How to correctly choose power lithium battery products

The practice of one-sided pursuit of large capacity, high voltage is wrong. First of all, everything is going to have a from Jane to complex, from difficult to easy to process, is also is a flammable gas, effectively guarantee the safety of cigarette lighter is relatively easy to effectively ensure the safety of the car's tank is much more difficult, still not fully resolved crash car fire explosion. In a finite volume accumulated the more power the more bad management, is now the biggest 48 v10ah Suzhou star constant can only guarantee the safety of the battery combination. Second, the higher the voltage, capacity, the greater the protection circuit and the greater the difficulty and failure rate of equalization circuit, so Suzhou stars do not advocate constant, does not support more than 48 v10ah battery combination.

To see whether the lithium battery safety testing certification

First, UL certification

Today, most countries and regions in the world concerning safety, hygiene, environmental protection products of the project, requirements before entering the market must obtain safety certification. UL mark has become one of the world famous security authentication marks.

Test standards are as follows:

1, the shell

Lithium battery shell should have sufficient strength and rigidity to resist the pressures of the slathering, without fire. User replaceable lithium battery should have sufficient strength and not hurt people.

2, electrolyte

User replaceable battery should not contain pressure steam or spewed toxic vapor and liquid eye injuries, or battery shell in normal laboratory conditions (temperature of 23 ℃), the leakage when we should be less than 5 ml of liquid.

3, use,

Lithium battery shall take measures to prevent abnormal when use the charging current, test of an acceptable battery charging current Ic, under the condition of abnormal, should adopt protection measures in the end product.

4, discharge

Leakage or leakage loss to standard quality, the quality of batteries or battery maximum loss does not exceed 1 g0. 5% and 1 ~ 5 g0. > 5 g0. 2% 1%.

5, mechanical test,

Squeeze: (1) through a 32 mm diameter hydraulic pressure on the piston to the battery two flat surface 13 kn (pressure 17.2 Mpa), after reaching the maximum pressure relief. The sample no fire, no explosion.

(2) The impact: with 15.8 mm diameter rod in the sample center, let the weight 9.1 Kg weight from 610 mm high land on sample. The sample no fire, no explosion.

(3) acceleration: the battery on the fixed clamp, respectively along three mutually perpendicular directions (acceleration requirements: the initial minimum average acceleration should reach within three ms 75 g, peak acceleration between 125-175 - g).Test temperature 20 + / - 5 ℃.Samples shall be no fire, no explosion, the other sample is not leakage.

(4) Vibration: battery through simple tuning (along three mutually perpendicular direction) vibration, the vibration frequency within 10-55 hz to 1 hz/min rate, restore back in 90-100 min, the amplitude is 0.8 mm. Samples should be no fire, no explosion, no leakage.

(5) thermal shock: the samples in a natural convection and forced convection heating in the oven, oven temperature for 5 plus or minus 2 ℃ / min speed up to 150 ℃, and keep the stop after 10 min. Samples shall be no fire, no explosion.

(6) Thermal cycling test: batteries in the test indoor and bear the following cycle:

(1) heat up to 70 + 3 ℃ within 30 minutes, insulation 4 h.

(2) cool within 30 minutes to 20 + / - 3 ℃, heat preservation 2 h.

(3) to heat up to 40 + 3 ℃ within 30 minutes, insulation 4 h.

(4) cool within 30 minutes to 20 + / - 3 ℃.

5. Repeat the cycle nine times.

6. After 10 cycles, the battery place waiting for 7 days.The sample should be no fire, no explosion, no leakage.

(7) simulated altitude: sample cell in the absolute pressure of 11.6 Kpa (1.68 psi), 20 + / - 3 ℃ (68 + / - 5 ° F) under the condition of storage of 6 hours. Sample battery explosion or fire, cannot have a hole or leak.

6, charge and discharge test

(1) the charge and discharge cycle: test temperature 25 ℃, batteries in accordance with the requirements of the manufacturer to charge and discharge cycle, cycle to the capacity of 25% of the initial nominal capacity or continuous loop terminates after 90 days. Sample should not be any security event.

(2) the short circuit test: in this paper, the resistance value is less than 0.1 Ω copper to sub of battery is negative, the battery discharge until a fire or explosion, or until the battery to discharge completely shell temperature to stop down to room temperature (test at room temperature 60 situation of plus or minus 2 ℃).Samples should be no fire, no explosion, shells or battery shell temperature does not exceed 150 ℃.

(3) abnormal charging test: normal discharge is completed, with three times the normal charging current charging current. No fire, no explosion.

(4) mandatory discharge experiment: the completely discharge batteries at room temperature, after a certain number of the same model with new batteries in series, the formation of the battery pack for short circuit test. Samples shall be no fire, no explosion.

(5) charge: the battery under the condition of full charge in 3 c, 10 v constant current, constant voltage to charge batteries, when the current of 100 ma to constant voltage charging for 48 hours.

7, identify

Battery should identify the manufacturer name, trade name or trademark, design set.Battery should be identified Warning, and a corresponding description.

Second, the Extra Energy standards

Extra

Energy certification is a non-profit organization, tanna headquarters in Germany, the main job is to focus on the global light electric neutrality of information, and provide value-added services, including related to the safety of lithium-ion batteries testing is very strict, rigorous, recognised by most European customers.

The following table test standards.

Test method test before the state safety standard test method

1 abnormal charge at room temperature, empty, original factory assembly.Remove the protection and management of circuit, in the case of a full charge the battery pack, battery pack with 10 a current charging to 1.5 times the nominal voltage.

No fire, no explosion; Testing process of battery shell temperature less than 120 ℃;The experiment tables are not burning coke; Release the gas, non-toxic.

2 short circuit

At room temperature, original charger to full power, original assembly.

Remove the protection and management of circuit, under the condition of the battery is full of electricity, direct short circuit across the electrodes of the battery pack.

No fire, no explosion; Testing process of battery shell temperature less than 120 ℃;The experiment tables are not burning coke; Release the gas, non-toxic.

3 weight extrusion temperature, original charger to charge to the electricity, original factory assembly. 15 cm diameter steel roller, 10 tons of pressure extrusion on the battery pack.

No fire, no explosion; The gas, solid and liquid non-toxic battery overflow.

Third, CE certification

In recent years, in the European economic area (the European Union, the European free trade association member, except Switzerland) in the sale of products on the market, more and more on the use of the sign of CE certification, labeled with CE certification of commodity said it conform to the safety, health, environmental protection and consumer protection, and a series of European directives to express requirements.

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