JP2002166447A - Resin sealing molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin sealing molding apparatus which resin-seals an optional surface of a product to form an exterior body. SOLUTION: A semi-finished article 50 produced by assembling a plurality of components integrally is housed in a pack case 7 with its bottom surface opened, the case 7 is arranged in the cavity 62a of a cavity 62, a mold is closed, a resin injection nozzle 65 is advanced, a core 63 is pushes to the cavity 62 against the bias of a spring 64, a resin is packed in a filling space 63a, and the open bottom surface of the pack case 7 is resin-sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-sealing molding apparatus for filling a resin melted so as to cover components of a product and forming an exterior body in which the product is sealed with the cured resin. Things.

[0002]

2. Description of the Related Art In a product such as a portable electronic device, the use environment is not constant, and it is required to be reduced in size, thickness and weight due to movement, and at the same time, it is required to have a dust-proof, drip-proof structure or drop-proof, shock-resistant. Is required. In order to satisfy these requirements, the structure of the outer package of the product is an important factor. FIG.
Is an example of a product, and shows a configuration example of a battery pack used as a power source of a portable electronic device.
And a circuit board 84 including a battery protection circuit and the like are housed in an exterior body to meet a demand as a power source of a portable electronic device.

[0003] The exterior body of this battery pack is composed of a pack case composed of a lower case 82 and an upper case 83. As shown in FIG. 12A, a circuit board 84 constituting a battery protection circuit, an input / output terminal, a connection plate, and the like are arranged in a lower case 82, and, as shown in FIG. The secondary battery 80 configured as a lithium ion secondary battery is arranged, and the secondary battery 80 is joined to the connection plate. Next, as shown in FIG. 12C, a double-sided tape 85 is attached to the battery 80, and the upper case 83 is joined to the lower case 82 to complete the battery pack.

The lower case 82 and the upper case 83 are joined at their peripheral edges by ultrasonic joining or the like. In the case of ultrasonic bonding, as shown in FIG. 13, the protrusion 82 a formed on the peripheral edge of the lower case 82 is fitted into the recess 83 a formed on the peripheral edge of the upper case 83, and the protrusion 82 a
Is ultrasonically welded between the tip of the groove and the bottom of the recess 83a. With this joint structure, the molten resin is not exposed to the outside.

[0005]

However, in the structure of the conventional exterior body, a structure for joining the divided cases is indispensable. In the above conventional example, the upper case 8 is connected to the lower case 82.
The thickness of the side peripheral surfaces of both cases 82 and 83 is required in order to join 3, and there is a problem that the volume and weight of the pack case, that is, the battery pack, increase.

The pack case is a hard case, and it is necessary to join the upper case 83 to the lower case 82 and expose the input / output terminals to the outside. It was difficult to construct a structure, and the structure was easily damaged by falling.

An object of the present invention is to provide a resin-sealing molding apparatus for realizing a dust-proof and drip-proof structure as well as miniaturization and weight reduction by completely covering the internal components of a product with a thin exterior body. It is in.

[0008]

According to the present invention, there is provided a resin-sealing molding apparatus for filling a required surface of a product with a resin and sealing the product with a resin. A cavity, a core formed with a gate connected to a space filled with resin, an elastic member for urging the core in a direction away from the cavity, and a nozzle tip contacting the gate to accommodate a product in the cavity. A resin injection nozzle that presses the core against the cavity against the bias of the elastic member and fills the filling space with the resin from the nozzle through the gate.

According to the above resin encapsulation / molding apparatus, when the product is accommodated in the cavity and the resin injection nozzle is advanced, the core is pressed by the cavity against the bias of the elastic member and the mold is closed. When the resin is injected from the resin injection nozzle, the resin is filled in the filling space. When the required surface of the product to be sealed with resin is accommodated in the cavity so as to face the filling space, the product is sealed with resin. Further, the space between the cavity and the core is closed by the advance operation of the resin injection nozzle, so that the product can be easily stored and taken out.

In the above configuration, the cavity and the core can be configured as a split mold having a gate position as an abutting surface, so that a product can be easily taken in and out of the mold.
It is possible to cope with an undercut generated in the gate portion.

Further, when the product is accommodated in a case covering the required surface and a filling space is formed on a surface not covered by the case, an arbitrary surface of the product can be sealed with a resin, and the case and the product can be sealed. Since the resin is filled also in the gap between them, it is possible to reduce the size and seal of the product by reducing the thickness of the case.

When the product is suspended in the cavity and the core at a predetermined distance from the outer surface of the product and is filled with resin by providing a filling space on the entire surface of the product, the entire surface of the product can be sealed with resin. it can.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.

The embodiment described below shows an example in which the present invention is applied to a pack case for sealing the interior of a battery pack (product). As shown in FIG. 1, the battery pack includes a secondary battery 1 configured as a flat lithium ion secondary battery.
And a circuit board 9 which constitutes a battery protection circuit for protecting the secondary battery 1 from overcharge, overdischarge, etc., to form an intermediate completed product 50 as shown in FIG. The product 50 is housed in the pack case 7 as shown in FIG. 3, and the open end of the pack case 7 is sealed with a resin to form a battery pack without impairing the form of the secondary battery 1.

FIG. 1 is an exploded view of the intermediate completed product 50. A connection plate 11 joined to a positive electrode terminal 25 of the secondary battery 1 is provided on the side of a sealing portion of the secondary battery 1; A spacer 12 disposed on 1 to provide a seating surface for the circuit board 9;
A circuit board 9, which forms a battery protection circuit and has a positive terminal 4, a negative terminal 5, and a temperature detection terminal 6, is provided, and extends from the bottom surface to the side surface of the battery can 31 constituting the negative electrode of the secondary battery 1. A lead plate 10 is provided.

A base 11b of an L-shaped connecting plate 11 is joined to a positive electrode terminal 25 of the secondary battery 1, and a base 10b of a lead plate 10 is joined to a bottom surface of a battery can 31. The lead portion 10a extends toward the sealing portion along the side surface of the battery can 31.

Further, a spacer 12 is attached to the sealing portion side of the secondary battery 1 as shown in FIG. Spacer 1
Numeral 2 is positioned and fitted on the secondary battery 1 to enhance the insulation between the secondary battery 1 and the battery can 31, which is the negative electrode. Also, the connection plate 11
And the lead portion 10a of the lead plate 10 are joined onto the circuit board 9 through the spacer 12 and the circuit board 9. Since the electronic components mounted on the sealing portion side of the circuit board 9 are accommodated in the opening of the spacer 12, the circuit board 9 has a height of the sum of the thickness of the board and the thickness of the spacer 12 alone. It becomes a state of being stacked on top, and an increase in height due to the provision of the battery protection circuit is suppressed.

FIG. 4 shows a circuit pattern formed on both the front and back surfaces of the circuit board 9, on which a battery protection circuit and input / output terminals are formed. As shown in FIG. 4 (b), a battery protection circuit is formed on the back side (spacer 12 side) of the circuit board 9, and as shown in FIG. 4 (a), the positive terminal conductor pattern 4a is formed on the front side. A negative terminal conductor pattern 5a and a temperature detection terminal conductor pattern 6a,
Connection plate conductor pattern 15 for connecting connection plate 11
In addition, a lead plate conductor pattern 16 for connecting the lead plate 10 is formed. The circuit patterns formed on both sides are connected at important points by through holes 30. The lead through hole 20 formed in the circuit board 9
Through the lead portion 11a of the connection plate 11, and
a is bent over the connection plate conductor pattern 15 and soldered. Further, the lead portion 10a of the lead plate 10 is bent over the lead plate conductor pattern 16 and soldered.
The circuit board 9 is fixed on the spacer 12 by soldering the connection plate 11 and the lead plate 10.

As shown in FIG. 4A, the plus terminal 4 is formed on the plus terminal conductor pattern 4a formed on the front side of the circuit board 9, and the minus terminal 5 is formed on the minus terminal conductor pattern 5a. The temperature detection terminal 6 is joined onto the detection terminal conductor pattern 6a. By using a copper-nickel alloy plate or a clad material of the copper-nickel alloy and stainless steel, these terminals are excellent in conductivity, bonding property, and corrosion resistance. Also, each conductor pattern can be plated with gold and used as a terminal without joining a plate material as a terminal.

By attaching the circuit board 9 to the secondary battery 1 as described above, an intermediate completed product 50 is formed as shown in FIG. This intermediate product 50 is shown in FIG.
As shown in FIG. 5, a plus terminal window 4c, a minus terminal window 5c, and a temperature detection terminal window 6c are provided on the upper surface 13.
As shown in FIG. 5B, the bottom 14 is housed in the pack case 7 having the bottom 14 opened as shown in FIG. 5C, and the bottom 14 is resin-sealed by a resin-sealing molding device 60 described below. The intermediate completed product 50 is sealed in the pack case 7.

FIGS. 6 to 9 show the respective steps of resin sealing by the resin sealing molding apparatus 60 in order.
(B) shows a cross section of the mold portion in two orthogonal directions.

In FIG. 6, the cavity 62 and the core 63 constituting the molding die are formed in a split mold structure so that the intermediate finished product 50 can be taken in and out, and the undercut caused by the sprue 67 in the gate portion can be accommodated. I can do it. A cavity 62 a is formed in the cavity 62, a resin filling space 63 a in the core 63, a gate 66 connected to the filling space 63 a,
Are formed. The core 63 is urged by a spring (elastic member) 64 in a direction away from the cavity 62. As shown, the cavity 62 is opened and the intermediate product 50 covered with the pack case 7 is placed in the cavity 62 with its open end facing the core 63.
Insert into a.

Next, as shown in FIG.
Then, the core 63 is closed and the resin injection nozzle 65 is advanced toward the cavity 62, whereby the core 63 is pressed against the cavity 62 against the bias of the spring 64. FIG.
As shown in FIG. 7, the core 63 is in close contact with the cavity 62 and the filling space 63 a formed in the core 63 is located on the open end of the pack case 7. The resin 70 is filled into the filling space 63a through the gate 66. The filling of the resin 70 seals the open end of the pack case 7 with the resin. Further, since the filled resin 70 also enters the gap between the pack case 7 and the intermediate completed product 50, the pack case 7 and the intermediate completed product 50 are integrated, and the pack case 7 is formed by a thin resin molded product. Even if it composes, strength is supplemented,
The battery pack can be downsized.

After the filled resin 70 is cured, the cavity 62 and the core 63 are opened and the resin injection nozzle 65 is retracted as shown in FIG. Molded resin 70
As shown in FIG. 10 (a), the unnecessary portion 70a formed by the gate 66 and the sprue 67 remains as shown in FIG. 10 (a). Intermediate finished product 5 by resin 70
Thus, a battery pack coated with 0 is completed.

The resin sealing and molding apparatus 60 described above is configured to seal the opened bottom portion of the pack case 7 with resin, but inserts the intermediate completed product 50 into a case having an open end on the upper surface. Alternatively, an opening may be formed in the terminal portion to seal the upper surface with resin. This is core 6
The third filling space 63a can be implemented by forming a protruding portion in contact with the terminal portion.

Further, as shown in FIG.
2, the volume of the intermediate completed product 50 is
Is formed in such a size that a gap is formed around the periphery thereof, and pins 75 for supporting the intermediate completed product 50 in a suspended state are provided at a plurality of positions on the inner wall of the cavity 62a, so that the resin 70 injected from the resin injection nozzle 65 As shown in the figure, the resin is filled around the intermediate completed product 50, and the entire surface can be sealed with resin. Also in this case, the opening is formed in the terminal portion as described above.

As the resin used in the resin encapsulation described above, a polyamide-based or polyurethane-based hot melt is suitable. In addition, by adjusting the hardness of the resin to be low when cured, an effect of absorbing shock is obtained, and the shock resistance against shocks such as dropping on the battery pack is improved, which is suitable as a power supply for portable electronic devices. It becomes something.

[0028]

As described above, according to the present invention, an arbitrary outer surface of a product can be sealed with a resin, and the outer body can be made thin, so that the size of the product can be reduced. . Further, since the product can be covered in a sealed structure, it can be configured in a dustproof and drip-proof structure, which is suitable for application to portable electronic devices and the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of an intermediate completed product according to an embodiment.

FIG. 2A is a plan view showing the configuration of an intermediate completed product.
(B) End side view.

FIG. 3 is a perspective view showing a completed state of the battery pack.

FIGS. 4A and 4B show the configuration of a circuit board, FIG.
Is a plan view of the back side.

5A is a top view showing the configuration of the pack case, FIG.
(B) is a side view, (c) is a bottom view.

FIG. 6 is a cross-sectional view showing the configuration of the resin encapsulation molding apparatus in cross sections in two orthogonal directions (a) and (b), showing a state of a first step.

FIG. 7 is a sectional view showing a state of a second step of the above.

FIG. 8 is a sectional view showing a state of a second step of the same.

FIG. 9 is a sectional view showing a state of a third step of the above.

10A is a cross-sectional view illustrating a completed state of the resin sealing molding, and FIG. 10B is a cross-sectional view illustrating a completed state of the battery pack.

FIG. 11 is a cross-sectional view showing a configuration in which the entire surface of the battery pack is resin-sealed.

FIG. 12 is a perspective view showing a configuration and an assembling order of a battery pack having a conventional configuration in the order of (a), (b) and (c).

FIG. 13 is a partial cross-sectional view showing a joined state of a conventional pack case.

[Explanation of symbols]

 7 Pack case 50 Intermediate finished product (product) 60 Resin sealing molding device 62 Cavity 62a Cavity 63 Core 63a Filling space 64 Spring (elastic member) 65 Resin injection nozzle 66 Gate 70 Resin

Continued on the front page F term (reference) 4F202 AD02 AH37 CA11 CB01 CB17 CK06 CK54 4F206 AD02 AH37 JA07 JB17 JL02 JN14 JQ55 JQ81 5H040 AA01 AA32 AA33 AY08 JJ01 JJ10

Claims (4)

[Claims] 1. A resin molding apparatus for filling a required surface of a product with a resin and sealing the product with a resin, wherein a core having a cavity for accommodating the product and a gate connected to a space filled with the resin is formed. And an elastic member for urging the core in a direction away from the cavity, and a nozzle tip contacting the gate to press the core against the urging of the elastic member against the cavity containing the product in the cavity. And
A resin injection nozzle for filling the filling space with a resin from a nozzle through a gate. 2. The resin-sealing molding apparatus according to claim 1, wherein the cavity and the core are configured as a split mold having a gate position as an abutting surface. 3. The resin sealing and molding apparatus according to claim 1, wherein the product is accommodated in a case covering a required surface thereof, and a filling space is formed at a position corresponding to a surface not covered by the case. . 4. The resin sealing and molding apparatus according to claim 1, wherein the product is supported in a suspended state in the cavity and the core with a predetermined distance from the outer surface thereof, and a filling space is provided on the entire surface of the product. .