Datasheet > IEC62281

IEC62281

更新时间： 2024-11-06 12:23:15

品牌	Logo	应用领域
力特 - LITTELFUSE		电池
页数	文件大小	规格书
8页	1914K
描述
Introduction to Li-ion Battery Technology

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IEC62281 数据手册

Application Note:

Use of Low Resistivity Surface Mount PPTC

in Li-ion Polymer Battery Packs

This is why LIBs have several levels of fail-safe internal

Introduction to Li-ion Battery Technology

cell level and external protection circuitry, which shuts

down the battery pack when parameters go out of

range. The addition of this protection circuitry takes up

useful space in the battery pack and cell, thereby

reducing the available capacity. It also causes a small

current drain on the pack and contributes to potential

points of failure, which can permanently disable the cell

or pack.

Lithium-ion batteries (LIB) have now become part of

the standard battery pack of choice used in most

notebook, smartphone, e-reader, and tablet designs.

The LIB chemistry produces optimal characteristics

with regard to high energy density, low self-discharge,

light weight, long cycle life, lack of memory effect, and

low maintenance. LIBs are now gaining popularity in

other market segments such as electric vehicles,

power tools, and military/aerospace applications. Since

the technology was developed in the 1970s, LIBs have

improved dramatically in terms of energy density, cost,

durability, and safety.

Internal cell protection consists of a shut-down separator

(for over-temperature), tear-away tab (for internal

pressure), vent (pressure relief), and thermal interrupt

(over-current/over-charging) (Figure 1).

Current

Collector

Sealing Plate

The three main functional components in a lithium-ion

battery cell are the anode (typically graphite), the

cathode (typically lithium cobalt oxide), and a non-aque-

ous electrolyte (typically a lithium salt or organic

solvent containing complexes of lithium ions). The

material choices affect a cell’s voltage, capacity, life,

and safety.

Vent Plate

Positive Cap

Negative Teminal

Gasket

Gas Release Vent

Current Interrupt Device

Insulation Plate

Spacer

Positive

PTC

Tab

Device

Separator

Sealing Cap

Inlet

Gasket

Separator

Positive

Electrode

Insulator

Positive

Electrode

Negative

Electrode

Casing

Negative

Electrode

Negative

Tab

Case

(Positive Polarity)

Li-ion cells are available in a cylindrical solid body,

prismatic semi-hard plastic/metal case, or pouch form,

which is also called Li-polymer. Although pouch cells

and prismatics have the highest energy density, they

require some external means of containment to

prevent an explosion when their State of Charge (SOC)

is high (see Figure 1).

Anode tab

Cathode tab

Negative

Tab

Separator

Top insulator

Anode

Tab Sealant

Positive Tab

Positive

Negative

Electrode

Cathode

Electrode

Tab Sealing

Area

Barcode

Al laminate ꢀlm

Side Folding

Overheating is the main safety concern for lithium-ion

cells. Overheating causes thermal runaway of the

cells, which can lead to cell rupture, ꢀre, or explosion.

A deep discharge event could cause internal shorts in

the cell, which would cause a short circuit upon

charging.

Laminated

Foil

Figure 1. Various Li-ion cell conꢀgurations

Over-charging and deep discharge/short-circuit events

create heat (generated by the anode of the cell) and

oxygen (created by the cathode). Both of these effects

can be dangerous to the cell and cause bloating (in the

case of Li-polymer pouch cells), rupture, ꢀre, or even

an explosion.

Over the last ꢀve years, LIBs have been the subject of

highly publicized recalls of notebook and cell phone

battery packs, as a result of instances of overheating,

ꢀre, and rupture. Several new standards from IEC, UL,

and the DOT/UN have emerged to specify required

safety measures and testing.

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中文翻译

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与IEC62281相关器件

型号	品牌	获取价格	描述	数据表
IEC-A	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 CONNECTORS
IECA1	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 & MINI IEC CONNECTORS
IEC-A-1	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 CONNECTORS
IECA1080	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 & MINI IEC CONNECTORS
IECA1120	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 & MINI IEC CONNECTORS
IECA1150	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 & MINI IEC CONNECTORS
IECA1200	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 & MINI IEC CONNECTORS
IEC-A-2	ADAM-TECH	获取价格	No
IECA3	ADAM-TECH	获取价格	AC INLET/OUTLET IEC 320 & MINI IEC CONNECTORS
IEC-A-3	ADAM-TECH	获取价格	No

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