CN103093872B - A kind of circuit brake, installation method and battery - Google Patents
A kind of circuit brake, installation method and battery Download PDFInfo
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- CN103093872B CN103093872B CN201110348854.5A CN201110348854A CN103093872B CN 103093872 B CN103093872 B CN 103093872B CN 201110348854 A CN201110348854 A CN 201110348854A CN 103093872 B CN103093872 B CN 103093872B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The present invention relates to a kind of circuit brake, comprising: positive temperature coefficient temperature-sensitive key element layer (4); One the first metal layer (6), is used on the upside of it coupling a protective circuit, and the downside of described the first metal layer is coupled by the upside of a layer of solder paste (5) with described positive temperature coefficient temperature-sensitive key element layer (4); One second metal level (1,2), coupled by the downside of layer of solder paste (3) with described positive temperature coefficient temperature-sensitive key element layer (4) on the upside of it, the downside of described second metal level is used for coupling a shielded electrical equipment main body.In addition, the invention still further relates to for described circuit devcie being mounted to the method for electrical equipment main body and the battery with circuit brake of the present invention.
Description
Technical Field
The present invention relates to the field of circuit protection, and more particularly, to a circuit protection device, an installation method for the circuit protection device, and a battery having the circuit protection device.
Background
PTC is the abbreviation of posivetterTemperatureCoefficient, and PTC devices, positive temperature coefficient heat-sensitive devices, can protect circuits when the current is too high and the temperature is too high. When in use, the resistor is connected in series in the circuit, and under the normal condition, the resistance value and the loss are very small, so that the normal work of the circuit is not influenced; however, if an overcurrent (such as a short circuit) occurs, the temperature of the circuit rises, and the resistance value of the circuit rises rapidly along with the temperature rise, so that the effect of limiting the current is achieved, and the components in the circuit are prevented from being damaged. When the fault is removed, the temperature of the PTC device automatically drops and returns to the low-resistance state, so the PTC device is also called a resettable fuse. And thus are widely used in the battery industry such as mobile phone batteries, digital batteries, laptop computer batteries, and the like.
The conventional PTC strip-shaped protection device 20 for a battery generally has a structure as shown in fig. 1, in which a metal electrode (usually a nickel strip) is led out from each of the upper and lower surfaces of the PTC, one nickel strip is welded to the bottom of the battery 21 (or to the upper cover plate of the battery, or to the battery rivet), and the other nickel strip of the PTC device 20 is connected to the battery protection circuit board 22 or an external circuit, so as to achieve the safety protection function of the PTC against the overcurrent and/or overcharge of the battery. Such a construction requires more nickel strap and is not flexible enough because of the relatively fixed manner of mounting. In addition, the relative fixation of the installation mode also limits the flexibility and diversity of the installation method.
Disclosure of Invention
According to a first aspect of the present invention, there is provided a device for circuit protection, comprising: a positive temperature coefficient heat sensitive element layer; the upper side of the first metal layer is coupled with a protective circuit, and the lower side of the first metal layer is coupled with the upper side of the positive temperature coefficient heat-sensitive element layer through a solder paste layer; and the upper side of the second metal layer is coupled with the lower side of the positive temperature coefficient thermosensitive element layer through a solder paste layer, and the lower side of the second metal layer is used for coupling a protected electric appliance main body. The circuit protection device according to the first aspect of the present invention can be directly mounted on the surface of the battery without an additional nickel tape for connection, thereby simplifying the mounting process of the battery manufacturer and further reducing the process cost and the material cost.
Preferably, the second metal layer comprises at least one first sub-layer and one second sub-layer, wherein the first sub-layer is coupled with the lower side of the ptc thermistor layer, the second sub-layer is used for coupling the protected appliance body, and the two sub-layers are coupled by rolling, chemical plating or electrodeposition. The advantage is that providing two sub-layers to couple the PTC layer and the appliance body, respectively, allows for a flexible optimization of the quality of the coupling.
Preferably, the first sub-layer comprises a first material suitable for coupling with the ptc thermistor layer, the first material comprising nickel, and the second sub-layer comprises a second material suitable for coupling with the protected appliance body, the second material comprising aluminum. The advantage is that, because the PTC thermistor layer has different coupling characteristics with the surface of the appliance body, the metal better suited for coupling with the PTC thermistor layer can be flexibly selected as the first sub-layer, and similarly, the metal better suited for coupling with the appliance body can be selected as the second sub-layer, which can provide the quality of optimized coupling. More specifically, on the one hand, nickel can be better suited to be coupled to the ptc thermistor layer by welding; on the other hand, the main body of the electric appliance is mostly made of aluminum at present, so that the aluminum is selected as the composition material of the second sub-layer, the coupling quality can be better ensured, and the heat generated by the protected main body of the electric appliance can be better transferred to the positive temperature coefficient heat-sensitive element layer without loss because the aluminum is a good conductor, so that the protection function of the whole device is more accurate.
Preferably, for the circuit protection device, the second metal layer has an extension portion located outside the first metal layer and the positive temperature coefficient heat-sensitive element layer edge. The extension of the second metal layer may be for coupling with an appliance body. Preferably, the extension of the second metal layer is located at one end of the second metal layer; or the extension parts of the second metal layer are positioned at two ends of the second metal layer. The two optimal schemes provide a more flexible installation selection mode for an electric appliance main body installation manufacturer, so that the manufacturer can select a structure mode suitable for own products according to the size specification and position requirements of the own products.
According to a second aspect of the present invention there is provided a method for mounting a circuit protection device according to the first aspect of the present invention to a protected appliance body, wherein the method is particularly suitable for mounting of the protection device when the second metal layer has an extension and the extension is located beyond the edges of the first metal layer and the ptc thermistor layer. The method comprises the following steps: coupling the lower side of the first metal layer and the upper side of the positive temperature coefficient heat-sensitive element layer together through a solder paste layer; coupling the lower side of the positive temperature coefficient heat-sensitive element layer and the upper side of the second metal layer together through a solder paste layer; welding the coupled first metal layer, the positive temperature coefficient heat-sensitive element layer and the second metal layer to form the circuit protection device whole; and welding the second metal layer on the surface of the electric appliance main body through the extension part of the second metal layer of the circuit protection device. Preferably, the welding of the second metal layer to the appliance body uses any one of the following welding methods: laser welding and ultrasonic welding. The advantage of this approach is that a single device can be formed that is easily soldered to the appliance body, facilitating mass production, distribution and installation.
According to a third aspect of the present invention there is provided a method for mounting a circuit protection device to a protected appliance body, the method comprising the steps of: welding the underside of the second metal layer to the surface of the protected appliance body; laminating the positive temperature coefficient heat-sensitive element layer and the first metal layer on the upper side of the second metal layer welded on the surface of the electric appliance body sequentially through a soldering paste layer; and welding the superposed circuit protection devices together. And preferably, the welding the second metal layer to the appliance body uses any one of the following welding methods: laser welding and ultrasonic welding; and the welding the superposed circuit protection devices together uses any one of the following welding methods: and (5) reflow soldering. The circuit protection device has the advantages that as most of components of the circuit protection device are completed by reflow soldering, the temperature is easier to control in the soldering process, oxidation can be avoided, and the cost can be better controlled.
According to a fourth aspect of the present invention there is provided a battery with a circuit protection device according to the first aspect of the present invention.
The invention provides a method for directly installing a circuit protection device on the surface of a protected electric appliance main body by laser welding or ultrasonic welding, and a metal belt (usually a nickel belt or a nickel-plated steel belt) for connecting the circuit protection device and a protection plate (or an external circuit load) of the electric appliance main body can be directly connected with the surface of the circuit protection device by resistance welding or laser welding. The invention solves the technical problem that the current circuit protection device can not be directly arranged on the surface of the electric appliance main body. The installation position of the circuit protection device on the electric appliance main body can be the top, the bottom or the side of the electric appliance main body.
Drawings
Fig. 1 shows a schematic view of a battery having a conventional ribbon-shaped PTC device;
FIG. 2 illustrates a schematic structural diagram of a circuit protection device according to one embodiment of the present invention;
FIG. 3 shows a schematic structural diagram of a circuit protection device according to another embodiment of the present invention;
FIG. 4 is a schematic diagram showing three mounting positions of the circuit protection device according to the present invention;
Detailed Description
Although the following text sets forth a detailed description of numerous different embodiments of the invention, it should be understood that the legal scope of the invention is defined by the words of the claims set forth at the end of this patent. The detailed description is to be construed as exemplary only and does not describe every possible embodiment of the invention since describing every possible embodiment would be impractical, if not impossible. Numerous alternative embodiments could be implemented, using either current technology or technology developed after the filing date of this patent, which would still fall within the scope of the claims defining the invention.
Fig. 2 shows a schematic structural diagram of a circuit protection device according to an embodiment of the present invention. In the illustrated circuit protection device, there are included: a PTC element layer 4; a first metal layer 6 and a second metal layer comprising a first sublayer 2 and a second sublayer 1. Wherein the lower side of the first metal layer 6 is coupled to the upper side of the PTC element layer through the first solder paste layer 5, and the upper side of the first metal layer 6 is used for coupling to a protection circuit; the first sublayer 2 of the second metal layer is coupled to the underside of the PTC element layer by a second solder paste layer 3, while the second sublayer of the second metal layer is used to couple the protected appliance body.
Also, the second sub-layer typically comprises aluminum for better coupling with the appliance body, typically aluminum, by welding, such as laser welding or ultrasonic welding. The first sub-layer usually contains nickel in order to better couple with the PTC element layer 4 by means of a suitable soldering method and by means of a solder paste layer. Wherein the second sublayer comprising aluminum and the first sublayer comprising nickel are typically formed by rolling, electroless plating or electrodeposition to form an aluminum-nickel composite layer, i.e., a second metal layer. Furthermore, the first metal layer may be a nickel or nickel-plated steel strip, which may be coupled to the upper side of the PTC element layer by means of a solder paste layer through various welding methods. In this design, the second metal layer, i.e., the alnico composite strip, has an extension located at one end of the alnico composite strip and outside the edges of the first metal layer and the PTC element layer for welding to the protected appliance body surface. It is understood that metallic aluminum and metallic nickel are merely examples, and are each any material suitable for welding together with the material to which it is coupled.
Fig. 3 shows a schematic structural diagram of a circuit protection device according to another embodiment of the present invention. Compared with the structure of the circuit protection device of the embodiment shown in fig. 2, the main difference is that in fig. 2, the extension parts of the aluminum-nickel composite strip are positioned at two ends of the aluminum-nickel composite strip; in fig. 3, the extension of the aluminum nickel composite strip is located at one end of the aluminum nickel composite strip. The two different structural modes facilitate the application of the circuit protection device to different occasions. Other structural features are substantially the same as those of the embodiment shown in fig. 2 and will not be described again.
Fig. 4 shows a schematic view of the mounting position of the circuit protection device 10 according to the present invention. The circuit protection device according to the embodiment of the present invention shown in fig. 2 and 3 is greatly advantageous in that it can be installed at any position of an electric appliance main body such as a battery body, for example, at the upper side, the lower side, and the side of the battery body 11 as shown in fig. 4, which provides great flexibility in the production of the battery. Of course, the circuit protection device 10 according to the present invention can be installed on the front side and the rear side with the largest area as shown in fig. 4 in theory, but generally, the application of installing the circuit protection device on the front side and the rear side of the battery is less common based on the technical requirements of the battery and the device for installing the battery, such as the requirement of making the battery and the device using the battery as thin as possible.
The invention has been described above from an apparatus point of view and is further explained below on the basis of a method.
A method of mounting a circuit protection device according to an embodiment of the present invention will be described first. The mounting method will now be described in detail by taking as an example the circuit protection device in the embodiment illustrated in fig. 2.
First, the lower side of the first metal layer and the upper side of the PTC element layer are coupled together by a solder paste layer.
The lower side of the PTC element layer and the upper side of the second metal layer are then coupled together by a solder paste layer.
And then welding the coupled first metal layer, the positive temperature coefficient heat-sensitive element layer and the second metal layer to form the circuit protection device whole body. The welding mode can be laser welding, ultrasonic welding or reflow welding.
Finally, the second metal layer is welded to a desired portion of the surface of the electric appliance main body by an extending portion of the second metal layer of the circuit protection device as a whole. The welding is preferably laser welding or ultrasonic welding. Thereby completing the entire process of mounting the circuit protection device to the battery.
The first metal layer is a nickel or nickel-plated steel strip, the soldering paste layer can be soldering paste, the second metal layer is a nickel-aluminum composite strip formed by rolling, chemical plating or electro-deposition, the upper side is nickel, and the lower side is aluminum.
The present invention also proposes another mounting method of a circuit protection device according to another embodiment of the present invention. The mounting method will be described in detail by taking the circuit protection device in the embodiment illustrated in fig. 2 as an example.
Firstly, welding the lower side of the second metal layer on the surface of the electric appliance main body, namely independently welding an aluminum-nickel composite strip on a desired position on the surface of a battery through an aluminum layer of the aluminum-nickel composite strip;
then, the PTC element layer and the first metal layer, i.e., the nickel or nickel-plated steel strip, are sequentially stacked on the upper side of the second metal layer, i.e., the nickel layer of the aluminum-nickel composite strip, which is welded on the surface of the battery body, through a solder paste layer, e.g., solder paste;
and finally, welding the stacked circuit protection devices comprising the nickel or nickel-plated steel strip, the welding paste layer, the PTC element layer and the aluminum-nickel composite strip together so as to finish the whole process of mounting the circuit protection devices to the battery. Wherein the soldering is preferably reflow soldering.
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and exemplary and not restrictive in character; the present invention is not limited to the above-described embodiments.
Other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a study of the specification, the disclosure, the drawings, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality. In practical applications of the invention, one element may perform the functions of several technical features recited in the claims. Any reference signs in the claims shall not be construed as limiting the scope.
Claims (9)
1. A circuit protection device comprising:
a positive temperature coefficient heat-sensitive element layer (4);
a first metal layer (6) with the upper side coupled with a protection circuit, and the lower side coupled with the upper side of the positive temperature coefficient heat-sensitive element layer (4) through a first solder paste layer (5);
a second metal layer (1, 2), the upper side of which is coupled with the lower side of the positive temperature coefficient heat-sensitive element layer (4) through a second solder paste layer (3), and the lower side of the second metal layer is used for coupling with a protected electric appliance main body;
wherein the second metal layer has an extension part, the extension part is positioned outside the edges of the first metal layer and the PTC thermistor layer, and the second metal layer is welded on the surface of the electric appliance main body through the extension part.
2. The circuit protection device according to claim 1, wherein said second metal layer comprises at least a first sub-layer (2) and a second sub-layer (1), wherein said first sub-layer (2) is coupled to the underside of said PTC thermistor layer (4), and said second sub-layer (1) is used for coupling to said protected appliance body, and said two sub-layers are coupled by rolling, electroless plating or electrodeposition.
3. The circuit protection device of claim 2, wherein said first sub-layer comprises a first material suitable for coupling with said positive temperature coefficient thermal element layer, the first material comprising nickel, and said second sub-layer comprises a second material suitable for coupling with said protected appliance body, the second material comprising aluminum.
4. The circuit protection device of claim 1, wherein the extension of the second metal layer is located at one end of the second metal layer; or,
the extension parts of the second metal layer are positioned at two ends of the second metal layer.
5. A method for mounting the circuit protection device of any one of claims 1 to 4 to a protected appliance body, comprising the steps of:
-coupling together the lower side of the first metal layer (6) and the upper side of the positive temperature coefficient heat-sensitive element layer (4) by a first solder paste layer (5);
-coupling together the lower side of the positive temperature coefficient thermal element layer (4) and the upper side of the second metal layer (1, 2) by a second solder paste layer (3);
-soldering the coupled first metal layer (6), PTC thermistor layer (4) and second metal layers (1, 2) to form the circuit protection device as a whole; and
-welding said second metal layer to said appliance body surface through an extension of said second metal layer of said circuit protection device as a whole.
6. The method of claim 5, wherein welding the second metal layer to the appliance body uses any one of the following welding methods:
laser welding and ultrasonic welding.
7. A method for mounting the circuit protection device of any one of claims 1 to 4 to a protected appliance body, comprising the steps of:
-welding the underside of the second metal layer to the surface of the protected appliance body;
-superimposing the layer of positive temperature coefficient thermal element (4) and the first metal layer (6) on the upper side of the second metal layer welded on the surface of the appliance body, successively by a second layer of solder paste (3) and a first layer of solder paste (5); and
-soldering together the stacked circuit protection devices.
8. The method of claim 7, wherein the welding the second metal layer to the appliance body uses any one of the following welding methods:
laser welding and ultrasonic welding;
and the welding of the stacked circuit protection devices uses reflow welding.
9. A battery characterized by being mounted with a circuit protection device according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110348854.5A CN103093872B (en) | 2011-11-07 | 2011-11-07 | A kind of circuit brake, installation method and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110348854.5A CN103093872B (en) | 2011-11-07 | 2011-11-07 | A kind of circuit brake, installation method and battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103093872A CN103093872A (en) | 2013-05-08 |
| CN103093872B true CN103093872B (en) | 2016-04-06 |
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| CN201110348854.5A Expired - Fee Related CN103093872B (en) | 2011-11-07 | 2011-11-07 | A kind of circuit brake, installation method and battery |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691688A (en) * | 1994-07-20 | 1997-11-25 | Therm-O-Disc, Incorporated | PTC device |
| JP2002110403A (en) * | 2000-09-29 | 2002-04-12 | Tdk Corp | Polymer ptc device |
| JP2002373642A (en) * | 2001-06-14 | 2002-12-26 | Matsushita Electric Ind Co Ltd | Sealed battery |
| CN101226995A (en) * | 2007-01-18 | 2008-07-23 | 三星Sdi株式会社 | rechargeable battery |
| CN101430956A (en) * | 2007-11-08 | 2009-05-13 | 三星Sdi株式会社 | PTC device, protective circuit module including the same, and secondary battery including the protective circuit module |
| CN101667664A (en) * | 2008-09-03 | 2010-03-10 | 三星Sdi株式会社 | Protection circuit board, battery pack and method for connecting them |
| CN102064304A (en) * | 2009-11-16 | 2011-05-18 | 三星Sdi株式会社 | Safety element assembly |
-
2011
- 2011-11-07 CN CN201110348854.5A patent/CN103093872B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691688A (en) * | 1994-07-20 | 1997-11-25 | Therm-O-Disc, Incorporated | PTC device |
| JP2002110403A (en) * | 2000-09-29 | 2002-04-12 | Tdk Corp | Polymer ptc device |
| JP2002373642A (en) * | 2001-06-14 | 2002-12-26 | Matsushita Electric Ind Co Ltd | Sealed battery |
| CN101226995A (en) * | 2007-01-18 | 2008-07-23 | 三星Sdi株式会社 | rechargeable battery |
| CN101430956A (en) * | 2007-11-08 | 2009-05-13 | 三星Sdi株式会社 | PTC device, protective circuit module including the same, and secondary battery including the protective circuit module |
| CN101667664A (en) * | 2008-09-03 | 2010-03-10 | 三星Sdi株式会社 | Protection circuit board, battery pack and method for connecting them |
| CN102064304A (en) * | 2009-11-16 | 2011-05-18 | 三星Sdi株式会社 | Safety element assembly |
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| CN103093872A (en) | 2013-05-08 |
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Address after: Xuhui District Caohejing Development Zone of Shanghai City, Qinzhou road 200233 No. 307 Patentee after: Shanghai Li Tao Electronics Co., Ltd. Address before: Xuhui District Caohejing Development Zone of Shanghai City, Qinzhou road 200233 No. 307 Patentee before: Raychem Electronics (Shanghai) Co., Ltd. |
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