JP6950796B2 - Battery module manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a battery module.

In recent years, there has been a technique for miniaturizing a product and simplifying a manufacturing process by incorporating an electronic component or the like into a resin molded product by insert molding.

However, in the process of performing integral molding by injection molding or the like, the built-in parts are exposed to high temperature and high pressure, and the characteristics may deteriorate.

Japanese Unexamined Patent Publication No. 4-252739

An object of the present invention is to prevent deterioration of insert parts.

Method for manufacturing a battery module according to the present invention, a secondary battery is a battery module covered with the resin material, method of manufacturing a battery module manufactured by applying insert molding, is molded of a first resin material and with which the secondary battery to the bottom of the recess in the primary molding section having a recess on one surface are arranged, and, placing a heat insulating part so as to overlap the secondary battery from the opening side of the recess first It has one step and a second step of insert molding with the second resin material so that the secondary molding portion molded with the second resin material covers the secondary battery via the heat insulating component. It is characterized by that.

According to the present invention, deterioration of the insert component can be prevented.

The plan view which shows the insert molded part which concerns on 1st Embodiment of this invention. The vertical sectional view which shows the insert molded part. The vertical sectional view which shows the manufacturing process of the insert molded part. The vertical sectional view which shows the manufacturing process of the insert molded part. The vertical sectional view which shows the insert molded part which concerns on 2nd Embodiment of this invention. The vertical sectional view which shows the insert molded part which concerns on 3rd Embodiment of this invention. The vertical sectional view which shows the insert molded part which concerns on 4th Embodiment of this invention. The vertical sectional view which shows the manufacturing process of the insert molded part which concerns on 5th Embodiment of this invention. The vertical sectional view which shows the manufacturing process of the insert molded part. The vertical sectional view which shows the manufacturing process of the insert molded part.

1 to 4 are explanatory views of the insert molded part 10 according to the first embodiment of the present invention. FIG. 1 is a plan view showing an insert-molded part 10 according to the first embodiment of the present invention, FIG. 2 is a vertical sectional view showing the insert-molded part 10, and FIG. 3 is a vertical cross-sectional view showing a manufacturing process of the insert-molded part 10. FIG. 4 is a vertical sectional view showing a manufacturing process of the insert molded part 10.

As shown in FIGS. 1 and 2, in the insert molded part 10, a primary molding portion 20 made of a resin material such as an acrylic elastomer and a secondary molding portion 30 made of a resin material such as a silicon elastomer are laminated. It is formed. The primary forming portion 20 is provided with a base portion 21. The base portion 21 is provided with a recess 22 (lower stage) and a recess 23 (upper stage) formed in two stages (multi-stage). A lithium ion battery (insert component) 40 is mounted in the recess 22, and a heat insulating component 50 made of an olefin sheet material having a thickness of about 0.3 to 1 mm is arranged in the recess 23. The heat insulating component 50 has a flat plate-shaped base portion 51. The guaranteed operating temperature of the lithium ion battery 40 is 60 ° C., and it is preferable to maintain the temperature at 60 ° C. or lower. Further, the temperature of the silicon-based elastomer forming the secondary molding portion 30 at the time of molding is about 150 ° C.

The insert molded part 10 configured in this way is formed as follows. That is, first, the primary molding unit 20 is injection-molded. Next, as shown in FIG. 3, the recesses 22 and 23 are formed by cutting or the like after the base portion 21 is formed. Next, as shown in FIG. 4, the lithium ion battery 40 is mounted in the recess 22, and the heat insulating component 50 is placed on the lithium ion battery 40. At this time, the heat insulating component 50 and the lithium ion battery 40 are joined by adhesion or the like. The heat insulating component 50 is arranged so as to fit in the recess 23.

Next, a mold is installed on the upper portion of the primary molding portion 20, and secondary molding is performed to form the secondary molding portion 30. The secondary molding portion 30 is formed from a plate-shaped base portion 31. Further, R in FIG. 4 indicates the flow direction of the resin. At this time, the silicon-based elastomer, which is the material of the secondary molding unit 30, is heated to around 190 ° C. Therefore, the upper surface of the heat insulating component 50 of the primary molding portion 20 is heated to a high temperature, but the lithium ion battery 40 is not heated to 60 ° C. or higher due to the heat insulating property of the heat insulating component 50. Therefore, the operation guaranteed temperature of the lithium ion battery 40 is not exceeded. The pressure is also cut off by the heat insulating component 50. It is desirable that the heat insulating component 50 is pressed by a holding component or the like so as not to move due to the pressure of the resin.

Further, even if the lithium ion battery 40 becomes defective during or after molding and cannot be sealed and the internal solution leaks, the heat insulating component 50 is arranged wider than the area of the lithium ion battery 40. Since the base portion 31 is not reached unless it goes around the outer periphery of the heat insulating component 50, safety can be ensured.

For the heat insulating component 50, it is desirable to calculate the heat capacity based on the amount of heat of the secondary molded portion 30 and select the material and thickness. Further, when the heat insulating component 50 protrudes above the base portion 31 of the primary molding portion 20, the resin of the secondary molding portion 30 easily enters, so the dimensions are set so as not to protrude.

As described above, the insert molded part 10 by the insert molding method according to the present embodiment does not excessively raise the temperature of the lithium ion battery 40 when molding the secondary molding portion 30, and is not affected by the high pressure. , It is possible to prevent deterioration of characteristics and destruction. Therefore, insert molding of the lithium ion battery 40 can be realized, and it can be applied to a wristwatch band and a wearable electronic device.

FIG. 5 is a vertical cross-sectional view showing the insert molded part 10A according to the second embodiment of the present invention. In FIG. 5, the same functional parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

The insert molded part 10A is provided with a recess 24 instead of the recess 23. The position of the wall surface on the downstream side along the flow direction R of the secondary molding portion of the recess 24 at the time of molding is inclined to the downstream side from the opening of the recess 24 to the bottom side. A heat insulating component 50A is inserted in the recess 24.

With this configuration, it has the same effect as the insert molded part 10 by the insert molding method described above, and even if pressure is applied to the heat insulating part 50A due to the flow of the resin, the heat insulating part 50A is inside the recess 24. Since the force is applied in the biting direction, there is an effect that the heat insulating component 50A is hard to fall off.

FIG. 6 is a vertical cross-sectional view showing the insert molded part 10B according to the third embodiment of the present invention. In FIG. 6, the same functional parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the insert molded part 10B, the recess 25 is provided instead of the recess 23. A groove is provided on the outer periphery of the recess 25, and has a complicated outer shell. A heat insulating component 50B is arranged in the recess 25. A protruding portion 53 protruding downward from the base portion 51 of the heat insulating component 50B is provided. The protrusion 53 is inserted into the groove of the recess 25.

With this configuration, it has the same effect as the insert-molded part 10 by the insert-molding method described above, and even if the internal solution of the lithium-ion battery 40 leaks, the recess 24 having a complicated shape has a complicated shape. Since it is necessary to go around the outside, it is possible to prevent the base portion 31 from being reached and ensure safety.

FIG. 7 is a vertical cross-sectional view showing the insert molded part 10C according to the fourth embodiment of the present invention. In FIG. 7, the same functional parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the insert molded part 10C, recesses 26, 27, 28 are provided instead of the recess 23. A heat insulating component 50C is arranged in the recess 26, a heat transfer component 60 such as a metal material is arranged in the recess 27, and a heat insulating component 50D is arranged in the recess 28. The inner diameters of the recesses 27 and 28 are formed larger than those of the recesses 22 and 26. That is, the heat transfer component 60 is formed so as to project outward from the heat insulating component 50C.

When configured in this way, it has the same effect as the insert-molded part 10 by the above-mentioned insert-molding method. Further, when the heat from the resin forming the secondary molding portion 30 is transferred from the heat insulating component 50D to the lithium ion battery 40 side, the heat can be released from the heat transfer component 60 to the base portion 21 side, and the lithium ion battery The amount of heat transferred to 40 can be reduced.

8 to 10 are vertical cross-sectional views showing a manufacturing process of the insert molded part 10D according to the fifth embodiment of the present invention. In these figures, the same functional parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 8, in the insert molded part 10D, the heat insulating part 70 is used instead of the heat insulating part 50. The heat insulating component 70 includes a base portion 71 that is inserted into the recess 23, and a protrusion forming portion 72 that is formed so as to protrude from the base portion 71 toward the secondary molding portion 30. Further, a flange portion 73 formed from the protrusion forming portion 72 in a direction parallel to the flow direction R of the resin is provided.

When such a heat insulating component 70 is used, as shown in FIG. 9, an additional mold (closer member) 80 prevents the heat insulating component 70 from moving due to the resin, and then the secondary molding portion 30. Perform injection molding for. After the mold 80 is taken out, the insert molded part 10D having the structure as shown in FIG. 10 is formed.

When configured in this way, it has the same effect as the insert-molded part 10 by the above-mentioned insert-molding method. Further, by reducing the amount of resin that comes into contact with the base portion 71, the amount of heat that affects the lithium ion battery 40 can be reduced. Further, since the heat insulating component 70 is sealed in the secondary molding portion 30 in addition to the primary molding portion 20, there is an effect that the strength after molding is increased.

The present invention is not limited to the above embodiment. For example, in the above-mentioned example, a lithium ion battery is exemplified as an insert molded part, but it can be similarly applied to an organic EL as a heat-sensitive device, an electronic product bonded by an anisotropic conductive film, or the like. Of course. In addition, it goes without saying that various modifications can be carried out without departing from the gist of the present invention.

Although some embodiments of the present invention have been described, the present invention is included in the invention described in the claims and the equivalent scope thereof. The inventions described in the claims of the original application of the present application are described below.
[Appendix 1]
A recess is formed on one surface of the primary molding part to form a recess.
In the recess of the primary molding portion, an insert component is arranged on the bottom side, and a heat insulating component is arranged by laminating on the opening side of the recess with respect to the insert component.
An insert molding method in which a secondary molding portion is molded so as to be arranged in contact with the one surface of the primary molding portion.
[Appendix 2]
The insert molding method according to [Appendix 1], wherein the insert component is a secondary battery.
[Appendix 3]
The insert molding method according to [Appendix 1] or [Appendix 2], wherein the recesses of the primary molding portion are formed in multiple stages.
[Appendix 4]
The insert component is arranged in the lower part of the recess.
The insert molding method according to [Appendix 3], wherein the heat insulating component is arranged in the upper part of the recess.
[Appendix 5]
The insert molding method according to any one of [Appendix 1] to [Appendix 4], wherein the guaranteed temperature of the insert component is set lower than the molding temperature of the secondary molding portion.
[Appendix 6]
The position of the wall surface on the downstream side of the recess along the flow direction during molding of the secondary molded portion is any one of [Appendix 1] to [Appendix 5] that is inclined toward the downstream side from the opening to the bottom side. The insert molding method described in.
[Appendix 7]
The insert molding method according to [Appendix 3], wherein a groove is formed in the upper part of the recess.
[Appendix 8]
The insert component is arranged on the bottom side of the lower part of the recess, and the heat insulating component is arranged on the opening side.
The insert molding method according to [Appendix 3], wherein the heat transfer member is arranged on the bottom side of the upper stage of the recess and the heat insulating component is arranged on the opening side.
[Appendix 9]
The insert molding method according to any one of [Appendix 1] to [Appendix 8], wherein the heat insulating component has a protruding portion formed on the side of the secondary molding portion.
[Appendix 10]
The insert molding method according to [Appendix 9], wherein the heat insulating component is held down by a holding member protruding from the secondary molding portion side.
[Appendix 11]
A primary molded part with a recess formed on one surface,
An insert component arranged on the bottom side of the recess of the primary molding portion, and
A heat insulating component arranged in the recess of the primary molding portion and arranged above the insert component, and a heat insulating component.
A secondary molding portion arranged in contact with the one surface of the primary molding portion, and a secondary molding portion.
Insert molded parts equipped with.
[Appendix 12]
The insert molded part according to [Appendix 11], which is a secondary battery.
[Appendix 13]
The insert-molded part according to [Appendix 11] or [Appendix 12], wherein the recesses of the primary molded portion are formed in multiple stages.
[Appendix 14]
The insert component is arranged in the lower part of the recess.
The insert-molded part according to [Appendix 13], which is arranged in the upper part of the recess.
[Appendix 15]
The insert-molded part according to any one of [Appendix 11] to [Appendix 14], wherein the guaranteed temperature of the insert component is set lower than the molding temperature of the secondary molded portion.
[Appendix 16]
The position of the wall surface on the downstream side of the recess along the flow direction during molding of the secondary molded portion is any one of [Appendix 11] to [Appendix 15] that is inclined toward the downstream side from the opening to the bottom side. Insert molded parts described in.
[Appendix 17]
The insert-molded part according to [Appendix 13], wherein a groove is formed in the upper part of the recess.
[Appendix 18]
The insert component is arranged on the bottom side of the lower part of the recess, and the heat insulating component is arranged on the opening side.
The insert-molded part according to [Appendix 13], wherein the heat transfer member is arranged on the bottom side of the upper part of the recess and the heat insulating part is arranged on the opening side.
[Appendix 19]
The insert molded part according to any one of [Appendix 11] to [Appendix 18], wherein the heat insulating component has a projecting portion formed on the side of the secondary molding portion.

10, 10A, 10B, 10C, 10D ... Insert molded parts, 20 ... Primary molded parts, 21 ... Base parts, 22, 23, 24, 25, 26, 27, 28 ... Recesses, 30 ... Secondary molded parts, 31 ... Base part, 40 ... Lithium-ion battery (insert part), 50, 50A, 50B, 50C, 50D ... Insulation part, 51 ... Base part, 53 ... Protruding part, 60 ... Heat transfer part, 70 ... Insulation part, 71 ... Base Part, 72 ... protrusion forming part, 73 ... collar part, 80 ... mold.

Claims (4)

It is a manufacturing method of a battery module in which a battery module in which a secondary battery is covered with a resin material is manufactured by applying insert molding.
The secondary battery on the bottom side of the recess in the primary molding section having a recess on one surface with being molded in a first resin material disposed, and, overlapping the secondary battery from the opening side of the recess The first step of arranging the heat insulating parts and
A second step of insert molding with the second resin material so that the secondary molding portion molded with the second resin material covers the secondary battery via the heat insulating component.
A method of manufacturing a battery module having. The method for manufacturing a battery module according to claim 1, wherein the recess is formed in multiple stages of a lower recess and an upper recess, and the opening area of the upper recess is formed wider than the opening area of the lower recess. The secondary battery is arranged in the lower recess.
The insulation component, method for producing a battery module according to claim 2 that will be disposed in the upper recess. The first resin material is an acrylic elastomer.
The method for manufacturing a battery module according to any one of claims 1 to 3, wherein the second resin material is a silicon-based elastomer.

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