The future of lithium-ion batteries will be more secure
Why do lithium-ion batteries burst into flames (vgp-bps8, vgp-bps8a, vgp-bpl8 * )
At present, mobile phones, notebook computers and other equipment used in lithium-ion battery main components include: lithium cobalt oxide as active cathode material, graphite as the anode active material, organic electrolyte, polypropylene or polyethylene divide.
Lithium-ion battery safety accident occurs mainly by the electrodes and electrolyte between the chemical reaction. The main ingredients of the electrolyte carbonate, a low flash point, boiling point is low, under certain conditions, can ignite or even explode. In the charge state of battery cathode material for strong oxidizing compounds, while in the charge state of the anode material for the strong reducing compounds, such as the vgp-bps9, vgp-bps9/b, vgp-bps9/s battery to overheat, will lead to electrolyte oxidation and reduction carbonate to produce a large number of gas and more The heat, such as lack of safety valve or a gas through the safety valve to release too late, the battery will be a sharp increase in internal pressure caused by an explosion.
In addition, lithium cobalt oxide material of the theoretical specific energy of more than 270 milliamperes per gram of the time, but to ensure that their cycle performance, the actual use of the capacity is only half the theoretical capacity. The use of the process, such as the occurrence of certain accidents, such as the management system damage caused by the battery charging voltage is too high, the remaining part of the lithium anode will vgp-bps9a, vgp-bps9a/b prolapse through the electrolyte to the cathode surface in the form of lithium metal deposition, while the lithium metal of the Surface electro-deposition can easily form a "dendrite" will pierce the membrane, so that positive and negative short-circuit, causing the battery to quickly fever, caused by security incidents.
In addition, the battery overcharging, resulting in a high voltage anode to accelerate oxidation of the electrolyte, the resulting heat and gases may cause the battery thermal runaway.
The fire was mainly due to internal pressures lead to the vgp-bpl9, vgp-bps10, vgp-bps10/b battery shell after shell burst, high temperature under the electrode and electrolyte in contact with air, in a state of negative charge close to the lively nature of lithium, and oxygen exposure will immediately burn and ignite the electrolyte, separator and so on.
Specifications of the manufacturers have strict and thorough safety design
Although the battery of alarming security incidents, but we should see that in 2006 global production of more than two billion lithium ion battery cells the accident occurred only a very small number of standard battery manufacturers have strict and thorough security design.
First of all, in order to achieve vgp-bps10/s, vgp-bps10a, vgp-bps10a/b battery safety assessment indicators, need to use a qualified positive and negative materials and design to ensure excessive negative. The normal charge-discharge cases, the lithium-ion in the layered structure of the anode and cathode embedded and prolapse, vgp-bpl10 generally do not cause the destruction of crystal structure, nor the formation of dendrites pierce the diaphragm to cause internal short-circuit.
In the production process, manufacturers are even more stringent control over the consistency of a pole piece to prevent the normal charging lithium anode formed on the surface of the deposition; the same time, using a thermal shutdown feature of the battery separator, the battery temperature reached 120 ℃ circumstances, the composite membrane on both sides of the PE film hole will be closed, the battery internal resistance increases, warming will slow; also to the electrolyte by adding anti-overcharge additives, the battery voltage is higher than the set value of the condition, the occurrence of additive aggregation, a substantial increase in battery resistance, reduce heat; batteries also need safety valve, the internal pressure is greater than a certain value, the pressure relief valve can be opened and so on; In addition, the control of the manufacturing environment is also very important because the manufacturing process introduced impurities out powder and other kodak battery , kodak cr-v3 battery , kodak klic-5001 battery security problems can lead to the battery. Finally, each batch of battery cells also need to test samples for various abuse tests, such as overcharge, hot box, acupuncture, extrusion, temperature shock, external short circuit, fall and so on, to fully investigate its safety performance.
As ordinary consumers, the insurance company practice is to select well-known products, in strict accordance with the requirements of the instructions on the use of man-made in the electrical or battery is damaged or abnormal, should help manufacturers to service personnel, rather than use their own makeshift repairs or demolition of . It can be said to master the relevant knowledge and rational use is the consumers the most effective way to ensure security.
Technological advances will make the future safer lithium-ion battery( kodak klic-7000 battery , kodak klic-7001 battery , kodak klic-7002 battery)
To improve the safety of lithium-ion batteries, first of all to improve the safety of lithium-ion battery cell performance, which is particularly important for high-capacity battery.
A lithium-ion batteries used in mobile phone weighs about 20 grams, the basic requirement is that the probability of accidents occurring is less than one in a million, which is acceptable to the public the minimum standards (the actual situation even smaller than the 1/10000000 ).
Electric bicycle lithium-ion battery packs used in the weight of 3 to 4 kg, 100 times bigger than a cell phone. In addition, the electric motorcycle used in lithium-ion kodak klic-7003 battery , kodak klic-7004 battery , kodak klic-7005 battery , kodak klic-8000 battery weight 15 to 20 kg, used in hybrid electric vehicle battery pack weight of 30 to 100 kilograms of pure electric cars will have to use 300 to 400 kilograms of batteries. If using the same materials and design, under normal circumstances lithium-ion batteries stored in the total energy and its security is inversely proportional to, with the increase in battery capacity, battery size has increased, its thermal performance deterioration, the possibility of an accident sex will increase significantly.
China started to carry out research and development lithium-ion battery electric vehicles when there have been a number of explosions and fire accidents, using lithium cobalt oxide as cathode material for batteries is a major reason. Later, with the modified lithium manganese oxide materials, maturity and use, the battery positive oxidation decreased, and at the same time manganese lithium battery is fully charged, after almost no extra lithium anode, over-charging in the negative the possibility of the formation of lithium dendrite also significantly reduced, our monomer 10 to 30 when the vehicle safety of high-power lithium-ion konica minolta battery , konica minolta np-400 battery , konica minolta np-600 battery safety issues in the "Tenth Five-Year" period has been defied solution. In recent years, new developments out of lithium iron phosphate cathode material was significantly lower than the oxidation of more lithium manganese oxide, from the cathode material point of view, the application of phosphate cathode material will be more conducive to improving the safety of lithium-ion batteries.
But pay attention to safety is not just determined by the cathode material, anode material, electrolyte and konica minolta np-700 battery , konica minolta np-900 battery separator materials, design, manufacture, use, etc. of the many problems still need to be carefully considered.
Graphite is still today a major lithium-ion battery anode material. When the battery is fully charged graphite anode formed LiC6 lively sex and lithium metal is very close to, combined with the graphite layer spacing of the small grain size of large, embedded, and prolapse of its lithium-ion arising from changes in grain size is also large, high-current charge and discharge, the surface of solid electrolyte membrane rupture easily lead to a new reaction gas, bigger capacity battery is not enough security, good performance of the integrated carbon-based and oxide-based anode materials for lithium-ion batteries also to improve the safety of one of the keys. In addition, the selection of mechanical and thermal shutdown performance, better sony vgp-bps8, sony vgp-bps8a, sony vgp-bpl8 battery separator, the development of flame-retardant electrolyte to improve the design to improve heat dissipation capability of the battery is lithium-ion batteries to improve the safety way.
The use of lithium-ion battery also has strict requirements, consumers do not expect is like buying disposable alkaline manganese battery, as found on store shelves on the lithium-ion batteries, "naked" core. Standardized battery cell manufacturers will only be authorized the company to sell its own battery cell, battery cell by these companies will be packaged into a battery pack for sale. The battery pack contains lithium-ion battery protection circuit, the circuit is to prevent battery overcharge, over-discharge, overheating and over-current functions, with special rechargeable battery pack module can be used with a specific electrical co-ordination for the consumers to use.
The safety testing of battery cells should be made more scientific requirements with sony vgp-bps9, sony vgp-bps9/b, sony vgp-bps9/s, sony vgp-bps9a
It is worth mentioning that we should also die on the battery of safety tests to be more scientific requirements for its security checks. There are at present more than on a standard lithium battery safety testing involved in the content, such as UL1642 (USA UL Laboratories), ICE (International Electrotechnical Commission), JIS (Japanese national standard), IEEE (Institute of Electrical and Electronics Engineers) in relevant standards. The test items similar to these standards, but is it different test conditions, various national standards are inconsistent, there are differences between the industry standard, most are some basic requirements, the lack of practical applications associated with specific guidelines, specific to implementation more difficult.
Last year, a large-scale recall of computer batteries after a major international computer and sony vgp-bps9a/b, sony vgp-bpl9, sony vgp-bps10 battery manufacturers started to develop more scientific and better standards of vehicle safety standards for large-capacity battery is being further perfected.
As materials technology advances and people of the lithium-ion battery design, manufacture, testing and use of aspects required by a growing awareness that the future will become safer lithium-ion battery.
Yoshimoto technology has been the Canadian government vehicle lithium sony vgp-bps10/b, sony vgp-bps10/s, sony vgp-bps10a battery research fund
Moli Energy (E-ONEMoliEnergy) has been Canada's Sustainable Development Technology Fund (SDTC) lithium battery of the vehicle research projects, the research fund is administered by the Government of Canada's official business, the main demand in the promotion of the current hottest clean technology (cleantechnology).
In the program evaluation report, with particular emphasis on automotive lithium batteries for automotive applications in the future the importance and indispensability of the field, and help reduce environmental pollution issues in Canada. Lithium-ion battery weight is only half the nickel-metal hydride batteries, life is Ni-MH sony vgp-bps10a/b, sony vgp-bpl10 battery from the vehicle's two-fold, with a working voltage of high energy density, long life and good environmental protection, etc., for future electric vehicle market with a comprehensive of advanced rechargeable batteries will be a trend.
