Battery fuel gauges

Accurate gauging products for any battery system

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We offer highly accurate gauges for applications ranging from smartphones, notebooks and power tools to vacuums and energy storage systems (ESS). There are gauges equipped with integrated protection or for higher voltage applications up to 15 cells in series. Our patented gauging algorithms help gauges accurately measure state of charge and state of health for a variety of chemistries including li-ion, LiFePO4 and NiMH.

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Find your battery fuel gauge

BQ27Z758
Battery fuel gauges

1-series impedance track battery fuel gauge and protection with true 0V charging

Approx. price (USD) 1ku | 0.8

BQ41Z50
Battery fuel gauges

2-4 series Li-ion highly integrated battery fuel gauge and protector

Approx. price (USD) 1ku | 1.92

Getting started with Impedance Track™ technology for battery gauging

Learn what battery gauging is and why you need it

It's imperative that you know the remaining capacity in your battery-powered devices, from mobile phones to vacuum cleaners to electric vehicles. Our battery gauges can provide your system with accurate state-of-charge and state-of-health information, extending battery run time and reducing dead battery anxiety.

Application note
Battery Gauging Algorithm Comparison
This application note compares algorithms including voltage correlation, voltage and internal resistance correction, Coulomb counting, compensated end-of-discharge voltage (CEDV) and Impedance Track technology.
PDF | HTML
Application note
Choosing Between Battery Gas Gauges & Monitors to Track Charge Availabilility
The intent of this application report is to provide information about our product families when selecting a battery gas gauge solution.
PDF
Application brief
Benefits of Battery Gauges and Protectors in Medical Applications
The industrial field is rapidly changing, and there is a growing need for accurate battery-management solutions in the medical sector.
PDF | HTML
Featured products for Impedance Track battery gauges
BQ27Z746 ACTIVE Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector
BQ40Z50-R2 ACTIVE 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
BQ34Z100-R2 ACTIVE Multichemistry Impedance Track™ stand-alone fuel gauge

Deep dive into Impedance Track technology

Learn more about the Impedance Track battery gauging algorithm and how it works. Impedance Track technology uses many different factors to calculate state of charge, including depth of discharge (DOD), total chemical capacity (Qmax), internal battery resistance dependence on DOD, current load and temperature.

Video
Deep dive into TI's Impedance Track technology
This video will explain how system behavior and cell modeling impact accuracy, and how to fine-tune gauges for a particular application to predict cell capacity with reasonable accuracy.
Blog
Impedance Track frequently asked questions (FAQ) home page
This is the home page for common Impedance Track questions.
Application note
Evaluation 3: Theory/Implementation Impedance Track Battery Fuel-Gauging Algo (Rev. B)
This application note reviews an implementation of the Impedance Track algorithm in our bq20z8x family, and setting the data flash constants associated with the fuel-gauging algorithm.
PDF
Featured products for Fuel gauges
BQ27Z746 ACTIVE Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector
BQ40Z50-R2 ACTIVE 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
BQ34Z100-R2 ACTIVE Multichemistry Impedance Track™ stand-alone fuel gauge

Get started with BQStudio

BQStudio offers a full suite of tools to assist with the process of evaluating, designing with, configuring, testing or using our battery-management products. Learn more about how to use BQStudio here.

Video
Introduction to BQStudio and TI tool chain for gauge evaluation
This document describes the recommended steps for troubleshooting problems with gauges that use Impedance Track technology.
Application note
Information to Provide When Reporting Issues With TI Gauges
This document describes the recommended steps for troubleshooting problems with Impedance Track gauges.
PDF

Learn how to perform a learning cycle

Ensuring the accuracy and performance of a battery gauge requires the completion of an initial optimization cycle, also known as learning cycle. Typically performed on a single representative battery pack during the development stage, the resulting values are programmed into every pack during mass production. There should be minimal pack-to-pack variation in a well-controlled manufacturing process. The flash image extracted from a "golden pack" during development is called the "golden file" and is used in mass production.

Application note
Impedance Track Gauge Configuration For Dynamic Loads (EPOS)
This application note discusses various options to tune the algorithm for dynamic loads. It is intended to help engineers configure a gauge that uses Impedance Track technology.
PDF
Application note
Gauge Communication
This application note explains how programming battery gauge parameters requires access to data memory, with examples of how to read gauging results.
PDF

Learn how to optimize your battery gauge performance

It is only through correct configuration that you can obtain the best performance from Impedance Track technology-based battery gauges. The two major steps in configuring a gauge are programming the correct chemical ID (ChemID) and performing a learning cycle.

User guide
Simple Guide to CEDV Data Collection for Gauging Parameter Calculator (GPC) (Rev. B)
The gauging parameter calculator (GPC) is a math calculation and simulation tool that helps you obtain matching compensated end-of-discharge voltage (CEDV) coefficients for a specific battery profile.
PDF
User guide
Golden GG Maker and Resistance Temperature Compensation Optimizer
This user's guide is designed as a simple guide for the GPC golden gauge configuration (GG) maker tool. The document includes a summary of the tool, requirements, how to submit data and examples.
PDF
Application note
Impedance Track Gauge Configuration For Dynamic Loads (EPOS)
This application note discusses various options to tune the algorithm for dynamic loads. It is intended to help engineers configure an Impedance Track technology-based gauge.
PDF

Helpful resources

Now that you have performed your learning cycle and configured your Impedance Track technology-based battery gauge, it's time to go to production.

Application note
Gauge Communication
This application note explains how programming battery gauge parameters requires access to data memory, with examples of how to read gauging results.
PDF
Application note
Information to Provide When Reporting Issues With TI Gauges
This document describes the recommended steps for troubleshooting problems with gauges that use Impedance Track technology.
PDF
Application note
SMBus Made Simple
The system management bus (SMBus) is the most common form of communication for our advanced fuel gauges. Many customers want to design SMBus engines to communicate with advanced fuel gauges.
PDF | HTML

Technical resources

White paper
White paper
Impedance Track Based Fuel Gauging
What makes our gauges so special? Patented gauging Impedance Track™ technology allows for higher accuracy. If you are interested in learning more about this technology, download this white paper.
document-pdfAcrobat PDF
Application note
Application note
Gauge Communication
Battery gauges have a rich set of parameters that enable compatibility with a wide range of battery types and applications. Learn how to program these parameters and read gauge results.
document-pdfAcrobat PDF
Video
Video
Battery Protector, Monitor or Gauge?
This short overview provides a short summary of system requirements to help you choose a battery protector, monitor or gauge.

Discover featured applications

Medical
Create a safe and long-lasting battery system in medical applications with our battery gauge technology
E-mobility
Know when you need to charge in e-mobility applications with our battery gauge technology
Retail automation & payment
Enable efficient battery usage in retail automation and payment applications with our battery gauge technology
Vacuum robot
Create longer run times and fewer trips back to base with our battery gauge technology

Create a safe and long-lasting battery system in medical applications with our battery gauge technology

Benefits:

  • Protection integrated into the battery gauge increases confidence in battery management system safety while reducing system costs.
  • Features such as the maximum chemical capacity (QMax) allow battery management systems to last as long as safely possible, whether used daily or sitting on a shelf.
  • A maximized battery lifespan through cell balancing prevents any individual cell from becoming over- or under-charged.

Featured resources

REFERENCE DESIGNS
  • TIDA-00553 – Multi-Cell Battery Manager Unit with Integrated Charging, Gauging, Authentication and Protection
  • PMP5722 – Single Cell Battery Power Solution Reference Design
PRODUCTS
  • BQ27Z561-R2 – Impedance track battery gas gauge solution for 1-series cell li-ion battery packs
  • BQ40Z50-R2 – 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
  • BQ35100 – Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor
HARDWARE DEVELOPMENT
  • BQ27Z561EVM-011 – BQ27Z561 1S-cell programmable battery manager Evaluation module
  • BQ40Z50EVM-561 – BQ40Z50 evaluation board 
  • BQ35100EVM-795 – bq35100 Lithium Primary Cell Evaluation Module Using End-of-Service Monitor Gas Gauging
DESIGN TOOLS AND SIMULATION
  • BQSTUDIO – Battery Management Studio (bqStudio) Software

Know when you need to charge in e-mobility applications with our battery gauge technology

Benefits:

  • Built-in authentication prevents the use of any third party or unofficial battery packs, increasing confidence that the system will work as intended.
  • An integrated black-box feature provides lifetime data upon unexpected results.
  • An operating temperature range of -40°C to 150°C ensures reliability in almost any environment

Featured resources

REFERENCE DESIGNS
  • TIDA-010030 – Accurate gauging and 50-μA standby current, 13-S, 48-V li-ion battery pack reference design
  • TIDA-00255 – 15 Cell Lithium Ion Battery Controller Analog Front End Reference Design
  • TIDA-00792 – Multi-Cell 36-48V Battery Management System Reference Design
PRODUCTS
  • BQ34Z100 – 1-s to 16-s Impedance Track™ fuel gauge | battery gas gauge
  • BQ78350-R1A – CEDV li-ion gas gauge and battery management controller
HARDWARE DEVELOPMENT
  • BQ34Z100EVM – Bq34z100EVM 1s to 16s Impedance Track Fuel Gauge Battery Evaluation Module | Gas Gauge Battery
  • BQ76940EVM – BQ76940 evaluation board with BQ78350
DESIGN TOOLS AND SIMULATION
  • BQSTUDIO – Battery Management Studio (bqStudio) Software

Enable efficient battery usage in retail automation and payment applications with our battery gauge technology

Benefits:

  • Precise gauging algorithms ensure the battery's exact state of charge.
  • Single-cell gauges in die size ball-grid array (DSBGA) packaging enables a small footprint.
  • A chemistry-ID system allows for shorter design cycles without sacrificing gauge accuracy.

Featured resources

REFERENCE DESIGNS
  • PMP40496 – 2-cell boost charge system reference design with 5-V USB
  • TIDA-00593 – Single Cell Li-Ion Battery Pack-side Fuel Gauge Reference Design
PRODUCTS
  • BQ27426 – Single cell System-side battery fuel (gas) gauge w/Pre-programmed chemistry Profile
  • BQ28Z610-R1 – Battery fuel gauge with integrated protector for 1-2 series packs
  • BQ27Z561-R2 – Impedance track battery gas gauge solution for 1-series cell li-ion battery packs
HARDWARE DEVELOPMENT
  • BQ27426EVM-738 – BQ27426 EVM for Impedance Track Fuel Gauge w/Easy to Use Pre-programmed Chemistry Profiles
  • BQ28Z610EVM-532 – BQ28Z610 1-Cell to 2-Cell Programmable Battery Manager Evaluation Module
  • BQ27Z561EVM-011 – BQ27Z561 1S-cell programmable battery manager Evaluation module
DESIGN TOOLS AND SIMULATION
  • BQSTUDIO – Battery Management Studio (bqStudio) Software

Create longer run times and fewer trips back to base with our battery gauge technology

Benefits:

  • ±1-mV gauging accuracy enables longer run times and fewer trips back to base.
  • Built-in authentication prevents the use of any third party or unofficial battery packs, increasing confidence that the system will work as intended.
  • Maximized battery lifespan through cell balancing prevents any individual cell from becoming over- or under-charged.

Featured resources

REFERENCE DESIGNS
  • TIDA-00883 – 1 to 4 Series Cell Li-Ion Battery Pack Manager Reference Design
  • TIDA-00553 – Multi-Cell Battery Manager Unit with Integrated Charging, Gauging, Authentication and Protection
PRODUCTS
  • BQ40Z50-R2 – 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
  • BQ4050 – 1-4 series CEDV battery fuel (gas) gauge
HARDWARE DEVELOPMENT
  • BQ40Z50EVM-561 – BQ40Z50 evaluation board 
  • BQ4050EVM-561 – 1 Series, 2 Series, 3 Series, and 4 Series Li-Ion Battery Pack Manager Evaluation Module
DESIGN TOOLS AND SIMULATION
  • BQSTUDIO – Battery Management Studio (bqStudio) Software

Design & development resources

Application software & framework
Battery Management Studio (bqStudio) Software

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Calculation tool
Gauging Parameter Calculator
Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over (...)
Support software
MathCAD compensated end of discharge voltage (CEDV) tool

Math calculation and simulation tool that helps the battery designer to obtain matching CEDV coefficients for the specific chemistry in the battery pack using one of TI’s CEDV algorithm based fuel gauge. It accepts 3 pairs of log files that can be created by using TI’s bq Smart Battery Builder (...)

Reference designs related to Battery fuel gauges

Use our reference design selection tool to find designs that best match your application and parameters.