The weight of the lithium-ion battery pack is one of the main challenges of electric vehicle technology. Pure electric cars must have long battery life, requiring a larger battery pack. However, larger battery packs bring greater weight, and more weight will cause an increase in the power consumption of the car. So if the battery is increased, it is also a vicious circle for pure electric cars, and it is even forvective. So now pure electric cars are looking for a balance between life and weight.
However, if there is a battery technology to be integrated into the structural components of the car, thereby do not increase the weight of the car, so that the whole body is directly turned into a large battery. Is this a revolutionary technology?
Passing through the conductive properties of carbon fibers, future electric vehicles can no longer need a heavy lithium battery.
Scientists from the Nursing University of Thatmuser, Gothenburg, Sweden, seems to have found the answer to “no quality energy storage”.
Sweden’s ideas can be traced back to the 1960 Grand Prix. BRM and Suts take the lead in the structural components of the engine and gearbox as the chassis, reducing the weight of the traditional spatial frame. If a lithium ion battery is integrated into a carbon fiber composite, a structural material that can be used for a car, then not only saves the battery space, but also reduces quality.
Traditional pure electric cars need to be loaded with a huge battery pack
Existing lithium ion batteries have carbon Anode and metal oxide anode. When the lithium ions pass through the electrolytic solution during charging and discharging, both of them can absorb lithium ions.
The Swedish research project launched in 2007 proposed a method of forming an anode using carbon fibers, an anode is made of a ferrite coated aluminum foil, and an anode is separated by a glass fiber fabric in an electrolyte mixture. The new concept replaces the foil of the anode electrode with carbon fiber, and combines it with a thinner partition, creates a rugged energy storage material, which has the stiffness of aluminum but lighter.
Early studies focus on microstructure of carbon fibers. Scientists discoverSmall fibers of crystals are low than crystal, but have good electrochemical properties to make them suitable for the anode and cathode materials. The structural carbon fiber market is more focused on high-end aircraft grade materials, but the strength is slightly reduced to the car use is not a problem.
In the body structure, it is greatly reduced by weight
despite broad prospects, this new The energy density of the material is not as good as the traditional battery. The first stage version of the energy density is 24 WH / kg (or a total battery set is 40 WH / kg), only 17% of the energy density of 64 kWh batteries of pure electric vehicles now. But a single benefit is that the weight of the car is reduced by about 460 kilograms, which may have a huge and beneficial impact on endurance mileage and performance.
The problem is that how many materials can be integrated into the structure of the car, and how to be balanced between reducing weight and reducing energy density . People who participated in the project hopped that the energy density of the two-stage version of the carbon fiber anode and the cathode can reach 75 watts per kilogram. Of course, the probability of the popularity of this technology should not be too high, after all, the carbon fiber car is still quite expensive. Materials, basically only viewed on the super-running car or a few high-priced electric vehicles. However, the lightweight characteristics of carbon fibers simultaneously discard the traditional battery, allowing the entire vehicle to reduce the weight of the body weight, and it will be more secure than using traditional lithium batteries, once technology achieves breakthrough To reduce costs, there is still a wide range of market prospects.