Take lithium iron phosphate batteries as an example:
High capacity batteries refer to high AH capacity, suitable for situations where the discharge current is not large and the duration of Use is long, like electric vehicles. .Wei can do better at the national level. The God of Strength is also good.
High power battery refers to high discharge rate, suitable for short-term large current discharge, such as 10C, 30C or even 50C discharge, such as 12V4.6AH battery, 20C discharge, short time discharge such as 10 seconds discharge current around 100AH. Used in vehicle starting, power tools, etc. For high-power batteries, the A123 is currently the best.
High temperature electric batteries can be used when the ambient temperature is relatively high and have little impact on thebattery life. Currently, the recommended operating temperature for lithium iron phosphate batteries is around 60 degrees. . In order to adapt to high temperature environments, special high temperature electrolytes need to be configured, and the ambient temperature can be used up to about 80 degrees. Higher temperatures require the use of primary batteries such as lithium/thionyl chloride batteries.
How to distinguish the power type and energy type of a power lithium ion battery
The power type lithium battery has the following differences Compared with ordinary lithium batteries:
1. Different properties.
Power lithium batteries refer to batteries that provide power to transportation vehicles, usually compared to small batteries that provide power to electronic devicesportable ics; Ordinary lithium batteries are batteries made of lithium metal or lithium alloys that use. Non-aqueous electrolyte solutions as negative electrode materials are different from rechargeable batteries, lithium-ion batteries and polymer lithium-ion batteries.
2. Battery capacity is different.
When all batteries are new, use a discharge meter to test battery capacity. Generally, the capacity of lithium batteries is about 1000-1500 mAh, while the capacity of ordinary lithium batteries is more than 2000 mAh, and some. can reach 3400 mAh.
3. The discharge power is different.
A lithium battery with a power of 4200 mAh can discharge in just a few minutes, but ordinary lithium batteries cannot do this at all. Therefore, the discharge capacity of the batteries atOrdinary lithium batteries cannot be compared with that of lithium batteries in power. .
The biggest difference between power lithium batteries and ordinary lithium batteries is their large discharge power and high specific energy. Since power lithium batteries are mainly used to supply energy to vehicles, they must have a higher discharge power than ordinary batteries.
Detailed information:
(1) The working voltage of a single battery can reach 3.7V, which is three times that of nickel-cadmium batteries and nickel-cadmium batteries. Hydrogen batteries, and almost twice those of lead acid batteries. This is also an important reason why batteriesLithium batteries have a high specific energy. Therefore, when forming a power battery pack with the same voltage, the number of series connections used by lithium power batteries will be much less than that of lead-acid batteries and nickel-metal hydride batteries .
(2) Light weight, with high specific energy, up to 150 Wh/Kg, i.e. 2 times that of nickel-metal hydride batteries and 4 times that of lead acid batteries. Therefore, the weight is one third to one quarter of that of lead acid batteries. acid batteries with the same energy. From this point of view, lithium batteries consume fewer resources, and since the elements used in lithium-manganate batteries are relatively large in reserves, the price of lithium batteries may further increase compared to lead and acid batteries. nickel-metal hydride. batteries, while the cost of lithium batteries will still be reduced.
(3) Small size, up to 400 Wh/L, half to a third of the volume of lead batteries. It provides design conditions, design space and possibilities for a more reasonable structure and more beautiful appearance. At this stage, due to the volume and weight limitations of lead-acid batteries, designers' design ideas are greatly limited, resulting in the structure and appearance of electric bicycles at this stage being "one size fits all". , similar and monotonous.
(4) Long service life, the number of cycles can reach 1000 times. Assuming that the capacity is maintained at 60%, the number of 100% charge and discharge cycles of the battery can reach more than 600 times, the service life can reach 3-5 years, and the service life is approx. two to three times higher. lead-acid batteries. With technological innovation and equipment improvement, battery life will become de longer and longer and profitability will become higher and higher. ?
(5) The self-discharge rate is low, less than 5% per month.
(6) The permitted operating temperature range is wide, and the low temperature performance is good. The lithium battery can work between -20℃~+55℃, which is especially suitable for low temperature use. , while the aqueous solution battery (such as lead-acid battery (Ni-MH batteries) at low temperature, the performance will be greatly reduced due to the poor fluidity of the electrolyte.
(7 ) There is no memory effect, so there is no need to discharge like nickel-cadmium batteries and nickel-metal hydride batteries before each charge, and it can be charged anytime and anywhere where. The depth of charge and discharge of the battery has little impact on the life of the battery It can be completely char.old and completely discharged. Our cycle test is full charge and full discharge.
Reference materials:
The accent is different. To put it simply, the ability type is a marathon runner. To have endurance, the capacity must be great. The requirements for high current discharge performance are generally not high, or even low. The type is 800 meters. Athletes want explosive power, but they also need to have endurance, otherwise, if the capacity is too small, they won't be able to run far. distance, and it definitely won't work if it's too close.