Repair methods of colloidal lead-acid batteries
Colloid is a new generation of valve-controlled sealed batteries, which has been sealed well at the time of leaving the factory. It is not easy to add electrolyte by itself! If it is added, it will not form colloid, so the electrolyte will leak in use! Battery repairs should not fix it properly. Battery repairing instrument should aim at the problem of battery capacity decline caused by irreversible sulfation of negative electrodes caused by overcharging or overdischarging in use. When repairing, the concentration of electrolyte is lowered first, and the smaller current is used for charging and discharging, then charging and discharging. After several repetitions, the concentration and height of the electrolyte are readjusted after the proper capacity is reached. Colloidal battery electrolyte is in colloid, which is not easy to lower its concentration.
1, charging method: generally sulfide lighter battery, can be restored by normal charging. Generally speaking, the larger the discharge current, the shorter the battery life; The deeper the discharge, the shorter the battery life. In theory, the battery should be used to avoid deep discharge, should do shallow discharge frequently charge.
2, hydrotherapy: the vulcanization of the heavier battery, "hydrotherapy" charge and discharge.
(1) dilute sulfuric acid electrolyte with a density of about 1.050 was prepared by adding 0.5ml of distilled water in a 500ml drip bottle used for hospital intravenous drip and adding 0.5ml of pure concentrated sulfuric acid.
(2) to pry open the battery cover (must be careful to avoid damaging), spin order control valve (or take off the rubber cover), battery on adding the mixed electrolyte of 1.050 5 ml and 15 ml, preferably after injecting electrolyte battery placed more than 10 hours, the supplementary liquid penetration into the screen to see a liquid electrolyte just appear (in vertical flashlight on perforation to see more clearly) or the battery turn 90 degrees, make holes for profile, excessive electrolyte overflow, then turn back).
(3) connect the battery and the tester, press the "battery repair" function button of the tester for repair. The tester automatically enters the 3-6 hour desulfurization repair, and after the 3-hour desulfurization time, it automatically turns into the working mode "3", namely charging -- discharging -- charging. The charging current is 3A, and the discharge current is 5A. The tester automatically displays the discharge capacity and time, which is very intuitive. Record the capacity each time and repeat three or four times until the capacity stops rising.
3. Parallel battery shunt method: if the battery temperature rises rapidly in the repair process, the charge and discharge current should be reduced. At this time, the two batteries in parallel can be connected to the circuit of a tester, and the charge and discharge current is 1/2 of the original (ignoring the difference in internal resistance), and the effect is also very good.
4. Battery series repair method: when the nominal voltage of a single battery is lower than 12V, this method is adopted. For example, 6V4AH and 6V7AH batteries are often used for rechargeable emergency lamps in the market, while the single-circuit output of the tester is 12V.
5. Output combined charging and current increasing method: if the repaired battery has a large capacity, such as 100AH battery for some cars, sometimes it is necessary to increase the charging current. At this time, two or more output terminals of the tester can be connected in parallel to the repaired battery at the same time to enhance the charging current.
Colloidal battery is a new generation of valve-controlled sealed battery, which has been sealed when leaving the factory. It is not easy to add electrolyte by yourself! If added, it will not form colloid, so the electrolyte will leak in use!
The battery repairer shouldn't be able to fix it. The battery repair instrument should be aimed at the battery capacity decrease caused by the negative irreversible sulfuric acid caused by over charge or over discharge in the use process. When repairing, firstly turn down the electrolyte concentration, then charge and discharge with a small current, and then charge and discharge. After several repetitions, the concentration and height of the electrolyte are readjusting when the required capacity is reached.
Colloid cell electrolyte is in the colloid, it is not easy to lower its concentration. It cannot be fixed!
Individual proposal you see the battery is in guarantee limits not, can look for those who sell a battery to ask to be able to change!
Electric vehicle battery is barren solution battery, gel battery electrolyte within the mushy, internal electrolyte are invisible, electrolyte were adsorption to partition, if you want to completely replace the electrolyte is difficult, mainly is what reason to need to replace the electrolyte, because of the poor liquid battery electrolyte is of very high purity, than buy or outside themselves with higher purity. Electric electrolyte proportion is usually 1.30 1.34 of dilute sulphuric acid capacity, want to match, the proportion of dilute sulfuric acid while measuring line, join after a full charge proportion generally at about 1.37 battery repair is feasible according to the battery itself, as the case may be, for the battery damage is divided into a lot of kinds, damage of hardware and software damage or life end etc a variety of reasons, most batteries are on the market can repair, the part of the battery can also repair after repair can achieve an ideal state. To understand exactly how to fix it and to understand its failure mode:
1. Failure mode of lead-acid battery
Due to the type of plate, manufacturing conditions, the use of different methods, ultimately lead to different reasons for battery failure. To sum up, the failure of lead-acid battery has the following conditions:
1. Corrosion variation of positive plate
At present, there are three types of alloys used in production: traditional lead-antimony alloys, and the content of antimony is between 4% and 7%. Low antimony or ultra-low antimony alloy, the content of antimony in 2% mass fraction or less than 1% mass fraction, containing tin, copper, cadmium, sulfur and other variable crystal agent; Lead-calcium series is actually lead-calcium-tin-aluminum quaternary alloy, the content of calcium is 0.06%-0.1% mass fraction. The positive electrode grid cast by the above alloy will be oxidized into lead sulfate and lead dioxide during the charging process of the battery, which will eventually lead to the loss of the supporting active material and the battery failure. Or because of the formation of lead dioxide corrosion layer, lead alloy stress, make the grid grow deformation, the deformation of more than 4% will make the whole plate destroyed, the active material and the grid bad contact and fall off, or in the bus bar short circuit.
2, positive plate active material shedding, softening.
In addition to the active material falling off due to the growth of the grid, with the repeated charging and discharging, the binding between the lead dioxide particles also relaxes and softs, and falls off from the grid. A series of factors, such as the manufacture of the gate, the tightness of the assembly and the condition of charge and discharge, have an effect on the softening and peeling of the active material of positive electrode plate.
3. Irreversible sulfation
When the battery is over discharged and stored in the state of discharge for a long time, its negative pole will form a kind of rough, difficult to accept the charge of lead sulfate crystal, this phenomenon is called irreversible sulfudation. Slight irreversible sulfudation can be restored by some means. In severe cases, the electrode fails and cannot be charged.
4. Premature loss of capacity
When low - antimony or lead - calcium grid alloy, in the early use of the battery (about 20 cycles) a sudden drop in capacity, so that the battery failure.
5. Serious accumulation of antimony in active substances
The antimony on the positive electrode grid is transferred to the surface of the active material on the negative electrode plate in part along with the cycle. Because the overpotential reduced by H+ on antimony is about 200mV lower than that reduced by lead, the charging voltage decreases when antimony accumulates, and most of the current is used for water decomposition, so the battery fails to charge normally. The content of antimony in the negative active material of lead acid battery with charging voltage of only 2.30v was tested, and it was found that the content of antimony in the surface layer of the negative active material was 0.12%-0.19%. For some batteries, such as those used in submarines, there is a limit to the amount of hydrogen that can be produced. The average content of antimony in the active material of the negative electrode of the battery exceeded the standard for hydrogen extraction was up to 0.4%.
6. Thermal failure
For low-maintenance batteries, the charging voltage shall not exceed 2.4v in a single grid. In practical use, for example, in the car, the voltage regulating device may be out of control, the charging voltage is too high, thus the charging current is too large, and the heat generated will increase the temperature of the battery electrolyte, resulting in a drop in the internal resistance of the battery; The drop in internal resistance strengthens the charging current. The temperature rise of the battery and the current are too large to strengthen each other, eventually uncontrollable, so that the battery deformation, cracking and failure. Although runaway heat is not a frequent failure mode for lead-acid batteries, it is not uncommon. The phenomenon of high charging voltage and hot battery should be paid attention to when using.
7. Corrosion of anode bus
Generally, there is no corrosion problem in negative plate grid and bus bar. However, in valve-controlled sealed battery, when the oxygen cycle is established, the upper space of the battery is basically filled with oxygen, and the bus bar is more or less the electrolyte in the diaphragm climbing up the pole ear to the bus bar. The alloy of the bus bar will be oxidized and further lead sulfate will be formed. If the alloy of the bus bar is selected improperly, the bus bar will have slag inclusion and crevice, and the corrosion will deepen along these crevice, causing the pole lug to detach from the bus and the negative plate to fail.
8, diaphragm perforation causes short circuit
Individual varieties of diaphragm, such as PP (polypropylene) diaphragm, the pore size is large, and in the use of PP fuse wire will occur displacement, resulting in a large hole, the active material can be charged and discharged in the process through the large hole, causing a micro short circuit, the battery failure.
