In simple terms, the rate of lithium-ion batteries corresponds to the discharge performance under different currents. Generally speaking, the capacity released at high magnification is less. Therefore, the amount of capacity released at high rates has become an indicator of battery performance. The more capacity released at high rates, the better the battery performance.
The charge and discharge rate performance of lithium-ion batteries is directly related to the migration capacity of lithium ions in the positive and negative electrodes, electrolytes and the interface between them, all the factors that affect the speed of migration. lithium ions (these effects The factor may also be equivalent to the internal resistance of the battery), which will affect the charge and discharge rate performance of lithium-ion batteries. In addition, the heat dissipation rate insideBattery life is also an important factor affecting rate performance. If the heat dissipation rate is slow, the heat accumulated during high-rate charging and discharging cannot be transferred, which will seriously affect safety and discharging. lithium-ion battery life.
3C lithium batteries generally need to pass performance testing before they can be used. The battery test module can transmit current during performance testing of 3C lithium batteries. For example, high current shrapnel microneedle module can transmit. 50A current, overcurrent is stable without attenuation, has good connection function, and can also improve the testing efficiency of 3C lithium batteries.
What does a 70°C discharge of a lithium battery mean?
The charge and discharge rate of a lithium-ion battery determines how quickly therehow much energy can be stored in the battery. , or how quickly battery power is released.
Positive and negative electrodes and electrolyte will affect the charging and discharging performance of lithium batteries. As the number of charging and discharging of lithium batteries increases, the capacity will become smaller and smaller, which directly reflects the deterioration of lithium battery performance more and more.
The charging and discharging performance of lithium batteries is directly related to the migration capacity of lithium ions in the positive and negative electrodes, electrolytes and the interface between them, all factors that affect the speed of lithium migration. ions (these influencing factors can also be equivalent to the internal resistance of the battery), which will affect the performance of the battery charge and discharge ratelithium-ion series.
In addition, the heat dissipation rate inside the battery is also an important factor affecting the rate performance. If the heat dissipation rate is slow, the heat accumulated during high-rate charging and discharging cannot be transferred. which will seriously affect the safety of lithium battery and its longevity.
Detailed information
Generally, a conductive agent is added inside the positive active material to reduce the friction between the active materials and between the material active and the positive electrode matrix/current collector. Contact resistance, improves the conductivity (ionic and electronic conductivity) of the cathode material and improves flow performance. Conductive agents of different materials and shapes will affect the internal resistance of lithium batteries, thereby affecting their performance.
Co collectorsurant (lugs) of the positive and negative electrodes are the power transmission media between the lithium-ion battery and the outside world. The resistance value of the current collector also has a great influence on the resistance value of the current collector. rated battery performance. Therefore, the performance and service life of lithium batteries can be improved by changing the material, size, output method, connection process, etc. of the current collector.
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Battery classification lithium
70c lithium battery discharge refers tothe battery. the discharge rate reaches 70°C.
The discharge C number of the lithium battery is the discharge rate C of the battery, which is used to indicate the size of the currentcharging and discharging. C represents the symbol for the discharge rate of the lithium battery. For example, 1C represents the lithium battery's ability to discharge stably at 1 times the discharge rate. By analogy, other symbols such as 2C, 10C, 40C, etc. Lithium represents the maximum current discharge multiple that the battery can discharge stably. The charge and discharge rate of the lithium battery is equal to the charge and discharge current divided by the rated capacity of the battery. ?
Generally, we call lithium batteries discharged to 1C standard batteries, those discharged to 2C-10C low-rate batteries, and those discharged above 10C high-rate batteries. The main difference between high-rate batteries and traditional standard batteries is the difference in manufacturing processes. Standard batteries and small batteriesflow are mainly made by the pole piece winding process, while high flow batteries used for emergency starting power supply have it. internal pole pieces. The manufacturing process of rolling also indirectly provides a simple method of identification. The battery produced by the winding process will be slightly thicker on both sides and the flatness is slightly worse, while the multi-rate lithium battery produced by rolling. the process is quite flat and square. ?
Lithium battery classification: According to the practical performance of lithium batteries, they can be divided into ordinary energy storage capacity type and battery type. power flow.
Based on the practical performance of lithium batteries, they can be divided into ordinary energy storage capacity type and power flow type.The power multiplier type has the characteristics of high density and high output power. High-rate batteries are increasing in size with the advent of hybrid electric vehicles. It requires the battery to store high kinetic energy, which can be applied to the distance of pure electric vehicles. It also has good power output characteristics and enters the gasoline and electric hybrid mode in low power consumption mode.
Cylindrical batteries such as 18650 can be divided into 3C rate and 5C rate, which means that its own discharge current can reach 3 times and 5 times its own capacity. The discharge rate of high-quality 3C batteries produced by some manufacturers can even reach 5C, and those with a rate of 5C can reach 8C. The energy storage type has the characteristics of high density and large capacity and ist generally used in electrical equipment that does not require high discharge current.
Lithium battery
Lithium battery is a battery that uses lithium metal or lithium alloy as anode material and uses solution non-aqueous electrolytic. The difference between lithium batteries and lithium-ion batteries is that the former is a primary battery and the latter is a rechargeable battery. Since the chemical properties of lithium metal are very active, the processing, storage and use of lithium metal have very high environmental requirements, so lithium batteries have not been used for a long time.
With the development of microelectronic technology at the end of the 20th century, the number of miniaturized devices has increased day by day, placing high demands on power supplies that are then input.ed in a large-scale production phase. convenient use.