DSH 384 Lithium Cell Protection

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DSH 384 8 N% v1 b& ?6 } 8 Q- r! h( Q' k6 @  \2 v

Lithium Cell Protection

4.3.21 3 g/ t; k& h" U! t( \

60950(ed.2)

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
) Y2 ^9 v7 D* a+ a, a/ a% o; iPage 1(1)
- I) X$ }  e' |Subject: Lithium Cell Protection Key words:
) Z- m$ l! i% k2 S" B1 h-Lithium Cell
-Clearances
- failure mode
Provisional Decision taken by ETF2
$ |1 K7 r5 g, o* Kand to be approved by CTL at its
38th meeting, in Toronto
Question:
4 W% E8 @  D' o$ h: i( TClause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
7 X  G1 R$ F+ X1 b! Tor forced discharge if this would result in a hazard. Conventionally a combination of resistor, diode
or ic has been considered suitable and is for the series current path. However, a new consideration
has been raised in respect of adjacent tracks, separated by no more than operational insulation, which,
under s/c conditions will bypass the protective series components and provide charging current for
either chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
for Reinforced separation?
If that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
& C% q: I& f6 G  K) S4 r* H" ]to transient over voltage). This is based on the fact that creepage cannot be less than clearance and
) l# R. {7 u. e2 W) y! A% N& Qcreepage can be calculated to be, for example at +5V, 0.4mm (based on rounding up 0.12mm to
" Z- I4 d( g/ j% \- a" E0.2mm for Basic and doubling for reinforced.
Decision:
Operational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
" M: p. m9 u+ `(see 1.2.9.1)
Care should be taken by determining clearance and creepage distances which column of the table has
to be used.(Transients have to be taken into account)

& `5 z, y/ H/ L6 K* ?& r4 v9 q
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