The energy density of power batteries has become a bottleneck.

The ternary lithium ion power battery now see the "ceiling" of energy density, high nickel material, silicon carbon cathode highest energy density of lithium battery monomer should be around 300 wh/kg, plus or minus of no more than 20 wh/kg.

The national "863" plans to energy saving and new energy automobile major project master XiaoChengWei expert group expert.

According to the national power battery technology roadmap planning, in 2020Lithium ion batteriesMonomer energy intensity targets for 350 wh/kg, from the point of the current power battery technology, Xiao ChengWei think it may not be able to reach a target.

Distance in 2020 and now have two years of time, can the industrialization of the next generation of power battery does not emerge.

At present, China's new energy automobile market of pure electric vehicles carrying power battery, most of the ternary lithium material and lithium iron phosphate batteries.Although compared with lead acid and nickel metal hydride batteries, the energy density have been improved greatly, but still hard to reassure consumers range anxiety.

There is no doubt that power battery technology bottleneck for a long time, hinder the process of industrialization of new energy vehicles.

So, lithium ion battery density can also improve again?

In both ternary lithium battery materials lithium iron phosphate batteries, basic it is made up of four key parts, namely the positive, negative, and electrolyte membrane.Now based on the four components of lithium battery, to improve the energy density and achieve industrialization application, is unlikely.

A new technology from the laboratory to application, often want to experience many years.

MiaoWenQuan thinks, deputy director of the Shanghai motor vehicle inspection center in 2020 is not a distant future, there is no see any identifying solutions, may achieve the above objectives of a new generation of power battery system is a handful.

Then power battery can not meet the technical route planning goals, the process of development of China's new energy vehicles will not be blocked?

Of course not!

Because affect the performance of power battery is not only better than an index, the energy density and power battery than the power density, safety, consistency, cycle life and so on many factors, among the indexes and industrialization application to find a balance between cost, is the key of the development of supporting new energy vehicles.

In addition, Japan and South Korea are the gel battery, this is a kind of no and diaphragm electrolyte battery, battery, could potentially bring qualitative change, but there is no news of industrialization.

In MiaoWenQuan view, improve power battery than the technical approach of energy has a lot of:

It is technological progress, but now the battery process design has been relatively mature, improve battery than the energy of the space is not large;

Second, the material performance of ascension, subject to their own physical and chemical properties, and ternary lithium iron phosphate as the anode, carbon materials as the cathode lithium ion power battery. It is difficult to have a big breakthrough in the energy density;

Three is new material, new system, namely the development ratio can develop new materials, new power battery system will be the future power battery than the main way to significantly enhance energy.

If you can't effectively improve battery energy density, so if we can consider from the Angle of to the battery pack weight loss of the whole to improve the energy density?

China battery industry association Zhang Min Dr Yu said the idea completely feasible.She said the power battery in the battery pack, generally between one-third and two-thirds of the weight of the batteries, for the rest of the circuit board, shell and other accessories.If that effectively reduce the weight of these parts, while maintaining the existing energy density batteries, the energy density of the battery pack as a whole will have an obvious increase.

Around 2010, power battery pack for security needs, often use a metal shell, battery pack overall energy density is very low.Later after the replacement of high polymer shell, the energy density have a greatly improved.

Battery pack energy density is a system problem, improve the energy density batteries is a direct way, but if be batteries, circuit layout, reduce the body weight, enquiring for battery, is also an effective means to improve the battery energy density.

In practical applications, the new energy automotive EV200 models of battery box frame using aluminum alloy material, under cover with composite materials, effective weight loss tens of kilograms.

Baic, deputy general manager of new energy Wang Kefeng says, by reducing the battery box overall weight, can realize the vehicle weight reduction and energy density is to improve battery box of an effective means.In addition, he says, changed generally lighter materials lead to the rising cost of batteries, now Beijing new energy stepped in to the research and application for lighter, stronger lower material cost.

Now, each big business enterprise of the battery to achieve the goal of 350 wh/kg, not only need to develop new battery, battery pack for weight loss, should be parallel.

Power battery for assembly on the car, need to pass test, under various working conditions to ensure the safety of the certain structure.Or other material to replace steel shell with carbon fibre shell of the shell, as long as you can guarantee the strength requirement, completely feasible.

In addition, the battery pack heat dissipation and soaking ability is another important index.If the battery pack and local overheating, can lead to inconsistent battery internal resistance, batteries discharge capacity drops, those who do not fully discharge batteries in a sense, is an ornament to the battery pack.

Although the battery pack 350 wh/kg, the energy density for battery weight loss alone may be unable to achieve, but power battery as a system, it cannot ignore the role of.Domestic enterprises is the lack of basic research, the excessive pursuit of high energy batteries, this is wrong, should be balanced development, in the development of new materials battery at the same time, attach importance to the existing system of battery weight loss.

The page contains the contents of the machine translation.