JP2006147394A - Cathode/anode terminal fitting jig for button-shaped lithium battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cathode/anode terminal fitting jig for a button-shaped lithium battery having terminals with high dimensional accuracy and high operation efficiency, capable of corresponding to many kinds of batteries. <P>SOLUTION: On the cathode/anode terminal fitting jig for a button-shaped lithium battery, an anode side jig is composed of a concave part holding an anode terminal, a metal fitting having a laser beam passing hole and a pair of pins, a spring pressing the metal fitting, and a resin member on which the metal fitting is expansion and contraction capably held by the spring, and a cathode side jig has a concave part holding a cathode terminal, a metal part having a laser beam passing hole, a resin plate holding the battery, and a bush made of insulation material fitting into the pins on the anode side jig, and composed of the metal part, the resin plate, and a resin member fixing and holding the bush. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a welding jig used for attaching a terminal of a button-type lithium battery.

  The technological innovations seen in mobile phones, etc. are strikingly competing with each manufacturer for increased functionality, downsizing, and thinning. For this reason, the mounting density of printed circuit boards is increasingly required to be increased, and at the same time, the precision required for each electronic component constituting the board is becoming stricter.

  As shown in Patent Document 1, a button-type lithium battery is used mainly for memory backup by soldering a positive electrode and a negative electrode of a single battery (hereinafter referred to as a unit cell) with terminals welded to a substrate.

  The button-type lithium battery terminals can be welded to the unit cell and can be anything as long as it has a low electrical resistance. However, the SUS thin plate material close to the positive and negative electrode bodies that normally constitute the unit cell is plated with nickel on the entire surface. In order to facilitate the circuit and soldering, it is common to use a pre-solder-plated portion for soldering to the substrate.

  In addition, welding includes resistance welding, laser welding, and the like, and ensures electrical connection between the substrate circuit and the unit cell. From the viewpoint of welding reliability, automatic or semi-automatic laser welding is generally used. Furthermore, the shape of the terminal depends on the size and thickness of the unit cell and on the circuit pattern on the substrate, but there are more on the substrate circuit pattern than on the unit cell shape. Often different for each model. Soldering the board and battery terminals with hand solder, using a soldering iron, making a hole slightly larger than the tip of the terminal on the board circuit, inserting the terminal into it, and passing it through the solder bath, mounting on the board circuit There are reflow solders by applying solder cream on the part and automatically mounting the solder surface of the battery terminals on it, and passing it through a high temperature atmosphere. However, the work man-hours and the mounting density are high (because components can be mounted on the back and front of the board In recent years, a lot of reflow solder has been used.

  As described above, since the terminal and the circuit pattern are only about 0.2 mm where the gap between the circuits is small due to the high mounting density, the shape of the terminal and the precision of the dimensional accuracy are required. For such terminal welding of a battery that requires high accuracy, laser welding is used to ensure electrical connection between the substrate circuit and the unit cell and to ensure welding reliability against a drop impact or the like. However, there are semi-automatic and fully automatic laser welding equipment, but in the case of mass production of one product type, the automatic machine is the most suitable and reliable, but the equipment production period is long, and the equipment cost is tens of millions of yen per machine. There is a drawback that it takes several millions of yen to switch over the varieties, so it is possible to amortize the equipment as quickly as possible while the equipment is undergoing a rapid model change as in recent years. The most suitable equipment is the most suitable, and the semi-automatic welding method has been reviewed. However, in the case of semi-automatic operation, work by humans is involved, so there is a disadvantage that the processing fee is higher than that of an automatic machine. Therefore, an operation method that is as efficient as possible is required.

Conventionally, in this type of work, the jig and the negative electrode terminal that are processed to hold the battery so as to be in contact with the positive electrode terminal and the positive electrode surface of the battery are in contact with the negative electrode surface of the battery in contact with the position to be welded. Using a welding jig consisting of a pair of holding jigs, the operator can pack the battery, positive and negative terminals in a jig machined with resin, and place the jig together with the jig on the welding machine. It was taken.
JP-A-8-55614

  However, in such a method, first, a terminal and a battery are packed in one jig and welded, and then removed and transferred to a jig in which the other negative electrode terminal is packed and welded. In other words, since the positive and negative terminals are welded in a separate process, the work efficiency is poor, and there are drawbacks such that the terminals are easily deformed during transfer.

  Furthermore, since the jig is processed with resin from the viewpoint of preventing short circuit of the battery, the cost is low. However, the resin processing is generally inferior in processing accuracy and quicker than metal processing. The dent for positioning the terminal requires a very high accuracy because the terminal thickness is very thin, 0.1 to 0.15 mm. However, the edge of the recess is worn out quickly because the punched edge of the terminal touches each time the terminal is installed. It becomes difficult to hold the terminal in the correct position.

  In order to solve the above-described problems, the present invention provides a button-type lithium battery with a terminal having high dimensional accuracy, high work efficiency, and a variety of types, and a negative electrode-side jig holding a negative electrode terminal; , A metal fitting having a laser light passage hole and a pair of pins, a spring that presses the metal fitting, and a resin member in which the metal fitting is held elastically by the spring, and the positive electrode side jig holds the positive electrode terminal. And a metal plate having a laser passage hole, a resin plate for holding the battery, and a bush made of an insulating material fitted to a pin of the negative side jig, the metal portion, the resin plate, and the A button-type lithium battery positive / negative terminal attaching jig composed of a resin member for fixing and holding the bush is used.

  According to the button-type lithium battery terminal attaching jig of the present invention, it is the same as the conventional example that the positive and negative electrode terminals and a pair of jigs for holding the battery are configured, but the main part relating to dimensional accuracy is The reliability of the dimensional accuracy of the battery with terminals can be drastically improved by increasing the processing accuracy with metal instead of resin, and eliminating the damage of the terminal holding portion due to wear.

  The present invention provides a jig for a button-type lithium battery with a terminal that has high dimensional accuracy, high work efficiency, and can be used for various types.

  The present invention is a jig for attaching a positive and negative electrode terminal for a button-type lithium battery comprising a negative electrode side jig and a positive electrode side jig, the negative electrode side jig holding a negative electrode terminal, a laser light passage hole, A metal fitting having a pair of pins, a spring that presses the metal fitting, and a resin member that is held by the spring so that the metal fitting can be expanded and contracted. A resin having a metal part having a passage hole, a resin plate for holding a battery, and a bush made of an insulating material fitted to a pin of the negative side jig, and fixing and holding the metal part, the resin plate, and the bush It is comprised with a member, It is characterized by the above-mentioned.

  Also, an assembly of negative electrode side jigs made of a negative electrode side resin member in which concave portions for holding a plurality of negative electrode terminals and laser light passage holes are arranged, and a metal having concave portions for holding a plurality of positive electrode terminals and laser passage holes An assembly of positive electrode side jigs made of a positive electrode side resin member in which the portion is arranged is engaged by a pair of pins. Further, the resin member has a suction hole that is engaged with the assembly of the negative side jig and is provided at a position corresponding to the assembly of the positive side jig, and a passage formed by connecting the suction holes. It is preferable that a jig having an opening / closing means is provided at a connection portion between the passage and the suction hole.

  Moreover, in the negative electrode side jig, it is preferable that the holding surface in the recess for holding the terminal protrudes more than the resin member and is configured to be extendable to the resin member surface. It is preferable that the thickness of the resin plate holding the battery is equal to or less than the thickness of the battery.

  Further, it is more preferable that an insulating coating treatment is applied to the surfaces of the positive electrode terminal, the negative electrode terminal, and the metal part in contact with the battery. In addition, as an insulation process, DLC (Diamond Like Carbon) process etc. are mentioned.

  By adopting the above configuration, the jig for holding the positive electrode terminal, the battery, and the jig for holding only the negative electrode terminal are fitted and used as an integrated jig, eliminating the work of transferring the battery. The work man-hours can be halved except for deformation factors.

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

  FIG. 1 shows a general shape of a button-type battery with a terminal using a welding jig according to the present invention. Reference numeral 1 denotes a case and a positive electrode of the battery, and reference numeral 2 denotes a negative electrode of the battery, which includes a positive electrode element, a negative electrode element, and an electrolytic solution, and is sealed through an insulating resin to constitute one unit cell. Reference numeral 3 denotes a positive electrode terminal, and reference numeral 4 denotes a negative electrode terminal, which are connected to one pole of the unit cell by a plurality of spot welds 5 by laser. The size of the battery is Φ4 (nominal), the thickness is 1.4 mm, the terminal is 0.1 mm thick, the width is 2 mm, and the length is generally 1.5 mm from the end face of the battery. Product dimensional tolerance is ± 0.2 mm. A product dimensional tolerance of ± 0.2 mm requires extremely strict accuracy, such as a variation in measurement results that a stable product cannot be produced unless σ = 0.03 or less.

  The welding jig according to the present invention will be described in detail with reference to FIGS.

  FIG. 2A shows a negative electrode side jig in which a negative electrode side concave portion 6 (depth is about 0.1 mm which is substantially the same as the terminal thickness) holding the negative electrode terminal 4 and a laser beam passage hole 7 through which the laser beam passes is processed. The metal member 8 and the resin member 10 holding the two pins 9 press-fitted and fixed thereto and the negative electrode metal member 8 are shown. In FIG. 2B, the resin plate 12 and the metal plate 13 are fastened with screws 18 to form an integral structure with a positive side jig. The resin plate 12 is fitted with the battery holding hole 14 and the positive electrode side recess 15 (the depth is about 0.1 mm which is the same as the terminal thickness) holding the negative electrode terminal 3, the laser light passage hole 16 and the pin 9 of FIG. A mating insulating bush 17 is press-fitted through the metal plate 13.

  FIG. 3A shows a cross-sectional view of the state before combining the positive and negative electrode jigs shown in FIG. 2A and FIG. 2B, and FIG. 3B shows that the positive and negative electrode jigs are fitted. A sectional view of the state is shown. In FIG. 3A, a pin 9 is press-fitted and fixed to the negative electrode fitting 8 and is pressed downward in the drawing by a spring 22 so as to protrude from the negative electrode side resin member 10 by a dimension Amm. The metal fitting holds the negative electrode terminal 4 as shown in the figure. The spring holding lid 11 is a lid of a spring 22 and has a laser beam passage hole 23 for allowing laser beam to pass therethrough, and is fixed to the negative electrode side resin member 10 by a screw 19. In the lower diagram of FIG. 3A, the battery and the positive electrode terminal 3 are held as shown in the figure by a jig on the positive electrode side. The positive electrode jig shown in FIG. 2B is fixed to the positive electrode side resin member 20 with screws 25. The laser beam passage hole 24 is a hole through which the laser beam passes in the positive electrode side resin member 20, and the pin 9 fixed to the negative electrode fitting 8 is fitted with the insulating bush 17 to guarantee the positional relationship between the terminal and the battery. . In this state, the negative electrode fitting 8 presses the battery and the positive and negative terminals, and moves backward in the figure. The laser light passes through the openings 23 and 7 and hits the upper surface of the negative electrode terminal 4 to weld the negative electrode terminal to the battery. In the positive electrode terminal welding, the jig is reversed in this state, and similarly, the positive electrode terminal surface is welded through the openings 24 and 16 on the positive electrode side. In terminal welding by laser, it is important that each terminal is in contact with the battery without any gaps. For this purpose, the dimension A in FIG. 3A is 0.5 mm or more in the embodiment, and is processed to be thinner than the thickness of the battery with the upper limit of the thickness of the resin plate 12 holding the battery as shown in FIG. 3B. When the jig was combined, each terminal was securely pressed against the battery. If the pressure applied to the terminal is too strong, the terminal and the battery are deformed. If it is too weak, the contact between the terminal and the battery cannot be maintained. Therefore, the pressure suitability value of the spring 22 is 4.9 to 9.8 N, and in the embodiment, it is 7.8 N.

  FIG. 4A shows a negative electrode jig 50 according to an embodiment in which ten negative electrode jigs shown in FIG. 2A are arranged on the negative electrode side resin member 10. Reference numeral 27 denotes a positioning hole when combined with the positive electrode jig.

  FIG. 4B shows a positive electrode jig 51 of an embodiment in which 10 positive electrode jigs of FIG. 2B are arranged on the positive electrode side resin member 20. The pin 26 fits into the positioning hole 27 in FIG. 4A to guarantee the positional relationship between the negative electrode jig 50 and the positive electrode jig 51.

  FIG. 5 shows a state in which FIGS. 4A and 4B are combined, and FIG. 6 shows a cross-sectional view thereof. In FIG. 6, the negative electrode jig 50 and the positive electrode jig 51 are integrally fixed with a screw 28 without a gap.

  FIG. 7 shows a jig used when the negative electrode terminal 4 is inserted into the negative electrode jig 50 (FIG. 4A) and combined with the positive electrode jig 51, and the jigs arranged on the negative electrode jig 50 on the resin member 29. The air holes 21 (10 pieces) are provided in accordance with the pitch, and one air passage 30 is processed by collecting these air holes. The collected passages 30 are connected to suction means such as a compressor by a hose 32. In FIG. 7, the negative electrode terminal 4 inserted on the negative electrode jig 50 is adsorbed to the negative electrode fitting 8 through the air holes 21 and 30 in the direction of the arrow. It is used to prevent the negative electrode terminal from dropping when the negative electrode terminal is inserted in FIG. An on-off valve 60 is provided on the suction hose so that the suction force can be released when the negative electrode jig 50 is combined with the positive electrode jig 51.

  FIG. 8 shows a state in which the jig 52 of the present invention combined in the above order is set and welded to a laser welding apparatus. Reference numeral 61 denotes a jig base which includes a pair of clamping devices 54 and is rotatably mounted on the welding table 63. 62 is a reversing device for the jig base 61, and the jig 52 is held at a predetermined position by the clamping device 54. Reference numeral 55 denotes a laser irradiation port, which moves at an equal pitch in the direction of arrow 65 and first welds the negative electrode side terminal. When the negative electrode side welding is completed, the jig base is reversed in the direction of the arrow 52 and the positive electrode side terminal is welded.

  According to this manufacturing method, after the terminal and the battery are each inserted manually into the jig, the jig 52 is set on the jig base 61 in FIG. It is configured so that all operations up to reversal, positive terminal welding and clamp release can be performed automatically.

  The negative electrode jig 50 and the positive electrode jig 51 in FIGS. 4A and 4B are aggregates of the positive and negative electrode jigs in FIGS. 2A and 2B, respectively. Since they are common, it is only necessary to replace these jigs when switching the type.

  A manufacturing method according to a conventional example will be described below.

  FIG. 9A shows a cross-sectional view of the combination part of the negative electrode jig. 35 is a resin member that holds the negative electrode terminal, and a recess 50 that holds the terminal and a hole 50 through which the laser beam passes are processed. A resin member 36 for holding the battery is fixed integrally with the terminal holding member 35 and constitutes a negative electrode jig 56. 58 is a pressing jig used for welding, and includes a pressing pin 38 and a spring 39 that presses the pressing pin 38 on the resin member 37, and is commonly used for welding positive and negative electrodes. FIG. 9B shows a cross-sectional view of the combination portion of the positive electrode jig, and the configuration is substantially the same as that of the negative electrode jig.

  10 (a) and 10 (b) are general views of FIGS. 9 (a) and 9 (b), and FIG. 10 (c) is an overall view of a common holding jig 58, and is on the negative electrode side. 10 (a) and the holding jig shown in FIG. 10 (c) are combined, and when the positive electrode side is welded, the positive electrode jig shown in FIG. 10 (b). And a pressing jig shown in FIG.

  11 (a) and 11 (b) are combined sectional views of the positive and negative electrode jigs and the holding jig, and are positioned and fitted by pins 48 and then fixed by screws 49. FIG.

  In the conventional example, after the negative electrode side jig shown in FIG. 11A is configured, the jig is taken out after being attached to a welding apparatus as shown in FIG. 8 and welding the negative electrode terminal. Next, the holding jig and the negative electrode jig shown in FIG. 10C are disassembled, and the battery is taken out and inserted into the positive electrode jig shown in FIG. Next, in combination with the holding jig, it is mounted again on the welding apparatus and positive electrode welding is performed.

  In such a series of operations, the welding operation is performed in two steps, so that the work efficiency is poor, and there is a risk that the terminal may be bent due to the battery replacement operation. In addition, the accuracy is reduced because the mounting portion of the terminal is processed with resin.

  Provided is a battery with a button-type terminal having high dimensional accuracy by using the jig of the present invention that has good work efficiency, is inexpensive, and can be switched between various types.

  According to the manufacturing method of the present invention, the terminal and the battery are each manually operated until they are inserted into the jig, but after the jig is set in the welding machine, all processes up to negative terminal welding, reversal, and positive terminal welding are automatically performed. Therefore, the work efficiency is less than half of the conventional efficiency.

  In addition, since a metal is used for the portion holding the terminal, it is possible to manufacture a battery with a terminal with little wear and extremely high dimensional accuracy, and the industrial utility value is very high.

Overview of a battery with a terminal according to an embodiment of the present invention. (A) The figure showing the negative electrode jig concerning the Example of this invention (b) The figure showing the positive electrode jig concerning the Example of this invention (A) Cross-sectional view just before combining positive and negative electrode jigs according to an embodiment of the present invention (b) Cross-sectional view of a state where positive and negative electrode jigs according to an embodiment of the present invention are combined (A) Overall view of a negative electrode jig according to an embodiment of the present invention (b) Overall view of a positive electrode jig according to an embodiment of the present invention Overall view of combined state of positive and negative electrode jigs according to an embodiment of the present invention Sectional drawing of the state with which the positive / negative electrode jig | tool concerning the Example of this invention was combined. The whole figure of the jig concerning the example of the present invention. Laser welding equipment used in the manufacturing method according to the embodiment of the present invention (A) Cross-sectional view of a single structure of a conventional negative electrode jig (b) Cross-sectional view of a single structure of a conventional positive electrode jig (A) Overall view of a conventional negative electrode jig (b) Overall view of a conventional positive electrode jig (c) Overall view of a conventional jig (A) Cross-sectional view of a conventional negative electrode jig (b) Cross-sectional view of a conventional positive electrode jig

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Negative electrode 3 Positive electrode terminal 4 Negative electrode terminal 6 Negative electrode side recessed part 7 Laser light passage hole 8 Negative electrode metal fitting 9 Pin 10 Negative electrode side resin member 11 Spring pressure cover 12 Resin plate 13 Metal plate 14 Battery holding hole 15 Positive electrode side recessed part 16 Laser light Passing hole 17 Insulating bush 20 Positive electrode side resin member 22 Spring 23 Laser beam passing hole 24 Laser beam passing hole

Claims (6)

A jig for attaching a positive / negative terminal for a button-type lithium battery comprising a negative electrode side jig and a positive electrode side jig, wherein the negative electrode side jig has a recess for holding the negative electrode terminal, a laser light passage hole and a pair of pins. A metal member, a spring that presses the metal member, and a resin member that is held by the spring so that the metal member can be expanded and contracted. A metal part, a resin plate that holds the battery, and a bush made of an insulating material that fits into a pin of the negative side jig, and a resin member that fixes and holds the metal part, the resin plate, and the bush Positive and negative terminal attachment jig for button-type lithium batteries. A jig for attaching positive and negative electrode terminals for a button-type lithium battery, comprising an assembly of negative electrode side jigs composed of a negative electrode side resin member in which recesses for holding a plurality of negative electrode terminals and laser light passage holes are arranged, and a plurality of positive electrodes Positive and negative terminal treatment for a button type lithium battery in which an assembly of positive side jigs made of a positive side resin member in which a metal part having a recess for holding a terminal and a laser passage hole is arranged is engaged by a pair of pins. Ingredients. The resin member according to claim 2 is engaged with the assembly of the negative side jig and provided in a position corresponding to the assembly of the positive side jig, and a passage formed by connecting the suction holes. And a positive / negative terminal attaching jig for a button-type lithium battery provided with a jig having an opening / closing means at a connecting portion between the passage and the suction hole. The negative side jig according to claim 1, wherein the holding surface in the concave portion for holding the terminal protrudes from the resin member and can be extended and contracted to the resin member surface. Polar terminal mounting jig. The positive electrode side jig according to claim 1, wherein a thickness of a resin plate holding the battery is equal to or less than a thickness of the battery. 2. The jig for attaching a positive / negative electrode terminal for a button-type lithium battery according to claim 1, wherein an insulating coating treatment is applied to the surfaces of the positive electrode terminal, the negative electrode terminal, and the metal part in contact with the battery.

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