JP2007179912A - Electrode connecting structure of button battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode connecting structure of a button battery, capable of reducing a cost while securing reliable contact of the battery with an electrode. <P>SOLUTION: This electrode connecting structure of the button battery 3 is equipped with a circuit board 5 having a planar pattern surface 13, and a pressing force applying means 11 to press the button battery against the pattern surface when the button battery 9 is set. The pattern surface has the setting area of the button battery, and a protruding element 17 is provided in the setting area. The protruding element is composed of a plurality of projecting parts made of solder 19 deposited on the pattern surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a button battery electrode connection structure and the like.

  In a conventional button battery electrode connection structure, both a positive electrode terminal and a negative electrode terminal are generally prepared for connection to a button battery. Each of these terminals has been realized, for example, in such a manner that a plate-like or block-like metal member or conductive resin member is separately provided for a circuit.

  However, in such a conventional electrode connection structure, two terminals are always required, that is, if an example is given, two metal pieces need to be provided for the circuit. In addition, it is not necessary to simply form and install each terminal, and it is necessary to manage from the stage of formation and installation so as to ensure reliable conduction. Therefore, since two terminals are always required, there has been a problem of an increase in cost due to an increase in the number of parts and management effort.

  On the other hand, Patent Document 1 discloses a power switch structure that uses a circuit board pattern as one electrode.

However, in this structure, when an inclusion such as insulating dust adheres to the upper surface of the pattern, which is a mere plane, there is a risk that contact failure will occur immediately. The circuit board is generally subjected to a resist treatment for the purpose of preventing contact with other parts. For this reason, the battery cannot properly contact the pattern due to the thickness of the resist around the pattern, which may cause a problem of poor contact.
JP-A-8-185843

  The present invention has been made in view of the above, and it is an object of the present invention to provide a button battery electrode connection structure and the like that can achieve cost reduction while ensuring reliable contact between the battery and the electrode. To do.

  In order to solve the above-described problems, the electrode connection structure for a button battery according to the present invention includes a circuit board having a planar pattern surface, and presses the button battery toward the pattern surface when the button battery is set. The pattern surface has a set region of the button battery, and the set region is provided with a projecting element.

A resist layer may be provided around the pattern surface of the circuit board, and the protruding element may be provided such that a top portion thereof is higher than the resist layer.
The protruding elements may be a plurality of convex portions provided at positions separated from each other, and each of the convex portions may be solder stacked on the pattern surface.

  Preferably, the pressing force applying means is made of a metal plate that is supported by the circuit board and presses the button battery by elastic force, the metal plate forms one electrode, and the protruding element is another One electrode is constituted.

  A data logger according to the present invention for solving the same problem includes the button battery electrode connection structure according to the present invention described above, and stores the button battery set in the set area of the pattern surface and the circuit board. And a case.

  Furthermore, the manufacturing method of the electrode connection structure of the button battery according to the present invention for solving the same problem provides a circuit board having a planar pattern surface and a resist layer provided therearound, and the circuit board. In the step of applying solder to the mounting area of the circuit component to mount the circuit component, solder is also deposited on the button battery set region on the pattern surface, and in the reflow step for the circuit component, the button An electrode for the electrode is formed.

  According to the above-described present invention, it is possible to reduce the cost while ensuring reliable contact between the battery and the electrode.

  Further, when the top of the protruding element is made higher than the resist layer, the contact between the button cell and the protruding element is not hindered by the resist layer, and conduction can be ensured reliably.

  In addition, when the projecting elements are made of solder on the pattern surface, it is not necessary to add a dedicated process only for forming the button battery electrodes, avoiding complicated manufacturing methods and producing A highly specific embodiment can be provided.

  When the pressing force applying means is made of a metal plate, in addition to the function of pressing the button battery against the circuit board, this means that also functions as an electrode terminal for the button battery is realized with a simple and low-cost configuration. be able to.

  The other features of the present invention and the operational effects thereof will be described in more detail with reference to the accompanying drawings.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in the case where the present invention is implemented as a button battery electrode connection structure in a data logger will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 1 is a perspective view showing a configuration of a data logger relating to the present embodiment. The data logger 1 includes a circuit board 5, which is a component of the button battery electrode connection structure 3, a case 7, and a button battery 9.

  The case 7 includes an upper case 7a and a lower case 7b. The upper case 7a and the lower case 7b have a ceiling wall and a bottom wall that are rectangular in plan view, and side walls that rise from four sides of the ceiling wall and the bottom wall. With such a configuration, when the upper case 7a and the lower case 7b are combined, a storage chamber is formed inside them.

  The circuit board 5 is provided in the storage chamber of the case 7. The fixing mode of the circuit board 5 is not particularly limited, but is fixed by screws in the present embodiment. On the circuit board 5, first, circuit parts including sensor parts and other parts suitable for measurement items for collecting data as a data logger are mounted. Examples of measurement items include temperature, humidity, impact, speed, illuminance, solar radiation, flow rate, and consumption. Furthermore, the circuit board 5 is mounted with a button battery 9 and a pressing force applying means 11 which is a component of the electrode connection structure 3 of the button battery.

  The pressing force applying means 11 is made of a metal plate supported on the circuit board 5. The metal plate also functions as one electrode terminal for the button battery 9 in addition to the function as the pressing force applying means 11 that presses the button battery 9 against the circuit board 5 by elastic force. As shown in FIGS. 2 and 3, the leg portion 11 a of the metal plate constituting the pressing force applying means 11 is inserted into the through hole 5 a of the circuit board 5, and is fixed by solder on the back surface of the circuit board 5. ing.

  As shown in FIGS. 2 and 3A, the metal plate constituting the pressing force applying means 11 is a substantially M-shaped member when viewed from the side, and the convex portion at the center faces the circuit board 5 side. Are arranged as follows. Accordingly, as shown in FIG. 3B, when the button battery 9 is set between the pressing force applying means 11 and the circuit board 5, the metal plate of the pressing force applying means 11 follows the button battery 9. As a reaction, the button battery 9 is given an elastic force of a metal plate, and the button battery 9 is urged toward the circuit board 5 as a reaction.

  As shown in FIGS. 2 and 4, the circuit board 5 is provided with a pattern surface 13 corresponding to the circuit. The pattern surface 13 is formed in a planar shape and is composed of a conductive thin film formed on the surface of the circuit board 5.

  The processing and processing on the surface side of the circuit board 5 including the pattern surface 13 may be performed in a known manner, for example, as follows. First, a conductive thin film is formed on the surface of the circuit board 5, and portions other than those necessary as the pattern surface 13 are removed by etching or the like. Next, a resist layer 15 is formed around the pattern surface 13 made of the remaining conductive thin film.

  The pattern surface 13 includes a set region 13b of the button battery 9 as an electrode portion in addition to the circuit conduction path 13a. And the protrusion element 17 is provided in the upper surface of the set area | region 13b of a button battery.

  In the present embodiment, the projecting elements 17 are a plurality of (five examples shown) convex portions provided at positions separated from each other, and each convex portion is constituted by the solder 19 placed on the pattern surface 13. Has been. The solder 19 of the protruding element 17 functions as one electrode (positive electrode) for the button battery 9 while the metal plate of the pressing force applying means 11 functions as another electrode (negative electrode).

  Further, as shown in FIG. 4, the convex portion made of the solder 19 is formed such that the top portion H is higher than the upper surface R of the resist layer 15.

  Next, a manufacturing method relating to such a data logger 1, in particular, an electrode connection structure 3 of the button battery will be described. First, a circuit board 5 having a planar pattern surface 13 and a resist layer 15 provided therearound is prepared. About the formation aspect of these pattern surfaces 13 and the resist layer 15, it is as having illustrated above.

  Subsequently, in order to mount the circuit component on the circuit board 5, solder is applied to the mounting region of the corresponding circuit component. In this solder application step, solder 19 (cream solder) is also applied to the button battery set region 13 b of the circuit board 5. And the reflow process with respect to a circuit component is implemented, and the projection element 17 which consists of solder 19 is formed as an electrode for the button battery 9 with joining of a circuit component.

  According to the present embodiment as described above, first, as an electrode connection structure on the circuit board 5 side of the button battery 9, there is no need to separately provide a terminal made of a plate-like or block-like metal member, etc. It is possible to avoid an increase in cost due to an increase in the number of parts and labor of management.

  Furthermore, in the pattern surface 13 of the circuit board 5, the protruding elements 17 provided in the button battery set region 13b are constituted by a plurality of convex portions provided at positions separated from each other. In contrast, the contact between the button battery 9 and the electrode can be reliably ensured. That is, in the present invention, since it is not a planar electrode, it is assumed that inclusions such as dust are received between the convex portions and the convex portions, or that the inclusions are located between the convex portions and the button cell 9. In addition, since a plurality of convex portions are formed, at least one convex portion is surely brought into contact with the button battery 9, and conduction is ensured.

  Furthermore, in the button battery set region 13 b on the circuit board 5, when the resist layer 15 is provided around the pattern surface 13, the convex portion made of the solder 19 has the top H of the resist layer 15. It is formed so as to be higher than the upper surface R. For this reason, even if the button battery 9 is larger than the set region 13b, the resist layer 15 does not hinder the contact between the button battery 9 and the protruding element 17, and the conduction is ensured. Secured. In addition, there is an advantage that inclusions such as dust are less likely to stay on top of each convex portion.

  Further, since each convex portion of the projecting element 17 is composed of the solder 19 piled on the pattern surface 13, in the step of applying solder to the circuit component mounting region, it is also soldered to the set region 13b. 19 and an electrode made of solder 19 can be formed together in a reflow process for circuit components. For this reason, it is not compulsory to add a dedicated process only for forming the electrode of the button cell 9, avoiding complication of the manufacturing method, and providing an embodiment with high productivity.

  Further, the pressing force applying means 11 functions as one electrode terminal for the button battery 9 in addition to the function of pressing the button battery 9 against the circuit board 5 by an elastic force. Then, since it is comprised from a metal plate, for example, compared with the case where conductive resin etc. are used, a pressing force provision means is realizable with a simple and low-cost structure.

  Although the contents of the present invention have been specifically described with reference to the preferred embodiments, various modifications can be made by those skilled in the art based on the basic technical idea and teachings of the present invention. It is self-explanatory.

It is a perspective view which shows the structure of the data logger regarding embodiment of this invention. It is a perspective view which shows the structure of the electrode connection structure of the button battery which concerns on this Embodiment. It is a side view which shows the state before and behind the setting of a button battery regarding the electrode connection structure of the button battery which concerns on this Embodiment. It is a figure which shows the set area | region vicinity of the button battery of a circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Data logger 3 Button battery electrode connection structure 5 Circuit board 7 Case 9 Button battery 11 Pressing force provision means 13 Pattern surface 13b Button battery set area 15 Resist layer 17 Projection element 19 Solder

Claims (6)

A circuit board having a planar pattern surface;
A pressing force applying means for pressing the button battery toward the pattern surface when the button battery is set,
The pattern surface has a set region of the button battery, and the set region is provided with a projecting element.
Button battery electrode connection structure. A resist layer is provided around the pattern surface of the circuit board,
2. The button battery electrode connection structure according to claim 1, wherein the protruding element is provided such that a top portion thereof is higher than the resist layer.   3. The button battery according to claim 1, wherein the protruding elements are a plurality of convex portions provided at positions spaced apart from each other, and each of the convex portions is solder deposited on the pattern surface. Electrode connection structure. The pressing force applying means is a metal plate that is supported by the circuit board and presses the button battery by elastic force,
The metal plate constitutes one electrode, and the protruding element constitutes another electrode;
The electrode connection structure for a button battery according to any one of claims 1 to 3. A data logger comprising the button battery electrode connection structure according to any one of claims 1 to 4,
The button battery set in the set area of the pattern surface;
A case for housing the circuit board;
Data logger. Prepare a circuit board having a planar pattern surface and a resist layer provided around it,
In the step of applying solder to the mounting region of the circuit component to mount the circuit component on the circuit board, the solder is also deposited on the button battery set region on the pattern surface,
Forming an electrode for the button electrode in a reflow process for the circuit component;
A manufacturing method of an electrode connection structure of a button battery.

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