CN217507253U - Protective element with cover - Google Patents

Abstract

The utility model relates to a protection element with a cover body, comprising a base and a cover body, a low melting point alloy layer is arranged on the base body, an accommodating groove and a guideway are arranged on the cover body, and the guideway corresponds to the low melting point alloy In the fusing area of the layer, the flux point is set on the accommodating groove of the cover body. When the flux is melted, it flows into the guide channel along the accommodating groove, so that the flux can be maintained on the fusing area of the low-melting alloy layer. Therefore, it is only necessary to place the flux in the accommodating groove during manufacture, which can effectively reduce the manufacturing steps and thus reduce the production cost.

Description

Protective element with cover

technical field

The utility model relates to a protection element, which refers to a protection element used for connecting with other electronic elements in a circuit to provide protection effect against instantaneous overcurrent.

Background technique

The charging circuit is usually provided with a protection element, so that the protection element can cut off the charging circuit of the charging circuit and protect the charging circuit when abnormal conditions such as overcurrent or overvoltage occur in the charging circuit. The protection element in the prior art includes a low-melting alloy layer disposed on the body, and the low-melting alloy layer is connected to the electrode layer. When the circuit is connected, the current passes through the electrode layer to pass through the low-melting alloy layer. When overcurrent or overvoltage occurs, The low melting point alloy layer will be fused due to overheating to open the circuit to protect the circuit.

In the prior art, the low melting point alloy layer is mostly coated with a flux. The flux can not only help the low melting point alloy layer melt, but also generally protect the low melting point alloy layer from being oxidized. However, it is often time-consuming and labor-intensive to uniformly coat the flux on the low-melting alloy layer, so the prior art does have its place for improvement.

Utility model content

In view of this, the present invention improves the structure of the protection element, in order to save time and effort to uniformly coat the flux on the low melting point alloy layer.

In order to achieve the purpose of the utility model, the utility model provides a protection element, which includes:

an ontology, the ontology includes:

a base, which is an electrically insulating material and has a first surface and a second surface;

an interconnecting layer formed on the first surface of the base;

an outer connection layer formed on the second surface of the base and electrically connected to the inner connection layer;

a low melting point alloy layer, which is disposed on the first surface of the base and is electrically connected with the internal connection layer, and has at least one fuse region on the low melting point alloy layer;

a cover, which is covered on the main body, the inner side of the cover is provided with an accommodating groove and at least one guideway, the accommodating groove communicates with the guideway, and each guideway corresponds to the low One of the fuse regions of the melting point alloy layer;

A flux is set in the accommodating groove of the cover. When the temperature of the protection element begins to rise, the flux enters a molten state and flows into the guide channel from the accommodating groove, so that the flux can be set accordingly on the fuse region of the low melting point alloy layer.

In the above protection element, the number of the guide channels of the cover body is two, and the two guide channels are respectively provided on both sides of the accommodating groove.

In the above protection element, the guide channels are arranged in parallel, and the guide channels are arranged perpendicular to the accommodating groove.

In the above protection element, the accommodating groove is composed of two side retaining walls and an accommodating space, the two side retaining walls are respectively arranged on both sides of the accommodating space, and each of the passages includes a convex rib, The protruding rib is vertically arranged at one end of the side retaining wall, the protruding rib has a stepped portion, the stepped portion is adjacent to the accommodating space of the accommodating groove and communicates with it, and the stepped portion is far from the accommodating space. The side of the space is a long side wall.

In the above protection element, the thickness of the short wall of the protruding rib adjacent to the side retaining wall is smaller than the thickness of the side retaining wall.

The above protection element further includes a heat generating layer, the heat generating layer is embedded in the base and covered by the base, and the heat generating layer is electrically connected with the external connection layer and the low melting point alloy layer.

Above-mentioned protection element, it further comprises a heating electrode unit, and this heating electrode unit forms electrical connection with this heating layer, this external connection layer and this low melting point alloy layer respectively, and this heating layer passes through this heating electrode unit and this external connection layer and the low melting point alloy layer to form an electrical connection.

The above-mentioned protection element, wherein the heating electrode unit comprises an inner heating electrode and an outer heating electrode, the inner heating electrode is arranged on the first surface of the base, the low melting point alloy layer is covered on the inner heating electrode, the The inner heating electrode is respectively electrically connected with the heating layer and the low melting point alloy layer, the outer heating electrode is arranged on the second surface of the base, and the outer heating electrode is electrically connected with the heating layer and the outer connecting layer respectively .

The above protection element, wherein the inner connection layer includes two inner loop electrodes, which are respectively disposed on the first surface and adjacent to the two long sides, and the outer connection layer includes two outer loop electrodes, which are respectively disposed on the first surface. The two surfaces are adjacent to the two long sides and are respectively electrically connected to the inner loop electrodes. The low melting point alloy layer bridges the two inner loop electrodes. The number of fuse regions of the low melting point alloy layer is two. , respectively adjacent to the two inner loop electrodes.

The above protection element, wherein the inner connection layer includes two inner loop electrodes, which are respectively disposed on the first surface and adjacent to the two long sides, and the outer connection layer includes two outer loop electrodes, which are respectively disposed on the first surface. The two surfaces are adjacent to the two long sides and are respectively electrically connected to the inner loop electrodes. The low melting point alloy layer bridges the two inner loop electrodes. The number of fuse regions of the low melting point alloy layer is two. , respectively adjacent to the two inner loop electrodes.

The advantage of the utility model lies in that, by virtue of the design of the accommodating groove and the guideway on the cover body, the flux can be maintained on the fuse area of the low melting point alloy layer in a molten state, and only the flux needs to be added during production. If the dots are arranged on the accommodating groove, the production steps can be effectively reduced, and the production steps and costs can be saved.

In order to have a better understanding of the above-mentioned and other aspects of the present invention, the following examples are given and described in detail with the accompanying drawings, but are not intended to limit the present invention.

Description of drawings

Fig. 1 is the perspective view of the utility model;

Fig. 2 is the component exploded view of the utility model;

Fig. 3 is the sectional view of the base in Fig. 2 along the A-A section line;

Fig. 4 is the sectional view of the base in Fig. 2 along the B-B secant line;

FIG. 5 is an exploded view of components from another perspective of the present invention;

Figure 6 is a side sectional view of the utility model before the flux is not melted;

Fig. 7 is the end sectional view of the utility model before the flux is not melted;

Figure 8 is a side sectional view of the utility model after the flux is melted;

Fig. 9 is the end sectional view of the utility model after the flux is melted;

FIG. 10 is a perspective perspective view of the present invention after the flux is melted, wherein the cover is transparent.

Among them, reference numerals:

10: Main body 11: Base

111: First surface 112: Second surface

12: Internal connection layer 121: Internal return electrode

13: External connection layer 131: External return electrode

14: Heating layer 15: Low melting point alloy layer

151: Fusing zone 16: Heating electrode unit

161: Inner heating electrode 162: Outer heating electrode

20: Cover 21: Inner side

22: Receiving slot 221: Side retaining wall

222: accommodating space 23: approach road

231: Rib 232: Class Department

233: Low Wall 234: Long Wall

30: Flux

Detailed ways

The technical means adopted by the present invention to achieve the intended purpose of the present utility model will be further described below in conjunction with the accompanying drawings and the embodiments of the present utility model. Therefore, the elements shown in the figures are not presented in the actual number, actual shape, actual size and actual ratio, and the size or size ratio has been exaggerated or simplified, thereby To provide a better description, the actual number, actual shape, or actual size ratio has been selectively designed and configured, while the detailed component layout may be more complex.

Please refer to FIG. 1 , the present invention includes a main body 10 and a cover body 20 .

Referring to FIGS. 1 to 4 , the aforementioned body 10 includes a base 11 , an inner connection layer 12 , an outer connection layer 13 , a heat generating layer 14 , and a low melting point alloy layer 15 . The base 11 is made of a single electrically insulating material, and includes a first surface 111 and a second surface 112 . The interconnection layer 12 is formed on the first surface 111 of the base 11 . The outer connection layer 13 is formed on the second surface 112 of the base 11 and is electrically connected to the inner connection layer 12 , and the outer connection layer 13 is used to form an electrical connection with an external charging circuit. The heat generating layer 14 is embedded in the base 11 and covered by the base 11 , and the heat generating layer 14 is electrically connected to the external connection layer 13 . The low melting point alloy layer 15 is formed on the first surface 111 of the base 11 and is electrically connected to the internal connection layer 12 and the heat generating layer 14 . The low melting point alloy layer 15 has at least one fuse region 151 . The fuse region 151 is adjacent to the electrical connection with the interconnection layer 12 .

In one embodiment, the inner connection layer 12 includes two inner loop electrodes 121 , which are respectively disposed on the first surface 111 adjacent to the two long sides, and the outer connection layer 13 includes two outer loop electrodes 131 . They are respectively disposed on the second surface 112 adjacent to the two long sides, and are respectively electrically connected to the inner loop electrodes 121 . The low melting point alloy layer 15 bridges the two inner loop electrodes 121 . The number of fuse regions 151 of the alloy layer 15 is two, which are adjacent to the two inner loop electrodes 121 respectively. When the outer connecting layer 13 is connected to the external charging loop through the outer loop electrode 131, the current flows through the outer loop electrode 131, the inner loop electrode 131, the inner loop electrode 131, and the inner loop electrode 131. The return electrode 121 and the low melting point alloy layer 15 form a via.

Please refer to FIG. 2 and FIG. 5 to FIG. 7 , the cover body 20 is covered on the main body 10 , and the inner side surface 21 of the cover body 20 is provided with an accommodating groove 22 and at least one guide channel 23 . The accommodating groove 22 is communicated with the lead channels 23, each lead channel 23 corresponds to one of the fuse regions 151 of the low melting point alloy layer 15, a flux 30 is set in the accommodating groove 22, and the flux 30 is viscous For a substance with a high degree of temperature, when the overall temperature begins to rise after power-on, the flux 30 enters a molten state (as shown in Figures 8 to 10 ). Therefore, the flux 30 can be naturally disposed on the fusing area 151 of the low melting point alloy layer 15 to protect the low melting point alloy layer 15 and promote the effective fusing of the fusing area 151 . In one embodiment, the number of the passages 23 of the cover body 20 is two, the two passages 23 are respectively located on both sides of the accommodating groove 22, and each passage 23 corresponds to one of the fuse regions 151, The two guideways 23 are arranged in parallel and perpendicular to the accommodating groove 22 , and the length of each guideway 23 is greater than the length of the accommodating groove 22 .

In one embodiment, the accommodating groove 22 is composed of two side retaining walls 221 and an accommodating space 222 , the two side retaining walls 221 are respectively disposed on both sides of the accommodating space 222 , and each channel 23 includes a convex A rib 231, the protruding rib 231 is vertically arranged at one end of the side wall 221, the protruding rib 231 has a first-level portion 232, that is, a continuous groove with different thicknesses, so that the protruding rib 231 is adjacent to the The thickness of the short wall 233 of the side blocking wall 221 is smaller than the thickness of the side blocking wall 221, the stepped portion 232 is adjacent to the accommodating space 222 of the accommodating groove 22 and communicates with it, and the stepped portion 232 is far from the accommodating space 222. One side of the space 222 is a long side wall 234 . Please refer to FIGS. 8 to 10 , the side retaining walls 221 and the accommodating space 222 are helpful for easy alignment when the flux 30 is placed, and the initial position of the flux 30 is maintained. When the flux 30 begins to melt, When the accommodating space 222 flows into the stepped portion 232 (as shown in FIGS. 8 to 10 ), the long sidewalls 234 can effectively control the flow of the flux 30 , so that the flux 30 can be maintained on the fuse region 151 . In one embodiment, the lower edge of the long sidewall 234 can be a continuous arc portion, and when the long sidewall 234 is close to the low melting point alloy layer 15, the lower edge of the continuous arc portion can reduce the contact area to avoid damage to the low melting point alloy layer 15. The alloy layer 15 causes damage.

When the external charging circuit starts to operate, the current is introduced from the external connection layer 13 and flows through the internal connection layer 12 and the low melting point alloy layer 15 , because the fuse region 151 is adjacent to the connection between the internal connection layer 12 and the low melting point alloy layer 15 . Therefore, when an overcurrent situation occurs and the circuit temperature rises, the fuse area 151 first responds to the temperature rise, and the flux 30 is effectively maintained on the fuse area 151 through the setting of the lead channel 23, which can help the fuse area 151 to accelerate the fuse , and can quickly achieve the circuit breaker effect to protect the external charging circuit.

In one embodiment, please refer to FIG. 2 to FIG. 4 , the heating layer 14 is electrically connected to a heating electrode unit 16 , and the heating electrode unit 16 is respectively formed with the external connection layer 13 and the low melting point alloy layer 15 . Electrically connected, so that the current of the external charging circuit flows through the heating layer 14, so that the heating layer generates heat, so that the heating layer 14 embedded in the base 11 can store heat, and transmit the heat to the base 11 through the base 11. The low melting point alloy layer 15 is used to accelerate the effect of overheating and fusing of the low melting point alloy layer 15 . In one embodiment, the heating electrode unit 16 includes an inner heating electrode 161 and two outer heating electrodes 162, the inner heating electrode 161 is disposed on the first surface 111 of the base 11, and the low melting point alloy layer 15 covers the Thereon, the inner heating electrode 161 is electrically connected to the heating layer 14 and the low melting point alloy layer 15 respectively, and the outer heating electrode 162 is respectively disposed on the first surface 111 and the second surface 112 of the base 11 ( Or an outer heating electrode 162 is arranged on the second surface 112), the outer heating electrode 162 forms an electrical connection with the heating layer 14 and the outer connecting layer 13 respectively, then the current of the external charging loop flows into the outer connecting layer 13 The heating layer 14 constitutes a heating circuit by the outer heating electrode 162 , the heating layer 14 , the inner heating electrode 161 and the low melting point alloy layer 15 .

In one embodiment, the electrical connection between the outer loop electrode 131 and the inner loop electrode 121 , the electrical connection between the inner heating electrode 161 and the heating layer 14 , the outer heating electrode 162 and the outer connecting layer 13 The electrical connection with the heat generating layer 14 is constituted by a plurality of conductive through holes provided in the base 11 .

The above descriptions are only the embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Those of ordinary knowledge, within the scope of the technical solution of the present invention, can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above, provided that the content of the technical solution of the present invention is not departed from , any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. A protection element, characterized in that it comprises: an ontology, the ontology includes: a base, which is an electrically insulating material and has a first surface and a second surface; an interconnecting layer formed on the first surface of the base; an outer connection layer formed on the second surface of the base and electrically connected to the inner connection layer; A low melting point alloy layer, which is disposed on the first surface of the base and is electrically connected to the internal connection layer, the low melting point alloy layer has at least one fuse area, and each of the fuse areas is adjacent to the low melting point where the alloy layer is connected to the inner connecting layer; a cover, which is covered on the main body, the inner side of the cover is provided with an accommodating groove and at least one guideway, the accommodating groove communicates with the guideway, and each guideway corresponds to the low One of the fuse regions of the melting point alloy layer; A flux is set in the accommodating groove of the cover. When the temperature of the protection element begins to rise, the flux enters a molten state and flows into the guide channel from the accommodating groove, so that the flux can be set accordingly on the fuse region of the low melting point alloy layer. 2 . The protection element according to claim 1 , wherein the number of the guide channels of the cover body is two, and the two guide channels are respectively provided on both sides of the accommodating groove. 3 . 3 . The protection element according to claim 2 , wherein the guideways are arranged in parallel, and the guideways are arranged perpendicular to the accommodating groove. 4 . 4 . The protection element of claim 3 , wherein the accommodating slot is composed of two side retaining walls and an accommodating space, and the two side retaining walls are respectively disposed on both sides of the accommodating space. 5 . , each of the passages includes a protruding rib, the protruding rib is vertically arranged at one end of the side retaining wall, the protruding rib has a stepped portion, and the stepped portion is adjacent to the accommodating space of the accommodating groove and is In communication with it, the side of the stepped portion away from the accommodating space is a long side wall. 5 . The protection element of claim 4 , wherein the thickness of the short wall of the protruding rib adjacent to the side wall is smaller than the thickness of the side wall. 6 . 6. The protection element according to any one of claims 1 to 5, characterized in that, it further comprises a heat generating layer, the heat generating layer is embedded in the base and covered by the base, and the heat generating layer is An electrical connection is formed with the external connection layer and the low melting point alloy layer. 7 . The protection element according to claim 6 , further comprising a heating electrode unit, the heating electrode unit is respectively electrically connected to the heating layer, the external connection layer and the low melting point alloy layer, and the heating electrode unit is electrically connected. 8 . The layer is electrically connected to the external connection layer and the low melting point alloy layer through the heating electrode unit. 8. The protection element of claim 7, wherein the heating electrode unit comprises an inner heating electrode and an outer heating electrode, the inner heating electrode is disposed on the first surface of the base, the low melting point The alloy layer is covered on the inner heating electrode, the inner heating electrode is electrically connected with the heating layer and the low melting point alloy layer, the outer heating electrode is arranged on the second surface of the base, and the outer heating electrode is respectively connected with the heating layer and the low melting point alloy layer. The heat generating layer and the external connection layer are electrically connected. 9 . The protection element according to claim 1 , wherein the inner connection layer comprises two inner loop electrodes, which are respectively disposed on the first surface adjacent to the two long sides, 10 . The outer connection layer includes two outer loop electrodes, which are respectively disposed on the second surface adjacent to the two long sides, and are respectively electrically connected to the inner loop electrodes. The low melting point alloy layer bridges the two long sides. There are two inner loop electrodes, and the number of fuse regions of the low melting point alloy layer is two, which are respectively adjacent to the two inner loop electrodes. 10 . The protection element of claim 8 , wherein the inner connection layer comprises two inner loop electrodes, which are respectively disposed on the first surface adjacent to the two long sides, and the outer connection layer comprises 10 . 10 . Two outer loop electrodes are respectively disposed on the second surface adjacent to the two long sides, and are respectively electrically connected to the inner loop electrodes, the low melting point alloy layer is connected across the two inner loop electrodes, the The number of fusing regions of the low melting point alloy layer is two, which are respectively adjacent to the two inner loop electrodes.

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