Square lithium battery "pole" detection solution

The top cover of a square battery is mainly composed of a top cover plate, positive and negative poles, explosion-proof device, liquid injection hole, etc. Generally, the pole part includes a flip-up device (OSD), a current cut-off structure (CID) and a short-circuit device (Fuse). mechanism.

Today we will share with you a 3D inspection case of lithium battery poles.

Part.1

Testing requirements

1) Check the flatness and parallelism of the positive and negative poles;

2) Detect the flatness of P5-P14 points (see the picture in the detection principle for details);

3) Detect the height difference between the positive and negative poles from the bottom.

Part.2

Installation diagram

3D laser profiler model: LP-
3060M

Part.3

Detection renderings

Product overall thermal point cloud map and local thermal point cloud map

Product overall mark point cloud map and local mark point cloud map

Part.4

Detection principle

3DCloud detection interface

1. Use the LP-3060M laser profiler to scan the image once, establish a zero-point coordinate system based on the central feature of the drawing, and output the coordinates for each measurement point; 2. Use the "area measurement" tool in the 3DCloud software to self-fit the plane and output The flatness of the positive and negative poles is A1 and A2 respectively; 6 points on the surface of the positive pole are used to fit the datum plane, and 6 points on the surface of the negative pole are used as measuring points to fit the plane, and the parallelism of the surfaces of the two poles is measured; 3. As above Figure, select the top point P5-P14 of the cover plate to fit the plane, P1-P14 to fit the filtering datum plane to filter out the noise points, and use the least square method to obtain the flatness of P5-P14 as A3; 4. The plane of the positive pole block is the datum plane (Surface 1), measure the height difference H1 of face 2. In the same way, measure the height difference H2 from face 4 to the negative pole (face 3).

Part.5

Test results

The measurement speed is 40mm/s, and the CT measurement time is 7.5S; the flatness, parallelism and height of the product can be accurately measured, and the dynamic repeatability for 20 times is around 0.02mm.

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The 3DCloud software used in the above cases has rich detection functions, is equipped with various image preprocessing functions, and has built-in 21 types of commonly used 3D detection tools, making it easy and convenient to complete settings.

It also performs well in the following applications:

PCB board height difference detection

Connector pin flatness inspection

Battery core cover welding quality inspection

Glue path detection (glue breakage, glue overflow, glue height)

Appearance inspection of battery pack glue and blue film