JP2011222198A - Method of manufacturing battery having surface covered with heat-shrinkable film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a battery surface and efficiently cover with a heat-shrinkable film without exposing the surface which needs insulation.SOLUTION: In a method of manufacturing a battery having the surface covered with a heat-shrinkable film, the battery 1 is inserted into a heat-shrinkable bag 20 obtained by forming the heat shrinkable film 2 shrunk by being heated into a bag shape, and the heat-shrinkable bag 20 is heated and shrunk to be brought into close contact with the surface of the battery 1. In this manufacturing method, for protrusions 23 protruding from the battery 1 to be inserted which are located at openings 22, opening lock bags 20X are used, which have through-holes 24, as the heat shrinkable bag 20 into which the battery 1 is inserted. Furthermore, in the method of manufacturing the battery, the battery 1 is inserted into these opening lock bags 20X, and the opening lock bags 20 are heated and thermally shrunk in a state where rods 3 are inserted into the through-holes 24.

Description

  The present invention relates to a manufacturing method of a battery whose surface is covered with a heat shrink film, and more particularly to a manufacturing method optimal for manufacturing a battery having a heat shrink film as an insulating film and insulating the surface of the battery.

  In a power supply device in which a large number of batteries are arranged close to each other, a short circuit due to contact between adjacent batteries can be prevented by insulating the surface of the battery. Further, the battery can be protected by coating the surface of the battery. In order to realize this, a method of coating the surface of the battery with a heat shrink film has been developed. (See Patent Document 1)

Japanese Patent Laid-Open No. 2003-223872

  Patent Document 1 describes a battery manufacturing method in which a battery is inserted into a heat shrink film bag and heated to shrink the heat shrink film. In this method, the heat-shrinkable film is formed into a bag shape, or has a shape in which both ends are opened. A battery is inserted into the heat-shrinkable film, and is heat-shrinked to adhere to the battery surface. The method of covering with a heat-shrinkable film can surely insulate as compared with the method of coating the surface of the battery. However, this method is difficult to cover so as not to expose the surface that needs to be insulated. This is because the heat shrinkable film shrinks to expose the battery surface.

The present invention has been developed for the purpose of solving this drawback. An important object of the present invention is to provide a battery manufacturing method capable of stably covering a battery surface without exposing a surface that needs to be insulated.
Furthermore, another important object of the present invention is to provide a method for manufacturing a battery that can be efficiently covered with a heat shrinkable film without exposing a surface that needs to be insulated.

Means for Solving the Problems and Effects of the Invention

  In the manufacturing method of a battery in which the surface of the present invention is covered with a heat shrinkable film, the battery 1 is inserted into a heat shrinkable bag 20 having a heat shrinkable film 2 that shrinks when heated, and the heat shrinkable bag 20 is heated. Then, this is contracted and brought into close contact with the surface of the battery 1. In this manufacturing method, as the heat-shrink bag 20 into which the battery 1 is inserted, a protrusion 23 protruding from the battery 1 to be inserted is in the opening 22, and the opening locking bag having a through hole 24 in the protrusion 23. Use 20X. Further, in the battery manufacturing method, the battery 1 is inserted into the opening portion locking bag 20X, and the opening portion locking bag 20X is heated and contracted while the rod 3 is inserted into the through hole 24.

  The battery manufacturing method described above is characterized in that the surface of the battery can be stably and efficiently covered with the heat-shrinkable film without exposing the surface that needs to be insulated. This manufacturing method uses an opening locking bag having a protruding portion protruding from the battery at the opening as a heat shrink bag covering the battery, and an opening locking bag having a through hole in the protruding portion. This is because the battery is inserted into the stop bag and the opening locking bag is heated and thermally contracted with the rod inserted into the through hole. This manufacturing method restricts the amount of exposure of the battery surface exposed from the opening by constraining the position of the opening of the opening locking bag that is thermally contracted by the rod inserted into the through hole of the protrusion. It is possible to reliably prevent exposure of surfaces that require insulation. For this reason, the feature which can coat | cover a battery surface with a heat shrink film efficiently is realizable, without exposing the surface which needs insulation.

In the battery manufacturing method of the present invention, the battery 1 can be the rectangular battery 10.
In this manufacturing method, the heat-shrinkable film is covered along the outer peripheral surface of the prismatic battery whose outer shape is rectangular, and the surface that needs insulation can be reliably prevented from being exposed.

In the battery manufacturing method of the present invention, the opening portion locking bag 20 </ b> X can be provided with the protruding portions 23 on both sides of the opening portion 22.
In this manufacturing method, a rod is inserted into the protrusions provided on both sides of the opening of the opening locking bag, and the position of the opening of the heat shrink bag is constrained by this rod. Is prevented from being exposed more than necessary from the opening locking bag, and the battery surface can be stably coated. In particular, by constraining both sides of the opening latching bag into which the square battery is inserted with a rod, the heat shrinkable film can be heat shrunk in a well-balanced manner and the battery surface can be covered with good appearance.

In the battery manufacturing method of the present invention, the sealing plate 12 of the battery 1 can be disposed in the opening 22 of the opening latching bag 20X, and the battery 1 can be inserted into the opening latching bag 20X.
In this manufacturing method, the battery sealing plate is covered with the battery surface heat shrink film while being exposed from the opening of the heat shrink bag, so that the opening of the safety valve and the output terminal arranged on the sealing plate are heat shrunk. It can be exposed to the outside without being covered with a film.

In the battery manufacturing method of the present invention, the through hole 24 of the opening portion locking bag 20X can be made circular.
In this manufacturing method, the battery surface can be covered by stably heat-shrinking the heat-shrinkable film while holding the rod inserted into the through hole at a fixed position.

The battery manufacturing method of the present invention can heat-shrink the opening latching bag 20X formed by inserting the battery 1 from the bottom toward the opening 22.
This manufacturing method heat-shrinks the opening latch bag in which the battery is inserted from the bottom toward the opening, so that it is effective to create air bubbles and wrinkles between the heat-shrink film and the battery surface. Can be prevented. Thereby, the battery surface can be covered with a heat shrink film with good appearance.

In the battery manufacturing method of the present invention, the opening locking bag 20X into which the battery 1 is inserted can be heated and thermally contracted in a state of being suspended by the rod 3.
In this manufacturing method, since the opening latch bag in which the battery is inserted is suspended from the rod, the opening latch bag can be held in the air and heated in a non-contact state. Can be heat-shrinked in a well-balanced manner to adhere to the battery surface. In particular, the outer peripheral surface of the opening latch bag can be heat-shrinked while being held in a posture of pulling downward by its own weight, so the heat-shrinkable film is effectively shrunk while effectively preventing the heat-shrink film from being wrinkled. Can be coated well.

In the battery manufacturing method of the present invention, the opening latching bag 20X suspended from the rod 3 can be put into the heating furnace 4 from the bottom, and the opening latching bag 20X can be thermally contracted from the bottom.
In this manufacturing method, the opening latch bag in which the battery is inserted is suspended from the rod and heated in the heating furnace from the bottom, so that the outer peripheral surface of the opening latch bag is lowered downward by its own weight. While maintaining the pulling posture, the opening portion locking bag can be thermally contracted from the bottom portion toward the opening portion. For this reason, the heat shrinkable film can be uniformly heat-shrinked in a well-balanced manner and the battery surface can be covered beautifully while reliably preventing air bubbles and wrinkles between the heat shrinkable film and the battery surface.

In the battery manufacturing method of the present invention, a plurality of opening portion locking bags 20X into which the battery 1 is inserted are arranged in parallel, the rod 3 is inserted into the through hole 24 of each opening portion locking bag 20X, The shrink film 2 can be heated and thermally shrunk.
In this manufacturing method, a plurality of batteries can be efficiently manufactured because the plurality of opening locking bags can be inserted in the rods in parallel and the surfaces of the plurality of batteries can be covered with the heat-shrinkable bags.

The battery manufacturing method of the present invention can remove the protrusion 23 from the battery 1 after the opening latching bag 20X is heated and thermally contracted.
In this manufacturing method, since the protrusion is removed after the battery surface is covered with the heat-shrinkable opening latch bag, the appearance of the battery whose surface is covered with the heat-shrinkable film can be cleaned.

It is a perspective view which shows the process of coat | covering the surface of a battery with a heat shrink film with the manufacturing method concerning one Example of this invention. It is a perspective view which shows the state which inserted the battery in the opening part latching bag shown in FIG. 1, and inserted the rod in the opening part. It is a front view of the opening part latching bag in which the battery shown in FIG. 2 was inserted. It is the IV-IV sectional view taken on the line of the opening part latching bag in which the battery shown in FIG. 3 was inserted. It is a perspective view which shows the state which heated and shrunk the opening part latching bag shown in FIG. It is a perspective view which shows the state which removed the protrusion from the opening part latching bag shown in FIG. It is a perspective view which shows the manufacturing process of the opening part latching bag shown in FIG. It is a perspective view which shows the manufacturing process of the opening part latching bag concerning another Example. It is a perspective view which shows another example of an opening part latching bag. It is a perspective view which shows another example of an opening part latching bag. It is a perspective view which shows another example of an opening part latching bag. It is a principal part expanded sectional view which shows the state which heats an opening part latching bag and heat-shrinks a heat-shrink film. It is a principal part expanded sectional view which shows the state which the heat-shrink film of the opening part latching bag shown in FIG. 12 heat-shrinked. It is a perspective view which shows another example which heats an opening part latching bag and heat-shrinks a heat-shrink film. It is sectional drawing which shows the state which hangs several opening part latching bags from a rod, and coat | covers the surface of a battery with a heat shrink film. It is sectional drawing which shows the state which inserts an opening part latching bag in a heating furnace and heat-shrinks a heat-shrink film. It is sectional drawing which shows the state which the opening part latching bag inserted in the heating furnace thermally contracted.

  Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify a battery manufacturing method in which the surface for embodying the technical idea of the present invention is covered with a heat-shrinkable film. The following methods are not specified.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The process of coating the surface of the battery with a heat shrink film by the production method of the present invention is shown in FIGS. In the battery manufacturing method shown in these drawings, the battery 1 is inserted into a heat-shrinkable bag 20 having a heat-shrinkable film 2 that shrinks when heated, and the heat-shrinkable bag 20 into which the battery 1 is inserted is heated. The heat shrink film 2 is heat shrunk to adhere to the battery surface, and the surface of the battery 1 is covered with the heat shrink film 2.

[Battery 1]
The battery 1 is a rectangular battery 10 having a rectangular outer shape that is thinner than a width. In this rectangular battery 10, an electrode body (not shown) is inserted into a bottomed and cylindrical metal outer can 11, and the opening of the outer can 11 is closed with a sealing plate 12. Further, the battery 1 has an output terminal 13 fixed to the sealing plate 12 in order to output to the outside from the electrode body housed in the outer can 11. The battery 1 shown in the figure has positive and negative output terminals 13 at both ends of a sealing plate 12. One of the positive and negative output terminals 13 is connected to the positive electrode plate of the electrode body, and the other is connected to the negative electrode plate of the electrode body. These output terminals 13 are fixed to the sealing plate 12 via insulating members 14, and the output terminals 13 are insulated from the sealing plate 12 and the outer can 11. However, the battery is not necessarily provided with two output terminals on the sealing plate. The battery connects either the positive electrode plate or the negative electrode plate of the electrode body to the output terminal and fixes it to the sealing plate in an insulated state, and connects the other of the positive electrode plate and the negative electrode plate to the outer can or the sealing plate for output. It can also be a terminal. Furthermore, the battery 1 shown in the figure has a safety valve opening 15 at the center of the sealing plate 12.

  The battery 1 is a lithium ion secondary battery. However, the battery is not specified as a lithium ion secondary battery. The present invention can be applied to the production of all batteries whose surface is covered with a heat shrink film regardless of whether the battery is a secondary battery or a primary battery. Therefore, the battery can be a secondary battery such as a nickel metal hydride battery or a nickel cadmium battery, or a primary battery such as a manganese battery, an alkaline battery, or a lithium battery. Further, the battery is not limited to a rectangular battery, and can be a columnar battery whose cross-sectional shape is circular, oval, or elliptical.

  When the battery 1 is inserted into the heat shrink bag 20, the heat shrink bag 20 is heated, and the battery surface is covered with the heat shrink film 2 that heat shrinks, so that necessary portions of the battery surface are insulated. . The part that requires insulation on the battery surface is mainly the entire surface of the outer can 11. However, the battery does not cover the entire outer can, but covers and insulates almost the entire surface except for the open end. In addition to the entire surface of the outer can, the battery covers a part of the outer periphery of the sealing plate. And can be insulated. However, since the sealing plate 12 is provided with the opening 15 and the output terminal 13 of the safety valve as described above, these portions are exposed to the outside without being covered with the heat shrink film 2.

[Heat Shrink Bag 20]
The heat shrink bag 20 is formed by forming a heat shrink film 2 that shrinks when heated into a bag shape into which the battery 1 can be inserted. The heat shrinkable film 2 is preferably a plastic sheet having heat shrinkability, for example, a sheet made of PET. A PET sheet is preferable because it is excellent in heat resistance and durability, is inexpensive, and can be easily bonded by thermal welding. However, the heat-shrinkable film is not limited to a PET sheet, and other plastic sheets having heat-shrinkability and insulating properties can also be used.

  The heat-shrinkable bag 20 made of the heat-shrinkable film 2 is formed into a bag shape with one end opened, and has a storage portion 21 into which the battery 1 can be inserted. Since the heat-shrinkable bag 20 shown in the figure accommodates the rectangular battery 1, the entire shape is rectangular and an opening 22 is provided at one end. The heat-shrinkable bag 20 is formed into a bag shape by cutting the heat-shrinkable film 2 formed into a cylindrical shape into a predetermined length as shown in FIG. 7, for example, and bonding the cut ends linearly. The Alternatively, as shown in FIG. 8, the heat-shrinkable bag 20 is formed by folding the heat-shrinkable film 2 cut into a rectangular sheet into two at the center and laminating them, and bonding the both side edges to form a bag-like shape. You can also

  The heat-shrinkable bag 20 has an inner shape and depth that allow the battery 1 to be inserted therein, and is formed in a size that allows a necessary portion to be covered with the heat-shrinkable film 2. That is, the heat-shrinkable bag 20 is sized to accommodate the outer can 11 of the battery 1 and covers the battery surface without exposing necessary portions even when the heat-shrinkable film 2 shrinks and shrinks. It has the size that can be. The heat-shrinkable bag 20 shown in the figure is inserted so that the rectangular battery 10 having a thickness smaller than the width is inserted to cover the surface thereof, so that the opposing surface 20a of the heat-shrinkable bag 20 is formed to be larger than both surfaces of the battery 1. is doing. Further, the heat shrink bag 20 is formed with gussets 20b on both sides when the thick rectangular battery 10 is accommodated. Therefore, as shown in FIG. 1, the heat shrink bag 20 has a lateral width (W) of the storage portion 21 larger than the lateral width (L) of the battery 1, and the width (t) of the gusset 20 b on both sides of the storage portion 21. Is larger than the thickness (d) of the battery 1, and the depth (D) of the storage portion 21 is larger than the height (H) of the battery 1. The rate at which the storage portion 21 of the heat-shrinkable bag 20 is larger than the outer shape of the battery 1 varies depending on the rate at which the heat-shrinkable film 2 is thermally shrunk. For example, the width (W) of the storage portion 21 is changed to the width of the battery 1 ( L) 1.05-1.3 times the width of the gusset 20b (t) 1.0-1.2 times the thickness (d) of the battery 1, and the depth (D ) Is 1.05 to 1.2 times the height (H) of the battery 1.

  Further, the heat-shrinkable bag 20 shown in FIGS. 1 to 5 is provided with a protruding portion 23 protruding from the battery 1 in the opening portion 22 in a state in which the battery 1 is accommodated therein, and a through hole 24 is opened in the protruding portion 23. And it is set as the opening part latching bag 20X. As shown in FIG. 3 to FIG. 5, the opening locking bag 20 </ b> X in which the protruding portion 23 is provided in the opening 22 is inserted with the rod 3 in the through hole 24 of the protruding portion 23, as shown in FIGS. 3 to 5. The rod 3 is inserted to constrain the position of the opening 22 of the opening locking bag 20X, and the heat-shrinkable film 2 that heat-shrinks by heating covers the exact position of the battery surface.

  The opening portion locking bag 20 </ b> X shown in the figure has protrusions 23 on both sides of the opening portion 22. The opening portion locking bag 20 </ b> X in the figure has a notch recess 25 formed by notching the central portion of the opening 22 in the width direction in a U-shape, and is provided outside the notch recess 25 and on both sides of the opening 22. The protrusion 23 is left without being cut out. The notch recess 25 has a bottom edge that is notched in a straight line along the upper edge of the battery 1 to form an opening edge 26. The opening locking bag 20X protrudes from the upper surface of the battery 1 inserted into the opening locking bag 20X with the portion protruding from the opening edge 26 of the cutout recess 25 as a protruding portion 23.

  The protruding portion 23 in the figure is U-shaped in a shape along the side portion of the battery 1, and is provided with opening through holes 24 at both ends facing each other. That is, the protruding portion 23 includes a gusset portion 23B that becomes the gusset 20b of the heat shrink bag 20 in a state in which the battery 1 is inserted, and a locking portion 23A that is connected to both ends of the gusset portion 23B and faces each other. The through hole 24 is opened in the locking portion 23A. These through holes 24 are provided so as to be located outside the output terminals 13 provided on the sealing plate 12 of the battery 1 inserted into the opening portion locking bag 20X. The through holes 24 provided in the protruding portion 23 are opened at positions facing each other so that the rod 3 can be inserted linearly.

The opening portion locking bag 20X shown in FIGS. 1 and 2 is manufactured as follows.
(1) As shown to (a) of FIG. 7, the heat-shrink film 2 shape | molded by the cylinder shape is cut | judged by appropriate length.
(2) As shown in FIG. 7B, one opening end of the cut cylindrical heat-shrink film 2 is linearly bonded and closed, and the entire shape is formed into a bag shape. .
(3) As shown in FIG. 7C, the opening 22 of the heat-shrinkable bag 20 formed into a bag shape is cut, and a protrusion 23 protruding from the battery 1 to be inserted is provided in the opening 22. At the same time, the through hole 24 is opened in the projecting portion 23 to mold the opening portion locking bag 20X.

The opening part latching bag 20X shown in FIG. 8 is produced as follows.
(1) As shown to (a) of FIG. 8, the center of the sheet-like heat-shrink film 2 is made into the V-shape by making the center into the folding line 29, and is laminated | stacked.
(2) As shown in FIG. 8 (b), both side edges of the folded heat-shrinkable film 2 are bonded to form the entire shape into a bag shape.
(3) As shown in FIG. 8C, the opening 22 of the heat-shrinkable bag 20 formed into a bag shape is cut, and a protrusion 23 protruding from the battery 1 to be inserted is provided in the opening 22. At the same time, the through hole 24 is opened in the projecting portion 23 to mold the opening portion locking bag 20X.

  In addition, the opening part latching bag 20X shown above forms the bottom part by adhere | attaching the end of the cylindrical heat shrink film 2 linearly, or the both-sides edge part of the heat shrink film 2 folded and laminated | stacked in the center Are adhered in a straight line to form a side portion. The opening locking bag 20X molded in this way can be molded most easily into a bag shape because the bottom and side edges are bonded linearly. In addition, since the bottom and side edges are bonded in a straight line to make the entire outer shape square, there is also a feature that the storage portion 21 formed inside can be easily shaped along the outer shape of the prismatic battery 10. However, the heat-shrinkable bag can also be bonded in a curved line at the corners on both sides of the bottom. The heat-shrinkable film 2 can be fixed by other methods such as an adhesive in addition to being bonded by thermal welding at the bonded portion. Furthermore, although the opening portion locking bag is not shown, the bottom portion and the side portion are formed in a U shape or a U shape so as to match the outer peripheral shape of the square outer can, Adhesion with the outer can can be further enhanced.

  Further, in the opening portion locking bag 20X shown in FIGS. 7 and 8, a portion to which the heat shrink film 2 is bonded protrudes from the bottom surface in FIG. 7, and protrudes from the side surface in FIG. However, the opening portion locking bag can be removed by cutting the adhesive portion. In addition, when leaving this adhesion part in the bottom face or side surface of the opening part latching bag 20X, it is preferable that an adhesion part is located in the approximate center of the thickness direction of the outer can 11. Thereby, when the opening part latching bag 20X formed by inserting the battery 1 is heated to heat-shrink the heat-shrinkable film 2, the opposing surfaces 20a of the heat-shrinkable film 2 located on both surfaces of the battery 1 are uniformly heat-shrinked. The surface of the outer can 11 can be covered.

  Furthermore, as shown in FIG. 9, the opening portion locking bag 20 </ b> X can be configured by only the locking pieces 23 </ b> C protruding from the opening edge 26 without providing a gusset portion on the protruding portions 23 provided on both sides. This opening portion locking bag 20X is also provided with a notch recess 25 on both sides of the heat shrink bag 20 facing the gusset 20b, and a notch recess 25 provided at the center and a notch recess 25 provided on both sides. A locking piece 23 </ b> C protruding from the opening edge 26 is provided therebetween to form the protruding portion 23. The protrusions 23, which are a pair of locking pieces 23C provided on both sides, are arranged at positions facing each other. Further, the projecting portions 23 facing each other are provided with open through holes 24 facing each other outside the output terminal 13 so that the rod 3 can be inserted linearly.

  As described above, the structure in which the protrusions 23 are provided on both sides of the opening locking bag 20X and the rods 3 are inserted through these protrusions 23 is the heat shrink bag 20 and the battery on the upper surface of both sides of the battery 1. Since the relative position of 1 is specified, the position of the opening 22 of the opening locking bag 20X can be stably restrained and the heat shrinkable film 2 can be covered at an accurate position with the simplest structure. .

  Furthermore, as shown in FIG. 10, the opening portion locking bag 20 </ b> X can be provided with a protruding portion 23 that protrudes from the battery 1 in the center portion in addition to the both side portions. The protrusion 23 provided at the center is provided between the pair of output terminals 13 provided on the sealing plate 12. Since this structure can restrain the position of the opening part 22 of the opening part latching bag 20X also in the center part in addition to both side parts, there exists the characteristic which can coat | cover the heat shrink film 2 in a more exact position. The opening portion locking bag 20X shown in the figure has a pair of opposed protruding portions 23 at the center portion, but the opening portion locking bag can also have a plurality of sets of protruding portions at the center portion. Furthermore, although not shown, the opening portion locking bag can be provided with a protruding portion only at the central portion, and the position of the opening portion of the heat shrinkable bag can be constrained by a rod inserted through the protruding portion.

  Furthermore, the opening portion locking bag 20X shown in FIG. 11 has the entire opening portion 22 of the heat shrink bag 20 as a protruding portion 23 that protrudes from the battery 1, and a pair of penetrating holes at opposite positions on both sides of the protruding portion 23. A hole 24 is opened. The opening portion locking bag 20 </ b> X having this shape also constrains the position of the opening portion 22 to a predetermined position of the battery 1 by inserting the rod 3 into the opposing through hole 24.

  The protrusion 23 opens a circular through hole 24. The circular through hole 24 can stably hold the inserted rod 3 in a fixed position, reduce deformation due to heat shrinkage, and cause the rod position to be shifted in a state in which the heat shrink film 2 is heat shrunk. Can be reduced. For this reason, in the state which the opening part latching bag 20X heat-shrinks, there exists the characteristic which can coat | cover the battery surface stably with the heat-shrink film 2. FIG. However, the shape of the through hole is not limited to a circular shape, and may be an elliptical shape, an oval shape, a polygonal shape, or the like.

  As shown in FIGS. 3 to 5, the opening portion locking bag 20 </ b> X is heated in a state where the battery 1 is inserted and the rod 3 is inserted into the through hole 24 of the projecting portion 23. It is heat shrunk. In the opening portion locking bag 20 </ b> X, the battery 1 is inserted in a posture in which the sealing plate 12 of the battery 1 is disposed in the opening portion 22. The opening locking bag 20X covers the battery surface in a state where the sealing plate 12 of the battery 1 is exposed, and the heat shrinkable film 2 covers the opening 15 and the output terminal 13 of the safety valve disposed on the sealing plate 12. It can be exposed to the outside without coating. Furthermore, the opening portion locking bag 20X shown in the figure is held in a posture to hang from the rod 3, and the heat shrink film 2 is heated in this state. The method of suspending and heating the opening latching bag 20X in which the battery 1 is inserted from the rod 3 can hold the opening latching bag 20X in the air and heat it in a non-contact state. Can be heat-shrinked in a well-balanced manner to adhere to the battery surface. Further, as shown by an arrow A in FIG. 4, the heat shrinkable film 2 is wrinkled because the outer peripheral surface of the opening latching bag 20X can be thermally contracted while being held in a posture of being pulled downward by its own weight W of the battery 1. It has the feature that it can heat shrink while preventing

  3 to 5 is held in a state of being suspended by two rods 3 inserted through the protruding portions 23 provided on both sides. At this time, considering that the opening locking bag 20X is thermally contracted by heating, a gap 9 is provided between the upper surface of the battery 1 and the lower surface of the rod 3 as shown in the enlarged view of FIG. Can be suspended. Then, the opening part latching bag 20X hung on the rod 3 is heated to shrink the heat shrink film 2. The facing surface 20a of the opening locking bag 20X to be heated shrinks so as to be in close contact with the outer can 11 of the battery 1 as shown by an arrow A in FIG. Moreover, the opposing surface 20a of the opening part latching bag 20X also shrink | contracts also in the direction shown by the arrow B of FIG. At this time, if the amount by which the facing surface 20a contracts in the direction of arrow B is too large, the upper end portion of the battery 1 is exposed more than necessary from the opening edge 26 of the opening portion locking bag 20X. The opening portion locking bag 20 </ b> X controls the contraction amount of the facing surface 20 a with the rod 3 inserted through the protruding portion 23. When the opening locking bag 20X is heated, the facing surface 20a contracts in the direction indicated by the arrow B in FIG. 12, but the rod 3 is fixed, so the rod 3 moves in the direction indicated by the arrow C. The opening locking bag 20X moves the battery 1 in the direction indicated by the arrow F by this reaction. As shown in FIG. 13, the battery 1 moving in the direction of the arrow Y stops at a position where its upper surface contacts the lower surface of the rod 3. Therefore, the opening latching bag 20X is thermally contracted until the upper surface of the battery 1 comes into contact with the lower surface of the rod 3, and in this state, the contracted state of the opposing surface 20a is specified and the position of the opening edge 26 is specified. Is done. Thus, the opening locking bag 20X is restrained in the position of the opening 22 by the rod 3 inserted through the protruding portion 23, and the heat shrinkable film is brought into contact with the upper surface of the battery 1 against the rod 3. 2 is controlled to reliably cover a predetermined range of the surface of the battery 1. However, the opening latch bag does not necessarily need to be heat-shrinked until the upper surface of the battery contacts the lower surface of the rod, and the opening latch bag faces the opening latch bag before the upper surface of the battery contacts the lower surface of the rod. The surface can be in a state of covering a predetermined range of the battery surface.

  In order to specify the position where the facing surface 20a of the heat-shrinkable opening locking bag 20X covers the battery surface, the opening locking bag 20X shown in FIG. 12 is inserted through the through hole 24 at the position of the opening edge 26. The rod 3 is positioned between the lower surface of the rod 3 and the upper surface of the battery 1. In this opening portion locking bag 20X, in addition to the opposing surface 20a contracting in the direction indicated by arrow B, the projecting portion 23 contracts in the direction indicated by arrow C, and the opening edge 26 is substantially the same as the upper surface of the battery 1. Heat shrinks until the same position is reached. However, the position of the opening edge of the opening locking bag can be made substantially equal to the position of the lower surface of the rod. The position of the opening edge 26 of the opening portion locking bag 20X is the ratio of the heat shrinkage of the heat shrink film 2, the range in which the battery surface is covered with the heat shrink film 2, and the distance between the upper surface of the battery 1 and the lower surface of the rod 3. The optimal position is determined in consideration of (S).

  Further, the opening locking bag 20X formed by inserting the rod 3 into the protrusion 23 preferably supplies hot air from the bottom toward the opening 22 as shown in FIG. Heat shrink from the bottom side. In this heating method, the opening latching bag 20X in which the battery 1 is inserted is heat-shrinked from the bottom toward the opening 22, so that bubbles are formed between the heat-shrinkable film 2 and the battery surface, and wrinkles are formed. Can be effectively prevented. However, the whole opening part latching bag can also be heated simultaneously.

  The opening locking bag 20X described above is heated while being held in a posture of being hung from the rod 3. However, it is not always necessary to hold and heat the opening latch bag in a posture suspended from the rod, as shown in FIG. 14, it can be held and heated in a horizontal posture, or although not shown, It can also be heated while being held in a posture inclined from the horizontal direction. In the opening portion locking bag 20X shown in FIG. 14, two rods 3 projecting vertically from a support plate 31 arranged horizontally are inserted into the through holes 24, and the opening portions are engaged by these rods 3. The restraint position of the opening 22 of the bag 20X is specified. The opening latching bag 20X heated in this posture also preferably supplies hot air from the bottom toward the opening 22 to heat-shrink the heat-shrinkable film 2 from the bottom.

[Rod 3]
The rod 3 has an elongated rod shape and has an outer shape that can be inserted into the through hole 24 opened in the protruding portion 23. The rod 3 shown in the figure is a metal round bar having a circular cross-sectional shape. However, the rod 3 may be a bar having a polygonal shape, an elliptical shape, or an oval cross-sectional shape. Furthermore, the rod 3 can also be a cylinder having a hollow inside. The rod 3 has heat resistance that prevents the rod 3 itself from being deformed by heat generated when the heat-shrinkable film 2 is thermally contracted.

  Furthermore, since the rod 3 shown in FIGS. 3 to 5 supports the opening locking bag 20X into which the battery 1 is inserted in a suspended state, the rod 3 has a strength that does not deform due to the weight of the battery 1. In particular, as shown in FIG. 15, the rod 3 that suspends the plurality of opening latching bags 20X in which the batteries 1 are inserted in parallel is not deformed by the weight of the plurality of opening latching bags 20X that are suspended. Has strength. The rod 3 in FIG. 15 is inserted into the through holes 24 of the plurality of opening portion locking bags 20X arranged in parallel, and is held in a state where the plurality of opening portion locking bags 20X are suspended from the same rod 3. Yes. Thus, the method of suspending and heating a plurality of opening locking bags 20X from the same rod 3 can efficiently coat the heat shrink film 2 on the surfaces of a large number of batteries 1.

  Further, a member having low thermal conductivity, for example, a heat-resistant plastic rod 3 can be used for the rod. This rod can effectively prevent the rod itself from being heated to a high temperature by this heat even in a state where the opening locking bag is heated and contracted, so that the rod can be effectively heated to a high temperature. Therefore, it is possible to effectively prevent the through hole of the protruding portion through which the rod is inserted from being deformed by heat.

[Heating furnace 4]
As described above, the opening locking bag 20X in which the battery 1 is inserted and the rod 3 is inserted into the through hole 24 of the protruding portion 23 is heated to heat-shrink the heat-shrinkable film 2. The opening latching bag 20X, for example, heats the heat-shrinkable film 2 by putting it in the heating furnace 4 and heating it. The heating furnace 4 shown in FIGS. 16 and 17 has a container shape with an upper opening, and has a depth and a width into which the opening locking bag 20X in which the battery 1 is stored can be inserted. In the heating furnace 4 shown in the figure, side walls 42 are connected to both sides of a bottom plate 41 to form a container shape as a whole. The heating furnace 4 has a supply hole 43 for supplying hot air to the lower end portion of the side wall 42 so that hot air can be supplied into the heating furnace 4 from below. As shown in FIG. 16, the heating furnace 4 can insert the opening locking bag 20X from the upper opening 20 and heat the opening locking bag 20X from the bottom. In particular, the opening locking bag 20X that is held in a state of being suspended from the rod 3 is inserted into the heating furnace 4 from above, so that the heat shrinks from the bottom of the opening locking bag 20X toward the opening 22. In addition, it is possible to effectively prevent air bubbles and wrinkles between the heat shrink film 2 and the battery surface. This method has a feature that the shrinkage state of the heat shrinkable film 2 can be controlled by the speed at which the opening portion locking bag 20X is inserted into the heating furnace 4.

  Furthermore, as shown in FIG. 15, even in the method in which the plurality of opening portion locking bags 20X are arranged in parallel and are suspended from the rod 3, the plurality of opening portion locking bags 20X are suspended from the rod 3 in the posture. It can insert into the heating furnace 4 from the opening part 40, and can heat-shrink by heating from a bottom part simultaneously. In particular, this method is characterized in that the plurality of opening locking bags 20X can be heated under the same conditions, so that the heat shrinkable film 2 can be uniformly heat shrunk and the covering state of the battery surface can be made uniform.

  However, the opening latching bag 20X does not necessarily have to be heated in the heating furnace 4, and can be heated by blowing hot air from the surface with a blower such as a dryer. In this case as well, hot air can be supplied from the bottom toward the opening 22 so that the heat shrinkable film 2 can be heat shrunk from the bottom side.

  As shown in FIG. 6, the battery covered with the heat-shrinkable film 2 as described above can be improved in appearance by removing the protruding portion 23 protruding from the upper surface of the battery 1. The protruding portion 23 protruding from the upper surface of the battery 1 can be removed from the heat shrink bag 20 after the rod 3 is pulled out, or can be removed while the rod 3 is inserted. The protruding portion 23 removed from the heat shrink bag 20 can be removed by cutting, for example, or can be removed by fusing. However, the protruding portion protruding from the battery is not necessarily removed.

DESCRIPTION OF SYMBOLS 1 ... Battery 2 ... Heat-shrink film 3 ... Rod 4 ... Heating furnace 9 ... Crevice 10 ... Square battery 11 ... Exterior can 12 ... Sealing plate 13 ... Output terminal 14 ... Insulation member 15 ... Opening part 20 ... Heat-shrinkable bag 20X ... Opening Partial locking bag
20a ... both sides
20b ... Machi 21 ... Storage part 22 ... Opening part 23 ... Projection part 23A ... Locking part
23B ... Machi club
23C ... Locking piece 24 ... Through hole 25 ... Notch recess 26 ... Opening edge 29 ... Folding curve 31 ... Support plate 40 ... Opening 41 ... Bottom plate 42 ... Side wall 43 ... Supply hole

Claims (10)

The battery (1) is inserted into the heat-shrinkable bag (20) that has a heat-shrinkable film (2) that shrinks when heated, and the heat-shrinkable bag (20) is heated to shrink the battery (1). A method for producing a battery comprising a heat-shrinkable film covering a surface closely adhering to the surface of the battery,
The heat shrink bag (20) for inserting the battery (1) has a protrusion (23) protruding from the battery (1) to be inserted in the opening (22), and the protrusion (23) has a through hole. Using the opening locking bag (20X) with (24), with the battery (1) inserted into this opening locking bag (20X) and the rod (3) inserted into the through hole (24) A manufacturing method of a battery, wherein the surface of the opening latching bag (20X) is heated and shrunk to cover the surface with a heat shrinkable film.   The method for producing a battery in which the surface (1) is a prismatic battery (10) and the surface is covered with a heat shrink film.   The manufacturing method of the battery which coat | covers the surface as described in Claim 2 with which the said opening part latching bag (20X) has provided the protrusion part (23) in the both sides of the opening part (22). .   The sealing plate (12) of the battery (1) is disposed in the opening (22) of the opening locking bag (20X), and the battery (1) is inserted into the opening locking bag (20X). A method for producing a battery, wherein the surface described in any one of 1 to 3 is coated with a heat shrink film.   The method for producing a battery having a surface covered with a heat-shrinkable film according to any one of claims 1 to 4, wherein the through-hole (24) of the opening portion locking bag (20X) is circular.   The surface according to any one of claims 1 to 5, wherein the opening locking bag (20X) into which the battery (1) is inserted is heated from the bottom toward the opening (22) to be thermally contracted. Of manufacturing a battery covered with a heat shrink film.   The opening latch bag (20X) formed by inserting the battery (1) is heated and shrunk by being suspended by the rod (3). A method for producing a battery having a surface covered with a heat shrink film.   The opening locking bag (20X) suspended from the rod (3) is put into a heating furnace (4) from the bottom, and the opening locking bag (20X) is thermally contracted from the bottom. A battery manufacturing method in which a surface to be coated is covered with a heat shrink film.   A plurality of opening locking bags (20X) formed by inserting the battery (1) are arranged in parallel, and a rod (3) is inserted into the through hole (24) of each opening locking bag (20X). A method for producing a battery in which the heat-shrinkable film (2) is heated to heat-shrink and the surface is covered with the heat-shrinkable film.   The surface according to any one of claims 1 to 9, wherein the protrusion (23) from the battery (1) is removed after the opening latching bag (20X) is heated and thermally contracted. A method for producing a battery covered with a film.

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