CN2593323Y - Overcurrent protection assembly - Google Patents
Overcurrent protection assembly Download PDFInfo
- Publication number
- CN2593323Y CN2593323Y CN 02251831 CN02251831U CN2593323Y CN 2593323 Y CN2593323 Y CN 2593323Y CN 02251831 CN02251831 CN 02251831 CN 02251831 U CN02251831 U CN 02251831U CN 2593323 Y CN2593323 Y CN 2593323Y
- Authority
- CN
- China
- Prior art keywords
- metallic conduction
- conduction sheet
- overcurrent protection
- protection assembly
- paper tinsel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses an overcurrent protection assembly, which makes use of the characteristic that the outsides and the insides of an upper metallic conduction piece and a lower metallic conduction piece have unbalanced coefficient of thermal expansion to form a deforming torsion toward outside; through the torsion, a current detecting unit is torn to present at least one fracture surface, which leads to an effect similar to electrical open circuit of a fuse; consequently, the utility model achieves the purpose of avoiding the accident that the over-current protection assembly is out of work and burned in case to cause short circuit and lead to using danger for any circuit.
Description
Technical field
The utility model relates to a kind of overcurrent protection assembly, particularly about a kind of overcurrent protection assembly that burns or can be open-circuit condition when losing efficacy.
Background technology
For preventing the circuit generation overcurrent or the overcurrent protection assembly of mistake high temperataure phenomena; along with the extensive use of present portable electronic product (for example mobile phone, mobile computer, hand camera and personal digital aid (PDA) etc.), its importance is also more and more remarkable.
Known overcurrent protection assembly 10 as shown in Figure 1, comprises metallic conduction sheet 16 and following metallic conduction sheet 15 on the current detecting unit 11.This current detecting unit 11 comprise a top electrode paper tinsel 13, once electrode foil 12 and be clipped in both between an electric conducting material 14 with positive temperature coefficient (PTC).Should go up metallic conduction sheet 16 and following metallic conduction sheet 15 and be connected in the surface of this top electrode paper tinsel 13 and bottom electrode paper tinsel 12, with as the lead that is electrically connected with the both positive and negative polarity of secondary cell or connects at arbitrary electronic circuit.This PTC electric conducting material 14 is made up of a polymer and a conductive filler.
Because the resistance value of this PTC electric conducting material 14 is sharp to the variations in temperature reaction, when normal behaviour in service, its resistance can be kept utmost point low value, makes circuit be able to normal operation.But when overcurrent taking place or cross the phenomenon of high temperature, its resistance value can be increased to a high resistance state (for example 10 moment
4More than ohm), and excessive current reversal is offset, to reach the purpose of protective circuit assembly.
Yet when known overcurrent protection assembly 10 itself burns because of improper use,, be called unsafe burning (failure) with causing the last metallic conduction sheet 16 and the following metallic conduction sheet 15 that are connected to battery plus-negative plate to produce short circuit.Thereby the purpose of protective circuit does not only reach originally, may jeopardize the safe in utilization of Circuits System on the contrary.
More and more little along with the volume of secondary cell, the requirement of power service efficiency and safety in utilization is improved day by day; if when assembling with known overcurrent protection assembly 10; with the safety worries that causes in the use, therefore be necessary to propose an effective solution at this problem.
Summary of the invention
Main purpose of the present utility model is to provide a kind of overcurrent protection assembly, can avoid this assembly to produce short circuit when burning and the danger that causes circuit to use.
For achieving the above object and avoid the shortcoming of known technology; the utility model discloses a kind of overcurrent protection assembly; the battery protection that can be used in electronic apparatus is used; it utilizes the outside of metallic conduction sheet and following metallic conduction sheet on one and inboardly has the characteristic of unbalanced hot coefficient of dilatation and produce a torsion that is out of shape laterally; and pull a current detecting unit by this torsion and present at least one plane of disruption; and cause the effect of the electrical open of a similar fuse, produce short circuit when avoiding overcurrent protection assembly to burn and cause Circuits System to use dangerous purpose and reach of the present utility model.
First embodiment of overcurrent protection assembly of the present utility model comprises on the current detecting unit, metallic conduction sheet and metallic conduction sheet once.The surface of metallic conduction sheet had at least one indentation under upward the metallic conduction sheet reached, and can make this overcurrent protection assembly produce a plane of disruption when inefficacy is burnt in this current detecting unit by this at least one indentation, and avoided producing short circuit.
Second embodiment of overcurrent protection assembly of the present utility model comprises on the current detecting unit, one second metallic conduction sheet, one second time metallic conduction sheet and one first time metallic conduction sheet on the metallic conduction sheet, one first.This on first the metallic conduction sheet have than this little hot coefficient of dilatation of metallic conduction sheet on second, and this first time metallic conduction sheet has the hot coefficient of dilatation little than this second time metallic conduction sheet.By this unequal hot coefficient of dilatation, can make this overcurrent protection assembly when burning, in this current detecting unit, produce a plane of disruption, and avoid producing short circuit.
The accompanying drawing summary
Below will be elaborated to the utility model according to accompanying drawing, wherein:
Fig. 1 is the structural representation of known overcurrent protection assembly;
Fig. 2 (a) is the structural representation according to the overcurrent protection assembly of first embodiment of the present utility model;
Fig. 2 (b) is the open-circuit condition schematic diagram of the overcurrent protection assembly shown in Fig. 2 (a) when burning;
Fig. 3 (a) is the overcurrent protection assembly according to second embodiment of the present utility model; And
Fig. 3 (b) is the open-circuit condition schematic diagram of the overcurrent protection assembly shown in Fig. 3 (a) when burning.
Embodiment
Fig. 2 (a) is the overcurrent protection assembly 20 according to first embodiment of the present utility model, and it comprises metallic conduction sheet 26 and following metallic conduction sheet 25 on the current detecting unit 21.This current detecting unit 21 is a positive temperature coefficient resistor assembly, comprises a top electrode paper tinsel 23, once electrode foil 22 and the PTC conductive material 24 that is clipped in both therebetween.The maximum difference of this overcurrent protection assembly 20 and known technology is that there is at least one indentation 27 that cuts out with icking tool on surface of going up metallic conduction sheet 26 and following metallic conduction sheet 25 of the present utility model.Indentation shown in Fig. 2 (a) is a plurality of straight lines parallel to each other, and its purpose is to reduce the surface area of metallic conduction sheet on this 26 and following metallic conduction sheet 25.Therefore indentation 27 of the present utility model is not limited to specific shape, for example netted, wavy, nick shaped or irregular all applicable when practical application.
The open-circuit condition of overcurrent protection assembly when burning of Fig. 2 (b) displayed map 2 (a).When overcurrent protection assembly 20 of the present utility model at high temperature burns, this PTC conductive material 24 will present carbonization, and be easy to embrittlement.At this moment, had a plurality of indentations 27 owing to should go up the outer surface of metallic conduction sheet 26 and following metallic conduction sheet 25, thereby should go up metallic conduction sheet 26 and following metallic conduction sheet 25 and produce a torsion that is out of shape laterally because of the outside and inboard have unbalanced hot coefficient of dilatation.This torsion will continue to pull this current detecting unit 21, and this PTC conductive material 24 that causes at last having presented carbonization presents at least one plane of disruption 28, or from other fragile plane of disruption that produces of assembly.Because the existence of this at least one plane of disruption will make air enter, and cause the effect of the electrical open of a similar fuse, produce short circuit when avoiding this overcurrent protection assembly to burn and cause system to use the purpose of danger and reach of the present utility model.Indentation area of the present utility model preferably accounts for more than 1% of area of metallic conduction sheet on this 26 and following metallic conduction sheet 25, and the preferably accounts for more than 3%, and the best accounts for more than 5%, and the effect that then produces this plane of disruption 28 will be more obvious.
Fig. 3 (a) is the overcurrent protection assembly according to second embodiment of the present utility model.Different with first embodiment is, the last metallic conduction sheet of this overcurrent protection assembly 30 by a hot coefficient of dilatation less first on metallic conduction sheet 31 and a hot coefficient of dilatation bigger second on metallic conduction sheet 32 formed; And following metallic conduction sheet is made up of a hot coefficient of dilatation less first time metallic conduction sheet 34 and second time bigger metallic conduction sheet 33 of a hot coefficient of dilatation.This on first the material of metallic conduction sheet 31 and first time metallic conduction sheet 34 can be selected from: chromium, nickel, titanium and alloy thereof, and this on second the material of metallic conduction sheet 32 and second time metallic conduction sheet 33 can be selected from: copper, aluminium, tin and alloy thereof.
The open-circuit condition of overcurrent protection assembly when burning of Fig. 3 (b) displayed map 3 (a).When overcurrent protection assembly 30 of the present utility model at high temperature burns, this PTC conductive material 24 will present carbonization, and be easy to embrittlement.At this moment, because the hot coefficient of dilatation of this metallic conduction sheet 31 on first is less than the hot coefficient of dilatation of this metallic conduction sheet 32 on second, and the hot coefficient of dilatation of this first time metallic conduction sheet 34 is less than the hot coefficient of dilatation of this second time metallic conduction sheet 33, thereby upward the metallic conduction sheet has unbalanced hot coefficient of dilatation with following metallic conduction sheet and produces a torsion that is out of shape laterally.This torsion will continue to pull this current detecting unit 21, and this PTC conductive material 24 that causes at last having presented carbonization presents at least one plane of disruption 35.Because the existence of this at least one plane of disruption 35 will cause the effect of an electrical open, produce short circuit when avoiding overcurrent protection assembly to burn and cause Circuits System to use the purpose of danger and reach of the present utility model.This overcurrent protection assembly 30 first on the surface of metallic conduction sheet 31 and first time metallic conduction sheet 34 can also add indentation by icking tool, and when high temperature burns, strengthen the effect of the torsion of distortion laterally.
Technology contents of the present utility model and technical characterstic are open as above, yet those skilled in the art still may do all replacement and modifications that does not deviate from the utility model spirit based on teaching of the present utility model and announcement.Therefore, protection range of the present utility model should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present utility model and modifications, and is contained by the determined scope of accompanying Claim.
Claims (9)
1, a kind of overcurrent protection assembly, its feature is being to comprise:
One current detecting unit, it is a positive temperature coefficient resistor assembly, comprises a top electrode paper tinsel, bottom electrode paper tinsel and is clipped in electric conducting material between this two electrode foil;
Metallic conduction sheet on one is connected to this top electrode paper tinsel, and its surface has at least one indentation; And
Once the metallic conduction sheet is connected to this bottom electrode paper tinsel.
2,, it is characterized in that the surface of this time metallic conduction sheet has at least one indentation according to the overcurrent protection assembly of claim 1.
3,, it is characterized in that this indentation is produced by icking tool or etching according to the overcurrent protection assembly of claim 1.
4,, it is characterized in that this indentation area accounts for more than 1% of area of metallic conduction sheet and following metallic conduction sheet on this according to the overcurrent protection assembly of claim 1.
5, a kind of overcurrent protection assembly is characterized in that comprising:
One current detecting unit is a positive temperature coefficient resistor assembly, comprises a top electrode paper tinsel, bottom electrode paper tinsel and is clipped in electric conducting material between this two electrode foil;
Metallic conduction sheet on one comprises:
(a) metallic conduction sheet on one second is connected in this top electrode paper tinsel;
(b) metallic conduction sheet on one first is positioned at this on second on the metallic conduction sheet and coupled, and has the hot coefficient of dilatation that is different from metallic conduction sheet on second; And
Once the metallic conduction sheet is connected in this bottom electrode paper tinsel.
6, according to the overcurrent protection assembly of claim 5, it is characterized in that this time metallic conduction sheet, comprise:
One second time metallic conduction sheet is connected in this bottom electrode paper tinsel; And
One first time metallic conduction sheet is positioned on this second time metallic conduction sheet and coupled, and has the hot coefficient of dilatation that is different from this second time metallic conduction sheet.
7, according to the overcurrent protection assembly of claim 6, it is characterized in that this on first the material of metallic conduction sheet and first time metallic conduction sheet be selected from: chromium, nickel, iron, cobalt, tungsten, titanium and alloy thereof.
8, according to the overcurrent protection assembly of claim 6, it is characterized in that this on second the material of metallic conduction sheet and second time metallic conduction sheet be selected from: copper, aluminium, tin, lead, silver, platinum, gold and alloy thereof.
9,, it is characterized in that the surface of at least one metallic conduction sheet has indentation according to the overcurrent protection assembly of claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02251831 CN2593323Y (en) | 2002-09-03 | 2002-09-03 | Overcurrent protection assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02251831 CN2593323Y (en) | 2002-09-03 | 2002-09-03 | Overcurrent protection assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2593323Y true CN2593323Y (en) | 2003-12-17 |
Family
ID=33721522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02251831 Expired - Fee Related CN2593323Y (en) | 2002-09-03 | 2002-09-03 | Overcurrent protection assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2593323Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI471874B (en) * | 2005-11-07 | 2015-02-01 | Tyco Electronics Raychem Kk | Ptc device, an electrical device comprising the ptc device and method of fabricating the electrical device |
-
2002
- 2002-09-03 CN CN 02251831 patent/CN2593323Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI471874B (en) * | 2005-11-07 | 2015-02-01 | Tyco Electronics Raychem Kk | Ptc device, an electrical device comprising the ptc device and method of fabricating the electrical device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20031217 |