JPH11273631A - Alkaline secondary battery and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alkaline secondary battery which is relatively lightweight and excellent in heat radiation. SOLUTION: The outer can 10 of an alkaline secondary battery 1 is made of a metallic plate 11 formed in the shape of a deep-bottomed rectangular tube and is covered with an alkali-resistant resin layer 12 on its inner surface. A sealing lid 20 has a similar structure and a metallic plate 21 formed in the shape of a shallow-bottomed rectangular tube is covered with an alkali resistant resin layer 22 on its inner surface. The open edge 13 of the outer can 10 and the open edge 23 of the sealing lid 20 are both bent in such a way as to project outward, and are joined together by thermal fusion. By caulking and pressing these parts together, pressure resistance is greatly enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed alkaline secondary battery, and more particularly to an improvement in an outer container thereof.

[0002]

2. Description of the Related Art Alkaline secondary batteries are housed in an outer container.
It has a structure in which a positive electrode and a negative electrode are stacked via a separator, and an electrode body impregnated with an alkaline electrolyte is housed. The outer container is made of a material that withstands the rise in internal pressure due to battery charging and discharging and the heat generated during charging.For small alkaline secondary batteries, stainless steel and other corrosion-resistant metals or nickel-plated steel plates Such metal products are often used.

On the other hand, in the case of a large-sized prismatic alkaline secondary battery for an electric vehicle or the like, a resin outer container is used in consideration of alkali resistance, minimizing the weight of the battery and easiness of manufacture. Widely used. As the type of the resin, polypropylene or ABS resin is mainly used, and recently, an alloy resin obtained by mixing these resins is also used.

[0004] The use of an outer container made of resin is certainly advantageous in that it is lightweight and easy to manufacture.

[0005]

The alkaline secondary battery generates heat during charging, and therefore needs to be cooled. However, since the resin-made outer container has poor thermal conductivity, it is difficult to cool the battery. is there. In particular, in the case of square alkaline secondary batteries for electric vehicles, a plurality of batteries are arranged side by side and electrically connected to each other, so that the temperature of the battery located at the center tends to increase.

To solve such a problem, Japanese Patent Application Laid-Open No. 7-22 / 1995
No. 003 proposes a battery in which a plurality of cells are housed in a storage container having a monoblock structure having a partition plate, wherein the container body and the partition plate are formed of aluminum and coated with an alkali-resistant resin. In the case of this battery, although the cooling effect is improved to some extent due to the improvement in heat conductivity, heat dissipation from the central portion is difficult due to the structure, so that the problem that the temperature rises easily in the central portion during charging is considered to remain to some extent. .

[0007] In view of the above problems, an object of the present invention is to provide an alkaline secondary battery that is relatively lightweight and has excellent heat dissipation.

[0008]

In order to achieve the above-mentioned object, in the alkaline secondary battery of the present invention, the outer can is made of metal, and the inner surface thereof is covered with an alkali-resistant resin layer. According to this configuration, the outer can is relatively lightweight, and has excellent heat dissipation compared to the case of the resin outer can.

Further, the pressure resistance can be greatly improved. Here, the lid for closing the opening of the outer can may also be made of metal and its inner surface may be covered with an alkali-resistant resin layer. In this case, the edge of the outer can and the edge of the lid facing the outer can can both be folded outward and joined by welding the resin layers at the edges.

As a preferable resin constituting the resin layer,
Polypropylene, polyethylene, polystyrene, copolymer of modified polyphenylene ether and polystyrene, AB
S resin, acrylonitrile styrene resin, polyamide,
Examples include vinyl chloride resin, vinylidene chloride resin, methacrylic resin, and mixtures thereof. The thickness of the resin layer is preferably from 10 μm to 200 μm.

It is preferable to use aluminum or an aluminum alloy as the metal of the outer can in terms of reducing the weight of the battery. Such an alkaline secondary battery was formed into a cylindrical shape such that the resin layer was on the inside by using a pre-coated plate in which an alkali-resistant resin layer was formed on one side of a metal plate to form an outer can. It can be easily manufactured by a manufacturing method including a step of storing an electrode body in an outer can and a step of closing an opening of the outer can with a lid.

Here, the lid can also be manufactured by molding a precoated plate in which one surface of a metal plate is coated with an alkali-resistant resin layer. The exterior can and the lid can be joined by welding the resin layers to each other.

[0013]

FIG. 1 is a perspective view of a prismatic alkaline secondary battery according to the present embodiment, and FIG. 2 is a sectional view taken along line XX of FIG. It is a line sectional view. FIG. 3 is an assembly diagram of the alkaline secondary battery.

As shown in FIG. 1, the alkaline secondary battery 1 includes a positive electrode plate 31 and a positive electrode plate 31 in a space surrounded by a rectangular outer casing 10 having a bottom and a sealing lid 20 for sealing the opening thereof. A negative electrode plate 32 is stacked with a separator 33 interposed therebetween and is filled with an electrode plate group 30 impregnated with an alkaline electrolyte. The outer can 10 is made of a metal plate 11 molded into a deep-bottomed rectangular tube, the inner surface of which is covered with an alkali-resistant resin layer 12, and the outer surface of the metal plate 11 is exposed.

The sealing lid 20 has a similar structure, in which a metal plate 21 formed into a shallow, bottomed rectangular tube is covered with an alkali-resistant resin layer 22. The sealing lid 20 has poles 41 and 42 serving as positive and negative terminals.
And a safety valve 49 is attached. The opening edge 13 of the outer can 10 and the opening edge 23 of the sealing lid 20 are both bent so as to protrude outward to form a flange shape, and the opening edges 13 and 23 are joined by welding. .

The electrode group 30 and the alkaline electrolyte include:
Although what is used in a normal prismatic alkaline secondary battery can be used, here, the positive electrode plate 31 impregnates a porous nickel core with an active material mainly composed of slurry nickel hydroxide, The rolled negative electrode plate 32 is formed by applying an active material mainly composed of a hydrogen storage alloy to a punched nickel core, and a potassium hydroxide-based electrolyte is used as the alkaline electrolyte.

A current collecting tab 35 made of a thin nickel plate is mounted on the upper part of each positive electrode plate 31, and a similar current collecting tab 36 is mounted on the upper part of each negative electrode plate 32. The comb slits 37, 38 are connected to the poles 41, 42. The poles 41 and 42 penetrate through holes 24 and 25 formed in the sealing lid 20, and nuts 43 and 44 are screwed into screws engraved on the poles and tightened to be fixed to the sealing lid 20. ing.

Insulating sheets 45 and 46 are interposed between the nuts 43 and 44 and the surface of the sealing lid 20, so that they are insulated from each other. Further, since the resin layer 22 of the sealing lid 20 also covers the inner peripheral surfaces of the holes 24 and 25 as shown in FIG. 2A, insulation between the pole columns 41 and 42 and the sealing lid 20 is ensured. I have. Further, O-rings 47 and 48 are inserted into the bases of the poles 41 and 42, and holes 24 and 25 are provided.
Are sealed with the inner peripheral surface of the.

The safety valve 49 is a known valve which operates when the internal pressure of the battery reaches a specified pressure (for example, 3 kg / cm ² ). The safety valve 49 is formed of an alkali-resistant resin.
Is installed in the hole 26 established in the first embodiment. [Regarding Configuration of Outer Can 10 and Sealing Lid 20] Metal Plate 1
1 and the metal plate 21 are preferably made of Al-Cu
-Mg alloy, Al-Mn alloy, Al-Si alloy,
Al-Mg based alloy, Al-Mg-Si based alloy, Al-Z
Light metal alloys such as an n-Mg alloy can be given.

The thickness of the metal plate 11 and the metal plate 21 is set to 0. 0 in consideration of the strength and weight of the outer can 10 and the sealing lid 20.
It is preferable to set the range of 2 mm to 2.0 mm.
The resin layer 12 and the resin layer 22 are formed of an alkali-resistant resin in order to prevent the alkaline electrolyte from coming into contact with the metal plate 11 and the metal plate 21. Preferred resins include polypropylene, polyethylene, polystyrene, and the like. Copolymer of modified polyphenylene ether and polystyrene,
ABS resin, acrylonitrile styrene resin, polyamide, vinyl chloride resin, vinylidene chloride resin, and methacrylic resin can be exemplified.

These resins have different properties such as strength and heat resistance, but an appropriate resin may be selected according to the electrolytic solution used, the operating conditions of the battery, and the like. In addition, by mixing these resins, it is possible to obtain a resin having characteristics different from those of the original resin. By configuring the outer can 10 and the sealing lid 20 in such a manner, the outer can 10 and the sealing lid 20 can be made relatively lightweight and strong, the inner surface can be made alkali-resistant, and the thermal conductivity can be made good.

The thickness of the resin layer 12 and the resin layer 22 is preferably 10 μm to 200 μm in consideration of the thermal conductivity of the outer can 10 and the sealing lid 20 and the strength of the resin layer.
That is, when the thickness exceeds 200 μm, the thermal conductivity becomes low. On the other hand, when the thickness is less than 10 μm, the strength of the resin layer is low, and the metal plates 11 and 21 are likely to be corroded by contact with the alkaline electrolyte.

The resin layer 12 and the resin layer 22 may have a two-layer structure. In this case, the metal plate 11 and the metal plate 21
If a resin having excellent weldability (even if the strength is low) is used for the lower layer and a resin having high strength (even if the weldability is inferior) is used for the upper layer, the resin layer 1 having high strength and excellent weldability is used.
2 and a resin layer 22. That is, with such a two-layer structure, it is possible to widen a selection range of a material used for obtaining characteristics required for the resin layer 12 and the resin layer 22.

The alkaline secondary battery 1 having such a configuration is
Compared to a conventional case using a resin-made exterior container, the thermal conductivity is good, the strength is excellent, and there is no significant difference in weight. By the way, this alkaline secondary battery 1
It is used as a power source for an electric vehicle. In practice, a plurality of alkaline secondary batteries 1 are arranged, and the pole columns 41 and 42 are connected in series.

When a plurality of prismatic alkaline rechargeable batteries are arranged and used as described above, the temperature of the battery located at the center tends to be particularly high.
Then, when arranging a plurality of batteries, if the batteries are arranged with a slight interval between them, the batteries in the center can be cooled well, so that the temperature rise of the batteries during charging can be avoided, and the original battery It is possible to demonstrate performance.

In the case of the above-described battery disclosed in Japanese Patent Application Laid-Open No. 7-22003, it is considered that the energy density and heat dissipation are improved as compared with the case of the resin-based battery. It is considered that the heat dissipation at the center is inferior. [Battery manufacturing method] Alkaline secondary battery 1 Alkaline secondary battery 1
The production method will be described.

Preparation of Outer Can 10 The outer can 10 is prepared by laminating a resin layer 12 on a metal plate 11 to prepare a precoated plate, punching the precoated plate into a predetermined shape (rectangular shape), and performing transfer drawing. It is manufactured by molding into a bottom square cylindrical shape (flange shape). In this transfer drawing, a steel plate is drawn and ironed stepwise using a punch and an ironing die.
During this processing, the metal plate 11 is partially stretched,
The resin layer 12 is also stretched following the growth of the metal plate 11.

Preparation of Sealing Cover 20 The sealing cover 20 is manufactured by stamping and forming a precoated plate similar to the above, in which a resin layer 22 is laminated on a metal plate 21, into a flange shape. At the time of this punching, punching is performed from the resin layer 22 side to the metal plate 21 side so that the inner peripheral surfaces of the holes 24, 25 and 26 are also covered with the resin layer 22.

Preparation of Electrode Group 30 A current collecting tab 35 is mounted on the positive electrode plate 31 and a current collecting tab 36 is mounted on each negative electrode plate 32. Then, this positive electrode plate 31
The electrode plate group 30 is manufactured by alternately laminating the negative electrode plates 32 with the separator 33 interposed therebetween. Each current collecting tab 3
5 and 36 are passed through the comb slits 37 and 38 and spot-welded thereto.
38 is welded to the poles 41 and 42.

Assembly of Battery The electrode group 30 is housed in the outer can 10. And pole 4
The O-rings 47 and 48 are inserted into the sealing lids 20 and 21, respectively.
Through the holes 24 and 25, the insulating sheets 45 and 46 are inserted into the screws, and tightened with the nuts 43 and 44. Next, the opening edge 1
The resin layer 12 and the resin layer 22 are heat-sealed and sealed by heating the portion with the heater 3 and the opening edge portion 23 facing each other. The resin layer 12 and the resin layer 22 are ultrasonically irradiated.
May be welded.

Then, an alkaline electrolyte is injected from the hole 26 of the sealing lid 20, and a safety valve 49 is attached to the hole 26 and sealed. In order to increase the airtightness of this portion, the sealing lid 20 and the inner peripheral surface 22a of the holes 24 and 25 may be welded. According to the manufacturing method using the pre-coated plate as described above, the alkaline secondary battery 1 can be manufactured by a relatively simple process.

That is, the outer can 10 can be manufactured by forming the metal plate 11 by drawing and then coating the resin layer 12. In this case, the resin layer 12 is formed. On the other hand, if the pre-coated plate is first prepared and molded, the formation of the resin layer 12 is easy. [Second Embodiment] FIG. 4 is a sectional view showing a sealing method for an alkaline secondary battery according to the present embodiment.

The alkaline secondary battery of the present embodiment has the same configuration as the alkaline secondary battery 1 of the first embodiment,
When closing the opening of the outer can 10 with the sealing lid 20, FIG.
As shown in (1), the opening edge 13 and the opening edge 23 are opposed to each other, and this portion is crimped and pressed to seal. Third Embodiment FIG. 5 is an assembly diagram of a cylindrical alkaline secondary battery according to the third embodiment.

As shown in the figure, the alkaline secondary battery 50 includes a spirally wound positive electrode plate and a spirally wound negative electrode plate in a space surrounded by a cylindrical outer can 60 and a sealing lid 70 for sealing the opening thereof. The plate is formed by filling a group of spiral electrode plates 90 in which plates are stacked via a separator and impregnated with an alkaline electrolyte. The outer can 60 is made of a metal plate 61 formed into a cylindrical shape, and its inner surface is covered with an alkali-resistant resin layer 62. The materials of the metal plate 61 and the resin layer 62 are the same as those of the metal plate 11 and the resin layer 12 of the first embodiment.

The sealing lid 70 and the sealing lid 80 are formed of a nickel plate, and the sealing lid 70 is provided with a positive electrode terminal 71 in which a safety valve is provided. As shown in FIG. 6, one opening edge 63 of the outer can 60 and the outer edge 72 of the sealing lid 70 are provided.
Is crimped, and the other opening edge 64 of the outer can 60
The outer edge 82 of the sealing lid 80 is also crimped and pressed.

The positive electrode plate, the negative electrode plate, and the alkaline electrolyte constituting the electrode plate group 30 are the same as in the first embodiment. A current collecting tab 9 made of a nickel thin plate is provided on the upper part of the positive electrode plate.
5. A current collecting tab 96 is attached to the lower part of the negative electrode plate. The front end of the current collecting tab 95 is connected to the sealing lid 70, and the front end of the current collecting tab 96 is connected to the sealing lid 80.

[Method of Manufacturing Battery] The method of manufacturing the alkaline secondary battery 50 will be described. Production of Exterior Can 60 The exterior can 60 is prepared by laminating the resin layer 12 on a metal plate 61 to produce a pre-coated plate, which is formed into a predetermined shape (circular shape).
It is manufactured by punching, further performing transfer drawing, molding into a bottomed cylindrical shape, and cutting the bottom portion.

Preparation of Sealing Cover 70 The sealing cover 70 and the sealing cover 80 are manufactured by stamping and molding a nickel plate, and attaching the positive electrode terminal 71 in which a safety valve is provided. Preparation of spiral electrode plate group 90 A current collecting tab 95 is attached to a belt-like positive electrode plate, and a current collecting tab 96 is attached to a belt-like negative electrode plate. Then, the positive electrode plate and the negative electrode plate are
The spirally-wound electrode group 90 is produced by laminating and winding via a separator.

Battery Assembly The spirally wound electrode plate group 90 is housed in the outer can 60. Seam grooves 63a, 64a are formed in the opening edges 63, 64 of the outer can 60. Attach the tips of the current collecting tabs 95, 96 to the sealing lids 70, 80.
Spot welding. The sealing lid 80 is attached to the opening edge 64 of the outer can 60 and crimped.

The spiral electrode plate group 90 is filled with an alkaline electrolyte.
Impregnated. A sealing lid 70 is provided on the opening edge 63 of the outer can 60.
And crimped. As described above, since the outer can is formed of the aluminum alloy plate and the resin layer, the alkali secondary battery 50 has a larger weight than an alkaline secondary battery using an outer can made of, for example, a nickel-plated steel sheet. It can be reduced and the processing is easy.

[0041]

[Example 1] Based on Embodiment 2 described above,
A 100 Ah alkaline secondary battery was produced. Outer can 10
The sealing lid 20 has a thickness of 0.1 mm as the metal plates 11 and 21.
Using a 5 mm aluminum alloy plate (A5052P),
A pre-coated plate was formed by laminating a 100 μm-thick polypropylene layer as the resin layers 12 and 22 thereon.

The electrode plate group 30 includes a positive electrode plate 31 and a negative electrode plate 32.
Was manufactured using a size of 100 mm × 120 mm, 17 positive electrode plates 31 and 18 negative electrode plates 32. [Comparative Example 1] Same as Example 1 above, except that the outer can 10
In addition, an alkaline secondary battery having a capacity of 100 Ah was manufactured using a polypropylene outer can and a sealing lid having substantially the same shape instead of the sealing lid 20.

[Experiment 1] With respect to the alkaline secondary batteries of Example 1 and Comparative Example 1, the internal breaking pressure and the temperature at the end of charging were measured. The internal pressure of the battery was measured by sandwiching the battery with an aluminum end plate so that the battery would not expand, removing the safety valve, sending compressed air into the battery, and pressurizing the battery.

The temperature at the end of charging was measured by placing the battery in a thermostat at 25 ° C., charging the battery at a constant current of 0.1 C for 11 hours, measuring the surface temperature of the battery, and setting the temperature at the end of charging. Table 1 shows the results of this experiment.

[0045]

[Table 1]

It can be seen from Table 1 that in Example 1, the internal breakdown pressure was tripled and the temperature at the end of charging was considerably lower than in Comparative Example 1. [Experiment 2] In the alkaline secondary battery of Example 1, the thickness of the resin layers 12 and 22 in the precoated plate was set to 5 μm to 2 μm.
It was prepared in a range of 50 μm. Resin layer thickness is 5μ
In the case of m, cracks occurred in the resin layer during the production of the outer can and the sealing lid.

Experiment 1 was conducted for each of the fabricated batteries.
In the same manner as in the above, the internal breaking pressure and the temperature at the end of charging were measured. Table 2 shows the results of this experiment.

[0048]

[Table 2]

As can be seen from Table 2, the breaking internal pressures are all the same, but are 25 times smaller than when the thickness of the resin layer is 200 μm or less.
In the case of 0 μm, it can be seen that the temperature at the end of charging is high.
This shows that the thickness of the resin layer is suitably from 10 μm to 200 μm. [Experiment 3] In the alkaline secondary battery of Example 1, the thickness of the metal plates 11 and 21 in the precoated plate was set to 0.2 mm.
It was produced by changing the range of up to 2.5 mm.

For each of the fabricated batteries, the breakdown internal pressure and the temperature at the end of charging were measured in the same manner as in Experiment 1. Table 3 shows the results of this experiment.

[0051]

[Table 3]

From Table 3, it can be seen that the temperatures at the end of charging are all the same, but the thicker the metal plate, the higher the breakdown internal pressure. [Embodiment 2] Based on Embodiment 3 described above, the capacitance 630
An AAA size alkaline secondary battery of mAh was produced.

The outer can 60 is manufactured by molding a pre-coated plate in which a 0.2 mm thick aluminum alloy plate (A5052P) is laminated as the metal plate 61 and a 100 μm thick polypropylene layer is laminated as the resin layer 62 on the aluminum alloy plate. did. [Comparative Example 2] Same as Example 2 above, except that the outer can 60
In place of the above, an AAA-size alkaline secondary battery with a capacity of 630 mAh was manufactured using an exterior can in which an iron plate having substantially the same shape and plated with nickel was used.

[Experiment 4] With respect to the alkaline secondary batteries of Example 2 and Comparative Example 2, the energy density and the temperature at the end of charging were measured. The energy density was calculated from the capacity of the battery and the weight of the battery. For the measurement of the temperature at the end of charging, the battery was placed in a thermostat at 25 ° C., charged at a constant current of 0.1 C for 16 hours, and the surface temperature of the battery was measured. Table 4 shows the results of this experiment.

[0055]

[Table 4]

From the results shown in Table 4, it can be seen that in Example 2, the temperature at the end of charging is the same as in Comparative Example 2, but the energy density is improved by about 20%. (Regarding Modifications) In the prismatic alkaline secondary batteries of Embodiments 1 and 2, an example in which the outer can 10 and the sealing lid 20 are formed in a flange shape has been described. Even in this case, as in Embodiment 3,
It is possible to mold the sealing lid 20 so as to fit into the opening of the outer can 10 and seal it by crimping. On the other hand, even with a cylindrical alkaline secondary battery, the outer can and the sealing lid are formed into a flange shape. It is possible to

Further, in the above embodiment, the method of joining the outer can and the sealing lid by welding or crimping has been described, but it is also possible to join by laser welding. Further, in the above-described embodiment, an example in which an aluminum alloy is used as the metal material of the outer can has been described. However, a case where a steel plate or the like is used can be similarly implemented.

[0058]

According to the alkaline secondary battery of the present invention, the outer can is made of a metal such as aluminum or an aluminum alloy, and the inner surface thereof is covered with an alkali-resistant resin layer. It is lightweight and has excellent heat dissipation as compared with a conventional resin outer can, and also has the effect that the pressure resistance can be greatly improved. .

Here, the lid for closing the opening of the outer can may also be made of metal and its inner surface may be covered with an alkali-resistant resin layer. In this case, the edge of the outer can and the opposing edge thereof The edges of the lid may be folded back outward, and the resin layers at the edges may be welded to each other for joining. Then, such an alkaline secondary battery, using a precoated plate in which an alkali-resistant resin layer is formed on one side of a metal plate, molding the outer layer into a cylindrical shape such that the resin layer is on the inside, and It can be easily manufactured by a manufacturing method including a step of storing the electrode body in the prepared outer can and a step of closing the opening of the outer can with a lid.

Here, the lid can also be manufactured by molding a precoated plate in which one surface of a metal plate is coated with an alkali-resistant resin layer. In this case, the outer can and the lid are separated from each other by the resin layers. Can be joined by heat welding.

[Brief description of the drawings]

FIG. 1 is a perspective view of a prismatic alkaline secondary battery according to a first embodiment;

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an assembly view of the alkaline secondary battery of FIG. 1;

FIG. 4 is a cross-sectional view showing a sealing method of the alkaline secondary battery according to the second embodiment.

FIG. 5 is an assembly diagram of the cylindrical alkaline secondary battery according to the third embodiment;

FIG. 6 is a cross-sectional view illustrating a sealing method of the alkaline secondary battery according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Alkaline secondary battery 10 Outer can 11 Metal plate 12 Resin layer 13 Opening edge 20 Sealing lid 21 Metal plate 22 Resin layer 23 Opening edge 30 Electrode group 41,42 Polar column 50 Alkaline rechargeable battery 60 Outer can 61 Metal Plate 62 Resin layer 63, 64 Opening edge 70, 80 Sealing lid 90 Spiral electrode plate group

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[Procedure amendment]

[Submission date] May 22, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

To solve such a problem, Japanese Patent Application Laid-Open No. 7-22 / 1995
No. 003 proposes a battery in which a plurality of cells are housed in a storage container having a monoblock structure having a partition plate, wherein the container body and the partition plate are formed of aluminum and coated with an alkali-resistant resin. In the case of this battery, although the cooling effect is improved to some extent due to the improvement in heat conductivity, it is considered that the problem that the temperature is likely to increase in the central portion during charging is likely to remain to some extent because heat is not easily released from the central portion due to the structure.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0058

[Correction method] Change

[Correction contents]

[0058]

According to the alkaline secondary battery of the present invention, the outer can is made of a metal such as aluminum or an aluminum alloy, and the inner surface thereof is covered with an alkali-resistant resin layer. It is lightweight and has excellent heat dissipation as compared with a conventional resin outer can, and also has the effect that the pressure resistance can be greatly improved.

Claims (10)

[Claims] An electrode body formed by laminating a positive electrode and a negative electrode with a separator interposed therebetween is impregnated with an alkaline electrolyte and housed in a cylindrical outer can. The opening of the outer can is sealed with a lid. In the above alkaline secondary battery, the outer can is made of metal and the inner surface thereof is covered with an alkali-resistant resin layer. 2. The alkaline secondary battery according to claim 1, wherein the lid is made of metal and has an inner surface covered with an alkali-resistant resin layer. 3. An edge portion of the outer can and an edge portion of the lid body facing the edge portion are both folded outward, and are joined by welding the resin layers at the edge portion. The alkaline secondary battery according to claim 2, wherein: 4. The alkaline secondary battery according to claim 1, wherein the resin layer has a structure in which a plurality of types of resins are laminated. 5. The resin layer is made of polypropylene, polyethylene, polystyrene, a copolymer of modified polyphenylene ether and polystyrene, AB
S resin, acrylonitrile styrene resin, polyamide,
The alkaline secondary battery according to any one of claims 1 to 4, wherein the alkaline secondary battery is formed of a resin selected from the group consisting of a vinyl chloride resin, a vinylidene chloride resin, a methacrylic resin, and a mixture thereof. 6. The method according to claim 1, wherein said resin layer has a thickness of 10 μm to 200 μm.
The alkaline secondary battery according to any one of claims 1 to 5. 7. The alkaline secondary battery according to claim 1, wherein the metal is aluminum or an aluminum alloy. 8. An outer can forming step of forming an outer can by molding a precoated plate in which one side of a metal plate is coated with an alkali-resistant resin layer into a tubular shape such that the resin layer is on the inner side. An alkali, comprising: an electrode body housing step of housing an electrode body in which a positive electrode and a negative electrode are laminated via a separator in an outer can; and a sealing step of sealing an opening of the outer can with a lid. A method for manufacturing a secondary battery. 9. The method according to claim 1, further comprising the step of forming a precoated plate in which one surface of a metal plate is coated with an alkali-resistant resin layer, and forming a lid used in the closing step. Item 10. The method for producing an alkaline secondary battery according to Item 8. 10. The manufacturing of the alkaline secondary battery according to claim 9, wherein the sealing step includes a sub-step of joining the outer can and the lid by welding their resin layers. Method.