DSH 384 Lithium Cell Protection

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DSH 384 ' s9 c5 G: ]  Z* Z4 Y * @" A+ L* m) ^4 i

Lithium Cell Protection % S* v' s# a6 ^' x3 S* Q+ P

4.3.21 9 I0 {* R5 Q# m) i  x) J! K

60950(ed.2) 4 b' Z& _; ]) e; G/ s3 C  l

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
Page 1(1)
Subject: Lithium Cell Protection Key words:
-Lithium Cell
. A7 X, K# Y: i3 }7 v-Clearances
- failure mode
Provisional Decision taken by ETF2
1 u- F2 N4 C0 S) d! F# Z2 Nand to be approved by CTL at its
38th meeting, in Toronto
Question:
8 t: q1 h5 r6 `3 e2 K4 wClause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
* e) n) J. `0 G* Uor 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,
7 R$ P( K( q5 g7 N  zunder s/c conditions will bypass the protective series components and provide charging current for
- Q/ i; M3 I: E: s& |8 t1 Eeither chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
" R& _& V* V/ G$ ]" u7 Z( k* c& Tfor 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.
Decision:
4 n. p% I. P2 r6 l+ g& X: MOperational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
$ ?+ s! v5 U" F(see 1.2.9.1)
5 ^  Q1 w3 s  o0 z! _Care should be taken by determining clearance and creepage distances which column of the table has
7 _: U; n# Z/ ~( x1 a! v  Xto be used.(Transients have to be taken into account)
8 U# p3 G$ \% t) \; W+ {
$ |& O1 R* B3 m: e# N7 j/ [
' `( m0 q; r6 `8 i2 v