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Proposals to UN transport regulation
Samsung SDI
Oct 2nd 2013
UN test condition proposal
T7. Overcharge test
 Concern
- Wording for purpose of overcharge test can mislead to conduct the test even for battery
without overcharge protection.
- Purpose of Overcharge test is to check whether the protection works properly.
And this is why the standard doesn’t requires the test on batteries without protection.
 Proposal
- Purpose : The test evaluates the overcharge protection works properly in a
overcharge condition.
Page 2
UN test condition proposal
T7. Overcharge test
 Concern
- Charging current “manufacturer recommended max continuous charge current x 2”
can be severe comparing other int. standards.
- And this results permissible max charge current to be lower.
Test
T7
Overcharge
Condition
UN
Severity
SAE
J 2464
IEC
62660-2
Current
Max charge current X 2 1)
>
1C rate
1C rate
Max Voltage
Max charge voltage x 1.2
≤
Max charge
voltage x 1.2
Maximum working
voltage X2
Duration
24hrs
>
200% SOC (1hr)
200% SOC (1hr)
1) Nominal charge current for EV/PHEV is 1C.
Reducing the charge current for safety purpose makes charging duration longer.
 Proposal
- Overcharge test current to be Max charge current (x1)
Page 3
UN test condition proposal
T4. Mechanical shock test
Test
T4
Mechanical
shock
Condition
Small
Acceleration
150gn
Duration
6ms
Repeat
3times/direction
(totally 18times)
Large
Small vs Large
Cell : 500g
Battery : 12kg
 Concern
Battery with large cells will weigh more than a large cell.
Test condition mismatch. For example, large cell in a small battery
 Considerations
Case1 : to simulate real car crash
- No need to separate test condition for small and large batteries.
Case2 : to simulate drop in manufacturing or logistics process.
- Batteries composed of large cells will weigh more than a single large cell.
Transportation process used to be limited by the weight of product.
Transportation condition of heavy/large will not be severe than light/small one.
 Proposal
Batteries which is composed of large cells to be classified as Large battery.
Page 4
50gn
11ms
3times/direction
(totally 18times)