KR20080114328A - Negative electrode for nickel/zinc secondary battery and fabrication method thereof - Google Patents

Abstract

A fabrication method of a negative plate for a nickel/zinc secondary battery is provided to prevent the deintercalation of an electrode material caused by the expansion or shrinkage of an electrode according to the charging/discharging of a battery. A fabrication method of a negative plate for a nickel/zinc secondary battery comprises (a) a step(S110) punching a plurality of penetration holes in a metal plate; (b) a step(S130) filling a negative active material encapsulated between two metal plates; (c) a step(S140) forming a strip detaining the encapsulated negative active material between two metal plates by compressing the two metal plates with the encapsulated negative active material; (d) a step(S150) connecting at least two strips as the necessary capacity; and (e) a step(S160) inserting at least two strips into the negative plate frame.

Description

Negative electrode for nickel / zinc secondary battery and fabrication method

1 is a front view of a negative plate for a nickel / zinc secondary battery according to an embodiment of the present invention,

2 is a reference diagram illustrating an assembly process of a negative plate for a nickel / zinc secondary battery according to an embodiment of the present invention;

3 is a cross-sectional view taken along the line B-B 'of FIG.

4 is a detailed view illustrating a connection state of a strip in a negative electrode plate for nickel / zinc secondary batteries according to an embodiment of the present invention;

5A and 5B are perspective views illustrating the cutting of each strip in a state where the pellet-type negative electrode active material and the lump-shaped negative electrode active material are cut in the nickel / zinc secondary battery negative electrode according to the present invention;

6 is a detailed view showing an extract of the pellet-type negative electrode active material of Figure 5a,

7 is a process flowchart illustrating one manufacturing process of a negative electrode plate for a nickel / zinc secondary battery according to the present invention;

8 is a process flowchart illustrating another manufacturing process of the negative electrode plate for nickel / zinc secondary battery according to the present invention.

<Description of the symbols for the main parts of the drawings>

100; Strip 101,102: metal plate

101a, 102a: through hole 107: connecting portion

200: encapsulated negative electrode active material 200a: pellet-type negative electrode active material

200b: agglomerated anode active material 201: zinc powder

202: coating layer 203: additive

300: negative electrode plate frame 310: electrode terminal

The present invention relates to a negative electrode plate and a method of manufacturing the same, which is applied to a nickel / zinc secondary battery among rechargeable and rechargeable batteries, and more particularly, zinc oxide (ZnO) in a nickel-zinc (Ni-Zn) battery. The present invention relates to a negative electrode plate for a nickel / zinc secondary battery capable of suppressing decomposition of a negative electrode active material by an alkaline electrolyte by coating a metal layer on a surface of a negative electrode active material, and improving electrical properties of the negative electrode active material, and a method of manufacturing the same.

In addition, the present invention by adding a conductive material containing a metal oxide having a more electrical positive than zinc oxide (ZnO) to suppress the growth of zinc dendrite (Zn dendrite) generated during the charging / discharging of the battery by the negative electrode active material The present invention relates to a negative electrode plate for a nickel / zinc secondary battery capable of improving electrical characteristics and increasing capacity and cycle life, and a method of manufacturing the same.

In recent years, various environmental regulations have been implemented as a will to protect the environment of each country. Therefore, in small batteries, lead acid batteries and nickel / cadmium batteries have already been replaced with nickel / hydrogen and lithium ion batteries. However, in the field of industrial large batteries, no lead-acid batteries and nickel / cadmium batteries are used. Therefore, interest in environmentally friendly large capacity storage batteries is increasing, and technology development is intensively progressed accordingly.

Among them, nickel / zn batteries, which can replace lead-acid batteries, have similar volume and volumetric energy densities, high operating voltages of more than 1.6 [V / cell], and specific power density. 875 [W / kg] is better than 535 [W / kg] of lead acid battery, and the cycle life that reaches 80% of the maximum discharge capacity is also 600 times or more. There is a relatively stable advantage compared to.

Nevertheless, the commerciality of the nickel / zinc battery has a problem that is limited due to the decomposition of the zinc electrode, self discharge, protective film, shape change, dendritic crystallization.

Accordingly, the present invention has been made to solve the above problems, the present invention is to provide zinc oxide (ZnO) by coating a metal layer on the surface of the anode active material including zinc oxide (ZnO) in nickel-zinc (Ni-Zn) battery. It is an object of the present invention to provide a negative electrode plate for a nickel / zinc secondary battery capable of suppressing decomposition of the negative electrode active material including an alkaline electrolyte and improving electrical properties of the negative electrode active material, which is a non-conductor.

In addition, the present invention improves the electrical properties of the negative electrode active material, which is a nonconductor, by suppressing the growth of dendritic crystals of zinc generated during charging / discharging of a battery by adding conductive materials including metal oxides having more electrical positivity than zinc oxide (ZnO). Another object of the present invention is to provide a negative electrode plate for a nickel / zinc secondary battery and a method of manufacturing the same, which can increase the capacity and cycle life of the battery.

One feature of the present invention for achieving the above object, the negative electrode plate frame including an electrode terminal; The negative electrode plate for nickel / zinc secondary batteries, which is inserted into the negative electrode plate frame and is formed of two or more strips filled with a negative electrode active material encapsulated by a metal coating layer between two metal plates having a plurality of holes formed in a pocket shape.

Another feature of the present invention for achieving the above object is, (a) drilling a plurality of holes in the metal plate; (b) filling the encapsulated negative active material between the two metal plates with holes formed therein; (c) compressing the two metal plates together with the encapsulated negative electrode active material by applying an external force to the metal plate to form a strip that constrains the encapsulated negative electrode active material between the two metal plates; (d) connecting two or more strips to the required capacity; And (e) inserting the connected two or more strips into the negative electrode plate frame.

Another feature of the present invention for achieving the above object is, (a) drilling a plurality of holes in the metal plate; (b) filling the encapsulated negative active material between the two metal plates with holes formed therein; (c) compressing the two metal plates together with the encapsulated negative electrode active material by applying an external force to the metal plate, thereby forming a strip for constraining the encapsulated negative electrode active material between the two metal plates; (d1) respectively inserting the strips into the negative plate frame corresponding to the required capacity; And (e1) connecting the two or more strips inserted into the negative plate frame to each other.

In the method for manufacturing a negative electrode plate according to each feature of the present invention, (a1) any one metal selected from Cu, Ag, Cd, Zn, Pb, Sr, Bi, Sn, In, Ga, and Tl on the surface of the zinc powder Forming a metal coating layer to form a negative electrode active material encapsulated by the metal coating layer, or (a2) PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ on the surface of the zinc powder. Coating with any one of the metal oxide selected from to form a metal oxide coating layer, the step of forming a negative electrode active material encapsulated by the metal oxide coating layer selectively further before the step (b) each of the embodiments Can be implemented.

In addition, in each embodiment of the present invention, the zinc powder, PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ It is also possible to use a zinc powder mixed with an additive of any one metal oxide selected from among

In addition, in each embodiment of the present invention, the zinc powder in which the metal coating layer is formed in step (a1), or the zinc powder in which the metal oxide coating layer is formed in step (a2), PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ It is also possible to form an encapsulated anode active material by mixing an additive of any one metal oxide selected from among them.

In addition, the method for manufacturing a negative electrode plate according to each feature of the present invention, after the step (e) or (e1) of the step of pressing or welding the insertion portion of the negative plate frame and the strip, to be implemented in a form further implemented Can be.

Hereinafter, a negative electrode plate for a nickel / zinc secondary battery and a method of manufacturing the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view of a negative electrode plate for nickel / zinc secondary battery according to an embodiment of the present invention, Figure 2 is a reference diagram illustrating an assembly process of the negative electrode plate for nickel / zinc secondary battery according to an embodiment of the present invention. The negative electrode plate for the nickel / zinc secondary battery according to the present invention includes a negative electrode plate frame 300 including an electrode terminal 310 for charging / discharging a battery as shown in FIGS. 1 and 2, and a coating layer 202. The negative electrode active material 200 encapsulated by the inside is filled with two or more strips 100 inserted into and coupled to the negative plate frame, and coupled to the negative plate frame 300 and the strip 100 (W: As shown in an enlarged view of the portion indicated by AA ′ of FIGS. 1 and 2, the strip 100 is inserted into the negative electrode plate frame 300 and then pressed or welded by pressing. do.

The strip 100 includes two metal plates 101 and 102 having a plurality of through-holes 101 a and 102 a respectively formed and opposed to each other in a pocket, and an encapsulated negative active material filled in a pocket formed between the two metal plates. It consists of 200. The strip 100 is configured such that the two perforated metal plates 101 and 102 except for the encapsulated anode active material 200 can function as current collectors, whereby the current is supplied to the electrode terminal 310. To the encapsulated negative electrode active material 200 as an electrode material.

3 is a cross-sectional view taken along line B-B 'of FIG. 1, and FIG. 4 is a detailed view illustrating the connection state of strips in a negative electrode plate for nickel / zinc secondary batteries according to an embodiment of the present invention. 3 and 4 protrude the connecting portions 107 at the upper and lower ends thereof, respectively, as shown in FIGS. 3 and 4 so that they can be connected to each other through the connecting portions 107, and the strip 100 is connected to these connecting portions 107. By combining the two or more strips can be connected to each other. And each of the metal plates (101, 102) is preferably used to be formed in the inner concave to fill the negative electrode active material encapsulated in the center.

In addition, the through holes 101a and 102a which are drilled in the respective metal plates 101 and 102 are passages of the electrolyte solution that allow the electrolyte solution in the battery to sufficiently exist in the electrode, and preferably have a diameter of several tens of nm to several hundred nm. .

The metal plates 101 and 102 may be formed by drilling a plurality of through holes 101a and 102a in a steel plate (several thicknesses of several hundred μm to several mm) and then plating nickel or drilling the nickel plate directly.

5A and 5B are perspective views illustrating the cutting of each strip in a state where the pellet-type negative electrode active material and the lump-shaped negative electrode active material are charged in the nickel / zinc secondary battery negative electrode according to the present invention. FIG. 5A illustrates a case of filling a negative electrode active material 200a compressed into a pellet, and FIG. 5B illustrates a case of filling a negative electrode active material 200b in a lump form.

FIG. 6 (a) is a detailed view showing the pellet-type negative electrode material of FIG. 5a. The encapsulated negative electrode active material 200 is a pellet type 200a as shown in FIGS. 5a and 5b. ) Or agglomerates 200b. On the other hand, the powder of the negative electrode active material may be filled into the strip 100 as it is, or may be filled into a rectangular pellet form as shown in FIG. 6 by applying pressure to the negative electrode active material 200. At this time, the thickness (T) of the rectangular negative electrode active material made of pellets is higher than the depth of the recessed portion of the strip 100. In addition, the width L is smaller than the width of the metal plates 101 and 102. In addition, the length W is 5 [mm] or more.

The encapsulated anode active material 200 is preferably a coating layer 202 is formed by coating the surface of the zinc powder 201 with a metal or metal oxide, the zinc powder 201 with the coating layer 202 is formed The additive 203 made of a metal oxide may be mixed with each other. The coating layer 202 may be any one metal selected from Cu, Ag, Cd, Zn, Pb, Sr, Bi, Sn, In, Ga, and Tl, or PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O _{3 It} may be any one metal oxide selected from. The additive 203 may be any one metal oxide selected from PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , and Tl ₂ O ₃ .

That is, the encapsulated negative electrode active material 200 is also shown in Figure 6 (a), the surface of the zinc powder 201 Cu, Ag, Cd, Zn, Pb, Sr, Bi, Sn, In The zinc powder 201 can be encapsulated by the metal coating layer by coating with any one metal selected from Ga, and Tl (or with a metal alloy thereof) to form the coating layer 202.

In addition, the encapsulated anode active material 200 is another embodiment, and the surface of the zinc powder 201 is made of any one metal oxide selected from PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ . By coating to form a coating layer 202, the zinc powder 201 may be encapsulated by the metal oxide coating layer.

On the other hand, the encapsulated anode active material 200 is also shown in Figure 6 (b), the zinc powder is PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ It is also possible to use the zinc powder 201 mixed with the additive 203 of any one metal oxide selected from among them. This allows the additive 203 and the zinc powder 201 to be encapsulated by the coating layer 202 formed by the metal or the metal oxide, as shown in FIG.

In addition, the zinc powder in which the coating layer is formed of a metal or a metal oxide in the state in which the additive is not mixed may include PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ It is also possible to form an encapsulated anode active material by mixing an additive 203 made of any one metal oxide selected from among them.

7 is a process flow diagram illustrating a manufacturing process of a negative electrode plate for a nickel / zinc secondary battery according to the present invention, wherein (a) a plurality of through holes 101a and 102a are formed in a nickel plate or a nickel plated metal plate 101 and 102. Perforating step (S110), and (a1) coating a metal on the surface of the zinc powder (a2) by coating a metal oxide on the surface of the zinc powder, to form a negative electrode active material encapsulated by the coating layer (S120) and (B) filling the encapsulated anode active material 200 between the two metal plates 101 and 102 in which the through holes 101 a and 102 a are perforated (S130), and (c) applying external force to the metal plates 101 and 102. Adding the two metal plates together with the encapsulated negative electrode active material to form a strip 100 for constraining the encapsulated negative electrode active material between the two metal plates (S140); Connecting two or more sheets (S150) and, (e) the connection The negative electrode plate manufacturing process according to the present invention is performed by inserting two or more strips into the negative electrode plate frame 300 (S160), and after the step (e), the negative electrode plate frame 300 and the strip are selectively inserted. Pressing or welding the part may be further carried out.

FIG. 8 is a process flow diagram illustrating another manufacturing process of the negative electrode plate for nickel / zinc secondary batteries according to the present invention. (A) A plurality of through holes 101a and 102a are formed in the nickel plate or the nickel plated metal plates 101 and 102. Perforating step (S210) and (a1) coating a metal on the surface of the zinc powder or (a2) coating a metal oxide on the surface of the zinc powder, to form a negative electrode active material encapsulated by the coating layer (S220), (b) filling the encapsulated anode active material 200 between the two metal plates with the through holes 101a and 102a (S230), and (c) applying an external force to the metal plates 101 and 102 to apply the two sheets. Pressing the metal plate together with the encapsulated negative electrode active material to form a strip 100 for constraining the encapsulated negative electrode active material between the two metal plates (S240), and (d1) the number corresponding to the required capacity. Insert into the negative electrode plate frame 300 as much as (S250) and (e1) connecting the two or more strips inserted into the negative plate frame 300 (S260) to the negative electrode plate manufacturing process according to the present invention is made, after the step (e1) Pressing or welding the negative plate frame and the insertion portion of the strip may be further performed.

In the present invention, first, a plurality of through holes 101a and 102a are drilled in a nickel plate or a metal plate 101 and 102 on which nickel is plated to prepare a current collector to be used for a negative electrode plate. In addition, since the negative electrode active material including zinc oxide in the nickel / zinc secondary battery is decomposed by an alkaline electrolyte, in order to improve this, PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , and Tl ₂ O _{3 may be} selected. A negative electrode active material including zinc oxide (ZnO) on a powder mixed with any one metal oxide additive 203 or zinc powder containing no additive 203 is prepared.

Next, any one metal or metal alloy selected from Ag, Cu, Cd, Zn, Pb, Sr, Bi, Sn, In, Ga, and Tl having good electrical conductivity on the surface of the negative electrode active material on the powder, or PbO or Encapsulated anode active material, wherein the coating layer 202 is formed on the surface of the anode active material by coating a metal oxide selected from Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , and Tl ₂ O ₃ . 200).

That is, the zinc powder 201 mixed with the additive 203 of any one of metal oxides selected from PbO or a mixture of Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , and Tl ₂ O ₃ is not mixed or the additive is not mixed. On the surface of the zinc powder 201, any one metal selected from Cu, Ag, Cd, Zn, Pb, Sr, Bi, Sn, In, Ga, and Tl, or PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ The coating layer 202 is formed by coating with any one metal oxide selected from the group to form the negative electrode active material 200 encapsulated by the metal or metal oxide coating layer 202 as shown in FIG. 6.

Next, after filling the negative electrode active material 200 encapsulated as described above between the two metal plates in which the through holes 101a and 102a are perforated, an external force is applied to the metal plates 101 and 102 to encapsulate the two metal plates. By pressing together, a strip 100 for constraining the encapsulated negative electrode active material between two metal plates is formed.

Subsequently, as shown in FIG. 7, two or more strips are connected to each other by the required capacity to insert the strips into the negative plate frame 300, or as shown in FIG. 8, the strips are provided to the negative plate frame 300 by the number corresponding to the required capacity. After the insertion, two or more strips are connected to each other, and the negative electrode plate frame 300 and the insertion portion of the strip 100 are compressed or welded to complete the negative plate manufacturing process.

As a result, the negative electrode plate for the nickel / zinc secondary battery of the present invention manufactured by the strip 100 constraining the encapsulated negative electrode active material 200 as described above is formed on the coating layer 202 of the encapsulated negative electrode active material 200. As a result, the decomposition of zinc oxide (ZnO) to the alkaline electrolyte is suppressed.

In addition, since conductivity is imparted to the negative electrode active material, which is a non-conductor, by the coating layer 202, the metal plates 101 and 102 as the current collector and the negative electrode active material 200 are formed by electrical contact between the coating layers 202 and bonding between neighboring metal layers. Since the resistance present in between can be greatly reduced, the negative electrode active material can be physically bonded without using a separate binder, thereby improving the capacity and cycle life of the pocket battery.

In addition, when the coating layer 202 made of the metal conductive material is formed, conductive materials including a metal oxide having more electrical positivity than zinc oxide (ZnO) are added as the additive 203 to generate the charge / discharge of the secondary battery. Since the growth of the dendritic crystals of zinc can be suppressed, the electrical characteristics of the negative electrode active material can be improved to increase the capacity and cycle life.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the present invention, the capacity of zinc used in the negative electrode plate can be significantly increased compared to the negative electrode plate of the prior art using a binder (binder) and a conductive material. On the other hand, in the present invention, the plate-shaped thick nickel plate or nickel plated iron plate is placed on both sides of the electrode material to compress strongly to prevent desorption of the electrode material due to the expansion and contraction of the electrode due to the charge / discharge of the battery. It becomes possible. Therefore, since the detachment phenomenon of zinc does not occur, the cycle life of the secondary battery to which the negative electrode plate of the present invention is applied can be remarkably improved.

In addition, in the present invention, since the contact resistance between the metal plate and zinc is greatly reduced, the high rate discharge characteristics of the secondary battery can be remarkably improved, and the nickel plate on both sides of the negative electrode active material is used as a current collector, thus suddenly charging a large current. And during discharge, it is possible to prevent the heat generated by the resistance can be greatly improved the safety of the battery.

In addition, according to the present invention, a negative electrode active material (electrode material) is put between two nickel plates, each having a perforated through-hole, and a pocket strip is produced, and the strips are connected to each other to reach an electrode terminal when a predetermined capacity is reached. By connecting the terminals and the frames on both sides first, and then laminating the strip, and welding the same, a uniform electrode can be made large, and thus, there is an advantage of easily manufacturing a larger capacity battery.

Claims (22)

In the manufacturing method of the negative electrode plate for nickel / zinc secondary battery, (a) drilling a plurality of through holes in the metal plate; (b) filling the encapsulated negative active material between the two metal plates with the through holes perforated; (c) compressing the two metal plates together with the encapsulated negative electrode active material by applying an external force to the metal plate to form a strip that constrains the encapsulated negative electrode active material between the two metal plates; (d) connecting two or more strips to the required capacity; And (e) inserting the connected two or more strips into a negative electrode plate frame, the method of manufacturing a negative electrode plate for nickel / zinc secondary batteries. In the manufacturing method of the negative electrode plate for nickel / zinc secondary battery, (a) drilling a plurality of through holes in the metal plate; (b) filling the encapsulated negative active material between the two metal plates with the through holes perforated; (c) applying an external force to the metal plate to press the two metal plates together with the encapsulated negative electrode active material to form a strip that constrains the encapsulated negative electrode active material between the two metal plates; (d1) inserting the strip into the negative plate frame by the number corresponding to the required capacity; And (e1) a method of manufacturing a negative electrode plate for nickel / zinc secondary batteries, comprising connecting each other two or more strips inserted into the negative electrode plate frame. The method according to claim 1 or 2, Before the step (b), (a1) a metal coating layer on the surface of the zinc powder by coating with any one metal selected from Cu, Ag, Cd, Zn, Pb, Sr, Bi, Sn, In, Ga, and Tl Forming, to form a negative electrode active material encapsulated by the metal coating layer further comprising the method of manufacturing a negative electrode plate for nickel / zinc secondary battery. The method of claim 3, wherein the zinc powder, PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ Method for producing a negative electrode plate for nickel / zinc secondary battery, characterized in that the zinc powder mixed with an additive of any one metal oxide selected from. The method of claim 3, wherein PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O _{3 in} the zinc powder on which the metal coating layer is formed in step (a1) A method of manufacturing a negative electrode plate for nickel / zinc secondary batteries, characterized by constituting an encapsulated negative electrode active material by mixing an additive of any one metal oxide selected from among them. The method according to claim 1 or 2, Before the step (b), (a2) is coated with any one metal oxide selected from PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ on the surface of the zinc powder to form a metal oxide coating layer To form a negative electrode active material encapsulated by the metal oxide coating layer, the method of manufacturing a negative electrode plate for nickel / zinc secondary battery characterized in that it further comprises. The method of claim 6, wherein the zinc powder, A method for producing a negative electrode plate for nickel / zinc secondary batteries, characterized in that the zinc powder is mixed with an additive of any one of metal oxides selected from PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , and Tl ₂ O ₃ . The method of claim 6, PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O _{3 in} the zinc powder with the metal oxide coating layer formed in the step (a2) Method for producing a negative electrode plate for a nickel / zinc secondary battery, characterized in that to form an encapsulated negative electrode active material by mixing an additive of any one metal oxide selected from. The method according to claim 1 or 2, After the step (e) or (e1), after the strip is inserted into the negative plate frame, further comprising the step of pressing or welding the negative plate frame and the insertion portion of the strip nickel / zinc 2 characterized in that The manufacturing method of the negative electrode plate for secondary batteries. The method according to claim 1 or 2, The metal plate is nickel plated or a method for producing a negative electrode plate for nickel / zinc secondary battery, characterized in that consisting of a nickel plate. The method according to claim 1 or 2, The strip further comprises a connection portion protruding at the end, by combining these connections two or more strips are connected to each other manufacturing method of the negative electrode plate for nickel / zinc secondary battery. The method according to claim 1 or 2, The center of the two metal plate is formed in a concave shape to fill the negative electrode active material encapsulated, characterized in that the manufacturing method of the negative electrode plate for nickel / zinc secondary battery. The method according to claim 1 or 2, The encapsulated anode active material filled between the two metal plates is filled in a pellet or agglomerate form. An anode plate frame including electrode terminals; A negative electrode plate for nickel / zinc secondary batteries, comprising: two or more strips filled with a negative electrode active material encapsulated by a metal coating layer between two metal plates having a plurality of through holes formed in a pocket shape and inserted into the negative plate frame. . The method of claim 14, wherein the encapsulated negative electrode active material, Nickel / Zinc 2 characterized by forming a metal coating layer on the surface of the zinc powder by coating with a metal selected from Cu, Ag, Cd, Zn, Pb, Sr, Bi, Sn, In, Ga, and Tl Negative plate for secondary battery. The method of claim 14, wherein the encapsulated negative electrode active material, PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ on the surface of the zinc powder The negative electrode plate for nickel / zinc secondary battery, characterized in that the metal oxide coating layer was formed by coating with any one metal oxide selected from. The method of claim 15 or 16, wherein the encapsulated negative electrode active material, Zinc powder having the metal coating layer or the metal oxide coating layer, PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , Tl ₂ O ₃ The negative electrode plate for nickel / zinc secondary battery, characterized in that the mixture consisting of any one selected from metal oxide additives selected from. The method of claim 15, wherein the zinc powder, A negative electrode plate for nickel / zinc secondary batteries, characterized in that the zinc powder is mixed with additives of any one of metal oxides selected from PbO or Bi ₂ O ₃ , CdO, Ga ₂ O ₃ , and Tl ₂ O ₃ . The method of claim 14, The negative electrode plate of the nickel / zinc secondary battery, characterized in that the bonding portion of the negative electrode plate frame and strip is pressed or welded. The method of claim 14, The negative plate for nickel / zinc secondary battery, characterized in that the metal plate is nickel plated or nickel plated. The method of claim 14, A negative electrode plate for nickel / zinc secondary batteries, characterized in that the center of the metal plate is formed concave inside to accommodate the encapsulated negative electrode active material. The method of claim 14, An anode plate for a nickel / zinc secondary battery, characterized in that the encapsulated anode active material filled between the metal plates is filled in a pellet or agglomerate form.

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