CN201112463Y

CN201112463Y - Electric connection structure for button battery

Info

Publication number: CN201112463Y
Application number: CNU200720195767XU
Authority: CN
Inventors: 邱全成; 刘小杰
Original assignee: Inventec Corp
Current assignee: Inventec Corp
Priority date: 2007-10-26
Filing date: 2007-10-26
Publication date: 2008-09-10
Anticipated expiration: 2017-10-26

Abstract

The utility model discloses an electrical connection structure of button batteries, which can solve the problems that the effect of the button battery electrical connection is poor, it is difficult to apply tin on pad, the applied tin is non-uniform, and excessive tin welding materials are consumed by technical means of improving the shape of the pad, thereby achieving the technical effects of improving the compactness between the battery and the battery fastener, simplifying the pad tinning procedure and saving the tin welding material.

Description

The electric connection structure of button cell

Technical field

The utility model is the electric connection structure about a kind of battery, particularly about a kind of electric connection structure of button cell.

Background technology

In recent years, because semiconductor industry is flourish, under advanced person's manufacture of semiconductor cooperates, the volume of electronic product is more and more littler, make corresponding electrical storage device also to adopt the master that is designed to of button cell, its design normally comes button cell is fixed and electrically connected with the battery fastener, electric connection place of general battery fastener, mainly be responsible for providing positive pole to electrically connect with button cell, negative pole as for button cell is electrical, need then that (Printed Circuit Board, PCB) pad on (PAD) comes conducting, finishes whole electric power loop by being in direct contact with printed circuit board (PCB).

See also Fig. 1, Fig. 1 is the electric connection structure profile of button cell under ideal state.In desirable electric connection state, on printed circuit board (PCB) 10 (comprising encapsulant layer 11, copper foil layer 12 and solder mask 13), remove solder mask 13 by etching technique, its copper foil layer 12 is exposed, this zone of exposing claims pad 14 again, will explain after a while relevant for pad 14; Welding one layer height is slightly larger than the soldering-tin layer 15 of solder mask 13 on pad 14, and connect effect in order to produce excellent electrical property, must allow soldering-tin layer 15 surfaces very smooth, this soldering-tin layer 15 is first electrical contact 16 that button cell 20 contacts with printed circuit board (PCB) 10, so button battery cathode 21 can reach good electric connection with first electrical contact, 16 upper surfaces.

Printed circuit board (PCB) 10 electrically connects with battery fastener 30 fixing formation, and form an accommodation space between battery fastener 30 and printed circuit board (PCB) 10, except can ccontaining button cell 20, fixing button cell 20 also simultaneously, by second electrical contact 31 on the battery fastener 30, can form electric connection with the positive pole 22 of button cell 20, can finish whole electric power loop.

Yet because the restriction of production technology, actual soldering-tin layer 15 also is not easy to reach height and evenness in the perfect condition, in order to improve these problems, has two kinds of known technologies at present and generally is used for forming soldering-tin layer 15, and first method is spray tin technology; Second method is the manual soldering technology.

Spray tin technology please refer to shown in Figure 2, and Fig. 2 is the electric connection structure profile of spray tin technology, omits battery fastener 30 among the figure partly.This technology is for the tin operation being sprayed on pad 14 surfaces, making copper foil layer 12 tops can form fixedly soldering-tin layer 15 of a layer height; This technology can make the surface of soldering-tin layer 15 comparatively smooth, and can finish the contact area in big zone; But the soldering-tin layer 15 that spray tin technology is produced is easily because of highly not enough, cause button cell 20 and soldering-tin layer 15 between contact-making surface have the space, produce the bad problem of electric connection effect.

The manual soldering technology please refer to shown in Figure 3, and Fig. 3 is the electric connection structure profile of manual soldering technology.This technology is for pad 14 being carried out the scolding tin operation with manual type, making copper foil layer 12 tops can increase one deck soldering-tin layer 15; The height that this technology can guarantee soldering-tin layer 15 is enough, makes the electric connection of the button battery cathode 21 and first electrical contact 16, can not produce the bad problem of effect that electrically connects; But, owing to adopt the manual type operation, the height of its soldering-tin layer 15 is difficult to control, blocked up soldering-tin layer 15 not only can increase the cost of scolding tin material, more can cause battery fastener 30 when fixing button cell 20, produce excessive pressure and make battery fastener 30 bendings among Fig. 3, make that button cell 20 is difficult to put into and take out.

The front is mentioned, pad 14 is in order to weld the soldering-tin layer 15 that a layer height is slightly larger than solder mask 13, the shape of the general pad of using always 14 sees also Fig. 4, Fig. 4 is the circular pad vertical view, the pad 14 that a circle is arranged in the middle of the button cell lay down location 40 on printed circuit board (PCB) 10, by the soldering-tin layer 15 among welding one deck such as Fig. 3, in order to the button battery cathode 21 of contact as the button cell among Fig. 3 20, yet the pad 14 that uses this shape to make, because areal extent is bigger, so the scolding tin material that needs also with increase, produce the problem that expends unnecessary scolding tin material.

In sum, prior art has existed always since the midium or long term that button cell electrically connects that effect is bad as can be known, tin is difficult for and uneven problem on the pad, even expend the problem of unnecessary scolding tin material, and be necessary to propose improved technological means therefore in fact, solve this problem.

The utility model content

Button cell electrically connects that effect is bad because prior art exists, tin is difficult for and uneven problem on the pad, even expends the problem of unnecessary scolding tin material, and the utility model discloses a kind of electric connection structure of button cell.

The utility model provides a kind of electric connection structure of button cell, wherein comprises: printed circuit board (PCB), grid shape soldering-tin layer and battery fastener.Be formed with the grid shape pad in grid shape zone on the printed circuit board (PCB), grid shape zone is composed in series by equally spaced several grid; Grid shape soldering-tin layer is that the scolding tin material of burn-oning on several grid on the surface in grid shape zone forms, and the scolding tin material can form the soldering-tin layer above printed circuit board (PCB) on several grid, makes grid shape soldering-tin layer be able to the electrical utmost point that closely contact connects button cell; The battery fastener is fixed on the printed circuit board (PCB), and and grid shape soldering-tin layer between form accommodation space, in order to hold button cell and can closely contact electrical another utmost point of button cell.

The disclosed structure of the utility model as above, and the difference between the prior art is that the utility model passes through the improvement of bond pad shapes, cooperates the Reflow Soldering technology to produce the soldering-tin layer that electrically connects with button battery cathode.By above-mentioned technological means, the utility model can be reached tightness that strengthens battery and battery fastener and the technology effect of saving the scolding tin material.

Description of drawings

Fig. 1 is the electric connection structure profile of standard button cell.

Fig. 2 is the electric connection structure profile of utilization spray tin button cell that technology produces.

Fig. 3 is the electric connection structure profile that utilizes manual soldering button cell that technology produces.

Fig. 4 is the circular pad vertical view.

Fig. 5 is a grid shape pad vertical view of the present utility model.

Fig. 6 is the electric connection structure profile of the utility model button cell.

Embodiment

Below will cooperate graphic and embodiment describes execution mode of the present utility model in detail, thus to the utility model how the application technology means implementation procedure that solves technical problem and reach the technology effect can fully understand and implement according to this.

Generally speaking, the pad 14 of known bond pad shapes in Fig. 4 signal, because the areal extent of pad 14 is bigger, so the scolding tin material that needs also with increase, therefore, the utility model proposes a kind of electric connection structure of button cell, improvement by pad 14 shapes, cooperate the Reflow Soldering technology produce with the electrical utmost point of button cell (for example: the soldering-tin layer of Dian Xinglianjieing negative pole), described Reflow Soldering technology is a known technology, in order to the height of control soldering-tin layer,, do not give unnecessary details at this about the detailed way of Reflow Soldering technology.

Below cooperate Fig. 5 and Fig. 6 to carry out following explanation with by way of example, please consult Fig. 5 earlier, Fig. 5 is a grid shape pad vertical view of the present utility model, comprises: printed circuit board (PCB) 10, button cell lay down location 40 and grid shape pad 50.Wherein, grid shape pad 50 is to remove solder mask 13 by etching technique to be formed on the printed circuit board (PCB) 10, grid shape zone in the grid shape pad 50 is composed in series (for example: with vertical grid several equally spaced parallel gate are connected) by several grid, the electrical utmost point that the position in its grid shape zone can be positioned at button cell as schematically shown in Figure 5 (for example: the center of scope negative pole), and its grid shape zone be shaped as circle, quadrangle or leg-of-mutton geometric figure, and area can be less than the electrical utmost point of button cell (for example: area negative pole); Button cell lay down location 40, in order on printed circuit board (PCB) 10, to place the place of button cell, as schematically shown in Figure 5, can see grid shape pad 50 by nine parallel and equally spaced grid formed, and can connect with vertical grid in the centre, form the shape of a grid shape pad 50, the material of this grid shape pad 50 can be selected from the combination of materials of copper, silver, gold, nickel and tin, compare with known pad 14 shapes among Fig. 4, areal extent is less, so can save the scolding tin material.

See also Fig. 6, Fig. 6 is the electric connection structure profile of the utility model button cell, comprises: printed circuit board (PCB) 10, copper foil layer 12, solder mask 13, button cell 20, button battery cathode 21, button cell positive pole 22, battery fastener 30, grid shape pad 50 and grid shape soldering-tin layer 51.Wherein, printed circuit board (PCB) 10 has copper foil layer 12 and solder mask 13, remove solder mask 13 by etching technique, make copper foil layer 12 expose the grid shape pad 50 that forms grid shape zone, and on grid shape pad 50, weld the grid shape soldering-tin layer 51 that one deck is higher than solder mask 13 with the Reflow Soldering technology, make grid shape soldering-tin layer 51 (for example: button battery cathode 21) be able to the electrical utmost point that closely contact connects button cell, described etching technique with material (for example: solder mask 13) with chemical reaction or physical shock effect and the technology that removes is, because etching technique is known technology, do not give unnecessary details so do not remake at this; Battery fastener 30 can by the welding or screw on printed circuit board (PCB) 10, more comprise at least one electrical contact in order to contact button cell 20, and between grid shape soldering-tin layer 51, form accommodation space, (for example: button cell positive pole 22) in order to electrical another utmost point of holding button cell 20 and can closely contacting button cell 20.

When button cell 20 places above-mentioned accommodation space as schematically shown in Figure 6, because grid shape soldering-tin layer 51 is above printed circuit board (PCB) 10, so (for example: button battery cathode 21), electrical another utmost point that makes button cell 20 (for example: button cell positive pole 22) closely contacted battery fastener 30 and produce excellent electrical property and connect for an electrical utmost point of the contact that can make progress button cell 20.

In sum, difference between the utility model and the prior art is the technological means by the bond pad shapes improvement as can be known, a technological means can cooperate the Reflow Soldering technology to produce the electric connection structure with grid shape soldering-tin layer thus, solve that the existing button cell of prior art electrically connects that effect is bad, tin is difficult for and uneven problem on the pad, even expend the problem of unnecessary scolding tin material, and then reach the tightness that strengthens battery and battery fastener, simplify the technology effect of tin program on the pad and saving scolding tin material.

Though the disclosed execution mode of the utility model as above, only described content is not the scope of patent protection in order to direct this creation of qualification.Have in the technical field under any the utility model and know the knowledgeable usually, do not breaking away under this prerequisite of creating disclosed spirit and scope, can do a little change in form and on the details what implement.Scope of patent protection of the present utility model, still must with appended claim the person of being defined be as the criterion.

Claims

1, a kind of electric connection structure of button cell is characterized in that, wherein comprises:

One printed circuit board (PCB) is formed with the grid shape pad in a grid shape zone, and this grid shape zone is composed in series by a plurality of grid;

One grid shape soldering-tin layer, be that the scolding tin material of burn-oning on those grid on the surface in this grid shape zone forms, the scolding tin material can form the soldering-tin layer above this printed circuit board (PCB) on those grid, make this grid shape soldering-tin layer be able to the electrical utmost point that closely contact connects this button cell; And

One battery fastener is fixed on this printed circuit board (PCB), and and this grid shape soldering-tin layer between form an accommodation space, in order to hold this button cell and can closely contact electrical another utmost point of this button cell.

2, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein this grid shape zone is with etching technique the solder mask of this printed circuit board (PCB) to be removed to form.

3, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein those grid are arranged in equally spaced mode, and forms this grid shape pad with vertical grid those grid of connecting.

4, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein formed soldering-tin layer height is contour on those grid.

5, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein this grid shape zone be shaped as circle, quadrangle or leg-of-mutton geometric figure, and area is less than the area of an electrical utmost point of this button cell.

6, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein this grid shape zone is positioned at the center of scope of an electrical utmost point of this button cell.

7, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein the material of this grid shape pad is selected by copper, silver, gold, nickel and tin.

8, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein this grid shape soldering-tin layer utilizes the Reflow Soldering technology to finish.

9, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein this battery fastener is fixed on this battery fastener on this printed circuit board (PCB) by welding or screw.

10, the electric connection structure of button cell as claimed in claim 1 is characterized in that, wherein this battery fastener also comprises at least one electrical contact in order to this button cell of contact.