Contact type lithium battery roll core thickness measuring device
By applying pressure and fixing the core using a contact-type lithium battery core thickness measurement device, the problems of inaccurate measurement and high maintenance costs in existing technologies are solved, achieving accurate thickness measurement and anomaly identification, and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-04-03
AI Technical Summary
Existing lithium battery core thickness measurement devices do not apply pressure to the core during measurement, resulting in gaps between the electrodes. The laser reflection signal is easily affected by the surface condition of the core, and the thickness distribution map shows anomalies such as double peaks and discontinuities. In addition, the maintenance cost is high.
A contact-type lithium battery core thickness measurement device is adopted. The cylinder pushing mechanism between the upper and lower pressure plates applies pressure to the core. Combined with the thickness probe and elastic component, the thickness is measured under compact conditions. The core is fixed with positioning blocks to avoid shaking, thus achieving accurate thickness measurement and anomaly identification.
It enables accurate measurement of core thickness, with a good histogram-like thickness distribution and no breaks, reducing maintenance costs and enabling early identification of thickness defects and abnormal electrode surface density.
Smart Images
Figure CN224080960U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery core technology, specifically a contact-type lithium battery core thickness measuring device. Background Technology
[0002] In the lithium-ion battery production process, core thickness measurement is an indispensable and important step. It can serve as an early warning for issues such as scratches during casing and excessively thick cells, preventing large-scale anomalies. Furthermore, the core thickness value measured in this process can be used to monitor the thickness of the positive and negative electrode sheets, allowing for timely handling of anomalies in previous processes.
[0003] Existing technologies generally employ laser thickness measurement devices, which calculate the thickness value based on the laser's round-trip time. However, these technologies have the following drawbacks:
[0004] No pressure was applied to the core during measurement, and there were gaps between the electrodes, resulting in the measured value reflecting the apparent thickness in a fluffy state.
[0005] Laser reflection signals are easily affected by the surface condition of the core, and measurement errors can occur when there are wrinkles or foreign objects.
[0006] Thickness distribution maps often exhibit abnormal patterns such as bimodal and fault-like structures, making it impossible to accurately reflect the thickness fluctuations of the electrode sheet.
[0007] The measurement system requires complex optical path calibration and has high maintenance costs.
[0008] Therefore, a novel contact-type lithium battery core thickness measurement device is needed. Summary of the Invention
[0009] The purpose of this utility model is to provide a contact-type lithium battery core thickness measuring device to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: a contact-type lithium battery core thickness measuring device, comprising an upper pressure plate and a lower pressure plate, wherein the upper pressure plate is fixed to the lower part of a top plate, a thickness measuring probe is provided on the front side of the top plate, the thickness measuring probe is provided with an elastic component, which can realize a small stroke elastic displacement of the probe tip, and the contact point of the thickness measuring probe is on the surface of the lower pressure plate;
[0010] The top plate is connected to a cylinder pushing mechanism. The cylinder pushing mechanism drives the top plate and the upper pressure plate to descend synchronously, reducing the distance between the upper pressure plate and the lower pressure plate, thereby applying pressure to the core placed on the lower pressure plate.
[0011] Preferably, the cylinder pushing mechanism is started and stopped by a unified control system.
[0012] Preferably, the lower pressure plate is provided with multiple positioning blocks, which are used to fix the core to be tested and prevent the core from shaking inside the fixture. The positioning blocks are replaceable.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model uses a contact-type compression measurement method to measure the thickness of the electrode sheets in the core while they are in a compact state, resulting in more accurate core thickness measurements. The thickness distribution exhibits a good histogram distribution without any breaks, and the core thickness shows a good normal distribution without any abnormalities such as breaks at the upper or lower limits. Furthermore, it can identify problems such as poor core thickness and abnormal electrode surface density in advance. The mechanical device does not require complex calibration and maintenance, resulting in low operating costs. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a side view of the present invention;
[0016] Figure 3 This is a schematic diagram of the probe structure in this utility model;
[0017] In the diagram, there are: upper pressure plate-1, top plate-2, lower pressure plate-3, thickness probe-4, cylinder pushing mechanism-5, and positioning block-6. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] Please see Figure 1 This utility model provides a technical solution: a contact-type lithium battery core thickness measuring device, including an upper pressure plate 1 and a lower pressure plate 3. The upper pressure plate 1 is fixed to the lower part of the top plate 2. A thickness measuring probe 4 is provided on the front of the top plate 2. The thickness measuring probe 4 is provided with an elastic component, which can realize a small stroke elastic displacement of the probe tip. The contact point of the thickness measuring probe is on the surface of the lower pressure plate 3.
[0020] The top plate 2 is connected to a cylinder pushing mechanism 5. The cylinder pushing mechanism 5 drives the top plate 2 and the upper pressure plate 1 to descend synchronously, reducing the distance between the upper pressure plate 1 and the lower pressure plate 3. This applies pressure to the core placed on the lower pressure plate 3, ensuring that the core thickness exhibits a good normal distribution when the thickness is measured, and that no abnormalities such as discontinuity occur at the upper or lower limits. It can also identify problems such as poor core thickness and abnormal electrode surface density in advance.
[0021] The cylinder driving mechanism 5 is controlled by the control system to start and stop.
[0022] The lower pressure plate 3 is provided with multiple positioning blocks 6. The positioning blocks 6 are used to fix the core to be tested, preventing the core from shaking inside the tooling and causing inaccurate measurement. The positioning blocks 6 can be replaced according to the different core sizes.
[0023] Working principle: First, ensure the overall level and stability of the device. Then, place the core on the lower pressure plate and make the core close to the positioning block. The control system controls the cylinder to start the mechanism, which pushes the top plate to drive the upper pressure plate to press down, applying a vertical clamping force to the core to be tested. This ensures that the internal electrode sheets of the core are fully compacted and fixed. During the clamping process, the tip of the thickness probe adaptively contacts the surface of the lower pressure plate through an elastic component. The distance between the upper and lower pressure plates after the core is clamped is measured by a displacement sensor, thus obtaining the core thickness.
[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A contact type lithium battery roll core thickness measuring device, characterized by: The application relates to a thickness measuring device for a roll core, which comprises an upper pressing plate (1) and a lower pressing plate (3), the upper pressing plate (1) is fixed to the lower part of a top plate (2), the front surface of the top plate (2) is provided with a thickness measuring probe (4), the thickness measuring probe (4) is provided with an elastic component, small stroke elastic displacement of a needle end can be realized, and the contact point of the thickness measuring probe is on the surface of the lower pressing plate (3); The top plate (2) is connected with a cylinder pushing mechanism (5) at the top, the cylinder pushing mechanism (5) drives the top plate (2) and the upper pressing plate (1) to synchronously descend, the distance between the upper pressing plate (1) and the lower pressing plate (3) is reduced, and the roll core placed on the lower pressing plate (3) is pressed.
2. The contact type lithium battery jelly-roll thickness measuring device according to claim 1, characterized in that: The cylinder pushing mechanism (5) is started and stopped by a control system.
3. The contact type lithium battery jelly-roll thickness measuring device according to claim 2, characterized in that: A plurality of positioning blocks (6) are arranged on the lower pressing plate (3), the roll core to be measured is fixed through the positioning blocks (6), the roll core is prevented from shaking in the tool, and the positioning blocks (6) are replaceable.