Battery Production and Pack Integration (Strand 2: Electrical/Electronics)

Battery

A device that stores energy in chemical form and releases it as electrical energy through electrochemical reactions.

Chemical Potential Energy

Energy stored in the arrangement of atoms/ions in electrode materials of a battery.

Oxidation

The process that occurs at the anode during discharge, where electrons are released.

Reduction

The process that occurs at the cathode during discharge, where electrons are consumed.

Cell Voltage (V)

The electrical potential difference created by the chemistry of a battery.

Current (I)

The rate at which charge flows in a battery.

Capacity (Q)

The total charge a battery can deliver under specified conditions, expressed in amp-hours (Ah).

Energy (E)

The ability of a battery to do work, approximated as E = VQ.

Power (P)

The rate at which energy is delivered, calculated as P = VI.

Internal Resistance (R_int)

The resistance within a battery that causes voltage drop under load.

Voltage Sag

The drop in terminal voltage under load due to internal resistance.

Thermal Management

Strategies used to maintain a safe and optimal temperature range in battery packs.

Series Connection

A way to connect battery cells to increase the overall voltage.

Parallel Connection

A way to connect battery cells to increase the overall capacity.

Battery Management System (BMS)

A system that monitors and controls battery pack operation to prevent unsafe conditions.

Solid Electrolyte Interphase (SEI)

A thin passivation layer formed on the anode during the formation cycling of lithium-ion cells.

Electrolyte

A liquid or gel that allows the flow of ions between the cathode and anode in a battery.

Separator

A porous insulator in a battery that prevents electronic contact while allowing ionic flow.

Ending-of-Line (EOL) Testing

Tests conducted to confirm batteries meet requirements before shipping or assembly.

Leak Testing

Methods used to detect and prevent the loss of electrolyte from battery cells.

Formation Cycling

A controlled process of charging and discharging to stabilize a lithium-ion cell's chemistry.

Charging Rate

The speed at which a battery can be charged, affecting its lifespan and performance.

Discharge Rate

The speed at which a battery can deliver energy, important for power applications.

Porosity

The measure of how much void space is within a material, affecting ion transport in electrodes.

Active Materials

The chemicals used in the cathode and anode that participate in electrochemical reactions.

Conductive Additives

Materials added to electrodes to improve electrical conductivity.

Binders

Polymeric materials that help hold the active particles together in an electrode.

Capacity Verification

A performance test to ensure a battery can deliver its rated capacity.