Carbon-containing material light-weight grid for lead-acid storage battery and preparation method of carbon-containing material light-weight grid

A lead-acid battery, lightweight technology, applied in the direction of lead-acid batteries, battery electrodes, circuits, etc., can solve the problems of easy growth of the grid, poor creep resistance, short service life, etc., to reduce the quality of the grid, Strong electrical conductivity, lowering the quality of the effect

Active Publication Date: 2020-09-18
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the use of lead-antimony alloys. For example, when charging, the antimony in the positive electrode grid is dissolved and transferred to the negative electrode and deposited on the surface of the active material, which reduces the hydrogen evolution overpotential, and the antimony remaining on the surface of the positive electrode active material reduces. Oxygen evolution overpotential, causing the water decomposition voltage to drop, exacerbating the loss of water and the self-discharge of the battery
With the increase of antimony content, the corrosion resistance of the grid decreases, which accelerates the corrosion rate and shortens the cycle life of the battery
The lead-calcium alloy also has prominent disadvantages: poor creep resistance, the grid is easy to grow with the charging and discharging process, and the service life is short; in the process of casting, calcium is easily oxidized and burned, and it is difficult to control calcium. content; poor deep cycle performance, forming PbSO at the grid / active material interface 4 , CasO 4 and other substances, reduce the charging capacity of the battery, causing early and rapid capacity decay, etc.
Using this kind of composite electroplating technology, there is a problem of uneven plating, which affects the electrical conductivity of the grid. Moreover, the electroplating process requires a matrix material, and then electroplating is performed on the matrix material. The electroplating process itself also determines the material of the matrix material. Its mechanical properties must be excellent, so there will be a large proportion of the matrix material, and it is difficult to meet the requirements of light weight

Method used

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  • Carbon-containing material light-weight grid for lead-acid storage battery and preparation method of carbon-containing material light-weight grid
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  • Carbon-containing material light-weight grid for lead-acid storage battery and preparation method of carbon-containing material light-weight grid

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Effect test

Embodiment 1

[0049] The invention discloses a method for preparing a carbon-containing material lightweight grid for lead-acid batteries, which specifically comprises the steps of using graphene as an additive, heating and melting, dooming, or heating, melting and injection molding into a rod blank.

[0050]

[0051]

[0052] From the above experimental data, it can be seen that when the carbon-containing composite material is used to make a skin material with a strip-shaped skin-core structure or a tubular material with a strip-shaped tubular structure, the performance is better when the content of the carbon-containing material is 0.01%-5%. More preferably, the content of the carbonaceous material is 0.5%-3%. If the content of graphene is too much, the performance of the material will be reduced instead. Regarding the selection of carbon-containing materials, after adding graphene oxide, its tensile strength and electrical conductivity will decrease. Therefore, the carbon-containing...

Embodiment 2

[0054] A kind of preparation method of carbonaceous material lightweight grid for lead-acid storage battery of the present invention comprises the following steps:

[0055] (1) Put the rod blank of the carbon-containing composite conductive material for the grid into the groove of the extrusion wheel;

[0056] (2) Start the motor to rotate the extrusion wheel. Under the friction of the wheel groove wall, the rod billet is drawn into the arc-shaped extrusion cavity formed by the extrusion wheel and the cavity. Under the action, the rod blank is melted, extruded through the die to form a pipe, which is coated on the surface of the core material to form a carbon-containing composite conductive wire, or the pipe formed by extrusion through the die is directly used to make a grid, and the core is not filled other materials. In this embodiment, by controlling the thickness of the rod blank and the specifications of the mold, tubular skin layers of different specifications are prepa...

Embodiment 3

[0058] By adjusting the parameters of the above-mentioned ribs, the rib materials in the table below were prepared, and prepared into grids, and the cycle times of the batteries were measured after completion. The calculation of the lightweight parameters in the table below is based on the mass A of the lead grid of the same thickness, and B is the mass of the grid in the embodiment of the present invention, and the lightweight is (A-B) / A×100%.

[0059]

[0060]

[0061] It can be seen from the above-mentioned embodiments that on the basis of the first group of embodiments, changing the thickness ratio of the skin layer / core layer can change the electrical conductivity of the grid material, the degree of light weight and the number of cycles of 80% deep discharge, and when When the thickness of the skin layer / core layer is 0.2-2, the performance of the grid material is better, more preferably 0.2-1, wherein the thickness of the skin layer is 0.05-2 mm, and the diameter of t...

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Abstract

The invention discloses a carbon-containing material light-weight grid for a lead-acid storage battery and a preparation method of the carbon-containing material light-weight grid. Ribs of the carbon-containing material light-weight grid are of strip-shaped structures and comprise carbon-containing materials. The ribs are of a strip-shaped sheath-core structure or a strip-shaped tubular structure.The preparation method comprises: coating a core layer with a skin layer, and obtaining the carbon-containing composite conductive material in a cold extrusion coating mode, comprising the followingsteps: (1) a rod blank of the carbon-containing material entering an extrusion wheel groove, the rod blank being subjected to extrusion forming through a die orifice to form a tubular structure, and obtaining a skin layer of a tubular rib or a strip-shaped skin-core structure rib; (2) coating the core layer material with the tubular skin layer to obtain a rib material capable of being used for preparing the grid; and (3) preparing the grid of the lead-acid storage battery from the rib material. The grid has the advantages of strong conductivity, high strength, excellent corrosion resistance, excellent electrochemical reversibility, strong electrochemical activity and the like, the quality of the grid is greatly reduced compared with the prior art, and meanwhile, the preparation method is simple and controllable to operate.

Description

technical field [0001] The invention relates to the technical field of storage batteries, in particular to a carbon-containing material lightweight grid for lead-acid storage batteries and a preparation method thereof. Background technique [0002] Among all kinds of secondary batteries, lead-acid battery has become the battery product with the largest output in the world due to its advantages of low price, mature technology, reliable performance and high safety. Lead-acid batteries play an important role in various economic fields such as transportation, communication, electric power, military, navigation, aviation and aerospace. As the most important inactive component in lead-acid battery, the grid is mainly used to support the active material, conduct current and make the current distribution even. The selection of grid material has a great influence on the performance and life of the battery. As the carrier of the active material and the electrode collector, the compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/73H01M4/75H01M4/82H01M4/66H01M10/06
CPCH01M4/73H01M4/75H01M4/663H01M4/667H01M4/661H01M4/82H01M10/06Y02E60/10
Inventor 刘孝伟章晖周明明开明敏
Owner CHAOWEI POWER CO LTD
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