1 lost water 2 vulcanization 3 imbalance 4 thermal out of control (charge)The first two, 2 accounted for 97% of the battery damage on the market.
(1) Analysis 1: Main cause of lead-acid battery is lost
The electrolytic liquid in the lead-acid battery is as precious in the human body. Once the electrolyte is lost, it means that the battery is scrapped. The electrolyte is composed of dilute sulfuric acid and water. During the charging process, it is difficult to avoid loss of water, the charging mode is different, and the loss is different. Ordinary three-stage charging mode, the loss of water during charging is more than twice the intelligent pulse mode! In addition to natural life, there is still a lossless life: single battery is overwater than 90 grams, the battery is scrapped. At normal temperature (25 ° C), the inletation of the ordinary charge is approximately 0.25 grams, while the intelligent charging pulse is 0.12 grams. At high temperatures (35 ° C), the water loss of the ordinary charger was 0.5 grams, while the intelligent charge pulse was 0.23 grams. According to this calculation, the ordinary charger is dried after 250 cycles, and the new three-stage pulse will be charged after 600 cycles. Therefore, the intelligent pulse can extend the life of more than double the battery.
The maximum problem in the charging process is to be paid.
According to American scientists (j.a.mas) research on the causes and regularities of lead-acid battery charging process, the lead-acid battery can accept the charging current as follows:
The formula of the critical abnormal gas curve is: i = I0E-AT% h ^ 2
During the charging process, the charging current exceeds the part of the critical inflatable gas curve, can only result in the battery electrolyte water to generate gas and temperature rise, and cannot improve the capacity of the battery.
1 The constant current charging stage, the charging current remains constant, the increase in electricity increases, and the voltage rises;
2 Constant voltage charging stage, the charging voltage remains constant, the charge is charged continues to increase, and the charging current is lowered;
3 The battery is full, the current drops below the floating conversion current, the charging voltage is reduced to the floating charge voltage;
4 Floating charging stage, the charging voltage is maintained as a floating voltage;
The first stage of the ordinary three-stage charging is constant current charging, which is mainly convenient to the circuit design, not for the best performance of the battery.
According to the lead-on process of lead-acid battery, the normal three-stage charging process is: the period of constant current charging segment and the constant pressure charging period, the current exceeds the critical inflation, causing the battery to decline in life.
Currents that exceed the critical depth gas range only generate gas and temperature rise, which is not converted to battery power, and the charging efficiency is also reduced.
Solve 1: Pulse to solve the problem of downtime
The time of the intelligent pulse is always shortened than the normal charger constant current + constant pressure stage, and this hour's high pressure segment is charged is a critical moment of water dispersion. The intelligent pulse is based on the voltage parameter. The light enters the intelligent pulse is very accurate, and the ordinary charger is based on the current parameters, once the battery is vulcanized, the internal resistance is increased, the charging current is also increased, it is difficult to reach the light Current, it is easy to cause high pressure segments to charge for a long time, accelerate hydrolysis.
(2) Analysis 2: Reasons for lead-acid batteries
Long-term retention of the battery, long-term overcharge and under charge during charging, the use of large current discharges during the use, which is easy to cause vulcanization of the battery. Its appearance is: one put it, full of charge, let's call it the "false damage" of the battery. The sulfide sulfate is adhered to the plate, which reduces the reaction area of the electrolyte and the plate, so that the battery capacity is rapidly attenuated. Dwelling will increase the vulcanization of the battery; vulcanization will increase the loss of the battery and can form a vicious circle.
Solve 2: Intelligent pulse solves the vulcanization solution
The intelligent pulse uses the spike pulse in the intelligent pulse, and the crystal nuclear nuclear nuclear crystallization in the intelligent pulse can be combined to form sulfate.
Intelligent pulse charger: 1 constant power, 2 intelligent pulse, 3 drop
Ordinary three sections: 1 constant current, 2 constant pressure, 3 floating charge
(3) Analysis 3: League of lead acid batteries
A set of batteries consists of three to four. Due to manufacturing process problems, the absolute balance of each battery cannot be achieved, and the ordinary charger uses average current to make a single battery with a small capacity first full, and when it is overcharged, this is only a small battery. End, and it is excessive. For a long time, the vicious circle makes the whole set of batteries only backwards, making the entire set of batteries. The floating stages of the three-stage charger have 500mA small current, and its role is to compensate for charging, so that the battery is filled. However, it also brings two side effects: 1, after full, excess current does not turn off, electrical energy conversion to thermal energy, perform water decomposition, accelerate the distribution of water; 2, small current charging, generated current bifurcated It is more likely to cause imbalance in the battery pack.
Solution 3: Intelligent pulse solves battery pack imbalance schemes
The loss of the intelligent pulse is one-third of the ordinary charger. There is little water loss, and the battery pack is small; in turn, the amount of water is large, and the battery pack is high. As the water loss increases, vulcanization will also be aggravated, and the ordinary charger does not remove the vulcanization function, so the battery pack is seriously imbalanced. When the intelligent pulse is charged, the water loss is small, the battery pack voltage is also small, and after the battery produces vulcanization, it can be removed by pulse, so that the entire set of batteries will be balanced. The intelligent pulse constant power phase is large, and the effect is: 1, fast charging, saving charging time; 2, activate the battery pole, eliminate battery passivation phenomena, restore battery capacity, so that the capacity of the battery is balanced. During the additional stage, it can eliminate the influence of the current bifurcation. It is charged with the under charge, which is automatically turned off, reducing water decomposition, and maintains the balance of the battery pack.
(4) Analysis 4: Thermal Loss of Lead Acid Battery
The battery deformation is not burst, and it is often a process. The battery is charged to 80% of the charge to the capacity, and the left and right enters the high voltage charging zone. At this time, oxygen is precipitated in the positive electrode plate, and the oxygen is reached through the hole in the separator, and oxygen residual reaction is performed on the negative electrode plate: 2Pb + O2 (Oxygen) = 2PBO + Q (heat); PBO + H2SO4 = PBSO4 + H2O + Q (heat). When the reaction is reacted, when the charging capacity reaches 90%, the rate of oxygen increases, and the negative electrode begins to generate hydrogen. The increase in the large amount of gas makes the battery internal pressure exceeds the valve pressure, the safety valve opens, the gas is escorted, and finally the performance is water. 2H2O = 2H2 ↑ + O2 ↑. As the number of battery cycles increases, the moisture is gradually decreasing, and the battery is as follows:
(1) The oxygen "channel" becomes smooth, and the oxidation generated by the positive electrode is easy to pass through "channel" to the negative electrode;
(2) The heat capacity is reduced, and the heat capacity in the battery is water, water loss, the battery heat capacity is greatly reduced, and the heat generated is raised soon the battery temperature is rapid;
(3) Due to the contraction of ultrafine glass fiber separators in the battery after loss of water, it is deteriorated with the adhesion of the positive and negative plate, and the internal resistance increases, and the heat is increased during charge and discharge. After the above process, the heat generated inside the battery can only pass through the battery trough, such as less heat dissipation, that is, the temperature rise occurs. The temperature increases, so that the electric storage gas is lowered, the quantity is increased, and the positive electrode is oxidized through "channel", and a large amount of heat is reacted, and the temperature is rapidly rising, and the so-called "thermal out of control is formed." ". Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
