12V27A battery

　　If the life of the 12V27A battery pack is less than half of the average life of a single cell, it can be inferred that it is due to improper use of technology. The primary reason is that overcharging and over-discharging cause premature failure of the single battery.

　　Understand the key technical parameters of power lithium batteries

　　1. Working voltage

　　Open circuit = electromotive force + electrode overpotential, operating voltage = open circuit voltage + current voltage drop across the internal impedance of the battery. The induction potential is determined by the raw material level and the characteristics of the electrolyte. Overpotential is related to material specificity, concentration polarization and working conditions. Metal lithium electrode potential, 3v 12V27A battery, 4v 12V27A battery, 9v 12V27A battery 4.9v3.0v

　　2. Internal resistance

　　In the short term, the constant solid model of a rechargeable battery can be regarded as a voltage source. The internal characteristic impedance equivalent circuit is the internal resistance of the voltage source. The internal resistance size of the battery determines the application of the rechargeable battery. The internal resistance includes ohmic resistance and electrode resistance. The ohmic resistance of the battery does not change with the frequency of encouraging data, and the ohmic resistance of the battery does not change with the increase in temperature during the same battery charging cycle. The resistance of the electrode polarization resistor is reflected by the photocatalytic properties of the rechargeable battery.

　　3. Warming up

　　The temperature of a rechargeable battery is the error between the temperature and the operating temperature. Most lithium batteries are a heat release reaction during charging and discharging, and they all include internal resistance heat consumption.

　　4.Internal pressure

　　The internal operating pressure of the rechargeable battery is caused by the expansion of the standard air pressure caused by air leakage in the rechargeable battery, the standard air pressure on the universal casing and cracking.

　　5.Power

　　In electrical mechanics, wh is used to indicate that it is an energy unit, one degree is equivalent to 1kwh, and is often used in calculations of rechargeable batteries. Power lithium batteries mainly focus on output power and kinetic energy size, while power lithium batteries are easier to use immediately because the working voltage of the rechargeable battery changes, so the change in the entire line can reach half of the maximum value.

　　6.Charge

　　How much power is left in the battery, also known as the remaining power, is often taken as the ratio to the rated capacity or actual capacity, and is called the degree of charge. It is the most important parameter information in the application and is not easy to obtain.

　　7.Capacity

　　After charging, the rechargeable battery starts charging and discharging until the charging and discharging current is empty. The capacity of the rechargeable battery is related to the size of the charging current. The size of the charging current is also related to the charging cut-off voltage of the battery, so the volume of the battery includes the volume of the clock rate. The battery is usually 1 hour rate (1c) or 2 hour rate (). Rechargeable batteries cannot be fully utilized in raw materials, and the volume of rechargeable batteries is not large. After the entire charging process begins, the battery enters its life cycle. Battery life and degradation throughout the charge cycle is a two-layered problem. The main uses of batteries are dominant. The main uses of batteries are slowly rising. The main uses of batteries are not obvious. The main uses in the middle and late stages are not obvious. The attenuation coefficient of batteries is not large. It is necessary.

　　8.Output power

　　The output power of lithium batteries is three times that of lead-acid batteries and three times that of nickel-cadmium nickel-metal hydride batteries. The load of pure electric vehicle power lithium batteries is driven by a motor and is a constant power load in the short term.

　　9. Efficiency

　　The high efficiency of rechargeable batteries refers to the high charging efficiency or high charging efficiency of the battery. For pure electric vehicles, mileage is one of the most important indicators. Under the conditions of 12V27A battery power and output impedance, the energy of lithium batteries is based on energy saving. The law is transformed into two parts, one is the heat loss of the resistance, and the other is transformed into a reasonable driving force.

　　10. Service life

　　Unlike a single battery, the current life testing method of lithium batteries is unreasonable, which limits the production process of power lithium batteries. Suppliers emphasize that the operating voltage of each battery cannot exceed the required limit value, and the life of the 12V27A battery should be the minimum number of cycles of each battery. The value of lithium batteries should not exceed the average life of each battery.

　　11.Safety

　　The major safety hazards in the operation of power lithium batteries are explosions, ignitions and electric fires caused by the rechargeable batteries themselves. During the development process of pure electric vehicle products, several fire accidents occurred, which had an adverse impact on the development trend of pure electric vehicles. , according to various methods, in such security incidents, rechargeable batteries caught fire, cars were damaged, and even fire brigade was used for shooting, many companies have adopted information security measures.

　　To summarize the information content of this incomplete safety incident, the following assumptions are basically made:

　　*No fire or explosion occurred in long-term batteries in stock, nor during transportation;

　　Battery explosion occurs in the middle and late stages of battery charging or has been completed, and the equipment and methods of battery chargers are inseparable;

　　A short circuit in the external circuit can cause strong electrical isolation or ignition of the transmission line, and can also cause a fire. Generally, working voltage and current sources have this characteristic;

　　*Using group operating voltage or current limits cannot prevent battery power loss from overcharging;

　　*Overcharging the battery will cause the battery to deform, fail, ignite or even explode. Overcharging and discharging (reverse charging the battery) can damage it once;

　　Some rechargeable batteries have undergone strict electrical safety tests, such as light machine gun shooting, extrusion short circuit failure, water shower, small bubbles, etc.

　　In short, the correct use of batteries is very important.

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