TW201137914A - Protective device and electronic device - Google Patents

Abstract

A protective device includes a substrate, an upper electrode, a lower electrode, an end electrode, a heater, a metal block and at least a bridge line. The substrate has a first surface and an opposite second surface. The upper electrode is disposed on the first surface of the substrate and includes a first sub-electrode, a third sub-electrode and a fourth sub-electrode. The lower electrode is disposed on the second surface of the substrate. The end electrode connects the upper electrode and the lower electrode. The heater is disposed on the substrate and electrically connects to the first sub-electrode. The metal block is disposed on the first surface of the substrate and connects the third sub-electrode and the fourth sub-electrode. The bridge line is disposed above the metal block and partly connects to the metal block. A first end of the bridge line is fixed on the first sub-electrode. The bridge line and the first sub-electrode are overlapped with at least a portion in their orthogonal projections on the first surface.

Description

201137914 3^98jtwf.doc/n VI. Description of the Invention: [Technical Field] The present invention relates to a 70-piece application in an electronic device, and particularly relates to preventing overcurrent and overvoltage保保# ° [Previous technology] _ In recent years, 'information technology has advanced by leaps and bounds. Information products such as mobile phone assistants can be seen everywhere. With their help, people can eat, clothing, live, travel, education and music in their lives. In terms of the dependence and increase of people's dependence on information products. However, when the battery of a portable electronic product such as a mobile phone is charged and discharged, it is too much. Therefore, the industry began to strengthen the battery charging and discharging: to prevent the battery from overvoltage or over-charging during charging and discharging: The thermal fuse in the protection mode of the protective element proposed by the prior art is connected in series with the circuit of the battery, and The fuse and the heating are connected to the field effect crystal ^ β heating to sever the temperature fuse, so that the battery is defeated, and the state is protected by the electric house. In addition, when an overcurrent occurs, a large ί = temperature fuse will heat the temperature fuse and dissolve the flow. The private circuit is in an open state. 201137914 1 - TW 33983twf.doc / n Figure 1 is a schematic cross-sectional view of a conventional thermal fuse package. Referring to FIG. 1, a conventional thermal fuse package 100 has two substrates 110, a heater 120, an insulating layer 130, a metal layer 14A, and a = solder ISO. The heater m is disposed on the substrate 11 and electrically connects the two heater electrodes 125. The insulating layer 130 covers the heater 12 and the heater electrode 12 = the metal layer 140 is disposed on the insulating layer 13 , and the flux 'is completely covered Metal layer 140. In this manner, the heater 12 is heated to directly melt the metal layer 140 so that the metal layer 14G is condensed and flows toward the heater, the electrode layer 160 on both sides of the 12 和, and the intermediate electrode 165. However, since the surface of the metal layer M0 is easily oxidized, if the flux ISO is not completely covered with the metal layer (10), the metal layer (10) of the county may cause a phenomenon arcing between the electrode layers 160 and the intermediate electrode 165, which is evil. The method ensures that there is a requirement for the voltage drop of the Wei. In order to reduce the arcing=image generation and improve the stability of the overvoltage protection, f also controls the cross-sectional area of the metal layer 140, the size of the area of the intermediate electrode 165, and the spacing between the electrode layer 16〇 and the intermediate electrode 165. Or the metal layer 14 () and the equivalent parameters 'cause the product size reduction design restrictions: over ^ dissolution and guilty decline and other issues. SUMMARY OF THE INVENTION This I month provides a kind of thin-skinning component, which can effectively prevent overcurrent and over-current. The invention provides an electronic device capable of effectively preventing overcurrent and overvoltage. It has the above-mentioned protection component, 201137914 KJj-uyyuui- TW 33983 twf.doc/n The invention proposes a protective element comprising a substrate, an upper electrode, a lower electrode, a terminal electrode, a heater, a metal block and at least one bridge wire. The substrate has a first surface and a second surface opposite to each other. The upper electrode is disposed on the first surface of the substrate. The upper electrode includes a sub-electrode and a third sub-electrode and a fourth sub-electrode opposite to each other. The lower electrode is disposed on the second surface of the substrate. The terminal electrode is connected to the upper electrode and the lower electrode. The heater is disposed on the substrate and electrically connected to the first sub-electrode. And the metal block is disposed on the first surface of the substrate, and connects the third sub-electrode and the fourth sub-electrode. The bridge wire is disposed above the metal block and partially in contact with and has a first end and a second end opposite to each other. The first end of the bridge wire is fixed to the first sub-electrode. The positive projection of the bridge wire on the first surface of the substrate at least partially overlaps the orthographic projection of the first sub-electrode on the first surface of the substrate. The present invention also provides a protective component comprising a substrate, an upper electrode, a lower electrode, an end electrode, a heater, a metal block, at least one bridge wire, and an auxiliary medium. The substrate has a first surface and a first surface opposite to each other. The upper electrode is disposed on the first surface of the substrate. The upper electrode includes a first sub-electrode and a third sub-electrode and a fourth sub-electrode opposite to each other. The lower electrode is disposed on the second surface of the substrate. The terminal electrode is connected to the upper electrode and the lower electrode. The heater is disposed on the substrate and electrically connected to the first sub-electrode. The metal block is disposed on the first surface of the substrate and connects the third sub-electrode and the fourth sub-electrode. The bridge wire is disposed above the metal block and has a first end and a second end opposite to each other. The first end of the bridge wire is fixed to the first sub-electrode. The orthographic projection of the bridge wire on the first surface of the substrate and the positive input of the first sub-surface of the substrate on the substrate n are disposed between the bridge wire and the metal block. y邙 knows $. Auxiliary media The present invention also provides an electronic device, a protective component, a battery, and a __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - When the voltage is over-voltage, the detection controller will provide the heater and the heater will be energized. 'Hard the metal r; the heater heats up and the metal block appears. (10) 夂 =: This is: : = force? Capillary phenomenon The bridging of the contact == the extension of the extension of the brother, so that the reach can be effectively prevented from overvoltage or overcurrent. The above described features and advantages of the present invention will become more apparent from the following description. [Embodiment] Fig. 2A is a plan view showing a protective element according to an embodiment of the present invention. 2A is a bottom view of the protection element of FIG. 2A. Figure 2C is a cross-sectional view of the protective element of Figure 2 along the line μ. Figure m is a cross-sectional view of the protection element of Figure 2A along the line. Referring to FIG. 2A, FIG. 2B, FIG. 2C and FIG. 2D, in the embodiment, the protection component 200a includes a substrate 210, an upper electrode 22, a lower electrode 230, an end electrode 240, a heater 250, and a first A co-solvent 260, a metal block 270, and at least one bridge wire 280 (only one of the schematic edges 201137914 33983 twf.doc/n is shown in Figure 2A). In detail, the substrate 210 has a first surface 212 and a second surface 214 opposite to each other and a side surface 216 connecting the first surface 212 and the second surface 214. In this embodiment, the material of the substrate 210 includes ceramics (such as alumina), plastic fllom, glass epoxy, cerium oxide (Zr〇2), tantalum nitride (Si3N4), aluminum nitride. (a1N), nitrided butterfly (BN) or other inorganic materials. The upper electrode 220 is disposed on the first surface 212 of the substrate 210 and has a first sub-electrode 222 and a second sub-electrode 224 opposite to each other and a third sub-electrode 226 and a fourth sub-electrode 228 opposite to each other. It should be noted that in other embodiments, the upper electrode 22〇 may not include the second sub-pole 224 and does not affect the overcurrent and over-voltage protection effects. Preferably, the first sub-electrode 222 further has a body portion 222a and a first extension portion 222b connected to the body portion 22, wherein the first extension portion 222b is located at the second sub-electrode 226 and the fourth sub-electrode 228. between. The lower electrode 230 is disposed on the second surface 214 of the substrate 210. The terminal electrode 240 is connected to the upper electrode 220 and the lower electrode 23, and covers the two side surfaces 216 of the substrate 21A. In this embodiment, the material of the upper electrode 22 〇 and the lower electrode 23 电极 ^ electrode 240 is, for example, a silver paste, a multilayer stack of gold and gold, and may also have good electrical conductivity, such as alloy, nickel alloy, copper, tin, etc. Material to replace. In the present embodiment, the heater 25 is disposed on the second surface 21 of the substrate 21, and is connected to the lower electrode 230. The lower electrode 230 has a seventh sub-electrode 236 and a sixth sub-electrode 236 opposite to each other, a fifth sub-electrode 232 and a sixth sub-electrode 234, and opposite to each other. The fifth sub-electrode 232, the sixth sub-electrode 234, the seventh sub-electrode 236, and the eighth sub-electrode 238 are sequentially disposed corresponding to the first sub-electrode 222, the second sub-electrode 224, the third sub-electrode 226, and the fourth sub-electrode 228. . The fifth sub-electrode 232 has a second extension 232a, and the sixth sub-electrode 234 has a third extension 234a. The second extension portion 232a and the third extension portion 234a are located between the seventh sub-electrode 236 and the eighth sub-electrode 238 and are parallel to each other and do not overlap, and the heater 25 is connected to the second extension portion 232a and the third extension portion. Between 234a. However, in other embodiments, the heater 250 can also be directly connected between the fifth sub-electrode 232 and the sixth sub-electrode 234 without the second extension 232a and the third extension 234a. In still another embodiment, the heating state 250 can also be disposed on the first surface 212 of the substrate 210 and connected between the first sub-electrode 222 and the second sub-electrode 224 of the upper electrode 220 (not shown). ). Further, in the present embodiment, the material of the heater 25A includes ruthenium oxide (Ru〇2), ίcarbon black (which may be doped with an inorganic adhesive such as water glass or an organic adhesive such as a thermosetting resin). Medium), copper, titanium, nickel-chromium alloy and nickel-copper alloy can be formed by thick film printing, sputtering, press-fitting or thin film lithography, respectively. Further, in order to protect the heater 25 from contamination or oxidation by the external environment, the heater 25 may be covered with an insulating layer 294' which is made of glass paste or epoxy resin. The first flux 260 is disposed on the first surface 212 of the substrate 210 and between the first extension portion 222b and the third sub-electrode 226, and between the first extension portion 222b and the fourth sub-electrode 228. In the present embodiment, the young solvent 260 is composed of rosin, a softener, an active agent (active 201137914 ^ * a W j: 983 twf. doc/n agent), and a synthetic rubber. The metal block 270 is disposed on the first surface 212 of the substrate 210 and is connected to the third sub-electrode 226, the first extension portion 222b and the fourth sub-electrode 228.

Specifically, the metal block 270 covers a portion of the third sub-electrode 226, the first flux 260, the first extension 222b, and the fourth sub-electrode 228. When the heater 250 is heated to cause the first flux 260 and the metal block 270 to be in a molten state, the first flux 260 can prevent the surface of the metal block 27 from being heated and melted to generate an oxide film when placed or generally passed through. Therefore, it is possible to improve the effect of ensuring that the metal block 270 is blown. In addition, the material of the metal block 270 of the present embodiment includes a low melting point alloy such as a tin-lead alloy, a tin-silver-lead alloy, a tin-indium-bismuth-lead alloy, a tin-recorded alloy, or a tin-silver-copper alloy.

The protective element 2〇〇a of the present invention includes a bridge wire 280, wherein the bridge wire 280 is disposed above the metal block no and partially contacts the metal field 270, and has a first end and a second end opposite to each other. In particular, the first end 282a of the bridge wire 280 is fixed to the ancestor 4 222a of the first sub-electrode 22: However, the first end 282a of the bridge wire 28〇 can also be fixed to the first The first extension 222b of the sub-electrode 222 is connected to the end of the body portion. In addition, the orthographic projection of the bridge wire 280 on the first surface 212 of the substrate 210 at least partially overlaps the orthographic projection of the first extension portion 222b on the first surface 212 of the substrate 21. In other words, the wiring 28 of the present embodiment is bridged over the metal block, and the shape of the bridge wire is, for example, curved. μ ϋ来 % ' In this _, in order to make the bridge 280 play the performance of the father, preferably, the 3 mantle will fix the second end 282b of the bridge 280 10 201137914 —,, 001-TW 33983twf. The first extension 222b of the doc/n second sub-electrode 222 is away from the body portion 222a. That is to say, the first end 282a and the second end of the bridge wire are fixed on the body portion 第一 of the first sub-electrode 222 and the first extension, and the shape of the bridge wire 28 is, for example, Arched. It is worth mentioning that the invention does not limit the shape of the bridge wire, the state of the bridge wire. Although the shape of the bridge wire 28〇 mentioned here is embodied as an arc or an arch, and is embodied as a strip

: 'Please refer to her, the bridge of the protection component class b:::; can also be bent, for example, hat shape or other suitable shape; the protection element island can have two or more bridge wires m bridge wire is It is a technical solution of the present invention to be constructed by the crimping of a plurality of strands (not shown) without departing from the scope of the invention. In the present embodiment, since the bridge wire 280 and the metal block 27A are only partially in contact with each other and the highest point of the bridge wire is spaced apart from the side surface of the metal block (10) away from the substrate 210 by a distance D,

Can be less than or equal to 〇.25 with, recorded, can be between G_ to Q lmm j D Therefore 'can be placed between the bridge wiring and the metal block 27〇 second lining 265' as the guiding metal block 27 The flow medium, the second aid 265 material may be a solder layer or a combination thereof in addition to being used in combination with the first agent. In other words, the material of the first auxiliary solvent, the "co-solvent 265", may be the same or different materials depending on the use requirements. In addition, the second auxiliary solvent 265 disposed between the bridge wire 28 and the metal block 27 is also avoided. The effect of oxidation of the metal block 27. In addition, the bridge 11 201137914 xw-^WJ-TW 33983twf.doc/n the first end 282a of the wiring 280 is connected to the body portion 222a of the first sub-electrode 222 and the second of the bridge line 280 The junction of the end 282b and the first extension 222b of the first sub-electrode 222 may also be coated with a second flux 265 to prevent oxidation of the first end 282a and the second end 282b of the bridge 280 to strengthen the bridge 280. The structural strength of the wood. Since the protective element 2〇〇a of the present embodiment has the bridge wire 280, the molten metal block 270 may be due to surface tension and capillary phenomenon when the heating block 250 is heated to cause the metal block 270 to be in a molten state. For this reason, it is adsorbed on the bridge wire 280 that is in contact with it, and can further flow to the first extension portion 222b to achieve the cut-off circuit to achieve effective prevention of overvoltage or overcurrent. In other words, the molten metal block 270 is passed through Bridge wiring 28〇 Adsorption, it is difficult to conduct the first extension portion 222b and the third sub-electrode 226 or the first extension portion 222b and the fourth sub-electrode 228', so that the protection element 2〇〇& short-circuit phenomenon can be avoided to make it more reliable. It should be noted that in other embodiments, referring to FIG. 3B, the bridge wire 285 may also not contact the metal block 270. In detail, in the example of the figure, the shape of the bridge wire 285 is, for example, a door. The font, wherein the bridge wire 285 is not in contact with the metal block 270, and an auxiliary medium 269 is located between the stomach of the bridge wire 285 and the metal block 270. In the present embodiment, the auxiliary medium 269 is, for example, a co-solvent or a solder layer. When the heater 25 is heated to cause the metal block 270 to be in a molten state, the molten metal block 27 is transferred to the bridge wire which is adsorbed by the auxiliary medium 269 due to the surface tension and fineness. The road is effectively prevented from overvoltage or overcurrent. Further, since the fuse region of the metal block 270 only occurs on the metal block 27〇201137914 33983twf.d〇c/n and the bridge wire 280 on the first surface 212 of the substrate 210 Orthographic projection The overlapping regions and their surroundings, therefore, only need to be disposed between the metal block 27A and the bridge wire 28A to form a surface oxidation resistant layer of the metal block 270. Thus, the surface of the metal block 270 need not be By completely coating the second flux 265, the amount of the second flux 265 can be reduced to reduce the production cost. On the other hand, since the amount of melting of the metal block 270 is reduced, the protective member 2 of the present embodiment can be shortened. 〇a can reduce the time required for the overvoltage protection to act, and can also reduce the molten metal block 27, conducting the first extension 22 沘 and the third sub-electrode 226 or the first extension 222b and the fourth sub-electrode 228 to cause a short circuit. Phenomenon, and the protection element of the embodiment 2 is & and good reliability. In addition, in this embodiment, the material of the bridge wire 280 is, for example, a single genus, a double-layer metal or an alloy, wherein the single metal is, for example, gold, silver, tin, nickel, aluminum or copper, and the double-layer metal is, for example, It is composed of silver, gold or tin coated steel, and the alloy is, for example, a copper-silver alloy, a copper-nickel alloy, a nickel-tin alloy or a copper-nickel-tin alloy, and the invention is not limited thereto. It must be noted here that the outer surface of the bridge wire 280 needs to have better wettability and adsorptivity (for example, solderability) with the molten metal layer 27, thus the bridge wire 280 The material may also be composed of an outer metal layer having good solderability and an inner metal layer having better heat conduction, such as steel silver plating, copper nickel plating, copper tin plating, nickel tin plating, copper gold plating and the like. Since the material of the bridge wire 28 is a metal or an alloy, the bridge wire 280 has a function of dissipating heat, and the heat dissipation effect of the protection element 200a can be improved. In addition, in the present embodiment, the 'protective element 200a further includes a solder 201137914 . . . 33983 twf.doc/n layer 292 at the third sub-electrode 226, the third 222 222b ^ the first application portion 222b On the top, it is not limited to this. The other soldering techniques of gold η: fixed without the solder layer applied to the solder layer 292 (4) can be used to reduce the solder material such as silver alloy, tin-lead alloy.

In order to further ensure that the molten metal block 270 can be adsorbed on the contacted bridge wire and flow to the first extension portion 222b due to the capillary phenomenon of the surface tension disk, the circuit can be realized to effectively prevent over-current [or , Current 'The present embodiment is an experiment for the relationship between the metal block, the bridge wire 28〇, and the first extension 222b of the first-sub-electrode 222. Wherein the region where the first extension portion 222b is located is the effective electrode area, and the length of the metal block 270 in the direction in which the first extension portion 222b extends (the direction is perpendicular to the current direction) is multiplied by the thickness of the metal block. The resulting product is defined as the cross-sectional area of a metal block.

It can be known from Table 1 that when the ratio of the area of the longitudinal section of the bridge wire 280 to the effective electrode area is greater than or equal to 0.36, and the ratio of the area of the longitudinal section of the bridge wire 28 to the cross-sectional area of the metal block is greater than or equal to 26, the heater 25 〇 can surely melt the metal block 270. When the area of the longitudinal section of the bridge wire 280 is larger, the amount of adsorption of the molten metal block 270 is also increased. Moreover, since the size of the metal block 270 determines the cross-sectional area of the metal block, the size of the bridge wire 28 required for the protective element 2A is also required to be larger when the size of the metal block 270 is larger. In addition, since the molten solder layer 292 has better wettability, when the metal block 270 is melted, it will accumulate on the molten solder layer 292, and the molten metal The block 27〇 is adsorbed on the bridge wire 280 that is in contact and flows toward the first extension portion 222b due to surface tension and capillary phenomenon, and it is confirmed that the molten metal does not allow the first extension portion 222b and the third sub-electrode. The 226 or fourth sub-electrode 228 generates a short circuit phenomenon. In this way, it can be further ensured that the metal block 270 can be effectively blown to achieve effective prevention of overcurrent. • In short, when the ratio of the area of the longitudinal section of the bridge wire 280 to the effective electrode area is greater than or equal to 0.36, and the ratio of the area of the longitudinal section of the bridge wire 280 to the cross-sectional area of the metal block is greater than or equal to 2.6, the metal block 2 can be improved. The reliability of Sichuan's effective melting. Since the area of the longitudinal section of the bridge wire 28 of the present embodiment is selected from a specific range of the effective electrode area, and the ratio of the area of the longitudinal section of the bridge wire 280 to the sectional area of the metal block is selected to be a specific range. Therefore, when the protection element 200a is reduced in size for matching the small-sized electronic product, the first extension portion 222b of the first sub-electrode 222 of the upper electrode 22 can also provide a corresponding electrode area and can be appropriately selected. The bridge wire 280 is matched to ensure that the metal block 27 can be quickly blown. In this way, in addition to increasing the range of application of the protective element 2〇〇a, the reliability of the protective element 200a can also be improved. Table experiment number 1 2 3 4 5 6 7 8 Diameter of the bridge wire (mm) 0.127 0.127 0.127 0.127 0.254 0.127 0.127 0.127 Length of the bridge wire (mm) 4.1 4.2 4.3 4.4 4.0 4.3 4.3 4 1 Area of the longitudinal section of the bridge wire ( Mm2) 0.521 0.533 0.546 0.559 1.016 0.546 0.546 0.521 Effective electrode area (mn^) 1.44 1.44 1.44 1.44 1.44 1.44 1.44 1.8 Cross-sectional area of metal block (mm2) 0.2 0.2 0.2 0.2 0.24 0.24 0.3 02 Longitudinal area of the bridge wire and effective electrode 0.362 0.370 0.379 0.388 0.706 0.379 0.379 0.289 15 201137914

Vu 1 -TW 33983twf.doc/n Area ratio The ratio of the area of the longitudinal section of the bridge to the area of the metal block 2.604 2.667 2.731 2.794 4.233 2.275 1.820 2.604 Whether to dissolve OK OK OK OK NG NG NG The protection will be described in detail below. How to make the component 2〇〇a. 4a to 4D are plan views showing the process of the protective element according to an embodiment of the present invention. The component names and reference numerals in FIGS. 4A to 4D are the same as those in FIG. 2 to FIG. 2D, and the materials are the same, and thus will not be described again. For the convenience of description, the process of the second surface 214 of the substrate 21 is omitted in the present embodiment, and the process on the first surface 212 of the substrate 21 is shown only in Figs. 4A to 4D. First, referring to FIG. 4A, a substrate 210 is provided, and an upper electrode 220 is formed on the first surface 212 of the substrate 210. The upper electrode 220 has a first sub-electrode 222 and a second sub-electrode 224 opposite to each other and a third sub-electrode 226 and a fourth sub-electrode 228 opposite to each other. It should be noted that in other embodiments, the upper electrode 22A may not include the second sub-electrode 224' and does not affect the overcurrent and overvoltage protection effects. The first sub-electrode 222 has a body portion 222a and a first extension portion 222b connected to the body portion 222a, wherein the first extension portion 222b is located between the third sub-electrode 226 and the fourth sub-electrode 228. Referring again to FIG. 4A, a solder layer 292 is formed between the third sub-electrode 226, the fourth sub-electrode 228, and the first extension 222b, for example, by coating. Then, a first helper solvent 260 is formed on the substrate 210 between the third sub-electrode 226, the fourth sub-electrode 228, and the first extension portion 222b, for example, by coating. In other embodiments, when the material of the solder layer 292 includes a solder alloy and a fluxing material, for example, 16 201137914~-v"J01-TW 33983twf_doc/n 10 15/. The method of forming the first lubricant 260 includes heating the tantalum layer 292 (eg, 120 t or more) to soften the flux material and flowing to the substrate between the third sub-electrode 226, the fourth electrode 228, and the first extension 222b. 21 〇. Next, referring to FIG. 4B, a metal block 27 is disposed on the third sub-electrode 226, the fourth sub-electrode .228, and the extension portion 2, and the metal block 270 and the solder layer 292 are soldered to be first. The cosolvent is sandwiched between the metal block 280 and the substrate 210. As a result, when the heater 250 of the substrate 21 is heated, the first flux 26 above the substrate 210 can help to melt the metal block 270 thereon. Then, referring to FIG. 4C, the soldering process is performed on the bridge wire 280 through a spot welding machine (not shown) to fix the first end 282 & and the second end 282 b of the bridge wire 28 to the first sub-electrode 222 respectively. The body portion 222 & and the first extension portion 222b. Among them, the soldering method can be performed by solder paste, arc welding, ultrasonic welding, laser welding, thermocompression bonding or welding. Of course, in other embodiments not shown, a bump can also be used to form a bump (that is, the first end 282a of the bridge wire 28 is formed) on the body portion 222a of the first sub-electrode 222. Up, and extending the wire upward for a distance, and then turning the pull-down line onto the first extension 222b of the first sub-electrode 222 (that is, forming the second end 282b of the bridge wire 28〇) is pulled away And the bridge wire 28〇 is formed. Finally, please refer to FIG. 4D, between the metal block 27〇 and the bridge line 28〇, between the first end 282a of the bridge line 280 and the body portion 222a of the first sub-electrode 222, and the second end 282b of the bridge line 280. The second flux 265 is filled between the first extensions 222b of the first sub-electrode 222 17 201137914 . . . -l'W 33983 twf.doc/n, and is heated (for example, 140 C or more). After 30 minutes, the process of protecting the component 200a on the first surface 212 of the substrate 210 is completed by cooling for 5 minutes. Figure 5A is a top plan view of a protective element in accordance with another embodiment of the present invention. FIG. 5B is a bottom view of the protection element of FIG. 5A. Figure 5C is a cross-sectional view of the protective element of Figure 5A taken along line ΙΙΙ-ΙΙΙ. Referring to FIG. 5A, FIG. 5B and FIG. 5C simultaneously, in the present embodiment, the security component 200c of FIGS. 5A to 5C is similar to the protection component 200a of FIGS. 2A to 2D, but the main difference between the two is: The heater 250, the second extension portion 322c, and the third extension portion 324a of the protection element 200c of FIG. 5C are disposed on the first surface 212 of the substrate 210, and the design of the electrode 320 above the protection element 2〇〇c is different. The design of the electrode 220 above the previous embodiment. . In detail, in the embodiment, the first sub-electrode 322 of the upper electrode 32A further has a second extending portion 322c and a joint portion 323, wherein the joint portion 323 is connected to the first extending portion 322b, and the bridge wire 280 is The second end 282b is fixed to the joint portion 323. The second sub-electrode 324 has a third extension 324a. The second extension portion 322c and the third extension portion 324a are disposed between the third sub-electrode 326 and the fourth sub-electrode 328 ′ while the heater 250 is located on the first surface 212 of the substrate 210 and connects the second extension portion 322c and the third portion. Extension 324a. The insulating layer 294 is disposed between the first extending portion 322b and the second extending portion 322c and the third extending portion 324a, that is, the first extending portion 322b is located on a surface of the insulating layer 294, and the second extending portion 322c and the third portion The extensions 324a are located on the other opposing surface of the insulating layer 294. In particular, the orthographic projections of the first extension portion 322b, the second extension portion 322c, and the third extension portion 324a on the insulating layer 294 do not overlap each other. In addition, the first flux 260 is disposed on the insulating layer 294 and between the first extension portion 322b and the third sub-electrode 326, and between the first extension portion 322b and the fourth sub-electrode 328. The metal block 27 covers a portion of the second sub-electrode 326, the first flux 260, the first extension 322b, and the fourth sub-electrode 328 such that the first flux 260 is between the metal layer 27 and the insulating layer 294. In this way, when the heater 25 is heated, the heat can be quickly transmitted to the metal block 270 through the first extension portion 322b of the first electrode 322, and the metal block is reduced or removed by the first flux 26〇. The surface oxide layer produced under normal current operation further improves the reliability of ensuring rapid melting of the metal block 270. It should be noted that in the present embodiment, the lower electrode 33 of the protection element 200c has a first configuration corresponding to the first sub-electrode 322, the second sub-electrode 324, the second sub-electrode 326, and the fourth sub-electrode 328. The five sub-torques 332, a sixth sub-electrode 334, a seventh sub-electrode 336 and a eighth sub-drain, 338. However, in another embodiment, the lower electrode 330 may also be designed according to the design. And the fifth sub-electrode 332 has a second surface 2丨4 on the substrate 21〇: forming an empty design design to improve the protection component assembly. In the circuit board (the direction of the placement is not correct.) Figure 6 is a cross-section of the protective element of another embodiment of the present invention, the texture of the map, in the present embodiment, the protection of Figure 6 The element 2% is similar to the protection element 2A of FIG. 2A to FIG. 2D, but the main difference between the two is that the protection element 200d of the ® 6 includes a housing 296. Detailed description of the township ^ 19 201137914 a _ 1 W 33983twf.doc / n, the housing 296 is disposed on the first surface 212 of the substrate 21 ,, and covers the block 270 ′ to protect the metal block 27 〇, and can be avoided The molten state, the first-cosolvent fine 'second assist solvent 265, and the solder layer 292 flow out to cause circuit interference and the like. In addition, 2% of the material of the housing is covered with LV? 2 _ EK EK), nylon (nyl 〇 n), thermoplastic resin, external light curing resin or expectant enamel resin and other materials. The above embodiments are merely illustrative, and those skilled in the art of other t: SC's can refer to the foregoing embodiments to the desired technical effects. Figure 7 is a schematic view of an embodiment of the present invention. Please refer to FIG. 7 , which can be stored on the protection element 20〇a of the male and the embodiment, and the element b, 0d) can be combined with a battery 4 f. The device is uniquely combined into an electronic device. It is expected that I! ”40 (3 external connection - power supply like day ^ 2 ^ battery 410 for charging and discharging material:: in the device 400 to protect this οππ in the yoke example, the battery 410 coupled to the side Το件20〇a._Controller 4 front where the detection controller 430 is, for example, a - MOSFET oxide field effect transistor (m〇sf (IC) day film and a gold to protection class a, with i ^ Supply the axis when the detection controller 430 detects _ 2:, the device 43 0 will this high voltage (not included in the South Japan) detection control heater 250 (please refer to Figure 2D), in the protection 兀Piece 2G0a force σ " to blow metal block 270 (please refer to _ 20 J01-TW 33983twf.doc/n 201137914 2D). In addition, 'when the power supply 52 〇 provides an overcurrent (when the protection element 2GGa is not passed) The metal block of the bird's towel is automatically heated by the passage of current through the 2nd 7th. Since, in this embodiment, the sub-device_ is the above-mentioned key component win (or protection ^ 200b~200d)' Therefore, in addition to the fact that the circuit can be surely cut off, an effective prevention can be achieved. ': It can avoid the phenomenon that the protection element bird is short-circuited, and the electronic device 4 〇〇 has better reliability. In summary, the present invention has at least the following effects: 1. The protective element of the present invention is connected to the bridge J above the metal block, so that when the heater is heated to cause the metal block to be in a molten state, the metal block will Due to the surface tension and capillary phenomenon, it is effective to prevent the over-current from being over 2 Μ 断 而 2 2. 2. 2. 2. 2. 2. 2. 2. 2. The "oxidation layer of the agent" can be reduced - 3. Since the amount of melting of the metal block of the present invention is caused by the gold-based block conduction extension (four) pole, the short-circuit is present: the material of the bridge connection of the present invention is metal Or alloy, so the bridge', with the function of heat dissipation, can improve the protection element = product and the small ruler: = Γ, so when the protection component shrinks its component volume for the electronic production buckle, it can also provide phase 21 201137914 • TW 33983twf.doc/n The effective electrode area and the appropriate bridge wire can ensure that the metal block can be quickly blown' with better reliability. 6. The area of the longitudinal section of the bridge wire of the protection element of the invention With metal The ratio of the cross-sectional area is greater than or equal to 2.6, which ensures the reliability of the effective melting of the metal block. 7. The protective element of the present invention is designed to quickly and surely blow the metal block on the first sub-electrode and the bridge wire on the first surface of the substrate The orthographic projections are at least partially overlapped to avoid melting of the other regions of the metal block to cause electrical shorts. Although the invention has been disclosed in the above embodiments, it is not intended to limit the invention to any of the technical fields of the invention. Generally, those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention is defined by the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a conventional protective element. 2A is a top plan view of a protective element according to an embodiment of the present invention. FIG. 2B is a bottom view of the protective element of FIG. FIG. 2C is a diagram showing the protection component of FIG. 2D. FIG. 2D is a diagram of FIG.

Schematic diagram of the cross section of the protective read along the line π_π of the (丁(4) 2A, from the cross section of the protective element of another embodiment of the present invention 201137914 xvjL-/-uy^001 - TW 339S3twf.doc/n FIG. 3B is the present invention A cross-sectional view of a protective element of yet another embodiment. 4A to 4D are plan views showing a process of a protective element according to an embodiment of the present invention. Figure 5A is a top plan view of a protective element in accordance with another embodiment of the present invention. FIG. 5B is a bottom view of the protection element of FIG. 5A. Figure 5C is a cross-sectional view of the protective element of Figure 5A taken along line III-III. Figure 6 is a cross-sectional view of a protective element in accordance with another embodiment of the present invention. FIG. 7 is a block diagram of an electronic device according to an embodiment of the invention. [Description of Main Components] 100: Thermal Fuse Package 110: Substrate 120: Heater 125: Heater Electrode 130: Insulation Layer 140: Metal Layer 150: Flux 160: Electrode Layer 165: Intermediate Electrode 201137914 jtu^-ui/ yuui-TW 33983twf.doc/n 200a, 200b, 200b', 200c, 200d: protection element 210: substrate 212: first surface 214: second surface 216: side surface 220, 320: upper electrode 222, 322: first Sub-electrodes 222a, 322a: body portions 222b, 322b: first extensions 222c: second extensions 224, 324: second sub-electrodes 224a: third extensions 226, 326: third sub-electrodes 228, 328: fourth Sub-electrodes 230, 330: lower electrodes 232, 332: fifth sub-electrodes 232a, 322c: second extensions 234, 334: sixth sub-electrodes '234a, 324a: third extensions 236, 336: seventh sub-electrode 238 338: eighth sub-electrode 240, 340: terminal electrode 250: heater 260: first flux 201137914

... J01-TW 33983twf.doc/n 265: second flux 269: auxiliary medium 270: metal block 280, 280a, 285: bridge wire 282a: first end 282b: second end 292: solder layer 294: insulating layer 296 : housing 323 : joint portion 400 : electronic device 410 : battery 430 : detection controller 520 : power supply D, D1 : separation distance

25

Claims (1)

201137914 33983twf.doc/n VII. Patent Application Range: 1. A protective component comprising: • a terminal electrode heater, a substrate having a first surface and a second surface opposite to each other; an upper electrode disposed on the substrate The first surface includes a first sub-electrode and a third sub-electrode and a fourth sub-electrode opposite to each other; a lower electrode disposed on the second surface of the substrate; connecting the upper electrode and the lower surface An electrode is disposed on the substrate and electrically connected to the first sub-electrode; a metal block disposed on the first surface of the substrate and connecting the third sub-electrode and the fourth sub-electrode; At least one bridge wire is disposed above the metal block and partially in contact with the metal block, and has a first end and a second end opposite to each other, wherein the f-bridge wire is disposed on the first sub-electrode And the bridge projection f the orthographic projection on the first surface of the substrate at least partially overlaps the orthographic projection of the first sub-electrode on the first surface of the substrate. 2. The protection element of claim 4, wherein the first sub-electrode has a first extension connected to the body portion, and the first extension is located in the third sub-portion Between the electrode and the fourth sub-electrode. 3. If the application is specifically directed to the protection described in item 2, the second end of the loose connection is fixed to the first extension. σ 4. If the protection element described in item 2 of the patent stipulations is applied, the second end of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity /n 201137914 On an extension. 5. As claimed in claim 2, the region (4) in which the basin-extension portion is located is the effective electrode area, and the ratio of the product of the bridge 1 = section to the area of the effective electrode area is greater than or equal to 6. As claimed in claim 2, the length of the extension direction of the first extension portion multiplied by the length of the metal block is - the cross-sectional area of the metal block, and the bridge wire The ratio of the longitudinal section and the area to the cross-sectional area of the metal block is greater than or equal to 26. 7. If the application is specifically for the protection element described in item 2, the extension of 1 is extended above the heater, and the orthographic projection of the bridge on the Ϊ ΐ surface of the substrate and the first extension are The orthographic projections on the first surface of the substrate at least partially overlap. The protection component of claim 1, wherein the bridge (four) point is spaced apart from the side surface of the metal block by a distance ^ ’ mm to. Between the .25 axes. 9. The protective element of claim 2, further comprising a 彳 彳 disposed on the first surface of the substrate between the first electrode and the fourth sub-electrode. — π10· * The protective element described in claim 1 of the patent application, further comprising a flux disposed between the bridge wire and the metal block. 11. The view of the bridge connection in the protection of the Yuanzhang as stated in the scope of the patent scope is __ or - bent. 12. The protective element of claim 2, wherein the 27 201137914 ινιν-υ^7υυι-Τ\ν 33983twf.doc/n heater is located on the second surface of the substrate and is connected Lower electrode. Lower electrode member = the power-on: the protection element according to the item 1, wherein the first device is connected to the first surface 15. Cover the heater with an insulating layer as described in Section 1-5 of the U. 0. The protective element forming plate as described in claim i is disposed on the first surface of the substrate, and covers the metal block-protective element, comprising: a substrate having one opposite to each other a first surface and a second surface. The upper electrode is disposed on the first surface of the substrate, including a first sub-electrode and a third sub-electrode and a fourth sub-electrode opposite to each other; a lower electrode is disposed on the second surface of the substrate; an one end electrode is connected to the upper electrode and the lower electrode; a heating state is disposed on the substrate, and electrically connected to the first sub-electricity and connected to the first electrode a metal block disposed on the first surface of the substrate, the second sub-electrode and the fourth sub-electrode; at least one bridge wire disposed above the metal block and having a first end and a second end opposite to each other , wherein the first end of the bridge wire is 28 201137914 KU-uyy〇01-TW 33983 twf.doc/n on the sub-electrode, J' the bridge is on the first surface of the substrate, the positive shadow and the first The sub-electrodes are at least partially overlapped on the substrate ^; and a positive-assisted medium on the surface is disposed between the bridge and the metal block. R. The protective element according to claim 17, wherein the self-service medium is a co-solvent or a solder layer. 〃~ 19.-Electronic device, comprising: a protection component as described in claim 1 or 17; a battery coupled to the protection component; and a detection controller coupled to The protection component and the battery, wherein the detection controller detects the __overvoltage state, the detection controller will apply voltage to the protection component, and the heater 4 driving the protection component is hot Break the metal block. ,°° C 29