CN2519390Y - Overcurrent protective element and its apparatus - Google Patents
Overcurrent protective element and its apparatus Download PDFInfo
- Publication number
- CN2519390Y CN2519390Y CN 01270789 CN01270789U CN2519390Y CN 2519390 Y CN2519390 Y CN 2519390Y CN 01270789 CN01270789 CN 01270789 CN 01270789 U CN01270789 U CN 01270789U CN 2519390 Y CN2519390 Y CN 2519390Y
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- over
- current
- protecting element
- sensing layer
- current protecting
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Abstract
The utility model discloses an over-current protective element and device, and the over-current protective element which comprises a first electrode foil, a second electrode foil and a plurality of current sensing layers is characterized in that a plurality of current sensing layers are electrically connected in series; the transition temperature of each current sensing layer differs by at least 5 DEG C; the over-current protective element can achieve the aims of high voltage resistance by controlling the resistance and the thickness of each current sensing layer. The over-current protective device comprises two or more types of current sensing layers connected in series, and the resistance value can change according to the voltage resistance requirement.
Description
Technical field
The utility model relates to the overcurrent protection technical field, and is particularly a kind of with different tool positive temperature coefficient conductive composite materials connected formed over-current protecting element and device thereof.
Background technology
Extensive use along with present portable electronic instrument; for example mobile phone, notebook computer, gun camera and personal digital aid (PDA) (PDA) etc.; for preventing secondary cell or circuit element generation overcurrent (over-current) or crossing high temperature (over-temperature) phenomenon and cause short circuit, use the importance of over-current protecting element also more and more remarkable.
Known over-current protecting element 10 comprises one first electrode foil 12, one second electrode foil 13 and a current sensing layer 11, as shown in Figure 1.When if this over-current protecting element 10 is used to protect secondary cell; then on the surface of first and second electrode foil 12,13, the one first metallic conduction sheet 14 and the second metallic conduction sheet 15 can be connected further, with the lead that is electrically connected as both positive and negative polarity with secondary cell.
At present, more common current sensing layer 11 is formed by an electric conducting material with positive temperature coefficient (Positive TemperatureCoefficient:PTC), comprises a polymer and a conductive filler.Because the resistance value of this PTC electric conducting material 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 and when temperature is risen, its resistance value can be increased to a high resistance state (for example 10 moment
4More than the ohm), and with excessive current reversal payment, to reach the purpose of protection battery or circuit element.
Generally speaking; it is the spring reaction of its resistance value to variations in temperature that the PTC over-current protecting element can be protected one of factor of battery or circuit element, and the spring reaction is bigger, and promptly resistance value is when temperature is higher than inversion temperature (Ts); promote more height, then over-current protecting element is withstand voltage higher.So-called spring reaction is that the temperature of working as current sensing layer rises because of the overcurrent phenomenon, and its resistance is by low resistance state (that is initial resistance value (R
Min)) moment rises to high resistance state (that is spike resistance value (R
Peak)) difference that showed, difference is bigger, and expression spring reaction is bigger, and the temperature of inversion temperature (Ts) when referring to that the resistance value of PTC current sensing element increases to 100 times of normal temperature resistance value.
Moreover, because the consumed energy (Power Dissipation:Pd) of over-current protecting element can following general formula: Pd=V
2/ R, wherein, V is its voltage that can bear, R is its spike resistance value.By above-mentioned general formula as can be known, when its spike resistance value more height, its spring reaction is bigger, and relatively its voltage that can bear is also healed high.
The method of the spike resistance value of known raising over-current protecting element is the content reduction with conductive filler (for example carbon black), yet this method can relatively promote its initial resistance value also, and its electrical conductivity is reduced.In view of this, the utility model at this problem provide a novelty can be high voltage withstanding over-current protecting element.
Summary of the invention
Main purpose of the present utility model provides a kind of over-current protecting element and device thereof; the stacked formation cascaded structure of its current sensing layer with two or more tool different resistance values and thickness; initial resistance value is reduced and raising spike resistance value, to improve its proof voltage.
Second purpose of the present utility model provides a kind of over-current protecting element and device thereof, and its resistance value can utilize the different current sensing layer of series connection to be changed, and makes it reach withstand voltage demand.
The 3rd purpose of the present utility model provides a kind of over-current protecting element and device thereof, and its resistance value can be by the inversion temperature of control each current sensing layer of being connected to variation of temperature, makes it reach demand to temperature and resistance.
For reaching above-mentioned purpose and avoiding the shortcoming of prior art, the utility model discloses an over-current protecting element and device thereof.This over-current protecting element comprises one first electrode foil, one second electrode foil and a plurality of high-molecular current-sensing layer; it is characterized in that these a plurality of high-molecular current-sensing layers form with stacked formation and in the connected in electrical series mode; first and second electrode foil is arranged on the corresponding surface of these a plurality of high-molecular current-sensing layers, and each high-molecular current-sensing layer inversion temperature differs at least 5 ℃.
The utility model can comprise two or more current sensing layer; make it form cascaded structure; this cascaded structure can engage via the tight each other layering of current sensing layer; the coupling mechanism (as conductive silver glue or metal forming etc.) that can also conduct electricity links current sensing layer; but and different thickness, resistance value and the inversion temperatures of each tool of PTC current sensing layer of each layer; so, the PTC over-current protecting element can be changed via thickness, resistance value and the inversion temperature of each layer its resistance value, demand withstand voltage, that reach temperature.
The utility model also can comprise a plurality of aforesaid over-current protecting elements, one first connecting portion, one second connecting portion and at least one insulating barrier.This first connecting portion comprises the first outer conductive member and one first conductive hole, and this first conductive hole first electrode foil and this first outer conductive member in order to be electrically connected these a plurality of over-current protecting elements.This second connecting portion comprises the second outer conductive member and one second conductive hole, and this second conductive hole second electrode foil and this second outer conductive member in order to be electrically connected these a plurality of over-current protecting elements.This insulating barrier is used to isolate adjacent over-current protecting element and isolates the over-current protecting element and the first and second outer conductive members, and this over-current protecting element design can be used for surface-mount device and uses.
Description of drawings
Fig. 1 is the profile of known over-current protecting element;
Fig. 2 is the profile according to the over-current protecting element of first embodiment of the present utility model;
Fig. 3 is the resistance-temperature profile of the utility model and known over-current protecting element;
Fig. 4 is the profile according to the over-current protecting element of second embodiment of the present utility model;
Fig. 5 is the profile according to the over-current protecting element of the 3rd embodiment of the present utility model;
Fig. 6 is the profile according to the overcurrent protective device of an embodiment of the present utility model.
Embodiment
The utility model discloses a kind of over-current protecting element, and it comprises two or more inversion temperature (Ts) and differs current sensing layer more than at least 5 ℃.The utility model makes it to form cascaded structure with each current sensing layer is stacked in addition, and the spike resistance value can be changed according to withstand voltage demand.
Initial resistance value (R in over-current protecting element of the present utility model
Min) and spike resistance value (R
Peak) can calculate and get by following general formula:
R
min＝R1
min×(t
1/t
0)+R2
min×(t
2/t
0)+R3
min×(t
3/t
0)+…
+Ri
min×(t
i/t
0)…… (1)
R
peak＝R1
peak×(t
1/t
0)+R2
peak×(t
2/t
0)+R3
peak×(t
3/t
0)+…
+Ri
peak×(t
i/t
0)…… (2)
R1 wherein
Min, R2
Min, R3
MinRi
MinBe respectively first, second, third to the i current sensing layer in t
0The initial resistance value of thickness; R1
Peak, R2
Peak, R3
Peak... Ri
PeakBe respectively first, second, third to the i current sensing layer in t
0The spike resistance value of thickness; t
1, t
2, t
3... t
iDifference A first, second, third ... the thickness of i current sensing layer; And t
0=t
1+ t
2+ t
3+ ... t
i
Fig. 2 is the profile according to the over-current protecting element 20 of first embodiment of the present utility model; comprise one first current sensing layer 21, one second current sensing layer 21 ', one first electrode foil 23 and one second electrode foil 22; this first electrode foil 23 is arranged at the surface of this first current sensing layer 21 with respect to second current sensing layer 21 ', and second electrode foil 22 is arranged on this second current sensing layer 21 ' surface with respect to first current sensing layer 21.This first electrode foil 23 and second electrode foil 22 are a metal conductive materials, for example: copper, nickel, platinum, gold and alloy thereof.
This first current sensing layer 21 and second current sensing layer 21 ' are all formed by the conducing composite material of a tool positive temperature coefficient (PTC).Wherein, this first current sensing layer 21 comprises one first polymer and one first conductive filler, and this second current sensing layer 21 ' comprises one second polymer and one second conductive filler.And this first polymer and this second polymer are identical or different polymer, for example: polyolefin polymers or epoxy resin etc.And this first conductive filler and this second conductive filler also can be identical or different conductive filler, for example carbon black, metal dust and pottery powder etc.The inversion temperature of this first current sensing layer 21 (Ts1) can be set at greater than 60 ℃, and the conversion temperature of this second current sensing layer 21 ' is crossed (Ts2) and first current sensing layer 21 and differed more than 5 ℃ (| Ts2-Ts1|＞5 ℃) at least.
Further; the volume resistance value of first current sensing layer 21 of over-current protecting element 20 of the present utility model is higher than this second current sensing layer more than 21 ' at least 20%, and the ratio of the thickness of first current sensing layer 21 and second current sensing layer 21 ' is between 0.01-0.96.
In the over-current protecting element 20 of first embodiment of the present utility model, if the volume resistance value of the monomer of first current sensing layer 21 is 1.43 ohm of centimetres (Ω .cm), when thickness is t
0When (0.21 millimeter (mm)), its initial resistance value (R1
Min) be 50 milliohms (m Ω), and its spike resistance value (R1
Peak) be 100 ohm, the volume resistance value of the monomer of second current sensing layer 21 ' is 3.14 ohm of centimetres (Ω .cm), when thickness is t
0The time, its initial resistance value (R2
Min) be 110 milliohms, and its spike resistance value (R2
Peak) be 100,000 ohm, when current sensing layer 21 with 21 ' series connection is fitted and the control gross thickness still is t
0, wherein the thickness ratio of first current sensing layer 21 and second current sensing layer 21 ' is 9: 1.Because the resistance of current sensing layer is directly proportional with its thickness; so; when first current sensing layer 21 and the 21 ' series connection of second current sensing layer, according to the calculating of equation (1) and (2), the initial resistance value of its formed over-current protecting element is 56 milliohm (R
MinAnd its spike resistance is 10090 ohm of (R=50m Ω * 0.9+110m Ω * 0.1=56m Ω),
Peak=100 Ω * 0.9+100,000 Ω * 0.1=10090 Ω).Hence one can see that, utilizes over-current protecting element of the present utility model, not only can increase the spike resistance value and can not sacrifice that it is initial than low-resistance value.
Figure 3 shows that the resistance-temperature profile of the utility model and known over-current protecting element; wherein; the over-current protecting element that the curve A representative is known with individual layer current sensing layer; it utilizes high-resistance PTC conducing composite material, and (its initial resistance value is 110m Ω; and the spike resistance value is 100,000 Ω) form.Curve B is represented another known over-current protecting element with individual layer current sensing layer, and it utilizes low-resistance PTC conducing composite material (its initial resistance value is 50m Ω, and the spike resistance value is 100 Ω) to be formed.Curve C is represented the over-current protecting element with double-deck current sensing layer of an embodiment of the present utility model, wherein should the bilayer current sensing layer with stacked formation of above-mentioned high-resistance PTC conducing composite material (account for gross thickness 10%) and low-resistance PTC conducing composite material (account for gross thickness 90%).Curve D is represented another known over-current protecting element with individual layer current sensing layer, precisely because current sensing layer is back formation that above-mentioned high-resistance PTC conducing composite material (percent by volume is 10%) and low-resistance PTC conducing composite material (percent by volume is 90%) are mixed.
By among Fig. 3 as can be known, over-current protecting element of the present utility model not only can reduce the initial resistance value of high-resistance conducing composite material, also can increase the spike resistance value and the outage speed (to the sensitivity of temperature) thereof of low-resistance conducing composite material.Moreover, by comparison curves C and curve D as can be known, the spike resistance value of double-deck current sensing layer of the present utility model and outage speed more directly will have high-resistance conducing composite material and have low-resistance conducing composite material and mixed the formed individual layer current sense floor height in back, and its inversion temperature also reduces relatively.That is over-current protecting element of the present utility model can make proof voltage improve and increase its sensitivity to temperature.
Further; the cascaded structure of over-current protecting element of the present utility model except can by current sensing layer each other closely layering engage and forming; also can utilize a conduction coupling mechanism (not shown) that current sensing layer is linked; wherein this conduction connect mechanism is arranged between the two high-molecular current-sensing layers and has high electrical conductivity material by one and formed; for example: conductive silver glue or metal forming etc., use the adjacent high-molecular current-sensing layer of electric binding two.
Fig. 4 is the profile according to the over-current protecting element 40 of second embodiment of the present utility model.This over-current protecting element 40 comprises one first current sensing layer 41; one second current sensing layer 41 '; one the 3rd current sensing layer 41 "; one first electrode foil 43 and one second electrode foil 42; wherein the inversion temperature of this first current sensing layer 41 (Ts1) can be set at greater than more than 60 ℃; and the inversion temperature of this second current sensing layer 41 ' (Ts2) and first current sensing layer 41 differ more than 5 ℃ (| Ts2-Ts1|＞5 ℃) at least, and the 3rd current sensing layer 41 " the inversion temperature of inversion temperature (Ts3) and second current sensing layer 41 ' differ more than 5 ℃ (| Ts3-Ts2|＞5 ℃) at least.This second electrode foil 42 is arranged on this first current sensing layer 41 surface with respect to second current sensing layer 41 ', and first electrode foil 43 is arranged at the 3rd current sensing layer 41 " on the surface with respect to second current sensing layer 41 '.
Over-current protecting element of the present utility model not only can be used as the usefulness of the circuit protection of secondary cell, also can be attached to circuit board surface with the usefulness as the protective circuit element.When being used for the circuit protection of secondary cell; over-current protecting element of the present utility model can further comprise one first conductive mechanism 54 and one second conductive mechanism 55; it is arranged at respectively on this first electrode foil 23 and second surface of electrode foil 22 with respect to current sensing layer 21 and 21 '; as shown in Figure 5; the direction that is provided with of this first conductive mechanism 54 and second conductive mechanism 55 is identical or opposite; and this first conductive mechanism 54 and second conductive mechanism 55 are a metallic conduction sheet or a lead, so that be electrically connected to the both positive and negative polarity of secondary cell or can directly insert in the circuit board.
In addition, the utility model can utilize a plurality of over-current protecting elements 20 first connecting portion 63 and second connecting portion, the 63 ' overcurrent protective device 60 that forms in parallel of a conductive material, in order to be attached on the circuit board (not shown), wherein this first connecting portion 63 comprises one first outer conductive member 64 and one first conductive hole (not shown), and this first conductive hole is in order to be electrically connected first electrode foil 23 and this first outer conductive member 64 of these a plurality of over-current protecting elements 20; This second connecting portion comprises the second outer conductive member 65 and one second conductive hole (not shown), and this second conductive hole is in order to be electrically connected second electrode foil 22 and this second outer conductive member 65 of these a plurality of over-current protecting elements, as shown in Figure 6.One end of first electrode foil 23 of each over-current protecting element 20 utilizes modes such as etching to form one first insulation layer 66 ', also utilizes etching mode to form one second insulation layer 66 and its second electrode foil 22 corresponds to the other end of this insulation layer 66 '.Over-current protecting element after the parallel connection can further comprise at least one insulating barrier 62.Wherein should the skin conductive member can utilize engraving method to form two conducting end 64 ', 64 " and 65 ', 65 ".In addition, utilize an insulating barrier 62 with as blocking between adjacent electrode foil and electrode foil and the outer conductive member.And utilize this skin conductive member 64,65 formed conducting end 64 ', 64 " and 65 ', 65 " be electrically connected to the circuit element of the external circuit board (scheming not shown), to protect this circuit element.
Technology contents of the present utility model and technical characterstic disclose as above, yet the personage who is familiar with this technology still may be based on teaching of the present utility model and announcement and done all replacement and modifications that does not deviate from the utility model spirit.Therefore, protection range of the present utility model should be not limited to those disclosed embodiments, and should comprise various do not deviate from replacement of the present utility model and modifications, and is contained by the scope of claims.
Claims (14)
1. over-current protecting element; comprise one first electrode foil, one second electrode foil and a plurality of high-molecular current-sensing layer; it is characterized in that: these a plurality of high-molecular current-sensing layers are formed in the connected in electrical series mode, and the inversion temperature of each high-molecular current-sensing layer differs at least 5 ℃.
2. over-current protecting element as claimed in claim 1 is characterized in that: wherein the inversion temperature of at least one high-molecular current-sensing layer is greater than 60 ℃.
3. over-current protecting element as claimed in claim 1 is characterized in that: wherein this first electrode foil and second electrode foil are metal conductive materials, and can electricly be linked to power end.
4. over-current protecting element as claimed in claim 1 is characterized in that: further comprise a conduction connect mechanism, be arranged between the two adjacent current sensing layer, use the adjacent high-molecular current-sensing layer of electric binding two.
5. over-current protecting element as claimed in claim 4 is characterized in that: wherein this conduction connect mechanism is conducting resinl or metal forming.
6. over-current protecting element as claimed in claim 1 is characterized in that: wherein these a plurality of high-molecular current-sensing layers comprise a polymer and a conductive filler.
7. over-current protecting element as claimed in claim 4 is characterized in that: wherein the polymer that comprised of each high-molecular current-sensing layer is identical or different kind.
8. over-current protecting element as claimed in claim 4 is characterized in that: wherein the conductive filler that comprised of each high-molecular current-sensing layer is identical or different kind.
9. over-current protecting element as claimed in claim 1 is characterized in that: wherein the volume resistance value of each high-molecular current-sensing layer differs at least 20%.
10. over-current protecting element as claimed in claim 1 is characterized in that: further comprise one first conductive mechanism and one second conductive mechanism, be arranged at this first electrode foil and the second electrode foil surface respectively.
11. over-current protecting element as claimed in claim 10 is characterized in that: wherein the direction that is provided with of this first conductive mechanism and second conductive mechanism is identical or opposite.
12. over-current protecting element as claimed in claim 10 is characterized in that: wherein this first and second conductive mechanism is a conducting strip or lead.
13. an overcurrent protective device is characterized in that: comprise:
At least one over-current protecting element as claimed in claim 1;
One first connecting portion comprises the first outer conductive member and one first conductive hole, this first conductive hole first electrode foil and this first outer conductive member in order to be electrically connected this at least one over-current protecting element;
One second connecting portion comprises the second outer conductive member and one second conductive hole, this second conductive hole second electrode foil and this second outer conductive member in order to be electrically connected this at least one over-current protecting element; And
At least one insulating barrier is used to isolate adjacent over-current protecting element and isolates the over-current protecting element and the first and second outer conductive members.
14. overcurrent protective device as claimed in claim 13 is characterized in that: wherein this first and second connecting portion utilizes a conductive material to form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01270789 CN2519390Y (en) | 2001-11-23 | 2001-11-23 | Overcurrent protective element and its apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01270789 CN2519390Y (en) | 2001-11-23 | 2001-11-23 | Overcurrent protective element and its apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2519390Y true CN2519390Y (en) | 2002-10-30 |
Family
ID=33676346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01270789 Expired - Lifetime CN2519390Y (en) | 2001-11-23 | 2001-11-23 | Overcurrent protective element and its apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2519390Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435447C (en) * | 2002-12-31 | 2008-11-19 | 聚鼎科技股份有限公司 | Over current protective element and its producing method |
| CN103531318A (en) * | 2013-10-23 | 2014-01-22 | 上海长园维安电子线路保护有限公司 | Over-current protective element with double PTC (Positive Temperature Coefficient) effect |
-
2001
- 2001-11-23 CN CN 01270789 patent/CN2519390Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435447C (en) * | 2002-12-31 | 2008-11-19 | 聚鼎科技股份有限公司 | Over current protective element and its producing method |
| CN103531318A (en) * | 2013-10-23 | 2014-01-22 | 上海长园维安电子线路保护有限公司 | Over-current protective element with double PTC (Positive Temperature Coefficient) effect |
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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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20111123 Granted publication date: 20021030 |