In this year's electric car 100 will be the driving force of the battery forum, we are enthusiastically discuss how to achieve those magnificent car power lithium battery targets: such as car power distribution to 80 kWh or 100 kWh, the mileage is 500 Km, such as 15 minutes charging travel 400 km, such as PACK per unit of electricity is not more than 800 yuan, 600 yuan batteries and so on.
On the one hand, the lithium manufacturers follow the OEMs, in the high-energy density, fast charge, high security road running blindly. In the subsidy policy on the energy density and mileage of stimulation, a variety of pure electric vehicle life from 150 km, 260 km, 380 km, chasing all the way high. On the other hand, at the same time, in the low-speed electric vehicles as the representative of the short-distance economy on behalf of the market, when they upgrade the product under the dual pressures and standards began to upgrade the power system, they find the right lithium system is not An easy thing.
Long driving range, fast charge is the direction of development of electric vehicles, but it must be 500 km, 600 km, 700 km so go forward? In low-speed urban conditions, if every day to get off work 30 km, the car is filled with a 300 km battery pack, this configuration makes the system energy efficiency is low, not economic.
In response to this problem, CATL founder Zeng Yuqun battery power market approach, namely: for the different needs of market segments, the introduction of different platform products -
Special right-of-way market: such as Beijing, Shanghai limit the purchase of the BEV market, the user is looking forward to completely replace the fuel vehicle, requiring a long life, fast charge and so on.
Economic market: to meet the daily short-distance travel, low-cost and basic security requirements.
Operational market: highly reliable battery, high cycle life, cost-effective, do not need fast charge.
Performance-based market: Saobao type, the pursuit of the ultimate product, such as Tesla, EP9 ultra-running and so on.
In the relevant state technical standards, low-speed electric car lithium-ionization process suddenly accelerated. This is a current production and sales of more than new energy vehicles, and have great potential to explore the market, then the current lithium battery manufacturers should be better and low-speed electric vehicle product features combine to cut into this piece of the market?
This article will be an industry typical 330 model products as an example, for analysis.
A 330 models, curb weight 849kg, equipped with six 12v100AH maintenance-free lead-acid batteries, motor power 5kw. Maintenance-free lead-acid batteries, the energy of about 34wh / kg, cost about 580 yuan / kWh.
1. Energy density selection
Lead acid version: the battery weighs about 210kg, accounting for vehicle weight ratio of 25%.
According to the 2017 subsidy policy in the battery energy density of specific requirements: pure electric passenger car power battery system mass energy density of not less than 90Wh / kg, higher than 120Wh / kg by 1.1 times to give subsidies.
In the lithium iron phosphate, the current market most of the battery system energy density levels in 70wh / kg-80wh / kg or so, 90wh / kg enterprises easy to standard, 120wh / kg to work hard. In the ternary lithium battery, 90wh / kg has been more than 120wh / kg do not much business.
A high level of energy density, battery security also increases the difficulty of guarantee. Low-speed car neither subsidies nor the pursuit of high mileage, the standard model of the weight of 800kg is also easier to achieve, 80-90wh / kg of energy density is sufficient. Cost> energy density.
Lithium version: the battery system weighs about 80kg, accounting for vehicle weight ratio of 11%.