JP2010165617A - Battery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery unit easy to manufacture and capable of reliably protecting an electronic circuit, concerning one mainly used for various electronic equipment. <P>SOLUTION: By providing a substantially frame-shaped insulating part 15 on the top surface of a land 14 where each terminal 3A of a thermal fuse 3 is soldered, surplus solder 6B in a flux 7 is solidified on the top surface of the land 14 outside the insulating part 15 as the terminal 3A of the thermal fuse 3 is soldered to the land 14, so that soldering balls or the like are prevented from occurring, and time and labor for separate cleaning or the like can be saved to facilitate manufacturing, and at the same time, short circuiting or the like between electrodes of a switching element 2 can be prevented, and thus, a battery unit capable of sure protection of an electronic circuit can be obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery unit mainly used in various electronic devices.

  In recent years, various electronic devices, particularly mobile devices such as mobile phones and video cameras, are equipped with a rechargeable battery, and various operations have been performed using this battery power source when being carried. There is also a need for an inexpensive battery unit that can reliably protect an electronic circuit.

  Such a conventional battery unit will be described with reference to FIGS.

  FIG. 7 is a perspective view of a conventional battery unit. In FIG. 7, 1 is a wiring board having a plurality of wiring patterns (not shown) and lands formed on the upper and lower surfaces, and 2 is a switching element such as an FET or a transistor. The switching element 2 is mounted and connected to a plurality of lands (not shown) on the upper surface of the wiring board 1 by soldering.

  Reference numeral 3 denotes a thermal fuse. The tips of the left and right terminals 3A are soldered to a substantially rectangular land 4 by solder 6 and placed on the upper surface of the wiring board 1 in the vicinity of the switching element 2, and the outer periphery of the switching element 2 Between the thermal fuse 3 and the thermal fuse 3, a heat conductive resin 5 such as silicone is applied to form a battery unit.

  When manufacturing such a battery unit, first, after solder cream is printed on the upper surfaces of a plurality of lands on the upper surface of the wiring board 1, the electrodes of the switching elements 2 are placed on the lands and heated, and then the wiring board 1 is heated. The switching element 2 is soldered.

  Then, as shown in the perspective view of FIG. 8, the tip of the terminal 3A of the thermal fuse 3 is placed on the substantially rectangular land 4, the thermal fuse 3 is placed in the vicinity of the switching element 2, and the switching element 2 and the thermal fuse are placed. 3 is coated with the heat conductive resin 5.

  Further, as shown in the partial cross-sectional view of FIG. 9, the solder 6 is melted and applied to the lands 4 with a soldering iron, the terminals 3A of the thermal fuse 3 are soldered to the lands 4, and the heat conductive resin 5 is applied. After drying, the flux 7 contained in the solder 6 and adhering to the upper surface of the wiring board 1 is removed with a brush or the like to complete the battery unit as shown in FIG.

  The battery unit thus configured is housed and mounted in an electronic device such as a mobile phone or a video camera, and the switching element 2 is connected to a wiring pattern, a connector (not shown), etc. via a thermal fuse 3. Are connected to a battery (not shown) or an electronic circuit (not shown) of the device.

  In the above configuration, when the device is carried, power is supplied from the battery to the electronic circuit through the switching element 2 to perform various operations of the device, and when the battery is charged, the switching element 2 is used. The battery is charged from a charger or the like through the switching element 2.

  Note that, when an overcurrent flows through the switching element 2 due to a short circuit or the like when operating such a device or charging a battery, the switching element 2 generates heat due to this overcurrent. The heat is transferred to the heat conductive resin 5 and further transferred to the thermal fuse 3 through the heat conductive resin 5.

  When the overcurrent flows to some extent and the heat transmitted to the thermal fuse 3 reaches a predetermined temperature or more, the thermal fuse 3 is melted and the power supply from the battery to the switching element 2 and the electronic circuit is cut off. It has become so.

  That is, the thermal fuse 3 connected between the battery and the switching element 2 detects the heat generation of the switching element 2 due to overcurrent or the like, and when this heat exceeds a predetermined temperature, the power supply from the battery is turned off. By blocking, it is configured to prevent damage to the device due to a short circuit or the like.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2008-311163 A

  However, in the conventional battery unit, when soldering the terminal 3A of the thermal fuse 3 to the land 4 as shown in FIG. 9, excessive solder 6 is deposited as spherical solder balls 6A inside and outside the flux 7, Thereafter, when the flux 7 is removed with a brush or the like, the solder balls 6A may adhere between the electrodes of the switching element 2 to cause a short circuit or the like. There was a problem that it took time and effort to produce.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a battery unit that can be easily manufactured and can reliably protect an electronic circuit.

  In order to achieve the above object, according to the present invention, a battery unit is configured by providing a substantially frame-shaped insulating portion on the top surface of a land to which a terminal of a thermal fuse is soldered. The terminal of the thermal fuse is soldered to the land. When soldering, excess solder in the flux can be solidified on the top surface of the land outside the insulating part, preventing solder balls and the like from being generated. At the same time, it is possible to obtain a battery unit that can prevent a short circuit between the electrodes of the switching element and can reliably protect the electronic circuit.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that a battery unit that can be easily manufactured and can reliably protect an electronic circuit can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of background art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a cross-sectional view of a battery unit according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, in which 1 is a wiring board such as paper phenol or glass-filled epoxy, 2 is an FET or transistor, etc. In the switching element, a plurality of wiring patterns (not shown) and lands are formed on the upper and lower surfaces of the wiring board 1 with copper or the like, and the switching elements 2 are formed on the plurality of lands (not shown) on the upper surface of the wiring board 1. Are mounted and connected by soldering.

  Reference numeral 3 denotes a thermal fuse having a substantially cylindrical shape and a fusible metal incorporated in a cylinder such as ceramic. The tip of the left and right terminals 3A has a substantially rectangular shape on the top surface of the land 14 and is substantially frame-shaped and insulated with epoxy, polyester, or the like. The inside of the part 15 is soldered by the solder 6 and placed on the upper surface of the wiring board 1 in the vicinity of the switching element 2.

  Further, 5 is a heat conductive resin such as silicone, and this heat conductive resin 5 is applied between the outer periphery of the switching element 2 and the thermal fuse 3 to constitute a battery unit.

  When manufacturing such a battery unit, first, cream solder is printed on the land upper surface of the wiring board 1, and then the electrode of the switching element 2 is placed on the land and heated to switch to the wiring board 1. The element 2 is soldered.

  Then, as shown in the perspective view of FIG. 3, the tip of the terminal 3A of the thermal fuse 3 is placed inside the insulating portion 15 on the substantially rectangular land 14, and the thermal fuse 3 is placed in the vicinity of the switching element 2, A thermally conductive resin 5 is applied between the switching element 2 and the thermal fuse 3.

  Further, as shown in the partial cross-sectional view of FIG. 4, thereafter, the solder 6 is melted and applied to the inside of the insulating portion 15 on the upper surface of the land 14 by a soldering iron, and the terminal 3A of the thermal fuse 3 is soldered to the land 14. After the heat conductive resin 5 is dried, the flux 7 contained in the solder 6 and attached to the upper surface of the wiring board 1 is removed with a brush or the like, and the battery unit as shown in FIGS. 1 and 2 is completed.

  When the terminal 3A of the thermal fuse 3 is soldered to the land 14 in this way, the land 14 is heated both inside and outside by the soldering iron, so that the terminal 3A is an insulating portion having a substantially frame shape. The solder 6 is securely fixed to the upper surface of the inner land 14 by the solder 6, and the excess solder 6 B in the flux 7 is solidified on the upper surface of the land 14 outside the insulating portion 15, and the spherical solder is formed inside and outside the flux 7. Balls do not precipitate.

  That is, after that, even when the flux 7 adhering to the upper surface of the wiring board 1 is removed with a brush or the like, the excess solder 6B remains fixed to the upper surface of the land 14 outside the insulating portion 15. Since there is no short circuit or the like due to adhesion between the two electrodes and the like, there is no need to perform separate cleaning or the like, and the device can be easily manufactured in a short time.

  The battery unit thus configured is housed and mounted in an electronic device such as a mobile phone or a video camera, and the switching element 2 is connected to a wiring pattern, a connector (not shown), etc. via a thermal fuse 3. Are connected to a battery (not shown) or an electronic circuit (not shown) of the device.

  In the above configuration, when the device is carried, power is supplied from the battery to the electronic circuit through the switching element 2 to perform various operations of the device, and when the battery is charged, the switching element 2 is used. The battery is charged from a charger or the like through the switching element 2.

  In addition, when an overcurrent flows through the switching element 2 due to a short circuit or the like when operating such a device or charging a battery, the switching element 2 generates heat due to this overcurrent. The heat is transferred to the heat conductive resin 5 and further transferred to the thermal fuse 3 through the heat conductive resin 5.

  If the overcurrent flows to a certain extent, for example, 5 A or more, and the heat transmitted to the temperature fuse 3 reaches a predetermined temperature or more, for example, 135 ° C. or more, the temperature fuse 3 is blown, The power supply to the switching element 2 and the electronic circuit is cut off.

  That is, the thermal fuse 3 connected between the battery and the switching element 2 detects the heat generation of the switching element 2 due to overcurrent or the like, and when this heat exceeds a predetermined temperature, the power supply from the battery is turned off. By blocking, it is configured to prevent damage to the device due to a short circuit or the like.

  At this time, as described above, a substantially frame-like insulating portion 15 is formed on the upper surface of the substantially rectangular land 14 to which the terminal 3A of the thermal fuse 3 is soldered, and the excess solder 6B in the flux 7 is formed. Is solidified on the upper surface of the land 14 outside the insulating portion 15 so that solder balls and the like are not generated, so that a short circuit between the electrodes of the switching element 2 can be prevented and the electronic circuit can be reliably protected. ing.

  In the above description, the configuration in which the substantially frame-shaped insulating portion 15 is provided on the upper surface of the substantially rectangular land 14 has been described, but as shown in the partial perspective view of FIG. 5 and the partial cross-sectional view of FIG. A substantially rectangular land 16 is provided with a substantially frame-shaped cutout portion 16A, and a central portion 16C and an outer peripheral portion 16D are connected by a crosspiece 16B, and a substantially frame-shaped insulating portion 15 is formed in the cutout portion 16A. However, the present invention can be carried out and the same effects can be obtained.

  That is, in this figure, when the terminal 3A of the thermal fuse 3 is soldered to the land 16, both the central portion 16C and the outer peripheral portion 16D connected by the rail portion 16B are heated by the soldering iron, and the excess solder 6B in the flux 7 is heated. Is solidified on the upper surface of the outer peripheral portion 16D outside the insulating portion 15, so that spherical solder balls or the like do not precipitate inside or outside the flux 7.

  Thus, according to the present embodiment, the substantially frame-shaped insulating portion 15 is provided on the top surface of the lands 14 and 16 to which the terminals 3A of the thermal fuse 3 are soldered, whereby the terminals 3A of the thermal fuse 3 are connected to the lands 14. When soldering to solder 16 or 16, excess solder 6B in the flux 7 can be solidified on the upper surface of the lands 14 and 16 outside the insulating portion 15 to prevent the formation of solder balls and the like. Thus, it is possible to obtain a battery unit that can be easily manufactured and that can prevent a short circuit between the electrodes of the switching element 2 and can reliably protect an electronic circuit.

  In the above description, the configuration in which the substantially frame-shaped insulating portions 15 are provided on the upper surfaces of the substantially rectangular lands 14 and 16 has been described. However, the polygonal shape, the circular shape, the elliptical land upper surface, The present invention can be implemented even when the substantially ring-shaped insulating portion is formed in a substantially frame shape.

  The battery unit according to the present invention can be easily manufactured and can reliably protect an electronic circuit, and is useful as a battery unit for various electronic devices.

Sectional drawing of the battery unit by one embodiment of this invention Same perspective view Same perspective view Partial sectional view of the same Partial perspective view according to another embodiment Partial sectional view of the same A perspective view of a conventional battery unit Same perspective view Partial sectional view of the same

DESCRIPTION OF SYMBOLS 1 Wiring board 2 Switching element 3 Thermal fuse 3A terminal 5 Thermal conductive resin 6, 6B Solder 7 Flux 14, 16 Land 15 Insulation part 16A Notch part 16B Crosspiece part 16C Center part 16D Outer peripheral part

Claims (1)

A land board having a plurality of wiring patterns and lands formed on the upper surface, a switching element for switching the battery power source, and a thermal fuse mounted in the vicinity of the switching element, and a land to which the terminal of the thermal fuse is soldered A battery unit having an approximately frame-shaped insulating portion on the upper surface.

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