IEST Battery Pressure Distribution Sensor Measure System (BPD1000)

IEST Battery Pressure Distribution Sensor Measure System

1. Background

As a common electric energy storage device, lithium-ion battery (LIB) has the advantages of high energy density high specific power, high output voltage, small self-discharge, long service life, etc.which is widely used in electric vehicles, electronic products and other fields. On the one hand, during the manufacturing process of the LIB, the internal stress distrbution or the surtace thickness distribution wll be uneven because the process environment cannot be completely consistent; on the other hand, in the electrochemical cycle process, intercalation and deintercalation of li-ions will lead to the volume expansion and contraction, However, the uneven current density or temperature distribution inside the LIB, wi. lead to the uneven distribution of the stress durina the expansion of the LIB. Thus, the quantitative characterization of the stress distribution on the surface of LIB can provide a deeper perspective for the battery stress analysis, assist technicians to analyze the battery stress distribution, explore the causes of the failure of the LIB, and develop a safer and more reliable LIB.

2. Introduction of Pressure Distribution Measure System

Structural composition:

3. Software interface:

4. Characteristic:

1. Display the resultant force curve of eachdetection unit in real time;

2. Select the pressure distribution diagramaccording to the user’s actual used area,

3. Synchronize the charging and discharging datain real time;

4. One-click to export the data report;

5. Real-time calibration of pressure (combinedwith in-situ expansion equipment).

5. Applications

1. With the expansion force test fixture or in-situ expansion test equipment, the stress distribution at different positions on the surface of the cell during the cycling process is characterized.

2. Quickly and quantitatively evaluate the surface flatnessof the cell.

5.1 Application 1: Test of stress distribution on the surface of the cell during the cycle

• Test information: NCM-Graphite system,3~4.3V, 0.5C, 50kg preload;
• Result analysis: It can quantitatively characterize the difference of stress distribution on the surface of the cell, provide a deeper perspective for the stress analysis of the cell, and help technicians analyze the stress distribution in the cell, explore the causes of failure of the cell and develop a safer and more reliable cell.

5.2 Application 2: Surface flatness test of fresh cell

• Result analysis: there is a certain correlation between the cell process design and the cell pressure distribution(flatness). Technicians can develop appropriate distribution standards through the pressure distribution system to monitor the batch stability of the delivered cells.

6. Parameters