CN118016446A - Capacitor - Google Patents

Capacitor Download PDF

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Publication number
CN118016446A
CN118016446A CN202410032402.3A CN202410032402A CN118016446A CN 118016446 A CN118016446 A CN 118016446A CN 202410032402 A CN202410032402 A CN 202410032402A CN 118016446 A CN118016446 A CN 118016446A
Authority
CN
China
Prior art keywords
negative electrode
busbar
capacitor
insulating
electrode busbar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410032402.3A
Other languages
Chinese (zh)
Inventor
蓝福武
陈磊
张龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XIAMEN FARATRONIC CO Ltd
Original Assignee
XIAMEN FARATRONIC CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by XIAMEN FARATRONIC CO Ltd filed Critical XIAMEN FARATRONIC CO Ltd
Priority to CN202410032402.3A priority Critical patent/CN118016446A/en
Publication of CN118016446A publication Critical patent/CN118016446A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/228—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/005—Electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/002—Details
    • H01G4/224—Housing; Encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/33—Thin- or thick-film capacitors 

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

The invention discloses a capacitor, which comprises a shell, a capacitor core, an anode busbar and a cathode busbar, wherein the shell is provided with a plurality of capacitors; the housing defines a receiving cavity; the capacitor core is arranged in the accommodating cavity of the shell; the positive electrode busbar is connected with one end face of the capacitor core, and the positive electrode busbar is led out of the shell; the negative electrode busbar is connected with the other end face of the capacitor core, the negative electrode busbar is led out of the shell, the negative electrode busbar and the positive electrode busbar are at least partially in gap lamination arrangement, a first insulating piece is arranged between the lamination positions of the negative electrode busbar and the positive electrode busbar, a second insulating piece is coated on the positive electrode busbar or the negative electrode busbar, and a third insulating piece is arranged between the second insulating piece and the first insulating piece. The invention can meet the requirement of low self-inductance, and is not easy to lead the positive and negative electrode busbar to be conducted to form a short circuit.

Description

Capacitor
Technical Field
The invention relates to the technical field of capacitors.
Background
With the rapid development of power electronics technology, metallized film capacitors have been widely used in new energy automobile fields, and film capacitors generally comprise a capacitor core, an extraction electrode, a packaging shell and a filling resin; the capacitor core comprises polar plates, a medium and metal layers sprayed on two end faces of the medium, wherein the lead-out electrodes are generally leads, soldering lugs or bus bars, and the filling resin can be epoxy resin. When the extraction electrode is a busbar, the positive electrode busbar and the negative electrode busbar are usually partially overlapped in a projection state in order to increase the output current and to make the structure compact.
However, along with the increasing low self-inductance requirements of the automobile field on the film capacitor, in order to solve the low self-inductance requirements, in the related technology, an insulation structure is usually arranged between the positive electrode busbar and the negative electrode busbar of the film capacitor, and the insulation structure can be insulation paper, however, due to the national standard requirements of creepage distance, part of the busbar needs to be cut off, so that the busbar overlapping area is reduced, and the low self-inductance requirements cannot be met.
In order to solve the problem of low self-inductance requirement, insulating papers are coated at the lamination positions of the positive electrode busbar and the negative electrode busbar, namely two insulating papers are arranged, however, grooves are formed by coating the two insulating papers, water is easy to accumulate between the grooves in a humid environment, and the accumulated water is easy to lead to conduction between the positive electrode busbar and the negative electrode busbar to form a short circuit.
Disclosure of Invention
The present invention aims to solve at least to some extent one of the technical problems in the above-described technology. Therefore, the invention aims to provide a capacitor which meets the requirement of low self inductance and is not easy to lead the positive electrode busbar and the negative electrode busbar to be conducted to form short circuit.
To achieve the above object, an embodiment of a first aspect of the present invention provides a capacitor, including:
A housing defining a receiving cavity;
a capacitor core disposed in the receiving cavity of the case;
the positive electrode busbar is connected with one end face of the capacitor core, and the positive electrode busbar is led out of the shell;
The negative electrode busbar is connected with the other end face of the capacitor core, the negative electrode busbar is led out of the shell, the negative electrode busbar and the positive electrode busbar are arranged in a stacked mode at least partially in a gap mode, a first insulating part is arranged between the negative electrode busbar and the positive electrode busbar in a stacked mode, a second insulating part is coated on the positive electrode busbar or the negative electrode busbar, and a third insulating part is arranged between the second insulating part and the first insulating part.
According to the capacitor disclosed by the embodiment of the invention, as the negative electrode busbar and the positive electrode busbar are at least partially stacked in a clearance manner, the first insulating piece is arranged between the stacking positions of the negative electrode busbar and the positive electrode busbar, the positive electrode busbar or the negative electrode busbar is coated with the second insulating piece, the third insulating piece is arranged between the second insulating piece and the first insulating piece, the stacking area of the negative electrode busbar and the positive electrode busbar can be increased, and the self-inductance of the capacitor can be reduced due to the increase of the stacking area; the third insulating piece is arranged between the second insulating piece and the first insulating piece, so that the problem of short circuit caused by water accumulation can be solved, and the insulating capacity of the capacitor is improved. Therefore, the invention can meet the requirement of low self-inductance, and is not easy to lead the positive and negative electrode busbar to be conducted to form short circuit.
In addition, the capacitor according to the embodiment of the present invention may further have the following additional technical features:
Optionally, the positive electrode busbar comprises a positive electrode connecting part and a positive electrode leading-out part, and the positive electrode connecting part and the positive electrode leading-out part are connected in a bending way; the negative electrode busbar comprises a negative electrode connecting part and a negative electrode leading-out part, and the negative electrode connecting part and the negative electrode leading-out part are connected in a bending way; the negative electrode lead-out part and the positive electrode lead-out part are at least partially overlapped in a clearance mode; the first insulating piece is arranged between the lamination positions of the negative electrode extraction part and the positive electrode extraction part, and the second insulating piece is coated on the negative electrode extraction part or the positive electrode extraction part.
Specifically, the positive electrode connection portion and the negative electrode connection portion are arranged side by side with a gap.
Optionally, the first insulating member is at least partially provided in a double-layer insulating structure.
Optionally, the second insulating member is at least partially provided with a double-layer insulating structure, and the double-layer insulating structure is coated on the positive electrode busbar or the negative electrode busbar.
Optionally, the first insulating member, the second insulating member, and the third insulating member are insulating paper or plastic members.
Optionally, the housing is a plastic housing.
Optionally, the capacitor core is a metal film capacitor core.
Drawings
FIG. 1 is a perspective view of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an internal structure of an embodiment of the present invention;
FIG. 3 is a schematic diagram of a positive and negative busbar structure according to an embodiment of the present invention;
Fig. 4 is a cross-sectional view of an embodiment of the present invention.
Description of the reference numerals
The capacitor comprises a shell 1, a containing cavity 11, a capacitor core 2, a positive electrode busbar 3, a positive electrode connecting part 31, a positive electrode lead-out part 32, a negative electrode busbar 4, a first insulating member 5, a second insulating member 6 and a third insulating member 7.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention 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 invention to those skilled in the art.
As shown in fig. 1 to 4, a capacitor according to an embodiment of the present invention includes a case 1, a capacitor core 2, a positive electrode busbar 3 and a negative electrode busbar 4.
The housing 1 defines a receiving chamber 11, the receiving chamber 11 being used for the arrangement of the capacitor core 2. The housing 1 may be a plastic housing or a housing made of other materials.
The capacitor core 2 is placed in the receiving cavity 11 of the housing 1. A plurality of the capacitor cores 2 are typically provided in the receiving cavity 11 of the housing 1, the plurality of the capacitor cores 2 forming an electrical connection, such as by a busbar connection. Alternatively, the capacitor core 2 is a metal film capacitor core.
The positive electrode busbar 3 is connected with one end face of the capacitor core 2, and the positive electrode busbar 3 is led out of the shell 1.
The negative electrode busbar 4 is connected with the other end face of the capacitor core 2, the negative electrode busbar 4 is led out of the shell 1, the negative electrode busbar 4 and the positive electrode busbar 3 are arranged in a stacked mode at least partially in a gap mode, a first insulating piece 5 is arranged between the negative electrode busbar 4 and the stacked position of the positive electrode busbar 3, a second insulating piece 6 is coated on the positive electrode busbar 3 or the negative electrode busbar 4, and a third insulating piece 7 is arranged between the second insulating piece 6 and the first insulating piece 5. Optionally, the first insulating member 5, the second insulating member 6, and the third insulating member 7 are insulating paper or plastic members, and may be other insulating materials.
According to the capacitor disclosed by the embodiment of the invention, as the negative electrode busbar 4 and the positive electrode busbar 3 are at least partially stacked in a clearance manner, the first insulating piece 5 is arranged between the stacking positions of the negative electrode busbar 4 and the positive electrode busbar 3, the positive electrode busbar 3 or the negative electrode busbar 4 is coated with the second insulating piece 6, the third insulating piece 7 is arranged between the second insulating piece 6 and the first insulating piece 5, the stacking area of the negative electrode busbar 4 and the positive electrode busbar 3 can be increased, and the self-inductance of the capacitor can be reduced due to the increase of the stacking area; the third insulating piece 7 is arranged between the second insulating piece 6 and the first insulating piece 5, so that the problem of short circuit caused by accumulated water can be solved, and the insulating capacity of the capacitor is improved. Therefore, the invention can meet the requirement of low self-inductance, and is not easy to lead the positive and negative electrode busbar to be conducted to form short circuit.
Optionally, the positive electrode busbar 3 includes a positive electrode connecting portion 31 and a positive electrode lead-out portion 32, and the positive electrode connecting portion 31 and the positive electrode lead-out portion 32 are connected in a bending manner; the negative electrode busbar 4 comprises a negative electrode connecting part 41 and a negative electrode leading-out part 42, and the negative electrode connecting part 41 is connected with the negative electrode leading-out part 42 in a bending way; the negative electrode lead-out portion 42 and the positive electrode lead-out portion 32 are stacked at least partially with a gap therebetween; the first insulator 5 is provided between the positions where the negative electrode lead-out portion 42 and the positive electrode lead-out portion 32 are stacked, and the second insulator 6 is covered on the negative electrode lead-out portion 42 or the positive electrode lead-out portion 32.
The positive electrode connection portion 31 and the negative electrode connection portion 41 are folded inward toward the capacitor core 2 and are arranged horizontally. Specifically, the positive electrode connection portion 31 and the negative electrode connection portion 41 are arranged in parallel with a gap therebetween, so that the arrangement is convenient for connection and compact.
Optionally, the first insulating member 5 is at least partially provided in a double-layer insulating structure. The second insulating member 6 is at least partially provided with a double-layer insulating structure, and the double-layer insulating structure is coated on the positive electrode busbar 3 or the negative electrode busbar 4. The double-layer insulating structure further improves insulating performance.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. 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 invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (8)

1. A capacitor, comprising:
A housing defining a receiving cavity;
a capacitor core disposed in the receiving cavity of the case;
the positive electrode busbar is connected with one end face of the capacitor core, and the positive electrode busbar is led out of the shell;
The negative electrode busbar is connected with the other end face of the capacitor core, the negative electrode busbar is led out of the shell, the negative electrode busbar and the positive electrode busbar are arranged in a stacked mode at least partially in a gap mode, a first insulating part is arranged between the negative electrode busbar and the positive electrode busbar in a stacked mode, a second insulating part is coated on the positive electrode busbar or the negative electrode busbar, and a third insulating part is arranged between the second insulating part and the first insulating part.
2. The capacitor of claim 1 wherein said positive busbar includes a positive connection and a positive lead, said positive connection and positive lead being connected in a bent manner; the negative electrode busbar comprises a negative electrode connecting part and a negative electrode leading-out part, and the negative electrode connecting part and the negative electrode leading-out part are connected in a bending way; the negative electrode lead-out part and the positive electrode lead-out part are at least partially overlapped in a clearance mode; the first insulating piece is arranged between the lamination positions of the negative electrode extraction part and the positive electrode extraction part, and the second insulating piece is coated on the negative electrode extraction part or the positive electrode extraction part.
3. A capacitor as claimed in claim 2, wherein said positive connection is disposed in side-by-side spaced relation to said negative connection.
4. A capacitor as claimed in claim 1, wherein the first insulating member is provided at least in part in a double layer insulating structure.
5. A capacitor as claimed in claim 1, wherein the second insulating member is provided at least in part as a double layer insulating structure which is wrapped around the positive or negative electrode busbar.
6. A capacitor as claimed in claim 1, wherein the first, second and third insulating members are insulating paper or plastic members.
7. A capacitor as claimed in claim 1, wherein the housing is a plastic housing.
8. A capacitor as claimed in claim 1, wherein said capacitor core is a metal film capacitor core.
CN202410032402.3A 2024-01-09 2024-01-09 Capacitor Pending CN118016446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410032402.3A CN118016446A (en) 2024-01-09 2024-01-09 Capacitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410032402.3A CN118016446A (en) 2024-01-09 2024-01-09 Capacitor

Publications (1)

Publication Number Publication Date
CN118016446A true CN118016446A (en) 2024-05-10

Family

ID=90946524

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410032402.3A Pending CN118016446A (en) 2024-01-09 2024-01-09 Capacitor

Country Status (1)

Country Link
CN (1) CN118016446A (en)

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