Lead-acid battery production process

The development of battery manufacturing industry has entered the era of labor-intensive, capital-intensive, knowledge-intensive and technology-intensive enterprises. The emergence of all kinds of new battery products, the improvement of product manufacturing complexity, the application of high-precision equipment, the battery industry

With the rapid development of electric vehicles and the car, the car with the power source and the rapid development, but the battery has a lot of problems in production, caused the market's battery product quality is uneven, the capacity of the battery cycle life can not meet the design service life of the late, this in battery in production has its unique production process has a lot to do. The battery is composed of a shell, a cover, a plate, a separator, a bus bar, a pole pole, a bridge protection plate, a terminal and other components.

Plate weighing

Secco emperor plate

Secco emperor plate

1. First of all, each battery internal plate weighing, and plate assembly. Capacity of each cluster capacity should be equal, or small group for capacity while on a full charge in advance, so large capacity battery pack is not yet full of, low voltage of the battery, the voltage is not the termination voltage continued charging, a group of small cause capacity to form of charging, if, when the battery discharge capacity of the group that small charge in advance, the rest of the high voltage of the battery, the battery without electric power to terminate the total voltage protection voltage, discharge continues, however, creates a battery over discharge.

Overcharge, overdischarge and untimely charging of the battery will affect the service life of the battery. However, the battery capacity of the group with small battery decreases further, which further leads to overcharge and overdischarge of the group. As a result, the battery capacity is rapidly reduced and discarded.

2. Treatment of plate before weighing

Before weighing the plate, the excess front edge, burr and excess active material in the process of anointing should be clearly removed. If the plate is not clean, it will cause a short circuit of the battery plate, that is, the battery self-discharge. The extra impurities on the electrode plate should be cleaned with the earphone brush to facilitate welding, so as to prevent false welding. To have uneven plate, serious powder, plate with holes, selected.

3. How do the plates weigh

In plate weighing distribution group, said the first part of the plate according to the weight of different discharge in turn on the workbench, than mark weight, and then in the said no weighing plate in the weighing device according to the weight of each plate, according to the weight of the plate and placed on the worktable plate placed together, so it was some trouble. (the weight difference between positive plates or negative plates should be as small as possible. The error between 10 ~ 14AH and 17 ~ 20AH should be no more than 1g and 2 g respectively.

Bag clapboard

1. After the weighing of the plate in accordance with the provisions of the weight of the group, with the group after the packing plate, the material of the partition universal microporous rubber, glass fiber, in the package to pay attention to the cleaning of the partition, the plate in the middle of the partition, if the position of the plate alignment, placed in the plate box.

Secco emperor partition

Secco emperor partition

2. Double piece wrap positive plate, use very thin clapboard piece to hold positive plate together only, do not wrap negative plate, can avoid the short circuit that single piece clapboard defect causes so. Single piece cladding board, use cladding board to pack positive plate only, do not pack negative plate to put inside cladding board box, convenient and simple.

Lead parts selection and processing

1. The lead parts are made of lead welding rod and pole pole with special moulds. Generally at about 450 ℃, high temperature oxidation of lead, lead a crack caused by shrink serious, are not allowed to use the iron hammer mold. Make sure the lead is free of spines and trim, if any.

Emperor lead pieces

Emperor lead pieces

1. Cluster welding. The welding is to weld the positive and negative poles together with lead to form a cluster, and use oxygen-acetylene in the tool connecting pole pole and bus bar.

2. Put the wrapped plate in the cluster box, and insert the plate in the cluster box into the comb board. First insert the negative pole in the positive pole, so that the pole lug is completely inserted into the comb board. If there is not in place with the manual finishing, and then put on the positive and negative pole ear between the file, bridge column, pole column.

3. Turn on the acetylene and oxygen of the welding gun and ignite it to the appropriate size. Move the welding gun and the electrode to the pole lug position, then melt the lead rod and the pole lug, after the bus bar is basically welded, weld the pole pole and the bus bar together. In the process of welding, if there are impurities such as lead ash, it will find out the false welding, false welding, pole column and bus welding is the key process in the production process, to make sure that the welding is firm, no false welding, false welding. At this time, it is necessary to remove impurities while welding, and finally fill the bus.

4. After soldering the bus bar, check if there are no defects and then install the slot in the process. In general, load the cluster with terminals first and then install other clusters.

The bottom part must be installed when the plate is installed in the slot, and then the bridge column is tested to see whether it is normal. If the displacement is handled by hand, whether the upper cover can cover the bottom slot of the basic cluster has been completed.

5. How to check the pole group? First of all, let's use a multimeter to measure whether there is a short circuit in the battery. Check that there is no short circuit in the case of the multimeter is connected to the positive and negative is not a negative voltage display is not negative, if there is, prove that the polarity of the reverse, and then reload the battery slot.

6. No fault is detected by the electrode plate to enter the bridge welding, and pole group welding is a key item. Welding clamp column with bridge, welding bridge column with oxygen. During welding, the flame shall not burn to the battery housing, and there shall be no spurial welding, spurial welding, pole pole breaking away from the cluster, so that the cover can be closed smoothly. Battery cover is sealed with epoxy resin adhesive and curing agent at a ratio of 2:1. The prepared glue should be used in time to avoid long time solidification. The solidification of the colloid has a great relationship with the temperature. The higher the temperature, the faster the solidification. There is heating equipment for sealing.

7. Pole pole welding shall be carried out after the battery cover is completed. Check whether the pole pole is in the middle position of the outlet hole. The pole pole is then welded with oxygen to melt the pole pole. There is a welding, put the terminal on the pole of the lead, the position should be put, with a soldering iron melting solder wire, the terminal, pole welding together. Pay attention to the false welding, false welding.

, electrolyte configuration

The electrolyte of lead battery is made of pure water and concentrated sulfuric acid

1.280 + / - 0.005 g/cm3 ((25 ℃).

Coty electrolyte

Coty electrolyte

Preparation of electrolyte container, must be acid and temperature resistant glazed ceramics, glass tank, plastic trough or lead lined wood trough, preparation, staff must wear protective appliances;

Wash the vessels thoroughly before preparation and wash them with pure water;

When preparing the electrolyte, put the needed pure water into the container first, then slowly inject concentrated sulfuric acid into the pure water, and keep stirring. It is forbidden to inject water into sulfuric acid to avoid splash burns.

The conversion formula is d25=dt+0.0007(t-25).

D25:25 ℃ electrolyte concentration dt: temperature t when the electrolyte concentration

Temperature coefficient t: measured electrolyte concentration

1. The electrolyte is mainly composed of distilled water and sulfuric acid. The container must be acid-resistant and clean when configured.

2. Staff should have safety awareness and wear acid-proof gloves and clothes when working. If sulfuric acid is splashed on the skin during operation, wash the skin repeatedly with clean water. Pour distilled water into a clean container before slowly introducing concentrated sulfuric acid and stirring with an acid-resistant tool. If temperature is too high to stop adding acid to prevent the temperature too high acidity spatter, under the condition of the temperature of 25 ℃ to match to 1.1:28. Do not pour water into acid during preparation.

3. According to the added acid battery capacity, battery shell capacity, add acid density, charging and discharging in the group loss to calculate the amount of acid, because the charging and discharging group is no longer pumping acid.

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