National key research and development program of "new energy vehicles" key project 2016 annual project "high energy-power lithium-ion battery development and industrialization of technology research" in high nickel cathode material research and development made a breakthrough. In the first stage, the project R & D team solved the technical problem of low specific discharge capacity and low initial efficiency of high-nickel materials by combining basic formulation experiments. Combined with precursor controlled crystallization synthesis technology, secondary solid-phase synthesis technology with oxygen-enriched atmosphere and formulation adjustment , Coating technology and other key technologies to improve the oxidation of Ni2 + to Ni3 +, reduce the contact between the surface of the material and the electrolyte and reduce the amount of residual Li on the surface of the material. Without increasing the Ni content, the initial discharge capacity of the high- ≥206mAh / g, the first effect ≥90%, tap density ≥2.1g / cm3, magnetic impurity content ≤40ppb, pH≤11.7, with a 20t / month pilot production line. In the meantime, in view of the technical difficulties of the continuous gradient preparation of Ni, Co, Mn and the poor uniformity control of the three precursors, the project team used Ni, Co and Mn three solutions to prepare separately and precisely controlled the flow through the design program Into the reactor new ideas, design, production of 100 liters experimental device, the preparation of complete control procedures, the preparation process parameters are optimized to achieve the precursors of the three elements from the core to the shell by any curve continuous gradient distribution, which greatly reduced Due to the sudden change in the composition of the material in the volume effect, stress and other aspects of non-uniformity, reduce the particles in the charge and discharge microcracks, improve capacity retention. The method simultaneously improves batch homogeneity of the precursor, and the synthesized precursor is a secondary spherical structure, and the particle size and composition gradient distribution are controllable, and the tap density is higher than 1.8g / cm3. The above results provide a good foundation for the development of high-capacity, long-life gradient high-nickel cathode materials for the composition and gradient design of high-nickel ternary materials.
Hydraulic
Mount:
widely used in the suspension is divided
into three categories,like traditional suspension of pure rubber mount,or
Rubber Absorber, as well as Hydraulic Mount or Hydraulic Suspension of better dynamic
and static performance.
The shape of rubber parts is not
restricted, the stiffness can be chosen freely in a certain range, with spatial
spring characteristic, load can withstand multiple directions; using friction
damping, can absorb vibration and impact energy is good; and easy to bond metal
firmly together, greatly simplified and fixed the supporting structure, so that
the overall quality of the suspension reduced; structure has the advantages of
simple process, low cost, suitable for mass production; convenient use and
maintenance. Because of these advantages, the rubber mounting has widely used
in most of the cars.
Structure:
Pure rubber suspension consists of rubber
bushing (or other sulfide pieces) and the bracket, and the hydraulic mount is
apart from the main rubber spring, but also the internal filling the special
liquid (usually ethylene glycol), the runner plate, decoupling piece, composed
of cups and other parts to a certain structure.
Performance
requirement:
(1) Good vibration isolation performance,
soft requirement in vertical direction;
(2) Larger lateral rigidity and stability
of supporting body;
(3) Good durability.
How
to design and select good auto suspension:
In the structural design of body mounting
device location settings, select the number of points of suspension, determine
the characteristics of suspension form and elastic rubber pad, we should
consider the following aspects:
(1) The vehicle structure stiffness
distribution relationship between the frame and the body and the stiffness of
the transfer;
(2) Frame and body assembly connection
position accuracy;
(3) The stability of the vibration
isolation effect and the exercise of the body;
(4) The frame vibration and vibration;
(5) Suspension rubber pad device in the
stress condition and durability;
(6) Stress of the frame.
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