Specification Conditions for Lithium-ion Battery Industry

Although the number of lithium-ion cell phones that can be replaced has become less and less, news of injuries caused by cell phone battery explosions still occurs from time to time. Battery explosion accidents often attribute problems to users 'private purchases of unqualified lithium-ion batteries in the market. However, more and more mobile phone brands, The factory size of OEM lithium batteries is also uneven, and unqualified batteries are prone to heat, expansion, and explosion risks. In order to standardize the lithium electronics market, the Ministry of Industry and Information Technology has recently promulgated the "Specification Conditions for Lithium-ion Battery Industry". The purpose is to strengthen the management of the lithium ion battery industry, improve the level of development of the industry, guide the transformation and upgrading of the industry, and promote the sustainable and healthy development of the lithium ion battery industry.

The "Standard Conditions for Lithium-ion Battery Industry" sets a threshold in terms of industrial layout, production scale, and product quality. The requirements for production scale are:

1, the annual battery capacity is not less than 100 million watt-hours;

2, the annual production capacity of cathode materials is not less than 2,000 tons;

3, negative material annual production capacity is not less than 2,000 tons;

4, the annual production capacity of the diaphragm is not less than 20 million square meters;

The capacity of electrolytes shall not be less than 2,000 tons per year, and the capacity of electrolytes shall not be less than 500 tons.

6, the actual output of the last year when the enterprise reported is not less than 50 % of the actual production capacity.

Lithium electronics manufacturers should meet the following requirements in their processes, equipment and related facilities:

1, should have the battery positive and negative material iron, zinc, copper and other metal harmful impurity detection ability, the detection accuracy is not less than 1 ppm;

2, should have coating thickness and length detection means, coating thickness measurement accuracy of 2 μm, coating length measurement accuracy of not less than 1mm;

3, it should have the ability to sample the burr generated after the battery electrode is cut, and the detection accuracy is 1 μm;

4, should have the battery electrode drying water content sampling ability, the detection accuracy is 10 ppm;

5, should have the battery electrode winding / laminate after the alignment sampling ability, the detection accuracy is 0.1 mm;

6, should have the battery assembly after the internal short-circuit online detection capability;

7, for the component cells of multi-core batteries, it should have open circuit voltage and internal resistance online detection ability, the detection accuracy is 1 mV and 1 mΩ respectively;

8, should have the protection board function online detection.

In addition, lithium-ion battery manufacturers must have the electrical performance and safety testing capabilities specified in the relevant standards, encourage enterprises to be equipped with environmental adaptive testing instruments and equipment, and have battery environmental adaptive testing capabilities.

battery

1, consumer monomer cell energy density ≥ 150 Wh / kg, battery battery energy density ≥ 120 Wh / kg, polymer monomer cell volume energy density ≥ 550 Wh / L. The cyclic life ≥ 400 times and the capacity retention rate ≥ 80 %.

2, power cells are divided into energy type and power type, in which the energy density of the energy-type single cell ≥ 120 Wh / kg, the energy density of the battery pack ≥ 85 Wh / kg, the cycle life ≥ 1500 times and the capacity retention rate ≥ 80 %. The power density of a power-type single cell ≥ 3000 W/kg, the power density of the battery pack ≥ 2100W/kg, the cycle life ≥ 2000 times, and the capacity retention rate ≥ 80 %. Battery cycle life ≥ 600 times for electric bicycles and capacity retention rate ≥ 80 %, battery cycle life ≥ 500 times for electric tools and capacity retention rate ≥ 80 %.

3, energy storage type cells energy density ≥ 110 Wh/kg, battery battery energy density ≥ 75 Wh/kg, cycle life ≥ 2000 times and capacity retention rate ≥ 80 %.

Positive materials

The specific capacity of the 2032 type battery with button type evaluation results, cycle life with 18650 type evaluation results.

1, lithium cobalt acid specific capacity ≥ 150 Ah/kg, magnetic impurity content ≤ 100 ppb, cycle life 300 times and capacity retention rate ≥ 80 %.

2, lithium manganese acid specific capacity ≥ 95Ah/kg, magnetic impurity content ≤ 100ppb, cycle life 300 times and capacity retention rate ≥ 80 %.

3, lithium iron phosphate specific capacity ≥ 140Ah/kg, cycle life 800 times and capacity retention rate ≥ 80 %.

4, the specific capacity of ternary materials ≥ 150 Ah/kg, the magnetic impurity content ≤ 100 ppb, the cycle life 300 times and the capacity retention rate ≥ 80 %.

5, other positive material performance indicators can refer to the above requirements.

Negative material

The specific capacity of the 2032 type battery with button type evaluation results, cycle life with 18650 type evaluation results.

1, carbon material specific capacity ≥ 320Ah/kg, magnetic impurity content ≤ 100ppb, cycle life 300 times and capacity retention rate ≥ 85 %.

2, lithium titanate material specific capacity ≥ 150 Ah/kg, magnetic impurity content ≤ 100 ppb, cycle life 1000 times and capacity retention rate ≥ 80 %.

3, the specific capacity of Silicon carbon materials ≥ 400Ah/kg, the magnetic impurity content ≤ 100ppb, the cycle life 300 times and the capacity retention rate ≥ 80 %.

4, amorphous carbon negative electrode material specific capacity ≥ 250Ah/kg, the first efficiency & GT; 80 %, cycle life 1000 times and capacity retention rate ≥ 80 %.

5, other negative material performance indicators can refer to the above requirements.

diaphragm

Dry one-way stretching method: longitudinal tensile strength ≥ 110Mpa, thermal shrinkage ≤ 6 %; Horizontal tensile strength ≥ 10Mpa, transverse thermal shrinkage ≤ 1 %, longitudinal thermal shrinkage ≤ 6 %; Puncture strength ≥ 1.33 N / μm; Porosity %; Breathability s/100ml.

Dry bidirectional stretching method: longitudinal tensile strength ≥ 100Mpa, lateral tensile strength ≥ 25Mpa, thermal shrinkage ≤ 5 %, puncture strength ≥ 1.33 N / μm, porosity %, permeability s/100ml.

Wet bidirectional stretching: longitudinal tensile strength ≥ 100Mpa, lateral tensile strength ≥ 60Mpa, thermal shrinkage ≤ 13 %, puncture strength ≥ 2.04 N / μm, porosity %, permeability s/100ml.

The electrolytic liquid water content is not more than 20 ppm, hydrogen fluoride is not more than 50 ppm, and the single metal impurity content is not more than 1 ppm.

Editor's comment: Lithium-ion batteries in daily use involve personal safety, and quality can be said to be very important. The update and refinement of the lithium ion battery industry will cause the closure of small factories with no low quality. However, the standards will be standardized. If the relevant departments do not strictly follow up, user safety will still not be guaranteed.

The page contains the contents of the machine translation.