JP2003272598A - Nonaqueous electrolyte battery and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte battery capable of detecting an insulation protective tape while the insulation protective tape protecting a current collecting lead of an electrode plate is formed as thin as possible, and to provide a method for appropriately manufacturing the nonaqueous electrolyte battery. <P>SOLUTION: Current collecting leads 13, 12 are connected to a positive plate 19 and a negative plate 20 of the spiral electrode group 2, and at least one portion in the connecting part of a positive current collecting lead 13 and/or a negative current collecting lead 12 to the electrode plates 19, 20 and in the vicinity part of the connection part is covered with insulating protection tapes 31, 33 with fluorescent paint. In a manufacturing process, the presence or no presence or the position slippage of the positive plate 19 and/or the negative plate 20 is distinguished based on the detection of the fluorescent paint in the insulating protection tapes 31, 33 with a fluorescence sensitive sensor 34. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-aqueous electrolyte (organic solvent electrolyte) battery represented by a lithium-ion secondary battery, which is a sealed battery having a small capacity and a large capacity, and a method for producing the same. It is about.

[0002]

2. Description of the Related Art In recent years, portable and cordless AV equipment or electric equipment such as personal computers and portable communication equipment have been rapidly promoted. Conventionally, aqueous solution batteries such as nickel-cadmium batteries and nickel-hydrogen batteries have been mainly used as driving power sources for these electric devices, but in recent years, particularly, rapid charging is possible and the energy density is high and high. Non-aqueous electrolyte secondary batteries typified by lithium-ion secondary batteries having safety are becoming mainstream. In this non-aqueous electrolyte secondary battery, it has been promoted that it is a sealed type that is excellent in high energy density and load characteristics, and that it is a prism that is suitable for thinning equipment and has high space utilization efficiency.

Further, in recent years, there has been a great demand for further improvement in the battery capacity per unit volume of non-aqueous electrolyte secondary batteries. Therefore, conventionally, a core material (generally, the positive electrode plate is made of aluminum and the negative electrode plate is made of aluminum) 51 of the positive and negative electrode plates 50 shown in FIG. It is made as thin as possible and covers the positive and negative current collecting leads 52 attached to the exposed part of the core material 51 by welding, thereby electrically insulating the adjacent opposite electrodes and protecting the leads 52. It is also considered to reduce the thickness of the tape 53.

The insulating protective tape 53 covers the burrs generated when the current collecting leads 52 are processed and the burrs generated when the current collecting leads 52 are welded to the core material 51, so that the burrs can break through the separator. The internal short circuit due to the current collecting lead 52 coming into contact with the opposite electrode plate is prevented, and the internal short circuit caused by an external shock or over-discharge is prevented. It also plays a role of reinforcing the mechanical strength of 52.

Currently, the protective tape 53 is 50 μm
Those having a thickness of 10 mm are generally used. Also,
As shown in FIG. 6A, which is a cross-sectional view taken along the line AA of FIG. 6A, the insulating protection tape 53 covers the current collecting leads 52, and additionally, the current collecting leads 52 in the core material 51. It is also affixed to the opposite side of the joint surface. This is because burrs are generated on both sides of the current collecting lead 52, so that the burrs that protrude inward of the current collecting lead 52 and break through the core material 51 are covered.

[0006]

By the way, in the manufacturing process of the non-aqueous electrolyte secondary battery, whether or not the insulating protection tape 53 is attached at a predetermined position of the electrode plate 50 is determined by the reflection type photoelectric sensor in a non-contact manner. Is detected. Therefore, the insulating protection tape 53 is colored for the purpose of being accurately detected by the photoelectric sensor. However, for the purpose of improving the battery capacity per unit volume, the insulating protection tape 53 is, for example, a half of the current thickness of 50 μm.
When the thickness is reduced to about 5 μm, the insulating protective tape 53 becomes transparent, which causes a problem that it cannot be detected by the photoelectric sensor. Also, the protective tape 53
There is also a drawback that the color pigment for coloring the battery adversely affects the battery.

Therefore, the present invention has been made in view of the above-described conventional problems, and it is possible to reliably detect with a sensor while making the insulating protection tape for protecting the current collecting leads of the electrode plate as thin as possible. It is an object of the present invention to provide a non-aqueous electrolyte battery that can be manufactured and a method that can suitably manufacture the non-aqueous electrolyte battery.

[0008]

In order to achieve the above object, the non-aqueous electrolyte battery of the present invention has a bottomed cylindrical battery case in which a spiral electrode group is housed and an organic electrolyte is injected. In this configuration, the opening of the battery case is sealed with a sealing plate, and a current collecting lead is attached to each of the positive electrode plate and the negative electrode plate of the spiral electrode group, and the positive electrode current collector is attached. It is characterized in that at least a part of a joining portion of the current lead and / or the negative electrode current collecting lead to the electrode plate and a portion in the vicinity thereof are covered with an insulating protective tape having a fluorescent paint.

In this non-aqueous electrolyte battery, the insulating protective tape covering the current-collecting leads has fluorescent paint. Therefore, in the inspection for the presence or absence of the insulating protective tape, which is carried out after the production of the electrode plate, the fluorescent paint is used. The presence or absence of the insulating protection tape can be determined by detecting the. Therefore,
Unlike conventional insulation protection tapes whose presence is discriminated by the detection of color, insulation protection tapes can be made as thin as possible. Since the length or the thickness of the active material layer can be set large, the volume energy density can be improved. Moreover, since the insulating protective tape only has a fluorescent paint that does not have any adverse effect when it is made into a battery, there is a problem of adverse effect on the battery due to the coloring pigment that has been applied to the conventional insulating protective tape. It can be resolved.

In the above invention, the positive electrode current collecting lead is
Insulation protective tape is attached in a wound state only on the vicinity of both sides of the positive electrode core member with one side in the longitudinal direction sandwiched therebetween, and the negative electrode current collecting lead covers the joint with the negative electrode core member. It is preferable that the insulating protection tape is attached.

According to this structure, the positive electrode current collecting lead is
A part that is a base when bent in the battery assembly process and is easily broken by stress,
In other words, mechanical strength is reinforced by covering only the adjacent parts on both sides of one side of the positive electrode core material in the longitudinal direction with the insulating protective tape. In this case, the amount of insulating protective tape used on the positive and negative electrode plates is significantly reduced compared to the conventional electrode plate because the insulating protective tape is attached only to the extent that it does not come off. The length of the electrode plate or the thickness of the active material layer can be increased by the amount corresponding to the decrease in the amount used, and the volume energy density can be significantly improved.

In the above invention, the insulating protective tape is 25
It can be set to a thickness of μm or less. In other words, in the inspection process for the presence / absence of the insulation protection tape after the completion of the production of the electrode plate, it is possible to determine the presence / absence of the insulation protection tape by detecting the fluorescent paint contained in the insulation protection tape. Even if the tape is set to a thin thickness of 25 μm or less, the insulating protection tape can be accurately detected in the inspection process.

In the method for producing a non-aqueous electrolytic pressure battery of the present invention, a positive electrode current collecting lead and a negative electrode current collecting lead are joined to a positive electrode plate and a negative electrode plate by welding, respectively, before joining to the positive and negative electrode plates. Alternatively, an insulating protection tape having a fluorescent coating is attached to a predetermined portion of the positive electrode current collecting lead and / or the negative electrode current collecting lead after joining in a covered state to insulate the positive electrode plate and / or the negative electrode plate. The presence or absence of tape or displacement is determined based on the detection of fluorescent paint on the insulating protection tape by a fluorescent sensor, and the positive and negative plates are spirally wound with a separator interposed between them. By forming a spiral electrode group, the spirally wound electrode group is housed in a bottomed cylindrical battery case, and an organic electrolyte is injected, and the opening of the battery case is sealed with a sealing plate. What to do It is characterized.

In this method of manufacturing a non-aqueous electrolyte battery, the presence or absence of displacement of the insulating protective tape of the electrode plate which has been manufactured and transferred, and the positional deviation of the insulating protective tape are detected by the fluorescent paint which the insulating protective tape itself has. It is possible to accurately determine the presence or absence of the insulating protective tape or the positional deviation even if the insulating protective tape has a very thin thickness and can be seen through because of its thinness.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a non-aqueous electrolyte battery according to an embodiment of the present invention. In the figure, a prismatic lithium secondary battery, which is one of the typical non-aqueous electrolyte batteries, is illustrated. In this non-aqueous electrolyte battery, a rectangular spiral electrode group 2 is provided in an aluminum battery case 1 having a rectangular shape with a bottom and a flat cross section.
, And the opening of the battery case 1 is sealed by the sealing plate 3.

The frame 4 for supporting the sealing plate 3 is fitted in the battery case 1 in the vicinity of the opening, and the sealing plate 3 has the frame 4.
The opening of the battery case 1 is sealed by being welded to the opening peripheral portion of the battery case 1 while being placed and supported thereon. An upper insulating gasket 8 is fitted in a recess 7 at the center of the sealing plate 3, and the negative electrode terminal 9 made of a nickel-plated iron rivet has the upper insulating gasket 8 interposed therebetween. On the other hand, it is inserted into the insertion holes of the upper insulating gasket 8 and the sealing plate 3 while being electrically insulated.

The lower portion of the negative electrode terminal 9 into which the upper insulating gasket 8 and the sealing plate 3 are inserted is further
After being inserted into the respective mounting holes of the lower insulating gasket 10 and the negative electrode terminal plate 11, the lower ends thereof are caulked. As a result, the negative electrode terminal plate 11 is electrically insulated from the sealing plate 3 via the lower insulating gasket 10 and is electrically connected to the negative electrode terminal 9 via the caulked portion of the negative electrode terminal 9.

The negative electrode current collecting lead 12 and the positive electrode current collecting lead 13 derived from the rectangular spiral electrode group 2 are inserted into the through holes 4a and 4b of the frame body 4, respectively, and the positive electrode current collecting lead 13 of the positive electrode current collecting lead 13 is inserted. The tip portion is welded to the inner surface of the sealing plate 3, and the tip portion of the negative electrode current collecting lead 12 is welded to the negative electrode terminal plate 11.

In assembling the above non-aqueous electrolyte battery, after attaching the upper insulating gasket 8, the lower insulating gasket 10 and the negative electrode terminal plate 11 by the negative electrode terminal 9, the sealing plate 3 is attached to the opening of the battery case 1. Insert into and weld. After that, an organic electrolytic solution (not shown) is injected into the battery case 1 through the liquid injection hole 3a of the sealing plate 3. The liquid injection hole 3a is closed by the sealing plug 14 after the injection of the electrolytic solution.

Further, the sealing plate 3 is formed with a safety valve hole 3b at a position opposite to the liquid injection hole 3a. The safety valve hole 3b is closed by an aluminum thin film 17 attached to the lower surface of the sealing plate 3 by a clad method.
The portion of the aluminum thin film 17 that closes the safety valve hole 3b constitutes a safety valve 17a that is broken when the internal pressure of the battery rises and releases gas to the outside. The positive electrode terminal 18 is joined to the bottom surface of the battery case 1.

FIG. 2A schematically shows the relative positional relationship of the positive and negative electrode plates 19 and 20 and the pair of separators 21A and 21B, which are the constituent elements of the rectangular spiral electrode group 2, before winding. It is a top view. The positive electrode plate 19 is a strip-shaped positive electrode core material 2
2 has a positive electrode active material layer 23 formed on both surfaces thereof, and the negative electrode plate 20 has a strip-shaped negative electrode core material 24 having negative electrode active material layers 27 formed on both surfaces thereof. The bipolar plates 19 and 20 are stacked in a state where the positive electrode plate 19 is located on the inner side in the winding direction indicated by the arrow with the separators 21A and 21B interposed therebetween,
A pair of winding cores 28A and 28B are provided on both separators 21A and 21B.
Each starting end portion of B is sandwiched from both sides and rotated in the winding direction to be wound in a spiral shape, as shown in FIG.
The flattened spiral electrode group 2 as shown in FIG.

In this electrode group 2, an active material layer-unformed portion 29 in which the negative electrode core material 24 is exposed is provided on the inner surface side of a portion corresponding to one turn of the winding start end of the negative electrode plate 20, and the positive electrode plate 19 is provided. The positive electrode core material 2 is provided on the outer surface side of the portion corresponding to one turn on the winding end side of
An active material layer-unformed portion 30 in which 2 is exposed is provided.
Further, in this electrode group 2, the negative electrode current collecting lead 12 is attached to the negative electrode core member 24 protruding in the width direction from the vicinity of the winding start end of the negative electrode plate 20, and the positive electrode protruding from the winding end end of the positive electrode plate 19. The positive electrode current collecting lead 13 is attached to the core member 22. Note that R1 to R1 shown in FIG.
Reference numeral 7 indicates the center position of the folded-back portion on the outer end side of each winding core 28A, 28B and the winding order thereof.

In FIG. 2B, it is easy to construct only the winding start portion and the winding end portion of the rectangular spiral electrode group 2 obtained by spirally winding the respective constituent elements in the arrangement of FIG. 2A. It is shown schematically for the sake of understanding. As is clear from this figure, the active material layer-unformed portions 29, 3 described above are formed.
No active material layers 27 and 23 having opposite polarities for chemically reacting are present on the side opposed to each other with the separators 21A and 21B of 0 interposed therebetween. Therefore, in the spiral electrode group 2, unnecessary active material layers 23 and 27 that do not participate in charging and discharging are reduced, and the lengths of the bipolar plates 19 and 20 are increased by the reduced amount, or the active material layer 23 is reduced. , 27 can be made thicker to increase the capacity, and both the weight energy density and the volume energy density of the battery are improved.

The feature of the non-aqueous electrolyte battery of the present invention is that the amount of the insulating protection tapes 31 and 33, which will be described later, for protecting the positive and negative electrode current collecting leads 12 and 13 is changed to the spiral electrode group 2. The configuration is reduced as much as possible corresponding to the configuration described above, and by doing so, it is possible to improve the volumetric energy density of the battery. This point will be described in detail below.

FIGS. 3 (a) and 4 (a) are plan views showing the positive and negative electrode plates 19 and 20 of the spiral electrode group 2, respectively, which are the same as FIG. 2 (a). ing. 3 (b) and 4 (b) show the positive and negative electrode plates 1 respectively.
It is the side view in which 9 and 20 were partially fractured. First, in the positive electrode plate 19 of FIG. 3, the positive electrode current collecting lead 13 has a strip-shaped insulating protection tape, as shown in the perspective view of FIG. 3C, before being joined to the positive electrode plate 19. 31 is attached in advance in such a manner that it is wound around a predetermined portion for about one round. As shown in FIG. 3B, the insulating protection tape 31 is attached to the positive electrode collector lead 13 in the vicinity of both sides of the positive electrode core material 22 with one side in the longitudinal direction sandwiched therebetween.

The thickness t1 of the insulating protection tape 31 is set to almost half of the existing tape. That is, since an existing tape having a thickness of 50 μm is generally used, the thickness t1 of the insulating protection tape 31 is set to 25 μm. Furthermore, insulation protection tape 3
1 is characterized by having a fluorescent paint (not shown). Having the fluorescent paint means both the case where the insulating protective tape 31 is formed by the tape forming material containing the fluorescent paint in advance and the case where the fluorescent paint is attached to the surface of the insulating protective tape 31 after the completion of the production. Including. In addition, in this embodiment, the width w1 of the positive electrode current collecting lead 13 is 3
The insulation protection tape 31 having a width of 5 mm and attached to the positive electrode current collecting lead 13 by winding is formed in a strip shape having a width w2 of 5 mm.

As described above, the strip-shaped insulating protective tape 31 is wound around one round and adhered to the positive electrode current collecting lead 13. The positive electrode current collecting lead 13 is attached to the positive electrode plate 19 on the side of the positive electrode plate 19 of the insulating protective tape 31. The protrusion length D1 from the side is positioned in a relative arrangement such that the protrusion length D1 is 2 mm, and the positive electrode core material 22 in the exposed state is joined by ultrasonic welding. Positive electrode current collecting lead 13 at this time
The welding portion 32 of the positive electrode core material 22 of the
It is set in the part away from the mounting point of.

In the positive electrode plate 19, the thickness of the insulating protective tape 31 is set to 25 μm, which is half the thickness of the existing insulating protective tape, and the positive electrode current collecting lead 13 is used.
Only a part, which is a peripheral portion of a portion facing the side of the positive electrode core material 22 in, is covered with the insulating protective tape 31. Therefore, the amount of the insulating protection tape 31 used for the positive electrode plate 19 is significantly reduced as compared with the insulating protection tape in the conventional negative electrode current collecting lead, and the amount of the insulating protection tape 31 used is reduced. Since the amount of the positive electrode active material layer 23 can be increased accordingly, the use of the positive electrode plate 19 makes it possible to construct a non-aqueous electrolyte battery with an improved volume energy density.

As described above, it is sufficient to cover only the adjacent portions on both sides of the positive electrode current collector lead 13 with one side of the positive electrode core member 22 in the longitudinal direction therebetween with the insulating protective tape 31 as follows. It depends on the reason. That is, in the positive electrode plate 19 of this embodiment, as shown in FIGS. 2A and 2B, the positive electrode current collecting lead 13 is located at the outermost periphery of the spiral electrode group 2, and An aluminum battery case 1 in which the outer peripheral surface of the current collecting lead 13 constitutes the same pole as the outer peripheral surface.
In addition to being able to contact and connect to the inner surface of the positive electrode, the active material layer-unformed portion 30 of the positive electrode plate 19 is arranged adjacent to the inner peripheral side of the positive electrode current collecting lead 13, and the negative electrode plate of the opposite electrode is formed. Since the 20 do not face each other, the positive electrode current collecting lead 13
This is because it is not necessary to cover the entire joint portion of the positive electrode core material 22. In other words, the positive electrode current collecting lead 13
The flash does not need to be covered and protected.

However, the positive electrode current collecting lead 13 is sealed at the tip thereof by ultrasonically welding it to the sealing plate 3 and then bending the part projecting from the positive electrode plate 19 into a folded state to be housed in the battery case 1. The plate 3 is assembled by fitting it into the opening of the battery case 1. Also, the positive electrode current collecting lead 1
3 is made of aluminum, and is very susceptible to breakage during bending as described above. Especially, the portion of the positive electrode current collecting lead 13 facing the side of the positive electrode core material 22 is bent during bending. Since it becomes the root of, the breakage easily occurs due to stress. Therefore, in the above-described embodiment, the strip-shaped insulating protection tape 31 is wound only on the vicinity of both sides of the positive electrode current collector lead 13 on both sides of the positive electrode core member 22 with one side in the longitudinal direction interposed therebetween to improve mechanical strength. It is reinforced.

On the other hand, in the conventional non-aqueous electrolyte battery, the battery case made of iron serves as the negative electrode, so that it is welded to the winding end portion of the positive electrode plate and faces the inner surface of the negative battery case. As described with reference to FIG. 6, the positive electrode current collecting lead covers almost the entire joint surface with the positive electrode core member including the portion closer to the outer side than the side edge of the positive electrode core member to cover the battery case. In addition to providing electrical insulation, a portion of the positive electrode core member 22 opposite to the positive electrode current collecting lead 13 is covered with another insulating protective tape in order to prevent the separator from being damaged by the flash of the positive electrode current collecting lead. Need to. for that reason,
In a conventional non-aqueous electrolyte battery, the amount of insulating protective tape used on the positive electrode plate is very large. Thus, the positive electrode plate 1
The large amount of the insulating protection tape used for 9 prevents the flash generated on the positive electrode current collecting lead from damaging the separator and causing an internal short circuit due to contact between the positive and negative electrode plates as described above. This is because

On the other hand, in the negative electrode plate 20 of the above embodiment, the negative electrode current collecting lead 12 is joined to the negative electrode core material 24 at the winding start end portion by resistance welding. The surface opposite to the joint surface with the material 24 is covered with the insulating protective tape 33. This insulating protection tape 33 is used for the negative electrode core material 2 in the negative electrode current collecting lead 12.
The whole of the joint surface with 4 is covered except for the portion facing the side of the negative electrode core material 24.

The insulation protection tape 33 has a thickness t2 set to about 25 μm, which is half of the existing tape thickness of 50 μm, like the insulation protection tape 31 attached to the positive electrode current collecting lead 13. In addition, it has a fluorescent paint (not shown). Having this fluorescent paint means both the case where the insulating protective tape 33 is formed by the tape forming material containing the fluorescent paint in advance and the case where the fluorescent paint is adhered to the surface of the insulating protective tape 33 after the production is completed. Including. Further, in this embodiment, the negative electrode current collecting lead 1 is used.
2 has a width w3 of 3 mm, and the insulating protective tape 33 has a strip shape having a length L of 25 mm and a width w4 of 6 mm.

In the negative electrode plate 20, the insulating protective tape 33 is used.
In addition to the thickness of 25 μm, which is half the thickness of the existing insulation protection tape,
2 only covers the surface of the negative electrode core member 24 opposite to the joint with the negative electrode core member 24 with the insulating protection tape 33, and the peripheral portion of the portion of the negative electrode current collecting lead 12 facing the side of the negative electrode core member 24. Is not covered with the insulating protective tape 33.
Therefore, the amount of the insulating protection tape 33 used for the negative electrode plate 20 is considerably reduced as compared with the conventional negative electrode plate in which both surfaces of the negative electrode current collecting lead are covered with the insulating protection tape. Since the amount of the negative electrode active material layer 27 can be increased by the amount of use of the insulating protection tape 33, the use of the negative electrode plate 20 constitutes a non-aqueous electrolyte battery with improved volume energy density. can do.

As described above, the insulating protective tape 3
Reference numeral 3 denotes a surface of the negative electrode current collecting lead 12 opposite to the surface to be joined with the negative electrode core material 24, and covers only a part except a peripheral part of a part facing the side of the negative electrode core material 24. The reason why such a configuration is made is as follows. That is, as shown in FIGS. 2A and 2B, the active material layer-unformed portions 29 of the negative electrode plate 20 are present on opposite sides of the negative electrode current collecting lead 12 and are opposite electrodes. This is because there is no positive electrode.

FIG. 5 is a side view showing an inspection process for discriminating the presence or absence of the insulating protection tapes 31 and 33 or the positional deviation, which embodies the method for manufacturing a non-aqueous electrolyte battery of the present invention. Is an insulating protective tape 31 on the positive electrode plate 19.
The inspection process of is illustrated. The positive electrode plate 19 is formed by winding and sticking the insulating protection tape 31 around the above-mentioned predetermined position of the positive electrode current collecting lead 13 and attaching the positive electrode current collecting lead 13 to the positive electrode plate 1.
It is manufactured through a process of joining to 9 by ultrasonic welding. After that, in the inspection step, the positive electrode plate 19 is attached whether or not the insulating protection tape 31 is attached to a predetermined position of the positive electrode current collecting lead 13 or the insulating protection tape 31 is displaced. It is determined by the fluorescence sensor 34 whether or not there is any.

In other words, the fluorescent sensor 34 has the insulating protection tape 31 of the positive electrode plate 19 which is manufactured and transferred.
Of the insulating protective tape 31 by irradiating ultraviolet rays to the place where should be adhered and identifying whether or not the fluorescent paint contained in the insulating protective tape 31 itself is colored in response to the ultraviolet rays. Determine the presence or absence. In addition, the fluorescence detection sensor 34 compares the amount of received white light, which is a mixture of a plurality of wavelengths reflected from the insulating protection tape 31, with a preset reference value to attach the insulating protection tape 31 to a regular position. It is determined whether or not it is worn. Therefore,
In this inspection step, even if the insulating protective tape 31 has a very thin thickness of 25 μm and thus the coloring can be seen through,
The presence / absence of the insulating protection tape 31 can be accurately determined. Moreover, since this insulating protective tape 31 only has the fluorescent paint that does not have any adverse effect on the battery, it does not adversely affect the battery due to the coloring pigment that has been applied to the conventional insulating protective tape. The problem can be resolved. Needless to say, the step of inspecting the insulating protective tape 33 on the negative electrode plate 20 is performed in the same manner as the above-described insulating protective tape 31 on the positive electrode plate 19.

[0038]

As described above, according to the non-aqueous electrolyte battery of the present invention, the insulating protective tape covering the current-collecting leads has the fluorescent paint. In the inspection for the presence / absence of the insulating protection tape, it is possible to determine the presence / absence of the insulating protection tape by detecting the fluorescent paint. Therefore, the insulation tape is
Unlike conventional insulation protective tapes, whose presence can be determined by detecting the color, it is possible to make the thickness as thin as possible, and the length of the electrode plate or active material can be reduced by the thickness of the insulation protection tape. Since the layer thickness can be set large, the volume energy density can be improved. Moreover, since the insulating protective tape only has a fluorescent paint that does not have any adverse effect when it is made into a battery, there is a problem of adverse effect on the battery due to the coloring pigment that has been applied to the conventional insulating protective tape. It can be resolved.

Further, according to the method for producing a non-aqueous electrolyte battery of the present invention, the fluorescent paint which the insulation protection tape itself has is determined by the presence or absence of the insulation protection tape of the electrode plate which is completed and transferred. Since the detection is performed by the fluorescence sensor, the presence or absence of the insulation protection tape can be accurately determined even if the insulation protection tape has a very thin thickness and the coloring is transparent.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a non-aqueous electrolyte battery according to an embodiment of the present invention.

FIG. 2 (a) is a plan view schematically showing the relative positional relationship of each constituent element before winding in the spiral electrode group of the non-aqueous electrolyte battery of the same, and FIG. 2 (b) shows each constituent element. The schematic plan view which showed typically the spiral electrode group constituted by turning.

FIG. 3 (a) is a plan view showing a positive electrode plate of the spiral electrode group of the above, FIG. 3 (b) is a side view in which a part thereof is cut away, and FIG. 3 (c) is a view of a current collecting lead before attachment to the positive electrode plate. The perspective view of a state.

FIG. 4A is a plan view showing a negative electrode plate of the spiral electrode group of the same, and FIG. 4B is a partially cutaway side view thereof.

FIG. 5 is a side view showing a process of inspecting an insulating protective tape embodying the method for manufacturing a non-aqueous electrolyte battery of the above.

FIG. 6 (a) is a side view of a conventional non-aqueous electrolyte battery in which a part of an insulating protective tape mounting portion of an electrode plate is cut away.
(B) is the sectional view on the AA line of (a).

[Explanation of symbols]

1 battery case 2 spiral electrode group 3 sealing plate 12 Negative electrode current collecting lead 13 Lead for positive electrode current collection 19 Positive plate 20 negative plate 21A, 21B separator 22 Positive electrode core material 24 Negative electrode core material 29 Negative electrode side active material layer not formed 30 Positive electrode side active material layer unformed portion 31,33 Insulation protection tape

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Claims (4)

[Claims] 1. A non-aqueous electrolyte battery in which a spirally wound electrode group is housed in a bottomed cylindrical battery case, an organic electrolytic solution is injected, and an opening of the battery case is sealed with a sealing plate. A current collecting lead is joined and attached to the positive electrode plate and the negative electrode plate of the spiral electrode group, respectively, and a joining portion of the positive electrode current collecting lead and / or the negative electrode current collecting lead to the electrode plate and its A non-aqueous electrolyte battery, characterized in that at least a portion in the vicinity thereof is covered with an insulating protective tape having a fluorescent paint. 2. The positive electrode current collecting lead is attached with an insulating protective tape in a wound state only on the vicinity of both sides of the positive electrode core member sandwiching one side in the longitudinal direction, and the negative electrode current collecting lead is The non-aqueous electrolyte battery according to claim 1, wherein an insulating protective tape is attached so as to cover the joint with the negative electrode core material. 3. The non-aqueous electrolyte battery according to claim 1, wherein the insulating protective tape has a thickness of 25 μm or less. 4. A positive electrode current collector lead and a negative electrode current collector lead are joined to a positive electrode plate and a negative electrode plate by welding, respectively, and the positive electrode current collector lead before and after the positive electrode collector plate and the negative electrode plate are joined. / Or an insulating protection tape having a fluorescent coating is attached to a predetermined portion of the negative electrode current collecting lead in a covered state, and the presence or absence or displacement of the insulating protection tape of the positive electrode plate and / or the negative electrode plate is detected by a fluorescent sensor. The spiral electrode group is formed by making a determination based on the detection of the fluorescent paint on the insulating protective tape according to the above, and spirally winding the positive and negative electrode plates with the separator interposed therebetween. A bottomed cylindrical battery case, the spiral electrode group is housed,
A method for manufacturing a non-aqueous electrolyte battery, which comprises injecting an organic electrolyte solution and sealing the opening of the battery case with a sealing plate.