Breaker, and safety circuit and secondary battery pack equipped with same
A circuit breaker and moving piece technology, applied in battery pack components, batteries, circuits, etc., can solve problems such as the thickness obstacle of the resin shell and the thinning of the circuit breaker.
Active Publication Date: 2014-08-20
KOMATSULITE MFG
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- Description
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- Application Information
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Problems solved by technology
[0006] In the circuit breaker of the embodiment disclosed in Patent Document 1, in the region including the base end portion of the movable piece (fixed portion 33 in this patent document) and the small protrusion (reference number 38 in this patent document) in the vicinity thereof , the thickness of the resin case becomes an obstacle, and it becomes a factor that hinders the further thinning of the circuit breaker.
Method used
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Embodiment Construction
[0019] A circuit breaker according to one embodiment of the present invention will be described with reference to the drawings. Figure 1 to Figure 3 Represents the structure of a circuit breaker. The circuit breaker 1 is composed of a fixed piece 2 with a fixed contact 21, a movable piece 4 with a movable contact 3 at the front end, a thermal strain element 5 that deforms with temperature changes, and a PTC (Positive Temperature Coefficient) thermal sensor. The resistor 6 and the resin case 7 for accommodating the fixed piece 2 , the movable piece 4 , the thermal strain element 5 and the PTC thermistor 6 are formed. The resin case 7 is composed of a resin base (first case) 71 , a covering member (second case) 72 attached to the upper surface of the resin base 71 , and the like. Additionally, in this application, the Figure 1 to Figure 3 The upper direction in , that is, the direction in which the PTC thermistor 6 , the thermal strain element 5 , and the movable piece 4 are...
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A breaker is provided with: a movable piece (4) that has an elastically deformable elastic portion (43) and a movable contact on the tip of the elastic portion (43) and that presses the movable contact into contact with a fixed contact; a thermally actuated element (5) that is formed into a shape with a convex surface and is deformed by a change in temperature, thereby actuating the movable piece (4) so that the movable contact separates from the fixed contact; and a resin case (7) which houses the movable piece (4) and the thermally actuated element (5). The bottom surface of the base end (42a) of the movable piece (4) is positioned lower than the top (5a) of the upper surface of the thermally actuated element (5) by a distance (D). Thereby, a stable temperature adjustability and a resistance value are ensured in a breaker used as a protective device for a secondary battery and so forth, while the reduction in size of the breaker is achieved.
Description
technical field [0001] The present invention relates to a small circuit breaker built in a secondary battery or the like of an electric device. Background technique [0002] Conventionally, circuit breakers have been used as protection devices for secondary batteries and motors of various electrical equipment (see Figure 8 as well as Figure 9 ). The circuit breaker is used to protect the secondary battery, motor, etc. when an abnormality occurs, such as when the temperature of the secondary battery during charging and discharging is excessively raised, or when an overcurrent flows to a motor, etc. equipped with automobiles, home appliances, etc. cut off the current. A circuit breaker used as such a protection device needs to operate correctly with changes in temperature and to have a stable resistance value at the time of energization in order to ensure the safety of the equipment. [0003] In addition, when the circuit breaker is used as a protection device for a secon...
Claims
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IPC IPC(8): H01H37/54H01H37/04
CPCH01H37/04H01M2/348H01H37/52H01M2200/101H01H37/54Y02E60/10H01H37/5427H01H61/01H01H61/04H01M50/581
Inventor 浪川胜史
Owner KOMATSULITE MFG