Nickel Hydride Batteries

　　What damage does high and low temperatures do to lithium batteries?

　　Damage to lithium batteries caused by high temperature:

　　As the temperature drops, the electrode reaction rate also drops. Assuming that the battery voltage remains unchanged, the charge and discharge current decreases, and the rechargeable battery power also decreases. From the perspective of various environmental factors, temperature has a greater impact on the charging performance of rechargeable batteries. The electrolyte level and the electrochemical corrosion of the Nickel Hydride Batteries electrolyte page are closely related to the working temperature. The Nickel Hydride Batteries electrolyte level is considered to be a charging Battery Cardiovascular. On the contrary, the temperature increases, that is, the power of lithium polymer Nickel Hydride Batteries increases. In addition, temperature will also affect the transportation speed of Nickel Hydride Batteries electrolyte. The temperature rise will accelerate, the transportation temperature will decrease, the transportation speed will slow down, and it will also affect the charging characteristics of lithium batteries. However, high temperatures exceeding 45°C will destroy the chemical reaction balance inside the rechargeable battery and cause adverse reactions.

　　Damage to lithium batteries at low temperatures:

　　When used for a short period of time in a low-temperature environment, or when the temperature is not low enough, lithium batteries can only temporarily affect battery power, but will not cause permanent damage. However, long-term use in a low-temperature environment, or use in a low-temperature environment of -40°C, may cause the Nickel Hydride Batteries to "freeze" and cause permanent damage.

　　In addition, when lithium batteries are charged at low temperatures, metallic lithium will be dissolved in the anodized surface of the battery, and this process is irreversible. This will cause permanent damage to the battery and reduce the safety of the battery. Therefore, many Nickel Hydride Batteries equipment will have protection devices to prevent charging at low temperatures.

　　Effect of temperature on Nickel Hydride Batteries charging

　　In the power supply system of pure electric vehicles, temperature control is one of the most important parameters and an important factor affecting battery performance. The temperature must be indicated in all battery test systems because temperature has a great impact on battery performance. Hazards include the internal resistance, filling characteristics, charge and discharge characteristics, safety factor, service life, etc. of rechargeable batteries.

　　The average charge and discharge voltage and volume of lithium batteries decrease as the temperature decreases. Especially at around -20°C, the charge and discharge volume and average charge and discharge voltage of rechargeable batteries decrease rapidly.

　　According to electrochemical analysis, SEI film resistors and aqueous solution resistors do not change much in the entire temperature range, and have less harm to the low-temperature characteristics of rechargeable batteries; while charge transfer resistors change greatly in the entire temperature range, and are consistent with The change in aqueous solution resistors and SEI film resistors is larger. The reason is that as the temperature decreases, the ion conductivity of the Nickel Hydride Batteries electrolyte decreases, and the SEI film resistor and the electrochemical corrosion resistor increase, thus causing ohmic polarization, concentration polarization and photovoltaic resistance at low temperatures. The improvement of catalytic polarization is mainly reflected in the charge and discharge curve of rechargeable batteries as the average operating voltage and charge and discharge volume decrease with the decrease of temperature.

　　The best Nickel Hydride Batteries usage temperature is 0 to 35°C. The specificity of lithium-ion batteries decreases under low temperature conditions, the charging and discharging capabilities of the battery become weaker, and the use time is shortened. In a short-term high-temperature environment, the damage of lithium batteries is only temporary and will not affect the battery power. The properties will be restored after temperatures warm up.

　　However, if the battery is charged in a low-temperature environment for a long time, the anodized surface of the battery will dissolve lithium metal. This process is irreversible and will cause permanent damage to the battery power. Due to the quality problems of the rechargeable battery itself, as well as its own quality problems and aging problems, the phone will automatically turn off at low temperatures. On the one hand, it is to protect the battery, and on the other hand, it is also due to the manufacturing issues of its own battery. Due to qualification and aging.

　　Summary: Due to the lower voltage platform of lithium batteries during high-temperature charging and discharging, the low-temperature charging and discharging capacity is significantly reduced. However, as the battery continues to be charged at room temperature, this damage will be automatically compensated and is a reversible damage. However, when charging low-temperature batteries, too low a temperature or too high a rate will often cause the irreversible generation of lithium dendrites and irreversible volume damage in the Nickel Hydride Batteries, thereby endangering the safety of the rechargeable battery.

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