KR101395495B1 - The complex protection device of blocking the abnormal state of current and voltage - Google Patents

Abstract

The present invention relates to a complex protection device for blocking an abnormal current and an abnormal voltage and, more particularly, to a complex protection device for blocking an abnormal current and an abnormal voltage, capable of improving the durability of a resistive element by forming the resistive element with a structural shape, applying surface mount technology suitable for automation, and reducing fusing time due to heat generated in resistors on both sides thereof by forming a fusible element with a ring shape.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a composite protection device for blocking current and voltage in an abnormal state. BACKGROUND OF THE INVENTION < RTI ID = 0.0 >

The present invention relates to a composite protection device for blocking current and voltage in an abnormal state, and more particularly, by constituting a resistance element in the form of a structure, it is possible to improve the durability of the resistance element itself and utilize a surface mounting technique advantageous for automation The present invention relates to a composite protective device for blocking a current and voltage in an abnormal state, which can shorten a fusing time due to heat generated in a resistor arranged in parallel on both sides of a fuse element.

A non-return type protection element that detects excessive heat generation caused by an overcurrent of the protected device or is sensitive to abnormal overheating of the ambient temperature is operated at a predetermined operating temperature Shut off the electrical circuit. As one example, there is a protection element that generates a resistance by the signal current detecting an abnormality occurring in the device and operates the fuse element by the heat generation. The protection element includes a protection element using a film resistance provided on a ceramic substrate and a dendrite formed on the electrode surface in the overcharge mode of the lithium ion secondary battery using the protection element, And prevents the battery from being charged to a predetermined voltage or higher at the time of charging.

Korean Patent Laid-Open Publication No. 10-2001-0006916 discloses a low-melting-point metal body having an electrode and a heating element for a low-melting-point metal body formed on a protective element substrate. A low-melting-point metal body is formed directly on the electrode and the heating element. An inner sealing portion made of a solid flux or the like is provided to prevent oxidation, and an outer sealing portion or a cap is provided on the outer side of the inner sealing portion to prevent the melt from flowing out of the device during melting of the low melting point metal body.

13A and 13B are a plan view and a sectional view showing a protection element in which a fusible element (low-melting metal element) is formed on a conventional resistance (heating element), and FIG. 14 is a cross- The photograph of the fusing is taken.

13A and 13B, a conventional protection device includes a ceramic substrate 1 on which a paste-type resistor 2 is applied, and on the resistor 2, an insulator 3, a fuse terminal 4, The fuse terminal 4 and the case 6 are stacked in this order. The connection portion 4a of the fuse terminal 4 is connected to the resistance terminal 8.

When a current is applied to the resistor, heat generated in the resistor passes through the resistor terminal connected to the fuse terminal. That is, the fusible element can not uniformly supply the heat generated by the resistance, and a relatively small amount of heat is applied to a region near the connection portion 4a.

Therefore, as shown in FIG. 14, the fusible element has a problem in that the end face for blowing is not uniform on both sides, and the insulation distance between the region close to the connection portion is very narrow and the stability against insulation is lowered.

In addition, since the conventional protection device is applied in the form of a resistance paste composed of an inorganic binder or an organic binder, the resistance of the heating element itself is low, and a sufficient time-lag characteristic that can be used at a high voltage is not provided .

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a resistive element, And the current and voltage of the capacitor are cut off.

It is also an object of the present invention to provide a composite protection device for blocking current and voltage in an abnormal state capable of shortening the fusing time due to heat generated in a resistor provided in both sides by constituting the fusible element in a ring shape .

It is another object of the present invention to provide a semiconductor device having a plurality of resistors connected in parallel on both sides of a fusible element with a variety of resistance values and sizes, And to provide a composite protection device for blocking current and voltage in an abnormal state capable of designing.

It is also an object of the present invention to provide a resistance element in which a plurality of resistive elements are connected in parallel on both sides of a fusible element in order to shield an electric current and a voltage in an abnormal state capable of sufficiently securing an insulation distance during fusing of the fusible element And to provide a composite protection device.

It is also an object of the present invention to provide a composite protection device for blocking a current and voltage in an abnormal state which prevents a resistance from melting at a reference voltage by separating the resistance element from the fusible element.

To this end, the composite protection device for interrupting the current and voltage in the abnormal state according to the present invention is connected to the first and second terminals formed on the main circuit and fused when an overcurrent is applied to the main circuit, Element; A resistor element having a plurality of resistors connected to the resistor terminals formed on a protection circuit connected to the fusible element; And a switching element connected to the protection circuit for allowing a current to flow to the current terminal when a reference voltage is applied and controlling the current to flow to the resistance terminal when a voltage out of the reference voltage is applied The first and second terminals and the resistance terminal are arranged on the same plane so as to be spaced apart from each other. The fusible element is fused by heat generated in the resistance element when a voltage exceeding the reference voltage is applied.

The resistance element of the composite protection element for interrupting the current and voltage in the abnormal state according to the present invention is composed of first and second resistance elements connected in parallel on both sides of the fusible element, .

The first and second resistance elements of the composite protection element for blocking the current and the voltage in the abnormal state according to the present invention are formed to have the same size or different sizes so as to increase the degree of freedom in designing the protection circuit do.

In addition, the resistance element of the composite protection element which blocks the current and voltage in the abnormal state according to the present invention is composed of first and second resistance elements connected in series on both sides with respect to the fusible element.

In addition, a connection terminal connected to the first and second resistance elements is disposed between the first and second terminals of the composite protection device for interrupting the current and voltage in the abnormal state according to the present invention, And the first and second resistance elements and the fusible element are juxtaposed on the upper surface of the conductive layer.

The resistance element of the composite protection element that blocks the current and voltage in the abnormal state according to the present invention includes a ceramic body made of a ceramic material, a terminal portion formed at both ends of the ceramic body, Layer. ≪ / RTI >

In addition, the resistance element of the composite protection element that blocks the current and voltage in the abnormal state according to the present invention includes a heat insulating cover surrounding the outer surface, wherein the heat insulating cover is opened only in the direction of the fusible element, And the heat is concentrated to the fusible element.

According to the composite protection device that blocks the current and voltage in the abnormal state according to the present invention having the above-described configuration, by constructing the resistance element in the form of a structure, it is possible to improve the durability of the resistance element itself and utilize surface- There is an effect.

Further, according to the composite protection device for blocking the current and voltage in the abnormal state according to the present invention, the fuseable element is formed in a ring shape, so that the effect of shortening the fusing time due to heat generated in the resistors juxtaposed on both sides have.

In addition, according to the composite protection device for interrupting the current and voltage in the abnormal state according to the present invention, a plurality of resistive elements connected in parallel on both sides of the fusible element can be combined in various resistance values and sizes Therefore, the degree of freedom can be increased and the design optimized for the product characteristics can be obtained.

In addition, according to the composite protection device for blocking the current and voltage in the abnormal state according to the present invention, since the resistance element is constituted by a plurality of resistors connected in parallel on both sides with respect to the fusible element, There is an effect that sufficient securing can be achieved.

Further, according to the composite protection device for blocking the current and voltage in the abnormal state according to the present invention, the resistance element is prevented from melting at the reference voltage by separating the resistance element from the fusible element.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram for explaining a use state of a composite protection element for blocking current and voltage in an abnormal state according to the present invention; FIG.
2 is a plan view showing a first embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.
3A and 3B are a perspective view and an exploded perspective view, respectively, showing a first embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.
4A and 4B are perspective views showing a ring-shaped fusible element according to the present invention.
5 is a cross-sectional view showing a resistance element according to the present invention.
6A and 6B are plan views showing a state in which resistive elements according to the present invention are arranged.
7A and 7B are a circuit diagram and a plan view showing a state in which the fusible element is fused when an overcurrent is applied to the main circuit.
8A and 8B are a circuit diagram and a plan view showing a state where the fusible element according to the present invention is fused.
Fig. 9 is a cross-sectional view taken along the line AA of Fig. 3A showing a first embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.
Fig. 10 is a cross-sectional view showing a second embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.
11 is a circuit diagram for explaining the use state of the third embodiment of the composite protection device for blocking the current and voltage in the abnormal state according to the present invention.
12A and 12B are a perspective view and an exploded perspective view, respectively, showing a third embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.
13A and 13B are a plan view and a cross-sectional view showing a protective element in which a fusible element (low-melting metal element) is formed on a conventional resistance (heating element).
FIG. 14 is a photograph of a state where a fusible element is blown when an overvoltage is applied to a conventional protection element.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram for explaining a use state of a composite protection element for blocking current and voltage in an abnormal state according to the present invention; FIG.

Referring to FIG. 1, a composite protection element (hereinafter referred to as a 'complex protection element') for blocking current and voltage in an abnormal state according to the present invention is formed by fusing a fusible element 10 connected on a main circuit And protects elements connected to the main circuit in an abnormal state.

First, the type of the main circuit to which the complex protection device according to the present invention can be applied is not particularly limited, and it can be exemplified that it is a circuit in which the portable secondary battery is charged. Therefore, the following description will focus on the embodiment of the present invention, which is applied to a circuit for charging a secondary battery, which blocks a current and a voltage in an abnormal state of the present invention.

On the main circuit, a fusible element 10, a power source, and a charger are connected to each other.

The protection circuit is configured to be connected in parallel between the power source terminal and the rechargeable battery so as to protect the rechargeable battery when a voltage exceeding the reference voltage is applied. Specifically, the protection circuit may include a plurality of resistance elements 20 and 20a connected in parallel with the fuse element 10, and a switching element 30 connected to the resistance elements 20 and 20a.

The switching element 30 applies a control signal for turning on the transistor 31 when a voltage lower than the reference voltage or a high voltage is applied to the transistor 31, And a control section 33 for controlling the current to flow through the resistance element. However, the present invention is not limited to such a configuration.

FIG. 2 is a plan view showing a first embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention, and FIGS. 3A and 3B are views FIG. 2 is a perspective view and an exploded perspective view showing a first embodiment of a composite protection element. FIG.

2 to 3B, a complex protection device according to the present invention includes a fusible element 10, a resistance element 20, and a switching element 30.

The fusible element 10 according to the present invention is connected to the first and second terminals 50 and 50a formed on the main circuit and is fused when the overcurrent is applied to the main circuit to protect the rechargeable battery.

The fusible element 10 may be made of a low melting point metal or alloy having a melting point of 120 to 220 캜.

The first and second connection terminals 40 and 40a connected to the first and second resistance elements 20 and 20a are positioned between the first and second terminals 50 and 50a. Both ends of the first connection terminal 40 are electrically connected to the resistor terminals 60b and 60d respectively and both ends of the second connection terminal 40a are electrically connected to the resistor terminals 60a and 60c, respectively.

An insulating layer 41 and a conductive layer 42 are sequentially stacked on the upper surface of the connection terminal 40. The first and second resistance elements 20 and 20a and the fusible element (10).

The insulating layer 41 serves to electrically isolate the connection terminal 40 from the conductive layer 42.

The conductive layer 42 not only allows the fusible element 10 and the first and second resistor elements 20 and 20a to be electrically connected to each other but also causes the first and second resistor elements 20 and 20a to be electrically connected to each other. And may be formed in such a manner that silver (Ag) paste or the like is applied to the upper surface of the insulating layer 41.

One end of the conductive layer 42 is connected to the third terminal and the other end of the conductive layer 42 is disconnected from the fourth terminal 55a so that the first resistor element 20 and the second resistor element 20a They are connected in parallel.

The first and second terminals 50 and 50a and the resistor terminals 60 and 60a and 60b are spaced apart from each other on the same plane so that the first and second terminals 50 and 50a, 2 resistive elements 20 and 20a may be arranged on both sides of the fusible element 10 so as to be spaced apart from each other.

When an overvoltage is applied to the main circuit to turn on the switching element 30, a current flowing in the main circuit flows through the fusible element 10, the conductive layer 42, the third terminal 55, And are distributed to the two resistance elements 20 and 20a and are merged at the resistance terminal 60c and flowed to the fourth terminal 55a.

4A and 4B are perspective views showing a ring-shaped fusible element according to the present invention.

4A, the fusible element 10 of the present invention includes a connecting portion 15 connected to the first and second terminals 50 and 50a, an opening portion 17 having a central region opened upward and downward, And can be formed in a rectangular ring shape including a first fused portion 11 and a second fused portion 13 in which the fused ends are formed. Further, as shown in FIG. 4B, the fusible element 10a may have an elliptical ring shape, or may have other shapes.

By configuring the fusible element 10 in a ring shape which is different from the conventional flat fusible element, it is possible to shorten the fusing time by forming the open portion. Further, the fusible element 10 has an advantage that the fusing time can be controlled by increasing or decreasing the size of the opening.

5, the resistance element 20 includes a ceramic body 21 made of a ceramic material and a ceramic body 21 formed at both ends of the ceramic body 21, A resistive layer 22 formed on the upper surface of the ceramic body 21 and a coating layer 24 protecting the resistive layer 22 can be exemplified. However, the present invention is not limited thereto. It is needless to say that various types of resistance elements such as a resistance element in which a coil is wound on the outer circumferential surface of a ceramic body, a resistance element in which a spiral groove is formed, a melf type, and a chip type can be used.

As described above, the composite protection device of the present invention can improve the durability of the resistance element itself by forming the resistance element 20 in the form of a structure, as compared with applying the conventional resistance element to the upper part of the fusible element in paste form. Therefore, it is possible to prevent the resistance element from melting or breaking before the fusible element, so that the rechargeable battery can be stably protected.

In addition, since the resistance element 20 of the present invention is formed in a form of a structure different from the fusible element 10, there is an advantage that the surface mounting technology can be positively utilized.

6A to 6C are plan views showing a state in which resistive elements according to the present invention are arranged.

6A, the resistance element is composed of first and second resistance elements 20 and 20a, two of which are connected in parallel on both sides of the fusible element 10, and the first and second resistance elements 20a and 20a may have the same resistance value 20R and may have different resistance values 20R and 10R as shown in Figs. 6B and 6C.

6B and 6C, when the first and second resistance elements 20 and 20a have different resistance values, the second resistance element 20a is smaller than the first resistance element 20 (See FIG. 6B), and the second resistive element may have a smaller size than the first resistive element (see FIG. 6C).

As described above, the complex protection device according to the present invention can variously combine the resistance values of the plurality of resistance elements, and can variously combine the size / shape of the resistance elements. Various combinations of these resistance elements can increase the degree of freedom in designing the main circuit or the protection circuit, and can form a composite protection device optimized for the product characteristics.

In addition, the multiple protection device according to the present invention includes a plurality of resistive elements in parallel, so that even when the resistive element on one side, for example, the second resistive element in Fig. 6A does not operate properly, 1 and 2 resistance elements are complementary to each other, the stability can be improved.

7A and 7B are a circuit diagram and a plan view showing a state in which the fusible element is fused when an overcurrent is applied to the main circuit.

7A and 7B, the fusible element 10 is fused by heat due to an inrush current when an instantaneous surge current is applied to the main circuit.

At this time, the fusible element 10 is fused in the area of the front end portion 11 and the main circuit is cut off, thereby preventing damage or explosion of the rechargeable battery. The fusible element 10 is fused by heat due to an inrush current when a surge current momentarily flowing into the main circuit is applied.

8A and 8B are a circuit diagram and a plan view showing a state where the fusible element according to the present invention is fused.

Referring to FIGS. 8A and 8B, when a voltage (for example, an overvoltage) deviating from a reference voltage is applied to the main circuit as described above, current is controlled to flow from the switching device to the first and second resistance devices. (See FIG. 1). The fusible element 10 is divided into a first fusing part 11 and a second fusing part 13 by heat generated by a current flowing into the first and second resistance elements 20 and 20a ) Area to protect the rechargeable battery.

As described above, the combined protection device according to the present invention can protect the rechargeable battery in an abnormal state in which an overcurrent is applied or an overvoltage is applied.

Fig. 9 is a cross-sectional view showing a first embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.

Referring to FIG. 9, in the complex protection device according to the present invention, the first and second resistance elements 20 and 20a are juxtaposed on both sides of the fusible element 10, respectively. Therefore, when a voltage that deviates from the reference voltage is applied to the main circuit, the fusible element 10 is electrically connected to the radiation heat radiated from the first and second resistance elements 20 and 20a and the conductive heat conducted through the conductive layer 42 Fused.

Since the first and second resistance elements 20 and 20a are located on both sides of the fusible element 10, it is possible to sufficiently secure the insulation distance during fusing (see FIG. 6C).

The first and second resistance elements 20 and 20a are separated from the fusible element 10 by a predetermined distance. Therefore, even if a current is applied to the first and second resistive elements temporarily in a state where a voltage within a reference voltage is applied to the main circuit, due to a separation distance between the first and second resistive elements and the fusible element, The delay time can be secured.

Fig. 10 is a cross-sectional view showing a second embodiment of a composite protection device for blocking current and voltage in an abnormal state according to the present invention.

Referring to FIG. 10, the composite protection device according to the present invention may include a heat insulating cover 25 on the outer surfaces of the first and second resistance elements 20 and 20a.

The heat insulating cover 25 provides the directionality so that the heat generated in the resistance element 20 can be concentrated in the direction of the fusible element 10.

Therefore, the heat insulating cover 25 surrounds the outer surface of the resistor element 20, and the direction of the fusible element 10 is opened.

By forming the heat insulating cover 25 on the outer surface of the resistor element 20 as described above, it is possible to shorten the fusing time and to prevent the heat from being transmitted to peripheral elements other than the fusible element 10. [

11A and 11B are circuit diagrams for explaining the use state of the composite protection device for blocking the current and voltage in the abnormal state according to the present invention in the third embodiment. Figs. 12A and 12B are diagrams showing the current and voltage in the abnormal state according to the present invention, FIG. 3 is a perspective view and an exploded perspective view showing a third embodiment of a composite protection element for shielding a composite protection element.

11 to 12B, the complex protection device according to the present invention includes first and second resistance elements 20 and 20a, two of which are connected in series on both sides of the fusible element 10, Can be configured.

When the first and second resistance elements 20 and 20a are connected in series and an overvoltage is applied to the main circuit and the switching element 30 is turned on, a current flowing in the main circuit flows through the fusible element 10 The conductive layer 42, the third terminal 55, the first resistance element 20, the connection terminal 40, the second resistance element 20 and the fourth terminal 55a in this order.

As described above, the complex protection device that blocks the current and voltage in the abnormal state according to the present invention can be configured by connecting a plurality of resistance elements in series as well as in parallel.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Accordingly, the scope of the present invention should be construed as being limited to the embodiments described, and it is intended that the scope of the present invention encompasses not only the following claims, but also equivalents thereto.

10: fusible element 11: first fusing part
13: second fusing part 15: connecting part
17: open part 20: resistive element
21: ceramic body 22: resistance layer
23: terminal portion 24: coating layer
25: Insulation cover 30: Switching element
31: transistor 32: diode
33: control unit 40: connection terminal
41: insulating layer 42: conductive layer
50: first terminal 50a: second terminal
55: third terminal 55a: fourth terminal
60: Resistance terminal

Claims (8)

A fusible element which is connected to first and second terminals formed on the main circuit and fired when an overcurrent is applied to the main circuit, the fusible element being in a ring shape;
A resistance element connected to a resistance terminal connected to the fusible element;
And a switching element for controlling the current to flow to the resistor terminal when a voltage exceeding the reference voltage is applied,
The first and second terminals and the resistance terminals are juxtaposed with each other on the same plane,
Wherein the fusible element is fused by heat generated in the resistance element when a voltage that is outside the reference voltage is applied,
A connection terminal connected to the resistance element is disposed between the first and second terminals,
Wherein an insulating layer and a conductive layer are sequentially stacked on an upper surface of the connection terminal, the resistance element and the fusible element are juxtaposed on an upper surface of the conductive layer,
Wherein the fusible element is fused by the radiation heat of the resistance element and the conductive heat through the conductive layer. The method according to claim 1,
Wherein the resistive element comprises first and second resistive elements connected in parallel on both sides of the fusible element with respect to the fusible element and having the same resistance value. The method according to claim 1,
Wherein the resistive element comprises first and second resistive elements connected in parallel on both sides of the fusible element and having different resistance values. The method according to claim 2 or 3,
Wherein the first and second resistance elements are formed to have the same size or different sizes so as to increase the degree of freedom in designing the protection circuit. The method according to claim 1,
Wherein the resistive element comprises first and second resistive elements connected in series on both sides of the fusible element, respectively. delete The method according to claim 1,
Characterized in that the resistance element comprises a ceramic body made of a ceramic material, a terminal part formed at both ends of the ceramic body, and a resistance layer formed on an outer circumferential surface of the ceramic body. Protection device. The method according to claim 1,
Characterized in that the resistance element is provided with a heat insulating cover surrounding the outer surface and the heat insulating cover is opened only in the direction of the fusible element so that the heat generated in the resistance element is concentrated in the fusible element. And a composite protection device for blocking the voltage.

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