DSH 384 Lithium Cell Protection

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DSH 384 8 y1 M, i; {1 c0 i

Lithium Cell Protection

4.3.21 : z: k+ J; ?+ G3 N5 G, a6 G7 F8 ]

60950(ed.2) : [. O  d2 U- J- k7 y' P: J

! O- G9 V; X! ^Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
Page 1(1)
. b1 G  j( v6 E' oSubject: Lithium Cell Protection Key words:
7 {3 c# h" y7 u6 @-Lithium Cell
' J. {, v) g) W-Clearances
- failure mode
1 G' [5 l) a% \* IProvisional Decision taken by ETF2
/ o" z, {8 `+ t+ c5 j4 b% O8 A% Kand to be approved by CTL at its
# n, A/ d# e4 M/ o, }; M38th meeting, in Toronto
Question:
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
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,
under s/c conditions will bypass the protective series components and provide charging current for
  j) k: p7 y- B& l7 o! t' @" L0 ieither chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
for Reinforced separation?
4 u! ^& d. _- dIf that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
. x# _& y& m6 q& x2 Vto 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:
3 t. i* ^4 Z3 J. \9 v, g% ZOperational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
& D- O7 S. _$ ~  O* n, K$ m(see 1.2.9.1)
$ Z% d' s8 S: H3 FCare should be taken by determining clearance and creepage distances which column of the table has
* l0 B1 d0 |8 {to be used.(Transients have to be taken into account)
  W; O4 W2 u# K. [; a( O