foil 13 can perform contact heat dissipation with the housing 3.

That is, the width of the negative electrode foil 13 is larger than the widths of the separator 12 and the positive electrode foil 11, and the widths of the negative electrode foil 13, the positive electrode foil 11, and the separator 12 refer to the length direction of the core pack body 1 after being wound into the core pack body 1. Because the width of the negative electrode foil 13 is larger than the widths of the isolating paper 12 and the positive electrode foil 11, after the positive electrode foil 11 and the negative electrode foil 13 are isolated by the isolating paper 12 and then wound into the core pack body 1, the edge of the negative electrode foil 13 exceeds the edges of the isolating paper 12 and the positive electrode foil 11 along the length direction of the core pack body 1, so that the negative electrode foil 13 can be in direct contact with the shell 3 for heat conduction.

Further, the negative electrode foil 13 can be in direct contact with the housing 3, so that heat generated by the positive electrode foil 11 can be quickly transferred to the external environment through the housing 3 by the negative electrode foil 13, the overall temperature of the capacitor is further reduced, the temperature of the capacitor is reduced, the capacitor can maintain a stable filtering effect, and the service life of the capacitor is longer under the same condition.

Further, the core pack body 1 comprises a top end and a bottom end which are opposite, the top end is one end for connecting the foil guiding strip 4, the edges of the negative electrode foil 13, the isolating paper 12 and the positive electrode foil 11 at the top end of the core pack body are flush, and the edges of the negative electrode foil 13 at the bottom end of the core pack body exceed the edges of the isolating paper 12 and the positive electrode foil 11.

The edge of the negative electrode foil 13 at the bottom end of the core pack body exceeds the edge of the release paper 12 by 0.5-1.0 mm.

The embodiment of the utility model has the beneficial effects that: the capacitor core package comprises the isolation paper, the positive electrode foil and the negative electrode foil, wherein the positive electrode foil and the negative electrode foil are wound into the core package body after being isolated by the isolation paper, and the edge of the negative electrode foil exceeds the edges of the isolation paper and the positive electrode foil along the length direction of the core package body, so that the negative electrode foil can be in contact heat dissipation with the shell.

The negative electrode foil is in contact with the shell, the negative electrode foil is made of materials with high temperature resistance and good heat conduction performance, heat generated by the positive electrode foil can be transmitted to the external environment through the negative electrode foil, the overall temperature rising speed of the capacitor is further reduced, the temperature of the capacitor is lower, the capacitor can keep a stable filtering effect, the service life of the capacitor is longer, and therefore the edge of the negative electrode foil in the length direction of the core package body exceeds the edge of the isolating paper and the edge of the positive electrode foil, the negative electrode foil can conduct contact heat dissipation with the shell, and the service life of the capacitor is further prolonged.

Example two

In the first embodiment, the edge of the negative electrode foil exceeds the edges of the separator paper and the positive electrode foil along the length direction of the core pack body, so that the negative electrode foil can be in contact with the shell for heat dissipation, and the temperature of the capacitor is reduced. The embodiment of the utility model further designs the capacitor core package to improve the heat dissipation effect of the capacitor, thereby further prolonging the service life of the capacitor.

fig. 2 is an enlarged schematic view of a portion a in fig. 1.

See fig. 1 and 2.

Further, the capacitor core pack according to the embodiment of the utility model further comprises a heat dissipation inner pack 2, the positive electrode foil 11 and the negative electrode foil 13 are isolated by the isolation paper 12 and then wound around the heat dissipation inner pack 2 as an axis, so that the heat dissipation inner pack 2 is positioned at the center of the core pack body 1, and the end part of the heat dissipation inner pack 2 exceeds the edges of the isolation paper 12 and the positive electrode foil 11 along the length direction of the core pack body 1, so that the heat dissipation inner pack 2 can conduct contact heat dissipation with the shell 3.

Further, along the length direction of the core pack body 1, the implementation mode that the end part of the heat dissipation inner pack 2 exceeds the edges of the isolating paper 12 and the positive electrode foil 11 may be that the bottom end and the top end of the heat dissipation inner pack 2 exceed the edges of the isolating paper 12 and the positive electrode foil 11, and more preferred is that the top end of the heat dissipation inner pack 2 does not exceed the edges of the isolating paper 12 and the positive electrode foil 11, and the bottom end of the heat dissipation inner pack 2 exceeds the edges of the isolating paper 12 and the positive electrode foil 11, and the exceeding range is 0.5-1.0 mm.

Further, the heat dissipation inner bag 2 is formed by winding aluminum foil of the same material as the negative electrode foil. The diameter range of the heat dissipation inner bag 2 is 13 mm-15 mm.

The material of the heat dissipation inner bag 2 is the same as the negative electrode foil 13 of the core bag body 1, and the diameter of the heat dissipation inner bag 2 is in the range of 13 mm-15 mm, and the positive electrode foil 11 and the negative electrode foil 13 are isolated by the isolating paper 12 and then wound around the heat dissipation inner bag 2 to form the capacitor core bag.

Along the length direction of the core pack body 1, the end part of the heat dissipation inner pack 2 exceeds the edges of the isolating paper 12 and the positive electrode foil 11, so that the heat dissipation inner pack 2 can conduct contact heat dissipation with the shell 3.

The heat dissipation inner bag 2 can be contacted with the outer shell 3: the heat in the center of the existing capacitor is most difficult to transfer to the external environment, so that the temperature in the center of the capacitor is too high and the overall temperature of the capacitor is too high, under the condition that the material in the center of a capacitor product is more prone to ageing and failure, the service life is shortened, but in the embodiment of the utility model, the center of the capacitor core package is set to be the heat dissipation inner package 2 formed by winding aluminum foils with the same materials as negative electrode foils, the heat dissipation inner package 2 is high-temperature resistant and good in heat conductivity, and is in direct contact with the shell 3, the heat in the center of the capacitor can be directly transferred to the external environment through a path of the heat dissipation inner package 2-the shell, the temperature in the center of the capacitor is greatly reduced, the ageing and failure time of the material in the center of the capacitor is prolonged, and the service life of the capacitor is prolonged.

The embodiment of the utility model has the beneficial effects that: according to the utility model, the heat dissipation inner package is arranged in the center of the core package body, the positive electrode foil and the negative electrode foil are isolated by the isolating paper and then are wound around the heat dissipation inner package as the shaft, and the heat dissipation inner package exceeds the edges of the isolating paper and the positive electrode foil along the length direction of the core package body, so that the heat dissipation inner package can be in contact heat dissipation with the shell.

The heat in the center of the capacitor is directly transferred to the external environment through the path of the heat dissipation inner package-outer shell, so that the temperature in the center of the capacitor is greatly reduced, the ageing and failure time of the material in the center of the capacitor is prolonged, and the service life of the capacitor is prolonged.

Example III

The utility model also provides a capacitor and corresponding embodiments corresponding to the capacitor core pack embodiments.

See fig. 3-5.

The capacitor according to the embodiment of the utility model comprises the capacitor core package of the first embodiment or the second embodiment, and the sealing performance of the capacitor according to the embodiment of the utility model is designed. The specific structure is as follows:

the capacitor of the embodiment of the utility model comprises the capacitor core package of the first embodiment or the second embodiment, a shell 3, a foil guiding strip 4 and a shell cover plate 5, wherein the shell 3 can accommodate the capacitor core package, the shell cover plate 5 and the shell 3 are matched to form a sealed space, the foil guiding strip 4 is connected to one end of the capacitor core package, and a negative foil 13 at the other end of the capacitor core package is contacted with the inner bottom surface of the shell 3. The negative electrode foil 13 is in contact with the shell 3, and the negative electrode foil 13 is made of a material with high temperature resistance and good heat conduction performance, so that heat generated by the positive electrode foil 11 is transferred to the external environment through the shell 3 by the negative electrode foil 13, the overall temperature rising speed of the capacitor is further reduced, and the service life of the capacitor can be prolonged.

Further, the casing 3 is provided with an opening, the inner wall of the opening is provided with a cover plate step 31, the cover plate step 31 and the inner wall form a containing space of the casing cover plate 5, and the size of the casing cover plate 5 is matched with the containing space, so that the casing cover plate 5 and the casing 3 can be sealed, and a sealing space is formed.

Further, a first rubber layer 51 is provided on the side surface of the housing cover 5, so that the housing cover 5 is sealed with the inner wall of the opening, and the first rubber layer 51 and the housing cover 5 are pressed together to form an integral structure.

Further, a second rubber layer 52 is provided at a contact area of the housing cover 5 and the cover step 31, so that the housing cover 5 and the cover step 31 are sealed, and the second rubber layer 52 and the housing cover 5 are pressed together to form an integral structure.

The embodiment of the utility model has the effects that: according to the capacitor, the edges of the negative electrode foil extend beyond the edges of the isolation paper and the positive electrode foil along the length direction of the core pack body, so that the negative electrode foil can be in contact with the shell for heat dissipation, and the service life of the capacitor is prolonged.

The center of the capacitor core bag is set to be a heat dissipation inner bag formed by winding aluminum foils with the same material as the negative foil, the heat dissipation inner bag is high-temperature resistant and good in heat conductivity, the center temperature of the capacitor is greatly reduced, the aging failure time of the material at the center of the capacitor is prolonged, and therefore the service life of the capacitor is further prolonged.

Besides, the first rubber layer and the second rubber layer are arranged on the shell cover plate, so that the shell cover plate can be sealed with the shell to form a capacitor with good sealing property, volatilization of electrolyte can be greatly reduced, the holding quantity of the electrolyte is improved, and the service life of the capacitor is further prolonged.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures. In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides a capacitor core package, includes positive pole foil (11), release paper (12) and negative pole foil (13), positive pole foil (11) with negative pole foil (13) are passed through after the release paper (12) keeps apart and winds into core package body (1), its characterized in that:

along the length direction of the core pack body (1), the edge of the negative electrode foil (13) exceeds the edges of the isolating paper (12) and the positive electrode foil (11), so that the negative electrode foil (13) can conduct contact heat dissipation with the shell (3).

2. The capacitor core pack of claim 1, wherein:

the core pack body (1) comprises a top end and a bottom end which are opposite, wherein the top end is one end of a foil guiding strip (4) connected with the capacitor; the edges of the negative electrode foil (13), the isolating paper (12) and the positive electrode foil (11) at the top end of the core pack body are flush, and the edges of the negative electrode foil (13) at the bottom end of the core pack body exceed the edges of the isolating paper (12) and the positive electrode foil (11).

3. The capacitor core pack of claim 2, wherein:

the distance H between the edge of the negative electrode foil (13) at the bottom end of the core pack body and the edge of the isolation paper (12) is 0.5-1.0 mm.

4. The capacitor core pack of claim 1, wherein:

the capacitor core pack further comprises a heat dissipation inner pack (2), wherein the positive electrode foil (11) and the negative electrode foil (13) are isolated by the isolating paper (12) and then wound around the heat dissipation inner pack (2) serving as an axis, so that the heat dissipation inner pack (2) is positioned at the center of the core pack body (1);

along the length direction of core package body (1), the tip of heat dissipation inner bag surpasses spacer paper (12) and the edge of anodal foil (11) for heat dissipation inner bag (2) can carry out the contact heat dissipation with shell (3).

5. The capacitor core pack of claim 4, wherein:

the heat dissipation inner bag (2) is formed by winding aluminum foil which is made of the same material as the negative electrode foil, and the diameter range of the heat dissipation inner bag (2) is 13-15 mm.

6. The capacitor core pack of claim 1, wherein:

the surface layer of the positive electrode foil (11) is provided with heat conduction holes which are uniformly distributed on the surface layer of the positive electrode foil (11).

7. A capacitor comprising a casing (3), a foil-guiding strip (4) and a capacitor core package according to any one of claims 1 to 6, said foil-guiding strip (4) being connected to one end of said capacitor core package, characterized in that a negative foil (13) at the other end of said capacitor core package is in contact with the inner wall of said casing (3).

8. The capacitor of claim 7, wherein:

the capacitor further comprises a shell cover plate (5), the shell cover plate (5) is matched with the shell (3) to form a sealing space for accommodating the capacitor core package, the shell (3) is provided with an opening, a cover plate step (31) is arranged on the inner wall of the opening, the cover plate step (31) and the inner wall of the opening form a containing space of the shell cover plate (5), and the size of the shell cover plate (5) is matched with the containing space.

9. The capacitor of claim 8, wherein:

the side of the shell cover plate (5) is provided with a first rubber layer (51) so that the shell cover plate (5) is sealed with the inner wall of the opening, and the first rubber layer (51) is pressed by the shell cover plate (5) to form an integrated structure.

10. The capacitor of claim 8, wherein:

the area of the shell cover plate (5) contacted with the cover plate step (31) is provided with a second rubber layer (52) so that the shell cover plate (5) is sealed with the cover plate step (31), and the second rubber layer (52) and the shell cover plate (5) are pressed together to form an integrated structure.