Name of the Profile of lithium-ion battery
Is now widely used in lithium-ion battery from the development of lithium batteries. Understanding of the lithium-ion battery, we first introduce the lithium battery.
For example, before the camera with the button battery is a lithium battery. Lithium battery anode material for lithium metal cathode material for carbon materials. In accordance with the customary naming rules, we call this battery is a lithium battery.
Lithium-ion battery cathode materials for lithium cobalt oxide anode material for carbon materials. Embedded in the carbon anode materials in lithium-ion battery through the cathode and moved out of the realization of the battery charge and discharge process, in order to distinguish it from the traditional sense of the lithium battery, known as lithium-ion battery.
Extensive use of lithium-ion battery.
The development of high-tech purpose is to make it better the service of humanity. Lithium-ion batteries since its inception in 1990, with its outstanding performance has been rapid development, and is widely used in society. The incomparable advantages of lithium-ion batteries for other batteries quickly occupied many areas, like the well-known mobile phones, laptop computers, small camera, and more and more countries of the batteries used in military purposes. The application shows that the lithium-ion battery is an ideal small-scale green power.
The main components of lithium-ion battery
(1) the battery cover
(2) are a very ---- active material for lithium cobalt oxide
(3) the diaphragm ---- a special kind of composite film
(4) the negative pole ---- active substances for carbon
(5) organic electrolyte
(6) battery shell
The superior performance of the lithium-ion battery
We often say that the superiority of the lithium-ion battery for the traditional nickel-cadmium batteries (Ni / Cd) and nickel metal hydride batteries (Ni / MH) terms. Then, the lithium-ion battery what was good?
(1) a high voltage
(2) energy
(3) long cycle life
(4) low self discharge rate
(5) No memory effect
(6) non-polluting
The following is a nickel-cadmium, nickel metal hydride, lithium-ion battery performance comparison:
Technical parameters of nickel-cadmium batteries, nickel metal hydride batteries lithium ion battery
Operating voltage (V) 1.2 1.2 3.6
Weight specific energy (Wh / Kg) 50 65 105-140
Volume ratio of energy (Wh / l) 150 200 300
Charge-discharge life (times) 500 500 1000
Self-discharge rate (% / month) 25-3030-356-9
Whether the memory effect has no
Contamination Nil Nil
(Note: The charge rate of 1C)
Lithium-ion battery works
We already know that lithium-ion battery cathode materials for lithium cobalt oxide cathode is a carbon.
The lithium-ion battery working principle refers to its charging and discharging. When charging the battery, the positive terminal of the battery, lithium-ion generator, generated by lithium-ion movement through the electrolyte to the cathode. As the carbon anode was layered structure, it has a lot of micropores, reach the anode of lithium ion embedded in a porous carbon layer embedded lithium-ion is more, the higher the charge capacity.
Similarly, when the discharge of the battery (ie, we use the process of the battery), lithium-ion embedded in the cathode carbon layer prolapse, but also the movement back to the cathode. Back to the cathode of lithium-ion more higher discharge capacity. We usually refer to the battery capacity refers to the discharge capacity.
Not difficult to see during charging and discharging of the lithium-ion battery, lithium-ion in the positive → negative → positive state of motion. If we put lithium-ion battery Saying for a rocking chair, rocking chair, the two ends of the poles of the battery, lithium-ion like excellent athlete, running back and forth at both ends of the rocking chairs. So, the experts gave a lithium-ion battery is a lovely name rocking chair battery.
The assembly process of the lithium-ion battery
Lithium-ion battery technology is very strict and complex, only a brief introduction of several major processes.
(A) pulp
Dedicated solvents and adhesives, and powder mixed with positive and negative active material,
After high speed stirring well, made from a slurry of positive and negative material.
(2) coating
Made from the pulp evenly coating the surface of the metal foil, drying, respectively, made positive
The negative pole piece.
(3) assembly
Cathode film - divide - negative film - diaphragm top-down order to put away through the winding
Made the battery very core by re-injected into the electrolyte, sealing process is complete electrical
Pool assembly process, finished battery.
(4) into
Dedicated battery charging and discharging equipment on the finished battery charge and discharge test, for each
Only battery testing, screening qualified finished battery, and the factory.
The security features of the lithium-ion battery
The lithium-ion battery has been widely used in people's daily lives, so it's safety performance should definitely be the first assessment indicators of the lithium-ion battery. For lithium-ion battery safety performance assessment indicators, the international community provides for very strict standards, a qualified lithium-ion battery safety performance should meet the following conditions.
(1) short-circuit: no fire, no explosion
(2) Overcharge: No fire, no explosion
(3) hot box test: no fire, no explosion (150 ℃ thermostat 10min)
(4) acupuncture: Explosion (? 3mm nail penetration batteries)
(5) plate impact: No fire, no explosion (10kg heavy weights since 1M height pound battery)
(6) burning: No explosion (gas flame barbecue batteries)
The lithium-ion battery security features is how to achieve?
In order to ensure safe and reliable use of the lithium-ion battery, the experts were very strict, careful design of the battery safety, in order to achieve the battery safety assessment indicators.
(1) divide 135 ℃ Automatic shutdown protection
Adopts the international advanced Celgard2300PE-PP-PE three-tier composite membrane. When the battery temperature reached 120 ° C, the composite membrane on both sides of the PE film hole closed, the battery internal resistance increases, the battery internal warming mitigation, the battery temperature reached 135 ° C, PP film hole closed, the battery internal circuit, the battery is no longer warming, ensure safe and reliable battery.
(2) adding additives to the electro-hydraulic
Overcharge the battery, the battery voltage higher than 4.2v conditions, electro-hydraulic additives and other substances in the electro-hydraulic aggregate increase in battery internal resistance mate, internal battery to form a large area of ??open circuit, the battery is no longer warming.
(3) the battery cover composite structure
The battery cover using the notch explosion-proof structure, when the temperature of the battery, the battery internal activation generated in the process part of the expansion of gases, the battery internal pressure increased, the pressure reaches a certain degree of notch rupture deflated.
(4) a variety of environmental abuse trial
The abuse tests, such as external short circuit, overcharge, acupuncture, flat shock, burning, study the safety performance of the battery. Battery temperature shock test and vibration, drop, shock and other mechanical properties test, the performance of the inspection battery in actual use environment.
The lithium-ion battery is a new green battery.
"Care for the environment, protection of the Earth" is the bounden duty of every one of us. How our environmental philosophy reflected in action?
As a battery consumers should buy, the use of new green battery; as battery manufacturers, and production of new green battery. Only through our joint efforts, to create, protect our beautiful and harmonious natural environment.
The new green battery means in recent years has been put into use or are being developed for a class of high-performance, non-polluting batteries. Has been extensive use of lithium-ion batteries, nickel metal hydride batteries and are promoting the use of mercury-free alkaline manganese batteries, as well as being developed by the lithium or lithium ion plastic batteries, fuel cells, electrochemical storage supercapacitor is a new type the scope of the green cells. In addition, has been widely applied use of solar energy photovoltaic conversion of solar cells (also known as photovoltaic power generation), also fall into this category.
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