CN202042875U - Thin type circuit protection device - Google Patents
Thin type circuit protection device Download PDFInfo
- Publication number
- CN202042875U CN202042875U CN2011201499150U CN201120149915U CN202042875U CN 202042875 U CN202042875 U CN 202042875U CN 2011201499150 U CN2011201499150 U CN 2011201499150U CN 201120149915 U CN201120149915 U CN 201120149915U CN 202042875 U CN202042875 U CN 202042875U
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- China
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- electric pole
- bimetal leaf
- protection device
- circuit protection
- ptc thermistor
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Abstract
The utility model relates to a thin type circuit protection device which comprises a bimetallic strip, a PTC (Positive Temperature Coefficient) resistor, an upper electric pole and a lower electric pole, wherein the PTC resistor is provided with a hollow cavity, the bimetallic strip is arranged in the hollow cavity, the upper electric pole and the lower electric pole are respectively adhered on the upper surface and the lower surface of the PTC and are packaged to form an enclosed structure, the bimetallic strip is tightly contacted with the inner surfaces of the upper electric pole and the lower electric pole at the same time and is connected with the PTC resistor in parallel, one electric pole of the upper electric pole and the lower electric pole forms a conductive part at the middle part of the inner surface of the corresponding hollow cavity, and an insulated part is formed at the periphery of the inner surface of the corresponding hollow cavity; the middle part of the inner surface of the other electric pole forms an insulated part, and an conductive part is formed at the periphery of the inner surface of the other electric pole; the bimetallic strip is in a warping state, and contacts which are respectively contacted with the conductive parts of the upper electric pole and the lower electric pole and are connected in the circuit are arranged at the middle part and the edge of the bimetallic strip; or the bimetallic strip is warped reversely, and the contacts are separated from the conductive parts of the upper electric pole and the lower electric pole. The thin type circuit protection device has the advantages that the circuit can be controlled to be disconnected or connected by the deformation of the bimetallic strip, the thin type circuit protection device has a simple structure and reliable performance, and the thinness and smallness of the device can meet the miniaturization requirement of the electronic device.
Description
Technical field
The utility model relates to a kind of slim circuit protection device, and particularly a kind of is main temperature-sensing element with bimetal leaf, and self-healing circuit protection device after self-locking and the fault can realize fault the time.
Background technology
The overcurrent circuit protection device has obtained extensive use at numerous areas such as household electrical appliance, mobile phone, automobiles.In recent years, be accompanied by miniaturization, the high performance development trend of electronics industry, also more and more require the overcurrent circuit protection device that physical dimension is little, security performance is high.
In the overcurrent circuit protection system such as battery of mobile phone, be accompanied by the perfect day by day of present cell-phone function, the needed electric current of mobile phone is also increasing, and the electric current that the overcurrent circuit protection system will be able to bear is also increasing; The integrated level of mobile phone is but more and more higher simultaneously, and the space of leaving circuit protection device for is more and more littler.Same variation takes place in other every field, and the overcurrent circuit protection device of miniaturization, high performance has become present active demand.
Summary of the invention
Technical problem to be solved in the utility model is at the problems referred to above of overcurrent circuit protection device and requirement and a kind of slim circuit protection device that designs.
The utility model solves the problems of the technologies described above the technical scheme of being taked: a kind of slim circuit protection device; comprise bimetal leaf, PTC thermistor and upper and lower electrode; described PTC thermistor has cavity; bimetal leaf places this cavity; above and below and encapsulation that upper and lower electrode is attached to the PTC thermistor respectively form closed structure, and bimetal leaf closely contacts with the inner surface of upper and lower electrode simultaneously, and is connected in parallel with PTC thermistor electricity; wherein
In the described upper and lower electrode, wherein an electrode forms current-carrying part at the inner surface middle part of corresponding cavity, the periphery of inner surface forms insulated part, and another electrode forms insulated part at the inner surface middle part of corresponding cavity, and off-balancesheet is enclosed the formation current-carrying part in it;
Described bimetal leaf is the warpage state, and its middle part and edge are equipped with the contact;
The contact of bimetal leaf contacts respectively with the current-carrying part of upper and lower electrode, and bimetal leaf is connected into circuit; Perhaps, the reverse buckling deformation of bimetal leaf, the current-carrying part of its contact and upper and lower electrode is thrown off.
Of the present utility model simple in structure; dependable performance; device geometries can be accomplished thin and little; can satisfy the requirement of miniaturization day by day of present electronic device; simultaneously processing technology simple, be suitable for large-scale production; cost is lower, and compares with single PTC circuit protection device, can satisfy the needs by big electric current.
Concrete, in normal operation, the contact of bimetal leaf contacts with the current-carrying part of upper and lower electrode, and circuit is connected, and electric current flows into from an electrode, passes through bimetal leaf and PTC thermistor in parallel respectively, flows out from another electrode.
Under the abnormal work state, the deformation of bimetal leaf generation warpage, its contact and upper and lower electrodes conduct are partly thrown off, then contact with insulated part, and this moment, bimetal leaf was not connected into circuit, and electric current mainly flows through from the PTC thermistor.And the PTC thermistor can move rapidly and present high-impedance state and produce heat, keeps bimetal leaf and remains on reverse buckling deformation state, until the conducting voluntarily of fault eliminating circuit.
On the basis of such scheme, the middle part of the inner surface of described top electrode forms current-carrying part, and is coated with the contact, and the peripheral insulated part that forms is covered by insulating material; The inner surface middle part of bottom electrode forms insulated part, covered by insulating material, and the peripheral current-carrying part that forms, and be coated with the contact.
On the basis of such scheme, the middle part of described bottom electrode is provided with a kick.
On the basis of such scheme, the cavity of described cavity for constituting, or the combined formation cavity of two or more than two PTC thermistor of serving as reasons by a PTC thermistor.
On the basis of such scheme, described bimetal leaf and upper and lower electrode all are coated with the contact in the part that electrically contacts mutually.
On the basis of such scheme, the room temperature resistance of described PTC thermistor is not less than 10 times of contact resistance between bimetal leaf and the upper and lower electrode.Because the contact resistance between bimetal leaf and the electrode is much smaller than the room temperature resistance of PTC parts, in normal operation, electric current mainly flows through from bimetal leaf.
The beneficial effects of the utility model are:
1, adopt the PTC parts to constitute the structure of cavity, bimetal leaf places in the cavity, has reduced the thickness of device greatly, is beneficial to the requirement of device miniaturization;
2, adopt electrode pair to answer the surface of cavity part to make insulated part and current-carrying part, bimetal leaf is by the deformation action of self, decide itself and the contacting of electrode insulation part or current-carrying part, thereby realize that circuit disconnects or closed controlling Design, removed the needed transfer arm of traditional design from, reduce parts, also reduced size of devices;
3, electrode pair is answered the insulated part and the current-carrying part on the surface of cavity part, can adopt the printing technology of hyundai electronics industry to finish.Manufacturing process is simple, is suitable for large-scale production, simultaneously because the minimizing of parts greatly reduces the device production manufacturing cost;
4, device adopts the mode of PTC and bimetal leaf combination, compares with single PTC circuit protection device, can satisfy the needs by big electric current.Compare with single bimetal leaf circuit protection device, can realize self-locking and self-recovering function.
Description of drawings
Fig. 1 is the plan structure schematic diagram of the utility model embodiment 1 protective device.
Fig. 2 is the utility model embodiment 1 protective device side cross-sectional view in normal operation.
Fig. 3 is the side cross-sectional view of the utility model embodiment 1 protective device under the protection operate condition.
Fig. 4 is the upper electrode arrangement schematic diagram of the utility model embodiment 1 protective device.
Fig. 5 is the lower electrode arrangement schematic diagram of the utility model embodiment 1 protective device.
Fig. 6 is the plan structure schematic diagram of the utility model embodiment 2 protective devices.
Label declaration in the accompanying drawing
1-PTC thermistor 2-cavity
3-bimetal leaf 4, the upper and lower electrode of 5-
6,10-current-carrying part 7,11-insulated part
8, the contact of 9-bimetal leaf.
Embodiment
See also the plan structure schematic diagram of Fig. 1 for the utility model embodiment 1 protective device; Fig. 2 is the utility model embodiment 1 protective device side cross-sectional view in normal operation; Fig. 3 is the side cross-sectional view of the utility model embodiment 1 protective device under the protection operate condition; Fig. 4 is that upper electrode arrangement schematic diagram and Fig. 5 of the utility model embodiment 1 protective device is shown in the lower electrode arrangement schematic diagram of the utility model embodiment 1 protective device; a kind of slim circuit protection device; comprise bimetal leaf 3; PTC thermistor 1 and on; bottom electrode 4; 5; described PTC thermistor 1 has cavity 2; bimetal leaf 3 places this cavity 2; on; bottom electrode 4; 5 be attached to respectively PTC thermistor 1 on; below and encapsulation form closed structure; bimetal leaf 3 is with last; bottom electrode 4; 5 inner surface is closely contact simultaneously; and be connected in parallel with PTC thermistor 1 electricity; wherein
In the described upper and lower electrode 4,5, described top electrode 4 forms current-carrying part 6 at the inner surface middle part of corresponding cavity 2, and is coated with as superior electrical conductivity materials such as copper, zinc, tin, the peripheral insulated part 7 that forms by insulating material covered; Bottom electrode 5 forms by the insulated part 11 that insulating material covered at the inner surface middle part of corresponding cavity 2, and the peripheral current-carrying part 10 that is coated with the superior electrical conductivity material that forms;
Described bimetal leaf 3 is the warpage state, and the middle part of its upper surface is provided with contact 8, and four jiaos of places, the edge of lower surface are equipped with contact 9.
(see figure 2) in normal operation, the contact 8 at bimetal leaf 3 middle parts contacts with the current-carrying part 6 of top electrode 4, and the contact 9 that bimetal leaf 3 edges are four jiaos contacts with the current-carrying part 10 of bottom electrode 5, and circuit is connected.This moment electric current from power on the utmost point 4 enter, pass through bimetal leaf 3 and PTC thermistor 1 respectively, flow out from bottom electrode 5, and since the contact resistance between bimetal leaf and the electrode much smaller than the room temperature resistance of PTC parts, electric current mainly flows through from bimetal leaf 3.
(see figure 3) under the abnormal work state, produce a large amount of heat on bimetal leaf 3 and the contact 8,9 thereof, make bimetal leaf generation deformation (warpage is owing to constitute due to the coefficient of expansion difference of two kinds of metal materials of bimetal leaf), the result makes the contact 8 at bimetal leaf 3 middle parts throw off mutually with the current-carrying part 6 of top electrode 4, throw off mutually with the current-carrying part 10 of bottom electrode 5 contact 9 that bimetal leaf 3 edges are four jiaos, then contact with the insulated part 7,11 of upper/lower electrode.At this moment, bimetal leaf 3 is not connected into circuit, and the electric current utmost point 4 from power on enters, and through PTC thermistor 1, flows out from bottom electrode 5.
See also Fig. 6 for shown in the plan structure schematic diagram of the utility model embodiment 2 protective devices, a kind of slim circuit protection device includes the PTC thermistor 1,1 ' of bimetal leaf 3, two L fonts and upper and lower electrode 4,5.
Claims (6)
1. slim circuit protection device; comprise bimetal leaf (3); PTC thermistor (1) and on; bottom electrode (4; 5); it is characterized in that: described PTC thermistor (1) has cavity (2); bimetal leaf (3) places this cavity (2); on; bottom electrode (4; 5) be attached to respectively PTC thermistor (1) on; below and encapsulation form closed structure; bimetal leaf (3) is with last; bottom electrode (4; 5) inner surface is closely contact simultaneously; and be connected in parallel with PTC thermistor (1) electricity; wherein
In the described upper and lower electrode (4,5), wherein an electrode forms current-carrying part at the inner surface middle part of corresponding cavity (2), peripheral formation insulated part, and another electrode forms insulated part at the inner surface middle part of corresponding cavity (2), the peripheral current-carrying part that forms;
Described bimetal leaf (3) is the warpage state, and its middle part and edge are respectively equipped with contact (8,9);
The contact of bimetal leaf (3) (8,9) contacts respectively with the current-carrying part of upper and lower electrode (4,5), and bimetal leaf is connected into circuit; Perhaps, oppositely buckling deformation of bimetal leaf (3), the current-carrying part of its contact and upper and lower electrode (4,5) is thrown off.
2. slim circuit protection device according to claim 1 is characterized in that: the inner surface middle part of described top electrode (4) forms current-carrying part (6), and is coated with electric conducting material, and the peripheral insulated part (7) that forms is covered by insulating material; The inner surface middle part of bottom electrode (5) forms insulated part (11), covered by insulating material, and the peripheral current-carrying part (10) that forms, and be coated with electric conducting material.
3. slim circuit protection device according to claim 2 is characterized in that: the middle part of described bottom electrode (5) is provided with a kick.
4. according to the described slim circuit protection device of one of claim 1 to 3; it is characterized in that: the cavity of described cavity (2) for constituting, or the combined formation cavity of two or more than two PTC thermistor (1,1 ') of serving as reasons by a PTC thermistor (1).
5. slim circuit protection device according to claim 1 is characterized in that: described bimetal leaf (3) all is coated with the contact with upper and lower electrode (4,5) in the part that electrically contacts mutually.
6. slim circuit protection device according to claim 1 is characterized in that: the room temperature resistance of described PTC thermistor (1) is not less than 10 times of contact resistance between bimetal leaf (3) and the upper and lower electrode (4,5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201499150U CN202042875U (en) | 2011-05-12 | 2011-05-12 | Thin type circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201499150U CN202042875U (en) | 2011-05-12 | 2011-05-12 | Thin type circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202042875U true CN202042875U (en) | 2011-11-16 |
Family
ID=44970301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201499150U Expired - Lifetime CN202042875U (en) | 2011-05-12 | 2011-05-12 | Thin type circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202042875U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159354A (en) * | 2015-03-25 | 2016-11-23 | 北京波士顿动力电池有限公司 | A kind of Novel power battery module safeguard construction |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
-
2011
- 2011-05-12 CN CN2011201499150U patent/CN202042875U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159354A (en) * | 2015-03-25 | 2016-11-23 | 北京波士顿动力电池有限公司 | A kind of Novel power battery module safeguard construction |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI CHANGYUAN WAYON CIRCUIT PROTECTION CO., L Free format text: FORMER NAME: SHANGHAI CHANGYUAN WEIAN ELECTRONIC LINE PROTECTION CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Seven road 201202 Shanghai Pudong New Area Shiwan No. 1001 Patentee after: Shanghai Changyuan Wayon Circuit Protection Co., Ltd. Address before: Seven road 201202 Shanghai Pudong New Area Shiwan No. 1001 Patentee before: Shanghai Changyuan Wayon Circuit Protection Co., Ltd. |
|
| CP03 | Change of name, title or address |
Address after: 200083 806, floor 8, No. 125, Liuying Road, Hongkou District, Shanghai Patentee after: Shanghai Wei'an Electronic Co., Ltd Address before: Seven road 201202 Shanghai Pudong New Area Shiwan No. 1001 Patentee before: Shanghai Changyuan Wayon Circuit Protection Co.,Ltd. |
|
| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111116 |
|
| CX01 | Expiry of patent term |