IEC62133 For 10400mAh Power Bank/8400mAh Power Bank/8000mAh Power Bank/7800mAh Power Bank

Charging procedure for test purposes

7.1

Unless otherwise stated in this standard, the charging procedure for test purposes is carried out in an ambient temperature of 20℃±5℃, using the method declared by the manufacturer.

Prior to charging, the battery shall have been discharged at 20℃±5℃at a constant current of 0,2It A down to a specified final voltage.

Continuous low-rate charging (cells)

7.2.1

a)Requirement:A continuous low-rate charge shall not cause fire or explosion.

b)Test:Fully charged cells are subjected for 28 days to a charge as specified by the manufacturer.

c)Acceptance criteria:No fire, no explosion.

Vibration

7.2.2

a) Requirements:Vibration encountered during transportation shall not cause leakage, fire or explosion.

b) Test:Fully charged cells or batteries are vibration-tested under the following test conditions and the sequence in table 3. A simple harmonic motion is applied to the cells or batteries with an amplitude of 0.76 mm, and a total maximum excursion of 1.52 mm. The frequency is varied at the rate of 1 Hz/min between the limits of 10 Hz and 55 Hz. The entire range of frequencies (1 0 Hz to 55 Hz) and return (55Hz to 10 Hz) is traversed in 90 m in ± 5 m in for each mounting position (direction of vibration). The vibration is applied in each of three mutually perpendicular directions, in the sequence specified below.

Step 1: Verify that the measured voltage is typical of the charged product being tested.

Steps 2-4: Apply the vibration as specified in Table 3.

Step 5: Rest cell for 1 h, and then make a visual inspection.

c) Acceptance criteria:No fire, no explosion, no leakage

Moulded case stress at high ambient temperature (batteries)

7.2.3

a) Requirement

Internal components of batteries shall not be exposed during use at high temperature.

b) Test

Fully charged batteries are exposed to a moderately high temperature to evaluate case integrity. The battery is placed in an air circulating oven at a temperature of 70℃ ± 2℃. The batteries remain in the oven for 7 h, after which they are removed and allowed to return to room temperature.

c) Acceptance criteria

No physical distortion of the battery case resulting in exposure of internal components.

Temperature cycling

7.2.4

a) Requirements

Repeated exposure to high and low temperatures shall not cause fire or explosion.

b) Test according to the following procedure and the profile shown in Figure 1.

Fully charged cells or batteries are subjected to temperature cycling (- 20℃. +75℃), in forced draught chambers, according to the following procedure.

Step 1: Place the cells or batteries in an ambient temperature of 75 ℃± 2 ℃ for 4 h.

Step 2: Change the ambient temperature to 20℃ ±5℃ within 30 min and maintain at this temperature for a minimum of 2 h.

Step 3: Change the ambient temperature to -20℃ ±2℃ within 30 min and maintain at this temperature for 4 h.

Step 4: Change the ambient temperature to 20℃ ± 5℃ within 30 min and maintain at this temperature for a minimum of 2 h.

Step 5: Repeat steps 1 to 4 for a further four cycles.

Step 6: After the fifth cycle, store the cells or batteries and check after a rest period of at least 24 h.

NOTE This test can be performed in a single chamber whose temperature is changed or in three separate chambers at three different test temperatures.

c) Acceptance criteria

No fire, no explosion, no leakage.

Incorrect installation (cells)

7.3.1

a) Requirements

The incorrect installation of a single cell in a multi-cell application shall not cause fire or explosion

b) Test

Fully charged cells are evaluated under conditions in which one of the cells is incorrectly installed. Four fully charged single cells of the same brand, type, size and age are connected in series with one of the four cells reversed. The resultant assembly is connected across a resistor of 1 Ω until the vent opens or until the temperature of the reversed cell returns to ambient temperature. Alternatively, a stabilized d.c. power supply can be used to simulate the conditions imposed on the reversed cell.

c) Acceptance criteria

No fire, no explosion

External short circuit

7.3.2

a) Requirements

Short-circuiting of the positive and negative terminals shall not cause fire or explosion.

b) Test

Two sets of fully charged cells or batteries are stored in an ambient temperature of 20℃ ± 5℃ and +55℃ ±5℃ respectively. Each cell or battery is then short-circuited

by connecting the positive and negative terminals with a total external resistance of 80 mΩ± 20 mΩ. The cells or batteries remain on test for 24 h or until the case temperature declines by 20 % of the maximum temperature rise, whichever is the sooner.

c) Acceptance criteria

No fire, no explosion.

Free fall

7.3.2

a) Requirements

Dropping a cell or battery (for example, from a bench top) shall not cause fire or explosion.

b)Test

Each fully charged cell or battery is dropped three times from a height of 1.0 m onto a concrete floor. The cells or batteries are dropped so as to obtain impacts in random orientations. After the test, the sample shall be put on rest for a minimum of one hour and then a visual inspection shall be performed.

c) Acceptance criteria

No fire, no explosion.

Mechanical shock (crash hazard)

7.3.4

a) Requirements

Shocks encountered during handling or transportation shall not cause fire, explosion or leakage.

b) Test

The fully charged cell or battery is secured to the testing machine by means of a rigid mount which will support all mounting surfaces of the cell or battery. The cell or battery is subjected to a total of three shocks of equal magnitude. The shocks are applied in each of three mutually perpendicular directions. At least one of them shall be perpendicular to a flat face. For each shock the cell or battery is accelerated in such a manner that during the initial 3 ms the minimum average acceleration is 75 gn· The peak acceleration shall be between 125 gn and 175 gn. Cells or batteries are tested in an ambient temperature of 20 ℃ ± 5℃. After the test, the sample shall be put on rest for a minimum of one hour and then a visual inspection shall be performed.

c) Acceptance criteria

No fire, no explosion, no leakage.

Thermal abuse (cells)

7.3.5

a) Requirements

An extremely high temperature shall not cause fire or explosion.

b) Test

Each fully charged cell, stabilized at room temperature, is placed in a gravity or circulating air-convection oven. The oven temperature is raised at a rate of 5℃/min ± 2℃/min to a temperature of 130℃± 2℃. The cell remains at this temperature for 10 min before the test is discontinued.

c) Acceptance criteria

No fire, no explosion.

Crushing of cells

7.3.6

a) Requirements

Severe crushing of a cell (for example, during disposal in a waste compactor) shall not cause fire or explosion.

b) Test

Each fully charged cell is crushed between two flat surfaces. The force for the crushing is applied by a hydraulic ram exerting a force of 13 kN ± 1 kN. The crushing is performed in a manner that will cause the most adverse result. Once the maximum force has been applied, or an abrupt voltage drop of one-third of the original voltage has been obtained, the force is released.

A cylindrical or prismatic cell is crushed with its longitudinal axis parallel to the flat surfaces of the crushing apparatus . To test both wide and narrow sides of prismatic cells, a second set of cells is tested, rotated 90°around their longitudinal axes compared to the first set.

c) Acceptance criteria

No fire, no explosion.

Low pressure (cells)

7.3.7

a) Requirements

Low pressure (for example, during transportation in an aircraft cargo hold) shall not cause fire or explosion.

b) Test

Each fully charged cell is placed in a vacuum chamber, in an ambient temperature of 20℃ ± 5℃. Once the chamber has been sealed, its internal pressure is gradually reduced to a pressure equal to or less than 11.6 kPa (this simulates an altitude of15240 m) held at that value for 6 h.

c) Acceptance criteria

No fire, no explosion, no leakage

Overcharge

7.3.8

a) Requirements

Charging for longer periods and at a higher rate than specified by the manufacturer shall not cause fire or explosion.

b) Test

A discharged cell or battery is subjected to a high-rate charge of 2.5 times the recommend charging current for a time that produces a 250 % charge input (250 % of rated capacity).

c) Acceptance criteria

No fire, no explosion.

Forced discharge (cells)

7.3.9

a) Requirements

A cell in a multi-cell application shall withstand polarity reversal without causing fire or explosion.

b) Test

A discharged cell is subjected to a reverse charge at 1 It A for 90 min.

c) Acceptance criteria

No fire, no explosion.

Charging procedures for test purposes

8.1

7.2.1

8.1.1 First procedure

(This charging procedure applies to subclauses other than those specified in 8.1.2)

Unless otherwise stated in this standard, the charging procedure for test purposes is carried out in an ambient temperature of 20℃ ± 5℃, using the method declared by the manufacturer.

Prior to charging, the battery shall have been discharged at 20℃ ± 5℃ at a constant current of 0.2 It A down to a specified final voltage.

8.1.2 Second procedure

(This charging procedure applies only to 8.3. 1, 8.3.2, 8.3.4, 8.3.5, and 8.3.9)

After stabilization for 1 to 4 hours respectively at ambient temperature of highest test temperature and lowest test temperature, as specified in Table 4 (currently for lithium cobalt oxide), cells are charged by using the upper limited charging voltage and maximum charging current, until the charging current is reduced to 0.05It A. using a constant voltage charging method.

Table 4- Condition of charging procedure

If a cell's specified upper and/or lower charging temperature exceeds values for the upper and/or lower limit test temperatures of Table 4, the cell shall be charged, and if applicable tested, at the specified values plus 5℃ for the upper limit and minus 5℃for the lower limit. The cells shall fulfil the criteria of 8.3. 1, 8.3.2, 8.3.4, 8.3.5, and 8.3.9. There shall also be a valid rationale provided regarding how the cell's safety is ensured. (See Figure A.1 )

NOTE 1 In case of a dillerent upper limit charging voltage (i.e. other than for lithium cobalt oxide systems at 4,25 V), it can be appropriate to adjust the upper limit charging voltage and upper limit charging temperatures accordingly to fulfil the criteria of 8.3.1, 8.3.2. 8.3.4, 8.3.5. and 8.3.9 and have a valid rationale to ensure the safety of the cell. (See Figure A.1)

NOTE 2 New chemistries systems will be incorporated in the standard when new data becomes available.

Continuous charging at constant voltage (cells)

8.2.1

a) Requirement

A continuous charge at constant voltage shall not cause fire or explosion.

b) Test

Fully charged cells are subjected for 7 days to a charge as specified by the manufacturer.

c) Acceptance criteria

No fire, no explosion, no leakage

Moulded case stress at high ambient temperature (battery)

8.2.2

a) Requirement

Internal components of batteries shall not be exposed during use at high temperature.

b) Test

Fully charged batteries, according to the first procedure in 8.1.1, are exposed to a moderately high temperature to evaluate case integrity. The battery is placed in an air circulating oven at a temperature of70℃ ±