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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)