阅读说明：本技术 一种蓄电池极板及其表面处理工艺 (Storage battery polar plate and surface treatment process thereof ) 是由 陈俊辉 罗香湘 王涛 徐建刚 郭树演 夏诗忠 刘长来 于 2019-07-10 设计创作，主要内容包括：一种蓄电池极板及其表面处理工艺,将连续网状的扩展板栅与底部的涂板纸一同经过涂填机头后,铅膏涂覆到板栅上,随后通过一排耐酸雾化喷头将淋酸溶液喷涂到极板带正面,淋酸溶液与极板带正面铅膏反应,形成硫酸铅层；极板带经过切刀后,被分切成单片的极板,极板一面为覆纸层,一面为硫酸铅层。本发明解决了双面覆纸工艺出现破损、掉纸及涂板纸进入电池后产生杂质的不足。能够降低因极板掉纸导致的包封停机次数,提高生产效率,同时能够减少涂板纸的使用量,降低电池自放电速率。本发明制备的蓄电池极板降低了电池自放电速率,电池质量好。(A storage battery polar plate and its surface treatment process, after spreading the slab lattice of continuous netted and coating the paper of board at the bottom together through the coating and filling aircraft nose, the lead plaster is coated on the slab lattice, spray the acid drenching solution to the positive of the polar plate strip through a row of acid-proof atomizer subsequently, the acid drenching solution reacts with the positive lead plaster of the polar plate strip, form the lead sulfate layer; after the polar plate strip passes through the cutter, the polar plate strip is cut into single polar plates, one surface of each polar plate is a paper-coated layer, and the other surface of each polar plate is a lead sulfate layer. The invention solves the defects of breakage, paper falling and impurity generation after coated paper enters a battery in the double-sided paper coating process. The packaging shutdown frequency caused by the falling of the paper of the polar plate can be reduced, the production efficiency is improved, the use amount of the coated paper can be reduced, and the self-discharge rate of the battery is reduced. The battery plate prepared by the invention reduces the self-discharge rate of the battery and has good battery quality.)

1. A surface treatment process for a storage battery pole plate is characterized by comprising the following steps: after the continuous netted expanded grid and the coated paper at the bottom pass through a coating and filling machine head, lead plaster is coated on the grid, then acid spraying solution is sprayed to the front side of the polar plate belt through a row of acid-resistant atomizing nozzles, and the acid spraying solution reacts with the lead plaster on the front side of the polar plate belt to form a lead sulfate layer; after the polar plate strip passes through the cutter, the polar plate strip is cut into single polar plates, one surface of each polar plate is a paper-coated layer, and the other surface of each polar plate is a lead sulfate layer.

2. The battery plate surface treatment process according to claim 1, characterized in that: the lead plaster coating speed of the expanded grid is 25-30 m/min; the density of the acid spraying solution used for spraying is 1.12 +/-0.01 g/cm 3.

3. The battery plate surface treatment process according to claim 1, characterized in that: the acid leaching solution is prepared from the following raw materials in parts by weight: 8-10 parts of concentrated sulfuric acid, 1-1.5 parts of sodium perborate, 0.4-1 part of polyvinyl alcohol and 70-90 parts of pure water.

4. The battery plate surface treatment process according to claim 3, characterized in that: the acid leaching solution is prepared in the following way: weighing the raw materials in the acid leaching solution according to the proportion, adding sodium perborate and polyvinyl alcohol into pure water, stirring uniformly, then gradually adding concentrated sulfuric acid solution within 3-4min under the stirring state, and cooling to obtain the acid leaching solution.

5. The battery plate surface treatment process according to claim 1, characterized in that: the acid spraying amount of the front surface of each polar plate is 0.17 +/-0.03 g/plate.

6. The battery plate surface treatment process according to claim 1, characterized in that: the coating paper is common coating paper for the polar plate and is attached to the back of the polar plate so as to prevent the pasted lead plaster from separating from the grid under the action of gravity.

7. A battery plate prepared by the battery plate surface treatment process of any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of storage battery production, in particular to a storage battery pole plate surface treatment process and a storage battery pole plate prepared by the process.

Background

As a basic industrial consumable, the lead-acid storage battery has huge market demand, and in order to improve the production efficiency and meet the market demand in time, the Italy Soviema continuous coating line is introduced to improve the production efficiency of the storage battery.

According to the original design, in the continuous coating and filling process, in order to prevent the pole plates from dropping paste, a double-sided paper coating process is generally adopted, namely, two sides of the pole plates are coated with paperboard. However, in the actual use process, the coated paper is damaged after being subjected to high temperature, so that the shutdown condition often occurs due to the falling of the polar plate paper during the packaging process. Meanwhile, after the coated paper enters the battery, impurities are generated after the coated paper is dissolved, so that the self-discharge speed of the battery is accelerated.

Disclosure of Invention

In order to solve the technical problems, the invention provides a surface treatment process for a storage battery plate, which can reduce the packaging shutdown times caused by the falling of paper of the plate, improve the production efficiency, reduce the use amount of coated paper and reduce the self-discharge rate of a battery.

The invention also provides the storage battery pole plate prepared by the storage battery pole plate surface treatment process, and the storage battery pole plate reduces the self-discharge rate of the battery and improves the quality of the battery.

The technical scheme of the invention is as follows: after the continuous netted expanded grid and the coated paper at the bottom pass through a coating and filling machine head, lead plaster is coated on the grid, then acid spraying solution is sprayed to the front side of the polar plate belt through a row of acid-resistant atomizing nozzles, and the acid spraying solution reacts with the lead plaster on the front side of the polar plate belt to form a lead sulfate layer; after the polar plate strip passes through the cutter, the polar plate strip is cut into single polar plates, one surface of each polar plate is a paper-coated layer, and the other surface of each polar plate is a lead sulfate layer.

The lead plaster coating speed of the expanded grid is 25-30 m/min; the density of the acid spraying solution used for spraying is 1.12 +/-0.01 g/cm 3.

The acid leaching solution is prepared from the following raw materials in parts by weight: 8-10 parts of concentrated sulfuric acid, 1-1.5 parts of sodium perborate, 0.4-1 part of polyvinyl alcohol and 70-90 parts of pure water.

The acid leaching solution preparation method comprises the following steps: weighing the raw materials in the acid leaching solution according to the proportion, adding sodium perborate and polyvinyl alcohol into pure water, stirring uniformly, then gradually adding concentrated sulfuric acid solution within 3-4min under the stirring state, and cooling to obtain the acid leaching solution.

The acid spraying amount of the front surface of each polar plate is 0.17 +/-0.03 g/plate, and the pressure of the acid spraying solution in the polar plate is changed by adjusting and controlling the valve of the acid-resistant atomizing nozzle, so that the spraying amount is adjusted

The coated paper is common coated paper for polar plates and is attached to the back of the polar plate so as to prevent lead plaster coated with the lead plaster from separating from a grid under the action of gravity.

The invention improves the existing double-sided paper-coating process into a single-sided paper-coating and acid-spraying process.

Compared with the prior art, the invention has the advantages that the packaging shutdown times caused by the falling of the paper of the polar plate are reduced, the production efficiency is improved, the usage amount of the paper coated plate is reduced, the self-discharge rate of the battery is reduced, and the quality of the battery is improved; on the basis of ensuring the production efficiency and the quality of the polar plate, the use amount of the coated paperboard is reduced by 50 percent, the encapsulation outage rate is reduced by 90 percent, and the self-discharge speed of the battery is reduced by 40 to 50 percent.

Detailed Description

The present invention will be further described with reference to the following examples.

A surface treatment process for a storage battery plate comprises the following steps:

after the continuous netted expanded grid and the coated paper at the bottom pass through a coating machine head, lead plaster is coated on the grid, then acid spraying solution is sprayed to the front side of the polar plate belt through a row of acid-proof atomizing nozzles according to the amount of 0.17 g/sheet (obtained by calculating the acid spraying density according to the spraying thickness × of the area × of the plate surface), the acid spraying solution reacts with the lead plaster on the front side of the polar plate belt to form a lead sulfate layer, the polar plate belt is cut into single polar plates after passing through a cutter, one surface of each polar plate is a paper coating layer, and the other surface of each polar plate is a lead sulfate layer, wherein the coating speed is 25m/min-30m/min;the density of the acid spraying solution used for spraying is 1.12 +/-0.01 g/cm³The spraying amount of the acid-leaching solution is realized by adjusting and controlling a valve of an acid-resistant atomizing nozzle so as to change the pressure of the acid-leaching solution inside.

In the invention, the amount of the acid-leaching solution on the front side of the storage battery plate belt is strictly controlled, a uniform lead sulfate crystal layer is formed on the surface of the plate while secondary recycling caused by multiple acid leaching is avoided, the formed lead sulfate is needle-shaped and is mutually interwoven, the condition that a large amount of powder on the surface of the plate is removed in the manufacturing process because the binding force of the plate is not strong is avoided, the strength of the surface of the plate is enhanced by acid leaching after the plate is coated with paste, the situations of lead paste falling off on a grid and the like can be prevented, the scrapping of the plate is reduced, and the difficulty of on-site dust protection is reduced.

The acid showering solution used in the invention can improve the water content of the polar plate after the subsequent drying and before the solidification, and the improvement of the water content of the polar plate can be beneficial to the solidification of the polar plate, thereby improving the strength of the polar plate and ensuring that the polar plate is not easy to remove paste, crack and fall off powder. The sodium perborate is decomposed at high temperature in the curing stage to release oxygen, so that the problem that the oxygen is difficult to enter the inner part of the polar plate after the existing polar plate is stacked and cured can be solved, and the oxidation speed of the active substance of the polar plate is improved.

The curing time of the polar plate treated by the process is shortened by 3-4 hours compared with the original curing time due to the characteristic that the sodium perborate releases oxygen when being heated.

After the polar plate treated by the process is solidified and encapsulated, the acid spraying surface of the polar plate is selected for absorbing the plate and encapsulating, compared with the original double-layer paper-coated polar plate, the encapsulating outage rate is reduced by 90%, and meanwhile, the dust on site is greatly reduced.

The polar plate treated by the process only has coated paper on one surface, and compared with the original double-layer paper-coated polar plate, the content of impurities brought into the battery by the coated paper is reduced, so that the self-discharge speed of the battery is reduced by 40-50%.

The raw materials and equipment in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.