Chapter 28 POWERPOINT

Use the textbook to define these Technical Terms:

1. absorbed glass mat battery (AGM battery)-

2. battery acid-

3. battery bank-

4. battery charge indicator-

5. battery eye-

6. battery heat shields-

7. battery hold-down-

8. battery posts / battery terminals-

9. battery temperature sensor-

10. cold cranking rating

11. electrolyte

12. maintenance-free

Use the textbook to answer these discussion questions:

1. Describe the operation of a basic battery cell.

2. Explain how temperature affects battery performance.

Read the chapter summary below:

Summary

■ An automotive battery is an electrochemical device for producing and storing electricity.

■ A simple metal-acid battery cell consists of a negative plate, positive plate, container, and electrolyte (battery acid, lithium paste or gel, or liquid sulfuric acid).

■ A 12-volt battery has six cells, which produce an open circuit voltage of 12.6 volts.

■ Battery cables are large wires that connect the 12-volt battery terminals to the vehicle’s electrical system.

■ Common types of 12-volt batteries include maintenance-free batteries, gel batteries, and AGM batteries.

■ The two most common methods of rating lead- acid storage batteries are by the cold cranking rating and by the reserve capacity rating.

■ As battery temperature drops, battery power is reduced.

■ Many hybrids use a dual voltage system: 12 volts for most of the vehicle’s conventional electrical/ electronic circuits, and high voltage (HV) for the double-ought (00) conductors and HV motor-generator of today’s electric drive trains.

■ An HV battery is made of several battery cells wired in series to produce a high voltage electrical power source.

■ An HV battery ECM is an electronic control circuit that reads signals from HV battery temperature and voltage sensors to prevent battery overheating.

■ An HV battery is so powerful that it is rated in kilowatts (thousands of watts) of electrical energy.

■ Capacitor banks can store electrical energy without an electrolyte, battery acid, or a fuel (hydrogen).

■ Fuel cells are similar to batteries, but require an outside fuel source, usually hydrogen, to generate electricity.

■ A flywheel generator uses the kinetic energy of a high-speed ac armature (flywheel) to store huge amounts of electrical energy.