JP2013118110A - Positioning member and mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning member and a mold which inhibit a melting hot-melt adhesive from flowing in a through hole formed in the positioning member.SOLUTION: A positioning member 30 is attached to a flat type battery formed by sealing a power generation element with a sheath material, and a through hole 31 for positioning the flat type battery is formed in the positioning member 30. The positioning member 30 has a sleeve 34 which protrudes from a flat surface 33 around the through hole 31 so as to enclose the through hole 31, the sleeve 34 where a cutout part 35 is formed at a part in a circumferential direction; and a protruding part 36 linearly extending on the flat surface 33 facing the cutout part 35.

Description

  The present invention relates to a positioning member and a mold applied to a flat battery.

  In recent years, in various types of batteries such as automobile batteries, solar batteries, and electronic equipment batteries, flat batteries in which battery elements are sealed with an exterior material made of a laminate sheet and electrode terminals are led out from the exterior material are used. . For example, in the flat battery described in Patent Document 1, a positioning member for connecting to another member is attached to the side where the electrode terminal of the exterior material is derived, and the electrode terminal of the exterior material is derived. Reinforcing members for improving the mechanical strength of the exterior material made of a laminate sheet are attached to both sides of the side.

JP 2007-73510 A

  However, for example, when forming a reinforcing member by forming a positioning through-hole in the positioning member and supplying the molten hot melt adhesive in the mold to the side of the exterior material and curing it, the molten hot There is a possibility that the melt adhesive flows into the through hole of the positioning member. If a sleeve protruding from the surface is provided on the entire circumference of the through-hole, inflow can be prevented in advance, but if the battery area is to be as large as possible, it is necessary to form a notch in a part of the sleeve in the circumferential direction. In this case, when the hot melt adhesive flows into the through hole and the molten hot melt adhesive flows into the hole of the positioning member and hardens, a member such as a bolt penetrating the through hole is required for positioning the flat battery. Cannot penetrate.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a positioning member and a mold that can suppress the flow of molten hot melt adhesive into a through hole formed in the positioning member. And

  The positioning member of the present invention is a positioning member that is attached to a flat battery in which a power generation element is sealed with an exterior material and has a through-hole for positioning the flat battery. The positioning member protrudes from the surrounding surface so as to surround the through-hole and has a sleeve in which a notch is formed in a part in the circumferential direction, and extends linearly on the surface so as to face the notch And a convex portion.

  The mold of the present invention includes a flat battery in which a power generation element is sealed with an exterior material, and a sleeve that protrudes from the surrounding surface so as to surround the through-hole and has a notch formed in a part of the circumferential direction. A mold for joining the flat battery and the positioning member by flowing a hot melt adhesive in a state in which the positioning member is accommodated. The mold has a convex portion that extends linearly on the contact surface that contacts the surface of the positioning member so as to face the notch when the mold is clamped.

  According to the positioning member of the present invention, the surface of the positioning member protrudes from the surrounding surface so as to surround the through hole of the positioning member and faces the notch portion of the sleeve in which the notch portion is formed in a part in the circumferential direction. Since a linear protrusion is formed on the surface, the hot melt adhesive is prevented from flowing into the through-hole through the notch when the positioning member and the flat battery are bonded using the hot melt adhesive. it can.

  Further, according to the mold of the present invention, the contact surface that contacts the surface of the positioning member has the linear convex portion that contacts the notch portion when the mold is clamped. When the positioning member and the flat battery are joined using the melt adhesive, it is possible to suppress the hot melt adhesive from flowing into the through hole through the notch.

It is a perspective view which shows a battery module. It is a perspective view which shows the cell unit of the battery module shown by FIG. It is a perspective view which shows a flat type battery. It is a disassembled perspective view which shows the back side of the laminated body shown by FIG. It is a top view which shows the flat battery which joined the spacer which concerns on 1st Embodiment with the joining member. It is a perspective view which shows the principal part of the spacer which concerns on 1st Embodiment. It is sectional drawing which follows the 7-7 line | wire of FIG. It is sectional drawing which shows the metal mold | die which installed the spacer and the flat battery inside. It is sectional drawing which shows the time of clamping a metal mold | die. It is sectional drawing which shows the time of carrying out insert molding of the joining member inside the metal mold | die. It is sectional drawing which shows the time of installing a spacer and a flat battery in the metal mold | die in 2nd Embodiment. It is sectional drawing which shows the time of carrying out insert molding of the joining member inside the metal mold | die in 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation, and are different from the actual ratios.

<First Embodiment>
Referring to FIGS. 1 and 2, a battery module 100 includes a cell unit 130 including a plurality of flat batteries 10 (corresponding to secondary batteries) inside a case 120, and an insulating cover having electrical insulation. 140 is housed. The battery module 100 can be used alone. For example, by forming a plurality of battery modules 100 in series and / or in parallel, an assembled battery corresponding to a desired current, voltage, and capacity is formed. be able to.

  The case 120 includes a lower case 122 having a substantially rectangular box shape and an upper case 124 forming a lid. The edge of the upper case 124 is wound around the edge of the peripheral wall of the lower case 122 by caulking. The lower case 122 and the upper case 124 are formed from a relatively thin steel plate or aluminum plate. The lower case 122 and the upper case 124 have a through hole 126. The through holes 126 are arranged at four corners, and are used to insert through bolts (not shown) for stacking a plurality of battery modules 100 and holding them as an assembled battery. Reference numerals 131 and 132 are output terminals arranged so as to protrude from the opening on the front surface of the lower case 122.

  Referring to FIG. 2, cell unit 130 includes a stacked body 133 in which a plurality of flat batteries 10 are electrically connected and stacked, a plurality of spacers 20 and 30 for supporting the batteries, and each of the flat batteries. A joining member 40 joining the spacers 20 and 30 to the battery 10 is provided. The spacers 20 and 30 are not limited as long as the spacers 20 and 30 have electrical insulation and have the required strength. For example, an electrical insulation resin material such as polypropylene can be used. The spacer 20 is disposed on the front side of the stacked body 133, and the spacer 30 (corresponding to a positioning member) is disposed on the back side of the stacked body 133.

  With reference to FIG. 3, the flat battery 10 is, for example, a lithium ion secondary battery, and the laminated electrode body 50 is accommodated in the exterior member 11 together with the electrolytic solution. The flat battery 10 has electrodes (hereinafter referred to as “tabs”) 14 and 15 led out from the exterior member 11 to the outside.

The laminated electrode body 50 is formed by sequentially laminating a positive electrode 51, a negative electrode 52, and a separator 53. The positive electrode 51 has a positive electrode active material layer made of a lithium-transition metal composite oxide such as LiMn ₂ O ₄ . The negative electrode 52 has a negative electrode active material layer made of carbon and a lithium-transition metal composite oxide, for example. The separator 53 is made of, for example, porous PE (polyethylene) having air permeability that can permeate the electrolyte.

  The exterior member 11 is a sheet such as a polymer-metal composite laminate film in which a metal (including an alloy) such as aluminum, stainless steel, nickel, or copper is covered with an insulator such as a polypropylene film from the viewpoint of weight reduction and thermal conductivity. Made of material. The exterior member 11 has a main body portion 12 that covers the laminated electrode body 50 and an outer peripheral portion 13 that extends to the periphery of the main body portion 12. Part or all of the outer peripheral portion 13 is joined by heat fusion. In the outer peripheral portion 13 of the exterior member 11, a hole portion 17 is formed at a portion connected to the spacers 20 and 30.

  The tabs 14 and 15 are members for drawing current from the laminated electrode body 50 and extend to the front side of the flat battery 10.

  Referring to FIG. 4, the spacer 30 includes a pin 32 that penetrates through two holes 17 formed in the outer peripheral portion 13 of the exterior member 11 of the flat battery 10. The spacer 30 has through holes 31 at both ends in the longitudinal direction. The through hole 31 is aligned with the through hole 126 on the back side of the lower case 122 and the upper case 124 and is used to insert a through bolt. In FIG. 4, in order to show the positional relationship between the spacer 30 and the flat battery 10, the description of the joining member 40 that joins the spacer 30 and the flat battery 10 is omitted.

  Referring to FIG. 5, the plurality of spacers 30 are joined to the flat battery 10 by the material of the joining member 40 in which the hot melt adhesive is cured. The joining member 40 covers the edge of the outer peripheral portion 13 located between the spacer 30 and the spacer 20 and also serves as a reinforcing member and an insulating member.

  The hot melt adhesive is an adhesive that can be melted and flowed by heating, and is cured by cooling to room temperature, and is composed of, for example, a thermoplastic synthetic resin or rubber as a main raw material. In the present embodiment, as a hot-melt adhesive, an adhesive mainly made of a polyamide-based thermoplastic resin is used.

  Referring to FIGS. 5 to 7, the through hole 31 of the spacer 30 is formed to be surrounded by a sleeve 34 protruding from the surrounding flat surface 33 (surface), and a part of the circumferential direction is formed on the sleeve 34. A cutout portion 35 is formed. The notch 35 allows the flat surface 33 to communicate directly with the through hole 31 without passing through the wall surface of the sleeve 34. The notch 35 is generated by ensuring the battery area as large as possible while ensuring the hole diameter of the through-hole 31 for the through bolt while the size of the entire cell unit 130 is restricted by the size of the case 120. Is. Note that the notch 35 may be formed for other purposes.

  On the flat surface 33, a convex portion 36 is formed so as to surround the outer periphery of the notch portion 35 so as to face the notch portion 35 and extend on a line. The length L of the convex part 36 is formed longer than the width W of the notch part 35. Moreover, the convex part 36 is formed in the linear shape which makes the side facing the notch part 35 concave. The convex portion 36 has, for example, a height H of 0.1 mm and a width D of 0.2 mm, but is not limited thereto.

  In addition, the spacer 30 includes a stepped portion 37 that is lowered by one step from the flat surface 33, and the outer peripheral portion 13 of the exterior member 11 and the joining member 40 are located on the stepped portion 37. The spacer 30 and the flat battery 10 are joined by the joining member 40 formed by allowing the hot melt adhesive to flow into the stepped portion 37 and then curing it. The convex part 36 is formed on the flat surface 33 between the step part 37 and the notch part 35.

  Next, a method for joining the spacer 30 and the flat battery 10 will be described.

  Referring to FIG. 8, when joining spacer 30 and flat battery 10 by joining member 40, spacer 30 and flat battery 10 are installed in mold 200, and joining member 40 is insert-molded. It is done by doing. Although not shown in the drawing, the spacer 20 is also joined to the flat battery 10 by the joining member 40 in the mold 200.

  The mold 200 includes a first mold 210 and a second mold 220, and a hot melt adhesive that is heated and melted can be injected into the mold 200.

  First, with the pin 32 of the spacer 30 penetrating through the hole 17 of the flat battery 10 between the first mold 210 and the second mold 220, the spacer 30 and the spacer 20 together with the flat battery 10 are combined. Accommodate. The spacers 30 are prepared by overlapping a plurality of sheets, and are transported one by one from here by a robot arm or the like. However, since the protrusions 36 are formed on the spacers 30, A gap is secured between them, and the surfaces do not contact each other. Accordingly, when only one sheet is taken out from the plurality of stacked spacers 30, it is possible to prevent other spacers 30 below from being conveyed together due to negative pressure or static electricity.

  Referring to FIG. 9, after housing spacer 30, spacer 20, and flat battery 10 between first mold 210 and second mold 220, first mold 210 and second mold 220 are placed together. When the mold is clamped, an inflow space 201 into which the hot melt adhesive flows is formed. The step portion 37 of the spacer 30 is positioned in the inflow space 201, and the flat surface 33 of the spacer 30 contacts the contact surface 211 of the first mold 210 without being positioned in the inflow space 201.

  At this time, the convex portion 36 of the flat surface 33 of the spacer 30 is crushed by the contact surface 211 of the first mold 210 and is elastically deformed to be substantially flat. Therefore, the entire surface of the flat surface 33 comes into contact with the contact surface 211 of the first mold 210 without causing a gap between the flat surface 33 and the contact surface 211 by the convex portion 36. And in the site | part which the convex part 36 is deform | transforming, a surface pressure stronger than the surrounding surface generate | occur | produces. In addition, it is preferable that the height H of the convex portion 36 is 0.1 mm or less so that no gap is generated between the flat surface 33 and the contact surface 211 of the first mold 210. 0.1 mm or more.

  Referring to FIG. 10, when the hot melt adhesive is injected into the inflow space 201, almost the entire flat surface 33 is in contact with the contact surface 211 of the first mold 210. Never flows in. In addition, since the convex portion 36 of the flat surface 33 is in contact with the contact surface 211 of the first mold 210 with a strong surface pressure, the flat surface 33 is in contact with the contact surface 211 due to various factors such as dimensional errors. Even if the hot melt adhesive flows in, the convex portion 36 can prevent the hot melt adhesive from reaching the through hole 31 via the notch 35. Furthermore, since the convex part 36 is formed in the linear shape which makes the side facing the notch part 35 concave, it can suppress that a hot-melt-adhesive agent wraps around the convex part 36 and reaches the through-hole 31. FIG. Therefore, it is possible to prevent the hot melt adhesive from being hardened inside the through hole 31 and making it impossible to pass the bolt through the through hole 31.

  Thereafter, when the hot melt adhesive is cooled in the mold 200, the hot melt adhesive is cured, and the joining member 40 for joining the spacer 30 and the spacer 20 to the flat battery 10 is formed.

  As described above, the spacer 30 according to the present embodiment has the convex portion 36 that extends linearly facing the notch portion 35 of the sleeve 34 on the flat surface 33, and therefore, the spacer 30 is made of hot melt adhesive. When the battery 10 and the flat battery 10 are joined, the hot melt adhesive can be prevented from flowing into the through hole 31. For this reason, it is possible to prevent the through bolt from passing through the through hole 31.

  In addition, since the length L in the extending direction of the convex portion 36 on the flat surface 33 is longer than the width W of the cutout portion 35, it is possible to more reliably suppress the inflow of the hot melt adhesive into the through hole 31. it can.

  Further, since the height H from the flat surface 33 of the convex portion 36 is 0.1 mm or less, no gap is generated by the convex portion 36 between the first mold 210 and the contact surface 211 in contact with the flat surface 33. Therefore, it is possible to suppress the hot melt adhesive from adhering to the flat surface 33 while suppressing the inflow of the hot melt adhesive into the through hole 31.

Second Embodiment
In 2nd Embodiment, the convex part is provided in the metal mold | die instead of providing a convex part in a spacer.

  Referring to FIG. 11, the spacer 60 has the same configuration as that of the spacer 30 in the first embodiment, except that no convex portion is formed on the flat surface 63.

  The mold 300 has the same configuration as the mold 300 in the first embodiment, except that a convex portion 312 is formed on the contact surface 311 of the first mold 310. The convex portion 312 is formed to extend on a line so as to face the notch 65 so as to surround the outer periphery of the notch 65 formed in the sleeve 64 of the spacer 60 when the mold is clamped. The length of the convex part 312 is formed longer than the width of the notch part 65. The convex portion 312 is formed to extend in a curved shape having a concave shape on the side facing the notch portion 65. That is, the convex part 312 is formed in the shape and dimension corresponding to the convex part 36 of the spacer 30 in 1st Embodiment. The convex portion 312 has a height of 0.1 mm and a width of 0.2 mm, for example, but is not limited thereto.

  Referring to FIG. 11, after housing the spacer 60, the spacer 20, and the flat battery 10 between the first mold 310 and the second mold 320, the first mold 310 and the second mold 320 are mounted. When the mold is clamped, an inflow space 301 into which the hot melt adhesive flows is formed. The step portion 67 of the spacer 60 is located in the inflow space 301, and the flat surface 63 of the spacer 60 abuts against the abutment surface 311 of the first mold 310 without being located in the inflow space 301.

  At this time, the convex portion 312 of the contact surface 311 is pushed into the flat surface 63 of the spacer 60 so that the flat surface 63 is elastically deformed. Accordingly, the entire surface of the flat surface 63 comes into contact with the contact surface 311 of the first mold 310 without causing a gap between the flat surface 63 and the contact surface 311 by the convex portion 312. And in the site | part which the convex part 312 has digged in, a surface pressure stronger than the surrounding surface generate | occur | produces. The height of the convex portion 312 is preferably 0.1 mm or less so that no gap is generated between the flat surface 63 and the contact surface 311 of the first mold 310. It may be 0.1 mm or more.

  Thereafter, when the hot melt adhesive is injected into the inflow space 301, the entire surface of the flat surface 63 is in contact with the contact surface 311 of the first mold 310, so that the hot melt adhesive flows into the notch 65. Absent. Moreover, since the convex portion 312 of the contact surface 311 is in contact with the flat surface 63 with a strong surface pressure, the hot melt adhesive flows between the contact surface 311 and the flat surface 63 due to various factors such as dimensional errors. Even so, the convex portion 312 can suppress the hot melt adhesive from reaching the through hole 31 via the notch 65. Furthermore, the convex portion 312 is formed in a linear shape having a concave shape on the side facing the notch 65, and the hot melt adhesive can be prevented from reaching the through hole 61 around the convex portion 312. As a result, it is possible to prevent the hot melt adhesive from being cured at the through hole 31 so that the bolt cannot be passed through the through hole 31.

  Thereafter, when the hot melt adhesive is cooled in the mold 300, the hot melt adhesive is cured, and the joining member 40 for joining the spacer 60 and the spacer 20 to the flat battery 10 is formed.

  As described above, the mold 300 according to the second embodiment has the convex portion 312 that extends linearly facing the notch 65 on the contact surface 311 that contacts the flat surface 63 of the spacer 60. When the spacer 60 and the flat battery 10 are joined by the hot melt adhesive, the hot melt adhesive can be prevented from flowing into the through hole 61. For this reason, it is possible to prevent the through bolt from passing through the through hole 61.

  In addition, since the length of the protruding portion 312 in the extending direction on the contact surface 311 is longer than the width of the notch portion 65, the inflow of the hot melt adhesive into the through hole 31 can be more reliably suppressed. .

  In addition, since the height of the convex portion 312 from the contact surface 311 is 0.1 mm or less, there is no gap generated by the convex portion 312 between the flat surface 63 and the contact surface 311. It is possible to suppress the hot melt adhesive from adhering to the flat surface 63 while suppressing the flow of the hot melt adhesive through hole 31 into the flat surface 63.

(Modification example)
The present invention is not limited to the above-described embodiment, and can be modified as appropriate. For example, although the flat battery 10 in which both the positive and negative tabs 14 and 15 are arranged on one side of the exterior member 11 is shown, it goes without saying that the present invention can be applied to a secondary battery in which positive and negative tabs are arranged on different sides. Further, the length L of the convex portion 36 may be shorter than the width W of the notch portion 35. Further, the flat surface 33 is not necessarily a flat surface, and may be a curved surface, for example. Further, when a notch is formed in the through hole of the spacer 20 on the front side, a convex portion may be formed on the spacer 20.

10 flat battery,
11 Exterior member,
30, 60 spacer (positioning member),
31 through hole,
33, 63 flat surface (surface),
34, 64 sleeves,
35, 65 notch,
36 convex part,
40 joining members,
300 molds,
311 contact surface,
312 convex part,
H Height of the convex part,
L The length of the convex part,
W The width of the notch.

Claims (6)

A positioning member that is attached to a flat battery in which a power generation element is sealed with an exterior material and has a through hole for positioning the flat battery,
A sleeve that protrudes from the surrounding surface so as to surround the through-hole and has a notch formed in a part in the circumferential direction;
A positioning member having a convex portion extending linearly on the surface so as to face the notch portion.   The positioning member according to claim 1, wherein the convex portion has a length in an extending direction on the surface longer than a width of the notch portion.   The positioning member according to claim 1, wherein the convex portion has a height from the surface of 0.1 mm or less. A state in which a flat battery in which a power generation element is sealed with an exterior material and a positioning member that includes a sleeve that protrudes from a surrounding surface so as to surround a through-hole and that has a notch in a circumferential direction are accommodated A mold for injecting a hot melt adhesive to join the flat battery and the positioning member,
The metal mold | die which has a convex part extended in a line | wire so that it may oppose to the said notch part when the mold is clamped on the contact surface contact | abutted with the said surface of the said positioning member.   The mold according to claim 4, wherein the convex portion has a length in an extending direction on the contact surface longer than a width of the notch portion.   The mold according to claim 4 or 5, wherein the convex portion has a height of 0.1 mm or less from the contact surface.

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