What is the difference between a gel battery and a lead-acid battery?
The difference between lithium batteries and gel cells
① Environmental protection: The lithium battery of the solar street lamp is pollution-free; the gel battery contains heavy metal lead pollution.
② Different electrolytes: the electrolyte of lithium batteries is a non-aqueous liquid organic electrolyte; the electrolyte of colloidal batteries is a gel electrolyte.
③ Long service life: At present, ordinary lithium iron phosphate has no memory effect after 1500 recharges, and it accounts for 85% of the storage capacity after 1500 recharges; the gel battery is about 500 times, and the memory effect is obvious.
④ Safety: The safety of power lithium battery materials is different from the more mature safety of lithium batteries.
⑤ High efficiency and good performance: colloidal batteries have low self-discharge, which is conducive to long-term storage; deep discharge performance is high, which is conducive to improving the utilization rate and discharge capacity of active materials; deep discharge and overdischarge recovery capabilities are strong, and the charge acceptance ability meets national standards above 50.
⑥ The working principle is different: when a lithium battery is charged, the lithium ions generated on the positive electrode move to the negative electrode through the electrolyte. The more lithium ions that reach the negative electrode, the higher the charging capacity; when the battery is discharged, it is embedded in the negative electrode The more lithium ions move back to the positive electrode, the more lithium ions return to the positive electrode, the greater the discharge capacity. The decrease of oxygen on the negative electrode and the increase of the hydrogen overpotential of the negative electrode avoid a large amount of hydrogen evolution reaction.
Which is better, gel battery or lead-acid battery?
Lead-acid batteries include colloidal and liquid batteries. These two types of batteries are used in different regions. Gel batteries have strong cold resistance. At -15℃, their work efficiency is much higher than that of liquid batteries, and they have excellent thermal insulation performance. The temperature is very low, and gel batteries can be used.
Gel batteries belong to the development category of lead-acid batteries. The simplest method is to add a gelling agent to sulfuric acid to make the sulfuric acid electro-liquid into a colloid. The battery with a colloidal electro-liquid state is usually called a gel battery. The difference between gel batteries and traditional lead-acid batteries is not only that the electro-liquid turns into gel. In recent years, the laboratory has added a targeted coupling agent to the tablet formulation, which greatly improves the reaction utilization of the active substances in the tablet. According to non-public data, it can reach a weight ratio energy level of 70wh/kg.
The performance of the gel battery is better than the valve-regulated sealed lead-acid battery. The gel battery has stable performance, high reliability, long service life, strong adaptability to ambient temperature (high and low temperature), long-term discharge, cycle discharge, and deep discharge resistance And the advantages of high current discharge, overcharge and overdischarge resistance and self-protection.
There is a deep discharge protection mechanism inside the gel battery, and the deep discharge battery can still be connected to the load. Charging within four weeks will not damage battery performance. After charging, the rated capacity of the battery can be quickly restored without affecting the battery life. A deep discharge of a lead-acid battery will damage the battery's permanence. Once discharged, if the battery cannot be charged and recovered in a short time, the battery will be immediately scrapped. In other words, after a long time of charging, part of the battery capacity can be restored, and the battery life and reliability will be greatly reduced.
The above is the difference between lithium batteries and gel batteries. The difference between gel batteries and lead-acid batteries is even greater. The emergence of lithium battery products is the realization of the progress of the electric vehicle industry. Although lithium batteries have many advantages, current electric vehicles are mainly lead-acid batteries, mainly due to imperfect technology. In order to replace lead-acid battery technology, it must reach a matching height and improve the cost performance, in order to be accepted by more people.