Car charging station manufacturers: With the continuous progress of battery technology and vehicle companies in the lightweight and other areas of development, electric vehicle range continues to improve, the range of more than 1,000km models have been unveiled one after another, electric vehicle mileage anxiety is basically alleviated, but charging is slow, charging is difficult to "make up for the energy anxiety" is still restricting the development of electric vehicles. Existing charging technology requires consumers to wait 40 minutes or even longer to fill up, holiday travel "charging an hour, queuing for four hours" has become a bone-deep pain for new energy vehicle owners, so that rapid replenishment of electricity as convenient as refuelling has become the direction of the EV industry chain's efforts.
Car charging station manufacturers: The 800V high-voltage system + super fast charging for electric vehicles can achieve a charging time of 10 minutes and a range of 300 kilometres, which can effectively solve the anxiety of replenishment, and is expected to become the mainstream route of fast charging. Domestic and foreign mainstream car companies have already made relevant layouts, and several 800V models will be mass-produced in 2022. But equipped with 800V high-voltage platform car charging in the ordinary charging pile charging, charging speed is not up to expectations, can not achieve super fast charging, thus the pile end of the industrial chain needs to be upgraded in tandem with the car end, a number of subsections of the track will benefit.
First, what is high voltage charging
Car charging station manufacturers:Fast charging is fast charging, the unit of measurement can be charged times (C). The larger the charging multiplier, the shorter the charging time.
Charging multiplier (C) = charging current (mA) / battery rated capacity (mAh)
For example, if the capacity of the battery is 4000mAh and the charging current reaches 8000mAh, the charging multiplier is 8000/4000 = 2C.
Car charging station manufacturers:High rate charging is not 0%-100% of the charge is done by high current charging. The reasonable charging mode is divided into three stages, stage 1: pre-charging state; stage 2: high current constant current charging; stage 3: constant voltage charging.
Car charging station manufacturers:Stage 1 pre-charging plays a protective role for the battery cell, stage 2 is what we call the high rate charging stage, the power range of this process is often in the 20%-80%; stage 3 constant voltage charging is aimed at limiting the voltage, preventing the battery cell from over-voltage, which can damage the battery structure.
1, Car charging station manufacturers:fast charging needs to improve the power of the charging end and the battery charge/discharge multiplier
There are two main charging methods for EVs: DC fast charging and AC slow charging.
Car charging station manufacturers:AC slow charging corresponds to the charging scene at home or community car parks, charging power is small from a few kilowatts to dozens of kilowatts, usually takes 8-10 hours to be fully charged. AC slow charging uses 220V AC power directly from the grid, and converts it to DC power through the AC/DC converter inside the on-board charger OBC to supply the EV battery. Car charging station manufacturers:Due to the lower charging power, the power of the AC/DC converter built into the on-board OBC is generally lower, and the cost is lower.
Car charging station manufacturers:DC fast charging generally corresponds to the charging scenarios on motorways/long journeys, where the power reaches hundreds of kilowatts and takes only 1-2 hours to fully charge. The essence of DC fast charging is to transfer high power AC/DC to a fast charging post, where the DC charging post converts the AC power from the grid into high power DC power through a rectifier to charge the vehicle battery directly. The peak power of fast charging can reach 350kW or even 480kW, and the super fast charging time is expected to be reduced to less than 30 minutes, and in the future it may be compressed to less than ten minutes.
Car charging station manufacturers:The charging gun of DC fast charging is the "bridge" of the DC fast charging system, which undertakes the transmission and conversion of power and information between the charger and the vehicle. HUBER+SUHNER's national standard liquid-cooled gun, the RADOX® HPC 600, is capable of achieving a continuous charging of up to 600A (up to 800A in real life), with a performance of 600kW/1000V. The RADOX® HPC 600 offers 600A continuous charging (measured up to 800A), a system performance of 600kW/1000V, a ready-to-use metering system, replaceable contacts for longer service life, higher safety with IP67 rating, and CCS1 and CCS2 interfaces. It can realise more efficient and convenient fast charging, which can maintain high charging speed, guarantee charging safety, reduce equipment weight and maintenance cost, and is a better choice for liquid-cooled supercharging facilities.
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2、Car charging station manufacturers:Improve the fast charging speed: need to improve the charging end power and battery charging/discharging multiplier at the same time.
Charging effective power is the smaller value of charging power and battery charging power, and to improve fast charging speed, it is necessary to improve charging power and battery charging/discharging rate at the same time.
Car charging station manufacturers:The charging power (formula P=UI) can be increased by increasing voltage or current. Taking Porsche as an example, Porsche Taycan is the first model to lay out the 800V high-voltage platform, and as a typical representative of high-voltage route, its peak charging power has reached 350kW.
Second, the advantages and disadvantages of high-voltage charging and the current development situatio.
Translated with www.DeepL.com/Translator (free version)
Sichuan Green Science & Technology Co., Ltd.
0086 19158819831
Post time: Jul-25-2024
