TW200421376A - Thermally-actuated switch - Google Patents

Abstract

The present invention provides a thermally-actuated switch for passing current to another channel by breaking electricity to a heating element such as a battery, when an abnormal heat is detected on the heating element. The thermally-actuated switch (2) of the present invention has the following in the housing (3): a first fixed contact (7a); a second fixed contact (8a); a thermally-actuated device (9) such as a bimetal capable of displacing its free end between the first and the second fixed contacts (7a), (8a); and a moveable contact section (10) located at the free end section of the thermally-actuated device (9), which contacts with any one of the first fixed contact (7a) and the second fixed contact (8a). When the temperature is below the predetermined temperature, the moveable contact section (10) contacts with the first fixed contact (7a) in the thermally-actuated device (9). When the temperature exceeds the predetermined temperature, the thermally-actuated device (9) turns over, so that the moveable contact (10) contacts with the second fixed contact (8a).

Description

200421376 发明 Description of the invention: The present invention relates to a thermally actuated switch that separates a movable contact supported by a thermally actuated element such as a bimetal sheet from a fixed contact, and particularly relates to an abnormality in a battery device such as a battery pack. The heat is detected and the thermal trigger of the thermal protector that suppresses the heat is activated. [Prior art] This type of thermally actuated switch has a conventional structure that includes a thermally actuated element such as a bimetal sheet formed by joining a plurality of metal sheets with different thermal expansion coefficients together. The arm is installed in the housing, and the movable contact of the mouth 疋 σ on the free end of the bimetal is opposite to the fixed contact fixed in the housing and can be contacted and separated. At the time of phoenix, the switch of ON (ON) is switched to OFF (OM). (See, for example, Japanese Patent Application Laid-Open No. 2001_76600 (pages 4 to 7, FIG. 3)). =, When the temperature drops below the temperature, use the bimetal to press the movable contact to the solid contact, so keep the switch on. When it exceeds the predetermined level, the bimetal is turned, so the movable contact When the fixed contact is left, the conduction between the two contacts is cut off, and the switch is switched to the switch off state. This: The thermally actuated switch is connected in series with the battery. Therefore, when the battery abnormally generates heat and the bimetal exceeds a predetermined temperature, the power can be quickly cut off to suppress heat generation. Therefore, it has a thermal protector function for battery devices such as battery packs. . Ren, sometimes in the power supply of the device, a battery pack is used to connect many batteries in series, even Tian U, +, and y Cai use the above-mentioned thermally actuated switch as a trap for this type of battery pack. 5 ?, w Α ..., Paul. Only for the detection of a battery abnormality in the thermal trigger switch

O: \ 88 \ 88106.DOC 200421376 In the stage of heating and cutting off the power, the battery pack stops working as a power source. The battery is not hot, and the temperature will not drop immediately. Therefore, at h full As a countermeasure, sometimes it is necessary to turn on a cooling fan, an alarm, etc. It is impossible to output a 7 ^ to an external circuit such as a protection function circuit only by using the above-mentioned conventional thermally actuated switch. Therefore, the thermal protector cannot be improved at a low cost Sexual problems. Spoof [Inventive Content] In view of the actual situation of this prior art, the object of the present invention is to provide a thermally actuated switch. When abnormal heating of a heating element such as a battery is detected, the heating element can be cut off and energized so that current flows in Other lines. In order to achieve the above-mentioned purpose, the present invention has a thermally actuated opening relationship provided with a first fixed contact, a point, and a second fixed contact inside the housing; a thermally actuated element (such as a bimetallic piece) ' The metal plates are joined together, and the free end portion can be between the first and second fixed contact points; and the contact point portion is located at the free end portion of the thermal bow I moving element, and the first! Contact with any of the second fixed contacts; when the temperature is below a predetermined temperature, the thermally actuated element brings the movable contact portion into contact with the fixed contact; when the temperature exceeds a predetermined temperature, the thermally actuated The element is turned over, and the movable contact portion is brought into contact with the second fixed contact. The thermal activation constructed in this way, if the first fixed contact is connected to the battery heating element, and the heating element is energized via the movable contact portion, &

When the body is abnormally heated, the double-membered moon is used. ^ &Quot; I, Kawasaki's metal sheet is used to turn over the heat-driven element, and the movable contact part can be separated from the first fixed contact 疋 2 and fixed to the second. Contact phase ^

O: \ 88 \ 88106.DOC 200421376, so you can not only cut off the ^ that has an abnormality as an automatic switch, it will ... Therefore, it can be connected in series with heating elements such as ... In addition, the k-thickness heating element continues to use 11 p _ electricity, ¾ uses Θ soldiers and other heating elements to use it as the switch for the maid, etc., and sticks ARM to the bamboo shoots — and the knife and knife Report (output) the abnormality of the heat limb and the poor sound, and activate the cooling fan and the alarm. For example, 'the _ end side of the thermally actuated element is used as a free end, and the side is used as a fixed end, and the first and second rafters which are derived from the fish contact phase are provided in the direction of the ^ and outside the shell. (2) The second terminal derived from the conduction of the second fixed contact, and the two common terminals that are in direct contact with the movable contact part when the solid and the hollow are connected. When the temperature is lower than the temperature, the above敎 Inductors make the ^ terminal and the common terminal conductive. # Exceeds the predetermined temperature. The moving element enables the second terminal and the common terminal. — The thermally actuated switch can reliably change with temperature. The contact separation action of the corresponding active hundred-moving contact part and each fixed contact, and the switching of the circuit for switching the lead-thunder circuit, and the structure is very simple. In addition, if the contact member used in the movable contact portion is fixedly disposed at the free end portion of the thermally actuated element, a 1 &2; and there is a portion protruding toward the fixed contact side of the 苐 1 and fixed to the second The protruding parts on the contact side do not need to be provided with movable contacts that are in contact with and separate from each fixed contact, so the effect is good. [Embodiment] With reference to the drawings, a detailed description of an embodiment of the present invention will be given below. 1 is a cross-sectional view showing a normal state of a thermally actuated switch according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a state where a bimetal of the actuated switch is turned over, and FIG. 3

O: \ 88 \ 88106.DOC 200421376

In the battery device shown in FIG. 5, a plurality of batteries are connected in series, and a thermally actuated switch 2 and a conductor 4 & u ~ i3 are mounted on each battery 1. The main components of the thermally actuated switch 2 are: a combination of the lower case 4 and the upper case 5 to form a rectangular synthetic resin case 3; a good conductive metal plate 6, 7, which is integrally formed when the lower case 4 is formed; A good conductive metal plate 8 that is integrally formed when the upper case 5 is formed, and a bimetal sheet (including a three-layer metal sheet sandwiching a good conductive copper plate as an intermediate layer) formed by laminating two metal plates with different thermal expansion coefficients. (Inside) 9 and a highly conductive movable contact member 10 that is riveted and fixed to the free end portion of the bimetal piece 9. The metal plates 6 to 8 are made of, for example, copper or phosphor bronze, and the movable contact member 10 is made of, for example, a copper-nickel alloy or silver tin oxide. A semi-spherical inverting portion 9a is formed at the center of the bimetal 9 to ensure that the inverting operation can be performed. The metal plate 6 has a common contact exposed on the inner bottom surface of the lower case 4, a common terminal 突出 protruding outward from the lower case 4, and an inclination 46c embedded in the lower case 4. Similarly, the metal plate 7 includes a first fixed contact 7a exposed on the inner bottom surface of the lower case 4, a first terminal 7b protruding downward from the outside of the lower case 4, and an inclined portion 7c embedded in the lower case 4. The metal plate 8 includes a second fixed contact 8a exposed on the top surface of the upper case 5, a second terminal 8b protruding outward from the upper case 5, and an inclined portion (not shown) embedded in the upper case 5. The fixed end of the bimetal 9 is fixed to a common contact or more by a method such as spot welding. The free end of the bimetal 9 can be between the first fixed contact 7a and the second fixed contact 8a which are opposite to each other.

O: \ 88 \ 88106.DOC 200421376 Up and down displacement (can be shaken). Moveable contact 1 Fixed contact 7 a Side protruding part 77 a 77 'toward the second fixed contact 〃, as shown in FIG. 3, the fixed contact guides in opposite directions from each other / Brother 1 terminal 7b comes out of case 3 (lower case 4) Baqiu @ + D. Brother 2 terminal 8b goes from case 3 (upper case 5) to the common bitch 6b and the first! The directions in which the cold-out directions of the ends .., s ^ ^ intersect (vertical directions in this embodiment) are derived. The shell 3 guides this in completely different directions—the three terminals 6b, 7b, and 8b come out from the outside σ, which can improve the surface workability when connected to the conductor plates 11 to 13, and can reduce the Mounting area (dedicated area) when the thermally actuated switch 2 is mounted on a hair plate (not shown) such as a battery. In addition, the common terminal that is electrically connected to the fixed end portion of the bimetal piece 9: the second terminal and any one of the first and second terminals (in this embodiment, the first terminal 7b), along the shell 3 direction They extend in opposite directions to each other. Therefore, if they are formed integrally with the case 3 (the lower case sentence) by insert-molding the terminal and the number of terminals, a metal made of the same endless belt shape (h〇〇p) is used. The two terminals 6b, 7b are processed using materials, and the production efficiency is good. In addition, the second terminal 8b is bent as shown in FIG. 3, and the common terminal 6b and the first and second terminals are formed. The lower surface is located on the same plane. In this way, the thermally actuated switch 2 can also be used for surface mounting on a circuit board, etc. The connection relationship between the thermally actuated switch 2 and the conductor plate on each battery 1 is as follows: As shown in Fig. 5, the first terminal 7b is connected to the conductor plate, the common terminal 6b is installed on the conductor plate 12, and the second terminal is connected to the conductor plate 13. Furthermore, the conductor plate 11 is connected to the negative electrode of the battery On the conductor plate 12 is connected with

O: \ 88 \ 88I06 DOC 200421376 This battery 1 is adjacent to the positive electrode of one battery 1 and the other battery 0. The conductor plate 13 is connected to the other conductor plate 12 extending from it. In a normal state (usually unusable) exceeding a predetermined temperature, as shown in FIG. 1, the movable contact member 丨 〇 is overlapped with the fixed contact 7 a. Therefore, the common terminal is connected to the common terminal via the bimetal 9. The second terminal 7b is turned on, so the conductor plates 12, 丨 丨 are closed, and the conductor plates ^, 13 are open. However, when the predetermined temperature is exceeded, the bimetal is flipped as shown in FIG. 2, so the movable contact 10 leaves the i-th fixed contact to overlap the second fixed contact 仏. That is, the common terminal 6b and the first! The conduction of the terminal 7b is cut off, and the public terminal 6b and the second terminal 8b are electrically connected via the bimetal sheet 9. Therefore, the conductor plates 12, 11 are opened and the conductor plates 12, 13 are closed. The thermal trigger switch 2 mounted on each battery 1 operates as described above. Therefore, regarding the battery device of this embodiment, when any battery 丨 abnormally generates heat, the power to the battery 1 is cut off and attached to the battery 丨The upper conductor plate 13 has a function as a bypass line. That is, in FIG. 5, it is assumed that the battery in the center of the illustration is la, the battery to the right of battery la is lb, and the battery to the left of battery u is I. If there is no abnormality in the three batteries la to M, the current flows through the conductive plates 12 and U attached to the negative electrodes of each battery, and flows out from the positive electrode of each battery to the conductive plate 12 of the adjacent battery. Abnormal heating of the core 'The bimetal 9 of the thermally actuated switch 2 installed on the battery 1a is turned over: then, as described above, the movable contact member 10 leaves the first fixed contact and is connected to the second fixed contact 8a, therefore, 'the conductor plate attached to the battery u is open between the " and the conductor plate 12, U is closed' The hatched part shown in Figure 5 becomes O: \ 88 \ 88106.DOC -10- 200421376 _ The “electrical path” flows from the positive electrode of the battery 1 b to the conductor for the battery 1 a to the conductive plate conductor plate 13. Therefore, the negative electrode of the battery la does not flow a current, the current is cut off, and 'the current flows through the conductor plates 12 and 13 for the battery la to the conductor plate 12 for the battery b'. Therefore, the battery lb and the battery lc bypass the battery ^ It becomes short-circuited. Regarding the battery installation of this embodiment, even if any battery 1 generates abnormal heat, it can ensure that the bypass line of the battery i is bypassed, so that the power supply function is not stopped, so it can ensure safety and greatly Improve the convenience of use. In addition, if a conductive plate attached to each battery as a backup circuit is connected to an external circuit such as a protective function circuit, the abnormal heat generation information of the battery can be automatically notified (exported) to the external circuit, so it is easy to improve safety. Measures. Moreover, in this embodiment, the thermally actuated switch 2 uses one end side of the bimetal piece 9 as a free end portion supporting the movable contact member 10. The other end side of the bimetal piece 9 is often connected to the common terminal 6b. The conductive fixed end portion simplifies the structure and reliably performs the contact separation operation of the movable contact member 10 and each of the fixed contacts 7a, 8 & corresponding to the temperature change, and the conductive path is cut off accordingly. . In addition, the 'i-th fixed contact 7a and the second fixed contact ^ are opposed to each other, so that the movable contact member 10 which is riveted and fixed on the free end portion of the bimetal 9 is brought into contact with and separated from each of the fixed contacts 7a, 8a. Therefore, it is not necessary to provide a movable contact member dedicated to separate from the fixed contact 8 & of the bypass line. Therefore, the battery device can be used conveniently, with high safety and low cost.

O: \ 88 \ 88106.DOC -11-200421376: ,,;, and the two fixed contacts 7 a, 8 a are in a positional misalignment & & n are offset by 1 positive and 1 opposite ^ 22: 7 ... Yang Keji's m > Where 'aa corresponds', two movable contact members are provided separately. Further, the common T and the first and second fixed contacts are integrally formed with the metal plates 6 to 8 constituting the common terminals 6b and f1 and the second terminal, respectively. However, the metal plates 6 to 8 may be formed as necessary. The contacts 6a, 7a, and 8a, which are different from each of the terminals 6b, 7b, and 8b and are composed of other members, are fixed on the top. Fig. 6 is a cross-sectional view showing the normal state of the thermally actuated switch of another embodiment. 7 is a cross-sectional view showing the shape of the bimetal sheet of the thermally actuated switch, and the same symbol is marked on the part corresponding to Figure 2. The thermally actuated opening shown in Figs. The convex portion 4a of 4 and the convex portion 5a of the upper shell 5 hold the central portion of the bimetal 9 and the two ends of the bimetal 4 are swayable (displaceable). The two ends are riveted and fixed respectively. At the same time as the movable contact member 10 and the movable contact member ⑴, a highly conductive metal plate 16 that is often in electrical communication with the metal plate 6 is integrally formed in the upper case 5. The common contacts exposed on the top surface of the metal upper case 5 Click on the common terminal 16b and the inclined portion 16c buried in the upper case 5 to connect them. " J is in contact with and separated from the common contact 16a and the common contact 6a, and the common terminal 16b and the common terminal 讣 are connected. Moreover, the bimetal 9 is in a normal state not exceeding a predetermined temperature (common use complaints) Next, as shown in FIG. 6, the movable contact member 10 is overlapped with the first fixed contact 7 a. The movable contact member 15 is overlapped with the common contact or more. Therefore, the common terminal 6 b and No.} The common terminal is conductive. However, when the high temperature exceeds a predetermined temperature, as shown in FIG. 7, the bimetal 9 turns over.

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The temple and temple are always in a conductive state. For this reason, even if the movable contact member 15 is connected to the appoint-public contacts 6a and 16a, it is equivalent in electricity. Therefore, the movable contact member 10 is separated from the first Since the fixed contact is in contact with the second fixed contact 8a ', the switching operation can be performed in the same manner as in the above embodiment. Effects of the Invention The present invention can be implemented by knowing the above-described manner, and the following effects can be obtained. This type: When the heating element such as a battery abnormally generates heat, the movable contact part can be separated from the first fixed contact by the inversion of a thermally driven element such as a double or a metal sheet, so that it can contact the second fixed contact. , It can not only cut off the power to the heating element that has an abnormality, but also make the bypass circuit and the outer circuit bypassing the heating element. Therefore, the thermal trigger switch can be installed in a battery or other device connected to the body, and the material is automatically switched. It bypasses the abnormally hot heating body and continues to energize other heating bodies, or it can be used as a safety switch to protect The function circuit reports (outputs) the abnormal heating information of the heating element, and causes the cooling fan and the alarm to operate. ... [Brief description of the drawings] Fig. 1 is a cross-sectional view showing a normal state of a thermally actuated switch according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state after the bimetal sheet shown in FIG. 1 is inverted. Fig. 3 is an external view of the thermally actuated switch shown in Figs. 1 and 2. FIG. 4 is a flat view of the upper case of the thermally actuated switch shown in FIG.

O: \ 88 \ 88106.DOC • 13-Face ij.

The main part illustrates the figure. Fig. 6 is a cross-sectional view showing another state of the battery device after the switch is installed. The normal of the thermally actuated switch of an embodiment = 7 is a cross-sectional view showing the state of the bimetal sheet shown in FIG. 6 after the flip is shown. 1 (la, 1b, lc) Battery 2 Thermally actuated switch 3 Inner case 4 Lower case 5 Upper case 6 to 8, 16 Metal plates 6a, 16a Common contacts 6b, 16b Common terminals 7a First fixed contact 7b First terminal 8a Second fixed contact 8b Second terminal 9 Bimetal (hot Bow 丨 moving element) 10, 15 movable contact member 11 to 13 conductor plate O: \ 88 \ 88106.DOC -14-

Claims (1)

200421376 Scope of patent application: contact; second fixed contact; thermally actuated element, which is formed by joining multiple metal plates with the same thermal expansion coefficients, and the free end can be fixed at the above [and 2nd fixed Displacement between the contacts; and the movable contact portion, which is located at the free end of the sacral arch | moving element, is in contact with any of the i-th and second fixed contacts; $ • when the temperature is below a predetermined temperature ' In the thermally actuated element, the movable contact portion is in contact with the first fixed contact, and when the predetermined temperature exceeds a predetermined degree, the thermally actuated element is inverted, and the movable contact portion is fixedly connected to the second Point-to-point contact. 2. If the thermally actuated switch of item 1 of the patent application scope, wherein the end of the thermally actuated element is used as a free end, and the other end is used as a fixed end, and the outer part of the shell is provided with a fixed connection to the first The first terminal derived from the point-to-phase conduction, the second terminal derived from the 211th fixed contact, and the common terminal from which the fixed end portion is often connected to the movable contact portion. When the temperature is lower than a predetermined temperature, the first terminal and the common terminal are electrically connected via the thermally actuated element. When the predetermined temperature is exceeded, the second terminal and the common terminal are electrically connected via the thermally actuated element. 3. If the thermally actuated switch of the scope of patent application ^ or 2, the contact member for the movable contact # is fixedly provided at the free T portion of the thermally actuated element, and has a portion protruding toward the fixed contact side, And the part protruding toward the ㈣th fixed contact side. O: \ 88 \ 88106 DOC