YD 1268.1-2003[YD/T 1268.1-2003] The safety specification and test method for lithium batteries (English PDF)

4.1.3 Temperature/current management

The battery shall be designed to prevent abnormal rises in battery temperature.

NOTE. If necessary, safety limit shall be set when the battery is charged and discharged.

4.1.4 Terminal connection

The battery housing shall clearly indicate the polarity of the terminal. The size and shape of the terminal shall ensure the maximum current expected to be carried. The external terminal surface shall be made of a conductive material with good mechanical properties and corrosion resistance. The terminal shall be designed to be the least likely to have a short circuit.

4.1.5 Battery cell assembled into battery

The capacities of battery cell and assembled battery shall be closely matched.

The battery cells assembled in the same battery shall have the same structure, the same chemical composition, and be produced by the same manufacturer.

4.2 Safety requirements in normal use

4.2.1 Continuous low rate charging

After the battery cell is tested according to the test method specified in 6.1, it shall not be on fire, explode or leak.

4.2.2 Vibration

After the battery is tested according to the test method specified in 6.2, the battery shall not be on fire, explode or leak.

4.2.3 High temperature performance

After the battery is tested according to the test method specified in 6.3, the outer casing shall be free of deformation or its deformation shall not cause the internal components of the battery to be exposed.

4.2.4 Temperature cycle

After the battery cell or battery is tested according to the test method specified in 6.4, it shall not be on fire, explode or leak.

4.2.5 Low temperature performance

Place the fully charged battery or battery cell in a thermostat that can be thermostated mandatorily. Perform -20°C ~ 75°C temperature cycle according to the following procedures.

(1) make the temperature in thermostat rise to 70°C ± 2°C within 30min and maintain 4h at this temperature;

(2) make the temperature in thermostat drop to 20°C ± 5°C within 30min and maintain 2h at this temperature;

(3) make the temperature in thermostat drop to -20°C ± 2°C within 30min and maintain 4h at this temperature;

(4) make the temperature in thermostat rise to 20°C ± 5°C within 30min and maintain 2h at this temperature;

(5) repeat (1)~(4) and do 4 cycles;

(6) after the 5th cycle, check the battery after it is stored for 2h, which shall meet the requirements of 4.2.4.

NOTE. This test can be performed in a thermostat that can be thermostated mandatorily. It can also be carried out between 3 thermostats of different temperatures.

6.5 Low voltage performance test

Place the fully charged battery cell in a vacuum oven at 20°C ± 5°C. Perform vacuuming to keep the air pressure < 11.6kPa for 6h. After the test, it shall meet the requirements of 4.2.5.

6.6 External short circuit

Place the fully charged battery or battery cell at 20°C ± 5°C and 55°C ± 5°C for

2h, respectively. Then use wiring to short connect the positive and negative terminals of each cell or battery and make sure all the external resistances

< 100mohm. After short connection, maintain 24h or till the temperature of external housing of battery cell or battery is dropped to.

Battery cell or battery original temperature + (maximum temperature rise after battery cell or battery short circuit x20%).

After the test, it shall meet the requirements of 4.3.1.

6.7 Free fall test

Freely drop the fully charged battery cell or battery in any method from the height of 1m to the concrete floor 3 times. After the test, it shall meet the requirements of 4.3.2.

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