DSH 384 Lithium Cell Protection

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DSH 384 . }* c; ~( p/ C8 m7 x& k5 F+ y

Lithium Cell Protection ' c5 T* @( ~0 Z  r6 U2 G

4.3.21 ( W% H; `. J' R

60950(ed.2) 2 x$ ?* o9 s- o" M" p8 X1 L

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
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+ d. K& y* S4 V; a2 s; d1 SSubject: Lithium Cell Protection Key words:
$ M0 J! v. n9 i-Lithium Cell
7 ^6 m& }9 q' C$ s4 ^! J6 ?-Clearances
+ J& U- ]1 O- ?" v/ R- failure mode
Provisional Decision taken by ETF2
9 M: f& N5 X/ S" G2 I2 rand to be approved by CTL at its
38th meeting, in Toronto
Question:
4 o( b3 ~& h6 z& m- WClause 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
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,
) x& w7 ~/ h/ e& x. T. [under s/c conditions will bypass the protective series components and provide charging current for
$ Z. R& O2 {& |2 Xeither chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
for Reinforced separation?
7 \* E  A; _8 w7 H% I! G0 EIf that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
$ G- w" ]4 O  p! ^. o4 g) Uto transient over voltage). This is based on the fact that creepage cannot be less than clearance and
* M  I; ]/ ~: A4 ^7 X' F! G2 Kcreepage can be calculated to be, for example at +5V, 0.4mm (based on rounding up 0.12mm to
, h" b( r8 O7 N3 k7 s0.2mm 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.
; a# r% L% E# O: R(see 1.2.9.1)
Care should be taken by determining clearance and creepage distances which column of the table has
" T; R4 f+ J8 w( L$ L7 C. Cto be used.(Transients have to be taken into account)
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