JP2012195202A - Electrochemical cell with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical cell with a terminal which prevents the deterioration from occurring in the connection of a lower surface of a mounting part of a second terminal even though a load such as vibration is applied to the electrochemical cell with the terminal after surface mounting.SOLUTION: A second terminal 23 of an electrochemical cell 20 with a terminal is disposed in a direction of a diagonal line DL of a circumscribed square IQ circumscribed by an electrochemical cell 21. Further, a part (one triangle region) of a mounting part 23c of the second terminal 23 does not protrude outward from two sides forming one corner of the circumscribed square IQ and the other part (two triangle regions) of the mounting part protrudes outward from the two sides forming the one corner of the circumscribed square IQ.

Description

  The present invention relates to a terminal-attached electrochemical cell configured by providing a button-type or coin-type electrochemical cell with a pair of terminals for surface mounting.

  Patent Document 1 (Japanese Patent No. 4570902) discloses a terminal-attached electrochemical cell that reduces the mounting area when surface-mounted on a circuit board. 1 (A) to 1 (C) show an electrochemical cell with a terminal disclosed in Patent Document 1, and the electrochemical cell 10 with a terminal is formed on the surface of a button-type or coin-type electrochemical cell 11. A first terminal 12 and a second terminal 13 for mounting are provided. Incidentally, the + mark shown in FIGS. 1A and 1B indicates the center of the electrochemical cell 11, the square of the two-dot chain line indicates the circumscribed square IQ circumscribing the electrochemical cell 11, and the one-dot chain line The straight line indicates the diagonal line DL of the circumscribed square IQ.

  The electrochemical cell 11 includes a cylindrical cell case 11a having a bottom, a cell cap 11b disposed in an opening of the cell case 11a, and a sealing gasket 11c interposed between the cell case 11a and the cell cap 11b. And a power generation element or a storage element (not shown) enclosed inside the cell case 11a and the cell cap 11b. The electrochemical cell 11 has a predetermined outer diameter and thickness, and one of the cell case 11a and the cell cap 11b is used as a positive electrode, and the other is used as a negative electrode.

  The first terminal 12 is formed by bending a rectangular metal plate having a predetermined thickness twice at different positions, and bends obliquely downward from the rectangular fixed portion 12a and the edge of the fixed portion 12a. The step portion 12b and the rectangular mounting portion 12c extending outward from the edge of the step portion 12b are continuously provided.

  The first terminal 12 has a part of the upper surface of the fixing portion 12a fixed to the circular plane of the cell cap 11b by welding or the like. The bottom surface of the mounting portion 12c is formed when the electrochemical cell 11 is surface-mounted in a posture in which one surface in the thickness direction (the circular plane of the cell cap 11b in the drawing) faces the mounting surface of the circuit board (not shown). The mounting surface is connected to the pads of the circuit board.

  As can be seen from FIG. 1B, the shape of the lower surface of the mounting portion 12c of the first terminal 12 has two long sides having the same dimensions as the boundary line (no reference numeral) between the mounting portion 12c and the stepped portion 12b. A rectangle (see the shaded area in FIG. 1B) surrounded by two short sides with dimensions shorter than the long side, and the boundary line used as one of the two long sides. The lower surface (rectangular surface) of the mounting portion 12c is located inside the circumscribed square IQ.

  The second terminal 13 is formed by bending a metal plate having a substantially rectangular shape and a predetermined thickness twice at different positions, and has a substantially rectangular fixed portion 13a, a width smaller than the fixed portion 13a, and A rectangular leg portion 13b (13b1 indicates a boundary line with the fixing portion 13a) that is bent at a right angle from the end edge of the fixing portion 13a, and a triangular mounting portion that is bent at a right angle from the end edge of the leg portion 13b. Part 13c (13c1 indicates a boundary line with leg part 13b).

  The second terminal 13 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and a part of the lower surface of the fixing portion 13a is fixed to the circular plane of the cell case 11a by welding or the like. The leg portion 13b is a portion that secures a height corresponding to the thickness of the electrochemical cell 11 between the fixing portion 13a and the mounting portion 13c. When one surface in the thickness direction (circular plane of the cell cap 11b in the drawing) is surface-mounted facing the mounting surface of the circuit board (not shown), it becomes a mounting surface that is connected to the pad of the circuit board. Yes.

  As can be seen from FIG. 1B, the shape of the lower surface of the mounting portion 13c of the second terminal 13 is surrounded by a bottom side and two sides having the same dimensions as the boundary line 13c1, and the boundary line 13c1 is the bottom side. The bottom surface (triangular surface) of the mounting portion 13c has two sides forming the apex angle of one corner of the circumscribed square IQ. It is located inside the one corner along the two sides to be formed.

  In the electrochemical cell 10 with terminals, the lower surface (rectangular surface) of the mounting portion 12c of the first terminal 12 and the lower surface (triangular surface) of the mounting portion 13c of the second terminal 13 are connected to the circuit board via a bonding material such as solder. By connecting to the pad, the surface of the electrochemical cell 11 in the thickness direction (circular plane of the cell cap 11b in the drawing) is surface-mounted in a posture facing the mounting surface of the circuit board.

  By the way, in the said electrochemical cell 10 with a terminal, the area of the lower surface (triangular surface) of the mounting part 13c of the 2nd terminal 13 is smaller than the area of the lower surface (rectangular surface) of the mounting part 12c of the 1st terminal 12. Therefore, when a load such as vibration is applied to the electrochemical cell 10 with a terminal after surface mounting, a larger stress is generated on the lower surface of the mounting portion 13c of the second terminal 13 than on the lower surface of the mounting portion 12c of the first terminal 12. There is a possibility that a phenomenon, that is, stress bias may occur, and there is a risk that the connection of the lower surface of the mounting portion 13c of the second terminal 13 may deteriorate due to the stress bias.

Japanese Patent No. 4570902

  An object of the present invention is to provide an electrochemical cell with a terminal capable of preventing deterioration of the connection of the lower surface of the mounting portion of the second terminal even when a load such as vibration is applied to the electrochemical cell with a terminal after surface mounting. There is to do.

  In order to achieve the above object, the present invention provides a button-type or coin-type electric device in which a power generation element or a storage element is enclosed inside a cell case used as one of a positive electrode and a negative electrode and a cell cap used as the other. A chemical cell, a first terminal having a fixed part and a mounting part continuously, the first terminal fixed to one of the cell case and the cell cap, a fixed part, a height securing leg, and a mounting part And the fixed portion is fixed to the other of the cell case and the cell cap, and the electrochemical cell has a surface in the thickness direction mounted on the mounting surface of the circuit board. In the electrochemical cell with a terminal in which the lower surface of the mounting portion of the first terminal and the lower surface of the mounting portion of the second terminal are mounting surfaces connected to the pads of the circuit board when surface mounting is performed in an opposed posture , The second terminal It is arranged in the direction of a diagonal line of a circumscribed square that circumscribes the chemical cell, and a part of the lower surface of the mounting portion of the second terminal does not protrude outward from two sides that form a corner of the circumscribed square. In addition, the remaining portion of the lower surface of the mounting portion protrudes outward from two sides forming one corner of the circumscribed square.

  According to the present invention, the second terminal is arranged in the direction of the diagonal line of the circumscribed square, and a part of the lower surface of the mounting portion of the second terminal extends outward from the two sides forming one corner of the circumscribed square. Since it does not protrude and the remaining portion of the lower surface of the mounting portion protrudes outward from the two sides forming one corner of the circumscribed square, the area of the lower surface of the mounting portion of the second terminal is increased and the first area is increased. Since the difference with the area of the bottom surface of the terminal mounting portion can be reduced, even if a load such as vibration is applied to the electrochemical cell with terminals after surface mounting, the mounting portion of the first terminal is mounted on the bottom surface of the mounting portion of the second terminal. It is possible to suppress the occurrence of a larger stress than the lower surface of the substrate and prevent the connection of the lower surface of the mounting portion from being deteriorated.

  The above object and other objects, structural features, and operational effects of the present invention will become apparent from the following description and the accompanying drawings.

1A is a top view of a conventional electrochemical cell with a terminal, FIG. 1B is a bottom view of the electrochemical cell with a terminal shown in FIG. 1A, and FIG. 1C is FIG. It is the side view which looked at the electrochemical cell with a terminal shown in FIG. 2A is a top view of an electrochemical cell with a terminal to which the present invention is applied (first embodiment), and FIG. 2B is a bottom view of the electrochemical cell with a terminal shown in FIG. 2 (C) is a side view of the electrochemical cell with a terminal shown in FIG. 2 (A) as viewed from the C direction, and FIG. 2 (D) is an enlarged view of a main part of FIG. 2 (B). 3A is a top view of an electrochemical cell with a terminal to which the present invention is applied (second embodiment), and FIG. 3B is a bottom view of the electrochemical cell with a terminal shown in FIG. 3 (C) is a side view of the electrochemical cell with terminals shown in FIG. 3 (A) as seen from the C direction, and FIG. 3 (D) is an enlarged view of the main part of FIG. 3 (B). 4A is a top view of the electrochemical cell with terminals to which the present invention is applied (third embodiment), and FIG. 4B is a bottom view of the electrochemical cell with terminals shown in FIG. 4 (C) is a side view of the electrochemical cell with terminals shown in FIG. 4 (A) as seen from the C direction, and FIG. 4 (D) is an enlarged view of the main part of FIG. 4 (B). 5 (A) and 5 (B) are diagrams respectively showing variations of the shape of the second terminal of the electrochemical cell with terminal shown in FIGS. 4 (A) to 4 (D) (third embodiment). (D) It is a principal part enlarged view of correspondence. 6A is a top view of an electrochemical cell with a terminal to which the present invention is applied (fourth embodiment), and FIG. 6B is a bottom view of the electrochemical cell with a terminal shown in FIG. 6A. 6 (C) is a side view of the electrochemical cell with terminals shown in FIG. 6 (A) as seen from the C direction, and FIG. 6 (D) is an enlarged view of the main part of FIG. 6 (B). 7A is a top view of an electrochemical cell with a terminal to which the present invention is applied (fifth embodiment), FIG. 7B is a bottom view of the electrochemical cell with a terminal shown in FIG. 7 (C) is a side view of the electrochemical cell with terminals shown in FIG. 7 (A) as viewed from the C direction, and FIG. 7 (D) is an enlarged view of the main part of FIG. 7 (B).

[First Embodiment]
2 (A) to 2 (D) show a terminal-attached electrochemical cell (first embodiment) to which the present invention is applied. The terminal-attached electrochemical cell 20 is a button-type or coin-type electrochemical cell. The cell 21 is configured by providing a first terminal 22 and a second terminal 23 for surface mounting. 2A, FIG. 2B, and FIG. 2D indicate the center of the electrochemical cell 21, and the two-dot chain square indicates the circumscribed square IQ that circumscribes the electrochemical cell 21. The dashed-dotted straight line indicates the diagonal line DL of the circumscribed square IQ.

  Hereinafter, the overall structure of the electrochemical cell with terminal 20 will be described, the effect of the electrochemical cell with terminal 20 will be described following the description, and a modification of the shape of the second terminal 23 will be described following the description. .

  The electrochemical cell 21 includes a cylindrical cell case 21a having a bottom, a cell cap 21b disposed in an opening of the cell case 21a, and a sealing gasket 21c interposed between the cell case 21a and the cell cap 21b. And a power generation element or a power storage element (not shown) enclosed inside the cell case 21a and the cell cap 21b. The electrochemical cell 21 has a predetermined outer diameter and thickness, and one of the cell case 21a and the cell cap 21b is used as a positive electrode and the other is used as a negative electrode.

  As the power generation element, a battery suitable for functioning the electrochemical cell 21 as various known batteries, for example, an alkaline battery, a lithium battery, a lithium ion battery, or the like can be used as appropriate, and the electrochemical cell 21 is used as a power storage element. Since various known capacitors, for example, those suitable for functioning as an electric double layer capacitor, a lithium ion capacitor, or the like can be used as appropriate, description thereof is omitted here.

  The first terminal 22 is formed by bending a rectangular metal plate having a predetermined thickness made of nickel, stainless steel, nickel-iron alloy, or the like twice at different positions, and includes a rectangular fixing portion 22a and a fixing portion. A stepped portion 22b that bends obliquely downward from the edge of 22a and a rectangular mounting portion 22c that extends outward from the edge of the stepped portion 22b are continuously provided. Further, a notch 22d is formed at one corner of the fixing portion 22a (one corner closer to the mounting portion 23c of the second terminal 23).

  The first terminal 22 has a part of the upper surface of the fixing portion 22a fixed to the circular plane of the cell cap 21b by a joining method such as laser welding, resistance welding, or ultrasonic welding. The bottom surface of the mounting portion 22c is formed when the electrochemical cell 21 is surface-mounted in a posture in which one surface in the thickness direction (circular plane of the cell cap 21b in the drawing) faces the mounting surface of the circuit board (not shown). The mounting surface is connected to the pads of the circuit board.

  As can be seen from FIG. 2B, the shape of the lower surface of the mounting portion 22c of the first terminal 22 has two long sides having the same dimensions as the boundary line (not indicated) between the mounting portion 22c and the stepped portion 22b. A rectangle (see the shaded area in FIG. 2 (B)) surrounded by two short sides with dimensions shorter than the long side and the boundary line used as one of the two long sides. The angle of the four corners is 90 degrees. The lower surface (rectangular surface) of the mounting portion 22c is positioned so that two sides forming one corner of the rectangle overlap two sides forming one corner of the circumscribed square IQ, and one corner of the rectangle is the circumscribed square. It is located at one corner.

  In short, the lower surface of the mounting portion 22c of the first terminal 22 does not protrude outward from the circumscribed square IQ.

  The second terminal 23 is formed by bending a substantially rectangular metal plate made of nickel, stainless steel, nickel-iron alloy or the like at a predetermined position twice, and having a substantially rectangular fixing portion 23a, A rectangular leg 23b (23b1 indicates a boundary line with the fixing part 23a) having a width smaller than that of the fixing part 23a and bent at a right angle from the end edge of the fixing part 23a, and an end of the leg 23b A rectangular mounting portion 23c (23c1 indicates a boundary line with the leg portion 23b) that is bent at a right angle from the edge is continuously provided.

  The second terminal 23 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and a part of the lower surface of the fixing portion 23a is formed into a circular plane of the cell case 21a by a joining method such as laser welding, resistance welding, or ultrasonic welding. It is fixed. The leg portion 23b is a portion that secures a height corresponding to the thickness of the electrochemical cell 21 between the fixing portion 23a and the mounting portion 23c, and the lower surface of the mounting portion 23c has the electrochemical cell 21 attached thereto. When one surface in the thickness direction (the circular plane of the cell cap 21b in the drawing) faces the mounting surface of the circuit board (not shown), the mounting surface is connected to the pad of the circuit board. Yes.

  As can be seen from FIGS. 2B and 2D, the shape of the lower surface of the mounting portion 23c of the second terminal 23 is two long sides having the same dimension L1 as the boundary line 23c1 and a dimension smaller than the long side. L2 is surrounded by two short sides, and the boundary line 23c1 forms a rectangle (see the shaded area in FIG. 2B) used as one of the two long sides. The angle of the angle is 90 degrees. The lower surface (rectangular surface) of the mounting portion 23c has both ends of the boundary line 23c1 forming the lower surface positioned on two sides forming one corner of the circumscribed square IQ, and is the center of the two long sides of the rectangle Is located on the diagonal line DL. Further, since the dimension L2 of the two short sides of the rectangle is ½ of the dimension L1 of the boundary line 23c1, the center of the outer long side is located at one corner of the circumscribed square IQ.

  In short, a part (one triangular region) of the lower surface (rectangular surface) of the mounting portion 23c of the second terminal 23 does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the mounting portion The remaining portion (two triangular regions) of the lower surface (rectangular surface) of 23c protrudes outward from two sides forming one corner of the circumscribed square IQ. Further, since the lower surface (rectangular surface) of the mounting portion 23c of the second terminal 23 is divided into two equal parts by the diagonal line DL, the remaining portion that protrudes outward from two sides forming one corner of the circumscribed square IQ. The area of (two triangular regions) is the same on both sides of the diagonal line DL.

  In the electrochemical cell 20 with terminals, the lower surface (rectangular surface) of the mounting portion 22c of the first terminal 22 and the lower surface (rectangular surface) of the mounting portion 23c of the second terminal 23 are connected to the circuit board via a bonding material such as solder. By connecting to the pad, the surface of the electrochemical cell 21 in the thickness direction (in the drawing, the circular plane of the cell cap 21b) is surface-mounted in a posture facing the mounting surface of the circuit board.

  In the aforementioned electrochemical cell 20 with a terminal, the second terminal 23 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and the lower surface (rectangular surface) of the mounting portion 23c of the second terminal 23 is arranged. A part (one triangular region) does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the remaining portion (two triangular regions) on the lower surface (rectangular surface) of the mounting portion 23c Projecting outward from the two sides forming one corner of the circumscribed square IQ. That is, the area of the lower surface of the mounting portion 23c of the second terminal 23 can be increased to reduce the difference between the area of the lower surface of the mounting portion 22c of the first terminal 22 and therefore the electrochemical cell 20 with a terminal after surface mounting vibrates. Even when a load such as a load is applied, the lower surface of the mounting portion 23c of the second terminal 23 is restrained from being biased with a larger stress than the lower surface of the mounting portion 22c of the first terminal 22, and the lower surface of the mounting portion 23c is connected. Can be prevented from deteriorating.

  Further, in the above-described electrochemical cell 20 with a terminal, the lower surface (rectangular surface) of the mounting portion 23c of the second terminal 23 has a shape in which the area of the lower surface is divided into two equal parts by a diagonal line DL. The areas of the remaining portions (two triangular regions) projecting outward from the two sides forming one corner of the circumscribed square IQ are the same on both sides of the diagonal line DL. That is, even when the area of the lower surface of the mounting portion 23c of the second terminal 23 is increased, when a load such as vibration is applied to the electrochemical cell 20 with a terminal after surface mounting, the lower surface of the mounting portion 23c of the second terminal 23 Can be made uniform on both sides of the diagonal line DL to contribute to the prevention of the connection deterioration.

  Furthermore, in the electrochemical cell 20 with a terminal described above, the shape of the lower surface of the mounting portion 23c of the second terminal 23 is two long sides having the same dimensions as the boundary line 23c1 between the mounting portion 23c and the leg portion 23b. And two short sides with dimensions smaller than the long side, and the boundary line 23c1 is used as one of the two long sides. That is, the angle of the two corners on the leg 23b side of the lower surface (rectangular surface) of the mounting portion 23c of the second terminal 23 is 90 degrees, and the angle of the other two corners is also 90 degrees. The stress generated on the lower surface of the mounting portion 23c of the second terminal 23 when a load such as vibration is applied to the electrochemical cell 20 with a terminal is suppressed from concentrating on the two corners on the leg portion 23b side, It can contribute to prevention of connection deterioration. On the other hand, in the conventional electrochemical cell 10 with a terminal shown in FIGS. 1A to 1C, the leg 13 b side of the lower surface (triangular surface) of the mounting portion 13 c of the second terminal 13. Since the angle of the two corners is 45 degrees and the angle of the other corner is 90 degrees, the stress generated on the lower surface of the mounting portion 13c is concentrated on the two corners on the leg portion 13b side, which is a small angle. Easy to do.

  Furthermore, in the electrochemical cell 20 with a terminal described above, both ends of the boundary line 23c1 that forms the lower surface of the mounting portion 23c of the second terminal 23 are positioned on two sides that form one corner of the circumscribed square IQ, respectively. The dimension L2 of the two short sides of the rectangle is ½ of the dimension L1 of the boundary line 23c1. That is, even when the area of the lower surface of the mounting portion 23c of the second terminal 23 is increased, the area of the remaining portion (two triangular regions) protruding outward from the two sides forming one corner of the circumscribed square IQ is reduced as much as possible. Thus, it is possible to prevent the mounting area when the surface-mounted electrochemical cell 20 with terminals is surface-mounted on the circuit board from being increased more than necessary.

  Furthermore, in the electrochemical cell 20 with a terminal described above, the lower surface of the mounting portion 23c of the second terminal 23 exists at one corner of the circumscribed square IQ, and the first terminal 22 is disposed at one corner adjacent to one corner of the circumscribed square IQ. A portion of the lower surface of the mounting portion 22c is present, and when the electrochemical cell 20 with terminals is viewed from below, the entire lower surface of the mounting portion 23c of the second terminal 23 is outward from the electrochemical cell 21. A part of the lower surface of the mounting portion 22c of the first terminal 22 protrudes outward from the electrochemical cell 21 with an area comparable to the lower surface area of the mounting portion 23c. That is, when the electrochemical cell 20 with terminals is surface-mounted on the circuit board by reflow soldering, it is possible to suppress the occurrence of soldering defects, for example, the phenomenon that the mounting portion 23c of the second terminal 23 is lifted, that is, the so-called Manhattan phenomenon.

  2A to 2D, the lower surface of the mounting portion 23c of the second terminal 23 has a shape in which the area of the lower surface is “bisected” by a diagonal line DL. Although the area of the remaining portions (two triangular regions) protruding outward from the two sides forming one corner of the circumscribed square IQ is “same” on both sides of the diagonal line DL, the component tolerance or Considering assembly tolerances and deformations after assembly, it is practically difficult to make bisect as it is or to make the same as it is. In addition to “bisected”, “substantially bisected” is included in its meaning, and “same” includes “exactly the same” and “substantially the same” in its meaning.

  Further, in FIGS. 2A to 2D, a “rectangular shape” in which the angles of all four corners are “90 degrees” is shown as the shape of the lower surface of the mounting portion 23c of the second terminal 23. The “rectangle” is a shape in which the outer two corners of the four corners are rounded, or a shape in which the angles of the four corners of the rectangle are not exactly 90 degrees, that is, substantially the same as the rectangle. Any shape that can be identified with each other can be used as appropriate, and the same effects as described above can be exhibited. In addition, the “90 degrees” is based on the premise that the “rectangle” is an accurate rectangle, but includes various shapes that can be substantially identical to the rectangle. And it is not limited to 90 degrees.

  Further, in FIGS. 2A to 2D, both ends of the boundary line 23c1 forming the lower surface of the mounting portion 23c of the second terminal 23 form one corner of the circumscribed square IQ. In the embodiment, the dimension L2 of the two short sides of the rectangle is “½” of the dimension L1 of the boundary line 23c1, but the component tolerance, the assembly tolerance, the deformation after the assembly, etc. Since it is practically difficult to make “positions on two sides” exactly as they mean and to make “1/2” exactly as they mean, “positions on two sides” is “ In addition to “exactly located on each of the two sides”, “substantially located on each of the two sides” is included as the meaning, and “1/2” means “about 1/2” in addition to “exactly ½”. As a meaning.

  Further, in FIGS. 2A to 2D, both ends of the boundary line 23c1 forming the lower surface of the mounting portion 23c of the second terminal 23 form one corner of the circumscribed square IQ. However, both ends of the boundary line 23c1 do not necessarily have to be “positioned on two sides”. For example, two sides of the boundary line 23c1 form one corner of the circumscribed square IQ. Even if a mode in which the both ends of the boundary line 23c1 are positioned slightly outside the two sides forming one corner of the circumscribed square IQ, etc. Can demonstrate.

  Further, FIGS. 2A to 2D show a mode in which the dimension L2 of the two short sides of the rectangle is “½” of the dimension L1 of the boundary line 23c1. The dimension L2 does not necessarily have to be “½” of the dimension L1 of the boundary line 23c1. For example, the dimension L2 is slightly smaller than ½ of the dimension L1 of the boundary line 23c1, or the dimension L2 is the boundary line. Even if an aspect slightly larger than ½ of the dimension L1 of 23c1 is employed, the same effect as described above can be exhibited.

  Further, FIGS. 2A to 2D show the second terminal 23 in which the width of the leg portion 23b is smaller than the width of the fixed portion 23a, but the width of the leg portion 23b is fixed to the fixed portion. Even if the width of the fixing portion 23a is the same as the width of the leg portion 23b, the same effect as described above can be exhibited.

[Second Embodiment]
3 (A) to 3 (D) show a terminal-attached electrochemical cell (second embodiment) to which the present invention is applied. The terminal-attached electrochemical cell 30 is a button-type or coin-type electrochemical cell. The cell 31 includes a first terminal 32 and a second terminal 33 for surface mounting. Incidentally, the + mark shown in FIGS. 3 (A), 3 (B) and 3 (D) indicates the center of the electrochemical cell 31, and the two-dot chain line square is a circumscribed square IQ circumscribing the electrochemical cell 31. The dashed-dotted straight line indicates the diagonal line DL of the circumscribed square IQ.

  In FIG. 3 (A) to FIG. 3 (D), the terminal-attached electrochemical cell 30 is shown by using a number in the thirtieth order to distinguish it from the terminal-attached electrochemical cell 20 (first embodiment). Since the configuration excluding the second terminal 33 of the electrochemical cell 30 with terminal is the same as that of the electrochemical cell 20 with terminal (first embodiment), only the mode of the second terminal 33 will be described here. Subsequently, the effect of the electrochemical cell 30 with a terminal will be described, and subsequently, a modification of the shape of the second terminal 33 will be described.

  The second terminal 33 is formed by bending a substantially rectangular metal plate made of nickel, stainless steel, nickel-iron alloy or the like at a different position twice, and has a substantially rectangular fixing portion 33a; A rectangular leg 33b (33b1 indicates a boundary line with the fixing part 33a) having a width smaller than that of the fixing part 33a and bent at a right angle from the end edge of the fixing part 33a, and an end of the leg 33b A U-shaped mounting portion 33c (33c1 indicates a boundary line with the leg portion 33b) that is bent at a right angle from the edge is continuously provided.

  The second terminal 33 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and a part of the lower surface of the fixing portion 33a is formed into a circular plane of the cell case 31a by a joining method such as laser welding, resistance welding, or ultrasonic welding. It is fixed. The leg portion 33b is a portion that secures a height corresponding to the thickness of the electrochemical cell 31 between the fixing portion 33a and the mounting portion 33c, and the lower surface of the mounting portion 33c has the electrochemical cell 31 attached thereto. When one surface in the thickness direction (in the drawing, the circular plane of the cell cap 31b) is surface-mounted in a posture facing the mounting surface of the circuit board (not shown), the mounting surface is connected to the pad of the circuit board. Yes.

  As can be seen from FIGS. 3B and 3D, the shape of the lower surface of the mounting portion 33c of the second terminal 33 is one line segment having the same dimension L1 as the boundary line 33c1 and one curved line (in the drawing). And the boundary line 33c1 is a U-shape (semi-circular in the drawing, refer to the shaded area in FIG. 3B), and the leg 33b. The angle of the two corners on the side (the angle formed by the tangent at the intersection of the curved line with the line segment and the line segment, represented by θ in FIG. 3D) is 90 degrees. The lower surface (U-shaped surface) of the mounting portion 33c is such that both ends of the boundary line 33c1 that forms the lower surface are located on two sides that form one corner of the circumscribed square IQ, and a line segment that forms a U-shape. The center of the curved line is located on the diagonal line DL. Further, since the dimension L3 corresponding to the height of the U-shape is ½ of the dimension L1 of the boundary line 33c1, the center of the curved line is located at one corner of the circumscribed square IQ.

  In short, a part (one triangular region) of the lower surface (U-shaped surface) of the mounting portion 33c of the second terminal 33 does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the mounting The remaining portion (two arcuate regions) of the lower surface (U-shaped surface) of the portion 33c protrudes outward from the two sides forming one corner of the circumscribed square IQ. Further, since the lower surface (U-shaped surface) of the mounting portion 33c of the second terminal 33 is divided into two equal parts by the diagonal line DL, it protrudes outward from the two sides forming one corner of the circumscribed square IQ. The area of the remaining part (two arcuate regions) is the same on both sides of the diagonal line DL.

  In the electrochemical cell 30 with terminals, the lower surface (rectangular surface) of the mounting portion 32c of the first terminal 32 and the lower surface (U-shaped surface) of the mounting portion 33c of the second terminal 33 are connected to each other via a bonding material such as solder. By connecting to the pad, the surface mounting is performed in such a manner that one surface in the thickness direction of the electrochemical cell 31 (the circular plane of the cell cap 31b in the drawing) faces the mounting surface of the circuit board.

  In the above-described electrochemical cell 30 with a terminal, the second terminal 33 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and the lower surface (U-shaped surface) of the mounting portion 33c of the second terminal 33. Part (one triangular region) of the mounting part 33c does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the remaining part (two arcuate regions) of the lower surface (U-shaped surface) of the mounting portion 33c Protrudes outward from two sides forming one corner of the circumscribed square IQ. That is, since the area of the lower surface of the mounting portion 33c of the second terminal 33 can be increased to reduce the difference between the area of the lower surface of the mounting portion 32c of the first terminal 32, the terminal-attached electrochemical cell 30 after surface mounting vibrates. Even when a load such as a load is applied, the lower surface of the mounting portion 33c of the second terminal 33 is restrained from being biased with a larger stress than the lower surface of the mounting portion 32c of the first terminal 32, and the lower surface of the mounting portion 33c is connected. Can be prevented from deteriorating.

  Further, in the electrochemical cell 30 with terminals described above, the lower surface (U-shaped surface) of the mounting portion 33c of the second terminal 33 has a shape in which the area of the lower surface is divided into two equal parts by a diagonal line DL. Thus, the areas of the remaining portions (two arcuate regions) protruding outward from the two sides forming one corner of the circumscribed square IQ are the same on both sides of the diagonal line DL. That is, even when the area of the lower surface of the mounting portion 33c of the second terminal 33 is increased, when a load such as vibration is applied to the electrochemical cell 30 with a terminal after surface mounting, the lower surface of the mounting portion 33c of the second terminal 33. Can be made uniform on both sides of the diagonal line DL to contribute to the prevention of the connection deterioration.

  Furthermore, in the above-described electrochemical cell 30 with a terminal, the shape of the lower surface of the mounting portion 33c of the second terminal 33 is one line having the same dimension L1 as the boundary line 33c1 between the mounting portion 33c and the leg portion 33b. A U-shape surrounded by a minute and one curved line (a semicircular arc in the drawing), and the boundary line 33c1 is used as the line segment. That is, since the angle of two corners on the leg 33b side of the lower surface (U-shaped surface) of the mounting portion 33c of the second terminal 33 is 90 degrees and there are no other corners, the electrochemical cell with terminals after surface mounting The stress generated on the lower surface of the mounting portion 33c of the second terminal 33 when a load such as vibration is applied to 30 is prevented from concentrating on the two corners on the leg portion 33b side, thereby preventing the above-mentioned connection deterioration. Can contribute. On the other hand, in the conventional electrochemical cell 10 with a terminal shown in FIGS. 1A to 1C, the leg 13 b side of the lower surface (triangular surface) of the mounting portion 13 c of the second terminal 13. Since the angle of the two corners is 45 degrees and the angle of the other corner is 90 degrees, the stress generated on the lower surface of the mounting portion 13c is concentrated on the two corners on the leg portion 13b side, which is a small angle. Easy to do.

  Further, in the electrochemical cell 30 with a terminal described above, both ends of the boundary line 33c1 forming the lower surface of the mounting portion 33c of the second terminal 33 are located on two sides forming one corner of the circumscribed square IQ, respectively. The dimension L3 corresponding to the height of the U-shape is ½ of the dimension L1 of the boundary line 33c1. That is, even when the area of the lower surface of the mounting portion 33c of the second terminal 33 is increased, the area of the remaining portion (two arcuate regions) protruding outward from the two sides forming one corner of the circumscribed square IQ is reduced as much as possible. Thus, it is possible to prevent the mounting area when the electrochemical cell 30 with a terminal 30 is surface-mounted on a circuit board from increasing more than necessary.

  Furthermore, in the electrochemical cell 30 with terminals described above, the lower surface of the mounting portion 33c of the second terminal 33 exists at one corner of the circumscribed square IQ, and the first terminal 32 is disposed at one corner adjacent to one corner of the circumscribed square IQ. A part of the lower surface of the mounting portion 32c is present, and when the electrochemical cell 30 with a terminal is viewed from below, the entire lower surface of the mounting portion 33c of the second terminal 33 is outward from the electrochemical cell 31. A part of the mounting part 32 c of the first terminal 32 protrudes outward from the electrochemical cell 31 with an area that is comparable to the lower surface area of the mounting part 33 c. That is, when the electrochemical cell 30 with a terminal is surface-mounted on a circuit board by reflow soldering, it is possible to suppress the occurrence of soldering failure, for example, a phenomenon that the mounting portion 33c of the second terminal 33 floats, that is, a so-called Manhattan phenomenon.

  3A to 3D, the lower surface of the mounting portion 33c of the second terminal 33 has a shape in which the area of the lower surface is “bisected” by a pair of diagonal lines DL. Although the area of the remaining portions (two arcuate regions) projecting outward from two sides forming one corner of the circumscribed square IQ is “same” on both sides of the diagonal line DL, Considering assembly tolerances and deformations after assembly, it is practically difficult to make bisect as it is or to make the same as it is. In addition to “bisected”, “substantially bisected” is included in its meaning, and “same” includes “exactly the same” and “substantially the same” in its meaning.

  3A to 3D, as the shape of the lower surface of the mounting portion 33c of the second terminal 33, the “U-shape” in which the angle of the two corners on the leg portion 33b side is “90 degrees”. In addition to the semicircular shape shown in the drawings, the “U-shape” is an arc shape whose arc angle is less than 90 degrees, an arc shape whose arc angle exceeds 90 degrees, or a part of an ellipse as the curved line. Any shape using a curve having a non-constant curvature radius, such as a shape close to U, can be used as appropriate, and the same effect as described above can be exhibited. In addition, the “90 degrees” is based on the premise that the “U-shape” is semicircular. However, since the “U-shape” includes various shapes close to U, it is 90 degrees. It is not limited to.

  Further, in FIGS. 3A to 3D, both ends of the boundary line 33c1 forming the lower surface of the mounting portion 33c of the second terminal 33 form one corner of the circumscribed square IQ. Although the dimension L3 corresponding to the height of the U-shape is “1/2” of the dimension L1 of the boundary line 33c1, the part tolerance, the assembly tolerance, the deformation after the assembly, etc. are shown. In consideration, it is practically difficult to make “positions on two sides” exactly as they mean and “1/2” exactly as they mean, so “positions on two sides” is “2”. In addition to “exactly located on each side”, “substantially located on each of the two sides” is included, and “1/2” means “about 1/2” in addition to “exactly 1/2”. Is included as its meaning.

  Further, in FIGS. 3A to 3D, both ends of the boundary line 33c1 forming the lower surface of the mounting portion 33c of the second terminal 33 form one corner of the circumscribed square IQ. However, both ends of the boundary line 33c1 do not necessarily have to be “positioned on two sides”, for example, two sides where the both ends of the boundary line 33c1 form one corner of the circumscribed square IQ. The same effect as described above can be achieved even when the mode slightly located inside or the mode in which both ends of the boundary line 33c1 are positioned slightly outside the two sides forming the circumscribed square IQ is employed. .

  Further, FIGS. 3A to 3D show a mode in which the dimension L3 corresponding to the height of the U-shape is “½” of the dimension L1 of the boundary line 33c1. L3 does not necessarily need to be “½” of the dimension L1 of the boundary line 33c1, for example, an aspect in which the dimension L3 is slightly smaller than ½ of the dimension L1 of the boundary line 33c1, or the dimension L3 is the boundary line 33c1. Even if an aspect slightly larger than 1/2 of the dimension L1 is adopted, the same effect as described above can be exhibited.

  Further, FIGS. 3A to 3D show the second terminal 33 in which the width of the leg portion 33b is smaller than the width of the fixed portion 33a, but the width of the leg portion 33b is fixed to the fixed portion. Even if the width of the fixing portion 33a is the same as the width of the leg portion 33b, the same effect as described above can be exhibited.

[Third Embodiment]
4 (A) to 4 (D) show a terminal-attached electrochemical cell (third embodiment) to which the present invention is applied. The terminal-attached electrochemical cell 40 is a button-type or coin-type electrochemical cell. The cell 41 is configured by providing a first terminal 42 and a second terminal 43 for surface mounting. 4A, FIG. 4B, and FIG. 4D indicate the center of the electrochemical cell 41, and the two-dot chain square indicates the circumscribed square IQ that circumscribes the electrochemical cell 41. The dashed-dotted straight line indicates the diagonal line DL of the circumscribed square IQ.

  4 (A) to 4 (D), the terminal-attached electrochemical cell 40 is shown by using a reference number in the 40's to distinguish it from the terminal-attached electrochemical cell 20 (first embodiment). Since the configuration excluding the second terminal 43 of the electrochemical cell 40 with terminal is the same as that of the electrochemical cell 20 with terminal (first embodiment), only the mode of the second terminal 43 will be described here. Subsequently, the effect of the electrochemical cell 40 with a terminal will be described, and subsequently, a modification of the shape of the second terminal 43 will be described.

  The second terminal 43 is formed by bending a substantially rectangular metal plate made of nickel, stainless steel, nickel-iron alloy or the like at a different position twice, and has a substantially rectangular fixing portion 43a. A rectangular leg 43b (43b1 indicates a boundary line with the fixing part 43a) having a width smaller than that of the fixing part 43a and bent at a right angle from the end edge of the fixing part 43a, and an end of the leg 43b A trapezoidal mounting portion 43c (43c1 indicates a boundary line with the leg portion 43b) that is bent at a right angle from the edge is continuously provided.

  The second terminal 43 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and a part of the lower surface of the fixing portion 43a is formed on the circular plane of the cell case 41a by a joining method such as laser welding, resistance welding, or ultrasonic welding. It is fixed. The leg portion 43b is a portion that secures a height corresponding to the thickness of the electrochemical cell 41 between the fixing portion 43a and the mounting portion 43c, and the lower surface of the mounting portion 43c has the electrochemical cell 41 attached thereto. When one surface in the thickness direction (the circular plane of the cell cap 41b in the drawing) is surface-mounted in a posture facing the mounting surface of the circuit board (not shown), this is a mounting surface connected to the pads of the circuit board. Yes.

  As can be seen from FIGS. 4B and 4D, the shape of the lower surface of the mounting portion 43c of the second terminal 43 is the same as that of the boundary line 43c1 with the lower base of the dimension L1 and the dimension L5 smaller than the lower base. A trapezoid (see the shaded area in FIG. 4B) surrounded by two sides forming an angle θ of 75 degrees with the upper base and the lower base, and the boundary line 43c1 used as the lower base. The angle between the two corners on the leg 43b side is 75 degrees. The lower surface (trapezoidal surface) of the lower surface of the mounting portion 43c is located on the two sides that form one corner of the circumscribed square IQ at both ends of the boundary line 43c1 that forms the lower surface. The center of the bottom is located on the diagonal line DL. Further, since the dimension L4 corresponding to the height of the trapezoid is ½ of the dimension L1 of the boundary line 43c1, the center of the upper base is located at one corner of the circumscribed square IQ.

  In short, a part (one triangular region) of the lower surface (trapezoidal surface) of the mounting portion 43c of the second terminal 43 does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the mounting portion The remaining part (two triangular regions) of the lower surface (trapezoidal surface) of 43c protrudes outward from the two sides forming one corner of the circumscribed square IQ. In addition, since the lower surface (trapezoidal surface) of the mounting portion 43c of the second terminal 43 is divided into two equal parts by the diagonal line DL, the remaining portion that protrudes outward from the two sides forming one corner of the circumscribed square IQ. The area of (two triangular regions) is the same on both sides of the diagonal line DL.

  In the electrochemical cell 40 with a terminal, the lower surface (rectangular surface) of the mounting portion 42c of the first terminal 42 and the lower surface (trapezoid surface) of the mounting portion 43c of the second terminal 43 are connected to the circuit board via a bonding material such as solder. By connecting to the pad, the surface of the electrochemical cell 41 in the thickness direction (circular plane of the cell cap 41b in the drawing) is surface-mounted in a posture facing the mounting surface of the circuit board.

  In the aforementioned electrochemical cell 40 with a terminal, the second terminal 43 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and the lower surface (trapezoidal surface) of the mounting portion 43c of the second terminal 43 is provided. A part (one triangular region) does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the remaining portion (two triangular regions) on the lower surface (trapezoidal surface) of the mounting portion 43c Projecting outward from the two sides forming one corner of the circumscribed square IQ. That is, since the area of the lower surface of the mounting portion 43c of the second terminal 43 can be increased to reduce the difference between the area of the lower surface of the mounting portion 42c of the first terminal 42, the terminal-attached electrochemical cell 40 after surface mounting vibrates. Even when a load such as a load is applied, the lower surface of the mounting portion 43c of the second terminal 43 is prevented from being biased with a larger stress than the lower surface of the mounting portion 42c of the first terminal 42, and the lower surface of the mounting portion 43c is connected. Can be prevented from deteriorating.

  In the above-described electrochemical cell 40 with a terminal, the lower surface (trapezoidal surface) of the mounting portion 43c of the second terminal 43 has a shape in which the area of the lower surface is divided into two equal parts by a diagonal line DL. The areas of the remaining portions (two triangular regions) projecting outward from the two sides forming one corner of the circumscribed square IQ are the same on both sides of the diagonal line DL. That is, even when the area of the lower surface of the mounting portion 43c of the second terminal 43 is increased, the lower surface of the mounting portion 43c of the second terminal 43 when a load such as vibration is applied to the electrochemical cell 40 with a terminal after surface mounting. Can be made uniform on both sides of the diagonal line DL to contribute to the prevention of the connection deterioration.

  Furthermore, in the above-described electrochemical cell 40 with a terminal, the shape of the lower surface of the mounting portion 43c of the second terminal 43 is the same as the lower base of the dimension L1 as the boundary line 43c1 between the mounting portion 43c and the leg portion 43b. The trapezoid is surrounded by two sides that form an angle θ of 75 degrees with the upper base and the lower base of the dimension L5 smaller than the lower base, and the boundary line 43c1 is used as the lower base. . That is, since the angle of two corners on the leg 43b side of the lower surface (trapezoidal surface) of the mounting portion 43c of the second terminal 43 is 75 degrees and the angle of the other two angles is 105 degrees, The stress generated on the lower surface of the mounting portion 43c of the second terminal 43 when a load such as vibration is applied to the electrochemical cell 40 with a terminal is suppressed from concentrating on the two corners on the leg portion 43b side, It can contribute to prevention of connection deterioration. On the other hand, in the conventional electrochemical cell 10 with a terminal shown in FIGS. 1A to 1C, the leg 13 b side of the lower surface (triangular surface) of the mounting portion 13 c of the second terminal 13. Since the angle of the two corners is 45 degrees and the angle of the other corner is 90 degrees, the stress generated on the lower surface of the mounting portion 13c is concentrated on the two corners on the leg portion 13b side, which is a small angle. Easy to do.

  Furthermore, in the above-described electrochemical cell 40 with a terminal, both ends of the boundary line 43c1 forming the lower surface of the mounting portion 43c of the second terminal 43 are respectively located on two sides forming one corner of the circumscribed square IQ. Therefore, the dimension L4 corresponding to the height of the trapezoid is ½ of the dimension L1 of the boundary line 43c1. That is, even when the area of the lower surface of the mounting portion 43c of the second terminal 43 is increased, the area of the remaining portion (two triangular regions) protruding outward from the two sides forming one corner of the circumscribed square IQ is reduced as much as possible. Thus, it is possible to prevent an unnecessary increase in the mounting area when the electrochemical cell 40 with a terminal is surface-mounted on a circuit board.

  Furthermore, in the electrochemical cell 40 with a terminal described above, the lower surface of the mounting portion 43c of the second terminal 43 exists at one corner of the circumscribed square IQ, and the first terminal 42 is disposed at one corner adjacent to one corner of the circumscribed square IQ. A portion of the lower surface of the mounting portion 42c exists, and when the electrochemical cell 40 with terminals is viewed from below, the entire lower surface of the mounting portion 43c of the second terminal 43 is outward from the electrochemical cell 41. A part of the mounting part 42c of the first terminal 42 protrudes outward from the electrochemical cell 41 with an area that is comparable to the lower surface area of the mounting part 43c. That is, when the electrochemical cell 40 with a terminal is surface-mounted on a circuit board by reflow soldering, it is possible to suppress a soldering failure, for example, a phenomenon that the mounting portion 43c of the second terminal 43 is lifted, that is, a so-called Manhattan phenomenon.

  5A and 5B show a modification of the shape of the mounting portion 43c. The shape of the bottom surface of the mounting portion 43c shown in FIG. 5A is the same as the mounting portion 43c and the leg portion 43b. A trapezoid surrounded by two sides forming an angle θ of 105 degrees with the lower base of the same dimension L1 as the boundary line 43c1, the upper base of the dimension L5 larger than the lower base, and the lower base . Further, the shape of the lower surface of the mounting portion 43c shown in FIG. 5 (B) is the same as the bottom L3 of the boundary line 43c1 between the mounting portion 43c and the leg 43b, and above the size L5 larger than the bottom bottom. It forms a trapezoid surrounded by the bottom and the lower base and two sides forming an angle θ of 135 degrees. Even if the shape of the mounting portion 43c is changed to the mounting portion 43c shown in FIGS. 5A and 5B, the same effect as described above can be exhibited.

  4 (A) to 4 (D), 5 (A), and 5 (B), the bottom surface of the mounting portion 43c of the second terminal 43 indicates the area of the bottom surface by a diagonal line DL. The area of the remaining portion (two triangular regions) that protrudes outward from the two sides forming one corner of the circumscribed square IQ is “same” on both sides of the diagonal line DL. However, considering parts tolerance, assembly tolerance, deformation after assembly, etc., it is practically difficult to make "bisected" exactly what it means and "same" exactly what it means Therefore, “bisected” includes “substantially equally divided” as well as “substantially equally divided”, and “same” means “substantially the same” in addition to “exactly same”. Include as.

  4 (A) to 4 (D), 5 (A), and 5 (B), there are two corners on the leg 43b side as the shape of the lower surface of the mounting portion 43c of the second terminal 43. An “trapezoid” having an angle of “75 degrees”, “105 degrees”, or “135 degrees” is shown, but the “trapezoid” is a shape in which two outer corners of four corners are rounded. Alternatively, any shape can be used as long as the lower base and the upper base are not exactly parallel, that is, a shape that can be identified substantially as a trapezoid, and the same effect as described above can be exhibited. In addition, the “75 degrees”, “105 degrees”, or “135 degrees” changes according to the length relationship between the lower base and the upper base of the “trapezoid”, and the “trapezoid” is a trapezoid. These angles are not limited to various shapes that can be substantially identical.

  Further, in FIGS. 4A to 4D, 5A, and 5B, both ends of the boundary line 43c1 that forms the lower surface of the mounting portion 43c of the second terminal 43 are circumscribed square IQ. Although the dimension L4 corresponding to the height of the trapezoid is “1/2” of the dimension L1 of the boundary line 43c1 is shown. Considering tolerances, assembly tolerances, post-assembly deformation, etc., it is actually difficult to make “positions on two sides” exactly as they mean and “1/2” exactly as they mean. “Position on each of two sides” includes “substantially position on each of two sides” in addition to “position on each of two sides”, and “1/2” means “exactly 1 / In addition to “2”, “about 1/2” is included in the meaning.

  Further, in FIGS. 4A to 4D, 5A, and 5B, both ends of the boundary line 43c1 that forms the lower surface of the mounting portion 43c of the second terminal 43 are circumscribed square IQ. However, both ends of the boundary line 43c1 do not necessarily need to be "positioned on the two sides", for example, both ends of the boundary line 43c1. Are located slightly inside the two sides that form one corner of the circumscribed square IQ, and both the ends of the boundary line 43c1 are located slightly outside the two sides that form the corner of the circumscribed square IQ. Even if it is adopted, the same effect as described above can be exhibited.

  Further, in FIGS. 4A to 4D, 5A, and 5B, the dimension L4 corresponding to the height of the trapezoid is “1/2” of the dimension L1 of the boundary line 43c1. However, the dimension L4 is not necessarily “½” of the dimension L1 of the boundary line 43c1, for example, the dimension L4 is slightly smaller than ½ of the dimension L1 of the boundary line 43c1. Even if a small aspect or an aspect in which the dimension L3 is slightly larger than ½ of the dimension L1 of the boundary line 43c1 is adopted, the same effect as described above can be exhibited.

  Further, FIGS. 4A to 4D, 5A, and 5B show the second terminal 43 in which the width of the leg portion 43b is smaller than the width of the fixed portion 43a. However, even if the width of the leg portion 43b is the same as the width of the fixing portion 43a, conversely, the same effect as described above can be exhibited even if the width of the fixing portion 43a is the same as the width of the leg portion 43b.

[Fourth Embodiment]
FIGS. 6 (A) to 6 (D) show a terminal-attached electrochemical cell (fourth embodiment) to which the present invention is applied. The terminal-attached electrochemical cell 50 is a button-type or coin-type electrochemical cell. The cell 51 is configured by providing a first terminal 52 and a second terminal 53 for surface mounting. 6A, 6B, and 6D indicates the center of the electrochemical cell 51, and the two-dot chain line is a circumscribed square IQ that circumscribes the electrochemical cell 51. The dashed-dotted straight line indicates the diagonal line DL of the circumscribed square IQ.

  In FIG. 6 (A) to FIG. 6 (D), the terminal-attached electrochemical cell 50 is shown using the reference numerals in the 50th order to distinguish it from the terminal-attached electrochemical cell 20 (first embodiment). Since the structure excluding the second terminal 53 of the electrochemical cell with terminal 50 is the same as that of the electrochemical cell 20 with terminal (first embodiment), only the mode of the second terminal 53 will be described here. Subsequently, the effect of the electrochemical cell 50 with a terminal will be described, and subsequently, a modified example of the shape of the second terminal 53 will be described.

  The second terminal 53 is formed by bending a substantially rectangular metal plate made of nickel, stainless steel, nickel-iron alloy or the like at a predetermined position twice, and having a substantially rectangular fixing portion 53a; A rectangular leg portion 53b (53b1 indicates a boundary line with the fixing portion 53a) having a width smaller than that of the fixing portion 53a and bent at a right angle from the end edge of the fixing portion 53a, and an end portion of the leg portion 53b A triangular mounting portion 53c (53c1 indicates a boundary line with the leg portion 53b) that is bent at a right angle from the edge is continuously provided.

  The second terminal 53 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and a part of the lower surface of the fixing portion 53a is formed into a circular plane of the cell case 51a by a joining method such as laser welding, resistance welding, or ultrasonic welding. It is fixed. The leg portion 53b is a portion that secures a height corresponding to the thickness of the electrochemical cell 51 between the fixing portion 53a and the mounting portion 53c. When one surface in the thickness direction (circular plane of the cell cap 51b in the drawing) is surface-mounted facing the mounting surface of the circuit board (not shown), the mounting surface is connected to the pad of the circuit board. Yes.

  As can be seen from FIGS. 6B and 6D, the shape of the lower surface of the mounting portion 53c of the second terminal 53 forms an angle θ of 60 degrees with the base of the same dimension L1 as the boundary line 53c1. The boundary line 53c1 is surrounded by two sides, and the boundary line 53c1 forms a triangle (as shown in the drawing, a regular triangle, see the shaded area in FIG. 6B). The angle between the two corners is 60 degrees. The lower surface (triangular surface) of the mounting portion 53c is such that both ends of the boundary line 53c1 forming the lower surface are located on two sides forming one corner of the circumscribed square IQ, and the center and apex angle of the base of the triangle Is located on the diagonal line DL. Further, since the dimension L6 corresponding to the height of the triangle is larger than ½ of the dimension L1 of the boundary line 53c1, the vertex is located outside one corner of the circumscribed square IQ.

  In short, a part (one triangular region) of the lower surface (triangular surface) of the mounting portion 53c of the second terminal 53 does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the mounting portion The remaining portion (one V-shaped region) of the lower surface (triangular surface) of 53c protrudes outward from two sides forming one corner of the circumscribed square IQ. In addition, since the area of the lower surface (triangular surface) of the mounting portion 53c of the second terminal 53 is bisected by the diagonal line DL, the remaining portion that protrudes outward from the two sides forming one corner of the circumscribed square IQ. The area of (one V-shaped region) is the same on both sides of the diagonal line DL.

  In the electrochemical cell 50 with a terminal, the lower surface (rectangular surface) of the mounting portion 52c of the first terminal 52 and the lower surface (triangular surface) of the mounting portion 53c of the second terminal 53 are connected to the circuit board via a bonding material such as solder. By connecting to the pad, the surface of the electrochemical cell 51 in the thickness direction (the circular plane of the cell cap 51b in the drawing) is surface-mounted in a posture facing the mounting surface of the circuit board.

  In the electrochemical cell 50 with a terminal described above, the second terminal 53 is disposed in the direction of the diagonal line DL of the circumscribed square IQ, and the lower surface (triangular surface) of the mounting portion 53c of the second terminal 53 is provided. A part (one triangular region) does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the remaining portion (one V-shaped region) of the lower surface (triangular surface) of the mounting portion 53c is Projecting outward from the two sides forming one corner of the circumscribed square IQ. That is, since the area of the lower surface of the mounting portion 53c of the second terminal 53 can be increased to reduce the difference from the area of the lower surface of the mounting portion 52c of the first terminal 52, the electrochemical cell 50 with a terminal after surface mounting vibrates. Even when a load such as the above is applied, the lower surface of the mounting portion 53c of the second terminal 53 is restrained from being biased with a larger stress than the lower surface of the mounting portion 52c of the first terminal 52, and the lower surface of the mounting portion 53c is connected. Can be prevented from deteriorating.

  In the above-described electrochemical cell 50 with a terminal, the lower surface (triangular surface) of the mounting portion 53c of the second terminal 53 has a shape in which the area of the lower surface is divided into two equal parts by a diagonal line DL. The area of the remaining portion (one V-shaped region) protruding outward from the two sides forming one corner of the circumscribed square IQ is the same on both sides of the diagonal line DL. That is, even when the area of the lower surface of the mounting portion 53c of the second terminal 53 is increased, when a load such as vibration is applied to the electrochemical cell 50 with a terminal after surface mounting, the lower surface of the mounting portion 53c of the second terminal 53 Can be made uniform on both sides of the diagonal line DL to contribute to the prevention of the connection deterioration.

  Furthermore, in the above-described electrochemical cell 50 with a terminal, the shape of the lower surface of the mounting portion 53c of the second terminal 53 is the same as the boundary line 53c1 between the mounting portion 53c and the leg portion 53b, and the bottom side It is a triangle surrounded by a base and two sides forming an angle θ of 60 degrees, and the boundary line 53c1 is used as the base. That is, the angle of the two corners on the leg 53b side of the lower surface (triangular surface) of the mounting portion 53c of the second terminal 53 is 60 degrees, and the angle of the other corner is also 60 degrees. The stress generated on the lower surface of the mounting portion 53c of the second terminal 53 when a load such as vibration is applied to the electrochemical cell 50 with a terminal is suppressed from concentrating on the two corners on the leg portion 53b side, It can contribute to prevention of connection deterioration. On the other hand, in the conventional electrochemical cell 10 with a terminal shown in FIGS. 1A to 1C, the leg 13 b side of the lower surface (triangular surface) of the mounting portion 13 c of the second terminal 13. Since the angle of the two corners is 45 degrees and the angle of the other corner is 90 degrees, the stress generated on the lower surface of the mounting portion 13c is concentrated on the two corners on the leg portion 13b side, which is a small angle. Easy to do.

  Furthermore, in the above-described electrochemical cell 50 with a terminal, both ends of the boundary line 53c1 that forms the lower surface of the mounting portion 53c of the second terminal 53 are located on two sides that form one corner of the circumscribed square IQ, respectively. The dimension L6 corresponding to the height of the triangle is larger than ½ of the dimension L1 of the boundary line 53c1. That is, even when the area of the lower surface of the mounting portion 53c of the second terminal 53 is increased, if the dimension L6 is adjusted so as not to become extremely large, the protrusion protruding outward from the two sides forming one corner of the circumscribed square IQ. By reducing the area of the remaining portion (one V-shaped region) as much as possible, it is possible to prevent the mounting area when the electrochemical cell with terminal 50 is surface-mounted on the circuit board from being increased more than necessary.

  Furthermore, in the electrochemical cell 50 with a terminal described above, the lower surface of the mounting portion 53c of the second terminal 53 exists at one corner of the circumscribed square IQ, and the first terminal 52 is located at one corner adjacent to one corner of the circumscribed square IQ. A part of the lower surface of the mounting portion 52c is present, and when the electrochemical cell 50 with terminals is viewed from below, the entire lower surface of the mounting portion 53c of the second terminal 53 is outward from the electrochemical cell 51. A part of the mounting part 52c of the first terminal 52 protrudes outward from the electrochemical cell 51 with an area that is comparable to the lower surface area of the mounting part 53c. That is, when the electrochemical cell 50 with a terminal is surface-mounted on a circuit board by reflow soldering, it is possible to suppress a soldering failure, for example, a phenomenon that the mounting portion 53c of the second terminal 53 is lifted, that is, a so-called Manhattan phenomenon.

  6A to 6D, the lower surface of the mounting portion 53c of the second terminal 53 has a shape in which the area of the lower surface is “bisected” by a pair of diagonal lines DL. Although the area of the remaining portion (one V-shaped region) protruding outward from two sides forming one corner of the circumscribed square IQ is “same” on both sides of the diagonal line DL, the component tolerance is shown. Considering assembly tolerances and post-assembly deformation, etc., it is practically difficult to make "bisected" exactly what it means and "same" exactly as it is meant. In addition to “divided into two equal parts”, “substantially equally divided into two parts” is included in its meaning, and “same” includes “exactly the same” and “substantially the same” in its meaning.

  6A to 6D, a “triangle” in which the angle of two corners on the leg portion 53b side is “60 degrees” as the shape of the lower surface of the mounting portion 53c of the second terminal 53 is shown. As shown, the “triangle” is an equilateral triangle shown in the drawing, an isosceles triangle, a shape in which the angles of the two base angles are not exactly the same, and the apex angle is rounded. Any shape can be used as long as it is substantially the same as a triangle, and the same effect as described above can be exhibited. In addition, the “60 degrees” is based on the premise that the “triangle” is an equilateral triangle, but includes various shapes that can be substantially identical to the triangle. It is not limited to 60 degrees.

  Further, in FIGS. 6A to 6D, both ends of the boundary line 53c1 forming the lower surface of the mounting portion 53c of the second terminal 53 form one corner of the circumscribed square IQ. However, in consideration of component tolerance, assembly tolerance, deformation after assembly, etc., it is actually difficult to make “position on each of the two sides” exactly as it is meant. “Positions on one side” includes “substantially positions on two sides” in addition to “exact positions on two sides”.

  Further, in FIGS. 6A to 6D, both ends of the boundary line 53c1 forming the lower surface of the mounting portion 53c of the second terminal 53 form one corner of the circumscribed square IQ. However, both ends of the boundary line 53c1 do not necessarily have to be “positioned on two sides”, for example, two sides where both ends of the boundary line 53c1 form one corner of the circumscribed square IQ. The same effect as described above can be achieved even when an aspect that is located slightly inward from the inside or an aspect in which both ends of the boundary line 53c1 are located slightly outside the two sides that form a circumscribed square IQ corner. .

  Further, FIGS. 6A to 6D show the second terminal 53 in which the width of the leg portion 53b is smaller than the width of the fixed portion 53a, but the width of the leg portion 53b is fixed to the fixed portion. Even if the width of the fixed portion 53a is the same as the width of the leg portion 53b, the same effect as described above can be exhibited.

[Fifth Embodiment]
7 (A) to 7 (D) show a terminal-attached electrochemical cell (fifth embodiment) to which the present invention is applied. The terminal-attached electrochemical cell 60 is a button-type or coin-type electrochemical cell. The cell 61 is configured by providing a first terminal 62 and a second terminal 63 for surface mounting. 7A, 7B, and 7D indicates the center of the electrochemical cell 61, and the two-dot chain line is a circumscribed square IQ that circumscribes the electrochemical cell 61. The dashed-dotted straight line indicates the diagonal line DL of the circumscribed square IQ.

  7 (A) to 7 (D), the terminal-attached electrochemical cell 60 is shown using the number 60s to distinguish it from the terminal-attached electrochemical cell 20 (first embodiment). Since the structure excluding the second terminal 63 of the electrochemical cell 60 with terminal is the same as that of the electrochemical cell 20 with terminal (first embodiment), only the mode of the second terminal 63 will be described here. Subsequently, the effect of the electrochemical cell 60 with a terminal will be described, and subsequently, a modification of the shape of the second terminal 63 will be described.

  The second terminal 63 is formed by bending a substantially rectangular metal plate made of nickel, stainless steel, nickel-iron alloy or the like twice at different positions, and has a substantially rectangular fixing portion 63a. A rectangular leg portion 63b (63b1 indicates a boundary line with the fixing portion 63a) having a width smaller than that of the fixing portion 63a and bent at a right angle from the end edge of the fixing portion 63a, and an end of the leg portion 63b A rectangular mounting portion 63c (63c1 indicates a boundary line with the leg portion 63b) that continuously bends outward from the edge at a right angle is continuously provided.

  The second terminal 63 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and a part of the lower surface of the fixing portion 63a is formed into a circular plane of the cell case 61a by a joining method such as laser welding, resistance welding, or ultrasonic welding. It is fixed. The leg portion 63b is a portion that secures a height corresponding to the thickness of the electrochemical cell 61 between the fixing portion 63a and the mounting portion 63c. One surface in the thickness direction (circular plane of the cell cap 61b in the drawing) is a mounting surface that is connected to the pad of the circuit board when surface-mounted in a posture facing the mounting surface of the circuit board (not shown). Yes.

  As can be seen from FIGS. 7B and 7D, the shape of the lower surface of the mounting portion 63c of the second terminal 63 is smaller than the two long sides having a dimension L8 larger than the boundary line 63c1 and the long sides. A rectangle (see the shaded area in FIG. 7B) surrounded by two short sides of the dimension L7 and the boundary line 63c1 used as a part of one of the two long sides. The angle of the four corners is 90 degrees. The lower surface (rectangular surface) of the mounting portion 63c is such that both ends of the boundary line 63c1 forming the lower surface are located on two sides forming one corner of the circumscribed square IQ, and the center of the two long sides of the rectangle Is located on the diagonal line DL. Further, since the dimension L7 of the two short sides of the rectangle is ½ of the dimension L1 of the boundary line 63c1, the center of the outer long side is located at one corner of the circumscribed square IQ.

  In short, a part (one triangular area) of the lower surface (rectangular surface) of the mounting portion 63c of the second terminal 63 does not protrude outward from the two sides forming one corner of the circumscribed square IQ, and the mounting portion The remaining portion (two trapezoidal regions) of the lower surface (rectangular surface) of 63c protrudes outward from two sides forming one corner of the circumscribed square IQ. Further, since the lower surface (rectangular surface) of the mounting portion 63c of the second terminal 63 is divided into two equal parts by the diagonal line DL, the remaining portion that protrudes outward from two sides forming one corner of the circumscribed square IQ. The area of (two trapezoidal regions) is the same on both sides of the diagonal line DL.

  In the electrochemical cell 60 with terminals, the lower surface (rectangular surface) of the mounting portion 62c of the first terminal 62 and the lower surface (rectangular surface) of the mounting portion 63c of the second terminal 63 are connected to the circuit board via a bonding material such as solder. By connecting to the pad, the surface of the electrochemical cell 61 in the thickness direction (the circular plane of the cell cap 61b in the drawing) is surface-mounted in a posture facing the mounting surface of the circuit board.

  In the above-described electrochemical cell 60 with a terminal, the second terminal 63 is arranged in the direction of the diagonal line DL of the circumscribed square IQ, and the lower surface (rectangular surface) of the mounting portion 63c of the second terminal 63 is provided. A part (one triangular area) does not protrude outward from two sides forming one corner of the circumscribed square IQ, and the remaining part (two trapezoidal areas) of the lower surface (rectangular surface) of the mounting portion 63c Projecting outward from the two sides forming one corner of the circumscribed square IQ. That is, since the area of the lower surface of the mounting portion 62c of the first terminal 62 can be reduced by increasing the area of the lower surface of the mounting portion 23c of the second terminal 63, the electrochemical cell 60 with a terminal after surface mounting vibrates. Even when a load such as the above is applied, the lower surface of the mounting portion 63c of the second terminal 63 is prevented from being biased with a larger stress than the lower surface of the mounting portion 62c of the first terminal 62, and the lower surface of the mounting portion 63c is connected. Can be prevented from deteriorating.

  Further, in the above-described electrochemical cell 60 with a terminal, the lower surface (rectangular surface) of the mounting portion 63c of the second terminal 63 has a shape in which the area of the lower surface is divided into two equal parts by a diagonal line DL. The areas of the remaining portions (two trapezoidal regions) projecting outward from the two sides forming one corner of the circumscribed square IQ are the same on both sides of the diagonal line DL. That is, even when the area of the lower surface of the mounting portion 63c of the second terminal 63 is increased, when a load such as vibration is applied to the electrochemical cell 60 with a terminal after surface mounting, the lower surface of the mounting portion 63c of the second terminal 63. Can be made uniform on both sides of the diagonal line DL to contribute to the prevention of the connection deterioration.

  Furthermore, in the above-described electrochemical cell 60 with a terminal, the shape of the lower surface of the mounting portion 63c of the second terminal 63 is two in the dimension L8 which is larger than the boundary line 63c1 between the mounting portion 63c and the leg portion 63b. The rectangle is surrounded by a long side and two short sides having a dimension L7 smaller than the long side, and the boundary line 63c1 is used as a part of one of the two long sides. That is, the angle of the two corners on the leg 63b side of the lower surface (rectangular surface) of the mounting portion 63c of the second terminal 63 is 90 degrees, and the angles of the other two corners are also 90 degrees. The stress generated on the lower surface of the mounting portion 63c of the second terminal 63 when a load such as vibration is applied to the electrochemical cell 60 with a terminal is suppressed from concentrating on the two corners on the leg portion 63b side, and It can contribute to prevention of connection deterioration. On the other hand, in the conventional electrochemical cell 10 with a terminal shown in FIGS. 1A to 1C, the leg 13 b side of the lower surface (triangular surface) of the mounting portion 13 c of the second terminal 13. Since the angle of the two corners is 45 degrees and the angle of the other corner is 90 degrees, the stress generated on the lower surface of the mounting portion 13c is concentrated on the two corners on the leg portion 13b side, which is a small angle. Easy to do.

  Furthermore, in the above-described electrochemical cell 60 with a terminal, both ends of the boundary line 63c1 forming the lower surface of the mounting portion 63c of the second terminal 63 are respectively positioned on two sides forming one corner of the circumscribed square IQ. The dimension L7 of the two short sides of the rectangle is ½ of the dimension L1 of the boundary line 23c1. That is, even when the area of the lower surface of the mounting portion 63c of the second terminal 63 is increased, if the dimension L8 is adjusted so as not to become extremely large, the protrusion protruding outward from the two sides forming one corner of the circumscribed square IQ. By reducing the area of the remaining part (two trapezoidal regions) as much as possible, it is possible to prevent the mounting area when the electrochemical cell 60 with a terminal is surface-mounted on a circuit board from increasing more than necessary.

  Furthermore, in the electrochemical cell 60 with a terminal described above, the lower surface of the mounting portion 63c of the second terminal 63 exists at one corner of the circumscribed square IQ, and the first terminal 62 is located at one corner adjacent to the corner of the circumscribed square IQ. A part of the lower surface of the mounting portion 62c is present, and when the electrochemical cell 60 with terminals is viewed from below, the entire lower surface of the mounting portion 63c of the second terminal 63 is outward from the electrochemical cell 61. A part of the lower surface of the mounting portion 62c of the first terminal 62 protrudes outward from the electrochemical cell 61 with an area that is comparable to the lower surface area of the mounting portion 63c. That is, when the electrochemical cell 60 with a terminal is surface-mounted on a circuit board by reflow soldering, it is possible to suppress a soldering failure, for example, a phenomenon that the mounting portion 63c of the second terminal 63 is lifted, that is, a so-called Manhattan phenomenon.

  7A to 7D, the lower surface of the mounting portion 63c of the second terminal 63 has a shape in which the area of the lower surface is “bisected” by a pair of diagonal lines DL. Although the area of the remaining portions (two trapezoidal regions) projecting outward from the two sides forming one corner of the circumscribed square IQ is “same” on both sides of the diagonal line DL, Considering assembly tolerances and deformations after assembly, it is practically difficult to make bisect as it is or to make the same as it is. In addition to “bisected”, “substantially bisected” is included in its meaning, and “same” includes “exactly the same” and “substantially the same” in its meaning.

  7A to 7D show a “rectangle” in which the angles of all four corners are “90 degrees” as the shape of the lower surface of the mounting portion 63c of the second terminal 63. The “rectangle” is a shape in which the outer two corners of the four corners are rounded, or a shape in which the angles of the four corners of the rectangle are not exactly 90 degrees, that is, substantially the same as the rectangle. Any shape that can be identified with each other can be used as appropriate, and the same effects as described above can be exhibited. In addition, the “90 degrees” is based on the premise that the “rectangle” is an accurate rectangle, but includes various shapes that can be substantially identical to the rectangle. And it is not limited to 90 degrees.

  Further, in FIGS. 7A to 7D, both ends of the boundary line 63c1 forming the lower surface of the mounting portion 63c of the second terminal 63 form one corner of the circumscribed square IQ. In the embodiment, the dimension L7 of the two short sides of the rectangle is “½” of the dimension L1 of the boundary line 63c1, but the component tolerance, the assembly tolerance, the deformation after the assembly, etc. Since it is practically difficult to make “positions on two sides” exactly as they mean and to make “1/2” exactly as they mean, “positions on two sides” is “ In addition to “exactly located on each of the two sides”, “substantially located on each of the two sides” is included as the meaning, and “1/2” means “about 1/2” in addition to “exactly ½”. As a meaning.

  Further, in FIGS. 7A to 7D, both ends of the boundary line 63c1 forming the lower surface of the mounting portion 63c of the second terminal 63 form one corner of the circumscribed square IQ. However, the both ends of the boundary line 63c1 do not necessarily have to be “positioned on the two sides”, for example, two sides where the both ends of the boundary line 63c1 form one corner of the circumscribed square IQ. Even if a mode in which the both ends of the boundary line 63c1 are located slightly outside the two sides forming one corner of the circumscribed square IQ, etc. are adopted, the same effect as described above can be obtained. Can demonstrate.

  Further, FIGS. 7A to 7D show a mode in which the dimension L7 of the two short sides of the rectangle is “1/2” of the dimension L1 of the boundary line 63c1. The dimension L7 does not necessarily have to be “½” of the dimension L1 of the boundary line 63c1, for example, an aspect in which the dimension L7 is slightly smaller than ½ of the dimension L1 of the boundary line 63c1, or the dimension L7 is the boundary line Even if an aspect slightly larger than ½ of the dimension L1 of 63c1 is adopted, the same effect as described above can be exhibited.

  Further, FIGS. 7A to 7D show the second terminal 63 in which the width of the leg portion 63b is smaller than the width of the fixed portion 63a, but the width of the leg portion 63b is fixed to the fixed portion. Even if the width of the fixing portion 63a is the same as the width of the leg portion 63b, the same effect as described above can be exhibited.

  20, 30, 40, 50, 60 ... electrochemical cell with terminal, 21, 31, 41, 51, 61 ... electrochemical cell, 21a, 31a, 41a, 51a, 61a ... cell case, 21b, 31b, 41b, 51b , 61b ... cell cap, 22, 32, 42, 52, 62 ... first terminal, 22a, 32a, 42a, 52a, 62a ... fixed part, 22c, 32c, 42c, 52c, 62c ... mounting part, 23, 33, 43, 53, 63 ... second terminal, 23a, 33a, 43a, 53a, 63a ... fixed part, 23b, 33b, 43b, 53b, 63b ... leg part, 23c, 33c, 43c, 53c, 63c ... mounting part, IQ ... circumscribed square, DL ... circumscribed square diagonal line.

Claims (12)

A button-type or coin-type electrochemical cell in which a power generation element or a power storage element is sealed inside a cell case used as one of a positive electrode and a negative electrode and a cell cap used as the other; a fixing part and a mounting part; A first terminal fixedly attached to one of the cell case and the cell cap, a fixed portion, a height securing leg portion, and a mounting portion; A second terminal affixed to the other of the cell cap and the cell cap, and the electrochemical cell is surface-mounted in a posture in which one surface in the thickness direction faces the mounting surface of the circuit board. In the electrochemical cell with a terminal in which the lower surface of the mounting portion of one terminal and the lower surface of the mounting portion of the second terminal are mounting surfaces connected to the pads of the circuit board,
The second terminal is arranged in the direction of a diagonal line of a circumscribed square circumscribing the electrochemical cell, and a part of the lower surface of the mounting portion of the second terminal has two sides forming one corner of the circumscribed square And the remaining portion of the lower surface of the mounting portion protrudes outward from two sides forming one corner of the circumscribed square.
An electrochemical cell with a terminal characterized by the above. The lower surface of the mounting portion of the second terminal has a shape in which the area of the lower surface is bisected by the diagonal line, and the remaining portion protruding outward from two sides forming one corner of the circumscribed square. The area is the same on both sides of the diagonal line,
The electrochemical cell with a terminal according to claim 1. The shape of the lower surface of the mounting portion of the second terminal is surrounded by two long sides having the same dimensions as the boundary line between the mounting portion and the leg portions, and two short sides having dimensions smaller than the long sides. It is rectangular and the boundary is used as one of the two long sides,
The electrochemical cell with a terminal according to claim 2. Both ends of the boundary line forming the lower surface of the mounting portion of the second terminal are respectively located on two sides forming one corner of the circumscribed square, and the dimensions of the two short sides of the rectangle are the boundary line Is half the size of
The terminal-attached electrochemical cell according to claim 3. The shape of the lower surface of the mounting portion of the second terminal is a U shape surrounded by one line segment having the same dimension as the boundary line between the mounting portion and the leg portion and one curved line, and A boundary line is used as the line segment,
The electrochemical cell with a terminal according to claim 2. Both ends of the boundary line forming the lower surface of the mounting portion of the second terminal are respectively located on two sides forming one corner of the circumscribed square, and the dimension corresponding to the height of the U-shape is the boundary line It is half the size,
The terminal-attached electrochemical cell according to claim 5. The shape of the lower surface of the mounting portion of the second terminal is a trapezoid surrounded by a lower base having the same dimension as a boundary line between the mounting portion and the leg, an upper base having a different dimension from the lower base, and two sides. And the boundary line is used as the lower base,
The electrochemical cell with a terminal according to claim 2. Both ends of the boundary line forming the lower surface of the mounting portion of the second terminal are respectively located on two sides forming one corner of the circumscribed square, and the dimension corresponding to the height of the trapezoid is the dimension of the boundary line Half of
The terminal-attached electrochemical cell according to claim 7. The shape of the lower surface of the mounting portion of the second terminal is a triangle surrounded by a base and two sides having the same dimensions as a boundary line between the mounting portion and the leg, and the boundary line is the base side. Used as
The electrochemical cell with a terminal according to claim 2. Both ends of the boundary line forming the lower surface of the mounting portion of the second terminal are respectively located on two sides forming one corner of the circumscribed square, and the dimension corresponding to the height of the triangle is the dimension of the boundary line Greater than 1/2 of
The terminal-attached electrochemical cell according to claim 9. The shape of the lower surface of the mounting portion of the second terminal is surrounded by two long sides having a size larger than the boundary line between the mounting portion and the leg portion and two short sides having a size smaller than the long side. And the boundary line is used as a part of one of the two long sides,
The electrochemical cell with a terminal according to claim 2. Both ends of the boundary line forming the lower surface of the mounting portion of the second terminal are respectively located on two sides forming one corner of the circumscribed square, and the dimensions of the two short sides of the rectangle are the boundary line Is half the size of
The electrochemical cell with a terminal according to claim 11.

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