JP2011023556A - Battery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery unit principally used for various electronic appliances which can be easily produced at a low cost and can perform sure electric connection and disconnection. <P>SOLUTION: By providing a framed wall 8 on the outer periphery of the upper surface of a land 2B to which a terminal 4A of a thermal fuse 4 is soldered and by solder-connecting the terminal 4A to the land 2B inside the framed wall 8, the generation of solder balls by an outflow of solder 5 from the upper surface of the land 2B can be prevented when solder-connecting the terminal 4A of the thermal fuse 4 to the land 2B. Thereby, the work required for removing these solder balls can be spared, the production can be performed at a low cost and easily, and the battery unit can be obtained which is capable of performing sure electric connection and disconnection by preventing the short circuit and the like between the terminals 3A of a switching element 3. <P>COPYRIGHT: (C)2011,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 electronic cameras, are equipped with rechargeable batteries and various operations have been performed using this battery power source when being carried. Also, there is a demand for a battery unit that can be electrically connected and separated at low cost.

  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, reference numeral 1 denotes a wiring board on which a plurality of lands 2 are formed on the upper and lower surfaces and a wiring pattern (not shown) for connecting them, 3 is an FET, In a switching element such as a transistor, a terminal 3A of the switching element 3 is mounted and connected to a plurality of lands 2A on the upper surface of the wiring board 1 by soldering.

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

  When manufacturing such a battery unit, first, as shown in the perspective views of FIG. 8A and FIG. 8B, cream-like solder 5 is formed on the upper surfaces of a plurality of lands 2A on the upper surface of the wiring board 1. Is printed, the terminal 3A of the switching element 3 is placed on the land 2A and heated, and the switching element 3 is soldered to the wiring board 1 as shown in the perspective view of FIG.

  9B, the tip of the terminal 4A of the thermal fuse 4 is placed on the land 2B, the thermal fuse 4 is placed in the vicinity of the switching element 3, and between the switching element 3 and the thermal fuse 4. Thermally conductive resin 6 is applied to

  Further, after that, the solder 5 is melted and applied to the lands 2B by a soldering iron (not shown), the terminals 4A of the thermal fuse 4 are soldered to the lands 2B, and the heat conductive resin 6 is dried. 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 an electronic camera, and the switching element 3 is connected to a wiring pattern, a connector (not shown), etc. via a thermal fuse 4. 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 via the switching element 3 to perform various operations of the device, and when charging the battery, the switching element 3 is used. The battery is charged from a charger or the like through the switching element 3.

  In addition, when an overcurrent flows through the switching element 3 due to a short circuit or the like when operating such a device or charging a battery, the switching element 3 generates heat due to the overcurrent. The heat is transferred to the heat conductive resin 6 and further transferred to the thermal fuse 4 through the heat conductive resin 6.

  When the overcurrent flows to a certain extent and the heat transmitted to the temperature fuse 4 reaches a predetermined temperature or more, the temperature fuse 4 is melted and the power supply from the battery to the switching element 3 and the electronic circuit is cut off. It has become so.

  That is, the thermal fuse 4 connected between the battery and the switching element 3 detects heat generation of the switching element 3 due to overcurrent or the like, and when this heat exceeds a predetermined temperature, the power supply from the battery is not supplied. 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 2009-32606 A

  However, in the conventional battery unit, as shown in the partial cross-sectional view of FIG. 10, when soldering the terminal 4A of the thermal fuse 4 to the land 2B, the solder 5 that has flowed outward from the upper surface of the land 2B May be generated on the upper surface of the wiring board 1 as a spherical solder ball 5A. In order to prevent a problem such as a short circuit between the terminals 3A of the switching element 3 due to the solder ball 5A, brushing or washing is performed separately. Therefore, it is necessary to remove the solder ball 5A, and there is a problem that it takes time and effort to manufacture.

  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, is inexpensive, and can be securely connected and disconnected.

  In order to achieve the above object, the present invention provides a battery unit in which a frame wall portion is provided on the outer periphery of a land upper surface to which a terminal of a thermal fuse is soldered, and the terminal of the thermal fuse is solder-connected to the land inside the frame wall portion. When soldering the terminal of the thermal fuse to the land, the frame wall on the outer periphery of the land upper surface prevents the solder from flowing out of the land upper surface to generate solder balls and the like. Therefore, there is no need to remove this separately, a battery unit that can be manufactured inexpensively and easily, prevents short circuit between the terminals of the switching element, etc., and enables reliable electrical connection / disconnection. It has the effect | action that it can obtain.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a battery unit that can be easily manufactured, is inexpensive, and can be securely connected and disconnected.

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

  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)
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, 1 is a wiring board such as paper phenol or epoxy containing glass, 3 is a switching element such as FET or transistor, A plurality of substantially rectangular lands 2 and a wiring pattern (not shown) connecting them are formed on the upper and lower surfaces of the wiring board 1 by copper or the like, and switching is performed on the plurality of lands 2A on the upper surface of the wiring board 1. The terminal 3A of the element 3 is mounted and connected by soldering.

  Reference numeral 4 denotes a temperature fuse having a substantially cylindrical shape in which a fusible metal is built in a cylinder such as ceramic, and 8 is a substantially U-shaped frame wall portion formed on the outer periphery of the land 2B by soldering. The tips of the left and right terminals 4 </ b> A are soldered to the upper surface of the land 2 </ b> B inside the frame wall 8 by solder 5 and placed on the upper surface of the wiring board 1 near the switching element 3.

  Furthermore, 6 is a heat conductive resin such as silicone, and this heat conductive resin 6 is applied between the outer periphery of the switching element 3 and the thermal fuse 4 to constitute a battery unit.

  When manufacturing such a battery unit, first, as shown in the perspective views of FIGS. 3A and 3B, for example, using a metal mask having a thickness of 150 μm, the upper surface of the wiring board 1 is formed. After the cream-like solder 5 is printed in a substantially U shape on the entire upper surface of the plurality of lands 2A and the outer periphery of the upper surface of the land 2B, the terminal 3A of the switching element 3 is placed on the land 2A.

  Next, the wiring board 1 is preheated in a heating furnace at a temperature of about 150 to 180 degrees, for example, for about 60 to 120 seconds, and then heated at a temperature of 250 degrees for 10 seconds, so that the solder 5 on the upper surface of the land 2A is formed. The switching element 3 is soldered to the wiring board 1 as shown in the perspective view of FIG.

  At this time, the solder 5 applied to the outer periphery of the upper surface of the land 2B is heated together with the solder 5 on the upper surface of the land 2A, and the flux and the organic solvent in the solder 5 are evaporated, so that the height changes from about 150 μm to about 90 μm. Thus, a substantially U-shaped frame wall portion 8 is formed on the outer periphery of the upper surface of the land 2B.

  Then, as shown in FIG. 4B, the end of the terminal 4A of the thermal fuse 4 is placed on the land 2B inside the frame wall portion 8, and the thermal fuse 4 is placed in the vicinity of the switching element 3 for switching. A thermally conductive resin 6 is applied between the element 3 and the thermal fuse 4.

  Further, as shown in the partial cross-sectional view of FIG. 5, thereafter, the solder 5 is melt applied to the inside of the frame wall portion 8 on the upper surface of the land 2B for 3 seconds by a soldering iron (not shown) heated to about 320 degrees. Then, the terminal 4A of the thermal fuse 4 is solder-connected to the land 2B, and the heat conductive resin 6 is dried to complete the battery unit as shown in FIG. 1 or FIG.

  When the terminal 4A of the thermal fuse 4 is soldered to the land 2B in this way, a substantially U-shaped frame wall portion 8 is formed on the outer periphery of the upper surface of the land 2B. The molten solder 5 is prevented from flowing outward from the upper surface of the land 2B, and spherical solder balls or the like are not generated on the upper surface of the wiring board 1 in the vicinity.

  That is, by providing the frame portion 8 on the outer periphery of the top surface of the land 2B to which the terminal 4A of the thermal fuse 4 is soldered and soldering the terminal 4A to the land 2B inside the frame wall portion 8, solder balls or the like are generated. Therefore, brushing and cleaning are not required to prevent problems such as a short circuit between the terminals 3A of the switching element 3 due to this, and it can be manufactured easily at low cost.

  Further, the frame wall portion 8 formed from the solder 5 is already heated when the switching element 3 is soldered to the wiring board 1 as described above, and the internal flux and the like evaporate, so-called wettability. Therefore, even when a little heat is applied by the soldering iron as described above, the predetermined height is maintained and the solder 5 It is designed to prevent outflow to the outside.

  The battery unit thus configured is housed and mounted in an electronic device such as a mobile phone or an electronic camera, and the switching element 3 is connected to a wiring pattern, a connector (not shown), etc. via a thermal fuse 4. 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 via the switching element 3 to perform various operations of the device, and when charging the battery, the switching element 3 is used. The battery is charged from a charger or the like through the switching element 3.

  In addition, when an overcurrent flows through the switching element 3 due to a short circuit or the like when operating such a device or charging a battery, the switching element 3 generates heat due to the overcurrent. The heat is transferred to the heat conductive resin 6 and further transferred to the thermal fuse 4 through the heat conductive resin 6.

  When the overcurrent flows to some extent, for example, an overcurrent of 5 A or more flows, and the heat transmitted to the temperature fuse 4 reaches a predetermined temperature or more, for example, 135 ° C. or more, the temperature fuse 4 is blown and The power supply to the switching element 3 and the electronic circuit is cut off.

  That is, the thermal fuse 4 connected between the battery and the switching element 3 detects heat generation of the switching element 3 due to overcurrent or the like, and when this heat exceeds a predetermined temperature, the power supply from the battery is not supplied. By blocking, it is configured to prevent damage to the device due to a short circuit or the like.

  Then, as described above, the frame wall portion 8 is provided on the outer periphery of the upper surface of the land 2B to which the terminal 4A of the thermal fuse 4 is soldered, and the terminal 4A is soldered to the land 2B inside the frame wall portion 8, Since it is possible to prevent the generation of solder balls and the like, there is no need to separately remove the solder balls, which can be easily manufactured at low cost, and a short circuit between the terminals 3A of the switching element 3 due to adhesion of the solder balls or the like can be prevented. It is possible to prevent and ensure electrical contact and separation.

  In the above description, the configuration in which the frame wall portion 8 is provided on the outer periphery of the upper surface of the land 2B has been described. However, as shown in the partial perspective view of FIG. Even when the substantially U-shaped frame wall portion 8 is formed, the present invention can be implemented and the same effect can be obtained.

  As described above, according to the present embodiment, the frame wall portion 8 is provided on the outer periphery of the upper surface of the land 2B to which the terminal 4A of the thermal fuse 4 is soldered, and the terminal 4A is soldered to the land 2B inside the frame wall portion 8. By connecting, when soldering the terminal 4A of the thermal fuse 4 to the land 2B, it is possible to prevent the solder 5 from flowing out from the upper surface of the land 2B to generate solder balls and the like. It is possible to obtain a battery unit that can be easily manufactured at low cost and that can be easily manufactured at low cost and that can prevent a short circuit between the terminals 3A of the switching element 3 and that can perform reliable electrical connection / disconnection. Is.

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

DESCRIPTION OF SYMBOLS 1 Wiring board 2, 2A, 2B Land 3 Switching element 3A Terminal 4 Thermal fuse 4A Terminal 5 Solder 6 Thermal conductive resin 8 Frame wall part

Claims (1)

The wiring board having a plurality of lands and wiring patterns formed on the upper surface, a switching element for switching the battery power supply, and a thermal fuse mounted in the vicinity of the switching element, and the terminals of the thermal fuse are soldered A battery unit in which a frame wall portion is provided on the outer periphery of the land upper surface, and the terminal of the thermal fuse is solder-connected to the land inside the frame wall portion.

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