Battery Thermal Analysis Services

Battery Thermal Analysis (BTA) encompasses a suite of scientific methodologies, experimental techniques, and numerical simulation tools designed to quantify, predict, and optimize the thermal behavior of battery systems across their entire lifecycle. At its core, BTA focuses on the generation, transfer, and accumulation of heat within battery cells, modules, and packs, and how these thermal dynamics impact performance, longevity, and safety. Unlike generalized thermal analysis, BTA is tailored specifically to the electrochemically driven heat phenomena unique to battery chemistries—from lithium-ion and solid-state to sodium-ion systems—and integrates principles of thermodynamics, fluid mechanics, and electrochemistry to deliver actionable insights.

Heat is an inherent byproduct of battery operation, arising from three primary mechanisms that govern thermal behavior: Joule heating (resistive losses from current flow through electrodes, electrolytes, and separators), reaction heat (exothermic or endothermic energy release from ion intercalation/deintercalation at electrode-electrolyte interfaces), and side reaction heat (uncontrolled exothermic reactions triggered by abuse conditions or material degradation). The interplay of these mechanisms dictates a battery's thermal profile: for example, lithium-ion batteries operating at 2C discharge rates generate 3–4 times more Joule heat than those at 0.5C, while nickel-cobalt-manganese (NCM) chemistries produce 15–20% more reaction heat than lithium-iron-phosphate (LFP) counterparts under identical conditions.

BTA resolves these complex thermal dynamics through a synergistic combination of experimental measurement and numerical simulation. Experimental techniques—including calorimetry, infrared thermography, and thermocouple-based temperature mapping—provide empirical data on heat generation rates, temperature distributions, and thermal propagation characteristics. Numerical simulation, primarily via computational fluid dynamics (CFD) and finite element analysis (FEA), leverages these empirical data to build predictive models that simulate thermal behavior under diverse operating scenarios, from extreme ambient temperatures to high-rate charging. This integration ensures that BTA delivers both accurate real-world validation and scalable design optimization, addressing critical challenges such as thermal runaway prevention, uniform temperature distribution, and thermal management system (BTMS) efficiency.

The scientific rigor of BTA is further underscored by its adherence to fundamental thermal engineering principles. For instance, the heat generation rate (Qgen) of a battery cell can be quantified using the modified Joule-Lenz equation: Qgen = I²Rint + I(Uocv - V), where I is current, Rint is internal resistance, Uocv is open-circuit voltage, and V is operating voltage. This equation, validated through thousands of experimental trials, enables precise calculation of Joule and reaction heat contributions, forming the basis for all BTA modeling and testing. Without BTA, battery systems risk catastrophic failure—thermal runaway, a cascading reaction where unchecked heat leads to separator melting, electrolyte decomposition, and cell rupture, occurs in 89% of battery-related fires, all of which are preventable through rigorous thermal analysis.

Experimental vs. Simulation-Based Battery Thermal Analysis Methodologies

Our Services

Eata Battery's Battery Thermal Analysis Services deliver comprehensive, science-driven thermal characterization, simulation, and optimization solutions tailored to the unique needs of battery manufacturers, EV OEMs, and energy storage developers. Our services span the entire battery lifecycle—from material and cell development to module/pack design and performance validation—integrating cutting-edge experimental techniques and advanced numerical simulation to solve complex thermal challenges.

We focus on delivering actionable insights that directly translate to improved battery performance, extended lifespan, and enhanced safety, without compromising on scientific rigor or practical applicability. Our BTA services are designed to address the full spectrum of thermal challenges, from material-level thermal property measurement to system-level thermal management optimization, and are customizable to accommodate diverse battery chemistries (lithium-ion, solid-state, sodium-ion), form factors (cylindrical, prismatic, pouch), and applications (EVs, consumer electronics, grid-scale storage).

Every service offering is grounded in empirical data and validated by international standards, ensuring that results are accurate, reproducible, and compliant with industry requirements. We leverage a combination of high-precision experimental equipment and state-of-the-art simulation tools to deliver comprehensive thermal analysis, with a focus on scalability—enabling clients to apply insights from cell-level testing to full-scale battery pack design.

Our approach is collaborative, working closely with clients to define testing and simulation parameters that align with their specific goals—whether optimizing a BTMS for fast charging, validating thermal safety for regulatory compliance, or characterizing thermal behavior for material selection. Eata Battery's BTA services eliminate the guesswork from battery thermal design, providing data-driven solutions that reduce development costs, accelerate time-to-market, and ensure long-term battery reliability.

Types of Battery Thermal Analysis Services

Material-Level Thermal Characterization Services

We provide detailed thermal characterization of battery materials—electrodes, electrolytes, separators, casings, and thermal interface materials—to quantify key thermal properties that govern overall battery thermal behavior. These services include thermal conductivity measurement (via laser flash analysis and steady-state heat plate methods) for electrode coatings, separators, and casing materials, with measurement ranges of 0.01–1000 W/m·K and ±1% accuracy. We also conduct specific heat capacity testing (via differential scanning calorimetry) for all battery materials, measuring values between 0.1–5 J/g·K and providing temperature-dependent profiles to account for thermal property changes across operating ranges.

Additionally, we offer thermal stability testing of electrolytes and electrode materials, measuring decomposition temperatures, heat release rates, and reaction enthalpies to assess thermal runaway risk. For thermal interface materials (TIMs), we characterize thermal resistance, compressibility, and long-term thermal stability, helping clients select TIMs that optimize heat conduction between cells and cooling systems. We also provide thermal diffusivity measurement, quantifying how quickly heat spreads through materials—critical for designing batteries with uniform temperature distribution.

Cell-Level Thermal Analysis Services

Our cell-level BTA services focus on quantifying thermal behavior at the individual cell level, providing foundational data for module and pack design. We conduct heat generation rate testing across a range of discharge rates (0.1C–10C) and temperatures (-40°C to 85°C), using isothermal calorimetry to separate Joule heat, reaction heat, and side reaction heat contributions. We also perform temperature mapping (via IR thermography and thermocouple arrays) to identify hotspots, measure temperature gradients, and validate uniform heat distribution across the cell surface.

Thermal runaway characterization is a core cell-level service, using accelerating rate calorimetry (ARC) to measure onset temperature, heat release rate, and gas evolution during thermal runaway. We also conduct cycle life thermal analysis, monitoring how heat generation and thermal conductivity change over 1000+ charge-discharge cycles to quantify thermal degradation and predict lifespan. For cell form factors (cylindrical, prismatic, pouch), we provide customized thermal analysis to address unique challenges—such as heat trapping in pouch cells due to flexible casings or uneven current distribution in cylindrical cells.

Module and Pack-Level Thermal Analysis Services

We deliver comprehensive thermal analysis for battery modules and packs, focusing on thermal propagation, temperature uniformity, and thermal management system (BTMS) efficiency. Our services include temperature mapping of entire modules and packs, using high-resolution IR cameras and distributed thermocouple arrays to measure temperature gradients between cells and across the pack. We quantify thermal propagation rates (how quickly heat spreads between cells during thermal runaway) and evaluate the effectiveness of thermal barriers, such as ceramic fiber mats or phase change materials (PCMs).

We also provide BTMS optimization services, using CFD simulations to model air cooling, liquid cooling, and PCM-based cooling systems, optimizing parameters such as coolant flow rate, channel design, fan speed, and PCM melting point. Our simulations predict maximum cell temperature, temperature uniformity, and BTMS energy consumption, enabling clients to select the most efficient cooling solution for their application. Additionally, we conduct environmental thermal testing of modules and packs, simulating extreme temperatures, thermal shock, and humidity to validate thermal performance under real-world operating conditions.

Thermal Simulation and Modeling Services

Our thermal simulation services leverage advanced CFD, FEA, and electrochemical-thermal coupling models to predict battery thermal behavior across diverse scenarios. We build detailed 3D models of cells, modules, and packs, incorporating empirical thermal property data from our experimental testing to ensure accuracy (simulation error <5% compared to experimental results). We simulate thermal behavior under normal operating conditions (charging, discharging, storage) and extreme scenarios (overcharge, short-circuit, thermal runaway), providing visualizations of temperature distributions, heat flow, and thermal stress.

We also offer design optimization simulations, testing multiple design iterations (cell spacing, cooling system layout, material selection) to identify the configuration that delivers optimal thermal performance, safety, and cost-effectiveness. Our simulation services include thermal lifecycle modeling, predicting how thermal behavior changes over the battery's lifespan due to degradation, and thermal safety modeling, evaluating the risk of thermal runaway and designing mitigation strategies. For clients with existing battery designs, we provide simulation-based thermal audits to identify inefficiencies and recommend improvements.

If you are interested in our services, please contact us for more information.