JP2008153269A - Surface mount square storage cell - Google Patents

Abstract

The present invention relates to a storage cell for use in portable devices and the like, which solves the problem of a large mounting area loss and difficult to increase in size and capacity, and is a surface mounting rectangular storage cell that is highly efficient in mounting area and can be increased in size and capacity. The purpose is to provide.
A rectangular element, rectangular metal plates 4a and 4b disposed above and below the element, and a rectangular element which is disposed so as to surround the element and is compressed and sealed through the metal plates 4a and 4b. It comprises a sealing member 5, a U-shaped holder 6 for compressing and holding the metal plates 4a and 4b from above and below, and a pair of positive and negative terminal plates 7 and 8 joined to the metal plates 4a and 4b. In the state where the stepped portions 7a and 8a are exposed on the outer surface, the battery cell 1 is covered with the exterior resin 9 in a square shape, and the stepped portions 7a and 8a are bent to provide a pair of positive and negative terminals on the mounting surface. Therefore, it is possible to reduce the loss of the mounting area and realize a small size and a large capacity.
[Selection] Figure 1

Description

  The present invention relates to a surface-mounting rectangular electricity storage cell having a rectangular external shape in pursuit of mounting area efficiency among surface-mounting coin-type electricity storage cells used in various electronic devices.

  2 (a) and 2 (b) are a plan view and a front view showing the structure of this type of conventional surface-mount coin-type energy storage cell. In FIG. 2, 10 is an energy storage cell such as a secondary battery or a capacitor. , 11 is a negative electrode terminal connected to the negative electrode of the electricity storage cell 10, and 12 is a positive electrode terminal similarly connected to the positive electrode. Reference numeral 13 denotes solder plating, and reference numeral 14 denotes a terminal crushing portion applied for improving solderability.

  The conventional surface-mount coin-type energy storage cell configured in this way maintains the same mounting strength on the substrate even when the side-surface solder plating of the positive and negative terminals is eliminated in reflowable batteries or capacitors. It was possible to make it possible.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2002-170551 A

  However, in the conventional surface mount coin-type storage cell, the storage cell 10 such as a secondary battery or a capacitor is circular, and the negative electrode terminal 11 and the positive electrode terminal 12 connected to the storage cell 10 include the storage cell 10. Therefore, since it requires a large mounting area for the size of the element (not shown) accommodated in the storage cell 10, it is used for small devices such as portable devices. In such a case, there is a problem that it is difficult to meet the demand for a small size and large capacity.

  Further, in order to solve such a problem, it is conceivable to make the storage cell 10 square, but in the case of making it square, it becomes difficult to crimp and connect the case constituting the storage cell 10 and the upper lid, There is also a problem in that the sealing performance varies because the caulking connection at the corner cannot be made uniform.

  The present invention solves such conventional problems, and provides a surface-mounting rectangular storage cell capable of reducing the size and capacity, eliminating the loss of the mounting area, and exhibiting excellent reliability. It is intended.

  In order to solve the above problems, the present invention provides a rectangular element, a rectangular metal plate disposed above and below the element, and disposed so as to surround the element, and is compressed through the metal plate. Surface mounting composed of a rectangular sealing member for sealing, a U-shaped holder disposed so as to compress and hold the metal plate from above and below, and a pair of positive and negative terminal plates joined to the metal plate In the rectangular storage cell for use, a step portion is provided by bending in a stepwise manner in a direction away from the metal plate except for a joint portion between the pair of positive and negative terminal plates and the metal plate, and the step portion is exposed to the outer surface. By covering the storage cell in a square shape with an insulating exterior resin, and bending the stepped portion exposed from the exterior resin along the peripheral surface of the exterior resin, a pair of positive and negative terminals is provided on the bottom surface portion serving as the mounting surface. Each was arranged It is those of the adult.

  As described above, the surface-mounting rectangular electricity storage cell according to the present invention reduces the loss of the mounting area by making the electricity storage cell including the element square, and covers the electricity storage cell with the exterior resin. A configuration in which a pair of positive and negative terminal plates are bent along the resin makes it possible to dispose a large-area element in an extremely small mounting area, thereby realizing a small size and a large capacity. The effect is obtained. In addition to the sealing performance of the storage cell, sealing with an exterior resin is also performed, so that the effect of obtaining extremely high sealing performance is also obtained.

(Embodiment)
Hereinafter, the invention described in the entire claims of the present invention will be described by using embodiments.

  1A to 1C are a conceptual plan view, a front cross-sectional view, and a bottom conceptual view showing the configuration of a surface-mounted rectangular storage cell according to an embodiment of the present invention. Indicates a storage cell, and this storage cell 1 is square by arranging a pair of positive and negative polarizable electrodes 2a, 2b facing each other through an insulating separator 3 formed in the same square. A pair of metal plates 4a and 4b formed in a rectangular shape in a state in which the element is impregnated with a driving electrolyte solution (not shown) are arranged vertically, and a rectangular insulating property is provided so as to surround the element. And the pair of metal plates 4a and 4b are opposed and fitted in a pair so as to be compressed and held from above and below by a U-shaped holder 6 made of resin. Configured to compress and seal It is intended.

  7 and 8 are a positive terminal plate and a negative terminal plate joined to the pair of metal plates 4a and 4b, respectively, and 7a and 8a are portions other than a joint portion of the positive and negative pair of terminal plates 7 and 8 with the metal plates 4a and 4b. Stepped portions provided by bending stepwise in a direction away from the metal plates 4a and 4b, 9 is an insulating exterior resin that covers the storage cell 1 with the stepped portions 7a and 8a exposed on the outer surface, The pair of positive and negative terminals 7a, 8a are bent along the peripheral surface of the exterior resin 9 so that the pair of positive and negative terminals are arranged on the bottom surface portion serving as the mounting surface. In this way, a rectangular electricity storage cell compatible with surface mounting is formed.

  The polarizable electrodes 2a and 2b are prepared by mixing activated carbon powder, carbon black as a conductivity-imparting agent, polytetrafluoroethylene as a binder, and kneading thoroughly with a kneader to produce a paste. It is formed by molding into a square of the size and drying it.

  The pair of metal plates 4a and 4b are formed using an aluminum material or a stainless material.

  As the insulating sealing member 6, PPS with glass fiber, liquid crystal polymer, PEEK material (polyether ether ketone), or butyl rubber is suitable among thermoplastic resins, and if elasticity is required. For butyl rubber, PPS with glass fiber, liquid crystal polymer, PEEK material is required for moldability, PEEK material for higher heat resistance, and so on. More preferably, the butyl rubber is a non-halogen butyl rubber obtained by vulcanizing a resin using an alkylphenol resin and adding carbon black and silica as a reinforcing agent.

  In addition, a thermosetting resin is suitable as the insulating exterior resin 9, and in the present embodiment, an epoxy resin is used. When covering the storage cell 1 with the exterior resin 9, Since a part of the pair of metal plates 4a and 4b and the pair of positive and negative terminal plates 7 and 8 of the storage cell 1 arranged in an injection mold (not shown) are held in pressure contact with slide pins (not shown), the mold After the molding, the exterior resin 9 is formed with a plurality of holes 9a in which part of the pair of metal plates 4a and 4b and a pair of positive and negative terminal plates 7 and 8 are exposed on the trace of the slide pin. Is.

  The pair of positive and negative terminal plates 7 and 8 are made of aluminum or stainless steel, and have a surface roughness (Ra) of 0. 0 for the purpose of improving adhesion with the exterior resin 9. A surface roughening treatment of 05 μm or more is performed, and tin plating treatments 7b and 8b are performed on a portion to be mounted and soldered on a substrate (not shown).

  As described above, the surface-mounting rectangular storage cell according to the present embodiment reduces the mounting area loss by making the storage cell 1 including the element square, and covers the storage cell 1 with the exterior resin 9. In addition, the configuration in which the pair of positive and negative terminal plates 7 and 8 are bent along the exterior resin 9 makes it possible to dispose a large area element in a very small mounting area. Even if an element exhibiting a capacity is used, the mounting area is almost less than 50%, and it is possible to achieve a special effect that a small and large capacity can be realized.

  Further, the sealing member 5 is compressed by compressing the pair of metal plates 4 a and 4 b from above and below by the pair of holders 6, and in addition to the structure in which the storage cell 1 is sealed, sealing with the exterior resin 9 is also performed. Therefore, an exceptional effect that an extremely high sealing performance can be obtained is also achieved.

  Further, the stepped portions 7a and 8a are provided in the pair of positive and negative terminal plates 7 and 8, and the stepped portions 7a and 8a are exposed from the exterior resin 9, so that the metal plates 4a and 4b of the terminal plates 7 and 8 are provided. Even when the weld mark appears to be floating at the joint portion, the weld mark is covered with the exterior resin 9, so that it does not protrude from the exterior resin 9, and there is no possibility of a short circuit when mounting the board. The special effect of being able to do it is also produced.

  In the present embodiment, the electric double layer capacitor is described as an example of the electric storage cell. However, the present invention is not limited to this, and the electric storage cell uses a secondary battery, an electrochemical capacitor, or the like. It may be present, and the same effect can be obtained.

  The surface-mounting rectangular storage cell according to the present invention has an effect of reducing the mounting area and reducing the size and increasing the capacity and realizing high reliability, and particularly requires miniaturization and high-density mounting. It is useful as a field for portable devices.

(A) The plane conceptual diagram which showed the structure of the square-shaped electrical storage cell for surface mounting by one embodiment of this invention, (b) The front sectional drawing, (c) The bottom conceptual diagram (A) The top view which showed the structure of the conventional coin-type electrical storage cell for surface mounting, (b) The front view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric storage cell 2a, 2b Polarized electrode 3 Separator 4a, 4b Metal plate 5 Sealing member 6 Holder 7 Positive terminal plate 7a, 8a Step part 7b, 8b Tin plating process 8 Negative terminal plate 9 Exterior resin 9a Hole

Claims (2)

A square element arranged so that a pair of positive and negative electrodes formed in a square face each other through an insulating separator also formed in a square, and a square metal plate arranged in a pair above and below the element, A rectangular insulating sealing member that is disposed so as to surround the element and that is sealed by being compressed through the pair of metal plates, and the pair of metal plates is compressed and held from above and below. A pair of positive and negative terminal plates in a surface-mounting rectangular electricity storage cell comprising a pair of resin U-shaped holders disposed opposite to each other and a pair of positive and negative terminal plates joined to the pair of metal plates, respectively. A step is formed by bending the part other than the joint with the metal plate in a stepwise direction away from the metal plate, and the power storage cell is squarely covered with an insulating exterior resin in a state where the step is exposed on the outer surface. And this exterior By bending along a step portion which is exposed to the outside through the fat on the peripheral surface of the exterior resin, for surface mounting rectangular storage cell having as a pair of positive and negative terminals are people disposed respectively on the bottom portion serving as a mounting surface. The rectangular battery for surface mounting according to claim 1, wherein the exterior resin is provided with a plurality of holes through which a part of the pair of metal plates and the pair of positive and negative terminal plates are respectively exposed.

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