JP2002042859A - Alkaline secondary battery and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a spiral electrode body of high volume efficiency at high productivity by preventing the generation of winding deviation and by reducing a short circuit generation rate when manufacturing the spiral electrode body for an alkaline secondary battery using a film type separator. SOLUTION: A pin portion of a wind core 50 is inserted into a wind start portion 12 of a separator 11 to jointly clamp the separator 11 and a frictional sheet body and start the winding. The frictional sheet body 20 has a surface whose friction coefficient to the surface of a positive electrode plate 30 is larger than that to the surface of the separator 11. When one ends 21 and the other end 22 of the frictional sheet body 20 approach to each other as mutually stacked with each other, the wind start end 31 of the positive electrode plate 30 is inserted between the end 21 and the end 22 go that the end 31 of the positive electrode plate 30 is sandwiched between the end 21 and the end 22 of the frictional sheet body 20 and the end 41 of the negative electrode is sandwiched between a separator portion 11a and a separator portion 11b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkaline secondary battery provided with a power generating element in which a spiral electrode body is impregnated with an alkaline electrolyte, and a method of manufacturing the same.

[0002]

2. Description of the Related Art At present, alkaline secondary batteries such as nickel-cadmium storage batteries and nickel-hydrogen storage batteries are used in various devices including portable devices. In this alkaline secondary battery, a spiral electrode body formed by winding a positive electrode plate and a negative electrode plate through a separator is provided with a power generator element impregnated with an alkaline electrolyte, and the power generator element is housed in an outer can. Typically, the outer can has a structure in which the opening is sealed with a sealing lid.

The positive electrode plate constituting the spiral electrode body is made of nickel hydroxide as an active material, the negative electrode plate is made of cadmium hydroxide or a hydrogen storage alloy as an active material. Nonwoven fabrics are widely used. A spiral electrode body is generally manufactured using a split pin-shaped core or a core composed of a pair of pins, and is manufactured by winding a positive electrode plate and a negative electrode plate while winding a separator around the core. .

By the way, in such an alkaline secondary battery, it is required to increase the capacity per volume, that is, the volume efficiency, and therefore, it has been proposed to use a film separator instead of a nonwoven fabric as a separator. ing. Since a film-like separator can maintain its strength as a separator even when thinner than a nonwoven fabric, the use of a film-like separator in an alkaline secondary battery is advantageous in increasing the volumetric efficiency of the battery.

[0005]

However, in the case of an alkaline secondary battery, the thickness of the electrode plate is relatively large, and the friction between the electrode plate and the film separator is small.
When a spiral electrode body is formed using a film-like separator, a winding displacement of the electrode plate occurs at the beginning of the winding,
As a result, there is a problem that contact between the electrode plates and short-circuit easily occur.

Japanese Patent Application Laid-Open No. 47-50417 discloses a technique for preventing short-circuiting in a spiral electrode body, in which one end of a synthetic resin reinforcing sheet covers one end of a band-shaped electrode group, It is described that the end is inserted into the groove of the winding rod and wound, and according to this method,
It is considered that an effect of preventing damage to the electrode at the beginning of winding and preventing short-circuiting is exerted.

Japanese Patent Application Laid-Open No. 63-1525884 discloses that, when a positive electrode plate and a negative electrode plate are wound via a separator, an alkali-resistant adhesive tape is applied to the beginning of winding of the separator prior to the start of winding. Is disclosed, and it is considered that the effect of reinforcing the separator is exhibited if this technology is used. However,
Even if these techniques are used, when a film-like separator is used, slippage of the electrode plate at the beginning of winding cannot be eliminated, so that winding deviation of the electrode plate is apt to occur, and short-circuit due to it is liable to occur. Expected.

The present invention has been made in view of the above problems, and when a spiral electrode body for an alkaline secondary battery is manufactured using a film-like separator, the occurrence of short-circuit is reduced by preventing the occurrence of winding deviation. Accordingly, it is an object to manufacture a spiral electrode body having high volume efficiency with high productivity.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for manufacturing a spiral electrode body by winding a positive electrode plate and a negative electrode plate through a film separator. A sheet having a surface having a larger coefficient of friction with respect to the positive or negative electrode plate surface than the film-like separator surface is fixed to the winding start portion, and the end of the positive or negative electrode plate is brought into contact with the sheet surface. It was decided to be wound.

[0010] By winding as described above, it is possible to prevent slippage between the electrode plate facing the sheet member and the film separator at the beginning of winding. Therefore, it is possible to suppress the occurrence of the winding deviation at the winding start portion and reduce the short-circuit occurrence rate. Here, if a non-woven fabric is used as the sheet body, a particularly large roll deviation preventing effect can be obtained.

Further, at the beginning of the winding, the laminated film separator and the sheet body are wound around a core, and the end of the electrode plate at the beginning of the winding is sandwiched by the sheet body. It is possible to more effectively prevent the electrode plate from slipping, thereby improving the effect of preventing winding deviation. In addition, if the sheet body is bonded to the film separator in advance, the sheet body and the film separator do not slip at the beginning of winding, so that the effect of preventing the winding deviation can be enhanced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a spiral electrode body according to the present invention and a method for manufacturing a battery using the same will be described with reference to the drawings. 1 and 2 are a perspective view and a cross-sectional view for explaining a step of manufacturing a spiral electrode body.

In FIG. 1, reference numeral 10 denotes a roll formed by winding a film-like separator material, and reference numeral 50 denotes a core. Since this film-shaped separator material has the same strength even if the thickness (basis weight) is smaller than the nonwoven fabric conventionally used for the separator, it is suitable for manufacturing an alkaline secondary battery having high volume efficiency. I have.

Here, as the film-like separator material,
Specifically, a polyethylene film that has been partially hydrophilized is used, but the same can be performed using another type of film separator. As the core 50, a split pin is used here.
As described in Japanese Patent No. 558, the present invention can be similarly carried out by using a core composed of a pair of pins.

It has been conventionally performed to manufacture a spiral electrode body by winding the positive electrode plate 30 and the negative electrode plate 40 through the separator 11 fed from the roll 10 using the winding core 50. It is the same as the manufacturing method of the spiral electrode body. However, in the present embodiment, as described below, the coefficient of friction with respect to the surface of the positive electrode plate 30 between the separator 11 and the positive electrode plate 30 is larger than the surface of the separator 11 at the beginning of the winding. The slip between the positive electrode plate 30 and the separator 11 is suppressed by interposing the friction sheet member 20 made of a sheet member having a surface, thereby preventing the positive electrode plate 30 from slipping.

Hereinafter, the steps of manufacturing the spiral electrode body will be described in order with reference to FIGS. Adhesion of friction sheet body: As shown in FIGS. 1A and 1B, a separator material is fed from a roll 10 and a fed separator 11 is provided.
Then, the friction sheet body 20 is overlaid. In the figure, figure number 14
Is a feeding end portion of the separator 11. Separator 1
1 is a position where the friction sheet body 20
Is inserted to start winding 12. Then, the friction sheet body 20 and the separator 11 are bonded by heat fusion.

As described above, the material of the friction sheet body 20 is a sheet having a larger coefficient of friction with respect to the surface of the positive electrode plate 30 than the surface of the separator 11 and does not adversely affect battery performance. Use something.
As a specific example of this material, organic fiber nonwoven fabric (polyamide fiber nonwoven fabric or polyolefin fiber nonwoven fabric including polypropylene fiber nonwoven fabric) conventionally used as a separator material for alkali secondary is
A relatively high coefficient of friction with the electrode plate surface is obtained,
Since it is durable and has low cost in an alkaline secondary battery, it is desirable to use it.

As another example, a resin film (polyethylene film, polypropylene film) whose surface has been roughened by sanding or embossing roller treatment may be used. The size of the friction sheet body 20 is
Any material that can be interposed between the end portion of the positive electrode plate 30 and the separator 11 when wound around the positive electrode plate 30 may be used.
In the present embodiment, in order to increase the slip prevention effect of 0, the length L of the separator 11 in the longitudinal direction is set.
1 secures a length enough to sandwich the end of the positive electrode plate 30 when sandwiched by the winding core 50 in the winding step to be described later, and a length L2 in a direction along the width direction of the separator 11. Is set to a length substantially equal to that of the positive electrode plate 30.

The bonding between the friction sheet body 20 and the separator 11 is performed by heating the adhesive area 13 of the separator 11 indicated by oblique lines in FIG. Here, this bonding may be performed using an adhesive such as a silicon-based adhesive, but the bonding by fusion as described above can be performed in a short time and the spiral electrode This is preferable in that no adhesive remains in the body.

Core Separation by Core: As shown by the arrow A in FIG. 1B, the core 50 is inserted, and the winding start portion 12 of the separator 11 is fitted into the split groove. As a result, the separator 11 and the friction sheet body 20 are held together by the split pins (see FIG. 2A). here,
In the unrolled separator 11, the roll 10 side is separated from the portion sandwiched by the core 50 by the separator portion 11.
a, the end portion 14 side of the portion sandwiched by the core 50 is referred to as a separator portion 11b.

Winding step: The winding of the separator 11 is performed by rotating the winding core 50 in the direction of arrow B in the figure.
At this time, the separator 1 is separated from the roll 10 in accordance with the winding.
While feeding 1, the tension is applied to the separator portion 11a between the roll 10 and the core 50, and the winding is performed while applying tension to the separator portion 11a between the end portion 14 and the core 50.

When the winding is started, as shown in FIGS. 2B and 2C, the separator 11 and the friction sheet 20
Is wound around the winding core 50, and the one end 21 and the other end 22 of the friction sheet body 20 approach each other so as to overlap each other. At this time, the winding start end 31 of the positive electrode plate 30
As shown by an arrow C in FIG.
And between the end 22. At the same time, the negative electrode plate 40
2 is inserted between the separator portion 11a and the separator portion 11b as indicated by an arrow D in FIG. 2B.

Thus, FIG. 1 (c) and FIG.
As shown in (c), the end 31 of the positive electrode plate 30 is sandwiched between the end 21 and the end 22 of the friction sheet body 20,
The end 41 of the negative electrode plate 40 is sandwiched between the separator portion 11a and the separator portion 11b. Then, when the winding is further performed, the end 31 of the positive electrode plate 30 is sandwiched between the end 21 and the end 22 of the friction sheet body 20, as shown in FIGS. The negative electrode plate 40 is caught between the separator portion 11a and the separator portion 11b as it is.
Outside the positive electrode plate 30, the separator portion 11a
And the separator portion 11b.

Completion of spiral electrode body: and positive electrode plate 30
When the winding of the negative electrode plate 40 is completed, the separator portion 1
By cutting the winding end portion in 1a and extracting the winding core 50, a spiral electrode body is completed. By repeating the above steps, a spiral electrode body can be continuously produced.

The spiral electrode body manufactured in this manner has an end 3 of the positive electrode plate 30 at the beginning of winding.
The friction sheet body 20 remains in a state where the friction sheet body 20 is interposed between the first and the separators 11, and the friction sheet body 20 sandwiches the end 31 of the positive electrode plate 30. (Manufacture of Battery) The spirally wound electrode body produced as described above is housed in an outer can, and an alkaline electrolyte is injected into the spirally wound electrode body so that the spirally wound electrode body contains the alkaline electrolyte. The alkaline secondary battery is manufactured through the step of sealing the battery.

(Explanation of Operation and Effect of Friction Sheet Body 20) In the above-mentioned method of manufacturing a spiral electrode body, if the friction sheet body 20 is not used, the end 31 of the positive electrode plate 30 is separated from the separator portion 11a and In this case, the winding is performed while being directly sandwiched between the separator portions 11b. In this case, the friction coefficient between the surface of the positive electrode plate 30 and the surface of the separator 11 is relatively small, so that the positive electrode plate 30 is slippery. Relatively easy to occur.

On the other hand, according to the method for manufacturing the spiral electrode body, the friction sheet body 20 is interposed between the separator 11 and the positive electrode plate 30 at the beginning of winding, and the surface of the friction sheet body 20 is formed. 20 a (specifically, the surface of the positive electrode plate 30 facing the end 31) has a larger coefficient of friction with respect to the surface of the positive electrode plate 30 than the surface of the separator 11. Between the friction sheet member 20 and the separator 11. Therefore, the winding displacement of the positive electrode plate 30 hardly occurs.

In the above manufacturing method, the winding start end 31 of the positive electrode plate 30 is sandwiched between the end 21 and the end 22 of the friction sheet body 20, that is, both surfaces of the end 31 are gripped. Since the film is wound in a state, a particularly large effect of preventing a winding deviation can be obtained. That is, even if the friction sheet body 20 is brought into contact with only one side surface of the end portion 31 of the positive electrode plate 30, an effect of preventing a certain degree of winding deviation can be obtained, but the above-described manufacturing method is more effective.

(Regarding Modifications) In the above-described method for manufacturing a spiral electrode body, the friction sheet body 20 and the separator 11 are bonded to each other, and then the winding is performed. Even if the friction sheet body 20 and the separator 11 are simply overlapped without being bonded, the friction sheet body 20 and the separator 11 are wound around the core, so that they are less likely to slip and shift. Therefore, it is possible to suppress the winding displacement of the positive electrode plate 30.

However, if the friction sheet member 20 and the separator 11 are bonded together as in the above-described method for manufacturing a spiral electrode body, the friction sheet member 20 and the separator 11 are not displaced from each other, which is more preferable. . Further, in the method of manufacturing the spiral electrode body, winding is started by sandwiching the portion where the friction sheet body 20 and the separator 11 are overlapped with the core, but the friction sheet body 20 and the separator 11 are overlapped. If they are laminated, it is not always necessary to sandwich the overlapped portion with the core, and the same operation can be performed even if only the separator 11 is sandwiched between the cores.

In the above method for manufacturing a spiral electrode body, the separator 11 and the positive electrode plate 3 are provided at the beginning of winding.
0, the winding of the positive electrode plate 30 is prevented by inserting the friction sheet member 20 between the separator 11 and the negative electrode plate 40 at the winding start portion. The insertion can also prevent the negative electrode plate 40 from being misaligned. In that case, specifically,
At the winding start point 12 in FIG.
A friction sheet may be attached also to the back side of 1.

When the friction sheet member is inserted only on the negative electrode plate 40 side without inserting the friction sheet member on the positive electrode plate 30 side, the winding displacement of the negative electrode plate 40 can be prevented. When the friction sheet member is inserted only on one of the electrodes, the friction sheet member may be inserted on the electrode on the side where the winding deviation is likely to occur, but generally, the friction sheet member is inserted from the negative electrode plate. It can be seen that the positive electrode plate wound inside also tends to cause winding misalignment, so it is better to insert the friction sheet body only on the positive electrode plate side than to insert the friction sheet body only on the negative electrode plate side, It is considered that a short-circuit prevention effect is easily obtained.

In the above-described embodiment, an example in which a spiral electrode body of a cylindrical nickel-hydrogen storage battery is manufactured has been described. However, a spiral spiral electrode for a nickel-cadmium storage battery and other types of alkaline secondary batteries can be used. The same applies to the case of producing an electrode body. (Other matters) As a related technology, Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No.-299120 discloses a technique in which a portion of a separator that is in contact with a split pin is heat-treated at a temperature equal to or higher than its softening point and lower than a melting point before the separator is inserted into a split groove of the split pin. A technique has been disclosed in which a core can be easily pulled out by fixing a reinforcing film to a portion in contact with a split pin via an adhesive layer, but the reinforcing film has high friction between an electrode plate. It is considered that the electrode plate and the separator are likely to be slippery at the beginning of winding when the film is wound by this technique using a film-like separator because the electrode plate has no property.

[0034]

EXAMPLES (Example 1) A spiral electrode body was manufactured based on the manufacturing method of the above embodiment. The film separator is
A polyethylene film having a thickness of 50 μm and subjected to a partial hydrophilic treatment was used.

As the positive electrode plate 30, a sintered nickel electrode plate,
As the negative electrode plate 40, a metal hydride electrode plate was used. In addition,
In order to prevent a short circuit, the winding start side end 3 of the positive electrode plate 30
An insulating tape was stuck on 1. Friction sheet body 20
Used a polypropylene fiber non-woven fabric (0.1 mm in thickness).

Then, using this spiral electrode body, SC
A cylindrical nickel-hydrogen storage battery A having a size was produced. (Example 2) A spiral electrode body was produced in the same manner as in Example 1 above, but instead of fusing the friction sheet body 20 to the separator 11, it was bonded using a silicon-based adhesive.

Then, by using this spiral electrode body, SC
A cylindrical nickel-hydrogen storage battery B having a size was produced. (Example 3) A spiral electrode body was manufactured in the same manner as in Example 1 above, but the friction sheet body 20 was wound only in an overlapping state without being bonded to the separator 11.

Then, using this spiral electrode body, SC
A cylindrical nickel-hydrogen storage battery C having a size was produced. (Example 4) A spiral electrode body was produced in the same manner as in Example 1 above, except that a friction sheet body 20 which had been subjected to a surface roughening treatment on a polyethylene film equivalent to a film separator in place of a nonwoven fabric was used. Was. By thus roughening the surface of the polyethylene film, the coefficient of friction with respect to the electrode plate surface becomes larger than that of the original polyethylene film surface.

Then, using this spiral electrode body, SC
A cylindrical nickel-hydrogen storage battery D having a size was produced. (Comparative Example 1) A spiral electrode body was produced in the same manner as in Example 1 above, but without using a friction sheet body, instead of a polyethylene film as a separator material, the thickness was equivalent to a film-like separator (50 µm). Was used. Using this spiral electrode body, a cylindrical nickel-hydrogen storage battery E of SC size was manufactured.

Comparative Example 2 A spiral electrode body was produced in the same manner as in Example 1 except that no friction sheet body was used. Then, using this spiral electrode body, a cylindrical nickel-hydrogen storage battery F of SC size was produced.

(Comparative Example 3) A spiral electrode body was produced in the same manner as in Example 1, but instead of the friction sheet body made of non-woven fabric, a sheet body made of a material equivalent to the polyethylene film used for the separator was used. This was interposed between the separator and the positive electrode plate at the beginning of winding.

Using this spiral electrode body, SC
A cylindrical nickel-hydrogen storage battery G having a size was produced. (Experiment) With respect to the spiral electrode bodies manufactured by the methods of Examples 1 to 4 and Comparative Examples 1 to 3, the occurrence rate of the winding deviation and the occurrence rate of the short circuit were measured.

In this measurement method, 100 spiral electrode bodies were manufactured, and the number of winding deviations which were recognized as having occurred was visually checked with respect to the occurrence ratio of the winding deviation. This was performed by examining the number of spiral electrode bodies in which contact with the negative electrode plate was recognized. Table 1 shows the results of this experiment, in which the number of batteries in which a short-circuit occurred but no displacement occurred, the number of batteries in which a short-circuit occurred and a displacement occurred, and
The figure shows the number of batteries in which a short-circuit has not occurred but a winding gap has occurred, and further shows the total number of batteries in which a short-circuit has occurred and the total number of batteries in which a winding gap has occurred.

[0044]

[Table 1] (Discussion) The following is considered from the results in Table 1. * In all of Examples 1 to 4, the occurrence of winding deviation is considerably smaller than in Comparative Examples 2 and 3. This indicates that when a spiral electrode body is manufactured using a film-like separator, the use of a friction sheet body made of a nonwoven fabric or a film having a roughened surface can prevent winding deviation.

In Comparative Examples 2 and 3, the cause of the occurrence of winding deviation during winding was observed. Poor engagement of the positive electrode plate, that is, friction between the positive electrode plate and the film-like separator was small. It was found that the main cause was that the positive electrode plate slipped out. From this, Examples 1 to
It can be seen that when the friction sheet body is used as in No. 4, the positive electrode plate is prevented from slipping at the beginning of winding, thereby preventing winding deviation. * In both Example 1 and Example 2, the occurrence of short-circuit and the occurrence of winding deviation are small, and there is no difference between the two.

However, in the second embodiment, compared to the first embodiment,
Since it takes time for the adhesive to solidify, much production time was required. * In Examples 1 and 2, the occurrence of short-circuit and the occurrence of winding deviation are smaller than those in Example 4. This is a friction sheet
This shows that the nonwoven fabric has a greater effect of preventing the winding displacement than the film having a roughened surface. * In Examples 1 and 2, the occurrence of short-circuit and the occurrence of winding deviation are smaller than those in Example 3. This is because the friction sheet body and the separator did not adhere to each other at the time of starting winding, so that a slight slippage occurred between the two. It is considered that since the separator and the separator were bonded, no slippage between them occurred. * In Comparative Example 1, the occurrence of winding deviation is almost as small as in Examples 1 to 4, but the occurrence of short circuit is considerably larger than in Examples 1 to 4. This is because the non-woven fabric having a large friction is used for the separator itself in Comparative Example 1, so that the winding displacement hardly occurs. It is considered that the strength of the separator was insufficient, so that the burr of the electrode plate easily penetrated the separator. * Comparing Comparative Example 2 with Comparative Example 3, short-circuit occurrence is smaller in Comparative Example 3 than in Comparative Example 2. The number is larger than that of Comparative Example 2.

This is because even if a sheet body is used in the winding start portion in Comparative Example 3, if the surface of the sheet body does not have a larger friction coefficient with respect to the electrode plate than the surface of the separator, the occurrence of winding deviation is prevented. This indicates that no effect can be obtained.

[0048]

As described above, in manufacturing an alkaline secondary battery, when a positive electrode plate and a negative electrode plate are wound through a film-like separator to produce a spiral electrode body, the film-like separator is used. A sheet having a surface having a larger coefficient of friction with respect to the positive or negative electrode plate surface than the film-like separator surface is fixed to the winding start portion, and the end of the positive or negative electrode plate is brought into contact with the sheet surface. By winding, it is possible to prevent slippage between the electrode plate and the film-like separator facing the sheet body at the beginning of winding, thereby suppressing occurrence of winding deviation at the beginning of winding and occurrence of short circuit in the battery. Rate can be reduced.

When the present invention is used to produce an alkaline secondary battery, it is possible to produce an alkaline secondary battery having high volumetric efficiency and to reduce the occurrence of a defective rate, which is of great practical value.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a step of manufacturing a spiral electrode body in one embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a step of manufacturing a spiral electrode body in one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Roll 11 Separator 11a, 11b Separator part 12 Winding start point 20 Friction sheet body 30 Positive electrode plate 40 Negative electrode plate 50 Core

Claims (8)

[Claims] An alkali having a power generating element in which a spiral electrode body obtained by winding a first electrode plate and a second electrode plate having a polarity opposite to the first electrode plate via a film separator is impregnated with an alkaline electrolyte. In the secondary battery, a sheet having a surface having a larger coefficient of friction with respect to the surface of the first electrode plate than the surface of the film separator is interposed between the first electrode plate and a winding start portion of the film separator. An alkaline secondary battery, comprising: 2. The alkaline secondary battery according to claim 1, wherein the sheet body exists so as to sandwich an end of the first electrode plate at a winding start side. 3. The alkaline secondary battery according to claim 1, wherein the sheet is a non-woven fabric. 4. The alkaline secondary battery according to claim 1, wherein the sheet is bonded to the film-like separator. 5. A winding step of forming a spiral electrode body by winding a first electrode plate and a second electrode plate having a polarity opposite to the first electrode plate through a film separator using a winding core; Impregnating the spiral electrode body with an alkaline electrolyte to form a power generating element, wherein the winding step comprises: winding the film-like separator. At the beginning, a sheet having a surface having a higher coefficient of friction with respect to the surface of the first electrode plate than the surface of the film-like separator is fixed, and winding is performed in a state where the end of the first electrode plate is in contact with the surface of the sheet. A method for manufacturing an alkaline secondary battery, comprising: rotating the battery. 6. In the winding step, the film-shaped separator and the sheet member are overlapped, and the first electrode plate and the sheet-like member are wound while the stacked film separator and sheet member are wound around the core. The method for manufacturing an alkaline secondary battery according to claim 5, wherein a bipolar plate is involved. 7. In the winding step, the laminated film-like separator and a sheet body are wound around the winding core, and at the beginning of winding, the end of the first electrode plate is sandwiched by the sheet body. The method for producing an alkaline secondary battery according to claim 6, wherein: 8. The production of an alkaline secondary battery according to claim 5, wherein in the winding step, the sheet body is attached to the film separator and then attached to a core. Method.