CN1121074C - Punched steel belt for power battery plate - Google Patents

Abstract

The invention provides a perforated steel strip for a power battery pole plate. The surface of the strip is punched and perforated, and burrs are arranged on the sides of all the perforated holes on the strip. The burrs are distributed on both sides of the perforated steel strip at intervals. The electroplating layer provided on the perforated steel strip not only includes nickel but also includes metal materials with better electrochemical properties than nickel. The perforated steel strip for the power battery pole plate provided by the present invention has greatly improved filling properties, adhesiveness and conductivity, and its electrochemical performance has also been improved, thereby prolonging the life of the battery using it as a positive or negative pole plate, and Its cost is far lower than that of existing products, which play a positive role in promoting the industrialization of power batteries.

Description

A perforated steel strip for a power battery plate

Technical field :

The invention belongs to the field of battery materials, and relates to a material for a battery pole plate, in particular to a perforated steel strip for a power battery pole plate.

Background technology :

Information, energy and materials are called the three pillars of the development of today's society. Energy storage materials integrate information, energy and materials, and their development is rapidly changing the development process of world civilization. Since the mid-1980s, the emergence of small chemical energy sources such as nickel-metal hydride batteries and lithium-ion batteries represented by energy storage materials has provided power for the rapid development of mobile communications and brought mankind into the communication age. Nowadays, chemical energy represented by energy storage materials is entering vehicles and becoming the power of automobiles and motorcycles. The emergence of this kind of power battery can not only properly solve the two obstacles that restrict the development of human civilization, namely environmental pollution and energy crisis. , and thus can change the world's energy supply structure.

The performance of the power battery depends on the performance of the energy storage material, and the most important energy storage material in the chemical battery is the positive electrode material and the negative electrode material. As the positive and negative plates, their performance has a major impact on the positive and negative plates formed by them, as well as the charging and discharging performance, price and cost of the power battery formed.

Perforated nickel-plated steel strip is rapidly replacing foamed nickel and becoming the preferred plate material for power batteries due to its outstanding advantages such as low cost and high current charge and discharge resistance. The perforated steel strip has two important functions in the battery manufacturing process: the first function is to be used as a carrier for the negative or positive electrode material of the battery. Its requirement is that the perforated steel strip should be filled with the active material as much as possible, and the active material on the perforated steel belt should have stronger bonding performance. The Chinese patent number is ZL98241828.0, and the utility model patent named "Perforated Steel Strip for Battery Plate" discloses a perforated steel strip, which has a positive contribution to the increase of the filling amount of the active material on the perforated steel strip. Its specific perforation arrangement and perforation shape greatly increase the porosity of the steel strip. However, its exploration of the bonding performance of perforated steel strips is relatively superficial. There is a general understanding in the battery plate material manufacturing industry: it is harmful to have burrs on the edge of the perforated hole on the perforated steel strip, but in the actual stamping process, there will always be some burrs on the edge of the hole more or less. Therefore, in In this industry, there is an industry standard that the perforation burr (also known as peaking) cannot exceed 0.01mm. In the above-mentioned patents, the inventors have realized that the presence of burrs is beneficial to the perforated steel strip in bonding active substances, but they still do not get rid of the usual concept, and the height of burrs is still controlled below 0.5mm. It has poor bonding performance to a larger amount of active material to be filled than a general battery when it is used as a power battery pole plate material.

The second function of the perforated steel strip in the battery manufacturing process is to serve as a current collector for the battery, which acts as a conductor during charging and discharging. The specific requirements are good electrical conductivity, small internal resistance, and corrosion resistance. The perforated steel strip provided by the above-mentioned patents is insufficient in terms of electrical conductivity and reduced internal resistance. When the steel strip is combined with the active material, the contact area between the steel strip and the active material is small due to fewer and lower burrs. resulting in poor conductivity. In addition, in the prior art including the aforementioned patents, the surface of the perforated steel strip is provided with a single-material electroplating layer, which is a nickel electroplating layer. Nickel is a good anti-corrosion material for electrode plates, but its electrochemical properties are not very good, especially for power batteries that require high electrochemical properties, such as high oxygen evolution overpotential or hydrogen evolution overpotential etc. are unsatisfactory.

Invention content :

The purpose of the present invention is to improve the defects of the prior art, to provide a perforated steel strip suitable for making high charge and discharge performance power battery plates, which has high charge and discharge performance, and is suitable for a large number of power batteries made with it. Active substances are highly filling and adhesive. A further object of the present invention is to provide a perforated steel strip with very low hydrogen evolution or oxygen evolution overpotential and excellent electrochemical properties.

The purpose of the present invention is achieved like this:

A perforated steel strip for a power battery pole plate, which is a strip structure, with perforations on the strip surface, and burrs are provided on the sides of all the perforated holes on the steel strip, and the burrs are spaced on both sides of the perforated steel strip On any side of the perforated steel strip, there is no burr on the side of one of the holes, and there are said burrs on the circumference around it on the same side at least in two directions adjacent holes; in

The burr formed by punching the edge of the perforation is composed of all materials in the punched hole, and the height of the burr is 0.5-5mm;

A composite electroplating layer is provided on the surface of the perforated steel strip, and the composite electroplating layer is: the electroplating layer at the bottom is a nickel electroplating layer, and the surface coating is: a cobalt or copper or silver or palladium electroplating layer; or zinc or tin or cadmium Plating.

The present invention also provides a perforated steel strip for a power battery plate, which is a strip structure, with perforations on the strip surface, and burrs are arranged on the sides of all the perforated holes on the steel strip, and the burrs are spaced apart on the perforated steel strip. Distributed on both sides of the strip; on any one side of the perforated steel strip, one of the holes has no burrs on this side, and on the same side on the circumference around it, there are at least two adjacent holes on the same side. The burr; where

The burr formed by punching the edge of the perforation is composed of all the materials in the punched hole, and the height of the burr is 0.5-5mm; an alloy electroplating layer is provided on the surface of the perforated steel strip, and the alloy electroplating layer Alloying elements other than nickel are cobalt or copper or silver or palladium, or a mixture of one, two or three of these; or zinc or tin or cadmium, or one, two or three of them mix.

The perforated steel strip for the power battery pole plate provided by the present invention is a strip structure, with punched holes on the strip surface, and burrs are arranged on the sides of all the perforated holes on the strip, and the burrs are spaced on both sides of the perforated steel strip upper distribution.

The interval distribution of the burrs on the two sides of the perforated steel strip can be as follows:

On any side of the perforated steel strip, there is no burr on the side of any hole in the middle (the burr is on the other side), and the circumference around it has at least some holes on the adjacent holes in two directions. glitches.

When the perforations on the perforated steel strip are arranged in a straight line (that is, the perforations in each row and column are aligned left and right, front and rear), the burrs of the two adjacent rows of holes are respectively arranged on the two sides of the perforated steel strip, that is, the burrs are alternately arranged on both sides. Staggered. At this time, if a hole without burrs on one side is arbitrarily selected, adjacent holes in both directions of the hole have burrs.

When the perforations are arranged in a straight line, the better arrangement of the burrs is: the burrs on adjacent perforations in the same column are arranged alternately on both sides of the steel strip, that is, in the same row of perforations, the burrs of two adjacent holes are respectively arranged on the steel strip. On the two sides of the steel belt, and in the same row of perforations, the burrs of two adjacent holes are also respectively arranged on the two sides of the steel belt.

There is also a perforation arrangement, that is, staggered arrangement: in any two rows of perforations, the position of one row of perforations is aligned with the position of the gap between the adjacent row of perforations, and the staggered perforations have burrs in the same row of perforations , the burrs of two adjacent holes are respectively arranged on the two sides of the steel strip, and in the same row of perforations, the burrs of two adjacent holes are also respectively arranged on the two sides of the steel strip.

In the above-mentioned two cases of straight row staggered burr distribution and staggered row staggered burr distribution, any perforation without burrs on one side will have burrs in the adjacent holes in four directions around the side hole.

The function of the burr is to improve the filling and adhesion of the pole plate to the active material on it in the production of the battery. A perforated steel strip without burrs or less burrs only accommodates active substances through the perforations on it, and if the porosity of the perforated steel strip (percentage of the perforated area per unit area of the steel strip) is too large, the resistance of the perforated steel strip will increase. The tensile strength will be reduced, which will reduce the mechanical properties of the perforated steel strip, so the porosity of the perforated steel strip generally does not exceed 60%. With the burrs on the edge of the perforation, it means that the burrs on the holes on the surface of the steel strip form a new space for containing active substances. Therefore, each hole on the perforated steel strip is equipped with burrs and burrs on both sides of the steel strip. The uniform and orderly distribution on the surface is very beneficial to greatly improving the filling capacity of the perforated steel strip for the active material. Simultaneously, the improvement of the adhesiveness of the active material attached to the steel strip by the burr is also very beneficial. By punching, the steel strip forms a hole, and the steel material on the hole-forming position breaks vertically to form a burr at the edge of the hole, and the burr The edge of the perforated steel plate is very rough, so it has strong adhesion to the active material attached to the steel strip. In addition, the high and many burrs on the perforated steel plate can increase the size of the positive plate and active material per unit area of the power battery. contact area, thereby improving charging performance. The burrs on the perforation are evenly distributed on both side surfaces of the steel strip, which can prevent the active material from falling off when it is used as a pole plate. But if it is not evenly distributed, it is also possible, but powder falling will occur where the burrs are sparsely distributed. In this case, the perforated burrs near the edge should be denser.

The height of the burr can be 0.5-5mm.

In order to maximize the filling, bonding and electrical conductivity of the perforated steel strip, it is the best solution not to drop the punched metal when the punched steel strip is perforated, but to completely convert it into burrs, that is, one of the The burr formed by stamping on the edge of the perforation is composed of all the material in the hole as the perforation. In this way, in addition to better filling, adhesiveness and conductivity, it can effectively improve the utilization rate of raw materials. During the processing of the steel strip, the burrs on both sides of the steel strip can be evenly distributed through two perforations, or can be punched once by setting punches on the upper and lower sides of the steel strip.

In order to make the perforated steel strip of the power battery pole plate provided by the present invention reduce the amount of hydrogen evolution when it is used as the negative electrode after the battery is made, and reduce the amount of oxygen evolution when it is used as the positive electrode, thereby reducing the internal resistance and self-discharge tendency of the battery, the perforated steel Such an electroplating layer is arranged on the strip: the electroplating layer includes elements whose electrochemical performance is higher than that of nickel. When the steel strip is used as a positive electrode plate, the electroplating layer can include metals with an oxygen evolution overpotential higher than that of nickel. , such as cobalt (Co), copper (Cu), silver (Ag), or palladium (Pd), etc., when the steel strip is used as a negative electrode plate, the electroplating layer can include metals with a hydrogen evolution overpotential higher than that of nickel, such as Zinc (Zn), tin (Sn) or cadmium (Gd).

Wherein a kind of scheme is: establish nickel-plated layer on the perforated steel strip, electroplating is provided with a metal plating layer of its electrochemical property better on the described nickel layer again, when this steel strip is used as the negative pole of battery, described The metal layer has a higher hydrogen evolution overpotential than nickel, such as zinc layer, tin layer or cadmium layer; when the steel strip is used as the positive electrode of the battery, the metal layer has a higher oxygen evolution overpotential than nickel Metal layer, such as cobalt layer, copper layer or palladium layer. The plating of one of the above metals on the nickel plating layer can effectively improve the electrochemical performance of the pole plate.

However, the cost of cobalt, copper, palladium or zinc, tin, and cadmium is higher than that of nickel, and the two-layer metal electroplating layer must be realized by electroplating twice during the processing process. In order to improve the electrochemical performance of the plate, the following A more economical, simple and effective solution is described: an alloy coating is provided on the perforated steel strip, and the alloy coating includes nickel, and additionally includes cobalt, copper, silver, palladium or zinc, tin, and cadmium. At least any one, thus forming an alloy plating layer. Since the electrochemical properties of other alloy elements added to the nickel electroplating layer are superior to those of nickel, the electrochemical properties of the formed alloy electroplating layer are also higher than those of the pure nickel coating. While improving the electrochemical performance of the electroplating layer, compared with the aforementioned composite coating scheme, the amount of materials with good performance but high price is greatly reduced, so the cost of the product is reduced. In addition, during the implementation of this scheme, The electroplating layer with high electrochemical performance can be obtained only through one electroplating process, which is more convenient and easy to operate.

In arranging the electroplating layer, in the two coating layers formed in the first scheme, the thickness of the nickel coating inside can be 0-10 μ m, and the more optimal choice is 3-5 μ m, and the thickness of the metal coating outside can be 0 -10μm, the more optimal choice is 3-5μm.

In the scheme of forming a multi-element alloy coating, the total amount of alloying elements other than nickel in the surface coating of the finished perforated steel strip can account for 8-60% of the total weight of the electroplating layer. If any one of the above alloying elements is added The amount of alloying elements other than nickel can account for 8-40% of the total weight of the electroplating layer. If any two of the above alloying elements are added, the nickel and the total amount of each element added in the surface coating of the finished perforated steel strip The weight ratio is: nickel: the total amount of alloying elements can be 4-5: 3-4; for example, add cobalt and copper in nickel, the weight ratio of nickel, cobalt, copper can be 4-5: 1.0: 2-3 .

In actual operation, in the production of composite electroplating layer, in order to speed up the electroplating speed, the ratio of nickel plating solution can be:

Nickel sulfamate (Ni(NH ₂ SO ₃ ) ₂ ) 200-500 g/L;

Nickel chloride (NiCl ₂ 6H ₂ O) 20-50 g/L;

Boric acid (H ₃ BO ₃ ) 25-45 g/l.

The pH value of this electroplating solution is controlled at 3-5, and the thickness of the nickel coating is controlled at 3-5 μm; the second layer of alloy elements is plated, and in order to speed up electroplating, the proportioning of the plating solution is:

Sulfamic acid M (Ni(NH ₂ SO ₃ ) ₂ ) 200-500 g/L;

Chloride M (NiCl ₂ 6H ₂ O) 20-50 g/L;

Boric acid (H ₃ BO ₃ ) 25-45 g/l.

M in the formula represents any one of the alloy elements listed above, the pH value of the electroplating solution is controlled at 3-5, and the thickness of the nickel coating is controlled at 3-5 μm.

In the second scheme, add a kind of alloying element, in the technique of implementing operation, add above-mentioned any one alloying element 1.25-6.1 gram in every liter of nickel electroplating solution, the composition of plating solution can be:

Sulfamic acid M (Ni(NH ₂ SO ₃ ) ₂ ) 500-600 g/L;

M chloride (NiCl ₂ 6H ₂ O) 10-20 g/L;

Boric acid (H ₃ BO ₃ ) 30-50 g/L;

Mn ⁺ 1.25-6.1 g/l.

Wherein M represents the alloy element added, ⁿ⁺ represents the valence of the alloy element, M ⁿ⁺ represents the salt of M element, the pH value of the electroplating solution is controlled at 3.8-4.5, and the temperature of the electroplating solution is controlled at 40-60°C.

Description of drawings :

The present invention will be further described below by means of the accompanying drawings and examples.

Fig. 1 is the structural representation of the perforated steel strip that represents straight arrangement perforation burr straight row;

Fig. 2 is a structural schematic view of a perforated steel strip showing a staggered arrangement of perforated burrs;

Fig. 3 is a schematic diagram showing the structure of a perforated steel strip with staggered arrangement of perforated burrs.

Specific implementation methods :

Example 1:

This embodiment provides a steel strip 1 with perforations. As shown in FIG. 1 , burrs 3 are provided on the perforations 2 , and the height of the burrs 3 is 3.5 mm. The perforations 2 on it are arranged in straight rows, and the burrs on it are arranged in staggered rows.

Fig. 2 and Fig. 3 respectively show the structures in which the perforated straight-line burrs are arranged in a straight line and the perforated staggered burrs are also staggered. Among the several structures shown in Fig. 1-Fig. 3, the structural steel strip shown in Fig. 3 has the best filling and bonding properties to the active material.

A composite electroplating layer is plated on the surface of the steel strip, the bottom layer is plated with 3 μm of nickel, and the upper layer is plated with 5 μm of cobalt.

The plating solution for nickel plating can be:

Nickel sulfamate 200 g/L;

Nickel chloride 20 g/L;

Boric acid 25 g/L;

The pH value of this electroplating solution is controlled at 3;

The plating solution for cobalt plating can be:

Cobalt sulfamate 200 g/L;

Cobalt chloride 20 g/L;

Boric acid 25 g/L

The pH value of this electroplating solution is controlled at 3.

The plating solution for nickel plating can also be:

Nickel sulfamate 500 g/L;

Nickel chloride 50 g/L;

Boric acid 45 g/L;

The pH value of this electroplating solution is controlled at 5;

The plating solution for cobalt plating can be:

Cobalt sulfamate 500 g/L;

Cobalt chloride 50 g/L;

Boric acid 45 g/L;

The pH value of this electroplating solution is controlled at 3.

The electroplating solution for nickel plating can also be:

Nickel sulfamate 350 g/L;

Nickel chloride 35 g/L;

Boric acid 30 g/L.

The pH value of this electroplating solution is controlled at 4;

The electroplating solution for cobalt plating is:

Cobalt sulfamate 350 g/L;

Cobalt chloride 35 g/L;

Boric acid 30 g/L

The pH value of this electroplating solution is controlled at 4.

Example 2:

This embodiment provides a perforated steel strip 1' in which the perforations 2' are staggered and the burrs 3' are also staggered as shown in Figure 3. The burrs on the perforations 2' are composed of all the materials in the holes as the perforations. No steel shavings fall during the hole forming process. A nickel-cobalt alloy coating is processed and plated on the above-mentioned steel strip.

When configuring the electroplating solution, first, determine a nickel-containing plating solution with basic components, and then add cobalt salts to the nickel-containing plating solution according to the required cobalt content in the coating.

Nickel-containing baths can be:

Nickel sulfamate (Ni(NH ₂ SO ₃ ) ₂ ) 500 g/l;

Nickel chloride (NiCl ₂ 6H ₂ O) 10 g/l;

Boric acid (H ₃ BO ₃ ) 30 g/l.

The pH value of the electroplating solution is controlled at 3.8, and the temperature of the electroplating solution is controlled at 40°C.

Nickel-containing baths can also be:

Nickel sulfamate (Ni(NH ₂ SO ₃ ) ₂ ) 600 g/l;

Nickel chloride (NiCl ₂ 6H ₂ O) 20 g/l;

Boric acid (H ₃ BO ₃ ) 50 g/l.

The pH value of the electroplating solution is controlled at 4.5, and the temperature of the electroplating solution is controlled at 60°C.

Nickel-containing plating solution can also be:

Nickel sulfamate (Ni(NH ₂ SO ₃ ) ₂ ) 550 g/l;

Nickel chloride (NiCl ₂ 6H ₂ O) 15 g/l;

Boric acid (H ₃ BO ₃ ) 40 g/l.

The pH value of the electroplating solution is controlled at 4.1, and the temperature of the electroplating solution is controlled at 50°C.

Add cobalt salts (such as cobalt chloride or cobalt sulfamate, etc.) to the above-mentioned nickel plating solution. The amount of cobalt salt added, the content of cobalt in the final coating and the current density of the corresponding steel strip products are shown in Table 1.

In the present embodiment, the cobalt content required in the coating is 8-12%. As can be seen from Table 1, adding cobalt sulfamate to ^the Co content in the above-mentioned nickel plating solution is 1.25 grams per liter. The coating is controlled at 4 μm.

Table 1 Co ²⁺ content (g/l) 1.25 1.5 1.75 3.5 4.25 6.1 Current density (A/dm ² ) 5 8 2 8 2 3 3 3 Cobalt content in coating (wt) 8% 10% 12% 9% 13% 20% 25% 31%

Example 3:

Replace Ni-Co alloy coating with Ni-Co-Cu alloy coating on the perforated steel strip 1 ' that embodiment 2 provides, the formula of the electroplating solution that adopts is:

Nickel sulfate (NiSO ₄ 7H ₂ O) 80-100g/l;

Cobalt sulfate (CoSO ₄ 5H ₂ O) 10-15g/l;

Copper sulfate (CuSO ₄ 5H ₂ O) 10-12g/l;

Ammonium citrate [(NH ₄ ) ₂ HC ₆ H ₅ O ₇ ] 1-2g/l;

Saccharin 0.5-1g/l. The pH of the electroplating solution is controlled at 3.8-4.5, and the temperature is controlled at room temperature. By electroplating, a 5 μm electroplated layer is formed on the steel strip. The weight ratio of Ni, Co and Cu in the coating is Ni:Co:Cu=4-5:1.0:2-3. The current density of the obtained product can be 0.5-20A/dm ² .

The perforated steel strip used to make the positive pole plate of the battery can be produced by the method of the above-mentioned embodiment, and the steel strip used to make the negative pole plate of the battery can also be produced by the same method, but the alloy elements used should be zinc, tin Or cadmium, the above parameters are also applicable, so no more examples will be given here.

Table 2 and Table 3 below show the values of the hydrogen evolution overpotential and oxygen evolution overpotential of the added alloy elements and the alloy electroplating layer formed.

Table 2 Oxygen evolution overpotential at 25°C Unit: Volt Current density A/M ² Ni co Cu Ag PD Co-Ni alloy (Co=10%) Co-Ni-Cu (10%-70%-20%) 10 0.353 0.371 0.442 0.58 0.711 0.365 0.412 100 0.519 0.542 0.580 0.729 0.809 0.530 0.573

Table 3 Hydrogen Evolution Overpotential at 25°C Unit: Volt Current density A/M ² Ni Zn sn Cd 100 0.563 0.716 0.856 0.981

The perforated steel strip for power battery pole plate provided by the present invention is provided with burrs on all the perforations, and the burrs are relatively high, so that the fillability and adhesion of the steel strip to the active material connected to it when manufacturing the battery are greatly improved, The filling amount of the active material in this steel belt is 10 times, even dozens of times that of the existing steel belt, and it does not drop powder during use. High burrs also increase the electrical conductivity of the strip. The process of making burrs is very simple, so the manufacturing cost is low. The present invention further improves the coating structure on the surface of the perforated steel strip, breaks through the prior art that only pays attention to the corrosion resistance of the steel strip, and ignores the defect of improving its electrochemical performance, and adds materials with better electrochemical performance , to improve the electrochemical performance of the steel strip in the battery, which is beneficial to prolong the life of the battery. The power battery is characterized by high power, generally more than 10Ah for a single cell, and requires fast charge and discharge during use, and must be charged and discharged at a high rate. Using this steel strip, due to its small resistance, good conductivity, and high strength, it can be used at high rates. (More than 20 times) There will be no heating during charging and discharging, and it will not affect the life and performance of the battery. Whether the power battery can be industrialized mainly depends on its cost, and reducing its manufacturing cost is a key factor in realizing the industrialization of the power battery. The price of the perforated steel strip provided by the present invention as a pole plate material is only 10% of that of the existing foamed nickel pole plate material. 1/10 of the existing perforated nickel-plated steel strip, which is 1/3 of the existing perforated nickel strip. The cost of the battery can be reduced by more than 5% by adopting the pole plate of the battery made of the steel strip.

Claims (7)

1, a kind of punched steel belt for power battery plate is banded structure, has perforation on the zone face, and limits, perforation hole all on the described steel band are provided with burr, and described burr compartment of terrain distributes on the two sides of described perforated steel ribbon; On any one side of described perforated steel ribbon, there is not burr on this side in one of them hole, on its circumference on every side described burr is being arranged on hole adjacent on the both direction at least on the same side; It is characterized in that:

The described burr that described perforated edge punching press forms is by constituting as all material in the hole of going out the hole, and the height of burr is 0.5～5mm;

Be provided with composite galvanized coating on described perforated steel ribbon surface, described composite galvanized coating is: the electrodeposited coating of bottom is the nickel electrodeposited coating, and overlay coating is: cobalt or copper or silver or palladium electrodeposited coating; Perhaps be zinc or tin or cadmium electrodeposited coating.

2, punched steel belt for power battery plate according to claim 1 is characterized in that: in described two electrodeposited coatings that are provided with, the nickel thickness of plating layer of the inside is 3-5 μ m, and the described electrodeposition of metals of outside is 3-5 μ m.

3, a kind of punched steel belt for power battery plate is banded structure, has perforation on the zone face, and limits, perforation hole all on the described steel band are provided with burr, and described burr compartment of terrain distributes on the two sides of described perforated steel ribbon; On any one side of described perforated steel ribbon, there is not burr on this side in one of them hole, on its circumference on every side described burr is being arranged on hole adjacent on the both direction at least on the same side; It is characterized in that:

The described burr that described perforated edge punching press forms is by constituting as all material in the hole of going out the hole, and the height of burr is 0.5～5mm; Be provided with alloy plated layer on described perforated steel ribbon surface, the alloying element of described alloy plated layer except nickel is cobalt or copper or silver or palladium, or a kind of, two or three mixing in them; Perhaps zinc or tin or cadmium, or a kind of, two or three mixing in them.

4, punched steel belt for power battery plate according to claim 3 is characterized in that: the total amount of the alloying element except nickel accounts for the 8-60% of electrodeposited coating total weight.

5, punched steel belt for power battery plate according to claim 4 is characterized in that: the total amount of the alloying element except nickel accounts for the 8-40% of electrodeposited coating total weight.

6, punched steel belt for power battery plate according to claim 3 is characterized in that: add cobalt and copper in nickel, the weight ratio of nickel, cobalt, copper is 4-5: 1.0: 2-3.

7, punched steel belt for power battery plate according to claim 5 is characterized in that: described alloy plated layer is made of nickel and cobalt, and the percetage by weight of cobalt is 8-12%.