Positive electrode terminal for button battery and electronic device

Abstract

To provide a positive electrode terminal for a compact button-type battery capable of surface mounting on a substrate and an electronic device including the same.SOLUTION: A positive electrode terminal 3 for a button-type battery has a contact 341 mounted on a substrate 1 and contacts a positive electrode side face 21 of a button-type battery 2. The positive electrode terminal 3 includes a base part 31 having a substrate bonding surface 31a to be bonded to the substrate 1, a protruding part 32 extending from the base part 31 toward the button-type battery 2 side and not bonded to the substrate 1, a body 33 provided to rise from an end part on the button-type battery 2 side of the protruding part 32, and an arm part 34 extending from the body 33 in a direction parallel to the substrate 1 and having a contact 341 at the tip end part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a positive electrode terminal for a button battery having a contact point that comes into contact with the positive electrode side surface of the button battery, and to an electronic device equipped with this positive electrode terminal for a button battery. [Background technology]

[0002] Conventionally, disc-shaped button batteries having a positive electrode side surface and a negative electrode flat surface have been used in various electronic devices. Such electronic devices include a positive electrode terminal having a contact point that contacts the positive electrode side surface of the button battery, a negative electrode terminal having a contact point that contacts the negative electrode flat surface of the button battery, and a substrate on which the positive electrode terminal and the negative electrode terminal are mounted. In recent years, with the trend toward SMD (Surface Mounted Devices) for electronic components, there has been a demand for terminals for button batteries that can be surface-mounted on a substrate. Patent Documents 1 and 2 describe positive electrode terminals for button batteries that are surface-mounted on a substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-87191 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-95309 Summary of the Invention [Problem to be solved by the invention]

[0004] The positive terminal of a button battery that is surface-mounted on a substrate must have a flat surface that can be picked up by the suction nozzle of a mounting machine (chip mounter) and must be able to stand on the substrate. Furthermore, from the perspective of freedom in designing the circuit pattern on the substrate, it is desirable that the size of the land for joining the positive terminal to the substrate be small and that the positive terminal be compact.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a positive electrode terminal for a small button cell battery that can be surface-mounted on a substrate, and an electronic device equipped with the same. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention provides a positive electrode terminal for a button cell battery that is mounted on a substrate and has a contact point that contacts the positive electrode side surface of the button cell battery, the positive electrode terminal comprising: a base portion having a flat substrate bonding surface that is bonded to the substrate; a protruding piece that extends from the base portion toward the button cell battery and is not bonded to the substrate; a body portion that is provided so as to rise from the end of the protruding piece that is on the button cell battery side; and an arm portion that extends from the body portion in a direction parallel to the substrate and has the contact point at its tip. a weight balance portion provided to stand up from an end of the base portion opposite to the button battery; Equipped with The substrate bonding surface is capable of standing on its own with respect to the horizontally placed substrate before being bonded to the substrate. A positive electrode terminal for a button cell battery is provided.

[0007] In addition, to achieve the above-mentioned object, the present invention provides an electronic device having a storage space for storing a button battery, the electronic device comprising: a positive terminal having a contact point that contacts the positive electrode side surface of the button battery; a negative terminal having a contact point that contacts the negative electrode flat surface of the button battery; and a substrate on which the positive electrode terminal and the negative electrode terminal are mounted, wherein the positive electrode terminal is the positive electrode terminal for the above-mentioned button battery. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a positive electrode terminal for a small button battery that can be surface-mounted on a substrate, and an electronic device equipped with the same. [Brief explanation of the drawings]

[0009] [Figure 1] 1(a) and 1(b) are perspective views of a programmable controller using a positive electrode terminal for a button battery according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a positive terminal and a negative terminal for a button cell battery mounted on a substrate. [Figure 3]1A and 1B show the positive and negative terminals without a button battery inserted, where FIG. 1A is a top view and FIG. 1B is a cross-sectional view taken along the line AA in FIG. 1A. [Figure 4] 1A and 1B show the positive and negative terminals with a button cell battery inserted therein, where FIG. 1A is a top view and FIG. 1B is a cross-sectional view taken along the line BB of FIG. [Figure 5] 10 is a cross-sectional view showing a state in which the positive electrode terminal is strongly pressed against the button battery along the insertion direction of the button battery. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Embodiment Mode] An embodiment of the present invention will be described with reference to Figures 1 to 5. The embodiment described below is shown as a preferred specific example for carrying out the present invention, and although various technically preferable technical matters are specifically exemplified, the technical scope of the present invention is not limited to this specific embodiment.

[0011] 1(a) and 1(b) are perspective views showing a programmable controller 100 as an electronic device using a button cell battery terminal according to an embodiment of the present invention. Fig. 1(a) shows a state in which a button cell battery 2 is housed in a case 101 of the programmable controller 100. Fig. 1(b) shows a state in which the button cell battery 2 is housed in the case 101 of the programmable controller 100.

[0012] The programmable controller 100 controls controlled equipment such as machine tools, and operates the controlled equipment based on a sequence program that defines the operation procedures and various interlocks of the controlled equipment. The button battery 2 is used to back up memory that stores the sequence program and the like, and to operate an RTC (Real Time Clock) circuit while power is not supplied to the programmable controller 100.

[0013] The programmable controller 100 houses a circuit board (described later) and various electronic components mounted on the circuit board in a case 101. The programmable controller 100 also includes a holder 102 that holds a button battery 2. The holder 102 is normally housed in the case 101 as shown in FIG. 1(a), and can be protruded from the case 101 as shown in FIG. 1(b) when the button battery 2 is to be replaced. When the holder 102 protrudes from the case 101, the button battery 2 can be inserted into or removed from a storage portion 102a for the button battery 2 in the holder 102.

[0014] After the button battery 2 is stored in the storage section 102a of the holder 102 protruding from the case 101, the holder 102 is then stored in the case 101 together with the button battery 2, whereby the button battery 2 is disposed in the storage space within the case 101. The button battery 2 is disc-shaped, and its outer peripheral surface forms the positive electrode side surface 21. One flat surface of the button battery 2 forms the negative electrode flat surface 22. A positive electrode terminal that contacts the positive electrode side surface 21 of the button battery 2 and a negative electrode terminal that contacts the negative electrode flat surface 22 of the button battery 2 are mounted on a board placed within the case 101.

[0015] (Configuration of positive and negative terminals) FIG. 2 is a perspective view showing the positive and negative terminals 3 and 4 for a button battery mounted on the substrate 1 of the programmable controller 100. FIG. 3 is a structural diagram of the positive and negative terminals 3 and 4 when a button battery 2 is not inserted, where (a) is a top view and (b) is a cross-sectional view taken along line AA of (a). In FIG. 3, the outline of the button battery 2 when inserted is shown by a virtual line (two-dot chain line). FIG. 4 is a structural diagram of the positive and negative terminals 3 and 4 when a button battery 2 is inserted, where (a) is a top view and (b) is a cross-sectional view taken along line BB of (a).

[0016] The substrate 1 has a circuit pattern (not shown) formed on the surface of a flat base material 11 made of an insulating material such as glass epoxy. The substrate 1 has a storage space 10 for storing a button battery 2 held in a holder 102.

[0017] A button battery 2 is inserted into the storage space 10 parallel to the substrate 1 in the insertion direction indicated by the arrow in Figure 2. A positive terminal 3 is surface-mounted on the mounting surface 1a of the substrate 1 so as to contact the positive electrode side surface 21 of the button battery 2, and a negative terminal 4 is surface-mounted so as to contact the negative electrode flat surface 22 of the button battery 2. The positive terminal 3 and negative terminal 4 are formed by press-forming, for example, a 0.2 mm thick stainless steel plate.

[0018] The negative electrode terminal 4 integrally comprises a pair of legs 41 provided at both ends in the insertion direction of the button battery 2 into the storage space 10, a rectangular flat plate portion 42 facing parallel to the mounting surface 1a of the substrate 1 with a gap between the pair of legs 41, a pair of step portions 43 between the pair of legs 41 and the flat plate portion 42, and a pair of tongue portions 44 having contact points 441 that come into contact with the negative electrode plane 22 of the button battery 2.

[0019] The surface of the pair of legs 41 of the negative terminal 4 facing the substrate 1 is a substrate bonding surface 41a, and this substrate bonding surface 41a is soldered to the negative land 12 provided on the substrate 1. The flat plate portion 42 is provided with two openings 420 aligned in a direction perpendicular to the insertion direction of the button battery 2, and a pair of tongue portions 44 extend from one end side of the openings 420 to the other end side in the insertion direction of the button battery 2. A contact 441 is provided at the tip of each of the pair of tongue portions 44, and is in elastic contact with the negative flat surface 22 of the button battery 2.

[0020] The positive terminal 3 is located further back than the negative terminal 4 in the insertion direction of the button battery 2. The positive terminal 3 integrally comprises a base 31 having a flat substrate bonding surface 31a to be bonded to the substrate 1, a flat protruding piece 32 extending from the base 31 toward the button battery 2, a body 33 provided to rise from the end of the protruding piece 32 on the button battery 2 side, a pair of arms 34 extending from the body 33 in a direction parallel to the substrate 1, and a weight balancer 35 provided to rise from the end of the base 31 on the opposite side from the button battery 2. The pair of arms 34 have contacts 341 at their tips that come into contact with the positive electrode side surface 21 of the button battery 2.

[0021] The base portion 31 is flat and has a pair of flat plate portions 311 that sandwich a protruding piece portion 32, and a connecting plate portion 312 that connects the pair of flat plate portions 311. The pair of flat plate portions 311 are aligned in a direction perpendicular to the insertion direction of the button battery 2, and sandwich the protruding piece portion 32 in the same direction. Each of the pair of flat plate portions 311 has a board bonding surface 31a. The connecting plate portion 312 connects the ends of the pair of flat plate portions 311 on the opposite side to the button battery 2 side.

[0022] A notch 310 is provided between each pair of flat plate portions 311 and the protruding piece portion 32. The notch 310 extends from the end of the base portion 31 on the button battery 2 side toward the connecting plate portion 312, parallel to the insertion direction of the button battery 2.

[0023] The surfaces of the pair of flat plate portions 311 facing the substrate 1 are substrate bonding surfaces 31a, and these substrate bonding surfaces 31a are respectively soldered to a pair of positive electrode lands 13 provided on the substrate 1. Each of the pair of flat plate portions 311 is approximately square in shape. The positive electrode lands 13 are formed to have a shape slightly larger than the flat plate portions 311.

[0024] The protruding piece 32 is not joined to the substrate 1, but extends from the connecting plate 312 of the base 31 toward the button battery 2. When no external force is applied to the positive terminal 3, the protruding piece 32 is parallel to the substrate 1. Furthermore, when the pair of arms 34 are pressed strongly in the insertion direction of the button battery 2, the protruding piece 32 is elastically deformable so that the end on the body 33 side moves away from the substrate 1.

[0025] The body 33 is flat and disposed perpendicular to the insertion direction of the button battery 2, facing the positive electrode side surface 21 of the button battery 2 across a gap. The pair of arms 34 extend in opposite directions along the circumferential direction of the button battery 2 from both ends of the body 33 perpendicular to the insertion direction of the button battery 2. As shown in FIG. 4(a), the pair of arms 34 are elastically deformed when the contacts 341 come into contact with and are pressed by the positive electrode side surface 21 of the button battery 2 housed in the housing space 10. The restoring force of the elastically deformed arms 34 causes the contacts 341 to elastically come into contact with the positive electrode side surface 21 of the button battery 2.

[0026] The weight balance portion 35 is provided so as to be continuous with the pair of flat plate portions 311 and the connecting plate portion 312 of the base portion 31 and to be erected perpendicular to the substrate 1. This weight balance portion 35 positions the center of gravity P (see FIG. 3(a)) of the positive terminal 3 when viewed from a direction perpendicular to the substrate 1 at the protruding piece portion 32. This allows the positive terminal 3 to stand on its own on the horizontally placed substrate 1 before the substrate bonding surface 31a is bonded to the substrate 1.

[0027] (Manufacturing method of positive electrode terminal) The positive electrode terminal 3 is manufactured from a long rolled sheet material using a progressive die that feeds the material in sequence. More specifically, the positive electrode terminal 3 is manufactured by punching and bending the sheet material using a die multiple times. The positive electrode terminal 3 has a rectangular shape that is close to a square when developed into a single sheet before bending. More specifically, the ratio of the long side width to the short side width is within 2. The positive electrode terminal 3 has a shape in which the area ratio used as a product exceeds 50% within this rectangular shape.

[0028] Furthermore, the product, which is developed into a single plate before bending, may be cut so that the axis of symmetry of the product is tilted at about 45 degrees to the longitudinal direction of the long plate. Metal plates generally have directional bending characteristics, but by cutting the product so that the axis of symmetry is tilted, the influence of this directionality can be reduced.

[0029] (Positive and negative terminal mounting method) The positive electrode terminal 3 and the negative electrode terminal 4 are mounted on the substrate 1 by a mounting machine. As a preparation step for mounting, cream solder is applied to the pair of positive electrode lands 13 and the pair of negative electrode lands 12 of the substrate 1 by screen printing or the like. The substrate 1 to which the cream solder has been applied is set horizontally in the mounting machine so that the mounting surface 1a faces vertically upward.

[0030] The positive terminal 3 is transported by being vacuum-sucked by the suction nozzle of the mounting machine, and is placed on the mounting surface 1a so that the pair of board joining surfaces 31a of the base portion 31 face the pair of positive electrode lands 13 of the board 1. At this time, the suction nozzle sucks the protruding piece portion 32 of the positive terminal 3. The area that is sucked by the suction nozzle includes the center of gravity P. Similarly, the negative terminal 4 is placed on the mounting surface 1a by the suction nozzle so that the board joining surfaces 41a of the pair of legs 41 face the pair of negative electrode lands 12 to which cream solder has been applied.

[0031] The substrate 1 with the positive terminal 3 and the negative terminal 4 mounted thereon is placed in a reflow furnace with the mounting surface 1a facing up. In the reflow furnace, the cream solder applied to the positive electrode lands 13 and the negative electrode lands 12 melts due to heat, and the substrate bonding surface 31a of the positive electrode terminal 3 is soldered to the positive electrode land 13, and the substrate bonding surface 41a of the negative electrode terminal 4 is soldered to the negative electrode land 12.

[0032] (Positive terminal operation) 5 is a cross-sectional view showing the state when the positive terminal 3 is strongly pressed against the button battery 2 in the insertion direction of the button battery 2. The positive terminal 3 is strongly pressed against the button battery 2, for example, when the holder 102 of the programmable controller 100 is pushed into the case 101. The positive terminal 3 may also be strongly pressed against the button battery 2 when the programmable controller 100 is subjected to strong vibrations or impacts in the vertical direction, for example.

[0033] When the positive terminal 3 is pressed strongly against the button battery 2, the pair of arms 34 elastically deform to open, and the end of the protruding piece 32 on the body 33 side elastically deforms to move away from the substrate 1, absorbing the impact. As the protruding piece 32 deforms, the end of the body 33 opposite the substrate 1 tilts to move away from the button battery 2. This deformation of the protruding piece 32 and the pair of arms 34 reduces the load acting on the joint between the substrate joint surface 31a of the positive terminal 3 and the positive land 13, compared to a case in which the positive terminal 3 does not have the protruding piece 32 and the body 33 is erected from the base 31, and cracks and peeling are suppressed in the solder at this joint.

[0034] (Effects of the embodiment) According to the present embodiment described above, the projection portion 32 is interposed between the base portion 31 and the trunk portion 33, and thus the load acting on the joint between the substrate joint surface 31a and the positive electrode land 13 when the positive electrode terminal 3 is pressed strongly against the button-type battery 2 is alleviated. This allows the sizes of the substrate joint surface 31a and the positive electrode land 13 to be reduced, making it possible to miniaturize the positive electrode terminal 3 and also increasing the degree of freedom in designing the circuit pattern on the substrate 1.

[0035] Furthermore, according to this embodiment, the pair of flat plate portions 311 in the base portion 31 of the positive terminal 3 sandwich the protrusion portion 32, and the protrusion portion 32 extends from the connecting plate portion 312 connecting the pair of flat plate portions 311 toward the button battery 2, thereby making it possible to further miniaturize the positive terminal 3.

[0036] Furthermore, according to this embodiment, the weight balance section 35 is erected from the end of the base section 31 opposite to the button battery 2, so the area occupied by the positive terminal 3 on the mounting surface 1a is not increased by the weight balance section 35. In other words, this configuration of the weight balance section 35 also makes it possible to reduce the size of the positive terminal 3, thereby increasing the degree of freedom in designing the circuit pattern on the substrate 1.

[0037] (Addendum) Although the present invention has been described above based on the embodiments, the invention according to the claims is not limited to these embodiments. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention.

[0038] Furthermore, the present invention can be implemented by omitting some of the components or adding or substituting components within the scope of the spirit of the invention, and can be modified, for example, as follows.

[0039] In the above embodiment, the case where the notch 310 is formed between the pair of flat plate portions 311 and the protruding piece 32 has been described, but this is not limiting, and for example, the protruding piece may extend from the end of the base portion formed in a rectangular shape. Furthermore, the protruding piece does not have to be parallel to the substrate 1, and may be shaped to be easily elastically deformed by the force from the body portion, for example by inclining the end on the body portion side so that it rises above the substrate.

[0040] In the above embodiment, the weight balance portion 35 is described as being in the form of a flat plate bent perpendicularly to the base portion 31, but this is not limiting and the weight balance portion 35 may be bent at an angle relative to the base portion 31.

[0041] In the above embodiment, the base portion 31 is flat, but the present invention is not limited to this. The connecting plate may be spaced apart from the substrate between a pair of flat plates. In this case, the weight balance portion may be provided, for example, on the end of the pair of flat plates opposite the button battery, or on the end of the connecting plate opposite the button battery.

[0042] In the above embodiment, the positive terminal 3 and the negative terminal 4 are mounted on the board 1 of the programmable controller 100, but the positive terminal 3 and the negative terminal 4 may be mounted on the board of other electronic devices. More specifically, the positive terminal 3 and the negative terminal 4 can be used in various electronic devices, such as wireless car keys, various remote controls, thermometers, toys, etc. [Explanation of symbols]

[0043] 1...Substrate 10. Storage space 100...Programmable controller (electronic device) 2... Button cell battery 21...Positive electrode side 3...Positive terminal 31...Base 31a…Board bonding surface 310...Notch 311...Flat plate part 312...Connection plate part 32...Protruding piece 33...Torso 34...Arm 341...Contact point 35...Weight balance section

Claims

1. A positive electrode terminal for a button battery is mounted on a substrate and has a contact point that contacts a positive electrode side surface of the button battery, a base portion having a flat substrate bonding surface to be bonded to the substrate; a protruding piece portion extending from the base portion toward the button battery and not joined to the substrate; a body portion provided to rise from an end of the protruding piece on the button battery side; an arm portion extending from the body portion in a direction parallel to the substrate and having the contact point at a tip thereof; a weight balance portion provided to stand up from an end of the base portion opposite to the button battery, The substrate bonding surface is capable of standing on its own with respect to the horizontally placed substrate before being bonded to the substrate. Positive terminal for button cell batteries.

2. the base portion has a pair of flat plate portions sandwiching the protruding piece portion therebetween and a connecting plate portion connecting the pair of flat plate portions, each of the pair of flat plate portions having the board joining surface; a notch is provided between the pair of flat plate portions and the protruding piece portion, The protruding piece extends from the connecting plate toward the button battery. The positive electrode terminal for a button battery according to claim 1 .

3. An electronic device having a storage space for storing a button battery, a positive electrode terminal having a contact point that contacts the positive electrode side surface of the button battery, a negative electrode terminal having a contact point that contacts the negative electrode flat surface of the button battery, and a substrate on which the positive electrode terminal and the negative electrode terminal are mounted, The positive electrode terminal is the positive electrode terminal for a button battery according to claim 1 or 2. electronic equipment.

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