Pole piece thickness measuring device

Abstract

The utility model relates to the technical field of batteries, and discloses a pole piece thickness measuring device which comprises a platform and a sensor module, and the sensor module is arranged on the platform. The sensor module comprises a first fixing block and two distance measuring sensors, the two distance measuring sensors are fixedly connected to the first fixing block, and the elastic modulus of the first fixing block is 50-60 GPa. The two distance measuring sensors are oppositely arranged, the two distance measuring sensors are arranged in the first direction, one distance measuring sensor is used for measuring the distance between the distance measuring sensor and one surface of the pole piece, and the other distance measuring sensor is used for measuring the distance between the distance measuring sensor and the other surface of the pole piece. The pole piece thickness measuring device disclosed by the utility model can detect the thickness of the pole piece in real time, so that production parameters can be adjusted in time, and all tabs are ensured to be aligned after the pole piece is wound.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, especially relates to a kind of pole piece thickness measuring device. BACKGROUND

[0002] Cylindrical battery needs to be wound layer by layer to form battery cell when producing.Pole piece end is distributed with multiple tabs, and each tab is aligned when pole piece is wound, and then each tab can be connected by welding process.However, the thickness of pole piece fluctuates in production process, which leads to misalignment of tabs in winding process, and further affects the quality of subsequent welding. SUMMARY

[0003] The utility model provides a kind of pole piece thickness measuring device, for measuring pole piece thickness in real time in pole piece winding process, so as to adjust production parameter according to pole piece thickness.

[0004] The utility model provides a kind of pole piece thickness measuring device, including platform and sensor module, the sensor module is set to the platform;

[0005] The sensor module includes first fixed block and two distance sensors, and two distance sensors are respectively fixedly connected to the first fixed block, and the elastic modulus of the first fixed block is 50-60GPa;

[0006] Two distance sensors are oppositely arranged, and two distance sensors are arranged along first direction, wherein one distance sensor is used to measure the distance between one surface of pole piece and another distance sensor is used to measure the distance between another surface of pole piece.

[0007] The electrode thickness measuring device provided by this utility model includes a sensor module comprising a first fixing block and a distance measuring sensor. When measuring the electrode thickness, the electrode can be positioned between two distance measuring sensors. One distance measuring sensor measures the distance S1 between itself and one side surface of the electrode, while the other measures the distance S2. Since the distance S between the two distance measuring sensors is fixed, the electrode thickness S0 = S - S1 - S2. During electrode transport, the sensor module remains fixed, allowing measurement of different areas along the length of the electrode, thus obtaining the continuous thickness along the length. If a difference in thickness is observed at a certain location, it indicates uneven electrode thickness, allowing for timely adjustment of production parameters. Furthermore, the first fixing block has a large elastic modulus, preventing displacement of the distance measuring sensor during operation and ensuring accurate measurement results. Therefore, the electrode thickness measuring device provided by this utility model can accurately detect the electrode thickness, facilitating real-time detection and timely adjustment of production parameters to ensure that the electrode tabs are aligned after winding. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the electrode thickness measuring device in one embodiment of the present invention;

[0009] Figure 2 This is a schematic diagram illustrating the principle of the sensor module measuring the electrode thickness in an embodiment of this utility model.

[0010] Figure 3 This is a schematic diagram of the structure of the guide roller portion in the electrode thickness measuring device in this embodiment of the present invention;

[0011] Figure 4 This is a schematic diagram of the structure of the electrode sheet passing through the guide roller in an embodiment of this utility model.

[0012] In the picture:

[0013] 10-Electrode; 20-Transfer roller; 100-Platform; 200-Sensor module; 210-First fixing block; 220-Distance sensor; 300-Calibration measuring component; 400-Moving module; 410-Guide rail; 420-Drive module; 500-Guide roller; 600-Second fixing block; 610-First mounting groove; 620-First clearance groove; 700-Third fixing block; 710-Second mounting groove; 720-Clearing hole; 800-Fourth fixing block; 810-Second clearance groove. Detailed Implementation

[0014] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0015] Reference Figure 1 The pole piece thickness measuring device in the embodiments of the present application can be used to detect the thickness of the pole piece 10 in real time before the pole piece 10 is wound, so as to monitor the thickness of the pole piece 10 in real time, and when the thickness of the pole piece 10 deviates, the production parameters of the battery cell can be adjusted in time to ensure that the pole pieces 10 are aligned after winding.

[0016] The pole piece thickness measuring device in the embodiments can be arranged near the wound pole piece 10. Since the pole piece 10 needs to be conveyed to the winding position by the conveying mechanism before winding, the pole piece thickness measuring device can measure the thickness of the pole piece 10 during the conveying process.

[0017] As shown in Figure 1 When the pole piece 10 is conveyed, the conveying mechanism is provided with a plurality of conveying rollers 20, and the plurality of conveying rollers 20 are arranged in sequence along the conveying path of the pole piece 10, and the pole piece 10 is rotatably connected with each conveying roller 20. When each conveying roller 20 rotates at a predetermined direction and speed, the pole piece 10 can be conveyed at a predetermined speed towards the winding position. The pole piece 10 at the front end is wound first, and the pole piece 10 at the rear end is continuously conveyed to the winding position under the continuous conveying of the conveying roller 20, and then is wound, until the battery cell is formed.

[0018] As shown in Figure 1 The pole piece thickness measuring device can include a platform 100 and a sensor module 200, and the sensor module 200 is arranged on the platform 100. The platform 100 can support and stabilize the sensor module 200 to keep the sensor module 200 stable during work, thereby improving the accuracy of detection.

[0019] Specifically, the sensor module 200 can include a first fixed block 210 and two distance measuring sensors 220 arranged at intervals, both of which are fixedly connected to the first fixed block 210, that is, the distance between the two distance measuring sensors 220 is fixed. Further, the two distance measuring sensors 220 are oppositely arranged, and the space between the two distance measuring sensors 220 can be used to accommodate the pole piece 10, so that when a part of the pole piece is conveyed between the two distance measuring sensors 220, one of the distance measuring sensors 220 detects the distance between the one of the surfaces of the pole piece 10, and the other distance measuring sensor 220 detects the distance between the other surface of the pole piece 10.

[0020] In this embodiment, the working principle involved in the detection of the thickness of the pole piece 10 by the sensor module 200 is as shown in FIG. 2B. Figure 2 As the distance L between the two distance measuring sensors 220 is fixed, the distance between one of the distance measuring sensors 220 and one of the surfaces of the pole piece 10 is L1, and the distance between the other distance measuring sensor 220 and the other surface of the pole piece 10 is L2, then the thickness H of the pole piece 10 is L-L1-L2.

[0021] In the detection of the thickness of the pole piece 10, the sensor module 200 remains fixed, and different parts of the pole piece 10 pass through the sensor module 200 during the conveying process, so that the sensor module 200 can detect the thickness of different parts of the pole piece 10 along the length direction to obtain the continuous thickness values of the pole piece 10 along the length direction. When the thickness values of different parts are found to deviate, it can be indicated that the thickness of the pole piece 10 is uneven, and at this time, the production parameters of the battery cell can be adjusted in time so that the tabs can be aligned after the winding of the pole piece 10 is completed.

[0022] In specific implementation, the distance measuring sensor 220 may, for example, be a laser sensor, an ultrasonic sensor, an infrared sensor, etc., and the present embodiment is not limited thereto.

[0023] In some embodiments, the elastic modulus of the first fixed block 210 is 50-60 GPa, that is, the stiffness of the first fixed block 210 is very high, and it is not easy to deform under external force impact. When the two distance measuring sensors 220 are both fixed to the first fixed block 210, it can be ensured that the distance measuring sensors 220 remain stable during operation and will not be affected by external forces to affect the accuracy of the thickness measurement of the pole piece 10, thus ensuring the accuracy of the thickness measurement result of the pole piece 10 to better achieve the purpose of tab alignment.

[0024] The material of the first fixed block 210 may, for example, be marble, and the elastic modulus of marble is about 56 GPa, which can well meet the requirement for stiffness. In addition, marble has a relatively low cost, which is also conducive to reducing production costs.

[0025] In some embodiments, the sensor module 200 has a pole piece detection station and a calibration station on the platform 100. When the sensor module 200 is at the pole piece detection station, the sensor module 200 can measure the thickness of the pole piece 10. When the sensor module 200 is at the calibration station, the sensor module 200 can be calibrated to prevent the sensor module 200 from being in an abnormal working state, thereby affecting the measurement results.

[0026] Based on this, continuing to refer to Figure 1 , the pole piece thickness measurement device in the embodiment can further include a calibration measurement piece 300 arranged on the platform 100. The calibration measurement piece 300 can be fixedly connected to the platform 100, so that the calibration measurement piece 300 remains fixed. In the first direction, the calibration measurement piece 300 is located between the two distance sensors 220. When the sensor module 200 is calibrated, its working principle is the same as that of measuring the thickness of the pole piece 10, that is, the two distance sensors 220 are located on both sides of the calibration measurement piece 300 in the first direction. One of the distance sensors 220 detects the distance h1 between the calibration measurement piece 300, and the other distance sensor 220 detects the distance h2 between the calibration measurement piece 300. Then the measured thickness h0 of the calibration measurement piece 300 can be calculated as L-h1-h2. Comparing the calculated thickness of the calibration measurement piece 300 with the actual thickness of the calibration measurement piece 300, if the values of the two are the same, it means that the sensor module 200 is in a normal working state, if the values of the two are different, it means that the sensor module 200 has deviation, which needs to be adjusted manually.

[0027] Further, the pole piece detection station and the calibration station can be arranged in the second direction, wherein the second direction is perpendicular to the first direction, and the plane in which the first direction and the second direction lie is parallel to the plane of the platform 100 for arranging the sensor module 200. Based on this, the pole piece thickness measurement device in the embodiment can further include a moving module 400, which can be used to drive the sensor module 200 to move in the second direction, so that the sensor module 200 can be switched between the pole piece detection station and the calibration station.

[0028] As an optional implementation, continuing to refer to Figure 1 , the moving module 400 is arranged on the platform 100. The moving module 400 can include a guide rail 410 and a driving module 420. The guide rail 410 is fixedly connected to the platform 100, and the guide rail 410 extends in the second direction. The first fixed block 210 can be installed on the guide rail 410 through a sliding block, and the driving module 420 is used to drive the first fixed block 210 to move in the second direction relative to the sliding rail, so as to realize the movement of the distance sensor 220 module 200 in the second direction.

[0029] In some embodiments, the pole piece thickness measuring device can further comprise a guiding module, which can be used to guide the pole piece 10 passing through the guiding module so that the part of the pole piece 10 passing through the guiding module is perpendicular to the first direction. It can be understood that when the pole piece 10 is perpendicular to the first direction, the distance between each area of the two side surfaces of the pole piece 10 and the corresponding distance measuring sensor 220 can be ensured to be the same, so as to ensure the accuracy of the pole piece 10 thickness measured by the distance measuring sensor 220.

[0030] In particular, with reference to Figure 3 and Figure 4 , the guiding module can comprise two guiding rollers 500 arranged along a third direction, where the third direction is perpendicular to the first direction and perpendicular to the second direction. As described above, when the pole piece 10 is conveyed by the plurality of conveying rollers 20, the two guiding rollers 500 are arranged corresponding to the two adjacent conveying rollers 20 arranged along the third direction as the auxiliary guiding structure. That is, in a set of guiding rollers 500 and conveying rollers 20, the two are arranged along the first direction, and the guiding rollers 500 are close to the conveying rollers 20, so that when the conveying rollers 20 convey the pole piece 10, the pole piece 10 passes through the gap between the conveying rollers 20 and the guiding rollers 500, and the two sides of the pole piece 10 can be in contact with the guiding rollers 500 and the conveying rollers 20, respectively.

[0031] The distance between the conveying rollers 20 and the guiding rollers 500 can be the same as the standard thickness of the pole piece 10, or slightly larger than the standard thickness of the pole piece 10. When the pole piece 10 passes through the gap between the conveying rollers 20 and the guiding rollers 500, the guiding rollers 500 and the conveying rollers 20 can cooperate to guide the pole piece 10, so that the tangent line of the pole piece 10 tangent to the conveying rollers 20 is parallel to the third direction. At this time, since the tangent line of the part of the pole piece 10 passing through the two adjacent conveying rollers 20 is parallel to the third direction, it can be ensured that the part of the pole piece 10 between the two adjacent conveying rollers 20 extends along the third direction, that is, perpendicular to the first direction. In this way, when the distance measuring sensor 220 measures the thickness of the pole piece 10, the accuracy of the measurement result of the distance measuring sensor 220 can be ensured.

[0032] Further, with reference to Figure 1 and Figure 3The platform 100 is further provided with a second fixing block 600 fixedly connected to the platform 100. The two guide rollers 500 are fixedly connected to the second fixing block 600, and the elastic modulus of the second fixing block 600 is 50-60 GPa. It can be understood that, since the elastic modulus of the second fixing block 600 is large, the rigidity is high, and it is not easy to deform under external impact. Even if the measuring device in the embodiment vibrates during the measurement process, the guide roller 500 will not deviate under the action of the second fixing block 600, so as to ensure that the pole piece 10 moves in the third direction when passing through the guide roller 500, thereby ensuring the accuracy of the measurement result.

[0033] In addition, the platform 100 is further provided with a third fixing block 700 fixedly connected to the platform 100. The two conveying rollers 20 cooperating with the guide roller 500 to guide the pole piece 10 can be installed on the third fixing block 700, and the conveying roller 20 can rotate around its own axis relative to the third fixing block 700, thereby playing a role in conveying the pole piece 10.

[0034] The elastic modulus of the third fixing block 700 is 50-60 GPa, so as to ensure that the conveying roller 20 can only rotate around its own axis when the conveying roller 20 rotates, and will not deviate in other directions, thereby cooperating with the guide roller 500 to guide the pole piece 10.

[0035] In the embodiment, as shown in Figure 3 The second fixing block 600 is provided with a first mounting slot 610, and the opening of the first mounting slot 610 faces the third fixing block 700. The third fixing block 700 is provided with a second mounting slot 710, and the opening of the second mounting slot 710 faces the second fixing block 600. At this time, the second mounting slot 710 and the third mounting slot are communicated, so that the pole piece 10 can pass between the conveying roller 20 and the guide roller 500.

[0036] Further, the platform 100 is further provided with a fourth fixing block 800 and a driving assembly for driving the conveying roller 20 to rotate. The fourth fixing block 800 is fixedly connected to the platform 100, and the driving assembly is fixedly connected to the fourth fixing block 800. The driving assembly can be arranged on the side of the third fixing block 700 away from the second fixing block 600, and the driving assembly is located between the third fixing block 700 and the fourth fixing block 800, so that the driving assembly can be connected with the conveying roller 20 while being fixed to the fourth fixing block 800.

[0037] The elastic modulus of the fourth fixing block 800 can also be 50-60 GPa, so as to ensure that the driving assembly remains stable during operation.

[0038] Similarly, the elastic module of the platform 100 can also be 50-60 GPa. Since the sensor module 200, the moving module 400, and the fixing blocks are all fixed on the platform 100, when the rigidity of the platform 100 is high, the stability of the whole measuring device can be maintained. At this time, even if the platform 100 is placed on a rack, when the rack is vibrated by external force, the platform 100 will not be vibrated together, ensuring the stability of the platform 100.

[0039] The materials of the platform 100, the second fixing block 600, the third fixing block 700, and the fourth fixing block 800 can all be marble, which can reduce the production cost while ensuring the rigidity. In addition, the second fixing block 600 and the third fixing block 700 can be relatively fixed by a connecting piece, and the third fixing block 700 and the fourth fixing block 800 can also be relatively fixed by a connecting piece, so as to maintain the stability of the whole.

[0040] On this basis, referring to Figure 3 or Figure 4 In order to avoid the second fixing block 600, the third fixing block 700, and the fourth fixing block 800 interfering with the measurement of the sensor module 200, the second fixing block 600 and the fourth fixing block 800 are respectively provided with a first avoiding slot 620 and a second avoiding slot 810. The first avoiding slot 620 and the second avoiding slot 810 both extend along the second direction, wherein the first avoiding slot 620 is in communication with the first mounting slot 610, and the second avoiding slot 720 is in communication with the second mounting slot 710. Moreover, the openings of the first avoiding slot 620 and the second avoiding slot 810 are both towards the side of the sensor module 200.

[0041] The third fixing block 700 is also provided with an avoiding hole 720, which at least partially overlaps with the first avoiding slot 620 and the second avoiding slot 810 in the first direction. The avoiding hole 720 can be used to expose the pole piece 10 between the second fixing block 600 and the third fixing block 700, so as to facilitate the measurement of the distance measuring sensor 220.

[0042] When the sensor module 200 moves towards the pole piece 10 along the second direction, the distance measuring sensors 220 on both sides can respectively move relative to the first avoiding slot 620 and the second avoiding slot 810, so that in the second direction, the two distance measuring sensors 220 are respectively located in the first avoiding slot 620 and the second avoiding slot 810. At this time, one of the distance measuring sensors 220 is located on the side of the third fixing block 700 away from the second fixing block 600 and is opposite to the avoiding hole 720, and the other distance measuring sensor 220 can be extended into the first mounting slot 610 from the first avoiding slot 620.

[0043] It is worth mentioning that, as Figure 3As shown, when the second fixing block 600 and the third fixing block 700 are arranged, the calibration measuring member 300 can be fixed to the side of the second fixing block 600 or the third fixing block 700 facing the sensor module 200 in the second direction. In this way, not only can the calibration measuring member 300 be arranged close to the sensor module 200, but also can be kept fixed so that the sensor module 200 can be accurately calibrated when calibrated.

[0044] In some embodiments, the pole piece thickness measuring device can further comprise a blowing module (not shown in the figure), which can be used for blowing to facilitate blowing away the surrounding dust. Specifically, in the first direction, the blowing module can be located between the two distance measuring sensors 220, and when the distance measuring sensors 220 are working, the blowing module can blow to avoid dust adhering to the surface of the distance measuring sensors 220 and affecting the accuracy of the measurement results.

[0045] In particular implementation, the blowing module can be fixedly connected with the first fixing block 210, so that not only can the blowing module be kept stable when working, but also the blowing module can be arranged close to the distance measuring sensors 220 to achieve better dust removal effect.

[0046] In the present embodiment, a driving device for driving the blowing module to work is further included, which can be fixed to the fourth fixing block 800, for example, to keep stable during working process.

[0047] In some embodiments, the pole piece thickness measuring device can further comprise a temperature and humidity compensation module (not shown in the figure), which can comprise a temperature sensor, a humidity sensor and a processing module. The temperature sensor can be used to detect the temperature around the sensor module 200, the humidity sensor can be used to detect the humidity around the sensor module 200, and the processing module can be used to receive the temperature signal and the humidity signal sent by the temperature sensor and the humidity sensor respectively, and process according to the signals sent.

[0048] Specifically, the pole piece thickness measuring device in the present embodiment and the winding mechanism for winding the pole piece 10 are housed in a cover body, and the temperature sensor and the humidity sensor are arranged inside the cover body and are used to detect the temperature inside the cover body. The processing module can compare the signals detected by the temperature sensor and the humidity sensor with the temperature and humidity outside the cover body, and if there is a certain difference, the difference will be fed back. At this time, the measurement of the sensor module 200 can be adaptively adjusted according to the difference in temperature and humidity, so as to obtain accurate measurement value.

[0049] In addition, a filtering data collection system can be arranged to collect each group of data measured by the sensor module 200 and determine whether the collected data is valid or not.

[0050] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A pole piece thickness measuring device characterized by, The platform and a sensor module are included, and the sensor module is arranged on the platform; The sensor module includes a first fixed block and two distance measuring sensors, and the two distance measuring sensors are fixedly connected to the first fixed block, and the elastic modulus of the first fixed block is 50-60 GPa; The two distance measuring sensors are oppositely arranged, and the two distance measuring sensors are arranged along a first direction, wherein one of the distance measuring sensors is used for measuring the distance between the one surface of the pole piece and the other distance measuring sensor is used for measuring the distance between the other surface of the pole piece.

2. The pole piece thickness measuring device of claim 1, wherein A moving module is further included, and the moving module is arranged on the platform; The first fixed block is connected to the moving module, and the moving module is used to drive the sensor module to move to a pole piece detection station along a second direction towards the pole piece, so that the two distance measuring sensors are located on the opposite sides of the pole piece, respectively. The second direction is perpendicular to the first direction.

3. The pole piece thickness measuring device of claim 2, wherein The moving module includes a guide rail and a driving module, the guide rail extends along the second direction, the first fixed block is installed on the guide rail through a sliding block, and the driving module is used to drive the fixed block to move along the second direction relative to the guide rail.

4. The pole piece thickness measuring device of claim 2, wherein A calibration measuring piece arranged on the platform is further included, and the calibration measuring piece is used to assist the sensor module in calibration; The calibration measuring piece and the pole piece detection station are arranged at intervals along the second direction, and the moving module is further used to drive the sensor module to move to the calibration measuring piece along the second direction, so that the two distance measuring sensors are located on the two sides of the calibration measuring piece along the first direction, respectively.

5. The pole piece thickness measuring device of claim 1, wherein A guide module is further included, and the guide module is used to guide the pole pieces passing through the guide module, so that part of the pole pieces passing through the guide module are perpendicular to the first direction.

6. The pole piece thickness measuring device of claim 5, wherein The guide module includes two guide rollers arranged along a third direction, and the two guide rollers are correspondingly arranged with two adjacent conveying rollers used for conveying the pole pieces; The guide rollers are close to the conveying rollers, so that the pole pieces pass through the gap between the conveying rollers and the guide rollers.

7. The pole piece thickness measuring device of claim 6, wherein A second fixed block is further included, the second fixed block is fixedly connected with the platform, and the elastic modulus of the first fixed block is 50-60 GPa, and the guide rollers are fixedly connected with the second fixed block.

8. The pole piece thickness measuring device of claim 1, wherein, A blowing module is further included, and the blowing module is located between the two distance measuring sensors along the first direction.

9. The pole piece thickness measuring device of claim 1, wherein, A temperature sensor and a humidity sensor are further included, the temperature sensor is used to detect the temperature around the sensor module, and the humidity sensor is used to detect the humidity around the sensor module.

10. The pole piece thickness measuring device according to any one of claims 1 to 9, characterized in that The elastic modulus of the platform is 50-60 GPa.

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