According to European media reports, Cambridge University researchers announced the development of a new type of lithium-ion battery, which overcomes many technical difficulties including power, price and cruising range, and is expected to replace the current vehicle-mounted lithium-ion battery.
Lithium-oxygen batteries, also known as lithium-air batteries. Scientists say that its energy density is theoretically 10 times higher than that of lithium-ion batteries currently used in electric vehicles and is close to gasoline energy, which is enough to make an electric vehicle reach several hundred kilometers.
At present, most of electric vehicles use lithium-ion batteries, and sales have been constrained by high prices and insufficient battery life. Take Nissan Leaf as an example, the cruising range is approximately 250 kilometers (150 kilometers).
The researchers said that the cost and weight of batteries used in new batteries are only one-fifth that of lithium-ion batteries, and they will effectively solve the two major problems that restrict the development of electric vehicles.
Unlike other lithium-ion batteries, researchers at the University of Cambridge switched to lithium hydroxide instead of lithium peroxide and used graphene as an electrode. The results obtained were more stable and effective. The researchers estimate that the battery can be charged and discharged more than 2,000 times, and the current charge and discharge efficiency is as high as 93%.
The research leader Claire Gelley, a professor of materials chemistry at the University of Cambridge, said that the project “although it is difficult but it is moving toward a practical batteryâ€.
However, this technology is still in the research and development stage, and it is expected that the actual finished product will be at least 10 years later. Grey said it is too early to expect large-scale production to be used in automobiles because lithium-ion batteries are still unable to stably charge and discharge.
Sectional Door Accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.
Detail introduction for above main accessories
1.Motor and controller:
The garage door operator is designed for residential overhead sectional and tilt doors.
The operator memorizes the limit positions and unique braking system that slows the unit down at the end of its travel.
Rolling code remote control with max. 20 pcs hand transmitters.
The operator is equipped with a manual release lever which allows manual operation of the door in case of power failure.
The controller has a security LOCK function which prevents operation of the door from transmitter.
2.spring break device:
Sectional doors are hinged and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs this is normally 15 percent. For example a 100 pound pull spring requires 15 pounds of weight to separate the coils; when a door is open the two springs will support 15 pounds of door weight without any stretch.
Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.
3.able break device:
cable break device ,door hardware
adjustable bottom bracket .
the raw material hot plate
zinc plated
safety device
adjustable bottom bracket
the raw material hot plate
zinc plating
spring safety device ,2" and 3" safety device
once the cable is broken ,this devoice can keep the hurt away from the door falling
4.aluminum alloy rope pulley
Equipment: CNC stamping/punching machine, CNC bending machine, CNC cutting
machine, 5~250 tons punching machines, welding machine, polish machines...
Processed material: stainless steel: copper, carbon steel
Surface treatment: Hot galvanized, polishing
Making process:Stamping, deep drawing,bending, punching, laser cutting,threading,
welding, tapping, riveting, grinding
5.air bag system
It is a safety device. When the door is down to hit something, it will up automatically.
Operation pressure:<3mbar
Battery:CR2032*2
Battery lifetime>1 year
Emission frequency: 315MHZ
Emission power:<10mW
Receiver power source:12V
6.duplex enhanced guide wheel bracket
Determining the right type of sectional door roller for your garage door tracks can be a little confusing, especially when you do not know what you need to look for in a garage door roller. To simplify things, there are two primary things you need to be aware of. First are the actual dimensions of the roller, and second is purpose that you will be using the door for. You can read below about measuring your roller and choosing the right quality of material for your door.
Other Door Accessories,Electronic Door Accessories,Automatic Door Accessories,High Speed Door Radar Detector
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfgaragedoor.com