JP4456801B2 - Method for forming insulation coating of polymer battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulating coating formed how to apply the insulating coating of the laminate sheet and the outer material polymer battery and its exterior material.
[0002]
[Prior art]
Batteries generally use a liquid electrolyte, so the battery can consists of a plate group and an electrolyte so that the electrolyte does not leak outside or moisture does not flow from the outside. The power generation element is accommodated, and the opening of the battery can is sealed with a sealing plate using a sealing member such as a gasket. When a metal can is used as an exterior material, there is a limit to downsizing, thinning, and weight reduction, and as a battery power source for portable electronic devices that require reduction in size and weight, lithium polymer electrolyte secondary batteries that do not use a metal can Such polymer batteries have been developed. The polymer battery can use a gel electrolyte, so there is little risk of liquid leakage, and an aluminum laminate sheet with both sides of an aluminum foil covered with a resin film can be used as an exterior material instead of a battery can. It is effective for achieving reduction in weight and weight.
[0003]
As shown in FIG. 4, a polymer battery using an aluminum laminate sheet as an exterior material seals a power generation element in an exterior body 14 in which the periphery of a pair of aluminum laminate sheets 15 and 15 cut into a predetermined shape is thermally welded. Configured. The power generation element is composed of an electrode plate group 13 in which a positive electrode plate 10 and a negative electrode plate 12 are laminated via a separator 11, and a gel electrolyte, and the positive electrode lead 8 and the negative electrode plate 12 drawn from the positive electrode plate 10. The negative electrode lead 9 drawn out from is pulled out to the outside from the time when the pair of aluminum laminate sheets 15 and 15 are thermally welded.
[0004]
The aluminum laminate sheet 15 is obtained by laminating resin films 16a and 16b on both surfaces of an aluminum foil 17 serving as a base material, as shown in an enlarged view of an end portion thermally welded in FIG. In order to form, a pair of laminate sheets 15 and 15 are heat-welded around. The heat welding is performed by heating and melting the resin films 16b and 16b on the inner surface side of the pair of aluminum laminate sheets 15 and 15 and joining them.
[0005]
In the polymer battery 1 configured as described above, since the cut portion of the aluminum laminate sheet 15 exists on the edge of the outer package 14, the cut surface of the aluminum foil 17 is exposed to the outside as shown in FIG. There is a problem that a conductor contacts the aluminum foil 17 to cause a short circuit. In order to avoid contact with the exposed end of the aluminum foil 17, conventionally, as shown in FIG. 5, the end of the outer package 14 that may be in contact with the conductor is covered with an insulating tape 18. Yes.
[0006]
The insulating tape 18 is attached to the predetermined end side of the polymer battery 1 by a tape attaching apparatus as shown in FIG. The polymer battery 1 is fixed by a grip 56 to a battery fixing portion 51 mounted on the guide rail 58 disposed on the device base 55 so as to be movable in the K direction in the drawing, and the battery fixing portion 51 is manually moved in the K direction. When the apparatus is operated after being fixed at the tape attaching position, the insulating tape 18 is attached to the polymer battery 1 by the operation control by the control unit 60.
[0007]
The insulating tape 18 is drawn out from the tape cartridge 50, the tip thereof is gripped by an open / close chuck provided in the tape drawing head 54, and pulled out to a predetermined length by moving the tape drawing head 54 in the M direction in the figure. The controller 60 controls the drawing operation of the insulating tape 18 by the tape drawing head 54 and the rotation operation of the tape cartridge 50 in the direction I in the figure. When the drawing operation of the insulating tape 18 by the tape drawing head 54 is performed, the control unit Reference numeral 60 controls the drive of the actuator 59. Since the actuator 59 drives the tape adhering head 53 mounted on the guide rail 58 to advance in the L direction in the drawing, the insulating tape 18 is cut by the tape cutting blade 52 provided on the tape drawing head 54, and the tape adhering head. The insulating tape 18 drawn out by 54 is pressed against the edge of the polymer battery 1 fixed to the battery fixing part 51 with a predetermined pressure and is folded in two and stuck.
[0008]
[Problems to be solved by the invention]
However, in the sticking device of the insulating tape 18 to the polymer battery 1 according to the above-described prior art, the insulating tape 18 can be stuck only to a relatively linear part, and there are obstacles to corner parts and sticking. There was a problem that the part had to be relied on manually. For example, the insulating tape 18 cannot be attached to the end from which the positive electrode lead 8 and the negative electrode lead 9 shown in FIG. 5 are drawn out, and the positive electrode lead 8 and the negative electrode lead can be manually attached. Insulating tape 18 is dispersed and stuck around 9.
[0009]
Therefore, the structure and method and apparatus for attaching the insulating tape 18 to insulate the edges of the polymer battery 1 have poor workability, and there is a problem that man-hour increase and cost increase cannot be avoided.
[0010]
The purpose of the present invention is to sandwich the positive electrode lead and the negative electrode lead between two rectangular laminate sheets coated with a resin film on both sides of the metal foil so that the tips of the positive and negative leads protrude between the two laminate sheets, The surface perpendicular to the laminated surface of the two laminated sheets laminated is sealed, and an ultraviolet curable resin is applied to all surfaces perpendicular to the laminated surface of the laminated sheet , and the ultraviolet curing applied is applied. solidifying the resin to provide an insulating coating forming how the polymer battery to form an insulating coating.
[0011]
[Means for Solving the Problems]
To achieve the above object, an insulating coating forming method of this onset Ming polymer battery, both surfaces of the positive electrode lead and the negative electrode lead between the laminate sheet two rectangular coated with the resin film leading end of the two metal foils The laminate sheet is sandwiched so as to protrude from between the two laminated sheets, and a surface perpendicular to the laminated surface of the two laminated sheets is sealed, and UV curing is performed on all surfaces perpendicular to the laminated surface of the laminated sheets. A resin is applied , and the applied ultraviolet curable resin is solidified to form an insulating coating.
[0012]
According to the above configuration, the two ends of the metal foil are sandwiched between two rectangular laminate sheets covered with a resin film so that the leading ends of the positive electrode lead and the negative electrode lead protrude from between the two laminate sheets, and overlapped. Even if the cut edge of the metal foil is exposed on the surface perpendicular to the laminate surface of the laminate sheet by sealing the surface perpendicular to the laminate surface of the two laminate sheets, the surface perpendicular to the laminate surface of the laminate sheet Since the insulation coating is applied to all , the occurrence of a short circuit or the like due to the contact of the conductor with the metal foil is prevented. Insulating coating is formed by solidifying by coating wearing ultraviolet curing resin, since no heat is applied to the formation of the insulating coating, it is possible to form the insulating coating without thermally affecting the resin film layer of the laminate sheet .
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
[0022]
FIG. 1 shows a configuration of a polymer battery 100 according to the embodiment, and an insulating coating 2 is formed on a predetermined end side of the polymer battery 1 shown in FIG. The insulating coating 2 is obtained by applying an ultraviolet curable resin to a predetermined end side and then curing the ultraviolet curable resin applied by ultraviolet irradiation to coat the predetermined end side with the resin.
[0023]
As described above, in the state of the polymer battery 1 in which the insulating coating 2 is not formed, the end sides of the exterior body 14 formed by thermally welding the periphery of the pair of aluminum laminate sheets 15 and 15 are shown in FIG. ), Since the cut surface of the aluminum foil 17 that is the core material of the aluminum laminate sheet 15 is exposed to the outside, a short circuit or the like may occur due to contact of the conductor with the aluminum foil 17. However, in the polymer battery 100 according to the present embodiment, the cut end of the aluminum foil 17 is covered with the insulating coating 2 as shown in FIG. Generation | occurrence | production of the short circuit by contact, etc. is prevented.
[0024]
In the present embodiment, the insulating coating 2 has an end on which contact with a conductor is likely to occur, that is, an end (B) from which the positive lead 8 and the negative lead 9 are drawn and an opposite end (A). However, the insulating coating 2 can be formed on all four sides. Further, according to the method for forming the insulating coating 2 according to the present embodiment, since the insulating coating 2 is also formed at the four corner portions of the exterior body 14, the insulation of the corner portion that is most likely to come into contact with the conductor is enhanced. It is done.
[0025]
As shown in FIG. 2 (a), an insulating coating forming method in which an insulating coating 2 is formed on an arbitrary edge of the polymer battery 1 to form a polymer battery 100 includes a polymer battery 1 in a molten resin reservoir 3 in which an ultraviolet curable resin is stored. One end side (A) is immersed to attach an ultraviolet curable resin to the end side (A), the polymer battery 1 is inverted, and the other end (B) is immersed in the molten resin reservoir 3 to end the end side. (B) is coated with an ultraviolet curable resin. Since the positive electrode lead 8 and the negative electrode lead 9 protrude from the end side (B), when the molten resin is applied to the end side (B), the positive electrode lead 8 is inserted into the lead relief hole 3 a provided in the molten resin reservoir 3. Then, the negative electrode lead 9 is accommodated and an ultraviolet curable resin is applied to the end side (B). When the insulating coating 2 is formed on the other sides other than the end sides (A) and (B), the end side where the insulating coating 2 is to be formed is directed to the molten resin reservoir 3 side, and the ultraviolet curable resin is applied in the same manner. be able to.
[0026]
As shown in FIG. 2 (b), the polymer battery 1 in which the ends A and B are coated with an ultraviolet curable resin is rotated in an environment irradiated with ultraviolet rays from the ultraviolet light source 4 to cure the ultraviolet curable resin. An insulating coating 2 is formed on the end sides (A) and (B). As shown in FIG. 1B, the thickness a of the insulating resin 2 formed on the end side is determined by the viscosity of the ultraviolet curable resin and the environmental temperature, but is 20 to 40 μm here. The formation height b can be arbitrarily selected depending on the amount of advance of the molten resin reservoir 3, but is set to 2 to 3 mm here.
[0027]
An insulating coating forming apparatus for realizing the insulating coating forming method will be described below with reference to FIG.
[0028]
In FIG. 3A, a base 36 that is rotationally driven by a rotational driving means 42 is disposed above the gantry 37, and the battery rotating means 32 is fixed on the base 36. The battery rotating means 32 holds the polymer battery 1 by vacuum suction with a holding plate (battery holding means) 33, and rotates the holding plate 33 to rotate and move an arbitrary end of the polymer battery 1 in a predetermined direction. The battery rotating means 32 holding the polymer battery 1 is controlled to move from the coating position indicated by the solid line to the solidified position indicated by the broken line at a predetermined timing by the base 36 being rotated by the rotation driving means 42. Is done.
[0029]
Further, a base 39 provided with a lift drive means 40 is mounted on a guide rail 38 disposed in the X-axis direction in the figure below the gantry 37, and the guide rail 38 is moved in the X-axis direction by an advancing / retreating drive means 41. Move forward and backward. A container 29 constituting a coating portion (resin coating means) 21 is fixed to the lift shaft of the lift drive means 40, and the container 29 is moved up and down in the Y-axis direction by the lift drive means 40.
[0030]
As shown in the state viewed from the X-axis direction in FIG. 3B, the coating unit 21 contains a porous and elastic impregnated body 30 in a container 29, and a dispenser (molten resin) is contained in the container 29. A predetermined amount (for example, 5 cc) of ultraviolet curable resin is periodically discharged from the supply means) 26 through the supply pipe 27. The ultraviolet curable resin supplied into the container 29 is always in a state where a certain amount of the impregnated body 30 is impregnated. The impregnated body 30 is formed with two notches 31, 31 having a width of approximately ½ in the X-axis direction. The positions of the notches 31 are the formation of the positive electrode lead 8 and the negative electrode lead 9 provided in the polymer battery 1. Corresponds to the position. The dispenser 26 communicates with the tank 25 through a pipe 38, and a predetermined pressure (for example, 0.3 MPa) is applied to the tank 25 to which a certain amount of ultraviolet curable resin is supplied from the outside through the supply pipe 28. Thus, the dispenser 26 can feed a certain amount of ultraviolet curable resin into the container 29 by opening and closing the electromagnetic valve provided therein.
[0031]
The operation of the battery rotation means 32, the rotation drive means 42, the elevation drive means 40, the advance / retreat drive means 41 and the dispenser 26 in the above configuration is controlled by the control unit 24. The procedure of operation control by the control unit 24 will be described below.
[0032]
When the polymer battery 1 is carried into the apparatus by a transfer device (not shown) and the polymer battery 1 is brought into contact with the holding plate 33, the holding plate 33 sucks and holds the polymer battery 1 on its flat surface by vacuum suction. The adsorption posture of the polymer battery 1 at this time is such that the end (B) where the positive electrode lead 8 and the negative electrode lead 9 are formed is upward. That is, the procedure is to apply the ultraviolet curable resin from the end (A) side. Since the ultraviolet curable resin is applied from the end (A) side, the advancing / retreating drive means 41 drives the base 39 to advance / retreat on the guide rail 38, and the impregnated body (molten resin pool) 30 in the container 29 on the base 39. The portion where the notch 31 is not formed is moved forward and backward so that it is located immediately below the polymer battery 1 held by the holding plate 33.
[0033]
Next, when the container 29 is raised to a predetermined height position by the elevation drive means 40, the impregnated body 30 comes into contact with the end side (A) of the polymer battery 1, and the end side (A) has elasticity inside the impregnated body 30. Therefore, the impregnated ultraviolet curable resin is applied to the edge (A). The coating height b (see FIG. 1B) at which the ultraviolet curable resin is applied to the edge (A) can be set by the rising height position of the container 29. In addition, the pressing force against the edge (A) is selected so that the rising speed and the hardness of the impregnated body 30 are not deformed, and the upper limit is 0.08 MPa.
[0034]
After the ultraviolet curable resin is applied to the end (A), the raising / lowering driving means 40 is driven in the downward direction to lower the container 29, and the battery rotating means 32 rotates the holding plate 33 to rotate the polymer battery 1. Is rotated so that its end (B) faces downward. Since the positive electrode lead 8 and the negative electrode lead 9 are formed on the end side (B), the advance / retreat driving means 41 moves the base 39 forward and backward on the guide rail 38, and the impregnated body 30 in the container 29 on the base 39. The part where the notch 31 is located is positioned below the polymer battery 1. After the positioning is completed, when the container 29 is raised to a predetermined height position by the elevation driving means 40, the positive electrode lead 8 and the negative electrode lead 9 formed on the end side (B) are accommodated in the notch 31 and the end side (B ) Advances to the impregnated body 30 to a predetermined depth, and an ultraviolet curable resin is applied to the edge (B) except for the positive electrode lead 8 and the negative electrode lead 9.
[0035]
After the container 29 is lifted and the UV curable resin is applied to the end (B), the lift drive means 40 lowers the container 29 by the lowering operation, so the rotation drive means 42 rotates the base 36 by 180 degrees. The holding plate 33 holding the polymer battery 1 is moved from the coating position indicated by the solid line to the solidification position indicated by the broken line.
[0036]
An ultraviolet irradiation unit (resin solidification unit) 23 is provided at the solidification position, and ultraviolet rays emitted from a light source (ultraviolet irradiation unit) 43 whose output can be adjusted are condensed by the reflector 43 and irradiated to the polymer battery 1. . Reference numeral 45 denotes an ultraviolet shielding plate that shields ultraviolet rays from being irradiated unnecessarily. The battery rotating means 32 rotates the holding plate 33 to cure the ultraviolet curable resin applied so that the ultraviolet rays are evenly applied to the edges (A) and (B) of the polymer battery 1, and the edges (A ) Insulation coating 2 is formed on (B). When the peak intensity of the light source 43 is adjusted and the amount of energy to be exposed is approximately 800 mj, when the polymer battery 1 is rotated at approximately 15 rpm by the battery rotating means 32, the ultraviolet curing applied by the exposure for about 4 seconds. The resin is cured and formed on the insulating coating 2. The power supply control of the light source 43 is set manually, but can be configured to be controlled by the control unit 24 as necessary.
[0037]
After the insulating coating 2 is formed on the polymer battery 1, the rotation driving means 42 rotates the base 36 by 180 degrees to return the holding plate 33 holding the polymer battery 1 to the coating position. The vacuum adsorption is released, and the polymer battery 1 is transferred to a transfer device (not shown) and carried out of the device as a polymer battery 100 having a resin coating 2 formed thereon.
[0038]
Since the process of forming the insulation coating 2 for one polymer battery 1 is completed by the above procedure, the insulation coating 2 is formed by carrying in the process procedure by carrying in the polymer battery 1 to be processed next by the transfer device. The polymer battery 100 can be automatically produced. During carry-out and carry-in of switching the polymer battery 1 to be processed, the electromagnetic valve of the dispenser 26 is operated to feed the ultraviolet curable resin into the container 29, and the operation for the next coating is performed.
[0039]
In the configuration of the polymer battery 100 described above, the insulating coating 2 is formed on the edges (A) and (B) of the exterior body 14, but in the insulating coating forming apparatus shown in FIG. If the rotation of the battery 1 is controlled to be rotated every 90 degrees, and the operations of the advance / retreat drive means 41 and the elevating drive means 40 are controlled each time, the insulating coating 2 can be formed on all four sides of the polymer battery 1. Further, the coating thickness a of the insulating coating 2 can be arbitrarily set by adjusting the viscosity of the ultraviolet curable resin, and the insulating coating can be adjusted by adjusting the rising height position of the container 29 by the lifting drive means 40. The coating height b can be changed to 2.
[0040]
【The invention's effect】
As the insulating coating forming method of a polymer battery according to the present invention the above description, the both sides of the metal foil lamination plane perpendicular the plane of the rectangular laminate sheet coated with a resin film, a metal foil is exposed external can have, is prevented Runode to cover the exposed portion of the metal foil by applying an insulating coating on all the lamination plane perpendicular the plane of the laminate sheet, occurrence of short circuit caused by a conductor comes into contact with the metal foil, a thin, compact Thus, a battery suitable for application to a portable electronic device or the like in which the components are densely arranged can be obtained. Further, since the insulating coating is obtained by applying an ultraviolet curable resin to all surfaces perpendicular to the laminate sheet lamination surface and solidifying by ultraviolet irradiation, the insulating coating is not adversely affected. Further, the formation of the insulating coating can be automated, and a polymer battery can be efficiently manufactured without adding manpower.
[Brief description of the drawings]
FIG. 1A is a plan view showing a configuration of a polymer battery according to an embodiment, and FIG.
FIG. 2 is an explanatory view showing a method for forming an insulating coating of the polymer battery.
FIGS. 3A and 3B are diagrams showing the configuration of an insulation coating forming apparatus, and FIG. 3B is a configuration diagram of a coating unit.
4A is a plan view showing a configuration of a polymer battery, FIG. 4B is a cross-sectional view, and FIG. 4C is an enlarged cross-sectional view of an end side;
5A is a plan view showing the configuration of a polymer battery according to the prior art, and FIG. 5B is an enlarged cross-sectional view of an end side.
FIG. 6 is a configuration diagram showing a configuration of an insulating tape attaching apparatus according to a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,100 Polymer battery 2 Insulation coating 14 Exterior body 15 Aluminum laminate sheet 16a, 16b Resin film 17 Aluminum foil 21 Coating part (resin coating means)
23 UV irradiation part (resin solidification means)
26 Dispenser (resin supply means)
30 Impregnated body (molten resin pool)
32 battery rotating means 33 holding plate (battery holding means)
40 Lifting / lowering drive means 41 Advance / retreat drive means 42 Rotation drive means 43 Light source (ultraviolet irradiation means)

Claims (1)

The metal foil is sandwiched between two rectangular laminate sheets coated with a resin film so that the tip of the positive electrode lead and the negative electrode lead protrudes between the two laminate sheets,
Sealing the surface perpendicular to the laminated surface of the two laminated sheets superimposed,
Apply UV curable resin to all surfaces perpendicular to the laminated surface of the sealed laminate sheet ,
A method of forming an insulating coating for a polymer battery, comprising solidifying the applied ultraviolet curable resin to form an insulating coating.

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