DSH 384 Lithium Cell Protection

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DSH 384 6 ?- I! r* c) A7 o; \. d0 ?) I

Lithium Cell Protection

4.3.21 0 E2 S# m5 X& |9 u" H- H+ N

60950(ed.2) 8 H! c" b8 h4 I. ]: n5 E6 u

9 b- x9 Q( G' C1 h1 yStandard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
Page 1(1)
) U/ W+ y) T9 l6 D7 T; [Subject: Lithium Cell Protection Key words:
4 m3 Z& E* N# C. p-Lithium Cell
" i2 p3 x4 L2 a- [0 W3 C& v+ `-Clearances
4 B. ]) b" @. W( g- failure mode
2 F" B. p& A) p% SProvisional Decision taken by ETF2
and to be approved by CTL at its
38th meeting, in Toronto
! r1 W9 Y7 \$ B  k9 P  C+ {. rQuestion:
# l8 A" N2 ?: z  w+ `Clause 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
$ P6 U, ~- o' ]or ic has been considered suitable and is for the series current path. However, a new consideration
9 P" i  k# B  O# H& r, i/ p7 Ohas been raised in respect of adjacent tracks, separated by no more than operational insulation, which,
4 [: T7 K" }" ?( |! o9 xunder s/c conditions will bypass the protective series components and provide charging current for
, S1 C( T& X; q1 Weither chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
; M# w+ P8 k* ^# h4 Y) rfor Reinforced separation?
4 k) f* S7 ]" E# E2 xIf 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
) v- e0 d) O2 P/ _5 P) V, ocreepage 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.
Decision:
( C7 F  d. ^8 X2 g2 R3 QOperational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
(see 1.2.9.1)
, W- K# u( m# A2 g& F! j5 Z+ y8 rCare should be taken by determining clearance and creepage distances which column of the table has
) B# }& }- @, F+ ~, {7 fto be used.(Transients have to be taken into account)

9 Y! V( Q% R1 w3 ~' T# L