JP2007307594A - Rechargeable soldering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rechargeable soldering device the lithium secondary battery of which can be easily quickly charged by placing the rechargeable soldering iron in which the lithium secondary battery which can be charged to 80% battery capacity within 3 min at 20°C is loaded on a soldering iron placing table in which a charging function member is incorporated. <P>SOLUTION: This rechargeable soldering device is equipped with the rechargeable soldering iron which is provided with a clamping member, an iron member which is attached to the clamping member and in which a heater is incorporated and the lithium secondary battery which is loaded so as to connect to the heater and can be charged to the 80% battery capacity within 3 min at 20°C and a soldering iron placing table which has a casing on which the rechargeable soldering iron is placed when the lithium secondary battery requires the charge and the charging function member for charging the lithium secondary battery which is incorporated in the casing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rechargeable soldering apparatus.

  The soldering iron is used, for example, when soldering an electronic component such as an IC, a chip resistor or a chip capacitor, or a jumper wire to a printed wiring board.

  A conventional soldering iron has a structure in which a soldering member incorporating a heater is attached to a holding member made of an insulating material such as plastic, and a power cord for supplying power to the heater is attached to the holding member. However, this soldering iron lowers the work efficiency because the power cord interferes with the soldering work.

  For this reason, Patent Document 1 discloses a rechargeable soldering iron having a cordless structure including a soldering iron incorporating a rechargeable battery and a ironing base having a charger for charging the battery of the soldering iron. ing.

As the rechargeable battery, a nickel cadmium secondary battery or a nickel hydride secondary battery is used. Recently, lithium ion secondary batteries containing a carbon material as a negative electrode material have been used. However, these rechargeable secondary batteries usually require 1 to 2 hours to charge. As a result, when the soldering iron is used frequently or when the soldering iron is used for a long time exceeding the battery capacity, the charging time of the secondary battery is long, that is, the waiting time is long. Since it is long, the efficiency of soldering work is reduced. Although a replacement secondary battery is prepared separately, a decrease in soldering work efficiency can be avoided, but a new cost problem arises.
JP 2000-288724 A

  According to the present invention, the rechargeable soldering iron loaded with a lithium secondary battery capable of charging 80% of the battery capacity within 20 minutes at 3 minutes is placed on the soldering iron mounting table having a built-in charging function member. Provided is a rechargeable soldering apparatus capable of easily and rapidly charging a lithium secondary battery.

According to the present invention, a gripping member, a trowel member attached to the gripping member and including a heater, and loaded into the gripping member so as to be connected to the heater, 20C, 80% battery capacity within 3 minutes. A rechargeable soldering iron provided with a rechargeable lithium secondary battery; and a case on which the rechargeable soldering iron is placed when the lithium secondary battery needs to be charged; A soldering iron mounting table having a charging function member for charging the lithium secondary battery,
A rechargeable soldering device is provided.

  According to the present invention, by placing the rechargeable solder iron on the solder iron mounting table, the rechargeable solder iron and the mounting table can be electrically connected to rapidly charge the lithium secondary battery in the rechargeable solder iron. That is, since the charging waiting time can be drastically reduced, a rechargeable soldering apparatus capable of improving the soldering work efficiency can be provided.

  Hereinafter, a rechargeable soldering apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  1 is a perspective view showing a rechargeable soldering iron of the rechargeable soldering apparatus according to the embodiment, FIG. 2 is a block diagram showing a circuit configuration of the rechargeable soldering iron of FIG. 1, and FIG. 3 is a rechargeable soldering iron according to the embodiment. 4 is a perspective view showing a soldering iron mounting table of the soldering apparatus, and FIG. 4 is a block diagram showing a circuit configuration of the soldering iron mounting table of FIG.

  The rechargeable soldering iron 1 includes a gripping member 2. The gripping member 2 is made of, for example, a first cylindrical insulator 3 made of plastic, and concentrically fitted to the tip of the first cylindrical insulator 3, and has a diameter smaller than that of the cylindrical insulator 3, for example, plastic. A second cylindrical insulator 4 and a tip fixing cap 5 that is concentrically fitted to the tip of the second cylindrical insulator 4 and has a diameter smaller than that of the second cylindrical insulator 4. The ring-shaped positive and negative connection terminals 6, 7 are respectively formed on the distal end side outer peripheral surface of the first cylindrical body gripping member 3 and the distal end side outer peripheral surface of the second cylindrical insulator 4. A cylindrical iron member 9 having a heater 8 described later and having a sharp tip is fitted concentrically to the iron fixing cap 5 of the gripping member 2. A lithium secondary battery 10 capable of being charged at 80% capacity within 3 minutes at 20 C, which will be described later, is loaded in the first cylindrical insulator 3 and connected to the heater 8 and the connection terminals 6 and 7. ing. A switch 11 for turning on / off the power supply to the heater 8 is attached to the first cylindrical insulator 3. The slide-type switch 12 is attached to the first cylindrical insulator 3 and adjusts the resistance value of a variable resistor 13 described later (adjustment of power supplied to the heater 8).

  The circuit configuration of the rechargeable soldering iron 1 will be described with reference to FIG. The lithium secondary battery 10 and the charge control circuit 14 that can be charged at 80% capacity within 20 C for 3 minutes are connected in series between the connection terminals 6 and 7. The charging control circuit 14 is controlled by a microcomputer and has a monitoring function for detecting the voltage and temperature of the lithium secondary battery 10 during charging, an overcharge prevention function, and an overdischarge prevention function for the lithium secondary battery 10. The heater 8, the switch 11, and the variable resistor 13 are connected in series between the connection terminals 6 and 7, and are connected in parallel to the secondary battery 10 and the charge control circuit 14. The variable resistor 13 adjusts the power supplied from the lithium secondary battery 10 to the heater 8 by adjusting the resistance value by the slide switch 12 (for example, two-stage adjustment), and the heating temperature of the heater 8 is adjusted. Control.

  As shown in FIG. 3, the soldering iron mounting table 21 includes a case 22 made of plastic, for example, on which the rechargeable soldering iron 1 is placed when the lithium secondary battery 10 needs to be charged. And a charging function member 23 to be described later for charging the secondary battery 10 built in the battery 22.

  The housing 22 is composed of a block having an inclined surface 24. The inclined surface 24 is formed with a first semi-cylindrical groove 25 on the upper side for inserting the first cylindrical insulator 3 of the gripping member 2 when the rechargeable soldering iron 1 is placed, and The second cylindrical insulator 4 is inserted, and a second semi-cylindrical groove 26 having a radius smaller than the first semi-cylindrical groove 25 is formed on the lower side thereof in communication with the first semi-cylindrical groove 25. Further, the fixing cap 4 and the iron member 9 are inserted, and a third semi-cylindrical groove 27 having a radius smaller than that of the second semi-cylindrical groove 26 communicates with the second semi-cylindrical groove 26 on the lower side thereof. Is formed. One charging terminal 28 having a semi-ring shape is embedded in the first semi-cylindrical groove 25 portion located at the boundary with the second semi-cylindrical groove 26. That is, the charging terminal 28 is embedded in the first semi-cylindrical groove 25 portion where the step portion formed between the first and second semi-cylindrical grooves 25 and 26 is located. The other charging terminal 29 having a semi-ring shape with a smaller radius than the one charging terminal 28 is embedded in the second semi-cylindrical groove 26 located at the boundary with the third semi-cylindrical groove 27. That is, the charging terminal 29 is embedded in the second semi-cylindrical groove 26 portion where the step portion formed between the second and third semi-cylindrical grooves 26 and 27 is located.

  The block-shaped casing 22 is formed with a cavity (not shown) for arranging the charging function member 23. The charge monitoring lamp 30 is provided on the upper side of the casing 22.

  The circuit configuration of the soldering iron mounting table 21 will be described with reference to FIG. The AC / DC converter 31 is connected to a commercial power source 33 through a power cord 32. The converter 31 is connected to the charging terminals 28 and 29 through a charging circuit 34. The charge monitoring lamp circuit 35 is connected to the wiring between the converter 31 and the charging circuit 34 and is connected to the charging monitoring lamp 30. When the charging circuit 34 detects that a predetermined charge has been made during charging of the lithium secondary battery 10 of the rechargeable soldering iron 1, the charge monitor lamp circuit 35 receives the detection signal and turns the charge monitor lamp 30 on. Light. The AC / DC converter 31, the charging circuit 34 and the charge monitoring lamp circuit 35 constitute the charging function member 23.

  The lithium secondary battery includes a negative electrode containing lithium titanium oxide as an active material, and can be charged with a battery capacity of 80% within 20 C for 3 minutes. As disclosed in JP-A-2005-123183, lithium titanium oxide as an active material is a material capable of inserting and extracting lithium, and insertion / extraction of lithium ions is around 1.4V to 1.7V / Li. Done. For this reason, even if the secondary battery is rapidly charged with a large current, it is possible to ensure safety without causing lithium deposition compared to the case where a carbon material is used as a conventional negative electrode active material. In addition, since expansion and contraction associated with insertion and extraction of lithium can be suppressed, structural destruction of the negative electrode active material can be suppressed even when rapid charging with 20 C current is repeatedly performed. As a result, a long life can be maintained even when charging and discharging are repeated.

  Specifically, it was confirmed that the lithium ion secondary battery assembled by the following method is a fast charge secondary battery that can be charged to about 80% battery capacity by charging at 20 C for 3 minutes. . Here, “C” is a unit representing a charge / discharge rate, and a rate that can be calculated in one hour when a constant current charge from complete discharge to full charge (or from full charge to complete discharge) is calculated is expressed as 1C. In the case of 1/10 hour, it is expressed as 10C. Therefore, for example, 20C charging requires 20 times as much current as 1C charging.

<Production of negative electrode>
As an active material, lithium titanate (Li ₄ Ti ₅ O ₁₂ ) powder having an average particle diameter of 5 μm and an Li storage potential of 1.55 V (vs. Li / Li ⁺ ), and carbon having an average particle diameter of 0.4 μm as a conductive agent. The powder and polyvinylidene fluoride (PVdF) as a binder were blended in a weight ratio of 90: 7: 3, and these were dispersed in an n-methylpyrrolidone (NMP) solvent to prepare a slurry.

  In addition, the laser diffraction type particle size distribution measuring apparatus (Shimadzu Corporation model number SALD-300) was used for the measurement of the particle diameter of an active material. First, about 0.1 g of a sample was put in a beaker or the like, and then a surfactant and 1 to 2 mL of distilled water were added and stirred sufficiently, and poured into a stirred water tank. The light intensity distribution was measured 64 times at intervals of 2 seconds, the particle size distribution data was analyzed, and the particle size (D50) having a cumulative frequency distribution of 50% was defined as the average particle size.

Next, an aluminum foil (purity: 99.99%) having a thickness of 10 μm was applied to the negative electrode current collector, dried, and then pressed to prepare a negative electrode having an electrode density of 2.4 g / cm ³ .

<Preparation of positive electrode>
Lithium cobalt oxide (LiCoO ₂ ) as an active material, graphite powder as a conductive material, and polyvinylidene fluoride (PVdF) as a binder are blended in a weight ratio of 87: 8: 5. -A slurry was prepared by dispersing in a methylpyrrolidone (NMP) solvent. The slurry was applied to an aluminum foil (purity 99.99%) having a thickness of 15 μm, dried, and then pressed to prepare a positive electrode having an electrode density of 3.5 g / cm ³ .

<Assembly of secondary battery>
An aluminum-containing laminate film having a thickness of 0.1 mm was prepared as a forming material for the container (exterior member). The aluminum layer of this aluminum-containing laminate film had a thickness of about 0.03 mm. Polypropylene was used as the resin for reinforcing the aluminum layer. By laminating the laminate film by heat fusion, a container (exterior member) was obtained, and further housed in a metal aluminum container.

  Next, a strip-like positive electrode terminal was electrically connected to the positive electrode, and a strip-like negative electrode terminal was electrically connected to the negative electrode. A separator made of a polyethylene porous film having a thickness of 12 μm was coated in close contact with the positive electrode. The positive electrode covered with the separator was overlapped with the negative electrode so as to face each other, and these were wound in a spiral shape to produce an electrode group. This electrode group was pressed into a flat shape. An electrode group formed into a flat shape was inserted into a container (exterior member).

LiBF ₄ , which is a lithium salt, is dissolved in an organic solvent in which ethylene carbonate (EC) and γ-butyllactone (GBL) are mixed at a volume ratio (EC: GBL) of 1: 2 to obtain a liquid. A non-aqueous electrolyte was prepared. The obtained nonaqueous electrolyte was poured into the container to assemble a lithium secondary battery. This secondary battery could be used at a full charge voltage of 2.8 V and a discharge end voltage of 1.5 V.

  In the rechargeable soldering apparatus having such a configuration, the switch 11 of the rechargeable soldering iron 1 is turned on to heat the heater 8, thereby raising the temperature of the iron member 9 to the melting temperature of the solder. For example, an IC terminal is inserted into a desired land of a printed wiring board, and a solder wire drawn from a coil is brought into contact with the tip of the iron member 9 while the sharp tip of the iron member 9 is applied to the terminal inserted into the land, Solder is performed by flowing the molten solder to the terminals. The temperature of the iron member 9 can be controlled to be high or low depending on the type of solder or the like by adjusting the variable resistor 13.

  In the above-described soldering operation, when the capacity of the lithium secondary battery 10 of the rechargeable soldering iron 1 decreases, the switch 11 is turned off, and the rechargeable soldering iron 1 is placed in the housing of the soldering iron mounting table 21 as shown in FIG. 22 is placed. That is, when the rechargeable soldering iron 1 is inclined and the first cylindrical insulator 3 of the holding member 2 is inserted into the first semi-cylindrical groove 25 of the inclined surface 24 of the housing 22, the first circle of the holding member 2 is obtained. The columnar insulator 3 descends along the first semi-cylindrical groove 25, and the step portion formed at the tip (lower end) of the first cylindrical insulator 3 between the first and second semi-cylindrical grooves 25, 26. At the same time, the tip end (lower end) of the second cylindrical insulator 4 of the gripping member 2 is engaged with a step formed between the second and third semi-cylindrical grooves 26 and 27, so that the rechargeable The soldering iron 1 is set at a predetermined position of the housing 22. At this time, the ring-shaped connection terminal 6 formed on the outer peripheral surface of the front end of the first cylindrical insulator 3 of the rechargeable soldering iron 1 and the semi-ring-shaped charging embedded in the first semi-cylindrical groove 25 of the housing 22. The terminal 28 is contacted and connected. Also, a ring-shaped connection terminal 7 formed on the outer peripheral surface of the tip of the second cylindrical insulator 4 of the rechargeable soldering iron 1 and a half-ring-shaped charging terminal embedded in the second semi-cylindrical groove 26 of the housing 22 29 is contacted and connected. In this state, when the charging functional member 23 of the soldering iron mounting table 21 is connected to the commercial power supply 33 through the power cord 32, the AC power from the commercial power supply 33 is converted into direct current by the AC / DC converter 31, and the lithium DC power having a voltage suitable for the secondary battery 10 is supplied to the lithium secondary battery 10 from the charging terminals 28 and 29 and the connection terminals 6 and 7, and charging of 80% battery capacity within 20 minutes at 3 minutes, that is, rapid charging. Charging is done. When the charging circuit 34 detects the completion of charging of the lithium secondary battery 10, the charging monitoring lamp circuit 35 receives the detection signal and turns on the charging monitoring lamp 30. After the charge monitoring lamp 30 is turned on, the rechargeable soldering iron 1 is removed from the soldering iron mounting table 21, whereby the heater 8 of the rechargeable soldering iron 1 can be heated again to a temperature suitable for solder melting, that is, solder. It is possible to return to a state applicable to the attaching work.

  According to the embodiment described above, when the capacity of the rapidly chargeable lithium secondary battery 10 loaded in the soldering operation by the rechargeable soldering iron 1 is reduced, the switch 11 is turned off, and the rechargeable soldering is performed. By placing the iron 1 on the soldering iron mounting table 21 and connecting the connection terminals 6 and 7 on the lithium secondary battery 10 side and the charging terminals 28 and 29 on the charging function member 23 side, respectively, the lithium secondary battery 10 is connected. Can be charged with 80% battery capacity within 20 minutes at 20 C, that is, rapid charging can be performed, so that the work loss associated with the charging waiting time can be drastically reduced. As a result, it is possible to provide a rechargeable soldering apparatus that can efficiently perform soldering work such as terminal connection (IC mounting) of an IC to a printed wiring board.

The perspective view which shows the rechargeable soldering iron of the rechargeable soldering apparatus which concerns on embodiment. The block diagram which shows the circuit structure of the rechargeable soldering iron of FIG. The perspective view which shows the soldering iron mounting base of the rechargeable soldering apparatus which concerns on embodiment. The block diagram which shows the circuit structure of the soldering iron mounting base of FIG. The perspective view which shows the state which mounted the rechargeable soldering iron on the soldering iron mounting base for charge.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rechargeable soldering iron, 2 ... Holding member, 3 ... 1st cylindrical insulator, 4 ... 2nd cylindrical insulator, 6, 7 ... Connection terminal, 10 ... Lithium secondary battery, 11 ... Switch, 21 ... Soldering iron mounting table, 22 ... housing, 23 ... charging function member, 25, 26, 27 ... semi-cylindrical groove, 28, 29 ... charging terminal, 30 ... charge monitoring lamp, 31 ... AC / DC converter, 34 ... charging Circuit, 35 ... charge monitoring light circuit.

Claims (2)

A gripping member, a soldering member attached to the gripping member and having a built-in heater, and lithium loaded in the gripping member so as to be connected to the heater and capable of charging 80% battery capacity within 20 minutes and 3 minutes A rechargeable soldering iron provided with a secondary battery; and a case on which the rechargeable soldering iron is placed when the lithium secondary battery needs to be charged; and the lithium secondary iron incorporated in the case. A soldering iron mounting table having a charging function member for charging the secondary battery;
A rechargeable soldering apparatus comprising: The rechargeable soldering iron has a connection terminal connected to the lithium secondary battery on the gripping member,
The soldering iron mounting table has a groove formed in the housing to be engaged with the gripping member when the rechargeable soldering iron is mounted, and the charging function member of the soldering iron mounting table is An AC / DC converter connected to a power source, a charging circuit connected to the converter, and attached to the groove of the casing and connected to the charging circuit, and the rechargeable soldering iron is attached to the casing The rechargeable soldering apparatus according to claim 1, further comprising a charging terminal connected to the connection terminal of the grip portion when placed.

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