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Curing process of polar plate used for lead-acid battery pack

A technology of power battery and curing process, which is applied in the direction of lead-acid battery electrodes, etc., can solve the problems of reduced porosity of active materials, shortened battery life, and shedding of active materials, so as to slow down softening and shedding, prolong service life, and improve bonding force effect

Inactive Publication Date: 2013-06-05
江苏海宝电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since Pb (with a density of 11.34 g / cm 3 ) PbSO 4 (with a density of 6.32 g / cm 3 ) PbO 2 (with a density of 9.37 g / cm 3 ) during the transformation process, the volume changes greatly, and the stress generated by the internal volume expansion of the plate after curing through the existing curing process will cause the plate to bend and the active material to fall off.
At the same time, due to the increase in the volume of the active material, the porosity of the active material will decrease, so that the oxygen generated during the formation of the positive plate is not easily transported to the surface of the plate and overflows, and accumulates inside the plate to generate pressure. Oxygen overcomes the resistance of the liquid in the gap from the inside of the plate, and has a scouring effect when moving to the surface of the plate, causing the active material to fall off and shortening the service life of the battery
[0004] In addition, the existing curing process of lead-acid power battery plates is generally medium-low temperature and normal pressure curing, the curing steps are complicated, and the curing time is long, generally 48-72h

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put the coated plate into a pressure curing box, the temperature in the curing box is controlled at 75℃, the humidity is controlled at 98%, and the pressure is controlled at 0.8MPa. After curing for 3 hours, the humidity is reduced to below 30%, and the pressure drops. To normal pressure, dry at 75℃ for 5h. After curing, the free lead and moisture content of the cured plate are both below 1%.

Embodiment 2

[0014] Put the coated plate into a pressure curing box, the temperature in the curing box is controlled at 90℃, the humidity is controlled at 100%, and the pressure is controlled at 1MPa. After curing for 2 hours, the humidity is reduced to below 30% and the pressure is reduced to At normal pressure, dry for 3 hours at 90°C. After curing, the free lead and moisture content of the cured plate are both below 1%.

Embodiment 3

[0016] Put the coated plate into a pressure curing box, the temperature in the curing box is controlled at 70℃, the humidity is controlled at 95%, and the pressure is controlled at 0.5MPa. After curing for 4 hours, the humidity is reduced to below 30%, and the pressure drops. To normal pressure, dry for 6 hours at 70℃. After curing, the free lead and moisture content of the cured plate are both below 1%.

[0017] The above-mentioned cured electrode plates were assembled into 12V12Ah valve-regulated sealed lead-acid batteries for electric bicycles according to the current production process of valve-regulated sealed lead-acid batteries for performance testing. The 6A discharge time was 135 minutes and 100% DOD cycle. The service life has reached 500 times, and the other performance indicators meet the requirements in GB / T22199-2008 "Sealed Lead-Acid Battery for Electric Mopeds". The result proves that the valve-regulated sealed lead-acid power battery prepared by adopting the cur...

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Abstract

The invention discloses a curing process of polar plate used for a lead-acid battery pack, which comprises two steps of curing and drying, and is characterized in that curing is carried out by employing high temperature, and high wet and compression. The curing process has the advantages that the step of curing is carried out with one step, the process is simplified, the curing time is shortened, the curing effect is increased, and free lead and moisture of the cured polar plate are less than 1% through detection.

Description

Technical field [0001] The invention relates to a solidification process of an electrode plate for a lead-acid power battery, and belongs to the technical field of sealed lead-acid batteries. Background technique [0002] In the production process of lead-acid batteries, curing is a very important production process, and curing is divided into two stages: curing and drying. The curing process is mainly completed: (1) oxidation of free lead to increase the capacity of the active material; (2) oxidation of lead on the surface of the grid ribs to increase the binding force between the grid ribs and the active material; (3) basic formula Recrystallization of lead sulfate improves the strength of the plate. The drying process mainly completes the drying of the electrode plate, enhances the strength of the electrode plate and forms a porous electrode. [0003] After curing, the free lead content in the electrode plate should be reduced to less than 5%, preferably not more than 1%. This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/16
CPCY02E60/126Y02E60/10
Inventor 闫智刚沈维新周丽娜杨海涛
Owner 江苏海宝电池科技有限公司
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