EN 1987-1-1997 pdf download.Electrically propelled road vehicles Specific requirements for safety Part 1: On board energy storage.
6.3 Creepage distance
This subclause deals with additional leakage current hazards between the cotuiection terminal of a battery module inchl(ling any COfl(IUCtiVe fillings attached to them and any exposed conductive l)lS, (tue to the risk of electrolyte spillage or leakage.
It does not, apply to fully sealed batteries, for which the (letermination of the creepage (listanec is made in accordance with III) 366: 1977.
The creepage distance (see figure 6) is the shortest distance from a live lart of one terminal including any conductive fittings attached to it, to the electrical chassis, along insulated surface, or between two live parts of connection terminals that are of (lifferdnt potential. If electrolyte leakage can occur, the creepage distance shall be as follows:
a) Case of a creepage distance between two connection terminals:
dO,25U+5 (3)
where:
d is the creepage distance measured on the tested battery, in millimetres;
U is the theoretical nominal values between the two live part terminals.
b) Case of creepage distance between live parts and the electrical chassis:
(4)
where
(1 LS the cree)age distance measure(l between the live Part an(l any e3qx)se(1 conductive part in millimetres;
6.4 Ventilation
6.4.1 General
To prevent explosion, fire or toxicity hazards, the following actions shall be respected when gases can be produced by the battery:
— no potentially dangerous accumulation of gas generated by the battery is allowed anywhere in the vehicle;
– no potentially dangerous quantity of gas generated by the battery is allowed in the passenger compartment or the enclosed load space.
An example of air flow calculation for hydrogen exhaust is given in annex B, together with some basic chemical rules.
6.4.2 Tests and requirements
6.4.2.1 Test and ?rquilvinenl for hydrogen To ensure that the critical level of hydrogen inflammability has not been reached anywhere, the following test has to be applied.
When charging the vehicle, the hydrogen concentration shall be measured outsi(le a volume specified by the vehicle manufacturer around every gas exhaust.
No ignition point shall be located inside the volume specified by the vehicle manufacturer around gas exhausts.
NOTE 1. The possible ignition points are:
— elect ncai contacts;
– fuses;
– contact brushes;
— brake pads;
– electrostatic discharge;
possible external source e.g. cigarette, lights, etc.
During the test, the recorded values of hydrogen concentrations outside these specified volumes shall
— less than 0,8 % in case of a normal running of the vehicle (driving, charging, etc.) inside and outside the vehicle;
— less than 3,5 % in the case of a first, failure insi(le and outside the vehicle.
NOTE 2. A first failure can be:
— a failing ventilauon device (inside the vehicle). Then, a sufficient natural ventilation shall avoid a dangerous concern ration of hydrogen being reached;
— damage of the charger. Then, either the charger is fitted with safety devices and stops, or a forced ventilation shall be provided;
— release of battery connection terminal;
— disconnection of a gas exhaust tubing. etc.
6.4.2.2 Tests and irqithrments Jbr other gases
NOTE. Along with development of new battery technologies, tests and associated requirements will be defined in future revisions of this standani
6.5 Chemical hazards
Under normal conditions, no chemical reactant shall escape froni the battery in potentially dangerou.s quantity.
Under abnormal leakage of liquid, spray or vapour, conseqtiences shall be reduced to a minimum, especially in the passenger compartment..
6.6 Inter-battery modules liaison
1hkhig into account the environment of the battery, special attention shall be called to the connection operation of inter-battery modules (tight exüng, sealing, etcj.The battery manufacturer shall supply all recommendations to these connect ion operations, to satisfy the environmental requirements of the vehicle manufacturer (vibration, mechanical shocks, thermal shocks).
7 Over-current battery switch
7.1 Function
The over-current battety switches have an independent safety function from the other equipment of 11w propulsion system. They shall open the battery current circuit, when an overstepping of the Imuts of a normal running occurs.
These current oversteppmgs can have two origins:
— failure in the drive system;
— short-circuit of the battery or battery pack
7.2 Assembly requirements
All the over-current switches are potential ignition
sources. They can be either a discrete component
(e.g. fuse), or an equivalent system.EN 1987-1-1997 pdf download.

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