Power Lithium Battery Product Analysis
October 6th, 2010 | battery news | Comments Off
Power Lithium Battery Product Analysis
Has the “ultimate energy” and “green energy,” said the lithium-ion batteries, since the 90s of last century since the advent of electronic products from the button batteries, cell phone, DC digital products in the lithium battery, the electric vehicle in the battery power, is increasingly widely used in people’s production and life. Compared with other batteries, lithium-ion batteries on whether it is from the volume, weight, or from the performance, have a great advantage.
To use in a reasonable range of voltage within the capacity of lithium batteries, one-sided pursuit of large capacity, high voltage is wrong. First, any thing to go through a simple to complex, from hard to easy the process is also flammable like gas, effectively guarantee the safety of lighters is relatively easy, to effectively guarantee the safety of fuel tanks would much more difficult, crash is still not fully resolved the situation when the car caught fire and exploded. A limited volume in the more energy the more the accumulation of bad management, is currently the largest in Suzhou Star 48V10Ah constant can only guarantee the safety of the battery combination. Second, the higher the voltage, the greater the capacity, protection circuit and a balanced circuit the greater the difficulty and failure rate, so do not advocate Suzhou Star constant and does not support beyond 48V10Ah battery combination.
Depends on the safety of lithium battery testing and certification
A, UL certified
Today, most countries and regions in the world involving security, health, environmental protection projects such as product requirements must be obtained before entering the market, the safety certification. UL mark has become world famous one of the safety certification mark.
Testing standards are as follows:
1, shell
Li-ion battery shell should have sufficient strength and rigidity sufficient to resist the pressure of the indiscriminate, without causing fire. User-replaceable lithium battery should have sufficient strength they would not hurt people.
2, electrolyte
User replaceable batteries should not contain the pressure of vapor or smoke damage the eyes of the toxic vapor and liquid, or the battery case in the normal laboratory conditions (temperature 23 °C), by the shock fluid leakage should be less than 5ml.
3, the use of
Li-ion battery should be used to take measures to avoid the normal charging current, the test has an acceptable battery charge current Ic, not normal conditions, the end product should be used in protective measures.
4, the leakage
Mass loss of leakage or leakage standards, the quality of batteries or battery does not exceed the maximum loss 1g0.5%, 1 ~ 5g0.2%> 5g0.1%.
5, mechanical tests
(1) extrusion: 32mm diameter by a hydraulic piston two flat surfaces on the battery pressure 13KN (pressure 17.2Mpa), when the maximum pressure after pressure relief. Sample no fire, no explosion.
(2) Impact: 15.8mm in diameter on the sample center of the rod, so that the weight of 9.1Kg of weight fell from a height of 610mm specimen. Sample no fire, no explosion.
(3) Acceleration: batteries on the fixture, respectively, the three mutually perpendicular directions along the acceleration (acceleration requirements: the initial acceleration of 3ms to be achieved within the minimum average 75g, peak acceleration is between 125-175g). Test temperature 20 ± 5 °C. Samples should be no fire, no explosion, another sample is not leakage.
(4) vibration: a simple cell tuning withstand vibration (along the three mutually perpendicular directions), 10-55Hz frequency range in order to 1Hz/min rate changes in 90-100min to restore back to an amplitude of 0.8mm. Samples should be no fire, no explosion, no leak.
(5) Thermal Shock: the sample in a natural convection or forced convection oven heating, the oven temperature to 5 ± 2 °C / min rate of heating to 150 °C, and keep the stop after 10min. Samples should be no fire, no explosion.
(6) thermal cycle test: the test room and placed the battery under the following cycle:
6, charge and discharge test
(1) charge and discharge cycles: test temperature 25 °C, according to the manufacturer’s batteries to charge and discharge cycles required, the initial nominal capacity of recycling to 25% capacity or 90 days after the termination of a continuous loop. Samples should not be any security incidents.
(2) short-circuit test: less than 0.1Ω resistance of copper wire on the positive and negative for short-circuit the battery, the battery discharge until the fire or explosion, or until the battery is fully discharged, the temperature back to room temperature to stop the shell (test at room temperature for 60 ± 2 °C circumstances.) Samples should be no fire, no explosion, the shell or the battery case temperature does not exceed 150 °C.
(3) non-normal charge test: normal discharged to 3 times the normal charge current of the current charge. No fire, no explosion.
(4) forced discharge test: fully discharged batteries at room temperature, and a number of new batteries of the same model in series, the formation of the battery pack short circuit test. Samples should be no fire, no explosion.
(5) over charge: the battery in fully charged condition to 3C, 10V constant current, constant voltage to charge the battery, when the current reaches 100mA, the converted constant voltage for 48 hours.
7, identifies
The battery manufacturer should identify the name, trade name or trademark, style setting. The battery identification Warning, and a corresponding description.
Second, ExtraEnergy standards
ExtraEnergy certification is a non-profit organization based in Germany, Tanzania Na, the main work is to focus on the global neutrality of light electric vehicles of information, and provide value-added services, including testing related to the safety of lithium batteries is very strict, rigorous, get most European customers.
Testing standards are listed below.
Test methods test the safety standards before the state test method
1 Non-normal charge at room temperature, and air power, the original assembly. Removal and management of circuit protection circuit, in the case of the battery pack is fully charged, the battery had to 10A charge current to 1.5 times the nominal voltage. No fire, no explosion; battery shell temperature during the test is less than 120 °C; experimental wooden table is not burning coke; the release of toxic gases.
2 short
Room temperature, the original charger to be fully charged, the original assembly.
Removal and management of circuit protection circuit, the battery pack is fully charged in the case of direct positive and negative battery short circuit. No fire, no explosion; battery shell temperature during the test is less than 120 °C; experimental wooden table is not burning coke; release of toxic gases.
3 heavy compression at room temperature, the original charger to be fully charged, the original assembly. 15 cm diameter steel rolls, 10 tons of pressure to squeeze the battery pack. No fire, no explosion; battery overflow of gas, solid and liquid non-toxic.
Third, CE certification
In recent years, the European Economic Area (the European Union, the European Free Trade Association member countries, except Switzerland) commodities on the market, CE certification mark, more and more CE certification mark affixed to goods that their safety, health, environmental and consumer protection and a series of European directives to express requirements.
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