JP2014009401A - Surface treated steel sheet for battery vessel, method for producing the same, battery vessel and battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface treated steel sheet for a battery vessel, when being used as a battery vessel, capable of making battery properties satisfactory and also achieving excellent long term storage stability.SOLUTION: The surface treated steel sheet for a battery vessel has an iron-nickel diffusion layer formed by performing thermal diffusion treatment after the formation of a nickel plating layer at a thickness of 1.5 μm or higher. Provided that the average crystal grain size of the steel sheet after the thermal diffusion treatment is defined as X[μm] and the thickness of the nickel plating layer before the thermal diffusion treatment is defined as Y[μm], the relation of the following inequality is satisfies: Y≥0.285X-0.05(1).

Description

  The present invention relates to a surface-treated steel sheet for battery containers and a method for producing the same, a battery container using the surface-treated steel sheet for battery containers, and a battery using the battery container.

  In recent years, portable devices such as audio devices and mobile phones have been used in many fields, and alkaline batteries as primary batteries, nickel-hydrogen batteries as secondary batteries, lithium ion batteries, and the like are frequently used as operating power sources. These batteries are required to have high performance such as high output and long life, and battery containers filled with power generation elements composed of a positive electrode active material, a negative electrode active material, and the like are also important battery components. There is a need for improved performance.

  As such a battery container material, for example, in Patent Document 1, in a battery container material formed by forming nickel plating or nickel alloy plating on the surface of a steel sheet, a steel sheet having a crystal grain size in the range of 10 to 12 is used. The technique used is disclosed. However, in Patent Document 1, although the corrosion resistance is improved by setting the crystal grain size of the steel sheet in the range of 10 to 12, a battery obtained using the battery container material disclosed in Patent Document 1 is used. When stored for a long time (for example, 10 years or more), there is a problem that liquid leakage occurs, and therefore, long-term storage stability is poor.

JP-A-9-306438

  An object of the present invention is to provide a surface-treated steel sheet for a battery container that can have good battery characteristics and can realize excellent long-term storage stability when used as a battery container. It is. Another object of the present invention is to provide a battery container and a battery obtained by using such a surface-treated steel sheet for battery containers.

  As a result of intensive studies to achieve the above object, the present inventors have formed a nickel plating layer on a steel plate and thermally diffused it to form an iron-nickel diffusion layer. In the surface-treated steel sheet, it has been found that the above object can be achieved by having a predetermined relationship between the thickness of the nickel plating layer before the heat diffusion treatment and the average crystal grain size of the steel sheet after the heat diffusion treatment. It came to complete.

That is, according to the present invention, a surface-treated steel sheet for a battery container having an iron-nickel diffusion layer formed by forming a nickel plating layer with a thickness of 1.5 μm or more on a steel plate and then performing a thermal diffusion treatment. When the average crystal grain size of the steel sheet after the heat diffusion treatment is X [μm] and the thickness of the nickel plating layer before the heat diffusion treatment is Y [μm], the following formula (1) is satisfied. A surface-treated steel sheet for battery containers is provided.
Y ≧ 0.285X−0.05 (1)

  The surface-treated steel sheet for battery containers of the present invention preferably includes a nickel layer on the iron-nickel diffusion layer. The nickel layer is a nickel layer in which iron is not substantially diffused after the thermal diffusion treatment.

According to this invention, the battery container formed by shape | molding one of the said surface-treated steel sheets for battery containers is provided.
Moreover, according to this invention, the battery which uses the said battery container is provided.

Furthermore, according to the present invention, the step of forming a nickel plating layer with a thickness of 1.5 μm or more on a steel plate, and the steel plate provided with the nickel plating layer are subjected to a thermal diffusion treatment, thereby providing an iron-nickel diffusion layer. The average crystal grain size of the steel sheet after the thermal diffusion treatment is X [μm], and the thickness of the nickel plating layer before the thermal diffusion treatment is Y [μm]. The nickel plating layer is formed and the thermal diffusion treatment is performed so as to satisfy the above).
Y ≧ 0.285X−0.05 (1)

  According to the present invention, in the surface-treated steel sheet for battery containers having an iron-nickel diffusion layer, the thickness of the nickel plating layer before the thermal diffusion process and the average crystal grain size of the steel sheet after the thermal diffusion process are set as described above. By providing a relationship, it is possible to provide a surface-treated steel sheet for a battery container that can have good battery characteristics when used as a battery container and can realize excellent long-term storage stability. Can do. Moreover, according to this invention, the battery container and battery obtained using such a surface-treated steel sheet for battery containers can be provided.

FIG. 1 is a diagram for explaining a method of measuring the average crystal grain size of a steel plate. FIG. 2 is a graph showing the relationship between the average crystal grain size of the steel sheet after the thermal diffusion treatment and the thickness of the nickel plating layer before the thermal diffusion treatment in the examples of the present invention.

Hereinafter, the surface-treated steel sheet for battery containers according to the present invention will be described.
The surface-treated steel sheet for battery containers of the present invention has an iron-nickel diffusion layer formed by performing a thermal diffusion process after forming a nickel plating layer with a thickness of 1.5 μm or more on the steel sheet, When the average crystal grain size of the steel sheet after the diffusion treatment is X [μm] and the thickness of the nickel plating layer before the thermal diffusion treatment is Y [μm], the following formula (1) is satisfied.
Y ≧ 0.285X−0.05 (1)

  As a steel sheet as a base material for the surface-treated steel sheet for battery containers of the present invention, any steel sheet may be used as long as it is excellent in drawing workability, drawing ironing workability, and workability by drawing and bending back work (DTR). Although not particularly limited, for example, low carbon aluminum killed steel (carbon content of 0.01 to 0.15 wt%), ultra low carbon steel having a carbon content of 0.003 wt% or less, or ultra low carbon steel and Ti or A non-aging ultra-low carbon steel made by adding Nb or the like can be used.

  In the present invention, these steel hot-rolled plates are pickled to remove the surface scale (oxide film), then cold-rolled, then electrolytically washed with rolling oil, and then annealed and temper-rolled. A thing is used as a substrate. In this case, the annealing may be either continuous annealing or box annealing, and is not particularly limited.

<Iron-nickel diffusion layer>
The surface-treated steel sheet for battery containers of the present invention includes an iron-nickel diffusion layer on the steel sheet. In the present invention, the iron-nickel diffusion layer is formed on the steel plate by forming a nickel plating layer with a thickness of 1.5 μm or more, and then performing a thermal diffusion treatment on the steel plate on which the nickel plating layer is formed. Is a layer formed by thermally diffusing iron constituting the nickel plating and nickel constituting the nickel plating layer.

  In the present invention, by forming such an iron-nickel diffusion layer formed by thermal diffusion, when the surface-treated steel sheet for battery containers of the present invention is used as a battery container, the electrolyte solution constituting the battery, etc. In addition, it is possible to prevent the steel plates from coming into direct contact with each other, thereby making it possible to improve battery characteristics.

The nickel plating layer for forming the iron-nickel diffusion layer can be formed on the steel plate by using, for example, a nickel plating bath. As the nickel plating bath, a plating bath usually used in nickel plating, that is, a watt bath, a sulfamic acid bath, a borofluoride bath, a chloride bath, or the like can be used. For example, a nickel plating layer having a bath composition of 200 to 350 g / L of nickel sulfate, 20 to 60 g / L of nickel chloride, and 10 to 50 g / L of boric acid is used as a watt bath, and pH is 3 to 4.8 (preferably pH 4). To 4.6) and a bath temperature of 50 to 70 ° C., and a current density of 10 to 40 A / dm ² (preferably 20 to 30 A / dm ² ).

The thickness of the nickel plating layer is 1.5 μm or more, preferably 1.6 μm or more, more preferably 2.0 μm or more. If the thickness of the nickel plating layer is too thin, the corrosion resistance during long-term storage is reduced, and when used as a battery container, there is a risk of leakage when stored for a long time. In addition, although the upper limit of the thickness of a nickel plating layer is not specifically limited, Usually, it is 4.0 micrometers or less, Preferably it is 3.0 micrometers or less. As the nickel plating layer, thickness may be in the range, the amount of nickel deposition is preferably at 13.35 g / ^{m 2} or more, more preferably 14.24 g / ^{m 2} or more, more preferably 17.8 g / m ² or more.

  And in this invention, after forming a nickel plating layer on a steel plate on the above conditions, about the steel plate which formed the nickel plating layer, an iron-nickel diffusion layer is formed by performing a thermal diffusion process. To do.

  The thermal diffusion treatment may be performed by either the continuous annealing method or the box-type annealing method. However, from the viewpoint of controlling the average crystal grain size X of the steel plate after the thermal diffusion treatment to be within a predetermined range, which will be described later, continuous. An annealing method is preferred. The thermal diffusion treatment conditions may be appropriately selected according to the thickness of the nickel plating layer and the amount of adhesion. For example, in the case of continuous annealing, the heat treatment temperature: 680 to 800 ° C., the heat treatment time: 40 to 85 seconds are preferable. In the case of box-type annealing, heat treatment temperature: 450 to 600 ° C., heat treatment time: 15 minutes to 8 hours, heat treatment atmosphere: non-oxidizing atmosphere or reducing protective gas An atmosphere is preferable. When the heat treatment atmosphere is a reducing protective gas atmosphere, a protective gas composed of 75% hydrogen-25% nitrogen generated by an ammonia crack method called hydrogen-enriched annealing with good heat transfer is used as the protective gas. It is preferable to use it.

  In the present invention, an iron-nickel diffusion layer can be formed between the steel plate and the nickel plating layer by performing the thermal diffusion treatment described above, and as a result, the nickel plating layer is completely heated. When diffused, the surface-treated steel sheet for battery containers of the present invention can be configured to have only an iron-nickel diffusion layer on the steel sheet (Fe-Ni / Fe). Alternatively, when performing the thermal diffusion process described above, iron is not substantially diffused on the surface side of the nickel plating layer (the side opposite to the side in contact with the steel plate) depending on the thickness of the nickel plating layer or heat treatment conditions. A nickel layer may remain. In this case, the surface-treated steel sheet for battery containers according to the present invention has a structure (Ni / Fe) having an iron-nickel diffusion layer and a nickel layer in order from the bottom on the steel sheet. -Ni / Fe).

<Average grain size of steel sheet after thermal diffusion treatment>
The surface-treated steel sheet for battery containers of the present invention has the above-described iron-nickel diffusion layer on the steel sheet, and the average crystal grain size of the steel sheet after the thermal diffusion treatment forms the iron-nickel diffusion layer. It has a specific relationship with the formation thickness of the nickel plating layer (that is, the thickness before the thermal diffusion treatment). Specifically, when the average crystal grain size of the steel sheet after the thermal diffusion treatment is X [μm] and the thickness of the nickel plating layer before the thermal diffusion treatment is Y [μm], the relationship of the following formula (1) It satisfies.
Y ≧ 0.285X−0.05 (1)

  In the present invention, the surface treatment for a battery container of the present invention is such that the average crystal grain size X of the steel plate after the thermal diffusion treatment and the thickness Y of the nickel plating layer before the thermal diffusion treatment satisfy the above relationship. When steel plate is used as a battery container, it is possible to effectively prevent the occurrence of liquid leakage during long-term storage while achieving good battery characteristics, thereby realizing excellent long-term storage stability It is something that can be done. On the other hand, when the average crystal grain size X of the steel sheet after the thermal diffusion treatment is too large in relation to the thickness Y of the nickel plating layer before the thermal diffusion treatment (that is, X is too large, Y <0.285X− In the case of 0.05), when the surface-treated steel sheet for the battery container is used to form the battery container shape, rough skin occurs, and the steel sheet as the base metal is exposed. It will be inferior to long-term storage stability.

  In the present invention, the average crystal grain size X of the steel sheet after the thermal diffusion treatment and the thickness Y of the nickel plating layer before the thermal diffusion treatment satisfy the relationship of the above formula (1). Although not particularly limited, for example, various conditions such as a heat diffusion treatment condition, that is, a heat treatment temperature and a heat treatment time, when performing the heat diffusion treatment, depending on the thickness of the nickel plating layer for forming the iron-nickel diffusion layer Adjustment method and the like. For example, the higher the heat treatment temperature, the easier it is for the crystal grains constituting the steel sheet to thermally grow, so the average crystal grain size X tends to increase. On the other hand, the lower the heat treatment temperature, the more the thermal growth of the crystal grains constituting the steel sheet is suppressed, and thus the average crystal grain size X tends to be reduced. Similarly, the longer the heat treatment time, the easier it is for the crystal grains constituting the steel sheet to thermally grow, so the average crystal grain size X tends to increase. On the other hand, the shorter the heat treatment time, the more the thermal growth of the crystal grains constituting the steel plate is suppressed, and the average crystal grain size X tends to be smaller.

  Therefore, in the present invention, for example, by considering the relationship between the heat treatment temperature and heat treatment time and the average crystal grain size X, and adjusting the heat treatment temperature and heat treatment time, the average of the steel sheets after the thermal diffusion treatment The size of the crystal grain size X can be controlled. In this case, it is preferable to perform the thermal diffusion treatment by a continuous annealing method from the viewpoint that the average crystal grain size X of the steel sheet after the thermal diffusion treatment can be controlled relatively easily. In addition, by controlling the thermal diffusion treatment conditions in this way, when controlling the average crystal grain size X of the steel plate after the thermal diffusion treatment, after considering the grain size of the steel plate before the thermal diffusion treatment It is desirable to adjust the thermal diffusion treatment conditions. In addition, as a method for satisfying the relationship of the above formula (1), the average crystal grain size X of the steel sheet after the thermal diffusion treatment and the thickness Y of the nickel plating layer before the thermal diffusion treatment are as described above. The method is not limited to the method for adjusting the thermal diffusion treatment conditions, and various methods can be adopted.

  In the present invention, the method for measuring the average crystal grain size X of the steel sheet after the heat diffusion treatment is not particularly limited, but the cross section of the steel plate after the heat diffusion treatment is obtained by taking a cross-sectional photograph with a microscope. It can be measured according to JIS G0551 (Appendix 2) using the cross-sectional photograph.

  Specifically, first, a cross-sectional photograph is taken at a magnification of 200 times for the cross section of the steel sheet after the thermal diffusion treatment. Here, FIG. 1 shows an example of a cross-sectional photograph of the steel sheet after the thermal diffusion treatment. At this time, photographs are also taken for a scale with a scale (minimum scale: 0.01 mm) at the same magnification of 200 times. Then, as shown in FIG. 1, three straight lines each having a length of 0.1 mm are arbitrarily drawn in the rolling direction and the vertical direction of the obtained cross-sectional photograph using the scale photograph. FIG. 1 shows an example in which straight lines L1 to L6 having a length of 0.1 mm are drawn. And according to the method described in JIS G0551, the number of the crystal grains located on each straight line is counted, and the L1-L3 and L4-L6 crystal grain sizes are calculated. And the average crystal grain size X of the steel plate after a thermal diffusion process is computable by converting the obtained crystal grain size into a crystal grain size.

In the present invention, the average crystal grain size X of the steel sheet after the thermal diffusion treatment and the thickness Y of the nickel plating layer before the thermal diffusion treatment may satisfy the relationship of the above formula (1). It is more preferable that the relationship of the following formulas (2) and (3) is satisfied from the viewpoint that the storage stability can be further improved. In particular, by satisfying the relationship of the following formulas (2) and (3), when the surface-treated steel sheet for battery containers of the present invention is used as a battery container and stored for a long period of time, in addition to liquid leakage, gas Can also be suppressed. That is, by satisfying the relationship of the following formulas (2) and (3), it is possible to improve the long-term storage stability.
Y ≧ 2 (2)
Y ≧ 0.625X-2.375 (3)

<Battery container>
The battery container of the present invention is obtained using the above-described surface-treated steel sheet for battery containers of the present invention. Specifically, the battery container of the present invention can be obtained by forming the above-described surface-treated steel sheet for battery containers of the present invention into a battery container shape by drawing, ironing, DI or DTR molding. In this case, when the surface-treated steel sheet for battery containers of the present invention has a structure having only an iron-nickel diffusion layer on the steel sheet, the iron-nickel diffusion layer is on the inner surface side of the container. Mold. Alternatively, when the surface-treated steel sheet for battery containers according to the present invention is configured to have an iron-nickel diffusion layer and a nickel layer in order from the bottom on the steel sheet, the nickel layer is on the inner surface side of the container. Mold.

  Since the battery container of the present invention is formed by using the above-described surface-treated steel sheet for battery containers of the present invention, the battery characteristics are good and long-term storage stability (for example, over a long period of 10 years or more). It has excellent stability when stored. Therefore, it can be suitably used as a battery container such as a battery using an alkaline electrolyte such as an alkaline battery or a nickel metal hydride battery, or a lithium ion battery.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

Example 1
Preparation of surface-treated steel sheet A steel sheet obtained by annealing a cold rolled sheet (thickness: 0.25 mm) of low-carbon aluminum killed steel having the chemical composition shown below was prepared as a substrate.
C: 0.045 wt%, Mn: 0.23% wt, Si: 0.02 wt%, P: 0.012 wt%, S: 0.009 wt%, Al: 0.063 wt%, balance: Fe and inevitable impurities

And about the prepared steel plate, after performing alkaline electrolytic degreasing and pickling of sulfuric acid immersion, nickel plating was performed on the following conditions and the nickel plating layer with a thickness of 2.16 micrometers was formed.
Bath composition: nickel sulfate 300 g / L, nickel chloride 45 g / L, boric acid 30 g / L, pit suppressor (sodium laurate) 0.4 ml / L
pH: 3 to 4.8
Bath temperature: 60 ° C
Current density: 25 A / dm ²

  Subsequently, about the steel plate in which the nickel plating layer was formed, the iron-nickel alloy layer was formed by performing a thermal diffusion process by continuous annealing under conditions of a temperature of 720 ° C. and 60 seconds, and a surface-treated steel plate was obtained. .

Production of Alkaline Manganese Battery And, using the surface-treated steel sheet thus obtained, the outer diameter is 13.8 mm and the height is 49.49 by drawing so that the iron-nickel alloy layer is on the battery container inner surface side. A battery container was fabricated by molding into a 3 mm cylindrical LR6 type battery (AA battery) container.

  Next, using the obtained battery container, an alkaline manganese battery was produced as follows. That is, manganese dioxide and graphite were collected at a ratio of 10: 1, and potassium hydroxide (10 mol) was added and mixed to prepare a positive electrode mixture. Next, this positive electrode mixture was pressurized in a mold to form a donut-shaped positive electrode mixture pellet having a predetermined size, and was press-inserted into the battery container obtained above. Next, a separator made of vinylon woven cloth is inserted along the inner circumference of the positive electrode mixture pellet press-inserted into the battery container, and the negative electrode gel made of potassium hydroxide saturated with zinc particles and zinc oxide is put into the battery container. Filled in. Then, after attaching an insulating gasket to the negative electrode plate and inserting it into the battery case, the negative electrode plate spot-welded with the negative electrode current collector rod was attached to the battery case and caulked to produce an alkaline manganese battery.

  And the following evaluation was performed about the surface treatment steel plate and alkali manganese battery which were obtained in this way.

Measurement of average crystal grain size of steel plate The average crystal grain size of the steel plate as the base metal was measured for the surface-treated steel plate obtained above. Specifically, a cross-sectional photograph was taken at a magnification of 200 times for the cross section of the obtained surface-treated steel sheet, and the obtained cross-sectional photograph was 0 in the rolling direction and the vertical direction as shown in FIG. . Three arbitrary straight lines each having a length of 1 mm were drawn. Next, according to the method described in JIS G0551, the number of crystal grains located on each straight line is counted, and from the number of crystal grains located on each straight line, using the calculation formula described in JIS G0551, The crystal grain size was calculated. And the average crystal grain size X of the steel plate after a thermal-diffusion process was computed by converting the obtained crystal grain size into a crystal grain size and calculating | requiring the average value of the obtained crystal grain size. The results are shown in Table 1.

High temperature storage test The alkali manganese battery obtained above was stored in a thermostat at a temperature of 90 ° C. for 50 days, and the alkali manganese battery after storage was evaluated for liquid leakage and gas generation. Went. Here, in this example, the high-temperature storage test was performed under conditions of a temperature of 90 ° C. and 50 days, but this condition is equivalent to the case of storage for 10 years or more at room temperature, and therefore, at room temperature. It can be determined that the same result can be obtained even when stored for more than 10 years. In this example, evaluation was performed according to the following criteria. The results are shown in Table 1.
○: No liquid leakage occurred, no gas was generated, or even a small amount of gas was generated.
Δ: Liquid leakage did not occur, and gas generation was relatively large.
X: Liquid leakage occurred and gas was generated frequently.
It should be noted that, under long-term storage conditions, it is necessary that at least liquid leakage does not occur. Therefore, even when gas was generated, it was determined that it was satisfactory when liquid leakage did not occur.

<< Examples 2 to 5 >>
A surface treatment was performed in the same manner as in Example 1 except that the nickel plating layer was formed in each thickness shown in Table 1 and the heating temperature and heating time in performing the thermal diffusion treatment were changed as shown in Table 1. Steel plates and alkaline manganese batteries were prepared and evaluated in the same manner. The results are shown in Table 1.

<< Comparative Examples 1-8 >>
A surface treatment was performed in the same manner as in Example 1 except that the nickel plating layer was formed in each thickness shown in Table 1 and the heating temperature and heating time in performing the thermal diffusion treatment were changed as shown in Table 1. Steel plates and alkaline manganese batteries were prepared and evaluated in the same manner. The results are shown in Table 1.

In Table 1 and FIG. 2, in Examples 1-5 and Comparative Examples 1-8, the average crystal grain size X of the steel plate after the thermal diffusion treatment, the thickness Y of the nickel plating layer before the thermal diffusion treatment, and the high temperature storage test The results are summarized. FIG. 2 is a graph plotting the average crystal grain size X of the steel plate after the thermal diffusion treatment and the thickness Y of the nickel plating layer before the thermal diffusion treatment in Examples 1 to 5 and Comparative Examples 1 to 8. Yes, each plot shows the results of a high temperature storage test. That is, for example, the result of Example 1 in which the result of the high temperature storage test was “◯” is shown by the plot of “◯” at the position of X = 6.801 and Y = 2.16 (Example 2). , 3). Similarly, the result of Example 4 in which the result of the high-temperature storage test was “Δ” is a plot of “Δ” at the position of X = 4.645 and Y = 1.56, and the result of the high-temperature storage test is “ The result of Comparative Example 1 that was “x” is indicated by the plot of “x” at the positions of X = 7.041 and Y = 1.64 (same for Example 5 and Comparative Examples 2 to 8). . Moreover, in FIG. 2, it has each shown about each line shown to each following formula.
Y = 1.5
Y = 0.285X-0.05 (formula corresponding to the above formula (1))
Y = 2 (formula corresponding to the above formula (2))
Y = 0.625X-2.375 (formula corresponding to the above formula (3))

As shown in Table 1 and FIG. 2, the nickel plating layer is formed with a thickness of 1.5 μm or more, and the average crystal grain size X of the steel plate after the thermal diffusion treatment and the thickness of the nickel plating layer before the thermal diffusion treatment In Examples 1 to 5, in which Y satisfies the relationship of the following formula (1), as a result of the high-temperature storage test, no liquid leakage occurs (that is, the evaluation is “◯” or “Δ”), The result was excellent in high-temperature storage characteristics.
Y ≧ 0.285X−0.05 (1)
In particular, among these Examples 1 to 5, Examples 1 to 3 satisfying the relations of the following formulas (2) and (3) have good gas generation in addition to liquid leakage in the high temperature storage test. It was prevented and the result was particularly excellent.
Y ≧ 2 (2)
Y ≧ 0.625X-2.375 (3)

  In contrast, Comparative Examples 1 to 8 in which the average crystal grain size X of the steel sheet after the thermal diffusion treatment and the thickness Y of the nickel plating layer before the thermal diffusion treatment do not satisfy the relationship of the above formula (1) are high temperatures. As a result of the storage test, liquid leakage occurred, resulting in poor high temperature storage characteristics.

Claims (5)

A surface-treated steel sheet for a battery container having an iron-nickel diffusion layer formed by performing a thermal diffusion treatment after forming a nickel plating layer with a thickness of 1.5 μm or more on the steel plate,
When the average crystal grain size of the steel sheet after the thermal diffusion treatment is X [μm] and the thickness of the nickel plating layer before the thermal diffusion treatment is Y [μm], the relationship of the following formula (1) is satisfied. A surface-treated steel sheet for battery containers.
Y ≧ 0.285X−0.05 (1)   The surface-treated steel sheet for battery containers according to claim 1, further comprising a nickel layer on the iron-nickel diffusion layer.   The battery container formed by shape | molding the surface-treated steel sheet for battery containers of Claim 1 or 2.   A battery comprising the battery container according to claim 3. Forming a nickel plating layer with a thickness of 1.5 μm or more on the steel sheet;
About the steel plate provided with the nickel plating layer, a method for producing a surface-treated steel sheet for battery containers comprising a step of forming an iron-nickel diffusion layer by performing a thermal diffusion treatment,
When the average crystal grain size of the steel sheet after the thermal diffusion treatment is X [μm] and the thickness of the nickel plating layer before the thermal diffusion treatment is Y [μm], so as to satisfy the relationship of the following formula (1), A method for producing a surface-treated steel sheet for a battery container, wherein the nickel plating layer is formed and a thermal diffusion treatment is performed.
Y ≧ 0.285X−0.05 (1)

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