DSH 384 Lithium Cell Protection

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DSH 384 ) w4 @0 b0 |) }  O5 o9 a

Lithium Cell Protection

4.3.21 & V4 k: v/ }$ U* l

60950(ed.2) 3 e& l/ B; D5 t5 Z

. X9 m: k  V7 h% N- G) nStandard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
Page 1(1)
Subject: Lithium Cell Protection Key words:
-Lithium Cell
-Clearances
* `  _$ Q, |+ @6 ]- s- failure mode
! _  a2 o3 d% k; a& e; z# a9 VProvisional Decision taken by ETF2
and to be approved by CTL at its
38th meeting, in Toronto
+ o. \. A& [) A  O" i% ^: U# IQuestion:
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
6 Y2 ^- {( ]' ?0 Yor 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,
" `5 \* y4 p8 B" O5 B0 t) Bunder 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 L$ u0 P. {7 ffor 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
+ P# x5 m4 d2 ?7 g% V5 @6 s, J0.2mm for Basic and doubling for reinforced.
9 H! z3 X4 h, b" F% qDecision:
6 e1 Q0 t; j1 X, }Operational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
(see 1.2.9.1)
+ s; U5 O9 }& n1 V( kCare 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 k; T! @, F7 m' B4 \
6 [- n4 X  \! Y
- y- w0 L) U7 ^