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A heat treatment method for positive electrode lead belt or grid

A heat treatment method and technology of lead strips, which are applied in the field of heat treatment of positive electrode lead strips or grids, can solve the problems of internal residual stress and internal energy that cannot be effectively reduced, do not conform to industrial continuous production, and low production efficiency, so as to reduce chemical pollution. Stability, promotion of oxidation reaction, effect of prolonging cycle life

Active Publication Date: 2017-09-26
HUBEI CHUKAI METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heat treatment time of this patent is very short, which is not enough to recombine and recrystallize the finely divided structure after rolling, and the internal residual stress and internal energy generated by rolling deformation cannot be effectively reduced.
The heat treatment method of the patent CN1775962A is to carry out the annealing treatment in the annealing furnace after each rolling, and then carry out the next cold rolling, and the rolling directions of each adjacent time cross each other. This method does not meet the requirements of industrial continuous production. Especially in the continuous production of lead strips, the rolling directions of adjacent times intersect each other, which is difficult to realize, and the production efficiency is low, and this heat treatment method is still not enough to recombine and recrystallize the finely divided structure after rolling

Method used

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  • A heat treatment method for positive electrode lead belt or grid
  • A heat treatment method for positive electrode lead belt or grid
  • A heat treatment method for positive electrode lead belt or grid

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Use the continuous punching positive grid, enter the heating chamber to start heating up, set the holding temperature to 170°C, and the holding time to 3h;

[0022] Start heating and spray steam for 30 minutes at the same time, when the temperature rises to 90°C, stop spraying steam;

[0023] After the temperature rises to 170°C, keep warm for 3 hours;

[0024] Immediately stop heating after the holding time ends, and at the same time blow air into the heating chamber for forced cooling. After about 30 minutes, the grid will leave the heating chamber;

[0025] Store the grid after cooling down to room temperature until use.

[0026] Example 1 The rolling ratio of the positive electrode grid in the billet rolling process is relatively large (that is, the rolling deformation is relatively large), and the metallographic structure of the alloy is very fine, such as figure 1 shown. After heat treatment using this embodiment, the microstructure is reconstructed, and the gr...

Embodiment 2

[0028] Use cast slabs to roll the positive electrode lead strips, enter the heating chamber that has been heated to 200°C, and hold for 3.5 hours;

[0029] Stop heating immediately after the holding time ends, and spray water into the heating chamber for about 10 minutes at the same time, and keep it under this condition for 30 minutes;

[0030] Blow air into the heating chamber and force cooling. After about 20 minutes, the lead will be taken out of the heating chamber;

[0031] Store the lead strips after cooling down to room temperature for later use.

[0032] Example 2 The rolling ratio of the positive electrode lead strip in the billet rolling process is relatively small (that is, the rolling deformation is small), and the metallographic structure of the alloy shows that the grains are elongated by rolling, and the grains are not completely broken, such as image 3 shown. After heat treatment using this embodiment, the grain size is between 100μm-250μm, such as Figure...

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Abstract

The invention relates to a heat treatment method of a positive electrode lead band or grid and belongs to the technical field of lead-acid storage batteries. The heat treatment method of the positive electrode lead band or grid includes the following steps that the positive electrode lead band or grid is put in a heating chamber for increasing temperature by heating, heat is preserved for 1-5 h in the environment of the temperature of 150-250 DEG C, steam or atomized water is sprayed into the heating chamber in the heat treatment process, the positive electrode lead band or grid is located in the steam atmosphere, and finally the positive electrode lead band or grid is rapidly cooled to room temperature. Under the condition that efficient and continuous production of the lead band and the grid is not affected, proper heat treatment is carried out through the storage or circulation time of the lead band or the grid, a grain boundary structure is optimized, the fibrous structure and sub-grain structure in alloy are reconstructed, internal residual stress and internal energy, generated after rolling deformation, of the lead band or the grid are effectively reduced, chemical instability of the grid is reduced, and the anticorrosion performance of the grid is enhanced; and the surface of the lead band or the grid is treated in steam environments, the bonding strength of the grid and active substances is enhanced, and the cycle life of the batteries can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of lead-acid batteries, and in particular relates to a heat treatment method for a positive electrode lead strip or grid. Background technique [0002] Cast belt expanded grid and cast belt continuous punching grid have been widely used in starter lead-acid batteries and start-stop batteries. 1. The process of making lead billets into lead strips through multi-stage rolling, and then the lead strips are prepared into grids by expanding the mesh or punching holes. At present, the corrosion growth of the positive grid of the starter lead-acid battery and the start-stop battery is the main reason for the failure of the battery's high temperature life (SAEJ2801). In the case of a certain alloy composition, the microstructure of the alloy is the key factor affecting its mechanical properties and corrosion resistance. The microstructure of the alloy changes further, the grains are elongated or broken, and a larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/12
CPCC22F1/002C22F1/12
Inventor 刘长来刘小锋徐建刚孟刚张广军陈顺宏夏诗忠
Owner HUBEI CHUKAI METALLURGY
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