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 calorimeterAs a precision device specifically designed to measure the heat generation characteristics of batteries under isothermal conditions, its application areas closely revolve around the research and development, production, safety assessment, and application scenario verification of batteries, as follows:
1、 Research and development of power batteries and consumer electronics batteries
Material and formula optimization:
Evaluate the heat generation characteristics of different positive electrode materials (such as ternary materials, lithium iron phosphate), negative electrode materials (such as graphite, silicon-based materials), and electrolyte formulations, and screen material combinations with low heat generation and high thermal stability. For example, by comparing the effects of different electrolyte additives (such as flame retardants) on the thermal power during battery charging and discharging processes, the electrolyte formula can be optimized to reduce the risk of thermal runaway.
Battery design improvement:
Analyze the impact of battery structure (such as the number of tabs, diaphragm thickness, and cell stacking method) on heat generation distribution, and guide the structural design of high-power density batteries (such as reducing local heat concentration).
2、 Battery safety assessment and abuse testing
Research on the mechanism of thermal runaway:
Simulate the heat generation process of batteries under abusive conditions such as overcharging, overdischarging, short circuit, needle puncture, and compression, quantify the "heat generation threshold" (such as the point of sudden increase in thermal power) before thermal runaway, and provide data support for battery safety warning models.
Development and verification of safety standards:
In accordance with international/domestic battery safety standards (such as UN38.3, IEC 62133), test the thermal safety of batteries in polar environments, and verify whether the batteries meet safety requirements during transportation, storage, and use.
3、 Design of Battery Thermal Management System
Optimization of thermal management strategy:
Measure the heat generation rate of batteries at different charge and discharge rates and ambient temperatures, and provide parameters (such as heat dissipation requirements and temperature control thresholds) for power design of thermal management systems (such as liquid cooling and air cooling). For example, the thermal management plan for the power battery pack of new energy vehicles needs to optimize the heat dissipation efficiency based on actual heat generation data.
Low temperature performance evaluation:
Test the heat generation and dissipation balance of the battery in low-temperature environments (such as -20 ℃, -40 ℃), evaluate the stability of the battery in cold regions, and provide a basis for low-temperature preheating strategies.
4、 Application of energy storage batteries and special batteries
Energy storage system safety verification:
For large-scale energy storage batteries (such as lithium iron phosphate battery packs used for grid energy storage), test their cumulative heat generation characteristics during long-term cycling, evaluate the risk of thermal runaway spread in the energy storage system, and guide the layout design of energy storage power stations (such as battery module spacing and fire isolation).
Special scenario adaptability testing:
Provide heat generation data under extreme working conditions for special batteries in aerospace, military and other fields, such as high-temperature batteries and high rate discharge batteries, to verify their thermal stability in closed, high-temperature or low-pressure environments.
5、 Research on Battery Life and Reliability
Correlation analysis between cyclic aging and heat generation:
Track the heat generation changes of batteries during long-term cycling (such as whether the heat generation rate increases abnormally in the later stage of aging), establish a correlation model between heat generation characteristics and battery life decay, and predict the remaining life and reliability of batteries.
Storage performance evaluation:
Measure the self discharge heat generation rate of batteries during long-term storage (at different temperatures and SOC states), evaluate energy loss and safety risks during storage, and optimize the storage conditions of batteries (such as optimal storage SOC and temperature).