CN216353618U - Small-size surface mounting circuit protection component - Google Patents
Small-size surface mounting circuit protection component Download PDFInfo
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- CN216353618U CN216353618U CN202122489261.2U CN202122489261U CN216353618U CN 216353618 U CN216353618 U CN 216353618U CN 202122489261 U CN202122489261 U CN 202122489261U CN 216353618 U CN216353618 U CN 216353618U
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Abstract
The utility model relates to a small-size surface-mounted circuit protection component, which comprises the following parts: a flat plate-shaped insulating base material; the upper electrode and the lower electrode are respectively attached to the upper surface and the lower surface of the insulating base material; the upper electrode is composed of a left upper polar plate and a right upper polar plate which are respectively provided with 2-4 finger-shaped intersections and are insulated with each other; the lower electrode consists of a left lower polar plate and a right lower polar plate which are respectively arranged at two ends of the insulating base material; the left conductive film connects the left upper polar plate and the left lower polar plate together to form a left electrode, and the right conductive film connects the right upper polar plate and the right lower polar plate together to form a right electrode; a PPTC film made of polymer positive temperature coefficient material is attached to the finger-shaped cross region of the upper electrode to connect the left electrode and the right electrode together; the insulating protective layer is attached to the upper surface of the PPTC film. The utility model is more suitable for product miniaturization, and the PPTC material is protected in the insulating protective layer and is not influenced by environmental factors, thus having better weather resistance.
Description
Technical Field
The utility model belongs to the technical field of overcurrent protection electronic component materials, and particularly relates to a small-size surface-mounted circuit protection component.
Background
The technology of the resistance temperature coefficient characteristic comprises a Polymer Positive Temperature Coefficient (PPTC), a Ceramic Positive Temperature Coefficient (CPTC) and a Negative Temperature Coefficient (NTC), has quick response to current and temperature, is mainly used for overcurrent and over-temperature protection, and can also be used for temperature switching and temperature indication. Therefore, the surface-mounted circuit protection component manufactured based on the technology is widely used in an overcurrent and overtemperature protection device of a circuit and is used in series in the circuit. The surface-mounted PTC over-current protection element at least comprises a PPTC material, an electrode and a conductive component and is prepared by a surface mounting process.
The core component of the protective element is a polymer conductive composite material (PPTC material) and an electrode connected with the PPTC material. The core component of the protection element is in a low-resistance state at room temperature, and an electronic circuit is in a path state; when the temperature rises or the circuit has a fault and large current, the resistance of the circuit jumps to thousands of times, and the circuit is protected. When the temperature recovers or the fault current is eliminated, the resistance of the protection element recovers to be normal.
The existing surface-mounted circuit protection component has larger size, relatively stable structure and mature process, the thermal process (such as temperature and stress of reflow soldering, coating thermosetting and injection molding) in assembly and application has smaller influence on the material and the structure of a product, and the influence of environmental factors such as temperature, humidity and the like in the environment is smaller, so that the performance and the long-term reliability of the surface-mounted circuit protection component are better.
However, due to the demand of the emerging market (emerging consumer electronics, wearable devices, Integrated Circuits (ICs), overcurrent and overtemperature protection applications of power charging wires) for power and assembly space, the overcurrent protection element also tends to be smaller and thinner, the demand for small-sized protection devices is increasing, and the conventional package size of 1206, 0805 and the like is gradually unable to meet the application demand. However, small-sized components (such as 0603, 0402, 0201, and even 01005) cannot be realized if the design structure and processing technology similar to the large-sized components are adopted, the stability of the structure of the small-sized product is poor, and the thermal process (such as reflow soldering, coating thermosetting, and injection molding temperature) in assembly and application is easy to cause structural deformation, thereby affecting the performance of the product. Due to the relatively small size, the temperature and humidity of the product are also liable to affect the structure of the product and the material, thereby affecting the reliability of the product in long-term use.
Therefore, small-sized surface mount devices, which are processed based on the above techniques, have to solve three problems: the new structure is machinable; thermal stability problems of the structure; the influence of environmental factors causes the problem of product reliability.
Chinese patent document CN111640548A discloses a small-sized surface-mounted polymer PTC overcurrent protection device, which includes a PTC chip, an insulating layer, a terminal electrode, and at least one conductive member, wherein a separation gap is designed in the first conductive electrode to form a first conductive region and a second conductive region, and the conductive member is disposed at the edge or at least one corner of the first conductive region of the PTC chip; the dividing gap of the first conductive electrode includes a major portion parallel to the longitudinal direction of the first terminal electrode and the second terminal electrode. However, the PTC chip disclosed in the document is exposed to the environment and is not isolated from the external environment, so that the conductive characteristics of the PTC chip can be influenced by the influence of environmental factors such as temperature and humidity due to the adoption of some tungsten carbide and titanium carbide-like ceramic conductive materials, and further the conductive characteristics and reliability of the PPTC material can be influenced; moreover, this document is a conventional design, which cannot be achieved if a product of ultra small size (e.g. 0201, 01005) is made.
Chinese patent document CN111681845A discloses a surface-mounted overcurrent protection element, which has at least one resistance positive temperature effect conductive composite material core material, and at least one surface of the core material is directly covered with a metal electrode; at least one conductive lead member having one end electrically connected to a portion of the core material and the other end electrically connected to a metal electrode; at least one part of the conductive composite material core material and one part of the conductive lead component are wrapped by plastic package and isolated from the external environment. However, this document is limited to the manufacturing process limitation in particular in the problem of downsizing of products, and cannot satisfy the manufacturing of small-sized 0402, 0201 and smaller-sized surface mount products.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a small-size surface-mounted circuit protection component and a preparation method thereof, which aim to solve the problems of structural thermal stability of a small-size protection product, long-term reliability reduction of the product due to the influence of environmental factors and the like.
The purpose of the utility model is solved by adopting the following technical scheme.
The utility model relates to a small-size surface-mounted circuit protection component, which comprises the following parts: a flat plate-shaped insulating base material; the upper electrode and the lower electrode are respectively attached to the upper surface and the lower surface of the insulating base material;
the device is characterized in that the upper electrode is composed of a left upper polar plate and a right upper polar plate which are respectively provided with 2-4 finger-shaped intersections and are insulated from each other; the lower electrode consists of a left lower polar plate and a right lower polar plate which are respectively arranged at two ends of the insulating base material; the left conductive film connects the left upper polar plate and the left lower polar plate together to form a left electrode, and the right conductive film connects the right upper polar plate and the right lower polar plate together to form a right electrode; a PPTC film made of polymer positive temperature coefficient material is attached to the finger-shaped cross region of the upper electrode, and the left electrode and the right electrode are connected together to form a device with overcurrent and overtemperature protection functions; the insulating protective layer is attached to the upper surface of the PPTC film.
Preferably, the uncovered parts of the left upper polar plate and the right upper polar plate are provided with a left upper bonding pad and a right upper bonding pad, and the outer surfaces of the left lower polar plate and the right lower polar plate are provided with a left lower bonding pad and a right lower bonding pad.
Compared with the product structure in the prior art, the utility model has the following advantages:
the current and the conducting direction of the small-size surface-mounted circuit protection component are changed from a vertical structure to a left-right structure, so that the small-size surface-mounted circuit protection component is more suitable for miniaturization and microminiaturization of products, and can produce 0201 and smaller-size surface-mounted products; in addition, the polymer positive temperature coefficient material (PPTC material) in the product is protected in the insulating protective layer, is not influenced by environmental factors, and has better weather resistance.
Drawings
Fig. 1 is a structural sectional view of a circuit protection device of the present invention.
Fig. 2 is an exploded view of the circuit protection device according to the present invention (upper and lower pads are omitted).
Fig. 3 is a structural assembly diagram of the circuit protection device of the present invention (upper and lower pads are omitted).
Fig. 4 is a schematic structural diagram of the upper electrode of the present invention.
Fig. 5 is a schematic structural diagram of the lower electrode of the present invention.
Detailed Description
It should be understood by those skilled in the art that the present embodiment is only for illustrating the present invention and is not to be used as a limitation of the present invention, and changes and modifications of the embodiment can be made within the scope of the claims of the present invention.
As shown in FIGS. 1-5. An ultra-small-size surface-mounted circuit protection component comprises the following parts: a flat plate-shaped insulating base material 1 made of an insulating composite resin or ceramic sheet; the upper electrode 2 and the lower electrode 3 are made of metal foils and are respectively attached to the upper surface and the lower surface of the insulating base material 1;
the upper electrode 2 is composed of a left upper polar plate 21 and a right upper polar plate 22 which are respectively provided with 2-4 finger-shaped intersections 23 and are insulated from each other; the lower electrode 3 is composed of a left lower polar plate 31 and a right lower polar plate 32 which are respectively arranged at two ends of the insulating base material 1; the left conductive film 4 connects the left upper polar plate 21 and the left lower polar plate 31 together to form a left electrode respectively, and the right conductive film 5 connects the right upper polar plate 22 and the right lower polar plate 32 together to form a right electrode respectively;
a PPTC film 6 made of polymer positive temperature coefficient material is attached to the finger-shaped cross 23 area of the upper electrode 2, and the left electrode and the right electrode are connected together to form a device with overcurrent and overtemperature protection functions;
the insulating protective layer 7 is attached to the upper surface of the PPTC film 6, and the polymer positive temperature coefficient material is protected from the influence of the external environment, temperature, humidity and sensitive gas of the positive temperature coefficient material, so that the device is ensured to have better weather resistance.
Preferably, left and right upper pads 81 and 82 are provided on the uncovered portions of the left and right upper plates 21 and 22, and left and right lower pads 91 and 92 are provided on the outer surfaces of the left and right lower plates 31 and 32.
Preferably, the insulating base material 1 is made of an insulating composite resin or a ceramic sheet. The insulating composite resin 1 is made of one of phenolic resin, epoxy resin, polyimide resin, polytetrafluoroethylene resin, bismaleimide triazine resin, thermosetting polyphenylene ether resin and polyester resin.
Preferably, the upper electrode 2 and the lower electrode 3 are both made of metal foils; the metal foil is copper foil or silver foil.
Preferably, the left conductive film 4 and the right conductive film 5 are planar, semi-circular hole shaped, semi-elliptical hole shaped, rectangular hole shaped or square hole shaped, and are formed by metal plating.
The thickness of the PPTC film 6 is 0.05-0.15 mm.
Preferably, the polymeric positive temperature coefficient material comprises a high molecular polymer matrix, and a conductive filler and a non-conductive filler which are dispersed in the high molecular polymer matrix; the high molecular polymer is selected from one of crystalline or semi-crystalline polyolefin, ethylene-ester copolymer and fluorine-containing polymer; the conductive filler is one of carbon black, graphene powder, carbon nano tube micro powder and conductive ceramic powder; the non-conductive filler is a composition of nano silicon dioxide and an inorganic flame-retardant filler.
The polyolefin may be exemplified by polyethylene, polypropylene, or a copolymer of ethylene and propylene; the ethylene-ester copolymer may be exemplified by ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, ethylene-butyl acrylate copolymer; the fluoropolymer may be, for example, polyvinylidene fluoride or ethylene/tetrafluoroethylene copolymer.
Preferably, the insulating protective layer 7 is made of epoxy resin, polyamide resin, polytetrafluoroethylene resin, or polyester resin.
Claims (7)
1. A small-size surface-mounted circuit protection component comprises the following parts: a flat plate-shaped insulating base material (1); the upper electrode (2) and the lower electrode (3) are respectively attached to the upper surface and the lower surface of the insulating base material (1); it is characterized in that the preparation method is characterized in that,
the upper electrode (2) is composed of a left upper polar plate (21) and a right upper polar plate (22) which are respectively provided with 2-4 finger-shaped intersections (23) and are insulated from each other; the lower electrode (3) is composed of a left lower polar plate (31) and a right lower polar plate (32) which are respectively arranged at two ends of the insulating base material (1); the left conductive film (4) connects the left upper polar plate (21) and the left lower polar plate (31) together to form a left electrode, and the right conductive film (5) connects the right upper polar plate (22) and the right lower polar plate (32) together to form a right electrode; a PPTC film (6) made of polymer positive temperature coefficient material is attached to the finger-shaped cross (23) area to connect the left electrode and the right electrode together; and an insulating protective layer (7) is attached to the upper surface of the PPTC film (6).
2. A small-sized surface-mounted circuit protection component as claimed in claim 1, wherein a left upper pad (81) and a right upper pad (82) are provided on the uncovered surface of said upper electrode (2), and a left lower pad (91) and a right lower pad (92) are provided on the surface of the lower electrode.
3. A small-sized surface-mounted circuit protection component as claimed in claim 1, wherein said insulating base material (1) is made of an insulating composite resin or ceramic sheet.
4. A small-sized surface-mounted circuit protection component as claimed in claim 1, wherein said upper electrode (2) and said lower electrode (3) are made of metal foil.
5. The small-sized surface-mounted circuit protection component as claimed in claim 1, wherein the left conductive film (4) and the right conductive film (5) are planar, semi-circular hole-shaped, semi-elliptical hole-shaped, rectangular hole-shaped or square hole-shaped and are formed by metal plating.
6. The small-sized surface-mounted circuit protection component as claimed in claim 1, wherein the thickness of the PPTC film (6) is 0.05-0.15 mm.
7. A small-sized surface-mounted circuit protection component as claimed in claim 1, wherein said insulating protection layer (7) is made of one of epoxy resin, polyamide resin, polytetrafluoroethylene resin or polyester resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122489261.2U CN216353618U (en) | 2021-10-15 | 2021-10-15 | Small-size surface mounting circuit protection component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122489261.2U CN216353618U (en) | 2021-10-15 | 2021-10-15 | Small-size surface mounting circuit protection component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216353618U true CN216353618U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122489261.2U Active CN216353618U (en) | 2021-10-15 | 2021-10-15 | Small-size surface mounting circuit protection component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216353618U (en) |
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2021
- 2021-10-15 CN CN202122489261.2U patent/CN216353618U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240112 Address after: Room 217, 2nd Floor, Building 2, No. 9 Xinteng Road, Xinqiao Town, Songjiang District, Shanghai, 2016 Patentee after: Shanghai Futongbao Electronic Technology Co.,Ltd. Address before: 101100 101-1707, floor 7, building 1, No. 55, Jiachuang Second Road, Tongzhou District, Beijing Patentee before: Beijing Futong Electronic Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |