JP2010250996A - Battery unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery unit which is mainly used for various electronic equipment and can surely perform electrical connection and disconnection at low cost. <P>SOLUTION: In the battery unit, when a terminal 10 on equipment side is connected with an electrode 8 by forming retension layers 14A, 14B with designated height between a plurality of lands 3A, 3B below the electrode 8 whose both ends are soldered, such manufacture can be easily carried out without having time and effort for removing a solder ball since pressing to the electrode 8 caused by a welding rod 11 is prevented by the retension layers 14A, 14B and generation of a solder ball or the like can be prevented. The battery unit capable of preventing short circuit between terminals of a switching element 5 and a control element 6 and surely performing electrical connection and disconnection can be obtained. <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 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. 3 is a cross-sectional view of a conventional battery unit. In FIG. 3, reference numeral 1 denotes a wiring board, and a plurality of wiring patterns 2 are formed on the upper and lower surfaces, and a plurality of wiring patterns 2 provided at predetermined locations on these upper surfaces. An insulating layer 4 is provided to cover other than the land 3.

  Reference numeral 5 denotes a switching element such as an FET or a transistor, 6 denotes a control element such as an IC, 7 denotes an electronic component such as a fixed resistor or a capacitor, and these are mounted on a predetermined land 3 on the upper surface of the wiring board 1 by soldering. In addition, the switching element 5, the control element 6, and a plurality of electronic components 7 are connected via the wiring pattern 2.

  Further, reference numeral 8 denotes a rectangular plate-like electrode, both ends of which are mounted and connected to the lands 3A and 3B by solder 9, and this electrode 8 is connected to the switching element 5 via the wiring pattern 2 to constitute a battery unit. ing.

  When manufacturing such a battery unit, first, a cream-like solder 9 is applied to a plurality of lands 3 and 3A, 3B on the upper surface of the wiring board 1 by printing or the like, and then the switching element 5 or The control element 6 and the terminals of the electronic component 7 and both ends of the electrode 8 are mounted.

  Thereafter, the solder 9 is melted by heating, and the terminals of the switching element 5, the control element 6, the electronic component 7 and both ends of the electrode 8 are soldered to the lands 3, 3 </ b> A, 3 </ b> B, as shown in FIG. 3. Such a battery unit is completed.

  That is, since both terminals of the switching element 5 and the electrodes 8 are placed on the cream-like solder 9 applied to the lands 3, 3 A, and 3 B, the soldering is performed. As shown, a certain amount of gap is formed between the lower surface of the switching element 5 and the electrode 8 and the upper surface of the insulating layer 4 of the wiring board 1.

  The battery unit thus configured is housed and mounted in an electronic device such as a mobile phone or a video camera, and the electrode 8 is a rectangular plate on the device side as shown in the sectional view of FIG. The terminal 10 is spot-welded with a welding rod 11, and the switching element 5, the control element 6, etc. are connected to a battery (not shown) or an electronic circuit (not shown) of the device via the terminal 10 or the electrode 8. Connected.

  In the above configuration, when the device is carried, the control element 6 detects the voltage of the battery power supply to control the switching element 5, and power is supplied from the battery to the electronic circuit via the switching element 5, so that various devices can be used. The operation is performed.

  In addition, when charging the battery, the control element 6 switches the switching element 5 so that, for example, the battery of the device is charged from a household power source, and this is controlled when the battery is charged with a predetermined voltage. The element 6 detects and switches the switching element 5 again, and the charging of the battery is finished.

  That is, the control element 6 detects the voltage of the battery power supply, and supplies power from the battery to the electronic circuit via the switching element 5 when used, and switches the switching element 5 to charge the battery when charging the battery. It was configured to charge the voltage.

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

JP 2009-9969 A

  However, in the conventional battery unit, as shown in FIG. 4B, when spot welding of the electrode 8 and the terminal 10 is performed, the solder 9 at both ends of the electrode 8 is caused by heat and pressure applied by the welding rod 11. In addition to melting, the electrode 8 is pressed downward and moves, and the solder 9 that has flowed out at this time may be generated on the upper surface of the nearby wiring board 1 as a spherical solder ball 9A. Switching by the solder ball 9A In order to prevent problems such as a short circuit between the terminals of the element 5 and the control element 6, it is necessary to remove the solder ball 9A using a separate brush, tweezers, etc., and there is a problem that it takes time to connect to the device. there were.

  An object of the present invention is to solve such a conventional problem, and an object thereof is to provide a battery unit that can be manufactured easily, is inexpensive, and can be securely connected and disconnected.

  In order to achieve the above object, the present invention comprises a battery unit in which a holding layer having a predetermined height is formed between a plurality of lands below an electrode soldered at both ends. When connecting the terminals, the holding layer prevents the welding rod from pressing the electrodes and prevents the generation of solder balls. This eliminates the need for separate removal and enables easy production and switching. A battery unit capable of preventing a short circuit between terminals of the element and the control element and capable of performing reliable electrical contact and separation 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.

Sectional drawing of the battery unit by one embodiment of this invention Sectional view Sectional view of a conventional battery unit Sectional view

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

  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. In FIG. 1, reference numeral 1 denotes a wiring board such as paper phenol or glass-filled epoxy, and a plurality of wiring patterns 2 are formed on upper and lower surfaces by copper foil or the like. And an insulating layer 4 made of epoxy or the like covering the land other than the plurality of lands 3 provided at predetermined positions.

  Reference numeral 5 denotes a switching element such as an FET or a transistor, 6 denotes a control element such as an IC, 7 denotes an electronic component such as a fixed resistor or a capacitor, and these are mounted on a predetermined land 3 on the upper surface of the wiring board 1 by soldering. In addition, the switching element 5, the control element 6, and a plurality of electronic components 7 are connected via the wiring pattern 2.

  Reference numeral 8 denotes a rectangular plate electrode made of nickel or the like, and both ends thereof are mounted and connected to the lands 3A and 3B by solder 9, and the electrode 8 is connected to the switching element 5 through the wiring pattern 2.

  Furthermore, between the lands 3A and 3B on the upper surface of the insulating layer 4 below the electrode 8, a plurality of holding layers 14A and 14B made of epoxy or the like having a predetermined height, for example, a height of about 20 to 60 μm, are overlapped. The lower surface of the electrode 8 is in contact with the upper surface of the holding layer 14A to constitute a battery unit.

  When manufacturing such a battery unit, first, a cream-like solder 9 is applied to a plurality of lands 3 and 3A, 3B on the upper surface of the wiring board 1 by printing or the like, and then the switching element 5 or The control element 6 and the terminals of the electronic component 7 and both ends of the electrode 8 are mounted.

  Thereafter, the solder 9 is melted by heating, and the terminals of the switching element 5, the control element 6, the electronic component 7, and both ends of the electrode 8 are soldered to the lands 3, 3A, 3B, as shown in FIG. Such a battery unit is completed.

  That is, since the terminals of the switching element 5 and the like and both ends of the electrode 8 are placed on the cream-like solder 9 applied to the lands 3, 3 </ b> A, 3 </ b> B, the soldering is performed. As shown, a certain amount of gap is formed between the lower surface of the switching element 5 or the electrode 8 and the upper surface of the insulating layer 4 of the wiring substrate 1, but the upper surfaces of the plurality of holding layers 14 </ b> A are in contact with the lower surface of the electrode 8. It has become a state.

  The battery unit thus configured is housed and mounted in an electronic device such as a mobile phone or a video camera, and the electrode 8 is a rectangular plate on the device side as shown in the cross-sectional view of FIG. The terminal 10 is spot-welded with a welding rod 11, and the switching element 5, the control element 6, etc. are connected to a battery (not shown) or an electronic circuit (not shown) of the device via the terminal 10 or the electrode 8. Connected.

  At this time, as shown in FIG. 2B, the solder 9 at both ends of the electrode 8 is melted by the heat and pressure applied by the welding rod 11 and the electrode 8 is pressed downward. A plurality of holding layers 14A and 14B are formed between the lands 3A and 3B, and the lower surface of the electrode 8 is in contact with the upper surface of the holding layer 14A. Therefore, the electrode 8 does not move downward due to the pressing of the welding rod 11. It is like that.

  That is, by providing the holding layers 14A and 14B in contact with the lower surface of the electrode 8 between the lands 3A and 3B below the electrode 8, it is possible to prevent the welding rod 11 from pressing the electrode 8, and from the molten solder 9 to the solder balls, etc. Is configured not to occur.

  That is, since there is no problem such as a short circuit between terminals due to a solder ball or the like, the switching element 5 and the control element 6 can be securely connected and separated, and there is no need to remove the solder ball or the like with a separate brush or tweezers. It is possible to connect to the equipment without extra effort.

  In the above configuration, when the device is carried, the control element 6 detects the voltage of the battery power supply to control the switching element 5, and power is supplied from the battery to the electronic circuit via the switching element 5, so that various devices can be used. 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 6 switches the switching element 5 to stop the power supply to the electronic circuit.

  Further, when charging the battery, the control element 6 switches the switching element 5 to charge the battery of the device from, for example, a household power supply, and when the battery is charged at a predetermined voltage, for example, When the voltage becomes around 4V, the control element 6 detects this, switches the switching element 5 again, and ends the charging of the battery.

  That is, the control element 6 detects the voltage of the battery power supply, and supplies power from the battery to the electronic circuit via the switching element 5 when used, and switches the switching element 5 to charge the battery when charging the battery. It is configured to charge the voltage.

  At this time, as described above, when the holding layer 14A or 14B contacting the lower surface of the electrode 8 is provided between the lands 3A and 3B below the electrode 8, the terminal 10 on the device side is connected to the electrode 8 The holding layers 14A and 14B can prevent the welding rod 11 from pressing the electrode 8, and can prevent the generation of solder balls and the like.

  In the above description, the configuration in which the plurality of holding layers 14A and 14B are formed to overlap with each other below the electrode 8 has been described. However, the present invention can be implemented even with only one holding layer 14A or 14B. Is possible.

  However, if the holding layers 14A and 14B are too low in height, the above-described effects cannot be obtained. If the holding layers 14A and 14B are too high, it is difficult to connect the lands 3A and 3B. It is preferable to form the cream solder 9 applied to 3A or 3B by printing or the like at substantially the same height.

  As described above, according to the present embodiment, the holding layer 14A or 14B having a predetermined height is formed between the plurality of lands 3A and 3B below the electrode 8 soldered at both ends, whereby the electrode 8 is provided with a device. When the terminal 10 on the side is connected, the holding layer 14A or 14B can prevent the welding rod 11 from pressing the electrode 8, and the generation of solder balls can be prevented. In addition, it is possible to obtain a battery unit that can be easily manufactured and that can prevent a short circuit between the terminals of the switching element 5 and the control element 6 and can perform reliable electrical contact and separation.

  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.

DESCRIPTION OF SYMBOLS 1 Wiring board 2 Wiring pattern 3, 3A, 3B Land 4 Insulating layer 5 Switching element 6 Control element 7 Electronic component 8 Electrode 9 Solder 10 Terminal 11 Welding rod 14A, 14B Holding layer

Claims (1)

A wiring board on which a plurality of wiring patterns and lands are formed, a switching element for switching battery power, a control element for detecting the voltage of the battery and controlling the switching element, and both ends soldered to the plurality of lands A battery unit in which a holding layer having a predetermined height is formed between the plurality of lands below the electrode.

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