JP2010182915A - Battery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery unit used for various electronic equipment, the battery unit being inexpensive and also securely and electrically connected and disconnected. <P>SOLUTION: A switching element 12 which switches a battery power source is formed in the form of a chip size package, the switching element 12 and a control element 5 are arranged on a wiring substrate 11 in parallel, and those are covered with an insulating coating 9 to obtain the battery unit which can be fabricated at a low cost without increasing operation processes, and is inexpensive and also securely and electrically connected and disconnected since short-circuiting etc., can be prevented even when slight liquid or dust sticks. <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. 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. 5 is a perspective view of a conventional battery unit. In FIG. 5, reference numeral 1 denotes a wiring board in which a plurality of wiring patterns (not shown) are formed on the upper and lower surfaces, and 2 denotes a switching element such as an FET or a transistor. A plurality of terminals 4 of the switching element 2 are mounted and connected to a plurality of lands 3 on the upper surface of the substrate 1 by soldering.

  A control element 5 such as an IC is disposed at a position slightly away from the switching element 2 and a plurality of terminals 6 are mounted and connected to a plurality of lands 7 on the upper surface of the wiring board 1 by soldering. And connected to the switching element 2 via a wiring pattern.

  Reference numeral 8 denotes an electronic component such as a fixed resistor or a capacitor. The plurality of electronic components 8 are mounted and connected to a plurality of lands on the upper surface of the wiring board 1 and connected to the switching element 2 and the control element 5 through the wiring pattern. Has been.

  Furthermore, 9 is an insulating film such as epoxy or polyester, and the switching element 2 and the control element 5 as described above are generally used in a resin mold package in which a semiconductor chip is covered with an insulating resin such as epoxy. In particular, the control element 5 has a narrow interval between the plurality of terminals 6, and an insulating coating 9 is formed on the outer periphery of the control element 5 to cover the control element 5 and the terminal 6 in order to prevent a short circuit due to adhesion of water drops or the like.

  Reference numeral 10 denotes a rectangular surface electrode in which a copper foil or the like is plated with gold, and the switching element 2 and the control element 5 are connected to the plurality of electrodes 10 through a wiring pattern to constitute a battery unit. ing.

  When manufacturing such a battery unit, first, as shown in the exploded perspective view of FIG. 6, after cream solder (not shown) is printed on the upper surfaces of the lands 3 and 7 on the upper surface of the wiring substrate 1. The terminal 4 of the switching element 2 is mounted on the land 3, the terminal 6 of the control element 5 is mounted on the land 7, and the terminals of a plurality of electronic components 8 are mounted on the other lands.

  Furthermore, after this, as shown in the perspective view of FIG. 7, the switching element 2, the control element 5, and the plurality of electronic components 8 are soldered to the upper surface of the wiring substrate 1, and then the liquid is applied to the outer periphery of the control element 5. 5 is applied and dried to complete a battery unit as shown in FIG.

  The battery unit configured as described above is housed and mounted in an electronic device such as a mobile phone or a video camera, and pin-shaped electrodes (not shown) on the device side are attached to a plurality of rectangular-shaped electrodes 10. Is elastically contacted, and the switching element 2, the control element 5 and the like are connected to a battery (not shown) or an electronic circuit (not shown) of the device through the electrode 10.

  In the above configuration, when the device is carried, the control element 5 detects the voltage of the battery power supply to control the switching element 2, and power is supplied from the battery to the electronic circuit via the switching element 2, so that various devices can be used. The operation is performed.

  Further, when charging the battery, the control element 5 switches the switching element 2 so that, for example, the battery is charged from a household power source, and when the battery is charged with a predetermined voltage, this is controlled by the control element 5. Is detected, the switching element 2 is switched again, and the charging of the battery is completed.

  That is, the control element 5 detects the voltage of the battery power supply, and supplies power from the battery to the electronic circuit via the switching element 2 when in use, and switches the switching element 2 when charging the battery, It is configured to charge the voltage.

  Furthermore, when such a liquid or dust intrudes into the device and adheres to the plurality of terminals 6 of the control element 5 with a particularly small interval during such use, the control element as described above is also used. By forming the insulating coating 9 on the outer periphery of the wire 5, even when some liquid or dust enters, troubles such as a short circuit are prevented and the device is not easily damaged.

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 above conventional battery unit, a relatively expensive resin mold package is used for the switching element 2 and the control element 5, and an insulating film 9 is provided on the outer periphery of the control element 5 in order to prevent a short circuit due to water droplets or the like. Since it forms, it became expensive, and there existed a subject that it was difficult to aim at cost reduction, maintaining reliable electrical contact / separation.

  An object of the present invention is to solve such a conventional problem, and to provide a battery unit that is inexpensive and capable of reliable electrical contact and separation.

  In order to achieve the above object, according to the present invention, a switching element for switching battery power is formed in a chip size package, and the switching element and the control element are arranged in parallel on a wiring board and covered with an insulating film. A battery unit comprising a low-priced chip size package for the switching element, and covering the switching element and the control element arranged in parallel with an insulating film, thereby enabling inexpensive and reliable electrical contact and disconnection. The unit can be obtained.

  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 is inexpensive and capable of performing reliable electrical contact and separation.

  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 perspective view of a battery unit according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view thereof, in which 11 is a wiring board such as paper phenol or glass-filled epoxy, and the upper and lower surfaces are copper. A plurality of wiring patterns (not shown) are formed by foil or the like, and a plurality of lands 13 and 7 are provided on the upper surface.

  Reference numeral 12 denotes a switching element such as an FET or transistor in a chip size package. A plurality of terminals 14 made of solder balls are formed on the lower surface of the semiconductor chip 12A, and the plurality of terminals 14 are formed on a plurality of lands on the upper surface of the wiring board 11. 13 is mounted and connected by solder (not shown).

  Reference numeral 5 denotes a control element such as an IC. A control element 5 of a resin mold package in which the semiconductor chip is covered with an insulating resin such as epoxy is arranged in parallel near the switching element 12 and a plurality of terminals 6. Are mounted and connected to a plurality of lands 7 on the upper surface of the wiring board 11 by soldering, and are connected to the switching element 12 via a wiring pattern.

  Further, 8 is an electronic component such as a fixed resistor or a capacitor. These plural electronic components 8 are mounted and connected to a plurality of lands on the upper surface of the wiring board 11, and are connected to the switching element 12 and the control element 5 through the wiring pattern. In addition, predetermined electronic components, for example, electronic components 8A and 8B are arranged in parallel with the control element 5 and the switching element 12 with a predetermined gap.

  Reference numeral 9 denotes an insulating coating such as epoxy or polyester, which is a resin mold package, but the interval between the plurality of terminals 6 is narrow, and the outer periphery of the control element 5 that needs to prevent a short circuit due to adhesion of water droplets, etc., and the semiconductor chip 12A An insulating film 9 is formed so as to cover the entire surface of the exposed switching element 12.

  Reference numeral 15 denotes a connector in which a plate-like copper alloy or the like is subjected to silver, tin, nickel plating or the like. A substantially U-shaped connection portion 15A is provided above, and a terminal portion 15B protruding downward is a land. The plurality of connectors 15 are connected to the control element 5, the switching element 12 and the like via a wiring pattern to constitute a battery unit.

  When manufacturing such a battery unit, first, as shown in the exploded perspective view of FIG. 3, cream solder (not shown) is printed on the top surfaces of the lands 13 and 7 on the top surface of the wiring substrate 11. The terminal 14 of the switching element 12 is mounted on the land 13, the terminal 6 of the control element 5 is mounted on the land 7, and the terminals of a plurality of electronic components 8, 8A, 8B, etc. are mounted on the other lands.

  Then, after heating, as shown in the perspective view of FIG. 4, the switching element 12, the control element 5, and the plurality of electronic components 8 are soldered to the upper surface of the wiring board 11, and then the through-hole 11 </ b> A of the wiring board 11. The terminal portions 15B of the plurality of connectors 15 are inserted into the connector 15 and the connector 15 is soldered to the lands with a soldering iron or the like.

  Further, a liquid insulating film 9 is simultaneously applied so as to cover the outer periphery of the control element 5 and the entire surface of the switching element 12, and dried to complete the battery unit as shown in FIGS.

  That is, the switching element 12 is formed in a chip size package that is 10 to 30% less expensive than the resin mold package, and the switching element 12 is arranged in parallel in the vicinity of the control element 5, and the insulating coating 9 is provided on the outer periphery of the control element 5. At the time of application, the entire surface of the switching element 12 is also covered with the insulating film 9 so that the battery unit can be formed at a low cost without increasing the number of work steps.

  Further, when this liquid insulating film 9 is applied and dried, the electronic components 8A and 8B are arranged on the left and right sides of the control element 5 and the switching element 12 in parallel with a predetermined gap therebetween. The insulating coating 9 is blocked by these, and does not extend further to the left or right.

  That is, by arranging the electronic components 8A and 8B in parallel on the left and right sides of the control element 5 and the switching element 12, when the battery unit is housed and mounted in an electronic device, it is connected to an electrode (not shown) on the device side. The insulating coating 9 is configured not to extend on the upper surface of the right end of the wiring board 11 with which the connector 15 or a case (not shown) of the device is in contact for holding.

  The battery unit thus configured is housed and mounted in an electronic device such as a mobile phone or a video camera, and the device-side plate-like electrode (in the substantially U-shaped connecting portion 15A of the connector 15 ( The switching element 12 and the control element 5 are connected to a battery (not shown) and an electronic circuit (not shown) of the device through the connector 15.

  That is, the device-side plate-like electrode is press-fitted into the substantially U-shaped connecting portion 15A of the connector 15 while bending it slightly outward, and the inner surface of the connecting portion 15A is elastically formed on the left and right sides of the plate-like electrode. Since the plate-like electrode and the connector 15 are connected so as to be in contact with each other, the device-side pin-like electrode is more reliable and stable than a device in which the pin-like electrode is elastically contacted with a rectangular surface electrode in a dot shape, etc. Electrical connection to the side can be made.

  In the above configuration, when the device is carried, the control element 5 detects the voltage of the battery power supply to control the switching element 12, and power is supplied from the battery to the electronic circuit via the switching element 12. When the operation is performed and the battery is depleted and becomes a predetermined voltage, for example, about 2 V or less, the control element 5 switches the switching element 12 to stop the power supply to the electronic circuit.

  Further, when charging the battery, the control element 5 switches the switching element 12 to charge the battery from, for example, a household power source. When the battery is charged at a predetermined voltage, for example, the voltage of the battery is changed. When it becomes around 4V, the control element 5 detects this, switches the switching element 12 again, and ends the charging of the battery.

  In other words, the control element 5 detects the voltage of the battery power supply, and supplies power from the battery to the electronic circuit via the switching element 12 when in use, and switches the switching element 12 to charge the battery when charging the battery. It is configured to charge the voltage.

  In such use, even if a liquid such as water or dust enters the device, the outer periphery of the control element 5 where the intervals between the plurality of terminals 6 are narrow or the entire surface of the switching element 12 where the semiconductor chip 12A is exposed Since the insulating film 9 is formed and covered as described above, even when some liquid or dust adheres to the insulating film 9, a short circuit or the like is prevented and reliable electrical contact / separation can be performed.

  As described above, according to the present embodiment, the switching element 12 for switching the battery power source is formed with an inexpensive chip size package, and the switching element 12 and the control element 5 are arranged in parallel on the wiring board 11. By covering the surface with the insulating coating 9, it can be manufactured at low cost without increasing the number of work steps, and even if some liquid or dust adheres to it, it is possible to prevent a short circuit and the like. A battery unit capable of contacting and separating can be obtained.

  Further, predetermined electronic components on the upper surface of the wiring board 11, for example, electronic components 8A and 8B, are arranged in parallel with the control element 5 and the switching element 12 with a predetermined gap therebetween, thereby covering the switching element 12 and the control element 5. It is possible to prevent the insulating coating 9 from extending to unnecessary portions.

  Further, by using a connector 15 having a plate-like shape and having a substantially U-shaped connection portion 15A on the upper side, connection with the device-side electrode is performed, thereby ensuring reliable and stable electrical contact with the device side. It becomes possible.

  The battery unit according to the present invention is inexpensive and can be used for reliable electrical contact and separation, and is useful for battery units of various electronic devices.

The perspective view of the battery unit by one implementation of this invention Sectional view Exploded perspective view Same perspective view A perspective view of a conventional battery unit Exploded perspective view Same perspective view

DESCRIPTION OF SYMBOLS 5 Control element 6 Terminal 7, 13 Land 8, 8A, 8B Electronic component 9 Insulation film 11 Wiring board 11A Through-hole 12 Switching element 12A Semiconductor chip 14 Terminal 15 Connector 15A Connection part 15B Terminal part

Claims (1)

It consists of a wiring board on which a plurality of wiring patterns and lands are formed, a switching element that switches battery power, and a control element that detects the voltage of the battery and controls the switching element. The switching element is formed in a chip size package. A battery unit in which the switching element and the control element are arranged in parallel on the wiring board and covered with an insulating film.

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