Why do lithium battery cell assembly lines start using laser displacement sensors to monitor height and segment differences?

summary:This case focuses on the assembly line of lithium battery cells and explains it to everyoneLaser displacement sensorWhy is it more suitable for detecting the height of the top cover and the difference in the shell opening, and how does the installation angle, teaching mode, and output method affect on-site stability.

1、 The problem lies not only in the speed, but also in the contact detection itself

The customer's original workstation needs to determine two things: whether the height of the top cover after pressing is within the window, and whether there is a significant gap around the shell opening. This action may not seem complicated, but it's not the same thing when placed on a lithium battery assembly line. When the beat is fast, the contact probe will face numerical fluctuations caused by wear, rebound, and slight shaking of the workpiece; Once there is a slight change in the fixture status, the threshold will be frequently adjusted on site.

Even more troublesome is that the surface of the battery cell is not always in an ideal state. The metal surface has reflections, and in some areas, due to process residues, color differences, or slight deviations in pressing, ordinary switch type detection methods can only provide a vague judgment. When engineers want to trace the source, they do not have enough data in hand.

2、 Why is it more suitable to use laser displacement sensors here

The customer ultimately chose AtormLD1 series laser displacement sensorThe judgment logic is not complicated, what this workstation really needs is continuous distance measurement, not simply the presence or absence of signals.

• Firstly, non-contact measurement is more suitable for high-speed lines.When the production line has a fast pace, the mechanical action of the contact probe itself is a variable, and the laser displacement directly reads the distance change, reducing one layer of mechanical contact error.
• Secondly, it is possible to simultaneously observe the height and segment difference.As long as the reference plane and judgment window are set, the same workstation can not only judge the overall height, but also identify local lifting or unevenness after pressing.
• Thirdly, the output method is easier to integrate into the system.This type of displacement sensor can be used for both switch quantity determination and analog quantity, making it more convenient for equipment manufacturers to connect to PLCs, industrial computers, or data acquisition modules in the future.

This time, the customer adopted a center distance specification of 50mm, which is more suitable for compact workstations. The response time is configured according to the standard mode, ensuring stability before pursuing the upper limit of speed. This judgment is correct. In on-site projects, it is more important to first stabilize the signal than to blindly follow 1.5ms.

3、 The real difficulty is not installation, but dismantling the source of error

Many people think thatLaser displacement sensorIt can be tested just by installing it, but what really determines the effect is whether you have figured out the source of the error clearly. In this project, the customer initially positioned the sensor directly towards the highly reflective edge, but the values occasionally fluctuated. Later, the light emission angle was adjusted and the measurement point was placed in a more stable reference area. Combined with the teaching mode setting of upper and lower limit windows, the fluctuation immediately converged.

This is also one of the reasons why products like Atorm LD1 are suitable for lithium-ion workstations. It doesn't just give you a switch result, but can hand over continuous distance changes to you, letting engineers know whether the problem lies in the product, fixture, or installation posture. For equipment manufacturers, this is more important than passing a single inspection, as it relates to the maintainability of the entire line in the future.

4、 After the renovation, the customer did not receive a more expensive sensor

After a month of trial operation, the customer's feedback was very direct: there were fewer alarms, the machine adjustment time was shorter, and the engineer was more likely to locate the source of the abnormality. Previously, when encountering unstable pressing, we could only suspect the mechanism first; Now by directly looking at the displacement curve and the judgment window, we can know whether it is a single cell exceeding the tolerance or if the fixture status is biased.

5、 What conclusion can this case bring to the equipment factory

The conclusion is clear:If your workstation needs to measure continuous dimensions such as height, pitch, and flatness, and the production line has a fast pace and the surface condition of the parts is complex, thenLaser displacement sensorUsually more worthy of priority evaluation than contact measurement. On the other hand, if only rough confirmation is needed on site without size window requirements, there is no need to make the plan too heavy.

The reason why the lithium battery industry is a large-scale industry for laser displacement sensors is here. It is not simply pursuing high precision, but requires a more stable and easily accessible data-driven detection method under high beat rate, small size, and complex surface conditions.

If you are also evaluating lithium battery assembly, polarizer, shell, or post weld inspection stations, first look at three things: the surface condition of the measured object, installation distance, and whether you need switch quantity or continuous displacement data. Think about these three items first, the selection will be much faster.