Battery isothermal calorimeterIt is a high-precision thermal analysis instrument developed based on the principle of power compensation isothermal calorimetry, dedicated to measuring the heat changes of batteries during charging and discharging processes, providing key data support for battery thermal management, safety assessment, and performance optimization. This instrument controls the electric heating element through feedback to maintain a constant temperature of the battery throughout the testing process. When the battery undergoes heat absorption or release reactions, the instrument will monitor and compensate for the heat changes in real time, accurately quantifying the thermal effects of the battery system. The isothermal temperature measurement block consists of a bottom layer and a measurement layer. The bottom layer maintains a constant temperature through Peltier elements, while the measurement layer records changes in the power of the electric heater to calculate the heat generated or absorbed by the battery.
Battery isothermal calorimeterThe main characteristics are:
1、 High precision isothermal control, precise capture of heat flow signals
Strict isothermal environment: high-precision constant temperature control technology (such as constant temperature bath, high-precision temperature control chamber) is adopted to ensure stable ambient temperature during the testing process (temperature control accuracy can reach ± 0.001 ℃), eliminating the interference of ambient temperature fluctuations on battery heat generation measurement.
High sensitivity heat flow detection: Equipped with high-resolution heat flow sensors (such as thermopile sensors), it can capture small changes in thermal power (with a low detection limit of up to μ W level), accurately quantifying the heat generation rate and total heat generation of the battery under different operating conditions (such as normal charging and discharging, overcharging, short circuit).
2、 Compatible with a wide range of battery types, catering to different testing needs
Compatible with multiple battery specifications: can test button batteries, cylindrical batteries (such as 18650, 21700), square soft pack/hard shell batteries (such as power battery cells), and some models support small batch testing of battery modules.
Support diversified testing modes: covering conventional charge discharge thermal behavior testing, thermal stability monitoring during cycle life, heat generation and thermal runaway warning under abuse conditions (such as overcharging, needle puncture, extrusion), and thermal characteristic analysis in low/high temperature environments.
3、 Rapid dynamic response, capturing instantaneous thermal events
Fast response time: The instrument has low thermal inertia and can quickly respond to the instantaneous heat generation fluctuations of the battery during charge and discharge switching, rate changes, or sudden faults (such as internal short circuits), accurately recording the peak heat flux and change trend.
High data collection frequency: The sampling frequency can reach dozens of times per second or even higher, and can capture millisecond level instantaneous thermal events (such as short-term intense heat generation during lithium ion battery lithium deposition and membrane breakdown), providing key data for studying the mechanism of battery thermal runaway.
4、 Security protection design ensures the safety of the testing process
Explosion proof and leak proof structure: The testing chamber is made of corrosion-resistant and high-temperature resistant materials (such as stainless steel), and some models are equipped with explosion-proof pressure relief devices and inert gas protection systems (such as nitrogen atmosphere), which can cope with potential electrolyte leakage, gas release, and even small-scale explosion risks during battery testing.
Real time monitoring and emergency stop control: integrating auxiliary sensors such as temperature, pressure, and gas concentration. When abnormalities are detected (such as sudden temperature rise or pressure exceeding the limit), an alarm can be automatically triggered and the battery power supply can be cut off to avoid further danger.
5、 Intelligent data processing and analysis functions
Real time data visualization: By using supporting software to display real-time parameters such as thermal power curve, cumulative heat generation, battery voltage/current, etc., the correlation between battery thermal behavior and electrochemical performance (such as the relationship between heat generation rate and charge discharge rate) is intuitively presented.
Professional analysis module: It can automatically calculate the heat generation efficiency, entropy change heat, polarization heat and other sub components of the battery, support data export and secondary analysis (such as combining battery impedance spectroscopy to analyze the source of heat generation), and provide a basis for battery thermal management design and material optimization.
6、 Compact design and ease of use, suitable for laboratory scenarios
Miniaturization and low energy consumption: Compared to large calorimeter systems, battery isothermal calorimeter has a more compact volume, suitable for desktop placement in laboratories, and has lower operating energy consumption (especially in the constant temperature control stage).
Easy to operate: Parameter settings (such as temperature, charging and discharging system), testing start and stop can be achieved through touch screen or computer software. Some models support preset testing programs (such as cyclic charging and discharging thermal behavior linkage testing), reducing operational complexity.