DSH 384 Lithium Cell Protection

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DSH 384 - A1 B) P! z  s' w: S7 B. D

Lithium Cell Protection - {; O6 @! }  O0 X  ?; \1 z

4.3.21

60950(ed.2)

  s6 J5 ]% X, I- T; L0 tStandard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
1 n! N* ^* N1 @Page 1(1)
1 I+ r: H% [* @3 D* Z  [" Q' ?  ^  ySubject: Lithium Cell Protection Key words:
+ |" f" ]& i; |-Lithium Cell
-Clearances
6 a& n) F- C" \  q8 g- failure mode
# x$ q, g+ i6 o; i/ F! lProvisional Decision taken by ETF2
and to be approved by CTL at its
38th meeting, in Toronto
- r" P7 E9 _  m" ]( A/ }Question:
; F5 r. x% `8 a! oClause 4.3.21 requires that two levels of protection are required to prevent forced or reversed charge
4 a+ M+ T& e; C9 O) t: `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
has been raised in respect of adjacent tracks, separated by no more than operational insulation, which,
  r0 K6 v! z- D1 z: R( {under s/c conditions will bypass the protective series components and provide charging current for
. D! ~5 w# `) r8 i4 v/ J* @$ jeither chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
for Reinforced separation?
# U8 d6 G. H+ D9 u4 t1 eIf 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
. H6 H' M, w$ M3 Y% V0.2mm for Basic and doubling for reinforced.
Decision:
, j, l5 A( F( L; TOperational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
  W0 {* y! U3 h" ~(see 1.2.9.1)
Care 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)


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