DSH 384 Lithium Cell Protection

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 384 " B/ o. g9 ?7 `8 e; t0 ~. E* m+ L

Lithium Cell Protection ' m) K# |8 J! Y4 g

4.3.21

60950(ed.2) 5 l- m- y% V1 Q1 T

Standard: IEC60950, 2nd Clause: 4.3.21 Sheet n. P384
0 o9 b; j  ?/ i9 O0 |5 iPage 1(1)
Subject: Lithium Cell Protection Key words:
-Lithium Cell
-Clearances
; x5 Y4 E* ]. W5 \- failure mode
Provisional Decision taken by ETF2
and to be approved by CTL at its
' {- D. E# `6 @, b! ?# ~+ H8 x38th 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
' c$ W& ~9 _0 P$ ]7 |5 c& weither chargeable or non-rechargeable batteries. Does this mean that there is therefore a requirement
for Reinforced separation?
If that is the case, then the controlling factor is the clearance of 0.8mm in Table 5 (circuits not subject
+ J  a0 j; E8 x; Ito 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.
* Z/ ?) e. v( B" m9 c' jDecision:
Operational insulation is suitable taking into account 5.4.4 because there is no risk of electric shock.
4 L1 u! ?& Q- X(see 1.2.9.1)
% A1 g. c+ ~8 z' X0 OCare 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)