CN113380578A - Protective element - Google Patents
Protective element Download PDFInfo
- Publication number
- CN113380578A CN113380578A CN202011503310.7A CN202011503310A CN113380578A CN 113380578 A CN113380578 A CN 113380578A CN 202011503310 A CN202011503310 A CN 202011503310A CN 113380578 A CN113380578 A CN 113380578A
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- Prior art keywords
- magnet
- pair
- electrodes
- cobalt magnet
- samarium cobalt
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention has higher reliability of operation in high temperature environment. The protection element (10) comprises: an insulating base body (20), a positive electrode (22), a negative electrode (24), a heating element (26), a bonding material (28), an insulating spacer layer (30), a compression coil spring (32), an insulating plate (34), a guide wire (36), and a magnetic force generating section (38). The magnetic force generating unit (38) generates a magnetic force between the positive electrode (22) and the negative electrode (24) in advance. The magnetic force generating part (38) has a samarium cobalt magnet (50), a magnet accommodating space forming part (90), and a filler (54). A magnet housing space forming part (90) forms a magnet housing space. A samarium cobalt magnet (50) is accommodated in the magnet accommodating space. A filler material (54) is contained within the magnet-containing space along with the samarium cobalt magnet (50). A filler (54) is filled in a gap between a samarium-cobalt magnet (50) and a magnet-accommodating-space forming portion (90).
Description
Technical Field
The present invention relates to a protective element.
Background
Patent document 1 discloses a protective element. The protection element of patent document 1 includes: a pair of electrodes, a heating element, a bonding material, and an elastic body. The pair of electrodes are disposed to face each other. The heating element is disposed so as to straddle between the pair of electrodes. The heating element generates heat when a current flows. The joining material joins the heat-generating body to each of the pair of electrodes. The elastic body is disposed between the pair of electrodes. The elastic body applies a separating force to the heating element. The separating force is a force in a direction to separate the heating element from the pair of electrodes. The bonding strength of the bonding material is lower than a predetermined strength at a predetermined temperature. The predetermined temperature is a temperature reached by heat generation of the heating element. The predetermined strength is a strength to withstand the separating force. The protection element of patent document 1 further includes: a shielding insulator and a magnetic force generating part. The shielding insulator is disposed between the pair of electrodes so as to shield one of the pair of electrodes from the other. The magnetic force generating unit generates a magnetic force between the pair of electrodes in advance. The protection element disclosed in patent document 1 allows a larger current to flow at a voltage higher than that of the conventional protection element.
Patent document 1: japanese patent laid-open publication No. 2013-98134.
Disclosure of Invention
However, with regard to the protective element, further improvement in reliability of operation in a high-temperature environment is required. The present invention is proposed to solve such problems. The invention aims to provide a protective element which has higher reliability of operation in a high-temperature environment.
The protective element of the present invention is explained with reference to the drawings. Note that the reference numerals used in this section are for the purpose of facilitating understanding of the invention, and are not intended to limit the scope of the invention to the drawings.
In order to solve the above-described problems, according to an aspect of the present invention, a protection element 10 includes: a pair of electrodes 22, 24, a heating element 26, a bonding material 28, an elastic body 32, and a magnetic force generating portion 38. A pair of electrodes 22, 24 are opposed to each other. The heating element 26 is disposed so as to straddle between the pair of electrodes 22, 24. The heating element 26 generates heat when a current flows. The joining material 28 joins the heating element 26 to each of the pair of electrodes 22, 24, respectively. The elastic body 32 is disposed between the pair of electrodes 22, 24. The elastic body 32 applies a separating force to the heating element 26. The magnetic force generator 38 generates a magnetic force between the pair of electrodes 22 and 24 in advance. The separating force is a force in a direction to separate the heating element 26 from the pair of electrodes 22 and 24. The bonding strength of the bonding material 28 is lower than a predetermined strength at a predetermined temperature. The predetermined temperature is a temperature reached by heat generation of the heating element 26. The predetermined strength is a strength to withstand the separating force. The magnetic force generating unit 38 includes: samarium cobalt magnet 50, magnet receiving space forming portion 90, and filler material 54. The magnet accommodating space forming portion 90 forms a magnet accommodating space. A samarium cobalt magnet 50 is accommodated in the magnet accommodating space. The filler material 54 is contained within the magnet receiving space along with the samarium cobalt magnet 50. The filler material 54 is filled in the gap between the samarium cobalt magnet 50 and the magnet receiving space forming portion 90.
When an overcurrent flows through the heating element 26 disposed across the pair of electrodes 22, 24, the heating element 26 generates heat. When the joining material 28 reaches a predetermined temperature by the heat generation of the heating element 26, the joining strength of the joining material 28 is lower than a predetermined strength. When the bonding strength of the bonding material 28 is lower than the prescribed strength, the bonding material 28 will not be able to withstand the separating force. Since the heat generating element 26 cannot withstand the separating force, the heat generating element is separated from the electrodes 22 and 24 by the elastic member 32. Thereby, the current between the electrodes 22, 24 is cut off. When an arc is generated between the electrodes 22, 24 after the current is cut off, the arc receives lorentz force by the magnetic force generated by the magnetic force generating portion 38. The arc lengthens as a result of receiving the lorentz force. When the arc is elongated, the arc voltage rises as compared with the case where it is not elongated. In addition, the arc cools down as it lengthens. The arc is difficult to sustain due to the synergistic effect of the rise in arc voltage and the cooling of the arc. As a result, a large current can flow at a large voltage. The magnetic force generating portion 38 has a samarium cobalt magnet 50 that has superior performance to a ferrite magnet in a high temperature environment. Since the magnet housing space forming portion 90 forms the magnet housing space and houses the samarium cobalt magnet 50 in the magnet housing space, the possibility that the samarium cobalt magnet 50 receives a direct force from the outside of the protective element 10 is reduced. Since the filler material 54 is filled in the gap between the samarium cobalt magnet 50 and the magnet accommodating space forming portion 90, the samarium cobalt magnet 50 does not collide with the magnet accommodating space forming portion 90. This reduces the possibility of breakage of the samarium cobalt magnet 50, compared to a case where it is not. Since the possibility of breakage of the samarium cobalt magnet 50 is reduced, reduction in magnetic flux density accompanying breakage of the samarium cobalt magnet 50 is less likely to occur. If the decrease in magnetic flux density is less likely to occur, the possibility of the resulting operation failure is reduced. As a result, it is possible to provide a protective element which is more reliable in operation in a high-temperature environment.
Preferably, the material of the filler 54 is any one of epoxy resin, silicone resin, and urethane resin.
When any one of the epoxy resin, the silicone resin, and the urethane resin is a material of the filling material 54, the filling material 54 has a cushioning effect. This reduces the possibility of breakage of the samarium cobalt magnet 50 more than would otherwise be the case. As a result, it is possible to provide a protective element which is more reliable in operation in a high-temperature environment.
Alternatively, the filler material 54 described above preferably holds the samarium cobalt magnet 50 in close proximity to the region 170 of the magnet receiving space forming portion 90 that is opposite the pair of electrodes 22, 24.
Since the filler material 54 causes the samarium cobalt magnet 50 to be in close contact with the region 170 of the magnet-accommodating-space forming portion 90 that faces the pair of electrodes 22, 24, the arc receives a larger lorentz force than when the samarium cobalt magnet 50 is removed from the region 170. Since the filler material 54 having a cushioning effect causes the samarium cobalt magnet 50 to be in close contact with the region 170 of the magnet-accommodating-space forming portion 90 that faces the pair of electrodes 22, 24, even if the samarium cobalt magnet 50 receives a force from the region 170, the influence of the force can be alleviated. This reduces the possibility of breakage of the samarium cobalt magnet 50, compared to a case where it is not. Since the possibility of breakage of the samarium-cobalt magnet 50 is reduced, the possibility that the long-term maintenance arc receives a large lorentz force becomes high. As a result, it is possible to provide a protective element which is more reliable in operation in a high-temperature environment.
According to the present invention, a protective element that operates more reliably in a high-temperature environment can be provided.
Drawings
Fig. 1 is a perspective view of a protective element according to an embodiment of the present invention.
Fig. 2 is a sectional view of a protective member according to an embodiment of the present invention.
Fig. 3 is a perspective view of a case according to an embodiment of the present invention.
Fig. 4 is a view showing a state in which samarium-cobalt magnets are gradually accommodated in the magnet accommodating space according to a modification of the embodiment of the present invention.
Fig. 5 is a cross-sectional view of the vicinity of the magnet housing space forming portion of the case in a case where the filler has a buffer layer according to a modification of the embodiment of the present invention.
The reference numerals are explained below:
10: protective element
20: insulating matrix
22: positive electrode
24: negative electrode
26: heating body
28: bonding material
30: insulating isolation layer
32: compression coil spring
34: insulating board
36: guide wire
38: magnetic force generating part
50: samarium cobalt magnet
52: box body
54: filling material
90: magnet housing space forming part
92: operating space forming part
150: guide wire holding hole
152: guide wire holding recess
170: electrode opposing region
190: epoxy resin
192: buffer layer
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings. In the following description, the same components are given the same reference numerals. The names and functions of these components are also the same. Therefore, detailed description of these components will not be repeated.
[ description of the Structure ]
Fig. 1 is a perspective view of a protection element 10 of the present embodiment. In fig. 1, the protection element 10 is shown in an assembled state. In this figure, a portion of the protection element 10 is removed. Fig. 2 is a sectional view of the protection element 10 of the present embodiment. The structure of the protection element 10 of the present embodiment will be described with reference to fig. 1 and 2.
The protection element 10 of the present embodiment includes: an insulating base 20, a positive electrode 22, a negative electrode 24, a heating element 26, a bonding material 28, an insulating separator 30, a compression coil spring 32, an insulating plate 34, a guide wire 36, and a magnetic force generating portion 38.
In the case of the present embodiment, the insulating base 20 is made of Bakelite (Bakelite). The insulating base 20 serves as a base. The insulating base body 20 is provided with a guide wire holding recess 152.
The positive electrode 22 and the negative electrode 24 are a pair of electrodes in the protection element 10 of the present embodiment. The positive electrode 22 and the negative electrode 24 are fixed to the insulating base 20 in such a manner that their respective one ends face each other and project from the insulating base 20.
The heating element 26 is a rectangular member with a hole at the center. The heat-generating body 26 is disposed so as to straddle between the positive electrode 22 and the negative electrode 24. The heating element 26 generates heat when a current flows.
In the case of the present embodiment, the bonding material 28 is used to bond the heating element 26 to the positive electrode 22. In the case of the present embodiment, the joining material 28 is used to join the heating element 26 and the negative electrode 24. The bonding strength of the bonding material 28 is lower than a predetermined strength at a predetermined temperature. In the present embodiment, the "predetermined temperature" is a temperature reached by heat generation of the heating element 26. In the present embodiment, the bonding material 28 is an alloy having the above-described "predetermined temperature" as a melting point.
The insulating spacer 30 is a member having a cylindrical portion and an annular portion protruding from one end of the cylindrical portion. The insulating spacer 30 insulates between the insulating base 20 and the compression coil spring 32.
The compression coil spring 32 is disposed between the positive electrode 22 and the negative electrode 24. The compression coil spring 32 applies a separating force to the heating element 26. In the case of the present embodiment, the "separating force" refers to a force in a direction in which the heating element 26 joined to the positive electrode 22 and the negative electrode 24 is separated from the positive electrode 22 and the negative electrode 24 joined thereto. The "predetermined strength" mentioned above means a strength to withstand the separating force. That is, when the temperature reaches a predetermined temperature, the joining material 28 cannot withstand the separating force.
The insulating plate 34 is a disk-shaped member having an opening at the center. The insulating plate 34 is disposed so as to be placed on the compression coil spring 32. The insulating plate 34 insulates the compression coil spring 32 and the heating element 26 from each other.
The guide wire 36 is a cylindrical member. The end of the guide wire 36 is inserted into the guide wire holding recess 152 of the insulating base body 20. The guide wire 36 penetrates the heating element 26. The heat-generating body 26 which has endured the separating force rises along the guide wire 36.
The magnetic force generator 38 generates a magnetic force between the positive electrode 22 and the negative electrode 24 in advance. In the present embodiment, the magnetic force generating portion 38 includes a samarium cobalt magnet 50, a case 52, and a filler 54.
In the case of the present embodiment, the samarium cobalt magnet 50 has a rectangular parallelepiped shape. Thus, the samarium cobalt magnet 50 of the present embodiment has a pair of planes parallel to each other. One of the pair of planes is the N-pole of the samarium cobalt magnet 50 of the present embodiment. The other of the pair of planes is the S-pole of the samarium cobalt magnet 50 of the present embodiment.
The case 52 covers the positive electrode 22, the negative electrode 24, the heating element 26, the joining material 28, and the compression coil spring 32 and holds the samarium-cobalt magnet 50.
Fig. 3 is a perspective view of the case 52 of the present embodiment. The structure of the case 52 of the present embodiment will be described with reference to fig. 3. The case 52 of the present embodiment is made of bakelite. In the present embodiment, the case 52 includes a pair of magnet housing space forming portions 90 and an operation space forming portion 92. The pair of magnet housing space forming portions 90 and the operation space forming portion 92 are integrated.
In the case of the present embodiment, the pair of magnet housing space forming portions 90 are opposed to each other with the operation space forming portion 92 interposed therebetween. The magnet accommodating space forming portion 90 forms a magnet accommodating space. The magnet accommodating space forming portion 90 has an electrode facing region 170. The electrode facing region 170 faces the positive electrode 22 and the negative electrode 24. One samarium cobalt magnet 50 is accommodated in each of the magnet accommodating spaces.
The operation space forming portion 92 forms an operation space. The positive electrode 22, the negative electrode 24, the heating element 26, the bonding material 28, and the compression coil spring 32 are accommodated in the operation space. A guide wire holding hole 150 is formed in the ceiling portion of the operating space forming portion 92.
The filler material 54 is accommodated in the magnet accommodating spaces formed by the pair of magnet accommodating space forming portions 90 together with the samarium cobalt magnet 50. The filler material 54 is filled in the gap between the samarium cobalt magnet 50 and the magnet receiving space forming portion 90. As is apparent from fig. 2, the filler 54 of the present embodiment brings the samarium cobalt magnet 50 into close contact with the electrode facing region 170 in the magnet accommodating space forming portion 90.
[ description of the production method ]
The protection element 10 of the present embodiment is manufactured by the following steps. First, the manufacturer manufactures the components constituting the protective element 10 of the present embodiment. Methods of manufacturing these components are well known. And thus their detailed description will not be repeated.
When manufacturing the above-described components, the manufacturer inserts one of the end portions of the guide wire 36 into the guide wire holding recess 152 of the insulating base body 20. Next, the manufacturer fixes the positive electrode 22 and the negative electrode 24 on the insulating base 20. When these are fixed, the manufacturer causes the insulating spacer 30, the compression coil spring 32, the insulating plate 34, and the heating element 26 to penetrate the guide wire 36. When the lead wire 36 penetrates these, the manufacturer joins the heating element 26 to the positive electrode 22 and the negative electrode 24 via the joining material 28.
When the heating element 26 is joined to the positive electrode 22 and the negative electrode 24, the manufacturer manufactures the magnetic force generating portion 38. First, the manufacturer places samarium cobalt magnet 50 into the magnet receiving space. At this time, the samarium cobalt magnet 50 is disposed in close contact with the electrode facing region 170. Next, the manufacturer fills the magnet housing space of the case 52 with epoxy resin before polymerization. The epoxy filled into the magnet accommodating space presses the samarium cobalt magnet 50 toward the electrode opposing region 170. Then, when the polymerization of the epoxy resin is completed, the epoxy resin is cured. A cured epoxy resin is used as the filler material 54. Thereby, the filler 54 causes the samarium cobalt magnet 50 to be in close contact with the electrode facing region 170, i.e., the region facing the pair of positive and negative electrodes 22 and 24 in the magnet accommodating space forming portion 90.
Next, the manufacturer covers the insulating base 20 with the case 52. At the same time, the manufacturer passes the guide wire 36 through the guide wire holding hole 150. When the guide wire 36 penetrates the guide wire holding hole 150, the manufacturer fills the epoxy before polymerization in the recess around the guide wire holding hole 150 in the case 52. When the epoxy resin is cured, the protective element 10 of the present embodiment is completed.
[ description of the method of use ]
The protection element 10 of the present embodiment is used to protect a lithium ion secondary battery when any one of overcurrent, overcharge, and overdischarge occurs, for example. The protection element 10 of the present embodiment is not strictly protected, but may be used to cut off the supply of electric power for a reason similar to protection. The protection element 10 of the present embodiment is used as one of elements constituting a secondary battery protection circuit, for example. In this case, the protection element 10 of the present embodiment is connected in series with the lithium-ion secondary battery. The protection element 10 of the present embodiment receives supply of electric power based on an operation of any one of the other elements constituting the secondary battery protection circuit described above. The current generated by the electric power flows from the positive electrode 22 to the negative electrode 24 of the protection element 10 of the present embodiment. The current passes through the heating element 26. Since the current passes through the heating element 26, the heating element 26 generates heat. When the heat-generating body 26 generates heat, the temperature of the joining material 28 rises. When the temperature of the joining material 28 reaches the above-described prescribed temperature, the joining material 28 melts. When the joining material 28 melts, the heating element 26 is separated from the positive electrode 22 and the negative electrode 24 by compressing the coil spring 32. Thus, current no longer flows from the positive electrode 22 to the negative electrode 24. When the current no longer flows from the positive electrode 22 to the negative electrode 24, the electric power supplied to the lithium ion secondary battery is cut off. As a result, the lithium ion secondary battery can be protected.
When the heating element 26 is separated from the positive electrode 22 and the negative electrode 24 by compressing the coil spring 32, an arc may be generated. When an arc is generated, electrons are released from the negative electrode 24 to the positive electrode 22. The samarium-cobalt magnet 50 of the magnetic force generating portion 38 generates a magnetic force between the positive electrode 22 and the negative electrode 24 in advance, and thus a lorentz force acts on the released electrons. Since the lorentz force acts on the electrons, the trajectory of the arc is bent. When the trajectory is curved, the arc is lengthened compared to the case of no curve. When the arc is elongated, the voltage generated by the arc (arc voltage) becomes higher than in the case where it is not elongated. In addition, the arc cools down as it lengthens. Further, the arc is cooled by contacting the case 52, i.e., the structural body made of the insulating material. The arc is difficult to sustain due to the synergistic effect of the rise in arc voltage and the cooling of the arc. Since the arc is hard to continue, the protection element 10 of the present embodiment can flow a larger current at a larger voltage than before.
[ Explanation of Effect ]
In the protection element 10 of the present embodiment, the samarium-cobalt magnet 50 included in the magnetic force generating portion 38 has better performance than the ferrite magnet in a high-temperature environment. In the event that the samarium cobalt magnet 50 is damaged, the pieces of the samarium cobalt magnet 50 provide a magnetic force with respect to each other. When the pieces of samarium cobalt magnet 50 provide a magnetic force with respect to each other, a portion of the magnetic force that was directed toward the exterior of the samarium cobalt magnet 50 prior to breakage may be directed from any one of the pieces of samarium cobalt magnet 50 toward the other piece. This reduces the magnetic flux density outside the magnetic force generating portion 38. On the other hand, the magnet housing space forming portion 90 of the case 52 forms the magnet housing space and houses the samarium cobalt magnet 50 in the magnet housing space, so that the possibility that the samarium cobalt magnet 50 receives a direct force from the outside of the protective element 10 is reduced. By filling the filler material 54 in the gap between the samarium-cobalt magnet 50 and the magnet-receiving-space forming portion 90, the samarium-cobalt magnet 50 does not collide with the magnet-receiving-space forming portion 90. This reduces the possibility of breakage of the samarium cobalt magnet 50, compared to a case where it is not. When the samarium-cobalt magnet 50 becomes hard to break, a decrease in magnetic flux density accompanying the breakage of the samarium-cobalt magnet 50 is hard to occur. When the decrease in magnetic flux density is difficult to occur, the possibility that the arc is difficult to lengthen or difficult to cool is reduced. When the possibility that the arc is difficult to lengthen or difficult to cool is reduced, the possibility of the operation failure caused by this is reduced. As a result, the protective element 10 of the present embodiment operates more reliably in a high-temperature environment.
In the protective element 10 of the present embodiment, since the material of the filler 54 is epoxy resin, the possibility of breakage of the samarium cobalt magnet 50 is further reduced by the cushioning effect of the filler 54. As a result, the protective element 10 of the present embodiment is more reliable in operation in a high-temperature environment.
In the protective element 10 of the present embodiment, the filler 54 brings the samarium cobalt magnet 50 into close contact with the electrode facing region 170 in the magnet housing space forming portion 90. Thus, the arc receives a larger lorentz force than when the samarium-cobalt magnet 50 is spaced from the electrode-opposing region 170. By bringing the samarium cobalt magnet 50 into close contact with the electrode-facing region 170 by the filler material 54 having a cushioning effect, even if the samarium cobalt magnet 50 receives a force from the electrode-facing region 170, the influence of the force can be alleviated. This reduces the possibility of breakage of the samarium cobalt magnet 50, compared to a case where it is not. Since the likelihood of breakage of the samarium-cobalt magnet 50 is reduced, the likelihood of the long-term maintenance arc receiving a large lorentz force is increased. As a result, a protective element with higher reliability of operation in a high-temperature environment can be provided.
Description of the modified example
The protection element 10 described above is an example for embodying the technical idea of the present invention. The protective element 10 described above can be modified in various ways within the scope of the technical idea of the present invention.
For example, the number and arrangement of the magnets are not limited to the above configuration. The material of the insulating substrate 20 and the case 52 may be a phenolic resin other than bakelite. These materials may also be other insulating materials. Examples of other insulating materials are polybutylene terephthalate (PBT) and polyphenylene sulfide (PPS). These insulating materials may or may not include a filler material. As an example of the insulating material including the filler, polyphenylene sulfide including a glass filler is given. The direction in which the magnetic force is generated by the magnetic force generating unit 38 is not particularly limited, and may be any direction in which the arc generated between the positive electrode 22 and the negative electrode 24 can be extended by the lorentz force. The protection member of the present invention may have another elastic body such as a coil spring instead of the compression coil spring 32.
The material of the filler 54 may be any one of silicone resin and urethane resin. The material of the filler 54 is not limited to the synthetic resin as the buffer material.
The manufacturing steps of the protective element of the present invention are not limited to the above steps. The magnetic force generating portion 38 may be manufactured by, for example, the steps described below. In this case, first, the manufacturer fills a small amount of epoxy resin 190 before polymerization into the magnet accommodating space of case 52. Next, the manufacturer places samarium cobalt magnet 50 into the magnet receiving space. At this time, the samarium-cobalt magnet 50 is placed so that a gap is formed between the samarium-cobalt magnet 50 and the electrode-facing region 170. Fig. 4 is a view of a situation in which the samarium cobalt magnet 50 is gradually accommodated in the magnet accommodating space. When housing samarium cobalt magnet 50 in the magnet receiving space, the manufacturer adds pre-polymerized epoxy 190 to the magnet receiving space. Then, when the polymerization of epoxy resin 190 is completed, epoxy resin 190 is cured. A cured epoxy 190 is used as the filler material 54. In this case, epoxy 190 is entered into the gap between samarium cobalt magnet 50 and electrode opposing region 170 by immersing samarium cobalt magnet 50 in epoxy 190 that has been filled. Epoxy 190 is then further inserted into the gap between samarium-cobalt magnet 50 and electrode opposing region 170 by adding pre-polymerized epoxy 190. As a result, the filler material 54 will have a buffer layer 192 disposed between the samarium cobalt magnet 50 and the electrode opposing region 170. Fig. 5 is a cross-sectional view of the vicinity of the magnet accommodating space forming portion 90 of the case 52 in the case where the filler 54 has the buffer layer 192.
Claims (3)
1. A protective element, comprising:
a pair of electrodes opposing each other;
a heat generating body that is disposed so as to straddle between the pair of electrodes and generates heat when a current flows;
a bonding material that bonds the heating element to each of the pair of electrodes;
an elastic body disposed between the pair of electrodes and applying a separating force to the heating element; and
a magnetic force generating part for generating magnetic force between the pair of electrodes in advance,
the separating force is a force in a direction in which the heating element is separated from the pair of electrodes,
the bonding strength of the bonding material is lower than a prescribed strength at a prescribed temperature,
the predetermined temperature is a temperature reached by heat generation of the heating element,
the prescribed strength is a strength that withstands the separating force, characterized in that,
the magnetic force generating part includes:
a samarium cobalt magnet;
a magnet accommodating space forming portion that forms a magnet accommodating space that accommodates the samarium-cobalt magnet; and
a filler material accommodated in the magnet accommodating space together with the samarium cobalt magnet and filled in a gap between the samarium cobalt magnet and the magnet accommodating space forming part.
2. The protective element according to claim 1,
the material of the filling material is any one of epoxy resin, silicon resin and polyurethane resin.
3. The protective element according to claim 2,
the filler material holds the samarium cobalt magnet against an area of the magnet receiving space formation opposite the pair of electrodes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-039724 | 2020-03-09 | ||
| JP2020039724A JP7416413B2 (en) | 2020-03-09 | 2020-03-09 | protection element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113380578A true CN113380578A (en) | 2021-09-10 |
Family
ID=77569099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011503310.7A Pending CN113380578A (en) | 2020-03-09 | 2020-12-18 | Protective element |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7416413B2 (en) |
| KR (1) | KR20210113935A (en) |
| CN (1) | CN113380578A (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5779477B2 (en) | 2011-11-04 | 2015-09-16 | 内橋エステック株式会社 | Protective element |
| JP6816875B2 (en) | 2016-10-19 | 2021-01-20 | 内橋エステック株式会社 | Protective element |
| JP6716516B2 (en) | 2017-09-07 | 2020-07-01 | Ｌｉｔｔｅｌｆｕｓｅジャパン合同会社 | Protective element |
-
2020
- 2020-03-09 JP JP2020039724A patent/JP7416413B2/en active Active
- 2020-11-26 KR KR1020200160927A patent/KR20210113935A/en unknown
- 2020-12-18 CN CN202011503310.7A patent/CN113380578A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| KR20210113935A (en) | 2021-09-17 |
| JP7416413B2 (en) | 2024-01-17 |
| JP2021141013A (en) | 2021-09-16 |
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