Why do lithium batteries have four wires?

Two roots with the same color are the positive poles, and the other two are negative poles. The role is to use on the device. A cathode discharge on the equipment, and two negative poles are exposed for recharging.

Directly after 1, 4, both the highest voltage, should be the power supply is negative, there should be a label. Two other line should be terminal temperature detection, over temperature protection effect.1 + 4 -- -

Has two root is the same color is the positive, the other two is negative, his role is to use on the device is a cathode discharge on the equipment used, and two is negative is exposed to recharge!(because the battery we now have in production, I am responsible for)

\ battery production process used by all kinds of equipment. The structure of the battery shell and cover, plate, plate, bus bar, a column, the bridge protection board, terminal and other parts. The following introduction battery production equipment according to the battery production process.

Plate weighing

1.First of all to the inside of the each battery plate weighed, and plate group. 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. Battery over charge and over discharge and recharge not in time will affect the service life of the battery, however the battery capacity decline further, the small group of battery capacity decline further that the group of charging and discharging, so caused the decrease of the battery capacity quickly scrapped.

Required equipment is introduced: the weighing device, with group of short-circuit tester machine, plate, plate welding mold, plate welding tools, etc.

2.Before weighing plate processing

In front of the plate weighing to clear in the production of plate delete redundant in front, burr, superfluous active substances in paste, if not clean will cause short-circuit the battery self-discharge battery plate. Will want to use a scrub brush headphones plate on the excess impurities clean down to facilitate welding, in case of causing virtual welding, welding. To plate is uneven, to take off the serious, the plate with a hole in it, and selected.

Required equipment is introduced: brush headphones, etc.

3.How the weighing plate

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 positive plate and negative plate as small as possible, and the weight of the each group of 10 ~ 14 ah error not more than 1 g in each group, 17 ~ 20 ah error for each group of not more than 2 grams.

Required equipment is introduced: weighing device, set mold, workbench, etc.

Bag clapboard

1.Weighing plate shall be carried out in accordance with the provisions of the weight distribution group, with a good set of junior stuff plate, the material of diaphragm general microcellular rubber, glass fiber, should pay attention to the diaphragm, when package will plate in the middle of the diaphragm, if the location of the plate, on the plate in the box.

2.Are double package, with very thin plate piece together only the positive plate up, don't pack negative plate, so that we can avoid the defects caused by the monolithic diaphragm short circuit. Single chip package board, with partition for positive plate packages were not only negative plate inside the package board box, convenient and simple.

Required equipment is introduced: package board box, etc.

Lead parts selection

1.Lead a lead electrode and a column, a special mould casting. 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. To lead a around to try to ensure that no edge, if any, to be cut.

Required equipment is introduced: the welding gun, welding mold, oxygen welding tools, lead, furnace, etc.

Battery welding

1. Clusters of welding, welding across the electrodes is to use the lead to cluster together, in the column and bus-bar tools together with oxygen - acetylene.

2. Put the wrapped plate in the cluster box, box plate inserted in the cluster to comb plate, plugged in the positive, negative pole ear completely inserted comb plate. If you have inadequate tidy it up by hand, and then put article is negative between the ear file, the bridge column, column.

3. Open the torch of acetylene and oxygen and light, transferred to the appropriate size. Welding torch and the electrode moves to the position of the ear, then melt lead and ear, bus-bar basic welding, in the column and bus-bar welded together. At the time of welding is the presence of the impurities such as lead ashes, will find the false welding, welding, a column and bus-bar welding is in the key working procedure in the process of production, to do welding firmly, no empty welding, false welding. At this time to while welding to remove impurities, and finally make the bus.

Required equipment is introduced: the bus-bar mold, welding torch, cluster box, etc.4. Good welding after the bus, no defect and then enter the tank process, generally need to load with terminal clusters, in other clusters, after is negative electrode arrangement for + -, +, -, +, -, +, -, +, -, +, - series, don't put the wrong polarity.

When plate loaded tank must be installed to the bottom, and then in the detection of bridge columns is normal, as if there were the shift to manually handle, whether in the test and cover can cover the basic cluster tank has been completed.

5. A group of how to check that, first of all, let's have short circuit with multimeter measure batteries, if measured voltage is zero or near zero to prove that the battery short circuit, check the cluster to find the location of the short circuit for repair. Check without short circuit multimeter is the cathode is connected according to the voltage does not appear negative, if any, that put wrong polarity, and then in to reload the battery slot.

6. Is entered into the bridge welding plate without fault detection, a group of welding is one of the key. Place column with bridge welding, oxygen welding bridge column. When welding flame make sure not to burn the battery shell, make sure there are no false welding, and virtual welding, a column from the cluster, can smoothly. Battery sealing seal, with epoxy resin adhesive and curing agent with 2:1 ratio of contrast. With good glue should be used in a timely manner, in order to avoid long solidification time, colloid solidification has a great relationship with temperature, the higher the temperature of solidification of the faster, so want to use as soon as possible. Sealed cap is carried out and heating equipment.

7. The battery block to be a column after the completion of welding, testing whether a column in the derivation of the hole in the middle of the position, such as not to be revised. In the very great column die set in the derivation and use oxygen welding melting polar column on the pillars. Still have a kind of welding, the terminal on the polar column derivation, should put position is, with the soldering iron melt solder wire, terminal, a column are welded together. Should pay attention to when welding virtual welding, welding.

Required equipment is introduced: a group of moulds, multimeter, oxygen welding gun, glue guns, soldering iron, bridge welding tongs, air tightness testing machine, etc.

Configuration of the electrolyte

Lead battery electrolyte is to use pure water and the mixture of sulfuric acid, automotive battery electrolyte density of

1.280±0.005g/cm3((25℃).

(2) preparation of electrolyte container, must be acid and heat resistance of the glazed ceramic, glass, plastic or lead lining wood box, preparation, workers must wear protective equipment;

Preparation before the vessels will wash clean and pure water cleaning;

Preparation of electrolyte, should first will need pure water, into the container, then slowly into a pure water of sulfuric acid, and stir constantly, it is forbidden to pump water in sulfuric acid, lest produce splash burns.

Conversion formula is d25 = dt + 0.0007 (t - 25)

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

T: 0.0007: temperature coefficient measured concentration of electrolyte

1. The composition of the electrolyte is mainly distilled water and sulfuric acid, when in the configuration must be container is acid, and to clean.

2. Staff should have safety awareness, to wear at work acid-resistant gloves, clothes. When operating once if have sulfuric acid splash into the skin, wash immediately with water repeatedly skin. Configuration when distilled water pour into a clean container first, and then slowly in the import of sulfuric acid, with the tool of acid, and want to stir. 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.It is forbidden to add water into the acid when configuration.

Acid (3) according to the place to add the capacity of the battery capacity, battery shell, adding acid density, charge and discharge in the combination group loss, etc to calculate the acid addition amount, because after the charge and discharge with group no longer smoke acid outward.

The required equipment is introduced: distilled water machine, glass bowl, straws, optical detector, hydrometer, etc.

Injecting electrolyte

Unscrewed the vent plug, make sure you will switch on the air holes penetrate, bolt under seal and seal paper, after filling and acid to remove;

The electrolyte temperature must be cooled to below 30 ℃, insert the battery;

Will make good electrolyte injection every single cell, battery plastic shell surface and the enclosure tag "Max" flush, rubber slot battery liquid level should be above the diaphragm 10-15 mm;

Tighten vent plug, in order to prevent the leakage of acid.

Required equipment is introduced: the code machine, heat sealing machine, filling machine, smoke acid, etc.

Production equipment classification editor

According to the degree of automation of battery production equipment, battery production equipment can be divided into pure manual, semi-automatic production equipment, production equipment and automatic production equipment

manual

The minimum degree of automation, each working procedure need a lot of artificial to complete, lowest production, product quality cannot be guaranteed, low-end products is the battery production equipment. Mainly exist in the rural small battery processing centers.

semi-automatic

Automation have soared, important in battery production process has the machine automatically, battery improves precision and production, is the end product of battery production equipment. Suitable for medium-sized town battery manufacturers.

Fully automatic

Intelligent production equipment, all process completed by machines in battery production, simple labor workers got the liberation, the highest battery production, one of the best battery production equipment precision.6, large storage battery using production equipment manufacturer.

The page contains the contents of the machine translation.