Method for curing and thermal-treatment drying of cathode wet raw plate

A drying and positive electrode technology, applied in the direction of lead-acid battery electrodes, etc., can solve the problems of difficult to stabilize the transformation of the positive electrode lead paste material crystal form, the drying time is still more than 18 hours, and the production cycle of the polar plate is elongated, so as to achieve curing. Drying, overall time reduction, strength-enhancing effects

Active Publication Date: 2019-02-01
CAMEL GRP XIANGYANG BATTERY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the announced heat treatment method adds a new production process, increases the workload of transshipment, and prolongs the production cycle of the plate, which brings some inconvenience to the production
[0003] On the other hand, at present, the curing and drying temperature of the positive plate of the lead-acid battery is basically within 90°C, and the drying time of the wet green plate after the curing stage is as long as 15-30h, especially the loading capacity of the wet green plate in the curing room is large, and the wet green plate When the number of stacked sheets is large, it takes a long time for the wet raw board to dry completely
Chinese patent CN 1330024C discloses a method of increasing pressure and temperature for curing: in the pressure range 170KPa-230KPa, temperature 115°C-125°C; or pressure range 250KPa-360KPa, temperature 126°C-140°C, the curing The time is shortened from tens of hours to 1.5-2 hours, but the drying time is still more than 18 hours
Moreover, the curing time announced in the patent is too short, and the test verification shows that it is difficult to complete the stable transformation of the positive electrode paste material crystal form within 1.5-2 hours

Method used

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  • Method for curing and thermal-treatment drying of cathode wet raw plate
  • Method for curing and thermal-treatment drying of cathode wet raw plate
  • Method for curing and thermal-treatment drying of cathode wet raw plate

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Embodiment 1

[0030] The main process of positive electrode wet raw board curing and heat treatment drying is as follows: figure 1 Shown, the concrete technical parameter of the present embodiment is as shown in table 1:

[0031] Table 1

[0032]

[0033] Step 1 curing stage: the temperature is set to 55°C, the relative humidity is set to 98%, and the time is set to 28h. The pressure relief valve and compressed air are closed, the circulating fan and atomized water humidification are turned on, the indoor pressure is at normal pressure (1atm), and the inlet and outlet dampers are under timing control.

[0034] Compressed air can also be turned on during the curing stage to ensure adequate oxygen in the curing chamber. However, since the atomized water contains compressed air, the atomization humidification process has the function of replenishing air; and when the inlet and outlet dampers are opened regularly, the moisture will be discharged from the outlet damper and the air will ente...

Embodiment 2

[0043] The main process of positive electrode wet raw board curing and heat treatment drying is as follows: figure 1 Shown, the concrete technical parameter of the present embodiment is as shown in table 2:

[0044] Table 2

[0045]

[0046] Step 1 Curing stage: divided into two sub-steps, the first step is to set the temperature to 45°C, the relative humidity to 95%, and the time to 18h; the second step to set the temperature to 65°C, the relative humidity to 80%, and the time to 6h. Close the pressure relief valve and compressed air, turn on the circulating fan and atomized water humidification, the indoor pressure is normal pressure (1atm), and the inlet and outlet dampers are in the timing control state.

[0047] Step 2 heat treatment heating and pressure raising stage: the temperature is set to 150°C, the opening pressure of the relief valve is set to 0.4 Mpa, and the heating time is set to 2h. During this process, the inlet and outlet dampers are closed and the ato...

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Abstract

A method for curing and thermal-treatment drying of a cathode wet raw plate, belonging to the technical field of lead-acid storage batteries, includes: curing the cathode wet raw plate at 40-70 DEG Cfor 18-40 h, relative humidity being 80-100%; setting temperature at 150-180 DEG C and opening pressure of a relief valve under 0.4-0.8 MPa and increasing the temperature for 1-3 h; when a preset temperature is reached, maintaining the temperature for 1.5-5 h; after the temperature maintenance is finished, reducing the pressure of the relief valve to normal pressure; finally, performing normal pressure drying for 3-8 h. In the curing and drying process of the wet raw plate, thermal treatment on a cathode grid is achieved, thus improving the anti-corrosion performance of the cathode grid, and meanwhile effectively shortening the total time of the curing and thermal-treatment drying. The method avoids the adverse effect such as addition of production steps and transfer working load and increase of production period, which are caused by independent thermal-treatment on a cathode lead tape or the cathode grid.

Description

technical field [0001] The invention belongs to the technical field of lead-acid storage batteries, and in particular relates to a method for solidifying and heat-treating a positive wet raw plate. Background technique [0002] Appropriate heat treatment of the rolled lead strip and the grid prepared by rolling the lead strip can reduce the internal residual stress and internal energy of the positive electrode grid alloy of the lead-acid battery, and promote the grain boundary reconstruction and regeneration of the grid alloy. Crystallization reduces the chemical instability of the grid alloy and enhances the corrosion resistance of the positive grid of the lead-acid battery. US Patent US 6802917 B and Chinese Patents CN 106435421 B, CN102925834A, and CN1775962A all demonstrate the beneficial improvement of the corrosion resistance of the positive grid after heat treatment. However, the announced heat treatment method adds a new production process, increases the workload of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/20H01M4/21
CPCH01M4/20H01M4/21Y02E60/10
Inventor 刘小锋孟刚张仁银徐建刚邓国强夏诗忠刘长来
Owner CAMEL GRP XIANGYANG BATTERY
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