DSH 384 Lithium Cell Protection

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DSH 384 7 g7 Y) V. g/ ?

Lithium Cell Protection

4.3.21 ' Z% h  f# T0 F( g& ^. W

60950(ed.2)

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
8 O7 Z2 f& u8 OPage 1(1)
Subject: Lithium Cell Protection Key words:
( y9 H2 N' U0 _4 {+ ?7 e; _1 c-Lithium Cell
5 s: y7 j' W* x9 K: N. ?-Clearances
/ f- v3 g$ v/ q1 ^- failure mode
Provisional Decision taken by ETF2
and to be approved by CTL at its
$ g, T$ c! B* ]0 b6 p38th meeting, in Toronto
; w: J0 a3 X3 l) a" ^& BQuestion:
1 W1 t5 P" E& X( D0 q! r  MClause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
- _2 a1 J: m" }) e+ Hor forced discharge if this would result in a hazard. Conventionally a combination of resistor, diode
. W# t& P' X' k3 O# wor 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
1 u+ K6 {2 G, }& nfor Reinforced separation?
9 z% c: [0 y" L  nIf that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
' g6 X+ n1 ^/ P* ]  g& g5 ^to transient over voltage). This is based on the fact that creepage cannot be less than clearance and
$ N( H3 T. W: U6 H3 }3 Bcreepage can be calculated to be, for example at +5V, 0.4mm (based on rounding up 0.12mm to
& g4 K1 x+ E, h3 U, I9 }& S8 [0.2mm 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.
; Y: e% l' n6 {; A- _# I% F1 p(see 1.2.9.1)
/ N$ L- N' h; h3 F1 v2 nCare 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)

7 U( T3 |. b7 G# L