Generally, the temperature limit of mobile phone lithium batteries is 40 degrees Celsius, 40-60 degrees Celsius. If the time is not too long, there will be no problem. Lithium batteries can also be specially customized to withstand high temperatures, and their high temperature performance will be much better.
The temperature limit set for cell phone lithium batteries is generally 40 to 60 degrees. Batteries are generally marked with explosion-proof valves, and high temperature resistant lithium batteries can withstand temperatures of up to 800 degrees. Generally, lithium batteries are tested to withstand high temperatures of 200 degrees, 500 degrees and 800 degrees, but they are generally not exposed to such high temperatures in daily life.
For lithium batteries, there is nocurrently no clear theory in the industry to support the inevitable relationship between internal resistance, discharge platform, life, capacity, etc. under various temperature performance. Calculation formulas and relevant mathematical models. are still under study. Generally speaking, lithium batteries are not sensitive to temperatures between 0 and 40°C. However, once the temperature exceeds this range, the lifespan and capacity will be compromised.
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1. First of all, there is no obvious ability. Batteries that do not have a clearly marked capacity (1000 mAh or 1000 mAh hours) may contain lower quality or recycled batteries. Many cheap batteries on the market are made from batteriesrecycled. Although these batteries are cheap, they have a short lifespan and unstable quality.
2. Standby time is not guaranteed. Standby time refers to the duration of continuous use between installing the battery in the phone and the next charge. Generally speaking, the batteries sold in the market cannot guarantee standby time to customers because the battery quality is unstable. Many cheap batteries use poor quality battery cores, so the standby time is very short.
3. Whether a safety protection circuit board is installed. Without a protected circuit board, lithium batteries risk deforming, leaking and exploding. The market is flooded with exploding lithium-ion batteries, with companies seeking cheaper protective panels or abandoning them in the face of price competition. Consumers cannot discern protectiontion of the panel from its appearance.
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What is the optimal operating temperature of a lithium battery in degrees Celsius?
Pacific Automotive Network's lithium iron phosphate batteries are greatly affected by temperature, and thermal management of the battery is necessary to improve its efficiency. The discharge capacity of lithium iron phosphate battery at a temperature of 0 ~ -20°C is equivalent to 88.05% of the discharge capacity at a temperature of 25°C.65.52% and 38.88%; the average discharge voltage is 3.134, 2.963 V and 2.788 V, respectively. The average discharge voltage at 20 °C is 0.431 V lower than that at 25 °C.
Low temperatures impact the positive and negative electrodes, electrolytes and adhesives of lithium iron p batteriesphosphate. For example, the positive electrode of the lithium iron phosphate battery itself has relatively low electronic conductivity and is prone to polarization in low temperature environments, thereby reducing the battery capacity. Affected by low temperature, the insertion speed of graphite lithium is reduced and metal lithium. is easily precipitated on the surface of the negative electrode. If left for a long time after charging. When put into use when insufficient, the lithium metal cannot be fully integrated back into the graphite and part of the lithium metal. continues to exist on the surface of the negative electrode, which is very likely to form lithium dendrites and affect the safety of the battery.
At low temperatures, the viscosity of the electrolyte will increase and the resistance to lithium ion migration will also increase; moreover, in thehe lithium iron phosphate battery production process, adhesive is also a very critical factor; This will also have a greater impact on the performance of the adhesive. In addition, when lithium iron phosphate batteries are charged at low temperatures, lithium ions may not have enough time to embed in the negative graphite electrode, thereby precipitating on the surface of the negative electrode to form lithium metal dendrites. This reaction will consume. lithium ions in the battery can be repeatedly charged and discharged, and greatly reducing the battery capacity, precipitated lithium metal dendrites can also pierce the separator, thereby affecting safety performance.
The low temperature characteristics of lithium iron phosphate batteries are determined by the characteristics of their materials and are difficult to change. I haveI did many experiments and found that the low temperature performance of lithium batteries of different materials is also different. The most popular lithium iron phosphate now has the worst low temperature performance. The discharge capacity of the product at -10°C is 89%. of maximum capacity, which should be the best in the industry. Relatively high; the release capacity can reach 95% at 55°C, and the attenuation at relatively low temperatures is relatively small.
For lithium iron phosphate batteries, excessive discharge and overcharge will damage the battery capacity. The correct way to use lithium batteries is to charge them when the energy is not full, avoid recharging when the energy is exhausted, and avoid overcharging. The optimal operating temperature of lithium batteries is 0 to 35 degrees Celsius. Environments to bHigh temperatures will reduce the activity of lithium ions, weaken the discharge capacity of the battery and shorten its useful life. If the lithium battery stays in a low temperature environment for a short time, this damage is only temporary and will not damage the battery capacity. When the temperature increases, performance resumes.
However, if the lithium iron phosphate battery is used, charged and discharged in a low temperature environment for a long time, lithium metal will precipitate on the surface of the battery anode. This process is irreversible and will cause precipitation. permanent damage to battery capacity.
The above concerns the impact of temperature on the performance of lithium iron phosphate batteries. When lithium batteries are charged at low temperatures, a certain and unacceptable danger is the deposition of elements atlithium, which damage the lifespan and service life. increases the risk of thermal runaway.
(Images/Text/Photos: Pacific Automotive Network Q&A)
Conventional lithium battery operating temperature:< /strong>< /p> -20℃~60℃, but generally below 0℃, the performance of the lithium battery will decrease, and the discharge capacity will be corresponding. It should be lowered, so the Working temperature of lithium battery at full performance is generally 0-40℃. The temperatures of lithium batteries required by some special environments vary, and some can even operate normally in environments of hundreds of degrees Celsius. Things to note when using lithium batteries: The battery will enter a dormant state after being left for a period of time. At this point, the capacity is lower than normal. The value and duration of use are also shortened. However, lithium batteries are easy to activate. After 3-5 normal charge and discharge cycles, the battery can be activated and restored to its normal capacity. The lifespan of lithium batteries is only two to three years, and lithium batteries can generally be charged and discharged 300 to 500 times. Lithium metal batteries generally use manganese dioxide as the positive electrode material, lithium metal or its metal alloy as the negative electrode material, and use non-aqueous electrolyte solution. The above content refers to lithium battery from Baidu encyclopedia