Lithium polymer battery, venting and CE Marking

[FrancoisB]

Hello,
we are designing Bluetooth earphones and I have a question regarding electrical safety.
Our bluetooth earphones is composed of a neckband to which two earbuds are connected.
There is a lithium polymere battery (~100 mAH) in the neckband. I was wondering whether in EN 62368 (or in any other norms required for CE Marking) it is required to have some venting ? By venting I mean that the case around the battery should not be fully closed, but should allow air to flow in and out.
Any idea about this ?
Thank you a lot for you help

 

[Benjamin Weber]

In IEC 60601-1 for medical electrical devices venting is required if the accumulation of gases could lead to an unacceptable risk (e.g. explosion due to hydrogen).

I am not sure, but I think venting is also an issue in IEC 62133 for lithium batteries.

 

[FrancoisB]

Thank you for your response. I indeed had heard about the necessity to have some venting for medical devices, but I don't know whether this is also required for consumer electronic devices.
I don't see any venting in earphones made of a neckband. The battery casing is usually fully closed, but I know it doesn't mean that it is the right way to do.

 

[CharlieUK]

There's nothing in EN 62368-1 that mandates venting the battery, but the battery will need to be compliant with IEC 62133 - preferably from an IECEE CB scheme lab with CB certificate (this is not compulsory, but shows that the lab has had additional vetting of its competence and that the report has been reviewed by a competent 3rd party)

 

[FrancoisB]

Ok great, thank you a lot for your very valuable help!