Device for monitoring crevasse of foil leaving area of pole piece and rolling system

Abstract

The utility model relates to the technical field of battery pole piece detection, in particular to a device for monitoring a crevasse of a foil leaving area of a pole piece and a rolling system. A device for monitoring a crevasse of a foil leaving area of a pole piece comprises a mounting frame, a first electrode plate, a second electrode plate, a first electrode plate, a second electrode plate, a first electrode plate, a second electrode plate and a third electrode plate, and the mounting frame is provided with at least two first mounting bases; the first mounting base is provided with a rotating part, the rotating part is used for mounting a monitoring sensor, the angle of the rotating part relative to the first mounting base is adjustable, and the monitoring sensor is used for detecting whether the pole piece has a crevasse or not. The utility model relates to a device for monitoring a crevasse of a foil remaining area of a pole piece, which solves the problems that the crevasse of the pole piece cannot be detected due to the limitation of a CCD (Charge Coupled Device) device when the crevasse of the pole piece is detected by the CCD device, and the crevasse of the pole piece is difficult to observe due to the extremely high running speed of a roller press and manual naked eye detection in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pole piece detection, in particular to a device for monitoring the rupture of a pole piece foil area and a rolling system. Background Art

[0002] Rolling of battery pole pieces is a key manufacturing step aimed at improving the energy density and electrochemical performance of the battery. In the manufacturing process of lithium-ion batteries, both the positive and negative pole pieces are made by coating a slurry formed by mixing active materials (such as lithium compounds or graphite), conductive agents and binders on copper or aluminum foil current collectors. The rolling process is to make the active materials in the slurry adhere more tightly to the current collector. The coated pole pieces are compressed with a certain pressure by one or more pairs of precisely arranged rollers. This not only significantly reduces the internal porosity of the pole piece and increases the active material loading per unit area, but also enhances the conductive network structure inside the pole piece, ensuring that the current can be efficiently transmitted between the active materials during the charge and discharge process of the battery, thereby improving the overall performance of the battery.

[0003] The electrode includes a coating area and a foil area, and two foil areas are set on both sides of a coating area. A multi-piece electrode is a electrode that contains multiple coating areas. The multiple coating areas are arranged side by side, which increases the width of the electrode, and a foil area is also set between two adjacent coating areas belonging to the same electrode. The thickness of the foil area of the electrode is very thin. During the production process of the electrode, the foil area of the electrode may be broken due to improper slurry ratio, poor storage conditions and other problems. The appearance of a crack in the foil area will affect the performance and safety of the battery. During the rolling process, if the foil area is broken, the electrode may break. Therefore, during the rolling process, it is necessary to detect whether there is a crack in the foil area.

[0004] There are two existing methods for detecting electrode breaks during rolling: the first is to use a CCD (Charge-Coupled Device) device for detection. However, due to the limitations of the CCD device itself, it cannot detect electrode pieces whose width exceeds its detection range, and cannot be used for multiple electrode pieces whose width exceeds its detection range. In addition, if the lens of the CCD device is replaced with a wide-angle high-definition lens, the cost is huge. The second is to use the human eye for detection, but because the roller press runs at an extremely high speed, it is difficult to observe electrode breaks with the naked eye. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the existing technology uses a CCD device to detect the break of the electrode piece. Due to the limitation of the CCD device itself, it is unable to detect the electrode piece with a width exceeding its detection range, and because the roller press runs at an extremely high speed, it is difficult to observe the break of the electrode piece with the naked eye. A device for monitoring the break of the electrode piece foil area and a roller pressing system are provided.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A device for monitoring a rupture in a pole piece foil region, comprising:

[0008] A mounting frame, wherein the mounting frame is provided with at least two first mounting bases, and the distance between two adjacent first mounting bases is adjustable;

[0009] The first mounting base is provided with a rotating member, the rotating member is used to install a monitoring sensor, the angle of the rotating member relative to the first mounting base is adjustable, and the monitoring sensor is used to detect whether the pole piece has a crack.

[0010] One first mounting base corresponds to one monitoring sensor. The number of monitoring sensors matches the number of foil-retaining areas, including the situation where several monitoring sensors detect one foil-retaining area, and also including the situation where one monitoring sensor detects several foil-retaining areas. When multiple pole pieces need to be detected, the number of monitoring sensors is increased accordingly. Rotating the rotating member can drive the monitoring sensor to rotate, thereby changing the orientation of the monitoring sensor so that the monitoring sensor can face the foil-retaining area. When the distance between the pole piece and the monitoring sensor is large, the spacing between the two adjacent first mounting bases is adjusted so that the monitoring sensor is as close to the pole piece as possible to avoid affecting the detection accuracy due to the large distance between the pole piece and the monitoring sensor, and the rotating member is rotated so that the monitoring sensor is aligned with the foil-retaining area to improve the detection accuracy. Compared with the existing CCD detector that can only detect pole pieces with a width less than or equal to its detection range and cannot be applied to pole pieces of different widths, this device can increase the number of monitoring sensors by increasing the number of first mounting bases, and can rotate the rotating member to change the orientation of the monitoring sensor so that the monitoring sensor can be aligned with the foil-retaining area to improve the detection accuracy.

[0011] As a preferred solution of the present invention, the mounting frame includes a rod, and the first mounting base is externally mounted on the rod.

[0012] As a preferred solution of the present invention, the mounting frame includes a slide rail, and the first mounting base can move along the slide rail.

[0013] As a preferred solution of the present invention, the monitoring sensor includes a fiber optic transmitter and a fiber optic receiver, and the optical signal emitted by the fiber optic transmitter can be received by the fiber optic receiver; or, the monitoring sensor includes an ultrasonic transmitter and an ultrasonic receiver.

[0014] As a preferred embodiment of the present invention, the optical fiber transmitter and the optical fiber receiver are respectively arranged on the upper side and the lower side of the transmission area of the roller press; or, the ultrasonic transmitter and the ultrasonic receiver are respectively arranged on the upper side and the lower side of the transmission area of the roller press.

[0015] The conveying area of the roller press is the area between the roller press's down-pressing system and the entrance uncoiler, and between the down-pressing system and the exit uncoiler.

[0016] As a preferred solution of the present invention, the monitoring sensor includes an infrared thermal imager.

[0017] As a preferred solution of the present invention, the infrared thermal imager is arranged on the upper side of the conveying area of the roller press.

[0018] As a preferred solution of the present invention, the rotating member is a ball joint or a universal ball joint.

[0019] A rolling system comprises a rolling machine and a device as described above for monitoring the rupture of the electrode foil area.

[0020] The use of a roller press and the above-mentioned device for monitoring the rupture of the electrode foil area can be applicable to electrode pieces of different widths and can ensure the detection accuracy of the electrode rupture as much as possible.

[0021] As a preferred solution of the present invention, it also includes a control module, which is connected to the monitoring sensor and the roller press. The monitoring sensor can send a signal to the control module, and the control module can receive the signal sent by the monitoring sensor and start or stop the roller press.

[0022] When the monitoring sensor detects a crack in the electrode, it sends a signal to the control module. The control module receives the signal and shuts down the roller press to avoid as much as possible the situation where the belt breaks due to the crack in the electrode, affecting the consistency of the electrode and thus affecting the battery performance and safety.

[0023] As a preferred solution of the present invention, it also includes an alarm module, which is connected to the control module. The control module can send a signal to the alarm module, and the alarm module can receive the signal sent by the control module and the first limit member can send an alarm.

[0024] When the detection device detects that the electrode has a crack, it sends a signal to the alarm module. The alarm module receives the signal and sounds an alarm, which makes it easier for the staff to find the crack in the electrode and take corresponding remedial measures.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] 1. A device for monitoring ruptures in the foil-retaining area of an electrode, comprising at least two first mounting bases, wherein the first mounting bases are used to mount monitoring sensors, and the orientation of the monitoring sensors can be adjusted by a rotating member so that they are aligned with the foil-retaining area; the number of monitoring sensors is equal to the number of foil-retaining areas.

[0027] The adjustable spacing between two adjacent first mounting bases minimizes the distance between the monitoring sensor and the electrode, improving monitoring accuracy. When multiple electrode pieces need to be inspected, the number of monitoring sensors is increased accordingly. This solves the existing problem of using a CCD device to detect electrode piece cracks. Due to the limitations of the CCD device itself, it cannot detect electrode pieces with a width exceeding its detection range. Furthermore, due to the extremely high operating speed of the roller press, electrode piece cracks are difficult to detect with the naked eye.

[0028] 2. A rolling system comprising a rolling machine and a device for monitoring the rupture of the electrode foil area as described above, which can be applied to electrodes of different widths and can ensure the detection accuracy of the electrode rupture as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is an isometric view of a device for monitoring a rupture in a pole piece foil region in Example 1;

[0030] Figure 2 is an axonometric view of a roller pressing system in Example 2;

[0031] Figure 3 is a front view of a roller pressing system in Example 2;

[0032] Figure 4 is a top view of a roller pressing system in Example 2;

[0033] Icon: 101-first mounting base, 102-second mounting base, 2-first limiting member, 3-second limiting member, 4-connecting member, 7-roller press, 8-pole piece. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings.

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the following descriptions of specific embodiments, terms indicating orientations or positional relationships, such as "upper," "lower," "left," "right," "center," "inner," and "outer," are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the device / apparatus is typically placed during use. These terms are intended solely to facilitate description or simplify the description of the specific embodiments, and to help technicians quickly understand the solutions. They do not indicate or imply that a particular device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and therefore should not be construed as limiting the present invention.

[0037] The terms "horizontal" and "vertical" and the like do not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or suspended, but rather they can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but rather it can be slightly tilted. Alternatively, it can be simply understood that the corresponding devices / components / elements are set in specific directions such as "horizontal" and "vertical", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation of within ±8%, more preferably an error / deviation of within ±6%, more preferably an error / deviation of within ±5%, and more preferably an error / deviation of within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present utility model.

[0038] The terms “first”, “second”, “third”, etc. are merely used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0039] The terms "set", "install", "connected" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be welding, riveting, bolting, threaded connection and other commonly used connection means in this field. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two components.

[0040] Example 1

[0041] like Figures 1-4As shown, a device for monitoring the cracks in the foil area of the electrode piece includes: a mounting frame, the mounting frame is provided with at least two first mounting bases 101, and the distance between two adjacent first mounting bases 101 is adjustable; the first mounting base 101 is provided with a rotating part, the rotating part is used to install a monitoring sensor, the angle of the rotating part relative to the first mounting base 101 is adjustable, and the monitoring sensor is used to detect whether the electrode piece 8 has a crack.

[0042] like Figure 1 As shown, the mounting frame includes a rod-shaped first limiting member 2 and a second limiting member 3, and a first mounting base 101 is arranged on the outer sleeve of the first limiting member 2, and the first mounting base 101 can slide along the axial direction of the first limiting member 2. The first limiting member 2 and the second limiting member 3 are positioned correspondingly and are connected by a connecting member 4. In this embodiment, because a double-width (two coating areas and three foil-retaining areas are spaced apart) electrode piece needs to be detected, a total of three first mounting bases 101 are provided, which are used to detect the three foil-retaining areas respectively. The monitoring sensor corresponding to each first mounting base 101 is aligned with a different foil-retaining area. In actual use, if there are three-width electrode pieces, four first mounting bases 101 should be provided to install four monitoring sensors; if there are four-width electrode pieces, five first mounting bases 101 should be provided to install five monitoring sensors, and so on. During use, the electrode piece 8 passes through the area between the first limiting member 2 and the second limiting member 3, thereby being detected by the monitoring sensor.

[0043] In this embodiment, the monitoring sensor is a laser interrogator (not shown). The laser interrogator includes a laser emitter and a laser receiver, which are respectively mounted on first mounting bases 101 corresponding to the first and second stoppers 2 and 3. The laser emitter is mounted on the first mounting base 101 on the first stopper 2, and the laser receiver is mounted on the first mounting base 101 on the second stopper 3. The positions of the laser emitter and laser receiver are interchangeable. The spacing between two adjacent laser emitters can be adjusted, as can the spacing between two adjacent laser receivers, as long as they can receive the signals emitted by the corresponding laser emitters. In this embodiment, the second stopper 3 is provided with three first mounting bases 101 to accommodate three laser receivers. However, the number of laser receivers can be increased according to actual needs, and the number of laser emitters and laser receivers does not need to be equal. It is also feasible for one laser receiver to simultaneously receive optical signals from three laser emitters. In actual use, the second stopper 3 can also be omitted, and the laser receiver can be fixed by other means, as long as it can receive the signals emitted by the corresponding laser emitters.

[0044] In this embodiment, the first limiting member 2 and the second limiting member 3 can be replaced by a member provided with a track (not shown in the figure). The first mounting base 101 can move along the track. The first limiting member 2 and the second limiting member 3 can be of different forms or of the same form. However, to facilitate the installation of the present device, it is preferred that the second limiting member 3 and the first limiting member 2 are of the same form, so that the first mounting base 101 and the second mounting base 102 are of the same form as much as possible.

[0045] In this embodiment, the laser beammeter can be replaced by a monitoring sensor including an ultrasonic transmitter and an ultrasonic receiver. When the ultrasonic transmitter and the ultrasonic receiver are replaced, the other components remain unchanged.

[0046] Alternatively, the laser beammeter in this embodiment can be replaced by an infrared thermal imager. When the infrared thermal imager is replaced, the mounting bracket only includes the first limiting member 2.

[0047] Example 2

[0048] like Figure 2-Figure 4 As shown, a rolling system includes a rolling press 7 and a device for monitoring cracks in the electrode foil retaining area according to Example 1. The conveying area of the rolling press 7 is disposed within the frame of the mounting frame. The conveying area is the area between the pressing system of the rolling press 7 and the entrance uncoiler, and between the pressing system and the exit uncoiler.

[0049] When the monitoring sensor is a combination of a laser transmitter and a laser receiver or a combination of an ultrasonic transmitter and an ultrasonic receiver, the corresponding transmitter and receiver are respectively arranged on the upper and lower sides of the conveying area of the roller press 7; when the monitoring sensor is an infrared thermal imager, the infrared thermal imager is arranged on the upper side of the conveying area of the roller press 7.

[0050] This system includes a control module, which is connected to the detection device and the roller press 7. The detection device can send a signal to the control module, and the control module can receive the signal sent by the detection device and shut down the roller press 7. In this embodiment, the control module includes an optical fiber amplifier (not shown in the figure) and a PLC (Programmable Logic Controller) (not shown in the figure). The optical fiber amplifier can send a signal to the PLC, and the PLC can control the start and stop of the roller press 7. The optical fiber receiver 6 will send a signal to the optical fiber amplifier. The size of the signal sent by the optical fiber receiver 6 is positively correlated with the size of the light it receives. When there is a crack in the pole piece, the signal sent by the optical fiber receiver 6 will increase rapidly and return to its original size, with a peak. When the peak of the signal sent by the optical fiber amplifier to the PLC exceeds the pre-trial threshold, the PLC stops the rolling of the roller press 7. Using the PLC to control the roller press 7 to stop working is faster than observing with the naked eye and manually pausing the work of the roller press 7. Furthermore, the first limiting member 2 is arranged in the conveying area. Thus, when the PLC stops the roller press 7 from working, the broken area is still in the conveying area, which is convenient for the operator to perform remedial work.

[0051] The device also includes an alarm module. The optical fiber receiver 6 is connected to the alarm module through a PLC. The detection device can send a signal to the alarm module. The alarm module can receive the signal sent by the detection device and send an audible and visual alarm.

[0052] When the monitoring sensor is a combination of an ultrasonic transmitter and an ultrasonic receiver, different devices are connected between the ultrasonic receiver and the PLC as needed: If the ultrasonic sensor outputs an analog signal (such as the common 4-20mA current signal), an analog input module (AI Module) is set between the ultrasonic receiver and the PLC to convert the sensor's analog signal into a digital signal for internal processing and logic control of the PLC; if the ultrasonic sensor outputs a digital signal (such as a PNP or NPN type switching signal), it can be directly connected to the PLC's digital input module without setting up a signal conversion device. An isolator can also be set between the ultrasonic receiver and the PLC to prevent damage to the PLC caused by ground potential differences, surge voltages, etc., while improving the system's anti-interference ability.

[0053] When the monitoring sensor is an infrared thermal imager, different devices are used to connect the infrared thermal imager to the PLC as needed: if the PLC supports direct docking with the interface protocol used by the thermal imager, it can be connected directly through the corresponding communication module (such as RS-485 module, Ethernet module, etc.); if the PLC does not directly support the communication protocol of the thermal imager, it may be necessary to add a protocol converter or gateway device to convert the thermal imager data into a format that the PLC can understand; if the infrared thermal imager only provides switching outputs (such as alarm contacts), a digital input module is set between the infrared thermal imager and the PLC, and the changes in high and low levels indicate whether the temperature threshold has been crossed or whether a specific event has occurred; if the power supplies of the thermal imager and PLC system are incompatible or the distance is far, a separate power adapter or power cord may be required; in some cases, if the output signal of the infrared thermal imager needs to be amplified, filtered, isolated, etc., it may be necessary to add signal conditioning equipment between the two to ensure that the signal quality meets the input requirements of the PLC.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for monitoring the rupture of the electrode foil area, characterized in that: Include: A mounting frame, the mounting frame being provided with at least two first mounting bases (101), and the distance between two adjacent first mounting bases (101) being adjustable; The first mounting base (101) is provided with a rotating member, the rotating member is used to install a monitoring sensor, the angle of the rotating member relative to the first mounting base (101) is adjustable, and the monitoring sensor is used to detect whether the pole piece (8) has a crack.

2. The device for monitoring the rupture of the electrode foil area according to claim 1, characterized in that: The mounting frame comprises a rod, and the first mounting base (101) is externally mounted on the rod.

3. The device for monitoring the rupture of the electrode foil area according to claim 1, characterized in that: The mounting frame comprises a slide rail, and the first mounting base (101) is capable of moving along the slide rail.

4. The device for monitoring the rupture of the electrode foil area according to claim 1, characterized in that: The monitoring sensor comprises an optical fiber transmitter and an optical fiber receiver, and the optical signal emitted by the optical fiber transmitter can be received by the optical fiber receiver; or the monitoring sensor comprises an ultrasonic transmitter and an ultrasonic receiver.

5. The device for monitoring the rupture of the electrode foil area according to claim 4, characterized in that: The optical fiber transmitter and the optical fiber receiver are respectively arranged on the upper side and the lower side of the conveying area of the roller press (7); or, the ultrasonic transmitter and the ultrasonic receiver are respectively arranged on the upper side and the lower side of the conveying area of the roller press (7).

6. The device for monitoring the rupture of the electrode foil area according to claim 1, characterized in that: The monitoring sensor includes an infrared thermal imager.

7. The device for monitoring the rupture of the electrode foil area according to claim 6, characterized in that: The infrared thermal imager is arranged on the upper side of the conveying area of the roller press (7).

8. A roller pressing system, characterized in that: The invention comprises a roller press (7) and a device for monitoring the rupture of the foil area of the pole piece as described in any one of claims 1 to 7.

9. A roller pressing system according to claim 8, characterized in that: It also includes a control module, which is connected to the monitoring sensor and the roller press (7). The monitoring sensor can send a signal to the control module, and the control module can receive the signal sent by the monitoring sensor and start or stop the roller press (7).

10. A roller pressing system according to claim 9, characterized in that: It also includes an alarm module, which is connected to the control module. The control module can send a signal to the alarm module, and the alarm module can receive the signal sent by the control module and the first limit member can send an alarm.

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