DSH 384 Lithium Cell Protection

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DSH 384 ! J- D5 \, |2 B: t $ `2 k' G: [+ Q$ T# s# c; v

Lithium Cell Protection 0 Z) a8 J5 y. l4 }" A

4.3.21 7 K9 k% p, y3 o! M5 O+ b- L

60950(ed.2)

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
/ b) w0 O5 }* o, b% K4 i5 t3 kPage 1(1)
Subject: Lithium Cell Protection Key words:
-Lithium Cell
& s6 O/ j$ F( k, T. n2 R. o-Clearances
& E* k2 o$ A) h0 c/ t' }$ l- failure mode
Provisional Decision taken by ETF2
and to be approved by CTL at its
38th meeting, in Toronto
Question:
Clause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
( f! a2 G4 B: n3 o. y0 h# n# ]or 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
7 v* D1 G: m  w4 `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
, n$ d. d" c- J3 G- zfor 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
) C  m5 F; n  _* ^/ Y0.2mm for Basic and doubling for reinforced.
- q! J* k- a, z1 d) p$ g$ PDecision:
( r# @/ b! a  K3 J' A" EOperational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
(see 1.2.9.1)
. T! _; X5 a+ X) o! W/ jCare should be taken by determining clearance and creepage distances which column of the table has
" R9 p% }- h  dto be used.(Transients have to be taken into account)
' V: Z6 I. B9 m$ w9 }7 h; W1 C
, ^* Z1 v: C4 b- X4 N. _/ y5 W