Roll core tightness testing device
By setting up a central needle and limiting cylinder structure in the core elasticity test device, combining the second push block and elastic element, the problem of insufficient testing stability is solved, and a more accurate and efficient core elasticity detection is achieved. in mass production.
Patent Information
- Application Number
- CN202420669182.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-02
AI Technical Summary
The test stability of the existing core tightness test devices is insufficient, resulting in a large standard deviation of the test results of the same batch of cores, which may lead to scrapping of qualified products or unqualified products entering the market.
A core elasticity test device is designed, by providing a central needle on the first pushing block to support the central hole of the rolling core, combining the limiting cylinder structure to support the outer side wall of the rolling core, and using the second pushing block and elasticity The components improve testing efficiency and stability, ensuring that the thrust direction is perpendicular to the radial direction of the core.
It effectively avoids the collapse of the core center hole, ensures the stability of the test results, is suitable for large-scale production and testing, and reduces the risk of scrapping of qualified products and unqualified products entering the market.
Smart Images
Figure CN222188789U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a winding core tightness testing device. Background Art
[0002] During the battery production process, the tightness of the battery core winding will affect important indicators such as electrolyte infiltration, battery cycle performance, and battery internal resistance. Therefore, accurately evaluating the winding tightness of the battery core is of great significance to the production and manufacturing of batteries. The existing core tightness testing device generally includes a frame, a fixed seat fixed to the frame, and a push block slidably connected to the frame, wherein the fixed seat is used to fix the core, and the push block can approach and squeeze the core along the axis of the core, and the tightness of the core can be quantitatively judged by detecting the thrust of the push block.
[0003] However, in the actual use of the core tightness testing device, the test results are sometimes unstable, that is, the test results of multiple different cores in the same batch have a large standard deviation, which means that the test stability of the existing core tightness testing device is insufficient. In actual production, occasional misjudgments may occur, resulting in qualified products being scrapped or unqualified products entering the market, and it is difficult to apply it to large-scale production testing. Utility Model Content
[0004] The utility model aims to solve the problem that the existing winding core tightness testing device has insufficient stability, which may cause qualified products to be scrapped or unqualified products to flow into the market, and provides a winding core tightness testing device.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A core tightness testing device comprises a frame, a fixed seat and a first push block, the fixed seat is used to fix the core, at least one of the fixed seat and the first push block is slidably connected to the frame, the fixed seat and the first push block can approach or move away from each other along the axial direction of the core; a center needle is also provided on the side of the first push block facing the fixed seat, the center needle is coaxially arranged with the core, and the center needle and the center hole of the core are gap-matched.
[0007] The installation methods of the frame, the fixed seat and the first push block include but are not limited to the fixed seat being fixed to the frame and the first push block being slidably connected to the frame, the fixed seat being slidably connected to the frame and the first push block being fixed to the frame, and the fixed seat and the first push block being slidably connected to the frame, as long as the first push block and the fixed seat can be moved closer to or farther away from each other to squeeze the core.
[0008] The specific structural forms of the sliding connection include but are not limited to a slide rail and slider mechanism, a pulley mechanism, a screw mechanism, and a hole-shaft fit.
[0009] Ways for the fixing seat to fix the winding core include but are not limited to clamping, adsorption, limiting grooves, and limiting blocks.
[0010] After experimental analysis, the inventor of the utility model discovered that the reason why the existing core tightness testing device has insufficient test stability is that during the process of squeezing the core, the center hole of the core sometimes collapses, resulting in sudden changes in thrust and test results; therefore, the core tightness testing device of the utility model is additionally provided with a center needle on the first push block. When the first push block squeezes the core, the center needle can support the center hole of the core, thereby avoiding the collapse of the center hole of the core, thereby ensuring the stability of the test results, and being more suitable for large-scale production testing.
[0011] As a preferred solution of the utility model, a limiting cylinder structure is provided on one side of the fixing seat facing the first push block, the limiting cylinder structure is coaxially arranged with the winding core, and the limiting cylinder structure is gap-matched with the outer side wall of the winding core.
[0012] In this solution, a limiting cylinder structure is arranged on the fixed seat, which can cooperate with the clearance of the outer wall of the core. When the center needle has supported the center hole of the core, the outer wall of the core can also be supported, thereby ensuring the vertical stability of the core during the downward pressure of the first push block, and then making the thrust direction always perpendicular to the radial direction of the core, so that the test result tends to the true value.
[0013] As a preferred solution of the utility model, the dimension of the limiting cylinder structure along the axis direction of the winding core is greater than or equal to the dimension of the winding core along the axis direction of the winding core.
[0014] This solution further limits the size of the limiting tube structure so that the limiting tube structure can completely cover the winding core, that is, it can form a complete support for the outer wall of the winding core, further ensuring the vertical stability of the winding core during the downward pressing process of the first push block.
[0015] As a preferred solution of the utility model, the distance between the limiting tube structure and the outer side wall of the winding core is G1, 0.025mm≤G1≤0.225mm.
[0016] If the gap between the limit tube structure and the outer wall of the roll core is too large, the support of the limit tube structure to the outer wall of the roll core is insufficient, and the outer wall of the roll core may tilt during the extrusion process, thereby failing to ensure that the thrust direction is always perpendicular to the radial direction of the core and causing inaccurate test results; if the gap between the limit tube structure and the outer wall of the roll core is too small, the extrusion of the core by the limit tube structure will increase the friction inside the core, thereby causing changes in the thrust and also causing inaccurate test results; therefore, this scheme recommends a range of values for the distance between the limit tube structure and the outer wall of the roll core, which can achieve a good support effect while minimizing the impact of the limit tube structure squeezing the core on the test results.
[0017] As a preferred solution of the utility model, a second push block is also slidably connected in the fixed seat. The second push block is located on the side of the winding core away from the first push block. The second push block can approach or move away from the winding core along the axial direction of the winding core, thereby pushing the winding core to move in the direction of the first push block.
[0018] The specific shape of the second pushing block includes but is not limited to a columnar shape, a block shape, or a plate shape, as long as it can abut against the winding core and push the winding core to move when moving toward the winding core.
[0019] The roll core will be deformed after being squeezed, and it is easy to get stuck in the fixed seat after the test. It takes a certain amount of time to pull it out, affecting the test efficiency. Therefore, this solution sets a second push block in the fixed seat to facilitate the separation of the roll core from the fixed seat by pushing and pulling the second push block after the test, thereby improving the efficiency of continuous testing.
[0020] As a preferred solution of the utility model, an elastic element is connected between the second push block and the fixed seat, and the elastic element can drive the second push block to move in the direction of the first push block.
[0021] The elastic element includes but is not limited to a coil spring, a disc spring, and a rubber block; the elastic element drives the second push block to move in the direction of the first push block. For example, if the elastic element is arranged on the side of the second push block away from the first push block, a compression spring is used; if the elastic element is arranged on the side of the second push block toward the first push block, a tension spring is used.
[0022] This solution utilizes the elastic force of the elastic element to drive the second push block to move, which can ensure that the thrust of the second push block is constant and save manpower.
[0023] As a preferred solution of the utility model, a locking structure is further provided between the second push block and the fixing seat, and the locking structure can be locked or released, thereby locking the second push block at a position away from the winding core or releasing the second push block.
[0024] The locking structure includes but is not limited to a latch or a limit block detachably connected to the fixing seat, or a lock buckle movably connected to the fixing seat, as long as the relative position between the second push block and the fixing seat can be locked.
[0025] In this solution, a locking structure is provided for the second push block, so as to avoid the situation that when the first push block is used to squeeze the winding core, the second push block is accidentally triggered, thereby affecting the test result.
[0026] As a preferred solution of the utility model, the locking structure includes a first buckle and a second buckle, the first buckle is connected to the fixed seat, the second buckle is connected to the second push block, the first buckle and the second buckle are engaged with each other to lock the position of the second push block, and the first buckle and the second buckle are separated from each other to release the second push block.
[0027] This solution recommends a specific locking structure. Compared with a detachable connection type locking structure, this solution does not require disassembly or assembly of any components when switching the locking and releasing states of the locking structure, and has higher working efficiency.
[0028] As a preferred solution of the utility model, the distance between the center needle and the inner wall of the center hole of the winding core is G2, 0.095mm≤G2≤0.105mm.
[0029] If the gap between the center needle and the center hole of the core is too large, the center needle will not provide sufficient support for the center hole of the core, and the side wall of the center hole of the core may tilt during the extrusion process, making it impossible to ensure that the thrust direction is always perpendicular to the radial direction of the core, and causing inaccurate test results; if the gap between the center needle and the center hole of the core is too small, the extrusion of the core by the center needle will increase the friction inside the core, thereby causing changes in the thrust and also causing inaccurate test results; therefore, this scheme recommends a range of values for the distance between the center needle and the center hole of the core, which can achieve good support effects while minimizing the impact of the center needle squeezing the core on the test results.
[0030] As a preferred solution of the utility model, a driving device is also provided on the frame, and the driving device is used to drive the fixing seat and the first pushing block to move closer to or away from each other.
[0031] The driving device includes but is not limited to a combination of a linear motor, a hydraulic rod, a cylinder, a rotary motor and a gear rack, as long as it can drive the fixed seat and the first push block to move closer to or away from each other.
[0032] This solution recommends using a driving device to drive the fixed seat and the first push block to move closer to or away from each other, which can better control the thrust of the push block on the winding core, so that the test results will not be affected by the operator's operating level, further improving the test stability.
[0033] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0034] 1. The utility model provides a core tightness testing device that can prevent the central hole of the core from collapsing when the first push block squeezes the core, thereby ensuring the stability of the test result and being suitable for large-scale production testing. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 It is a side view structural schematic diagram of a winding core tightness testing device of the utility model;
[0036] Figure 2 This is a schematic diagram of the main structure of a core tightness testing device of the utility model. Figure 1 ;
[0037] Figure 3 yes Figure 2 The schematic diagram of the local enlarged structure at position Ⅰ in the middle;
[0038] Figure 4 yes Figure 2 Schematic diagram of the local enlarged structure at II in the middle;
[0039] Figure 5 This is a schematic diagram of the main structure of a core tightness testing device of the utility model. Figure 2 ;
[0040] Icons: 1-frame; 2-fixed seat; 21-limiting cylinder structure; 3-first push block; 31-center needle; 4-winding core; 5-second push block; 6-elastic element; 71-first buckle; 72-second buckle. DETAILED DESCRIPTION
[0041] The utility model is described in detail below in conjunction with the accompanying drawings.
[0042] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0043] In the description of the following specific embodiments, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or the orientation or position relationship when the device / apparatus is usually used. These terms of orientation or position relationship are only for the convenience of description or simplification of the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation of the present invention.
[0044] The terms "horizontal", "vertical" and the like do not require the corresponding devices / components / elements to be absolutely horizontal or vertical or suspended, but 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 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 within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation 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 utility model.
[0045] 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.
[0046] The terms "set", "installed", "connected" and "connected" 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 methods in the field. It can be directly connected or indirectly connected through an intermediate medium. It can also be the internal connection of two elements.
[0047] Example 1
[0048] like Figures 1 to 5 As shown, a core tightness testing device adopted in this embodiment includes a frame 1, a fixed seat 2 and a first push block 3, the fixed seat 2 is used to fix the core 4, at least one of the fixed seat 2 and the first push block 3 is slidably connected to the frame 1, the fixed seat 2 and the first push block 3 can approach or move away from each other along the axial direction of the core 4; a center needle 31 is also provided on the side of the first push block 3 facing the fixed seat 2, the center needle 31 is coaxially arranged with the core 4, and the center needle 31 is gap-matched with the center hole of the core 4.
[0049] Specifically, in this embodiment, the first push block 3 is slidably connected to the frame 1 from the top, and a dynamometer is also provided on the top of the first push block 3, and the fixing seat 2 is fixedly arranged relative to the frame 1; during the test, the first push block 3 moves along the Figure 1 Move downward in the vertical direction, thereby squeezing the winding core 4; after the test is completed, the first push block 3 moves along Figure 1 Move upward in the vertical direction to facilitate taking out the winding core 4.
[0050] It should be noted that Figure 2 , Figure 3 , Figure 4 , Figure 5 All from Figure 1 The view obtained by observing from the direction of arrow A, where Figure 2 This is the view before the squeeze test. Figure 5 This is a view after the extrusion test, and in order to facilitate the observation of the center needle 31, the limiting cylinder structure 21 and the winding core 4, the frame 1 is hidden.
[0051] Furthermore, a limiting cylinder structure 21 is provided on one side of the fixing seat 2 facing the first pushing block 3 . The limiting cylinder structure 21 is coaxially arranged with the winding core 4 , and the limiting cylinder structure 21 is gap-matched with the outer side wall of the winding core 4 .
[0052] Furthermore, the dimension of the limiting cylinder structure 21 along the axis direction of the winding core 4 is greater than or equal to the dimension of the winding core 4 along the axis direction of the winding core 4. Figure 2 As shown, the winding core 4 can be completely immersed in the limiting cylinder structure 21 .
[0053] Furthermore, the spacing between the limiting tube structure 21 and the outer wall of the winding core 4 is G1, 0.025mm≤G1≤0.225mm. Specifically, taking the 18650 cylindrical battery winding core 4 as an example, the outer diameter of the winding core 4 is 17.3mm-17.7mm, so the inner diameter of the limiting tube structure 21 of this embodiment is 17.75mm.
[0054] Furthermore, a second push block 5 is slidably connected to the fixed seat 2. The second push block 5 is located on the side of the winding core 4 away from the first push block 3. The second push block 5 can approach or move away from the winding core 4 along the axial direction of the winding core 4, thereby pushing the winding core 4 to move in the direction of the first push block 3. Specifically, Figure 1 and Figure 2 As shown, the bottom of the fixed seat 2 is a hollow structure, and a plurality of slide grooves arranged along the axis direction of the winding core 4 are opened on its side wall; the second push block 5 is a strip structure, and its two ends are respectively slidably connected to the slide grooves on the corresponding sides, so that the second push block 5 can move up and down inside the fixed seat 2; Figure 5 As shown, when the winding core 4 is squeezed and deformed, the bottom of the winding core 4 will become a cone-like shape and extend into the cavity below the fixed seat 2. At this time, by pushing the second push block 5 upward, the winding core 4 can be lifted up from the bottom of the winding core 4 from the limiting cylinder structure 21, making it convenient to replace a new winding core 4.
[0055] Furthermore, an elastic element 6 is connected between the second push block 5 and the fixed seat 2, and the elastic element 6 can drive the second push block 5 to move in the direction of the first push block 3. Specifically, the elastic element 6 of this embodiment is arranged on the side of the second push block 5 away from the first push block 3, and is preferably a compression coil spring, which can have both a large stroke and a large thrust.
[0056] Furthermore, a locking structure is provided between the second push block 5 and the fixing seat 2 , and the locking structure can be locked or released, thereby locking the second push block 5 at a position away from the winding core 4 or releasing the second push block 5 .
[0057] Furthermore, the locking structure includes a first buckle 71 and a second buckle 72, the first buckle 71 is connected to the fixing seat 2, the second buckle 72 is connected to the second push block 5, the first buckle 71 and the second buckle 72 are engaged with each other to lock the position of the second push block 5, and the first buckle 71 and the second buckle 72 are separated from each other to release the second push block 5. Figure 3The figure shows the specific structure of the first buckle 71 and the second buckle 72 adopted in this embodiment. It can be seen that the first buckle 71 and the second buckle 72 are in a buckled state, which can prevent the second push block 5 from accidentally rising when the first push block 3 squeezes the reel 4, resulting in a deviation in the test result; when the second push block 5 needs to be released, the second push block 5 is pressed down to loosen the first buckle 71 and the second buckle 72, and then the second push block 5 is swung left and right to make the first buckle 71 no longer above the second buckle 72, and then the second push block 5 is released, so that the second push block 5 can rise and push the reel 4 under the action of the elastic element 6.
[0058] Furthermore, the distance between the center needle 31 and the inner wall of the center hole of the winding core 4 is G2, 0.095mm≤G2≤0.105mm. Specifically, taking the 18650 cylindrical battery winding core 4 as an example, the diameter of the center hole is 3.5±0.01mm, so the diameter of the center needle 31 in this embodiment is 3.3mm.
[0059] Furthermore, a driving device is also provided on the frame 1, and the driving device is used to drive the fixing seat 2 and the first push block 3 to move closer to or farther from each other. The driving device of this embodiment is specifically a thrust rod, and the two ends of the thrust rod are connected to the frame 1 and the first push block 3 respectively.
[0060] When using the core tightness testing device of this embodiment to perform a test, the following steps can be referred to:
[0061] S1: pre-process the winding core 4 before testing, cut off the upper and lower tabs of the winding core 4; place the winding core 4 inside the limiting cylinder structure 21; ensure that the first buckle 71 and the second buckle 72 are in a buckled state;
[0062] S2: Start the driving device to make the first push block 3 move downward at a constant speed and squeeze the winding core 4, during which the feedback result of the dynamometer is monitored until the target thrust peak value is obtained.
[0063] S3: Start the driving device to reset the first push block 3 upward to prevent the first push block 3 from hindering the removal or replacement of the winding core 4; press down and release the second push block 5, and after the winding core 4 is ejected, prepare to replace the winding core 4 and the next test.
[0064] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A core tightness testing device, comprising a frame (1), a fixed seat (2) and a first push block (3), wherein the fixed seat (2) is used to fix the core (4), at least one of the fixed seat (2) and the first push block (3) is slidably connected to the frame (1), and the fixed seat (2) and the first push block (3) can approach or move away from each other along the axial direction of the core (4), characterized in that: A center needle (31) is also provided on the side of the first push block (3) facing the fixing seat (2); the center needle (31) is coaxially arranged with the winding core (4); and the center needle (31) is gap-matched with the center hole of the winding core (4).
2. A core tightness testing device according to claim 1, characterized in that: A limiting tube structure (21) is provided on one side of the fixing seat (2) facing the first pushing block (3); the limiting tube structure (21) is coaxially arranged with the winding core (4); and the limiting tube structure (21) is gap-matched with the outer side wall of the winding core (4).
3. A core tightness testing device according to claim 2, characterized in that: The dimension of the limiting cylinder structure (21) along the axis direction of the winding core (4) is greater than or equal to the dimension of the winding core (4) along the axis direction of the winding core (4).
4. A core tightness testing device according to claim 2, characterized in that: The distance between the limiting tube structure (21) and the outer side wall of the winding core (4) is G1, 0.025 mm ≤ G1 ≤ 0.225 mm.
5. A core tightness testing device according to any one of claims 1 to 4, characterized in that: A second push block (5) is also slidably connected to the fixed seat (2). The second push block (5) is located on a side of the winding core (4) away from the first push block (3). The second push block (5) can approach or move away from the winding core (4) along the axial direction of the winding core (4), thereby pushing the winding core (4) to move in the direction of the first push block (3).
6. A core tightness testing device according to claim 5, characterized in that: An elastic element (6) is connected between the second push block (5) and the fixed seat (2), and the elastic element (6) is capable of driving the second push block (5) to move in the direction of the first push block (3).
7. A core tightness testing device according to claim 5, characterized in that: A locking structure is also provided between the second push block (5) and the fixed seat (2), and the locking structure is capable of locking or releasing, thereby locking the second push block (5) at a position away from the winding core (4) or releasing the second push block (5).
8. A core tightness testing device according to claim 7, characterized in that: The locking structure comprises a first buckle (71) and a second buckle (72), wherein the first buckle (71) is connected to the fixing seat (2), and the second buckle (72) is connected to the second pushing block (5), and the first buckle (71) and the second buckle (72) are engaged with each other to lock the position of the second pushing block (5), and the first buckle (71) and the second buckle (72) are separated from each other to release the second pushing block (5).
9. A core tightness testing device according to any one of claims 1 to 4, characterized in that: The distance between the center needle (31) and the inner wall of the center hole of the winding core (4) is G2, 0.095mm≤G2≤0.105mm.
10. A core tightness testing device according to any one of claims 1 to 4, characterized in that: The frame (1) is also provided with a driving device, which is used to drive the fixing seat (2) and the first pushing block (3) to move closer to or farther from each other.