阅读说明：本技术 一种锌氧化银电池正极用导电骨架及其制造方法 (Conductive framework for positive electrode of zinc-silver oxide battery and manufacturing method thereof ) 是由 赵书利 贺必新 宋红磊 金岑 张伟东 于 2021-01-15 设计创作，主要内容包括：本发明公开了一种锌氧化银电池正极用新型低阻抗导电骨架及其制造方法,通过物理气相沉积(PVD)、喷射或模塑等工艺,在常规正极银或镀银导电骨架的基础上,复合一层耐氧化导电塑料层。本发明具有低阻抗,高稳定性,克服了原有正极银导电骨架使用过程中初期阻抗过高的不足。采用本发明,以15C电流放电时,起始电压由1.17V～1.19V提高到1.25V～1.27V,提高单体电池初始放电电压60mV以上,提高成组电池使用可靠性。(The invention discloses a novel low-impedance conductive framework for a zinc-silver oxide battery anode and a manufacturing method thereof. The invention has low impedance and high stability, and overcomes the defect of overhigh impedance at the initial stage in the use process of the original positive electrode silver conductive framework. By adopting the invention, when the battery is discharged at the current of 15C, the initial voltage is increased from 1.17V-1.19V to 1.25V-1.27V, the initial discharge voltage of the single battery is increased by more than 60mV, and the use reliability of the grouped battery is improved.)

1. The utility model provides a zinc oxidation silver battery is electrically conductive skeleton for positive pole which characterized in that: comprises a silver-containing metal conductive net (1) and an oxidation-resistant conductive plastic layer (2) coating the metal conductive net (1); the metal conductive net (1) is a woven or drawn net with square/prismatic holes; the oxidation-resistant conductive plastic layer (2) is low-impedance high-molecular conductive plastic; the metal conductive net (1) and the oxidation-resistant conductive plastic layer (2) are integrally or partially compounded.

2. The conductive framework for the positive electrode of the zinc-silver oxide battery according to claim 1, wherein the metal conductive mesh (1) is silver, silver-plated copper or silver-plated aluminum.

3. The conductive framework for the positive electrode of the zinc-silver oxide battery according to claim 1, wherein the oxidation-resistant conductive plastic layer (2) is a low-impedance high-molecular conductive plastic with the thickness of 2-30 μm.

4. The preparation method of the conductive framework for the positive electrode of the zinc-silver oxide battery according to claim 1, which is characterized by comprising the following steps:

1) preparing a metal conductive mesh

Weaving the metal wires made of silver/silver-plated copper/silver-plated aluminum materials into square meshes on a weaving net machine by adopting a weaving mould to obtain a conductive weaving net;

or, cutting parallel grooves at one end of a rectangular metal plate made of silver/silver-plated copper/silver-plated aluminum, uniformly cutting slits at intervals on the rest part along the extension lines of the parallel grooves, wherein the length difference of the adjacent parallel grooves is half of the center distance of the two slits, the distance between the slits and the parallel grooves is equal to the longitudinal interval between the slits, and the slits are drawn into prismatic meshes on a net drawing machine by adopting a net drawing die to obtain the conductive net drawing;

2) oxidation-resistant conductive plastic layer composition

And compounding an oxidation-resistant conductive plastic layer (2) with the thickness of 2-30 microns on the conductive knitted net or the conductive stretched net through a physical vapor deposition, injection or molding process.

Technical Field

The invention belongs to a structural component of a zinc-silver oxide battery, and particularly relates to a novel low-impedance conductive framework for a zinc-silver oxide battery anode and a manufacturing method thereof.

Background

The anode framework of the existing zinc-silver oxide battery is usually made of silver or silver-plated netting or woven netting.

The positive electrode framework of the zinc-silver oxide battery adopts silver or silver plating, and in the laying process, the positive electrode active substance silver peroxide (AgO) and the framework silver (Ag) are subjected to chemical reaction to generate high-impedance silver oxide (Ag)₂O). When the zinc-silver oxide battery is used, the internal impedance is too high in the initial stage, the initial and early-stage voltage of the zinc-silver oxide battery is obviously reduced, the electrical property of the zinc-silver oxide battery is lower than the technical index requirement, the use requirement cannot be met, the current density has to be reduced, and the specific energy of the battery is obviously reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a novel low-impedance conductive framework for a zinc-silver oxide battery anode, and also provides a manufacturing method of the framework, which is suitable for manufacturing a high-rate discharge zinc-silver oxide battery.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problem is as follows: a conductive framework for a zinc-silver oxide battery positive electrode comprises a silver-containing metal conductive net and an oxidation-resistant conductive plastic layer coating the metal conductive net; the metal conductive net is a metal woven net/metal pull net with square/prismatic holes; the oxidation-resistant conductive plastic layer is low-impedance high-molecular conductive plastic; the metal conductive net and the oxidation-resistant conductive plastic layer are integrally or partially compounded into a whole.

The metal conductive net of the conductive framework for the positive electrode of the zinc-silver oxide battery is silver, silver-plated copper or silver-plated aluminum.

The oxidation-resistant conductive plastic layer of the conductive framework for the positive electrode of the zinc-silver oxide battery is low-impedance high-molecular conductive plastic with the thickness of 2-30 micrometers.

The invention also discloses a preparation method of the conductive framework for the positive electrode of the zinc-silver oxide battery, which comprises the following steps:

1) preparing a metal conductive net: weaving the metal wires made of silver/silver-plated copper/silver-plated aluminum materials into square meshes on a weaving net machine by adopting a weaving mould to obtain a conductive weaving net; or, cutting parallel grooves at one end of a rectangular metal plate made of silver/silver-plated copper/silver-plated aluminum, uniformly cutting slits at intervals on the rest part of the rectangular metal plate along the extension lines of the parallel grooves, wherein the length difference of the adjacent parallel grooves is half of the center distance of the two slits, the distance between the slits and the parallel grooves is equal to the longitudinal interval between the slits, adopting a net pulling die for the part with the uniform slits on the rectangular metal plate, and pulling the part of the rectangular metal plate into prismatic meshes on a net pulling machine to obtain the conductive pull net;

2) and compounding an oxidation-resistant conductive plastic layer: and compounding an oxidation-resistant conductive plastic layer with the thickness of 2-30 mu m on the conductive netting or the conductive net by Physical Vapor Deposition (PVD), injection or molding and other processes.

The invention has the beneficial effects that:

the invention compounds an oxidation-resistant conductive plastic layer on the basis of a conventional positive electrode silver or silver-plated conductive framework through Physical Vapor Deposition (PVD), injection or molding and other processes, thereby solving the problem that the high-impedance Ag is generated due to the contact of a positive electrode active substance AgO and the silver framework in the traditional storage battery framework₂O（Ag：1.59×10^-6Ω·cm；Ag₂O： 10⁸Ω·cm；AgO： 10⁸Omega cm), greatly reduces the initial voltage of the battery when in use, and further influences the normal use of the zinc-silver oxide battery with high-rate discharge.

The invention has low impedance and high stability, and overcomes the defect of overhigh impedance at the initial stage in the use process of the original positive electrode silver conductive framework. By adopting the invention, when the battery is discharged at the current of 15C, the initial voltage is increased from 1.17V-1.19V to 1.25V-1.27V, the initial discharge voltage of the single battery is increased by more than 60mV, and the use reliability of the grouped battery is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a sectional view taken along a line a-a in fig. 1.

The figures are numbered: 1-metal conductive net, 2-oxidation resistant conductive plastic layer.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the silver oxide battery frame of the present invention includes a metal conductive mesh 1 and an oxidation-resistant conductive plastic layer 2. The metal conductive net 1 is a woven or drawn net/metal woven net or metal drawn net with square/prismatic holes, and the metal conductive net 1 is silver, silver-plated copper or silver-plated aluminum; the oxidation-resistant conductive plastic layer 2 is low-impedance high-molecular conductive plastic with the thickness of 2-30 mu m; the metal conductive net 1 and the oxidation-resistant conductive plastic layer 2 are wholly or partially compounded into a whole. Because the surface of the metal net is compounded with the oxidation-resistant conductive plastic layer, the formed silver positive electrode framework not only plays the roles of conducting current and equally dividing the surface potential of the electrode, but also plays the roles of supporting and keeping active substances. In order to reduce internal resistance and polarization, on the basis of basic theoretical research, the influence of a flow guide body on electrode polarization and active material utilization rate is researched, and the flow guide body is analyzed to be suitable for a power zinc-silver oxide battery with high-rate discharge.

The preparation method of the invention comprises the following steps.

1) And preparing the metal conductive net.

And weaving the metal wires made of silver/silver-plated copper/silver-plated aluminum materials into square meshes on a weaving net machine by adopting a weaving mould to obtain the conductive weaving net.

Or, cutting parallel grooves at one end of a rectangular metal plate made of silver/silver-plated copper/silver-plated aluminum, uniformly cutting slits at intervals on the rest part of the rectangular metal plate along the extension lines of the parallel grooves, wherein the length difference of the adjacent parallel grooves is half of the center distance of the two slits, the distance between the slits and the parallel grooves is equal to the longitudinal interval between the slits, adopting a net pulling die for the part with the uniform slits on the rectangular metal plate, and pulling the part of the rectangular metal plate into prismatic meshes on a net pulling machine to obtain the conductive pull net.

2) And compounding an oxidation-resistant conductive plastic layer: and compounding an oxidation-resistant conductive plastic layer 2 with the thickness of 2-30 mu m on the conductive netting or the conductive net by Physical Vapor Deposition (PVD), injection or molding and other processes.

21) Physical vapor deposition composite oxidation-resistant conductive plastic layer: under the vacuum condition, the oxidation-resistant conductive plastic is evaporated and then deposited on the surface of the metal mesh substrate to prepare the novel low-impedance conductive framework.

22) And compounding an oxidation-resistant conductive plastic layer by a spraying method: the surface of the metal mesh substrate is compounded with a layer of oxidation-resistant conductive plastic by a spraying method, so that the original characteristics of the substrate can be kept, and the oxidation resistance and the conductivity of the conductive plastic can be realized.

The invention has the advantages of low impedance and high stability, can meet the requirements of the zinc-silver oxide battery with high multiplying power and heavy current discharge, and can improve the initial and initial electrical property and environmental adaptability of the battery compared with the commonly adopted silver mesh and pull-mesh framework.

When the battery works, the active substance generates electrochemical reaction on an oxidation-resistant plastic interface, the electrochemical reaction is generated by the active substance which is transmitted to the battery active substance attached on the current collector of the electrode through conductive plastic, the generated current is transmitted to a lug of a silver positive electrode framework through the conductive plastic, and then is conducted to a battery pole through the lug and finally is conducted to electric equipment through the pole.

The above-described embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments may be applied, and it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the inventive concept of the present invention, and these embodiments are within the scope of the present invention.