JP5623920B2 - Double molded product, method for manufacturing double molded product, and battery module - Google Patents

Description

  The present invention relates to a double molded product produced by insert molding a primary molded body having an insert-molded electrical connection terminal.

  In a molded product in which an electrical connection terminal is insert-molded with a resin, a gel may be used to protect the terminal portion (for example, Patent Document 1). Further, a double-molded product is known in which insert molding is performed using a primary molded body in which an electrical connection terminal is insert-molded with a resin as an insert member.

Japanese Patent Application Laid-Open No. 2001-116639

  When a gel is used to protect the terminal part of a double molded product, the gel penetrates the interface between the primary molded product and the secondary molded product and flows out of the surface of the double molded product. It was.

  In Patent Document 1, the interface between the terminal and the resin is formed by covering a region including the joint portion between the terminal and the bonding wire with a sealing resin or adhesive having a relatively high hardness in a process different from the molding. Techniques for sealing have been proposed. However, when a sealing resin or the like is applied so as to close the interface in the double molded product as proposed in Patent Document 1, a production process is reduced because a curing step of the sealing resin or the like is required.

  The double molded article according to the invention of claim 1 is a primary molded body produced by insert molding with resin using the first and second electrical connection terminals in which the connection portions are arranged at a predetermined interval as insert members. And a secondary molded body produced by insert molding with resin as a primary molded body, and a first recess is formed on one side of the secondary molded body and the other side of the secondary molded body. A second recess is formed on each side, and the connection portions of the first and second electrical connection terminals are exposed in the first recess, and a connection conductor for electrically connecting the connection portions is provided. The second concave portion is disposed so as to have a bottom surface on a surface opposite to the connection portion of one of the electrical connection terminals of the primary molded body, and is disposed on the bottom surface of the second concave portion. An inner cylindrical portion that constitutes a multiple cylindrical portion and an inner cylindrical portion so as to surround And at least one of the outer cylindrical portion to be concentric is erected from the surface opposite of the primary molded body, the inner cylindrical portion and the outer cylindrical portion and being covered by a resin cover portion.

  According to a sixth aspect of the present invention, there is provided a method for manufacturing a double molded product, comprising: a primary molding step of insert molding with a resin using the first and second electrical connection terminals as insert members; and an upper mold of a vertical molding machine. By fitting the concave portion provided on the upper part of the primary molded body to the convex portion, the primary molded body holding step for holding the primary molded body by the upper mold, the upper mold of the vertical molding machine is lowered, or the lower mold is By raising, the upper mold and the lower mold are brought close to each other, and the contact convex portion that is erected upward from the lower mold of the vertical molding machine is erected downward in the primary molded body. A process of floating a part of the primary molded body from the lower mold by the abutting convex portion and holding it by contacting the center bottom of the cylindrical portion, and a gap between the upper mold and the lower mold using the primary molded body as an insert member A resin filling process for filling the resin with A cooling step of forming a secondary molded body by cooling and curing the resin, a mold release step of releasing the secondary molded body from the vertical molding machine, a first electrical connection terminal, and a second A terminal connection step of electrically connecting a terminal for electrical connection with a connection conductor, and a gel filling step of filling the gel inside the enclosure wall provided on the upper part of the secondary molded body so as to surround the concave portion of the primary molded body It is characterized by including.

  According to a seventh aspect of the present invention, there is provided a battery module comprising: a plurality of storage batteries; a housing for storing the plurality of storage batteries; a plurality of conductive members for electrically connecting the plurality of storage batteries; and the voltages of the plurality of storage batteries. A voltage detection conductor for detecting, the housing has at least a pair of side plates that sandwich and support a plurality of storage batteries from both sides, and the voltage detection conductor is integrated with the side plate, The side plate is a double-molded product according to any one of claims 1 to 5.

  ADVANTAGE OF THE INVENTION According to this invention, it is a double molded product which prevented the outflow of gel, and while providing the double molded product excellent in productivity, the manufacturing method of the double molded product with high production efficiency can be provided. As a result, a battery module including a double molded product can be provided at a low price.

It is a perspective view which shows the external appearance of the battery module which concerns on embodiment of this invention. It is a disassembled perspective view of the battery module which concerns on embodiment of this invention. It is an external appearance perspective view of the side plate which concerns on embodiment of this invention. It is sectional drawing (AA sectional drawing of FIG. 3) of the side plate which concerns on embodiment of this invention. It is a bottom view of the side plate which concerns on embodiment of this invention. It is sectional drawing of the primary molded object which concerns on embodiment of this invention. It is a bottom view of the primary molded object which concerns on embodiment of this invention. It is side surface sectional drawing which shows the state which set the primary molded object to the vertical molding machine. It is side surface sectional drawing which shows the state with which resin for shape | molding a secondary molded object was filled into the vertical molding machine. It is sectional drawing of the secondary molded object which concerns on embodiment of this invention. It is side surface sectional drawing of the state which apply | coated the gel to the secondary molded object which comprises the conventional double molded article. It is a side surface schematic diagram which shows the flow of the gel in the conventional double molded article. It is the side surface schematic diagram and the plane schematic diagram which show the flow of the gel in the double molded article which concerns on embodiment of this invention. It is a side surface schematic diagram which shows the state which the gel accumulated in the circular opening of the double molded product which concerns on embodiment of this invention. It is a side surface schematic diagram which shows the state by which the secondary molded object which comprises the double molded article which concerns on embodiment of this invention is shrunk. It is side surface sectional drawing of the double molded product which concerns on the modification of this invention. It is side surface sectional drawing which shows the double molded product and the contact convex part of a molding machine which concern on another modification of this invention.

Hereinafter, an embodiment in which a double molded product according to the present invention is applied to a side plate of a battery module will be described with reference to the drawings.
[Battery module]
With reference to FIG. 1 and FIG. 2, the structure of the battery module 100 used for a lithium ion battery apparatus is demonstrated. FIG. 1 is a perspective view showing an external appearance of the battery module 100, and FIG. 2 is an exploded perspective view of the battery module 100. The battery module 100 is controlled by a control device (not shown) to store and release electrical energy (charge and discharge DC power).

  The battery module 100 includes a casing 110 (sometimes referred to as a housing, a housing, or a package) and an assembled battery 120. The assembled battery 120 is housed and held in the casing 110.

  The casing 110 is a substantially hexahedral block housing. Specifically, the inlet channel forming plate 111, the outlet channel forming plate 118, the inlet side guide plate 112, the outlet side guide plate 113, and the side plate 130, 131 includes a combined body of six members.

  In the following description of the battery module 100, the direction in which the casing 110 is the longest and the direction from the cooling medium inlet 114 side to the cooling medium outlet 115 side are defined as the longitudinal direction. Further, the direction in which the side plates 130 and 131 face each other, and the central axis direction of the lithium ion battery cell 140 are defined as the short direction. Furthermore, the direction in which the inlet channel forming plate 111 and the outlet channel forming plate 118 face each other is defined as the height direction regardless of the installation direction of the battery module 100.

  The internal space of the casing 110 functions as a storage chamber in which the assembled battery 120 is stored, and also functions as a cooling passage through which a cooling medium (cooling air) for cooling the assembled battery 120 flows.

  Between the inlet flow path forming plate 111 and the inlet side guide plate 112, a cooling medium inlet 114 is formed that constitutes an inlet for introducing cooling air, which is a cooling medium, into the casing 110. The cooling medium inlet 114 is provided with a cooling medium inlet duct 116 for guiding cooling air to the cooling medium inlet 114. The inlet flow path forming plate 111 and the outlet flow path forming plate 118 are arranged so as to be shifted from each other in the longitudinal direction, and the inlet side end portion of the casing 110 is formed in a step shape.

  Between the outlet flow path forming plate 118 and the outlet side guide plate 113, a cooling medium outlet 115 is formed that constitutes an outlet for the cooling air from the inside of the casing 110. The cooling medium outlet 115 is provided with a cooling medium outlet duct 117 for guiding the cooling air from the cooling medium outlet 115 to the outside.

  The cooling medium inlet 114 is located on the inlet flow path forming plate 111 side, and the cooling medium outlet 115 is located on the outlet flow path forming plate 118 side. That is, the positions of the cooling medium inlet 114 and the cooling medium outlet 115 are shifted in the height direction (the direction in which the inlet flow path forming plate 111 and the outlet flow path forming plate 118 face each other).

  The inlet channel forming plate 111, the outlet side guide plate 113, the cooling medium inlet 114, and the cooling medium inlet duct 116 are integrally formed, and the outlet channel forming plate 118, the inlet side guide plate 112, the cooling medium outlet 115, and the cooling medium outlet. The duct 117 is integrally formed.

  The inlet channel forming plate 111, the outlet channel forming plate 118, the inlet side guide plate 112, the outlet side guide plate 113, the cooling medium inlet 114 and the cooling medium outlet 115, and the side plates 130 and 131 are coupled with screws or bolts. Alternatively, it is performed by fixing means (not shown) such as rivets.

  The side plates 130 and 131 are substantially rectangular flat plate members that form two side surfaces facing the short side direction of the casing 110. The detailed configuration of the side plates 130 and 131 will be described later.

  The cover 160 is a flat plate formed by pressing a metal plate such as iron or aluminum, or a flat plate formed by molding a resin such as PBT. The cover 160 is configured to have substantially the same shape as the planar shape of the side plate 130. In the cover 160, a region including a portion corresponding to the through hole 132 of the side plate 130 is uniformly swollen on the side opposite to the side plate 130. Therefore, there is a space between the outside of the side plate 130, that is, the outer wall surface opposite to the inner wall surface that forms the storage chamber of the assembled battery 120, and the inner wall surface of the cover 160, that is, the surface on the side plate 130 side. It is formed.

  In addition to being used as a gas discharge space, this space is also used as a space where the bus bar 150 and the voltage detection conductor, which are conductive members attached to the side plate 130, do not contact the cover 160.

  The assembled battery 120 is an aggregate (lithium ion battery cell group) of a plurality of lithium ion battery cells (storage batteries) 140. The plurality of lithium ion battery cells 140 are stored in alignment in a storage chamber formed inside the casing 110, and are sandwiched and supported by a pair of side plates 130 and 131 from both sides in the short direction. They are electrically connected in series by joining with a bus bar (conductive member) 150.

  The battery module 100 is configured as a high potential battery module or a low potential battery module. For example, the high potential side battery module 100 and the low potential side battery module 100 are electrically connected in series, that is, the battery module is configured by two battery modules (not shown). The power storage module constitutes a power storage device (not shown) together with a control device that controls the power storage module.

  On the air outlet side of the surface of the side plate 130 on the inlet flow path forming plate 111 side, high-voltage connection terminals 180 and 181 are provided side by side in the longitudinal direction. The connection terminals 180 and 181 are connected to a DC positive input / output terminal and a negative input / output terminal (not shown), respectively. A positive-side input / output terminal of the high-potential-side battery module 100 is connected to a positive-side power cable terminal, and a negative-side input / output terminal is electrically connected to one end of an SD (service disconnect) switch. Are connected. A terminal of a cable electrically connected to the other end of the SD switch is connected to the positive input / output terminal of the low potential battery module 100. The terminal of the negative power cable is connected to the negative input / output terminal of the low potential battery module 100. The SD switch is a safety device provided to ensure safety during maintenance and inspection of the power storage device. It is composed of an electric circuit in which the switch and fuse are electrically connected in series, and is maintained by a service person. Operated during inspection.

[Side plate]
Next, with reference to FIGS. 2 to 5, the configuration of the pair of side plates 130 and 131 that sandwich and support the assembled battery 120 from both sides will be described.

  As shown in FIGS. 2 and 3, the side plate 130 has a rectangular flat plate-shaped clamping plate portion and a connection terminal portion 810, and 16 circular through holes 132 are formed in the clamping plate portion. ing. The through holes 132 are arranged so as to open corresponding to the electrode positions of the 16 lithium ion battery cells 140 housed in the housing. Therefore, when the assembled battery 120 is housed in the casing 110, each through hole 132 is blocked by the terminal surface of the corresponding lithium ion battery cell 140. The positive and negative electrodes of the lithium ion battery cell 140 are electrically connected to each other by a bus bar 150 disposed in association with the through holes 132 of the side plates 130 and 131.

  As shown in FIG. 2, a pair of weak electrical connection terminal portions 810 are arranged in the longitudinal direction on the air inlet side of the surface on the inlet flow path forming plate 111 side of the side plate 130. As will be described later, in order to detect the respective voltages of the plurality of battery cells 140, one end of the voltage detection conductor 20 integrated with the side plate 130 is connected to the bus bar 150 of each battery cell 140, and their voltage detection is performed. The other end of the conductor 20 is connected to each pin (external terminal connection portion) of the terminal portion 810.

  4 is a cross-sectional view taken along the line AA in FIG. 3, and FIG. 5 is a bottom view showing the connection terminal portion 810 of the side plate 130. Here, for the sake of simplicity, only the configuration of one side plate 130 will be described, but the other side plate 131 is basically configured similarly to the one side plate 130.

  However, the high-power connection terminal 180 on the battery module side electrically connected to the positive electrode side of the assembled battery 120 and the high-power connection terminal 181 on the battery module side electrically connected to the negative electrode side of the assembled battery 120 are: It is provided only on one side plate 130 (see FIGS. 1 and 2).

  The side plate 130 is a double-molded product made of a resin such as PBT having electrical insulation, and is manufactured by insert molding using the primary molded body 3 (see FIG. 6) as an insert member. The primary molded body 3 is produced by insert molding with PBT resin using the voltage detection conductor 20 and the external terminal 4 which are electrical connection terminals as insert members. The secondary molded body 1 is produced by insert molding with PBT resin using the primary molded body 3 as an insert member.

  As shown in FIGS. 4 and 5, the weak electrical connection terminal portion 810 has a first recess 90 filled with gel 9 on the outside of the battery module of the side plate 130 that is a double-molded product. A rectangular box-shaped connector portion 92 is formed. The connector portion 92 is provided with each connection portion (pin) 4b described above.

  As shown in FIGS. 4 and 5, in the first recess 90, the exposed surface 4a of the external terminal 4 and the conductor exposed surface 20a at one end of the voltage detection conductor 20 are respectively provided at predetermined intervals as connecting portions of the electrical connection terminals. It is arranged with a gap. The other end (not shown) of the voltage detection conductor 20 is TIG welded to the bus bar 150. The connection conductor 7 is fixed to the external terminal exposed surface 4a and the voltage detection conductor exposed surface 20a with solder 8, and both are electrically connected. The connection conductor 7 is disposed in the first recess 90, and the first recess 90 protects and insulates the connection conductor 7 and the electrical connection between the connection conductor 7 and the conductor exposed surfaces 4a and 20a. Gel 9 is filled.

  A feature of the present invention is that a double cylindrical portion 33 devised so that the gel 9 does not leak to the outer surface of the side plate 130 via the interface 50 between the primary molded body 3 and the secondary molded body 1 is provided. .

  In the connector portion 92, a connection portion (pin) 4 b of the external terminal 4 protrudes toward the outside of the side plate 130. The connection portion 4b is directly connected to a wiring (connection line) extending from a voltage detection connector of a control device (not shown). Therefore, the voltages of the plurality of lithium ion battery cells 140 constituting the assembled battery 120 can be detected from the connection portion 4b via the voltage detection conductor 20.

  A second recess 11 is formed on the outer peripheral surface of the side plate 130. The 2nd recessed part 11 is provided in the opposite side to the one side in which the 1st recessed part 90 is provided in a double molded product. The second recess 11 is constituted by a circular through-opening in the secondary molded body 1 and the surface of the primary molded body 3. That is, the bottom surface of the second recess 11 is the surface of the primary molded body 3 and is constituted by a part of the surface opposite to the connection portion of the voltage detection conductor 20.

  On the surface of the primary molded body 3 constituting the bottom surface of the second recess 11 (the surface opposite to the connection portion of the voltage detection conductor 20), the double cylindrical portion 33 faces the outside of the primary molded body 3. It is erected. The double cylindrical portion 33 includes an inner cylindrical portion 33a provided so as to surround the vicinity of the bottom surface of the second concave portion 11, and an outer cylindrical portion 33b concentric with the inner cylindrical portion 33a. The double cylindrical portion 33 is covered with the resin covering portion 13 of the secondary molded body 1 except for the second concave portion 11.

  The second concave portion 11 is formed to a size that can accommodate and hold a certain amount of gel 9 so that the gel 9 filled in the first concave portion 90 does not undesirably leak from the outer peripheral surface of the side plate 130. .

  In the present embodiment, the diameter of the second recess 11 is about 1 to 3 mm, and the height of the second recess 11 is about 1 to 5 times the diameter of the second recess 11. The height dimension of the inner cylindrical portion 33a is the same as the height dimension of the outer cylindrical portion 33b.

  Note that the surface of the primary molded body 3 constituting the bottom surface of the second concave portion 11 is a receiving portion with which a contact convex portion standing on a mold provided in a molding machine for molding the secondary molded body 1 contacts. It is said.

[Production Method of Side Plate and Configuration of Primary Molded Body and Secondary Molded Body]
A method for manufacturing the side plate 130 will be described. Together with the manufacturing method, the configuration of the primary molded body 3 and the secondary molded body 1 will be described in detail.

[Primary molded body]
6 and 7 show the primary molded body 3. The primary molded body 3 is obtained by resin molding the four external terminals 4 and the four voltage detection conductors 20. That is, the primary molded body 3 is produced by insert molding with resin using the external terminal 4 and the voltage detection conductor 20 as an insert member. 6 and 7, the number of external terminals 4 is four, but in actuality, the number corresponding to the number of battery cells 140 is necessary.

  The resin portion of the primary molded body 3 has a recess 90 a, a terminal receiving plate 39, and a terminal embedded portion 32. The concave portion 90a is a portion constituting a part of the first concave portion 90 of the side plate 130 described above, and is held by one of a pair of molds provided in a molding machine for molding the secondary molded body 1 described later. The molded body side holding part. The terminal receiving plate 39 is a flat plate member extending to one side of the recess 90a, and one end of the voltage detection conductor 20 is provided on one surface (surface on the recess 90a side) of the terminal receiving plate 39. Is fixed. The external terminal 4 is embedded in the terminal embedded portion 32.

  One end of the external terminal 4 protruding from the resin portion is used as a connection portion (pin) 4b with a harness extending from the voltage detection connector of the control device. The other end of the external terminal 4 embedded in the terminal embedded portion 32 is bent, and one surface thereof is exposed as an exposed surface 4a in the vicinity of the recess 90a.

  One end of the voltage detection conductor 20 extends to the vicinity of the recess 90a, and the upper surface thereof is an exposed surface 20a. The other end (not shown) of the voltage detection conductor 20 is electrically connected to the bus bar 150 by TIG welding.

As shown in FIG. 7, the rectangular flat terminal receiving plate 39 includes a double cylindrical portion 33 that protrudes outward from the side plate 130 between the two voltage detection conductors 20. Here, a case where four voltage detection conductors 20 are provided is shown.
As described above, each double cylindrical portion 33 includes the inner cylindrical portion 33a and the outer cylindrical portion 33b, and both the cylindrical portions 33a and 33b are concentric. The center bottom portion of the double cylindrical portion 33 serves as a receiving portion 31 with which a contact convex portion standing on a mold provided in a molding machine for molding the secondary molded body 1 described later contacts. That is, the inner cylindrical portion 33a is formed so as to surround the receiving portion 31, and the outer cylindrical portion 33b is formed so as to surround the inner cylindrical portion 33a.

  The secondary molding process will be described with reference to FIGS. FIG. 8 is a side sectional view showing a state (molding position) in which the primary molded body 3 is set in the vertical molding machine 2. FIG. 9 is a side sectional view showing a state in which the vertical molding machine 2 is filled with resin. FIG. 10 is a cross-sectional view showing the secondary molded body 1.

[Vertical molding machine used for secondary molding]
The secondary molded body 1 is molded by a vertical molding machine 2 including a pair of molds. As shown in FIGS. 8 and 9, the vertical molding machine 2 has an upper mold 21 that is a first mold and a lower mold 22 that is a second mold. One of the upper mold 21 and the lower mold 22 can be moved up and down in the vertical direction.

  The upper mold 21 is formed with a fitting convex portion 23 that is fitted to the concave portion 90 a of the primary molded body 3. The fitting convex portion 23 functions as a mold side holding portion that holds the primary molded body 3 by fitting with the concave portion 90 a of the primary molded body 3. A terminal abutting portion 26 that abuts on the external terminal 4 and the exposed surfaces 4 a and 20 a of the voltage detection conductor 20 is formed around the fitting convex portion 23. The lower mold 22 is provided with a columnar contact convex portion 24 that is in contact with the receiving portion 31 of the primary molded body 3 and is erected upward. The diameter of the cylindrical abutment convex portion 24 is about 1 to 3 mm.

[Primary molded body holding process]
The upper mold 21 holds the primary molded body 3 by fitting the recess 90 a provided on the upper part of the primary molded body 3 to the fitting convex portion 23 of the upper mold 21. The terminal contact portion 26 is brought into contact with the external terminals 4 and the exposed surfaces 4 a and 20 a of the voltage detection conductor 20.

[Position adjustment process]
The upper mold 21 is moved down while the upper mold 21 is held in the primary molded body 3 or the lower mold 22 is moved up to bring the upper mold 21 and the lower mold 22 closer to each other, as shown in FIG. Thus, the upper mold | type 21 or the lower mold | type 22 is arrange | positioned in a molding position.

  In the molding position, the contact convex portion erected upward from the lower mold 22 to the receiving portion 31 which is the center bottom portion of the bottomed double cylindrical portion 33 erected downward from the terminal receiving plate 39 of the primary molded body 3. 24 is abutted. In other words, the terminal receiving plate 39 is held at a predetermined position in the gap of the mold at a position that is lifted by a predetermined amount from the lower mold 22 by the contact protrusion 24 of the lower mold 22.

[Resin filling process]
As shown in FIG. 9, the resin is filled in the gap between the upper mold 21 and the lower mold 22 using the primary molded body 3 as an insert member. In addition, since the contact convex part 24 is contact | abutted to the receiving part 31, and the terminal receiving plate 39 is hold | maintained in the state which floated from the lower mold | type 22, it insert-molded in the state which the primary molded object 3 bent. Is prevented.

[Cooling process]
The filled resin 1 is formed by cooling and curing the filled resin.
[Release process]
The cured resin molded product (secondary molded body 1) is released from the vertical molding machine 2. As shown in FIG. 10, the secondary molded body 1 is produced so as to cover the surface of the primary molded body 3 excluding the portion where the mold is in contact.

[Secondary molding]
As shown in FIG. 10, the secondary molded body 1 is obtained by molding the primary molded body 3 with a resin. The concave portion 90a of the primary molded body 3, the exposed surface 20a of the voltage detection conductor 20, and the exposed surface 4a of the external terminal 4 are exposed on the resin surface. The periphery of the recess 90 a is opened by the terminal contact portion 26 of the upper mold 21, and a recess shape is formed by the recess 90 a of the primary molded body 3 and the surrounding wall 91 provided on the upper portion of the secondary molded body 1. One recess 90 is formed.

  The double cylindrical portion 33 of the primary molded body 3 is covered with the resin cover portion 13 of the secondary molded body 1. The resin cover 13 is formed so as to cover the inner and outer peripheral surfaces of the inner cylindrical portion 33a and the inner and outer peripheral surfaces of the outer cylindrical portion 33b. In the resin cover portion 13, a circular opening having a diameter of about 1 to 3 mm is formed outward from the receiving portion 31 by the contact convex portion 24 of the lower mold 22. A second recess 11 is formed.

[Terminal connection]
After producing the secondary molded body 1, the exposed surface 20 a of the voltage detection conductor 20 and the exposed surface 4 a of the external terminal 4 are electrically connected by the connection conductor 7 in the first recess 90. The connection conductor 7 is connected by solder 8.
[Gel filling process, gel curing process]
The gel 9 for protecting the connection conductor 7 and the electrical connection portion is filled in the first recess 90 in a state where the first recess 90 is disposed upward. After the gel 9 is filled inside the enclosure wall 91 formed so as to surround the connection conductor 7 disposed in the recess 90a of the primary molded body 3 and the electrical connection between the connection conductor 7 and the exposed surfaces 4a and 20a. The gel 9 is cured by performing a curing process at a temperature of 140 ° C. to 150 ° C. for about 30 to 60 minutes. When the curing process of the gel 9 is completed, as shown in FIGS. 3 and 4, the side plate 130 as a double-molded product is completed.

  In the double molded product configured as described above, an interface 50 between the primary molded body 3 and the secondary molded body 1 is formed in the first recess 90 (see FIGS. 4 and 5). Therefore, when the gel 9 is filled into the first recess 90, the gel 9 penetrates from the interface 50. The permeated gel 9 travels along the interface 50 and flows into the receiving portion 31 side of the primary molded body 3. However, in the double molded product according to the present embodiment, since the double cylindrical portion 33 is formed, when the gel 9 is filled by the so-called labyrinth effect, the gel 9 is applied to the surface of the secondary molded body 1. It can prevent outflow. Hereinafter, the function of preventing the flow of the gel 9 will be described with reference to FIGS.

  FIG. 11 is a side sectional view showing a state in which gel 9 is applied to secondary molded body 1 constituting a conventional double molded article, and FIG. 12 is a secondary molded body constituting a conventional double molded article. 1 is a schematic side view showing a flow of gel 9 that has penetrated into an interface 50 between 1 and a primary molded body 3. FIG. 13 is a schematic side view and a schematic plan view showing the flow of the gel 9 that has permeated the interface 50 between the secondary molded body 1 and the primary molded body 3 constituting the double molded product according to the embodiment of the present invention. FIG. 14 is a schematic side view showing a state where the gel 9 is accumulated in the second recess 11 of the double molded product according to the embodiment of the present invention. In FIG. 11 and FIG. 12 showing the conventional double-molded product, the same or corresponding components as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the conventional double-molded product, as shown in FIG. 11, the receiving portion 41 that is a part of the lower surface of the primary molded body 3 constitutes a part of the surface of the double-molded product. The receiving portion 41 is a portion that comes into contact with the lower die 22 of the vertical molding machine 2 when forming the secondary molded body 1. That is, in the conventional double molded product, the double cylindrical portion is not formed on the terminal receiving plate 39 as in the present embodiment.

  In the conventional double-molded product, when the upper concave portion 90 is filled with the gel 9, the gel 9 immediately after filling has a low viscosity. Therefore, as shown in FIG. 12, the primary molded body 3 and the secondary molded body 1 The gel 9 penetrates into the interface 50. The permeated gel 9 flows along the interface 50 and flows out to the lower surface of the double molded product. When the gel 9 flows out, there is a problem that the amount of the gel 9 in the first recess 90 is reduced and the electrical connection portion is not sufficiently protected and insulated. Further, when the predetermined time has elapsed, the gel 9 is hardened and the gel pool 9a is formed on the surface of the double molded product, that is, the outer surface of the side plate 130.

  In the double molded product according to the present embodiment, a double cylindrical portion 33 is formed so as to surround the receiving portion 31 (see FIG. 4). Therefore, as shown in FIG. 13 (b), the gel 9 that has permeated the interface 50a at the side edge of the primary molded body 3 is, as shown in FIG. 13 (a), the bottom surface of the primary molded body 3 by gravity. It progresses to.

  The gel 9 reaching the interface 50b on the lower surface of the primary molded body 3 flows downward along the outer peripheral surface of the outer cylindrical portion 33b in the double cylindrical portion 33 as shown in FIG. It proceeds on the top surface of 33b and further flows upward along the inner peripheral surface. Further, the gel 9 flows downward along the outer peripheral surface of the inner cylindrical portion 33a, proceeds on the top surface of the inner cylindrical portion 33a, and further flows upward along the inner peripheral surface. Since the upward flow is performed against gravity, it is effective in suppressing the progress.

  In addition, on the outer peripheral surface of the outer side cylindrical part 33b, as shown in FIG.13 (b), the gel 9 advances also to the circumferential direction. The gel 9 that has progressed in the circumferential direction of the outer cylindrical portion 33 b is filled in the interface so as to cover the outer peripheral surface of the outer cylindrical portion 33 b, and proceeds toward the center of the double cylindrical portion 33.

  The gel 9 that has penetrated to the receiving portion 31 that is the center of the double cylindrical portion 33 flows out into the second recess 11. As shown in FIG. 14, the gel 9 that has flowed out is retained in the second recess 11 by the surface tension and is cured, and a gel pool 9 a is formed in the second recess 11.

According to this Embodiment described above, there can exist the following effects.
(1) By forming the double cylindrical portion 33, the traveling path of the permeated gel 9 is lengthened, so that the progress of the gel 9 is suppressed by viscous resistance (friction resistance) and the outflow of the gel 9 is suppressed. be able to.
(2) Since the gel 9 that has flowed out into the second concave portion 11 is cured while being retained in the second concave portion 11 due to surface tension, the gel 9 that has been released and filled is reduced. Can be prevented. Since the gel reservoir 9a is formed in the second recess 11, the appearance is good.
(3) A double-molded product that prevents the gel 9 from flowing out to protect the component to be attached according to (1) and (2), and is applied with an adhesive or sealing resin for closing the interface 50 To provide a double-molded product excellent in productivity that does not require a process, a manufacturing method of a double-molded product with high production efficiency, and an inexpensive battery module 100 using the double-molded product as a side plate 130. Can do.

  (4) The resin material constituting the secondary molded body 1 contracts when cured in the mold. According to the present embodiment, as shown in FIG. 15, the contraction force toward the center of the double cylindrical portion 33 acts equally on the outer peripheral wall surfaces of the inner cylindrical portion 33 a and the outer cylindrical portion 33 b of the double cylindrical portion 33. The adhesion between the resin and the double cylindrical portion 33 is improved. By improving the adhesion, the progress of the gel 9 penetrating into the interface 50 between the primary molded body 3 and the secondary molded body 1 is further suppressed.

The above-described embodiment can be modified as follows.
[Modification]
(1) Although the double cylindrical part 33 was provided in the terminal receiving plate 39 in above-described embodiment, the number of cylindrical parts is not limited. As shown in FIG. 16, a triple cylindrical portion 43 may be provided on the terminal receiving plate 39. By increasing the cylindrical portion, it is possible to lengthen the path through which the permeated gel 9 travels and further suppress the progress by frictional resistance. The number of cylindrical portions may be four or more. When a space for forming the multiple cylindrical portions can be ensured, the outflow of the gel 9 can be reliably prevented by providing a large number of cylindrical portions.

  (2) The dimensions of the second recess 11 are about 1 to 3 mm in diameter and the height dimension is larger than the diameter of the second recess 11, but each dimension is not limited to this. What is necessary is just to set the dimension of the 2nd recessed part 11 so that the gel 9 may be hold | maintained by the surface tension which arises from atmospheric pressure, when the gel 9 penetrate | invades in a recessed part.

  (3) The abutting convex portion 24 erected on the lower die 22 of the vertical molding machine 2 is not limited to a cylindrical shape. Various shapes such as a rectangular column shape can be employed. As shown in FIG. 17, the contact convex portion 24 may be formed in a columnar shape, and the tip end portion may be formed in a taper shape so that the tip is tapered toward the tip. Further, the inner peripheral wall of the inner cylindrical portion 33a in the vicinity of the receiving portion 31 may be tapered so as to spread outward. The tapered surface 29 functions as a guide when the primary molded body 3 is disposed in the mold by forming the tapered surface 29 on both or either one of the contact convex portion 24 and the inner peripheral wall of the multiple cylindrical portion. Therefore, since the primary molded body 3 can be easily positioned with respect to the lower mold 22, productivity is improved.

  (4) The primary molded body 3 and the secondary molded body 1 are not limited to the case of molding with PBT resin. Even if the primary molded body 3 and the secondary molded body 1 are formed from other thermoplastic resins, thermosetting resins, or resins in which these resins are filled with fillers such as glass fibers of inorganic materials or carbon fibers of organic materials. Good. In addition, the kind of material of the primary molded object 3 and the secondary molded object 1 may differ.

  (5) The heights of the cylindrical portions constituting the multiple cylindrical portions may be the same, or may be formed such that the height of the inner cylindrical portion 33a is higher than that of the outer cylindrical portion 33b. . You may form so that the height dimension of the outer side cylindrical part 33b may become higher than the inner side cylindrical part 33a.

(6) The present invention is not limited to the case where the secondary molded body 1 in the double molded product is formed by the vertical molding machine 2. You may form the secondary molded object 1 in a double molded product with a horizontal molding machine.
(7) The fitting convex part 23 provided in the upper mold | type 21 of a vertical molding machine is not limited to when providing so that it may protrude below. A concave portion recessed upward is formed on the upper die 21 as a mold side holding portion, a convex portion protruding upward is formed on the primary molded body 3 as a molded body side holding portion, and both are fitted to each other to fit the upper die 21. Alternatively, the primary molded body 3 may be held. In the produced double molded product, the convex portion of the primary molded body 3 is disposed in the first concave portion 90 of the secondary molded body 1.

  (8) The resin cover 13 in the secondary molded body 1 may not cover the inner peripheral surface of the inner cylindrical portion 33a. By making the diameter of the contact convex portion 24 provided in the mold substantially the same as the inner diameter of the inner cylindrical portion 33a, the second concave portion 11 having substantially the same diameter as the inner cylindrical portion 33a is formed. Also good.

  (9) The double molded product is not limited to being used for the side plate 130. It can be used as a part of various electric devices.

  The present invention is not limited to the embodiment described above, and can be freely changed and improved without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 1 Secondary molded object, 2 Vertical molding machine, 3 Primary molded object, 4 External terminal, 4a Exposed surface, 4b Connection part, 7 Connection conductor, 9 Gel, 9a Gel reservoir, 11 2nd recessed part, 13 Resin cover part , 20 Voltage detection conductor, 20a Exposed surface, 21 Upper mold, 22 Lower mold, 23 Fitting convex part, 24 Abutting convex part, 31 Receiving part, 33 Double cylindrical part, 33a Inner cylindrical part, 33b Outer cylindrical part, 39 terminal receiving plate, 50 interface, 90 first recess, 90a recess, 91 enclosure wall, 100 battery module, 110 casing, 120 assembled battery, 130, 131 side plate, 140 battery cell, 810 connection terminal portion

Claims (7)

A primary molded body produced by insert-molding a resin with the first and second electrical connection terminals arranged at predetermined intervals between the connecting portions as an insert member;
The primary molded body has a secondary molded body produced by insert molding with resin as an insert member,
A first recess is formed on one side of the secondary molded body, and a second recess is formed on the other side of the secondary molded body,
In the first recess, the connection portions of the first and second electrical connection terminals are exposed, and a connection conductor that electrically connects the connection portions is disposed and filled with gel,
The second recess is provided so that a surface opposite to a connection portion of one of the electrical connection terminals of the primary molded body is a bottom surface,
An inner cylindrical portion that forms a multiple cylindrical portion and at least one outer cylindrical portion that is concentric with the inner cylindrical portion so as to surround the bottom surface of the second concave portion are on the opposite side of the primary molded body. Standing from the surface,
The double-molded product, wherein the inner cylindrical portion and the outer cylindrical portion are covered with a resin cover portion. In the double-molded product according to claim 1,
The double-molded product, wherein the second recess has a circular shape, and the height of the second recess is equal to or greater than the diameter of the second recess. In the double molded product according to claim 1 or 2,
A double-molded product, wherein the height of the inner cylindrical portion is equal to or greater than the height of the outer cylindrical portion. In the double molded product according to any one of claims 1 to 3,
The primary molded body is formed with a recess that constitutes a part of the first recess,
The concave portion of the primary molded body is a molded body side holding portion held by one of a pair of molds provided in a molding machine for molding the secondary molded body,
The surface on the opposite side of the primary molded body constituting the bottom surface of the second recess is a receiving portion with which an abutment projection standing on the other of the pair of molds abuts. Double molded product. In the double-molded product according to claim 4,
A double-molded article characterized in that the inner peripheral wall of the inner cylindrical portion in the vicinity of the receiving portion is tapered so as to spread outward. A primary molding step in which the first and second electrical connection terminals are insert-molded with resin as an insert member;
A primary molded body holding step of holding the primary molded body by the upper mold by fitting a concave section provided in the upper part of the primary molded body to the convex section provided in the upper mold of the vertical molding machine;
Lowering the upper mold of the vertical molding machine or raising the lower mold to bring the upper mold and the lower mold closer to each other so that the abutment is erected upward from the lower mold of the vertical molding machine. A step of causing the abutment convex portion to float and hold a part of the primary molded body by bringing the convex portion into contact with the center bottom portion of the bottomed multi-cylindrical portion erected downward in the primary molded body; and
Resin filling step of filling the gap between the upper mold and the lower mold with the primary molded body as an insert member,
A cooling step of forming a secondary molded body by cooling and curing the filled resin;
A mold release step of releasing the secondary molded body from the vertical molding machine;
A terminal connection step of electrically connecting the first electrical connection terminal and the second electrical connection terminal by a connection conductor;
And a gel filling step of filling a gel inside the enclosure wall provided on the upper part of the secondary molded body so as to surround the concave portion of the primary molded body. A plurality of storage batteries;
A housing for housing the plurality of storage batteries;
A plurality of conductive members for electrically connecting the plurality of storage batteries;
A voltage detection conductor for detecting the voltage of each of the plurality of storage batteries,
The housing has at least a pair of side plates that sandwich and support a plurality of storage batteries from both sides, and the voltage detection conductor is integrated with the side plates,
The battery module according to claim 1, wherein the side plate is a double-molded product according to claim 1.

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