DSH 384 Lithium Cell Protection

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DSH 384 " E# S' R. v6 F4 T4 m

Lithium Cell Protection % \4 Z7 p- k* B$ ?( [' r$ i

4.3.21

60950(ed.2)

+ I/ g2 w: }- x. {Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
Page 1(1)
Subject: Lithium Cell Protection Key words:
-Lithium Cell
; m- _- M6 h  R% C" |$ p-Clearances
& ^: |% a6 I' Y- failure mode
* O: M) d5 `/ C: g! e$ @Provisional Decision taken by ETF2
and to be approved by CTL at its
: V' M& h0 Q1 s38th meeting, in Toronto
Question:
' [* B. i: x1 {5 }. ^9 I! n; ~, yClause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
or forced discharge if this would result in a hazard. Conventionally a combination of resistor, diode
7 |+ K# w/ T+ W! U# v6 o6 {or ic has been considered suitable and is for the series current path. However, a new consideration
9 G- v& d+ s+ d$ vhas 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
  ~- Y+ X! T3 q; s9 Wfor Reinforced separation?
If that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
to transient over voltage). This is based on the fact that creepage cannot be less than clearance and
creepage can be calculated to be, for example at +5V, 0.4mm (based on rounding up 0.12mm to
0.2mm for Basic and doubling for reinforced.
$ A& r1 [: n+ v7 G5 w1 Y0 D! p% aDecision:
Operational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
(see 1.2.9.1)
3 c0 Q" ]4 w3 A& X$ Q5 c6 ^Care should be taken by determining clearance and creepage distances which column of the table has
5 i+ |1 w( Y& v0 Zto be used.(Transients have to be taken into account)

& J6 |' d0 @" _9 f