JP3576484B2 - Resin sealing molding equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a resin-sealing molding apparatus that fills a molten resin so as to cover components of a product , and seals one surface of the product with the cured resin.
[0002]
[Prior art]
In products such as portable electronic devices, the use environment is not constant, and it is required to be smaller, thinner and lighter because of the movement, and at the same time, it is required to have a dust proof, drip proof structure or drop resistance and impact resistance. . In order to satisfy these requirements, the structure of the outer package of the product is an important factor. FIG. 12 is an example of a product, showing a configuration example of a battery pack used as a power source of a portable electronic device, in which a secondary battery 80 and a circuit board 84 including a battery protection circuit and the like are housed in an exterior body. Thus, it has responded to the demand as a power source for portable electronic devices.
[0003]
The exterior body of this battery pack is constituted by a pack case including a lower case 82 and an upper case 83. As shown in FIG. 12A, a circuit board 84 constituting a battery protection circuit, input / output terminals, a connection plate, and the like are arranged in a lower case 82, and further, 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.
[0004]
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 periphery of the lower case 82 is fitted into the recess 83 a formed on the periphery of the upper case 83, and the tip of the protrusion 82 a And ultrasonic welding between the bottom of the recess 83a. With this joining structure, the molten resin is not exposed to the outside.
[0005]
[Problems to be solved by the invention]
However, the structure of joining the divided cases is indispensable in the configuration of the conventional exterior body. In the above-described conventional example, the thickness of the side peripheral surfaces of the two cases 82 and 83 is required to join the upper case 83 to the lower case 82. However, there is a problem that the volume and weight of the pack case, that is, the battery pack, increase.
[0006]
Also, the pack case is a hard case, and the upper case 83 needs to be joined to the lower case 82 to expose the input / output terminals to the outside. The structure was difficult to perform, and the structure was easily damaged by falling.
[0007]
An object of the present invention is to provide a resin-sealing molding apparatus suitable for realizing a dust-proof and drip-proof structure as well as miniaturization and weight reduction by sealing one surface of a product with a resin.
[0008]
[Means for Solving the Problems]
The present invention for achieving the above object is a resin sealing molding apparatus for filling a resin on one surface of a product and sealing the one surface of the product with a resin. a core gate and sprue are formed leading to the space, the the core and an elastic member for biasing in a direction away from the product container, is brought into contact with the nozzle tip to the sprue, the product container containing the said product A resin injection nozzle that presses the core against the bias of the elastic member and fills the filling space with a resin from a nozzle through a sprue and a gate , wherein the filling space is formed between one surface of the product and the inner surface of the core. It is characterized in that the product container and the core are formed in a split shape with the gate position as an abutting surface .
[0009]
According to the resin sealing and molding apparatus and accommodates a product in the product housing body is advanced resin injection nozzle core is pressed into the cavity against the biasing force of the elastic member, and the product container and the core since a mold having is closed, when the resin is injected from the resin injection nozzle, the resin is filled into the filling space. When accommodating the one surface of the resin sealing products in the product container so as to face the charging space one surface of the product is resin-sealed.
[0010]
In addition, since the product container and the core are configured in a split mold with the gate position as the abutting surface, it is easy to put the product in and out of the mold, and it is possible to cope with the undercut generated in the gate part. it can. Further, since the space between the product container and the core is closed by the advance operation of the resin injection nozzle, the product can be easily stored and taken out.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate 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.
[0014]
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 constituted a secondary battery 1 configured as a flat lithium ion secondary battery and a battery protection circuit for protecting the secondary battery 1 from overcharge, overdischarge, and the like. The circuit board 9 and the circuit board 9 are integrally combined to form an intermediate completed product 50 as shown in FIG. 2, and this intermediate completed product 50 is accommodated in the pack case 7 as shown in FIG. Is sealed in a resin to form a battery pack without impairing the form of the secondary battery 1.
[0015]
FIG. 1 is an exploded view of the intermediate completed product 50. On the side of the sealing portion of the secondary battery 1, a connection plate 11 joined to the positive electrode terminal 25 of the secondary battery 1 and on the secondary battery 1 are shown. A spacer 12 which is provided to provide a seating surface of the circuit board 9, and a circuit board 9 which constitutes a battery protection circuit and has a plus terminal 4, a minus terminal 5, and a temperature detection terminal 6 are provided. A lead plate 10 extending from the bottom surface to the side surface of the battery can 31 constituting the negative electrode is provided.
[0016]
A base 11b of an L-shaped connecting plate 11 is joined to a positive electrode terminal 25 of the secondary battery 1, a base 10b of a lead plate 10 is joined to a bottom surface of the battery can 31, and a lead 10a Extends along the side surface of the battery can 31 toward the sealing portion.
[0017]
Further, a spacer 12 is attached to the sealing portion side of the secondary battery 1 as shown in FIG. The spacer 12 is positioned and fitted on the secondary battery 1, and the insulation between the spacer 12 and the battery can 31, which is the negative electrode, is enhanced. Further, the lead portion 11a of the connection plate 11 and the lead portion 10a of the lead plate 10 are joined on 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 the secondary battery 1 only at the height obtained by adding the thickness of the board and the thickness of the spacer 12. 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.
[0018]
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, and a connection plate conductor pattern 15 for connecting the connection plate 11 and a lead plate conductor pattern 16 for connecting the lead plate 10. ing. The circuit patterns formed on both sides are connected by through holes 30 at important points. The lead portion 11a of the connection plate 11 is passed through the lead through hole 20 formed in the circuit board 9, and the lead portion 11a is bent onto 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.
[0019]
As shown in FIG. 4A, the positive terminal 4 is formed on the positive terminal conductor pattern 4a formed on the surface side of the circuit board 9, the negative terminal 5 is formed on the negative terminal conductor pattern 5a, and the temperature detection terminal is formed. The temperature detection terminal 6 is joined on the 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. In addition, it is also possible to apply gold plating to each conductor pattern and use the conductor pattern as it is without joining a plate material as a terminal.
[0020]
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. As shown in FIG. 5 (a), the intermediate completed product 50 is provided with a plus terminal window 4c, a minus terminal window 5c, and a temperature detection terminal window 6c on the upper surface 13, and a bottom portion 14 as shown in FIG. 5 (c). As shown in FIG. 5B, the intermediate completed product 50 is housed in the pack case 7 by sealing the bottom portion 14 with a resin molding device 60 described below. Sealed.
[0021]
6 to 9 sequentially show each step of resin sealing by the resin sealing molding apparatus 60, and show a mold portion in two views orthogonal to each other in FIGS.
[0022]
In FIG. 6, a product container (hereinafter referred to as a cavity) 62 and a core 63 constituting a molding die are formed in a split mold structure to enable the intermediate finished product 50 to be taken in and out, and to be sprued by a sprue 67 at a gate portion. It is designed to cope with the undercut that occurs. A cavity 62a is formed in the cavity 62, and the inner surface of the core 63 is a resin molding surface in contact with the resin filling space 63a . The core 63 has a gate 66 connected to the filling space 63a and a gate 66 connected to the gate 66. A sprue 67 is formed. The core 63 is urged by a spring (elastic member) 64 in a direction away from the cavity 62. As shown in the figure, the cavity 62 is opened, and the intermediate completed product 50 covered with the pack case 7, that is, the product before resin sealing of the secondary battery is inserted into the cavity 62a with its open end facing the core 63.
[0023]
Next, as shown in FIG. 7, the cavity 62 and the core 63 are closed, and the resin injection nozzle 65 is advanced toward the cavity 62, thereby pressing the core 63 against the bias of the spring 64. As shown in FIG. 8, the core 63 is in close contact with the cavity 62, and the resin molding surface formed on the core 63 is located on the open end of the pack case 7, so that the resin 70 is injected from the resin injection nozzle 65 into the sprue 67. Upon discharge, 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 with this configuration, the strength is supplemented, and the size of the battery pack can be reduced.
[0024]
After curing the filled resin 70, as shown in FIG. 9, the cavity 62 and the core 63 are opened, and the resin injection nozzle 65 is retracted, so that the resin-encapsulated battery pack can be taken out. As shown in FIG. 10A, an unnecessary portion 70a formed by the gate 66 and the sprue 67 remains in the molded resin 70. By cutting the unnecessary portion 70a, as shown in FIG. Then, a battery pack in which the intermediate completed product 50 is covered with the pack case 7 and the resin 70 is completed.
[0025]
The resin sealing molding device 60 described above is configured to seal the bottom of the opened pack case 7 with resin, but the intermediate completed product 50 is inserted into a case having an upper surface as an open end, and a terminal is inserted. An opening may be formed in a portion and the upper surface may be sealed with resin. This can be implemented by forming a protrusion in contact with the terminal portion in the filling space 63a of the core 63.
[0026]
As shown in FIG. 11, a cavity 62a formed in the cavity 62 is formed to have a size such that a space is formed around the intermediate completed product 50, and the intermediate completed product 50 is suspended at a plurality of locations on the inner wall of the cavity 62a. By providing the pin 75 for supporting the state, the resin 70 injected from the resin injection nozzle 65 is filled around the intermediate completed product 50 as shown in the figure, and the entire surface can be sealed with resin. Also in this case, the opening is formed in the terminal portion as described above.
[0027]
The resin used for the resin encapsulation described above is preferably a polyamide-based or polyurethane-based hot melt. 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]
【The invention's effect】
As described above, according to the present invention, in a resin-sealing molding apparatus for sealing one surface of a product with a resin, the product can be easily stored and taken out.
[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, and FIG.
FIG. 3 is a perspective view showing a completed state of the battery pack.
FIGS. 4A and 4B are plan views showing the configuration of the circuit board, in which FIG.
5 (a) is a top view, FIG. 5 (b) is a side view, and FIG. 5 (c) is a bottom view showing the configuration of the pack case.
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 same.
FIG. 8 is a sectional view showing a state of a second step of the above.
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 resin encapsulation molding, and FIG. 10B is a cross-sectional view illustrating a completed state of a 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)
Reference Signs List 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

Claims (3)

A resin sealing molding device for filling a resin on one side of the product and sealing the one side of the product with a resin,
A product container for storing the product, a core having a gate and a sprue connected to a resin filling space, an elastic member for urging the core in a direction away from the product container , and a nozzle tip against the sprue. is contact, the press the core against the urging of the elastic member, and a resin injection nozzle for filling the resin into the filling space through the sprue and the gate from the nozzle into the product container containing the said product,
The filling space is formed between one surface of the product and an inner surface of the core,
A resin sealing molding apparatus , wherein the product container and the core are configured in a split mold having a gate position as an abutting surface . The resin sealing molding apparatus according to claim 1, wherein the product is a product before resin sealing of a secondary battery. The pre-resin-sealed product of the secondary battery has a case that covers the components of the product, and a surface not covered by the case corresponds to one surface of the product that is resin-sealed. Item 3. The resin molding apparatus according to Item 2.

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