ISO 12405-1-2011《Electrically propelled road vehicles —Test specification for lithium-ion traction battery packs and systems —Part 1 High-power applications》

试验项目

章节号

标准要求

Energy and capacity at room temperature

7.1

The test shall be performed at Troom, with the discharge rates of 1 C, 10 C and the maximum C rate as

permitted by the supplier (the maximum C rate corresponds to Id,max).

The test sequence shall be performed as specified in Table 1.

Table 1 — Test sequence energy and capacity test at room temperature

Step Procedure Test

temperature

1.1 Thermal equilibration Troom

1.2 Standard charge (SCH) Troom

1.3 Standard cycle (SC) Troom

2.1 Discharge at 1 C Troom

2.2 Standard charge (SCH) Troom

2.3 Discharge at 1 C Troom

2.4 Standard charge (SCH) Troom

2.5 Discharge at 10 C Troom

2.6 Standard charge (SCH) Troom

2.7 Discharge at 10 C Troom

2.8 Standard charge (SCH) Troom

2.9 Discharge at Id,max Troom

2.10 Standard charge (SCH) Troom

2.11 Discharge at Id,max Troom

2.12 Standard charge (SCH) Troom

3.1 Standard cycle (SC) Troom

⎯ The SCH procedure shall follow 6.2.2.3.

⎯ The SC procedure shall follow 6.2.

⎯ All discharge tests shall be terminated at the supplier's discharge voltage limits.

⎯ After discharge, the DUT shall rest at least for 30 min or shall be thermally equilibrated at the required

ambient temperature or a fixed time period shall be used to allow for thermal equilibration before starting

the next step in the test sequence.

Energy and capacity at different temperatures and discharge rates

7.2

The test shall be performed at three different temperatures (40 °C, 0 °C and −18 °C) with the discharge rates

1 C, 10 C and the maximum C rate as permitted by the supplier (the maximum C rate corresponds to Id,max).

The test sequence shall be performed as specified in Table 2.

Step Procedure Test

temperature

1.1 Thermal equilibration Troom

1.2 Standard charge (SCH) Troom

1.3 Standard cycle (SC) Troom

2.1 Thermal equilibration 40 °C

2.2 Standard charge (SCH) for top off 40 °C

2.3 Discharge at 1 C 40 °C

2.4 Standard charge (SCH) 40 °C

2.5 Discharge at 1 C 40 °C

3.1 Thermal equilibration Troom

3.2 Standard charge (SCH) Troom

3.3 Standard cycle (SC) Troom

4.1 Thermal equilibration 40 °C

4.2 Standard charge (SCH) for top off 40 °C

4.3 Discharge at 10 C 40 °C

4.4 Standard charge (SCH) 40 °C

4.5 Discharge at 10 C 40 °C

5.1 Thermal equilibration Troom

5.2 Standard charge (SCH) Troom

5.3 Standard cycle (SC) Troom

6.1 Thermal equilibration 40 °C

6.2 Standard charge (SCH) for top off 40 °C

6.3 Discharge at Id,max 40 °C

6.4 Standard charge (SCH) 40 °C

6.5 Discharge at Id,max 40 °C

7.1 Thermal equilibration Troom

7.2 Standard charge (SCH) Troom

7.3 Standard cycle (SC) Troom

8.1 Thermal equilibration 0 °C

8.2 Standard charge (SCH) for top off 0 °C

8.3 Discharge at 1 C 0 °C

8.4 Standard charge (SCH) 0 °C

8.5 Discharge at 1 C 0 °C

9.1 Thermal equilibration Troom

9.2 Standard charge (SCH) Troom

9.3 Standard cycle (SC) Troom

10.1 Thermal equilibration 0 °C

10.2 Standard charge (SCH) for top off 0 °C

10.3 Discharge at 10 C 0 °C

10.4 Standard charge (SCH) 0 °C

10.5 Discharge at 10 C 0 °C

11.1 Thermal equilibration Troom

11.2 Standard charge (SCH) Troom

11.3 Standard cycle (SC) Troom

12.1 Thermal equilibration 0 °C

12.2 Standard charge (SCH) for top off 0 °C

12.3 Discharge at Id,max 0 °C

12.4 Standard charge (SCH) 0 °C

12.5 Discharge at Id,max 0 °C

13.1 Thermal equilibration Troom

13.2 Standard charge (SCH) Troom

13.3 Standard cycle (SC) Troom

14.1 Thermal equilibration −18 °C

14.2 Standard charge (SCH) for top off −18 °C

14.3 Discharge at 1 C −18 °C

14.3 Standard charge (SCH) −18 °C

14.4 Discharge at 1 C −18 °C

15.1 Thermal equilibration Troom

15.2 Standard charge (SCH) Troom

15.3 Standard cycle (SC) Troom

16.1 Thermal equilibration −18 °C

16.2 Standard charge (SCH) for top off −18 °C

16.3 Discharge at 10 C −18 °C

16.4 Standard charge (SCH) −18 °C

16.5 Discharge at 10 C −18 °C

17.1 Thermal equilibration Troom

17.2 Standard charge (SCH) Troom

17.3 Standard cycle (SC) Troom

18.1 Thermal equilibration −18 °C

18.2 Standard charge (SCH) for top off −18 °C

18.3 Discharge at Id,max −18 °C

18.4 Standard charge (SCH) −18 °C

18.5 Discharge at Id,max −18 °C

19.1 Thermal equilibration Troom

19.2 Standard charge (SCH) Troom

19.3 Standard cycle (SC) Troom

Power and internal resistance

7.3

The test shall be performed at five different temperatures (40 °C, Troom, 0 °C, −10 °C and −18 °C) and shall cover an SOC range of 80 % to 20 % within five steps (80 %, 65 %, 50 %, 35 %, 20 %), whereas the last step at 20 % SOC shall only be performed if the maximum discharge current of the DUT is equal to or less than a 10 C current rate in order to avoid a deep discharge of the DUT.

⎯ Prior to each test temperature, the DUT shall be conditioned at Troom in accordance with the thermal equilibration requirements provided in 5.1, followed by an SCH as provided in 6.2.2.3 for top off and an SC as provided in 6.2.

⎯ Then, the DUT shall be conditioned at the specified test temperature in accordance with the thermal equilibration requirements provided in 5.1, followed by an SCH as provided in 6.2.2.3. The SCH is required in order to condition the DUT to 100 % SOC at the specified test temperature prior to the pulse power characterization test profile.

⎯ In the next step, the fully charged DUT shall be discharged with a 1 C rate to the initial SOC of 80 % followed by a minimum 30 min rest period.

⎯ Then, the pulse power characterization profile as described in 7.3.2 shall be performed.

⎯ The next SOC steps (65 %, 50 %, 35 % and 20 %) shall be reached by a 1 C discharge followed by a 30 min rest period. Then, the pulse power characterization profile as described in 7.3.2 shall be performed at each mentioned SOC step.

NOTE The last step at 20 % SOC is performed only if possible.

⎯ At the end of the pulse power characterization profile, at the 20 % SOC level, the SCH shall be performed.

Data sampling, especially for DUT voltage and current shall be performed with an adequate sampling rate, e.g.

10 ms.

The complete test sequence shall be performed as specified in Table 6.

Table 6 — Test sequence power and internal resistance test

Step Procedure Test

temperature

1.1 Thermal equilibration Troom

1.2 Standard charge (SCH) for top off Troom

1.3 Standard cycle (SC) Troom

2.1 Thermal equilibration Troom

2.2 Standard charge (SCH) for top off Troom

2.3 Pulse power characterization Troom

2.4 Standard charge (SCH) Troom

3.1 Thermal equilibration Troom

3.2 Standard charge (SCH) for top off Troom

3.3 Standard cycle (SC) Troom

4.1 Thermal equilibration 40 °C

4.2 Standard charge (SCH) for top off 40 °C

4.3 Pulse power characterization 40 °C

4.4 Standard charge (SCH) 40 °C

5.1 Thermal equilibration Troom

5.2 Standard charge (SCH) for top off Troom

5.3 Standard cycle (SC) Troom

6.1 Thermal equilibration 0 °C

6.2 Standard charge (SCH) for top off 0 °C

6.3 Pulse power characterization 0 °C

6.4 Standard charge (SCH) 0 °C

7.1 Thermal equilibration Troom

7.2 Standard charge (SCH) for top off Troom

7.3 Standard cycle (SC) Troom

8.1 Thermal equilibration −10 °C

8.2 Standard charge (SCH) for top off −10 °C

8.3 Pulse power characterization −10 °C

8.4 Standard charge (SCH) −10 °C

9.1 Thermal equilibration Troom

9.2 Standard charge (SCH) for top off Troom

9.3 Standard cycle (SC) Troom

10.1 Thermal equilibration −18 °C

10.2 Standard charge (SCH) for top off −18 °C

10.3 Pulse power characterization −18 °C

10.4 Standard charge (SCH) −18 °C

11.1 Thermal equilibration Troom

11.2 Standard charge (SCH) for top off Troom

11.3 Standard cycle (SC) Troom

12.1 Thermal equilibration Troom

12.2 Standard charge (SCH) for top off Troom

12.3 Pulse power characterization Troom

12.4 Standard charge (SCH) Troom

No-load SOC loss

7.4

be supplied with the necessary auxiliary power (e.g. 12 V d.c. power supply) in order to be able to control necessary battery system functions during the rest period, for example a) battery system cell balancing, and

b) periodical BCU wake-up activities. The no-load SOC loss rate(s) shall include any possible parasitic or operational discharge contribution of the cell balancing circuitry itself beyond the inherent self-discharge rate of the battery cells themselves. The no-load SOC loss rate of the battery system shall be measured for three different rest periods and at two different temperatures. The battery system is discharged to 80 % SOC (or to an SOC agreed between the supplier and customer) and then left at open circuit for a certain time. The BCU shall be able to perform control activities (e.g. cell balancing and regular wake-up activities). After the rest period, the remaining SOC shall be determined by a 1 C discharge at Troom.

The tests shall be performed in a temperature-controlled test chamber at the given temperatures. Before each test cycle at a given temperature, the battery shall be kept at the test temperature for a minimum of 12 h. This period can be reduced if thermal equilibration is reached, specified as less than 4 K change among individual cell temperatures during an interval of 1 h.

⎯ Temperatures: Troom and 40 °C;

⎯ Standard cycle: to ensure that each test is done with the battery system in the same initial condition, an SC (see 6.2) shall be performed prior to each test;

⎯ Discharge rate: discharge the battery system to 80 % SOC (or to an SOC agreed between the supplier and customer) at 1 C rate;

⎯ Rest period: 24 h (1 day), 168 h (7 days) and 720 h (30 days);

⎯ Auxiliary energy: auxiliary energy consumption (e.g. 12 V d.c. level) for the BCU and, if required, for other battery system electronics shall be measured continuously and expressed in watt hours (W⋅h) for each rest period.

SOC loss at storage

7.5

The SOC loss at storage behaviour shall be measured with a complete and fully operational battery system. During the storage period, all battery system terminals shall be disconnected (e.g. voltage class B connections, voltage class A connection and cooling). The service disconnect device, if any, shall be disconnected.

The SOC loss at storage of the battery system shall be measured after a 720 h (30 days) rest period at 45 °C ambient temperature with an initial SOC of 50 %. The remaining capacity after the storage period shall be determined by a 1 C discharge. The SOC loss at storage test shall be performed in a temperature controlled test chamber.

⎯ Temperature: 45 °C;

⎯ Standard cycle: to ensure that each test is done with the battery system in the same initial condition, an SC (see 6.2) shall be performed prior to the capacity loss at storage test;

⎯ Discharge rate: discharge the battery system to 50 % SOC at 1 C rate;

⎯ Rest period: 720 h (30 days);

⎯ Auxiliary energy: during the storage period, all connections at the battery system are disconnected;

⎯ Service disconnect: service disconnect device, if any, shall be disconnected.

Cranking power at low temperature

7.6

The test for cranking power at −18 °C shall be performed at the lowest SOC level permitted, as specified by

the supplier according to the test sequence in Table 10.

Table 10 — Test sequence cranking power at low temperature (−18 °C)

Step Procedure Test

temperature

1.1 Thermal equilibration Troom

1.2 Standard charge (SCH) Troom

1.3 Standard cycle (SC) Troom

1.4 Discharge the fully charged DUT at a 1 C discharge rate to 20 % SOC or the lowest SOC level

allowable as specified by the supplier (minimum SOC)

Troom

1.5 Thermal equilibration −18 °C

1.6 Set constant voltage of test bench to the lowest permitted system discharge voltage level

according to the supplier's recommendation for 5 s and monitor the power versus time profile.

The maximum current shall not exceed the supplier's specification.

−18 °C

1.7 Rest period with open voltage class B circuit for 10 s −18 °C

1.8 Repeat steps 1.6 to 1.7 twice −18 °C

1.9 Thermal equilibration Troom

1.10 Standard charge (SCH) Troom

The sampling rate for test data during testing shall be ≤ 50 ms.

If agreed between the supplier and customer, the test for cranking power shall also be performed at −30 °C at

the lowest SOC level permitted, as specified by the supplier according to the test sequence in Table 11.

Table 11 — Test sequence cranking power at low temperature (−30°C)

Step Procedure Test

temperature

2.1 Thermal equilibration Troom

2.2 Standard charge (SCH) Troom

2.3 Standard cycle (SC) Troom

2.4 Discharge the fully charged DUT at a 1 C discharge rate to 20 % SOC or the lowest SOC

level allowable as specified by the supplier (minimum SOC)

Troom

2.5 Thermal equilibration −30 °C

2.6 Set constant voltage of test bench to the lowest permitted system discharge voltage level

according to the supplier's recommendation for 5 s and monitor the power versus time profile.

The maximum current shall not exceed the supplier's specification.

−30 °C

2.7 Rest period with open voltage class B circuit for 10 s −30 °C

2.8 Repeat steps 2.6 to 2.7 twice −30 °C

2.9 Thermal equilibration Troom

2.10 Standard charge (SCH) Troom

The sampling rate for test data during testing shall be ≤ 50 ms.

Table 12 — Voltage limits for cranking power at low temperature

Time

increment

s

Cumulative

time

s

Applicable

DUT voltage

V

5 5 Lowest permitted system discharge voltage

10 15 Open voltage class B circuit

5 20 Lowest permitted system discharge voltage

10 30 Open voltage class B circuit

5 35 Lowest permitted system discharge voltage

10 45 Open voltage class B circuit

The profile pulses shall be performed for the full 5 s duration (even if the test power has to be limited to stay

within the minimum permitted discharge voltage) to permit the later calculation of low-temperature cranking

power capability (see Table 12).

Cranking power at high temperature

7.7

The test for cranking power at 50 °C shall be performed at the lowest SOC level permitted as specified by the supplier according to the test sequence in Table 13.

Step Procedure Test

temperature

1.1 Thermal equilibration Troom

1.2 Standard charge (SCH) Troom

1.3 Standard cycle (SC) Troom

1.4 Discharge the fully charged DUT at a 1 C discharge rate to 20 % SOC or the

lowest SOC level allowable as specified by the supplier (minimum SOC).

Troom

1.5 Thermal equilibration 50 °C

(or max. temperature specified

by the supplier)

1.6 Set constant voltage of test bench to the lowest permitted system discharge

voltage level according to the supplier's recommendation for 5 s and monitor

the power versus time profile. The maximum current shall not exceed the

supplier's specification.

50 °C

(or max. temperature specified

by the supplier)

1.7 Rest period with open voltage class B circuit for 10 s 50 °C

(or max. temperature specified

by the supplier)

1.8 Repeat steps 1.6 to 1.7 twice 50 °C

(or max. temperature specified

by the supplier)

1.9 Thermal equilibration Troom

1.10 Standard charge (SCH) Troom

1.11 Standard cycle (SC) Troom

The sampling rate for test data during testing shall be ≤ 50 ms.

Table 14 — Voltage limits for cranking power at high temperature

Time increment

s

Time cumulative

s

Applicable DUT voltage and current

V and A

5 5 Lowest permitted system discharge voltage and

maximum permitted discharge current

10 15 Open circuit

5 20 Lowest permitted system discharge voltage and

maximum permitted discharge current

10 30 Open circuit

5 35 Lowest permitted system discharge voltage and

maximum permitted discharge current

The profile pulses according to Table 13 shall be performed for the full 5 s duration (even if it is necessary to

limit the test power to stay within the minimum permitted discharge voltage) to permit the later calculation of

the cranking power capability at high temperature.

Energy efficiency

7.8

The following conditions apply:

⎯ Troom, 40 °C, 0 °C;

⎯ three different SOC: 65 %, 50 %, 35 %;

⎯ 30 min rest period before each power pulse sequence application for equilibrium;

⎯ adequate rest period (see general conditions in 5.1) after temperature change for thermal equilibration;

⎯ current profile for energy efficiency characterization as described in Table 15.

Table 15 — Energy efficiency test profile

Time increment

s

Time cumulative

s

Current

A

0 0 0

12 12 20 C or Idp,max

40 52 0

16 68 −15 C or −0,75 Idp,max

40 108 0

The charge balance (A⋅h) during this current profile pulse sequence shall be neutral. That means the

recharged capacity shall be exactly the same as the discharged capacity before. In case of voltage limitations

and current degradations during the power pulse sequence, only the charge neutral periods shall be evaluated.

This case shall be indicated clearly in the reported results.

Cycle life

7.9

Table 19 — Test sequence for cycle life test

Step Procedure Test

temperature

1 Thermal equilibration Troom

2 Standard cycle (SC) Troom

3 Standard cycle (SC) for 1 C capacity determination Troom

4 Standard discharge (SCH) to 80 % SOC or other upper limit SOC defined by the customer Troom

5 Cycling by the discharge-rich profile until:

⎯ SOC 30 % or other lower limit SOC defined by the customer;

⎯ battery voltage reaches lower limit defined by the supplier

Troom

6 Cycling by the charge-rich profile until:

⎯ SOC 80 % or other upper limit SOC defined by the customer;

⎯ battery voltage reaches upper limit defined by the supplier

Troom

7 Repeat steps 5 and 6 for 22 h Troom

8 Each day after 22 h of cycling and at the end of the charge-rich profile:

⎯ the rest period for equilibration of cell voltages and temperature shall be agreed

between the supplier and customer

Troom

9 Every week after 7 days of cycling, perform power test with the following test sequence:

⎯ thermal equilibration;

⎯ standard charge (SCH);

⎯ standard cycle (SC);

⎯ pulse power characterization;

⎯ standard charge (SCH)

Troom

10 Continue with step 4, but every two weeks continue with step 2 in order to perform 1 C

capacity determination

Troom

Dewing — Temperature change

8.1

Perform the test in accordance with IEC 60068-2-30, Db, with the following modifications:

⎯ humidity and temperature profiles according to Figure 10;

⎯ number of cycles: five.

Use operating mode 2.1 in accordance with ISO 16750-1 during the complete test sequence.

If the temperature of the DUT exceeds the limits given by the supplier, the DUT should be operated in an operating mode as agreed between the customer and supplier.

NOTE The temperature and humidity profile is specified to generate dewing effects approximating the vehicle

environment.

Thermal shock cycling

8.2

Adjust the SOC with a 1 C discharge to 50 % before starting the thermal shock cycling profile.

With the DUT at 50 % SOC and at Troom, contained in a closed volume and with all thermal controls disabled,

thermally cycle the DUT with ambient temperature between 85 °C or Tmax as specified between the supplier

and customer to −40 °C (the ambient temperature should be measured in close proximity to the DUT). The

time to reach each temperature extreme shall be 30 min or less. If it is logistically possible, given equipment

limitations and safety considerations, the DUT can be moved between two test chambers each set at the

opposite end of the temperature range. The DUT shall remain at each extreme for a minimum of 1 h. A total of

five thermal cycles shall be performed. After thermal cycling, inspect the DUT for any damage, paying special

attention to any seals that can exist. Verify that control circuitry is operational.

Operating mode shall be the continuous monitoring of temperatures and voltages of all available measuring

points of the DUT.

After thermal shock cycling, the DUT capacity shall be evaluated by performing two SCs according to 6.2.

Vibration

8.3

The test shall be performed in accordance with IEC 60068-2-64: 2008, Tables 20 to 23, or according to a test profile determined by the customer and verified to the vehicle application. The given test parameters are valid for DUT designed for mounting on sprung masses (vehicle body) of a vehicle. The DUT shall be mounted on a shaker test bench according to the designed vehicle mounting

position and according to the requirements given in IEC 60068-2- 47.

The vibration test shall be performed in a sequence of all three spatial directions, if not otherwise agreed between the customer and supplier, starting with the vertical direction (Z), followed by the transverse direction (Y) and, finally, with the longitudinal direction (X).

The mechanical stresses acting on the DUT are specified by a stochastic acceleration: time function with a test duration per spatial direction of 21 h. The test duration per spatial direction may be reduced to 15 h if the test procedure is performed with two identical DUT, or to 12 h if the test procedure is performed with three identical DUT. For this, one test spectrum between 5 Hz and 200 Hz is defined for each spatial direction as the desired PSD for the vibration controller (PSD_vertical_Z, PSD_horizontal _transverse_Y,PSD_horizontal_longitudinal_X). If the DUT is designed for a vehicle mounting position below the vehicle passenger compartment, the reduced spectrum PSD_horizontal transverse_YPassenger_compartment_bottom according to Table 22 shall be used. In case of any doubt, the supplier and customer shall agree which transverse Y profile shall apply.

Mechanical shock

8.4

The test shall be performed in accordance with ISO 16750-3, Table 26 (below) or according to a test profile determined by the customer and verified to the vehicle application.

Acceleration from the shock in the test shall be applied in the same direction as the acceleration of the shock that occurs in the vehicle. If the direction of the effect is not known, the DUT shall be tested in all six spatial directions.

Table 26 — Mechanical shock test — Parameters

Procedure Requirement

Operating mode of DUT

(see ISO 16750-1)

mode 3.2

Pulse shape half-sinusoidal

Acceleration 500 m/s2

Duration 6 ms

Temperature Troom

Number of shocks 10 per test direction

Before mechanical shock testing, the DUT capacity shall be evaluated by performing two SCs according to 6.2. Adjust the SOC with a 1 C discharge to 50 % before starting the mechanical shock profile. Operating mode shall be the continuous monitoring of temperatures and voltages of all available measuring points of the DUT. After mechanical shock testing, the DUT capacity shall be evaluated by performing two SCs according to 6.2.

Short-circuit protection

9.2

The DUT shall be at Troom, fully charged and under normal operating conditions (main contactors are closed, battery systems are controlled by the BCU). An appropriately sized conductor of (100 ⁺⁰ _-40 )mΩ shall be used to apply a “hard short” in less than 1 s for 10 min, or until another condition occurs that prevents completion of the test (e.g. component melting). The test shall be performed with integrated passive and non-passive short-circuit protection devices operational.

After the DUT has been shorted as described above, the observation of the DUT shall be continued for 2 h.

All functions of the DUT shall be fully operational as designed during the test. At pack level, the overcurrent protecting device (e.g. fuse) shall interrupt the short-circuit current. At system level, the short-circuit current shall be interrupted by the overcurrent protecting device (e.g. fuse) and/or by an automatic disconnect by the main contactors.

Overcharge protection

9.3

The DUT shall be at Troom, fully charged and under normal operating conditions with the cooling system operating (main contactors are closed, battery system is controlled by the BCU). The test shall be performed with integrated passive circuit protection devices operational. Active charge control of the test equipment shall be disconnected.

⎯ The DUT shall be charged at a constant current rate which is agreed by the supplier and customer. The recommended constant charge current should be 5 C.

⎯ The upper limit for the power-supply voltage should be set not to exceed 20 % of the maximum battery system voltage.

⎯ Charging shall be continued until the DUT interrupts the charging by an automatic disconnect of the main contactors.

⎯ The overcharge test shall be terminated if the SOC level is above 130 % or cell temperature levels are above 55 °C. Limits for SOC and DUT cell temperature levels for terminating the overcharge protection test may be agreed between the supplier and customer. Data acquisition/monitoring shall be continued for 1 h after charging is stopped. All functions of the DUT shall be fully operational as designed during the test. The BCU shall interrupt the overcharge current by an automatic disconnect of the main contactors in order to protect the DUT from further

related severe effects.

Overdischarge protection

9.4

The DUT shall be at Troom, fully charged and under normal operating conditions with the cooling system operating (main contactors are closed, battery system is controlled by the BCU). The test shall be performed with integrated passive circuit protection devices operational. Active discharge control of the test equipment shall be disconnected.

⎯ Perform a standard discharge. If the normal discharge limits are reached, discharging with 1 C rate shall be continued.

⎯ Discharging shall be continued until the DUT interrupts the discharging by an automatic disconnect of the main contactors.

⎯ The discharge test shall be terminated manually if 25 % of the nominal voltage level or a time limit of 30 min after passing the normal discharge limits of the DUT have been achieved. Values for time and voltage limits for terminating the overdischarge protection test may be agreed between the supplier and customer.

NOTE Nominal voltage is the voltage given by the supplier as the recommended operating voltage of their battery system. Voltage depends on chemistry, cell numbers and arrangement of cells.

Data acquisition/monitoring shall be continued for 1 h after discharging is stopped.

All functions of the DUT shall be fully operational as designed during the test. The BCU shall interrupt the overdischarge current by an automatic disconnect of the main contactors in order to protect the DUT against further related severe effects.