A fixture for detecting electrode warpage

Abstract

This utility model relates to an electrode warpage detection fixture, specifically an electrode warpage detection fixture, including an upper plate and a lower plate; a cavity is formed between the upper and lower plates; multiple sets of adsorption holes are opened on the upper plate; it also includes a plunger cylinder with an air intake hole; a connecting valve is installed on the plunger cylinder; a positioning component; including a wedge; when the air pump is working, the adsorption force generated is weakened by the elastic force of the large spring, thereby avoiding the sudden adsorption force generated at the beginning of the air pump starting from acting on the electrode, causing the electrode to deform and thus affecting the warpage detection; it also ensures the stability of the adsorption force during the detection process, avoiding detection errors caused by fluctuations in the adsorption force during the detection process; through the positioning function of the positioning component, the electrode can be matched with all the adsorption holes, so that the electrode can be adsorbed on the upper plate, and the adsorption stability can be ensured, avoiding the electrode slipping during subsequent warpage detection, which would lead to large errors in the detection results.

Description

Technical Field

[0001] This utility model relates to a tooling for detecting electrode warpage, specifically a tooling for detecting electrode warpage. Background Technology

[0002] In lithium-ion battery manufacturing, the flatness (i.e., warpage) of the electrode sheets is a critical quality indicator. Excessive warpage can lead to: difficulties in stacking / winding, inaccurate alignment, and negatively impacting cell structure uniformity and capacity. Furthermore, the warped edges may puncture the separator, causing internal short circuits. Therefore, detecting the warpage of the electrode sheets is extremely important. The purpose of electrode warpage detection fixtures is to fix the electrode sheets in place while preserving their natural state to the greatest extent possible, ensuring the accuracy of the test results. Most commercially available electrode warpage detection fixtures use vacuum adsorption to fix the electrode sheets.

[0003] The vacuum adsorption electrode warpage detection fixture includes an upper plate and a lower plate, which are fixed together by screws, leaving a cavity in the middle that is connected to an air pump. Multiple sets of adsorption holes are formed on the upper plate; all adsorption holes are connected to the cavity. After the electrode is placed on the upper plate, the air pump circulates air, which then adsorbs the electrode through the adsorption holes.

[0004] The size of the upper plate is usually larger than that of the electrode. In order to ensure that the electrode is in its natural state for testing, the electrode is usually placed on the upper plate by dropping it. During the falling process, the electrode may shift in position, that is, one or more sides of the electrode are exposed on the upper plate. In this state, the electrode cannot cooperate with all the adsorption holes. Therefore, the adsorption force of the electrode by air circulation is not high. This makes it easy for the electrode to slip when using a dial indicator or micrometer for subsequent testing, resulting in a large error in the testing structure. Utility Model Content

[0005] The purpose of this invention is to provide an electrode warpage detection fixture to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An electrode warpage detection fixture includes an upper plate and a lower plate; the upper plate and the lower plate are connected by screws to form a cavity;

[0008] The upper plate has multiple sets of adsorption holes that communicate with the cavity;

[0009] It also includes a plunger cylinder, which is mounted on the lower plate and communicates with the cavity; the plunger cylinder has an air intake hole; and a connecting valve for communicating with an air pump and communicating with the air intake hole is installed on the plunger cylinder.

[0010] Positioning components include wedges disposed on the four sides of the upper plate for engaging the adsorption holes with the electrode sheets.

[0011] The electrode warpage detection fixture described above includes: a piston slidably fitted inside the plunger cylinder; a push rod mounted on the piston and slidably and sealingly connected to the plunger cylinder; a large spring wrapped around the push rod; and the two ends of the large spring respectively contacting the plunger cylinder and the piston.

[0012] As described above, the electrode warpage detection fixture has an air intake hole with a diameter greater than the height of the piston.

[0013] The electrode warpage detection fixture described above includes: a positioning component further comprising a groove formed on the upper plate; a slider that slides and engages with the groove on the wedge; a guide post on the wedge; a sleeve that slides and engages with the guide post on the lower plate; a return spring sleeved on the guide post; and the two ends of the return spring contacting the guide post and the sleeve, respectively.

[0014] The electrode warpage detection fixture described above includes a top plate that is slidably mounted on the plunger cylinder and cooperates with the guide post; the top plate and the push rod are fixedly connected by a connecting rod.

[0015] The electrode warpage detection fixture described above includes: multiple sets of pressure relief holes on the upper plate; the pressure relief holes are connected to the cavity; multiple sets of fixing plates are installed on the upper plate, and slide rods are slidably installed on the fixing plates; pressure relief plates for sealing the pressure relief holes are installed on the slide rods; pressure relief springs are wrapped around the slide rods; and the two ends of the pressure relief springs abut against the pressure relief plates and the fixing plates, respectively.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: When the air pump is working, the adsorption force generated will be weakened by the elastic force of the large spring, thereby avoiding the sudden adsorption force generated at the beginning of the air pump starting from acting on the electrode, causing the electrode to deform and thus affecting the warpage detection; it can also ensure the stability of the adsorption force during the detection process, avoiding detection errors caused by fluctuations in the adsorption force during the detection process; through the positioning function of the positioning component, the electrode can be matched with all the adsorption holes, so that the electrode can be adsorbed on the upper plate, and the stability of adsorption can be ensured, avoiding the electrode slipping during subsequent warpage detection, which would lead to large errors in the detection results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the electrode warpage detection fixture.

[0018] Figure 2 This is a schematic diagram of the electrode warpage detection fixture from another perspective.

[0019] Figure 3 This is a schematic diagram of the structure of the electrode warpage detection fixture from an exploded perspective.

[0020] Figure 4 This is a schematic diagram of the suction port in the electrode warpage detection fixture.

[0021] Figure 5 This is a schematic diagram of the adsorption pore structure in the electrode warpage detection fixture.

[0022] Figure 6 This is a schematic diagram of the pressure relief plate in the electrode warpage detection fixture.

[0023] Figure 7 This is a schematic diagram of the pressure relief hole in the electrode warpage detection fixture.

[0024] In the diagram: 1. Upper plate; 101. Slide groove; 102. Adsorption hole; 103. Pressure relief hole; 104. Cavity;

[0025] 2. Lower plate; 201. Sleeve;

[0026] 3. Wedge block; 301. Slider; 302. Guide post;

[0027] 4. Return spring;

[0028] 5. Plunger cylinder; 501. Suction port;

[0029] 6. Connecting valve;

[0030] 7. Piston;

[0031] 8. Top rod;

[0032] 9. Large spring;

[0033] 10. Connecting rod;

[0034] 11. Top slab;

[0035] 12. Pressure relief plate;

[0036] 13. Fixing plate;

[0037] 14. Slide bar;

[0038] 15. Pressure relief spring. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0040] Please see Figures 1-7As an embodiment of this utility model, the electrode warpage detection fixture includes an upper plate 1 and a lower plate 2; the upper plate 1 and the lower plate 2 are connected by screws to form a cavity 104;

[0041] The upper plate 1 has multiple sets of adsorption holes 102 that communicate with the cavity 104;

[0042] It also includes a plunger cylinder 5, which is installed on the lower plate 2 and communicates with the cavity 104; the plunger cylinder 5 is provided with an air intake hole 501; and a connecting valve 6 is installed on the plunger cylinder 5 for communicating with an air pump and communicating with the air intake hole 501.

[0043] Positioning components include wedges 3 disposed on the four sides of the upper plate 1 for engaging the adsorption holes 102 with the electrode sheets.

[0044] In this embodiment, when the air pump is working, it will drive the airflow. The airflow path is: outer surface of upper plate 1 - adsorption hole 102 - cavity 104 - plunger cylinder 5 - air intake hole 501 - connecting valve 6 - air pump.

[0045] Air from the outer surface of the upper plate 1 enters the cavity 104 through the adsorption holes 102. When the electrode is placed on the upper plate 1 and matches all the adsorption holes 102, the flowing air can adsorb the electrode onto the upper plate 1, thus facilitating subsequent warpage detection.

[0046] The wedge 3 is inclined on the side near the middle of the upper plate 1. There are two states when placing the electrode: State 1: The electrode does not contact any of the wedges 3 during placement and can directly cooperate with the adsorption holes 102; State 2: During placement, the electrode position shifts, so that one or more sides contact the inclined surface of the wedge 3. At this time, through the guiding effect of the inclined surface, the electrode slides and cooperates with the inclined surface, so that the electrode slides onto the upper plate 1 and cooperates with all the adsorption holes 102.

[0047] The positioning component enables the electrode to align with all the adsorption holes 102, allowing the electrode to be adsorbed onto the upper plate 1 and ensuring the stability of the adsorption. This prevents the electrode from slipping during subsequent warpage testing, which could lead to large errors in the test results.

[0048] As a further embodiment of this utility model, a piston 7 is slidably fitted inside the plunger cylinder 5; a push rod 8 is mounted on the piston 7 and is slidably and sealingly connected to the plunger cylinder 5; a large spring 9 is wrapped around the push rod 8; the two ends of the large spring 9 respectively abut against the plunger cylinder 5 and the piston 7.

[0049] As a further embodiment of this invention, the diameter of the air intake hole 501 is greater than the height of the piston 7.

[0050] In this embodiment, in the initial state, the piston 7 is located between the intake port 501 and the cavity 104, thereby blocking the airflow.

[0051] When the air pump is working, it will first draw out the air between the piston 7 and the air intake port 501; during this process, the piston 7 will gradually move away from the cavity 104, thereby driving the push rod 8 to slide synchronously and compress the large spring 9.

[0052] Since the diameter of the suction port 501 is greater than the height of the piston 7, the piston 7 will move to the position of contact with the suction port 501, thereby making the suction port 501 connected to the cavity 104, so that air can flow normally and thus adsorb the electrode.

[0053] When the air pump stops working, under the elastic force of the large spring 9, the piston 7 will gradually approach the cavity 104, thereby blocking the air flow again.

[0054] When the air pump is working, the adsorption force generated will be weakened by the elastic force of the large spring 9, thereby avoiding the sudden adsorption force generated at the beginning of the air pump starting from acting on the electrode, causing the electrode to deform and thus affecting the warpage detection; it can also ensure the stability of the adsorption force during the detection process and avoid detection errors caused by fluctuations in the adsorption force during the detection process.

[0055] As a further embodiment of this utility model, the positioning component further includes a sliding groove 101 formed on the upper plate 1; a slider 301 that slides and engages with the sliding groove 101 is installed on the wedge block 3; a guide post 302 is installed on the wedge block 3; a sleeve 201 that slides and engages with the guide post 302 is installed on the lower plate 2; a return spring 4 is sleeved on the guide post 302; and the two ends of the return spring 4 abut against the guide post 302 and the sleeve 201, respectively.

[0056] As a further embodiment of this utility model, the positioning assembly also includes a top plate 11 that is slidably mounted on the plunger cylinder 5 and cooperates with the guide post 302; the top plate 11 and the push rod 8 are fixedly connected by a connecting rod 10.

[0057] In this embodiment, in the initial state, under the elastic force of the large spring 9, the piston 7 is located between the suction hole 501 and the cavity 104. At this time, the top plate 11 and the guide post 302 are in contact; the reset spring 4 is in a compressed state; the wedge block 3 is exposed on the upper plate 1, thereby ensuring that the wedge block 3 can position the electrode during the electrode placement process, so that the electrode and the adsorption hole 102 are engaged.

[0058] The wedge 3 is inclined on the side near the middle of the upper plate 1. There are two states when placing the electrode: State 1: The electrode does not contact any of the wedges 3 during placement and can directly cooperate with the adsorption holes 102; State 2: During placement, the electrode position shifts, so that one or more sides contact the inclined surface of the wedge 3. At this time, through the guiding effect of the inclined surface, the electrode slides and cooperates with the inclined surface, so that the electrode slides onto the upper plate 1 and cooperates with all the adsorption holes 102.

[0059] As the piston 7 moves away from the cavity 104, it will drive the top plate 11 to move synchronously through the connecting rod 10. At this time, the elastic force of the reset spring 4 will drive the guide post 302 to slide on the sleeve 201, so as to drive the wedge block 3 to move and gradually sink into the upper plate 1, thereby avoiding affecting the normal operation of the detection. At this time, the slider 301 will slide inward in the groove 101.

[0060] The positioning component enables the electrode to align with all the adsorption holes 102, allowing the electrode to be adsorbed onto the upper plate 1 and ensuring the stability of the adsorption. This prevents the electrode from slipping during subsequent warpage testing, which could lead to large errors in the test results.

[0061] As a further embodiment of this utility model, the upper plate 1 has multiple sets of pressure relief holes 103; the pressure relief holes 103 are connected to the cavity 104; multiple sets of fixing plates 13 are installed on the upper plate 1, and a slide rod 14 is slidably installed on the fixing plate 13; a pressure relief plate 12 for blocking the pressure relief holes 103 is installed on the slide rod 14; a pressure relief spring 15 is wrapped around the slide rod 14; the two ends of the pressure relief spring 15 abut against the pressure relief plate 12 and the fixing plate 13 respectively.

[0062] In this embodiment, in the initial state, the pressure relief spring 15 has a certain amount of compression, so that the pressure relief plate 12 can tightly squeeze the pressure relief hole 103, thereby sealing the pressure relief hole 103.

[0063] The same airflow velocity results in different adsorption forces on electrodes with different warps. Therefore, when adsorbing different electrodes, it may be possible to adsorb one electrode but not the next; or it may be able to adsorb one electrode without deformation, but when the next electrode is adsorbed, it will be deformed by pressure, thus affecting the test results.

[0064] When the electrode is deformed under pressure, it blocks the adsorption hole 102, causing the pressure inside the cavity 104 to increase. This causes the pressure relief plate 12 to move inward and compress the pressure relief spring 15, opening the pressure relief hole 103. This allows air to enter the cavity 104 through the pressure relief hole 103, weakening the adsorption force at the adsorption hole 102 and restoring the electrode to its original shape. This ensures normal testing and avoids testing deformed electrodes, which could lead to significant deviations between the test results and the actual values.

[0065] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. An electrode warpage detection fixture, comprising an upper plate (1) and a lower plate (2); the upper plate (1) and the lower plate (2) are connected by screws to form a cavity (104); characterized in that The upper plate (1) has multiple sets of adsorption holes (102) that communicate with the cavity (104). It also includes a plunger cylinder (5), which is installed on the lower plate (2) and communicates with the cavity (104); the plunger cylinder (5) is provided with an air intake hole (501); the plunger cylinder (5) is equipped with a connecting valve (6) for communicating with the air pump and communicating with the air intake hole (501). Positioning components include wedges (3) disposed on the four sides of the upper plate (1) for engaging the adsorption holes (102) with the electrode.

2. The pole piece warpage detection tool of claim 1, wherein, A piston (7) is slidably fitted inside the plunger cylinder (5); a push rod (8) is mounted on the piston (7) and is slidably and sealingly connected to the plunger cylinder (5); a large spring (9) is wrapped around the push rod (8); the two ends of the large spring (9) respectively abut against the plunger cylinder (5) and the piston (7).

3. The pole piece warpage detection tool of claim 2, wherein, The diameter of the air intake (501) is greater than the height of the piston (7).

4. The pole piece warpage detection tool of claim 2, wherein, The positioning assembly further includes a groove (101) formed on the upper plate (1); a slider (301) is installed on the wedge (3) and slides into the groove (101); a guide post (302) is installed on the wedge (3); a sleeve (201) is installed on the lower plate (2) and slides into the guide post (302); a return spring (4) is sleeved on the guide post (302); the two ends of the return spring (4) abut against the guide post (302) and the sleeve (201) respectively.

5. The electrode warpage detection fixture according to claim 4, characterized in that, The positioning assembly also includes a top plate (11) that is slidably mounted on the plunger cylinder (5) and cooperates with the guide post (302); the top plate (11) and the push rod (8) are fixedly connected by a connecting rod (10).

6. The electrode warpage detection fixture according to claim 1, characterized in that, The upper plate (1) has multiple sets of pressure relief holes (103); the pressure relief holes (103) are connected to the cavity (104); multiple sets of fixing plates (13) are installed on the upper plate (1), and a slide rod (14) is slidably installed on the fixing plate (13); a pressure relief plate (12) for blocking the pressure relief hole (103) is installed on the slide rod (14); a pressure relief spring (15) is wrapped around the slide rod (14); the two ends of the pressure relief spring (15) abut against the pressure relief plate (12) and the fixing plate (13) respectively.

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