Puncture detection device for lithium battery diaphragm

Abstract

The puncture detection device comprises a supporting plate and a rotating assembly, a supporting frame is arranged on the supporting plate, a puncture air cylinder is arranged on the supporting frame, an output shaft of the puncture air cylinder extends downwards and is connected with a puncture needle, and the rotating assembly is arranged on the supporting plate and comprises a rotating plate and a limiting ring. The rotating plate is horizontally and rotatably arranged on the supporting plate, a plurality of puncture holes are formed in the rotating plate in the circumferential direction, the puncture holes correspond to the puncture needles in the vertical direction, the limiting rings are arranged on the top face of the rotating plate, and the limiting rings and the puncture holes are in one-to-one correspondence and are coaxially arranged. The lithium battery diaphragm puncture strength detection device has the effect of improving the puncture strength detection efficiency of the lithium battery diaphragm.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery separator testing, and in particular to a puncture detection device for lithium battery separators. Background Technology

[0002] A lithium battery separator is a membrane material placed between the positive and negative electrodes of a battery. It is a key component of a lithium battery and is related to the battery's safety. The main working principle of a lithium battery separator is to isolate the positive and negative electrodes and prevent electrons from passing freely through the battery, while allowing ions in the electrolyte to pass freely between the positive and negative electrodes. To ensure the safety of lithium batteries, the production process of lithium battery separators often requires sampling and testing their puncture strength using appropriate puncture detection devices.

[0003] Currently, Chinese patent CN217561164U discloses a device for testing the puncture strength of a battery separator, including an operating table. A fixed base is fixedly connected to one end of the top surface of the operating table, and a motor is installed on the top of the fixed base. Two first rod grooves are opened on the surface of the fixed base. A first threaded rod is movably connected to the middle position of one of the first rod grooves. The top of the first threaded rod passes through the corresponding first rod groove and is fixedly connected to the output end of the motor. A limit rod is fixedly connected to the middle position of the other first rod groove. A first threaded sleeve is threadedly connected to the outer circumferential surface of the first threaded rod, and a limit sleeve is movably sleeved on the outer circumferential surface of the limit rod.

[0004] Regarding the aforementioned technologies, the inventors believe that the battery separator puncture strength testing device can only perform puncture testing on one separator at a time during the testing process. After completing the testing of one separator, the lithium battery separator needs to be removed from the clamping structure above the operating table and a new separator needs to be installed for the next round of puncture strength testing, resulting in low testing efficiency. Utility Model Content

[0005] To improve the efficiency of puncture strength testing for lithium battery separators, this application provides a puncture testing device for lithium battery separators.

[0006] The puncture detection device for lithium battery separators provided in this application adopts the following technical solution:

[0007] A puncture detection device for lithium battery separators includes a support plate and a rotating assembly. A support frame is mounted on the support plate, and a puncture cylinder is mounted on the support frame. The output axis of the puncture cylinder extends downward and is connected to a puncture needle. The rotating assembly is mounted on the support plate and includes a rotating plate and limiting rings. The rotating plate is horizontally rotatable on the support plate. A plurality of puncture holes are formed circumferentially on the rotating plate, and the puncture holes are vertically aligned with the puncture needle. A plurality of limiting rings are arranged on the top surface of the rotating plate, and each limiting ring corresponds to one of the puncture holes and is coaxially arranged.

[0008] By employing the above technical solution, multiple separators to be tested are placed one by one into several limiting rings on a rotating plate, which rotates under the drive of a driving source. When one of the puncture holes rotates to align with the vertical position of the puncture needle, the puncture cylinder is activated, causing the puncture needle to descend. The puncture needle passes through the separator and the puncture hole, performing a puncture test on the separator. After the test is completed, the puncture needle rises, and the rotating plate continues to rotate until the next puncture hole aligns with the puncture needle in the vertical direction. The tested separator is removed from the limiting rings, and a new separator is placed on top, allowing the device to perform continuous puncture testing. Through the cooperation of the support plate and the rotating assembly, continuous puncture testing of multiple separators is achieved, effectively improving the efficiency of puncture strength testing of lithium battery separators.

[0009] Optionally, a base plate is provided parallel to and spaced apart below the support plate. A plurality of support columns are connected between the base plate and the support plate. A communication port is provided on the support plate coaxially with respect to the rotating plate. A plurality of ejection assemblies are provided on the rotating plate. The plurality of ejection assemblies are provided one-to-one with a plurality of limiting rings. Each ejection assembly includes an ejection sleeve, an ejection ring plate, and a contact plate. The ejection sleeve is slidably disposed in the puncture hole. The top end of the ejection sleeve is connected to the ejection ring plate. The bottom end of the ejection sleeve extends through the communication port to the space between the base plate and the support plate. The bottom end of the ejection sleeve is connected to the contact plate. A first driving member is provided on the base plate for driving the ejection sleeve to move in the vertical direction.

[0010] By adopting the above technical solution, after the diaphragm completes the puncture test, the ejector rod slides upward under the action of the first driving component, the ejector ring plate rises and ejects the diaphragm in the limiting ring, realizing the automatic unloading of the diaphragm that has completed the test, which helps to further improve the testing efficiency of the diaphragm.

[0011] Optionally, a return spring is fitted on the ejector sleeve. One end of the return spring is connected to the bottom surface of the rotating plate, and the other end is connected to the top surface of the contact plate. The top surface of the rotating plate is coaxially arranged with respect to the puncture hole in a placement groove corresponding to the shape of the ejector ring plate. In its natural state, the ejector ring plate is embedded in the corresponding placement groove under the action of the return spring. At this time, the top surface of the ejector ring plate is flush with the top surface of the rotating plate.

[0012] By adopting the above technical solution, the reset spring ensures that the top surface of the ejector ring plate is flush with the top surface of the rotating plate when no material is being fed. This allows the diaphragm in the limiting ring to fit tightly against the top surface of the rotating plate, facilitating smoother puncture detection.

[0013] Optionally, the first driving component includes an ejector motor and an ejector cam. The ejector motor is mounted on the base plate, and the ejector cam is connected to the ejector motor in a driving manner. The ejector cam is vertically aligned with the contact plate. When the longer side of the ejector cam contacts the contact plate, the ejector ring plate moves above the rotating plate.

[0014] By adopting the above technical solution, the ejector cam rotates at a specific speed under the drive of the ejector motor. When the longer side of the ejector cam contacts the contact plate, the ejector sleeve and the ejector ring plate rise, ejecting the diaphragm out of the limiting ring.

[0015] Optionally, the top surface of the rotating plate is provided with a mounting ring groove for accommodating the limiting ring. The inner wall of the mounting ring groove is provided with an internal thread, and the outer ring wall of the limiting ring is provided with an external thread. The bottom end of the limiting ring is threadedly connected to the mounting ring groove.

[0016] By adopting the above technical solution, since the limiting ring and the rotating plate are connected by a threaded connection through the mounting ring groove, the height of the limiting ring can be adjusted by screwing on the limiting ring for diaphragms of different thicknesses, thus expanding the applicability of the device.

[0017] Optionally, a limiting component is provided on the limiting ring. The limiting component includes a limiting block, an end block, and a connecting rod. A sliding hole is provided on the inner ring wall of the limiting ring. The limiting block is slidably disposed in the sliding hole. The connecting rod passes through the limiting ring along the radial direction and is slidably connected to it. One end of the connecting rod extends into the sliding hole and is connected to the limiting block. The other end of the connecting rod is connected to the end block. The end of the limiting block away from the end block is hemispherical.

[0018] By adopting the above technical solution, after the diaphragm is placed in the limiting ring, the end block is pushed, and the end of the limiting block moves into the limiting ring. The diaphragm is clamped between the rotating plate and the limiting block, thus achieving the limiting of the diaphragm.

[0019] Optionally, a vacuum pump is provided on the base plate, and a vacuum tube is connected to the vacuum pump. The end of the vacuum tube away from the vacuum pump slides in contact with the edge of the rotating plate. A transverse connecting hole is provided on the rotating plate along the radial direction. One end of the transverse connecting hole is connected to the edge of the rotating plate. A longitudinal connecting hole is provided on the top surface of the rotating plate inside the limiting ring along the vertical direction. The longitudinal connecting hole is connected to the transverse connecting hole. When one of the puncture holes rotates to below the puncture needle, the corresponding transverse connecting hole is connected to one end of the vacuum tube.

[0020] By adopting the above technical solution, when the puncture station moves below the puncture needle, one end of the vacuum tube connects to the transverse connecting hole, and the vacuum pump starts. The vacuum tube, transverse connecting hole, and longitudinal connecting hole are used to evacuate the gap between the diaphragm and the rotating plate. The vacuum pump improves the tightness of the fit between the diaphragm and the rotating plate, further reducing the possibility of the diaphragm sliding on the rotating plate during puncture.

[0021] Optionally, the end of the vacuum tube near the rotating plate is connected to an abutting cone, which is made of an elastic material and abuts against the edge of the rotating plate.

[0022] By adopting the above technical solution, the setting of the abutting cone improves the tightness of the connection between the vacuum tube and the edge of the rotating plate, and reduces the possibility of air leakage between the vacuum tube and the transverse connecting hole during the vacuuming process.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Through the cooperation of the support plate and the rotating component, continuous puncture detection of multiple diaphragms is achieved, which improves the efficiency of puncture strength detection of lithium battery diaphragms.

[0025] 2. The vacuum pump design improves the tightness of the fit between the diaphragm and the rotating plate, further reducing the possibility of the diaphragm sliding on the rotating plate during puncture;

[0026] 3. The ejector assembly enables automatic unloading of the diaphragm after testing, which helps to further improve the testing efficiency of the diaphragm. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the structure of a puncture detection device for lithium battery separators, as described in this application.

[0028] Figure 2This is a partial cross-sectional view used to illustrate the ejector component in the embodiments of this application.

[0029] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0030] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Base plate; 2. Support plate; 21. Communicating port; 3. Rotating assembly; 31. Rotating plate; 311. Puncture hole; 312. Mounting ring groove; 313. Placement groove; 314. Lateral communicating hole; 315. Vacuum ring hole; 316. Longitudinal communicating hole; 32. Rotating shaft; 33. Rotating motor; 34. Rotating gear ring; 35. Rotating gear; 36. Limiting ring; 361. Sliding hole; 4. Limiting... Positioning component; 41. Limiting block; 42. End block; 43. Connecting rod; 44. Limiting spring; 5. Ejection component; 51. Ejection ring plate; 511. Alignment hole; 52. Ejection sleeve rod; 53. Contact plate; 54. Return spring; 55. Ejection motor; 56. Ejection cam; 6. Support column; 7. Support frame; 8. Puncture cylinder; 9. Puncture needle; 10. Vacuum pump; 11. Vacuum tube; 12. Abutment cone. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be further described in detail below. Embodiments of this application provide a puncture detection device for lithium battery separators, which improves the efficiency of detecting the puncture strength of lithium battery separators.

[0033] Reference Figure 1 and Figure 2 A puncture detection device for lithium battery separators includes a base plate 1, a support plate 2, a rotating assembly 3, a limiting assembly 4, and an ejection assembly 5. The base plate 1 is parallel and horizontally disposed on the bottom surface of the support plate 2, and several support columns 6 are vertically fixedly connected between the base plate 1 and the support plate 2. A support frame 7 is disposed on the top surface of the support plate 2, and a puncture cylinder 8 is disposed on the support frame 7. The output shaft of the puncture cylinder 8 extends vertically downward and is connected to a puncture needle 9 for transmission.

[0034] Reference Figure 1 and Figure 2The rotating assembly 3 includes a rotating plate 31, a rotating shaft 32, a rotating motor 33, a rotating gear ring 34, a rotating gear 35, and a limiting ring 36. The rotating plate 31 is horizontally disposed on the top surface of the support plate 2, and a communication port 21 is coaxially disposed on the support plate 2 about the rotating plate 31. The rotating shaft 32 is coaxially and vertically disposed on the bottom surface of the rotating plate 31, and the rotating shaft 32 is rotatably connected to the base plate 1. The rotating gear ring 34 is coaxially connected to the bottom surface of the rotating plate 31. The rotating motor 33 is disposed on the support plate 2, and the output shaft of the rotating motor 33 extends vertically upward and is connected to the rotating gear 35. The rotating gear 35 meshes with the rotating gear ring 34.

[0035] Reference Figure 2 and Figure 3 The rotating plate 31 has a plurality of puncture holes 311 spaced at equal angles along its circumference. When the rotating plate 31 rotates to a certain position, the puncture holes 311 are vertically aligned with the position of the puncture needle 9. The top surface of the rotating plate 31 has a plurality of mounting ring grooves 312, which correspond one-to-one with the puncture holes 311 and are coaxially arranged. A limiting ring 36 is provided in each mounting ring groove 312, and the top of the limiting ring 36 is higher than the top surface of the rotating plate 31. The inner wall of the mounting ring groove 312 has internal threads, and the outer ring wall of the limiting ring 36 has external threads, and the limiting ring 36 is threadedly connected to the mounting ring groove 312.

[0036] Reference Figure 3 and Figure 4 Several sets of ejector components 5 are arranged on the rotating plate 31, with each ejector component 5 corresponding to a number of limiting rings 36. Each ejector component 5 includes an ejector ring plate 51, an ejector sleeve 52, a contact plate 53, a return spring 54, an ejector motor 55, and an ejector cam 56. The ejector sleeve 52 is slidably disposed in the corresponding puncture hole 311, with its top end connected to the ejector ring plate 51 and its bottom end connected to the contact plate 53. The return spring 54 is sleeved on the ejector sleeve 52, with its top end connected to the bottom surface of the rotating plate 31 and its bottom end in contact with the top surface of the contact plate 53. Several placement grooves 313 are formed on the top surface of the rotating plate 31, each placement groove 313 corresponding to a number of puncture holes 311 and coaxially arranged. The shape of the placement grooves 313 corresponds to that of the ejector ring plate 51. In its natural state, the ejector ring plate 51 is embedded in the placement groove 313 under the action of the return spring 54, and the top surface of the ejector ring plate 51 is flush with the top surface of the rotating plate 31. The ejector motor 55 is disposed on the top surface of the base plate 1, and the output shaft of the ejector motor 55 is connected to the ejector cam 56 for transmission. The ejector cam 56 is staggered with the piercing cylinder 8 in the vertical direction. When the rotating plate 31 rotates to a certain position, the contact plate 53 corresponds to the position of the ejector cam 56. When the longer side of the ejector cam 56 contacts the contact plate 53, the ejector ring plate 51 rises above the rotating plate 31.

[0037] Reference Figure 3 A vacuum pump 10 is mounted on the base plate 1. The output end of the vacuum pump 10 is connected to a vacuum tube 11. One end of the vacuum tube 11 extends to one side of the rotating plate 31 and is connected to a contact cone 12. The contact cone 12 is made of an elastic material and fits tightly against the peripheral wall of the rotating plate 31. Several transverse connecting holes 314 are formed along the radial direction on the peripheral wall of the rotating plate 31, and each transverse connecting hole 314 corresponds to a number of limiting rings 36. Several vacuum ring holes 315 are formed in the rotating plate 31, and each vacuum ring hole 315 corresponds to and connects with the transverse connecting holes 314. Several longitudinal connecting holes 316 are formed on the top surface of the rotating plate 31 inside the limiting rings 36 along the vertical direction, and the bottom end of each longitudinal connecting hole 316 connects with the corresponding vacuum ring hole 315. The ejector ring plate 51 has several alignment holes 511, which are corresponding to several longitudinal connecting holes 316. When one of the puncture holes 311 moves to below the puncture needle 9, it abuts against the cone 12 and connects with the corresponding transverse connecting hole 314.

[0038] Reference Figure 2 and Figure 3 A limiting component 4 is disposed on a limiting ring 36. The limiting component 4 includes a limiting block 41, an end block 42, a connecting rod 43, and a limiting spring 44. A sliding hole 361 is provided on the inner ring wall of the limiting ring 36. The limiting block 41 is slidably disposed in the sliding hole 361. The connecting rod 43 passes through the limiting ring 36 radially and is slidably connected to it. One end of the connecting rod 43 is connected to the limiting block 41, and the other end is connected to the end block 42. The limiting spring 44 is sleeved on the connecting rod 43. One end of the limiting spring 44 is connected to the inner bottom wall of the sliding hole 361, and the other end is connected to the limiting block 41. The end of the limiting block 41 away from the end block 42 is hemispherical. In its natural state, the end of the limiting block 41 extends out of the sliding hole 361.

[0039] Reference Figure 3Before testing the diaphragm, several diaphragms are placed one by one in the corresponding limiting rings 36, with the diaphragms sandwiched between the rotating plate 31 and the limiting block 41. For diaphragms of different thicknesses, the limiting rings 36 are screwed down to adjust the distance between the limiting block 41 and the rotating plate 31, expanding the applicability of the device. The rotating motor 33 drives the rotating gear 35 to rotate, causing the rotating gear ring 34 and the rotating plate 31 to rotate under its drive. When one of the puncture stations rotates to below the puncture needle 9, the puncture cylinder 8 is activated, causing the puncture needle 9 to descend and puncture the diaphragm for testing. Simultaneously, one of the transverse connecting holes 314 connects to the vacuum tube 11. The vacuum pump 10 is activated, drawing a vacuum through the vacuum tube 11, transverse connecting hole 314, vacuum ring hole 315, longitudinal connecting hole 316, and alignment hole 511 to evacuate the gap between the diaphragm and the rotating plate 31, improving the tightness of the connection and reducing the possibility of the diaphragm sliding on the rotating plate 31 during puncture. The abutting cone 12 improves the tightness of the connection between the rotating plate 31 and the vacuum tube 11, reducing the possibility of air leakage during the vacuuming process.

[0040] Reference Figure 3 and Figure 4 After the puncture test of the diaphragm is completed, the rotating plate 31 continues to rotate. When the puncture station rotates above the ejector motor 55, the ejector cam 56 rotates and presses against the contact plate 53. The return spring 54 accumulates elastic potential energy, and the ejector ring plate 51 rises, ejecting the tested diaphragm. Driven by the ejector ring plate 51, the limit block 41 retracts into the sliding hole 361, and the limit spring 44 shortens, accumulating elastic potential energy. The ejector assembly 5 enables automatic feeding of the diaphragm, which helps improve the testing efficiency of the diaphragm. The rotating assembly 3 enables continuous testing of the diaphragm, further improving the testing efficiency of the diaphragm.

[0041] The implementation principle of the puncture detection device for lithium battery separators in this embodiment is as follows: Before detecting the separator, several separators are placed one by one in the corresponding limiting rings 36, and the rotating plate 31 rotates. When one of the puncture stations rotates to below the puncture needle 9, the puncture needle 9 descends to perform a puncture detection on the separator. After the puncture detection of the separator is completed, the rotating plate 31 continues to rotate, the ejector cam 56 rotates, the ejector ring plate 51 rises, and ejects the detected separator. The rotating assembly 3 enables uninterrupted detection of the separator, further improving the detection efficiency.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A puncture detection device for lithium battery separators, characterized in that: The assembly includes a support plate (2) and a rotating component (3). A support frame (7) is provided on the support plate (2), and a puncture cylinder (8) is provided on the support frame (7). The output axis of the puncture cylinder (8) extends downward and is connected to a puncture needle (9). The rotating component (3) is provided on the support plate (2). The rotating component (3) includes a rotating plate (31) and a limiting ring (36). The rotating plate (31) is horizontally rotatably provided on the support plate (2). A plurality of puncture holes (311) are provided on the rotating plate (31) along the circumferential direction. The puncture holes (311) are provided vertically in correspondence with the puncture needle (9). A plurality of limiting rings (36) are provided on the top surface of the rotating plate (31). The plurality of limiting rings (36) correspond one-to-one with the plurality of puncture holes (311) and are coaxially arranged.

2. The puncture detection device for lithium battery separators according to claim 1, characterized in that: A base plate (1) is provided parallel to the bottom of the support plate (2). A plurality of support columns (6) are connected between the base plate (1) and the support plate (2). A communication port (21) is provided on the support plate (2) coaxially with respect to the rotating plate (31). A plurality of ejection components (5) are provided on the rotating plate (31). The plurality of ejection components (5) are provided one-to-one with the plurality of limiting rings (36). The ejection component (5) includes an ejection sleeve (52), an ejection ring plate (51), and a connecting rod. The contact plate (53) and the ejector sleeve (52) are slidably disposed in the puncture hole (311). The top end of the ejector sleeve (52) is connected to the ejector ring plate (51). The bottom end of the ejector sleeve (52) extends through the communication port (21) to the space between the bottom plate (1) and the support plate (2). The bottom end of the ejector sleeve (52) is connected to the contact plate (53). The bottom plate (1) is provided with a first driving member for driving the ejector sleeve (52) to move in the vertical direction.

3. The puncture detection device for lithium battery separators according to claim 2, characterized in that: A return spring (54) is sleeved on the ejector sleeve (52). One end of the return spring (54) is connected to the bottom surface of the rotating plate (31), and the other end is connected to the top surface of the contact plate (53). The top surface of the rotating plate (31) is coaxially arranged with respect to the puncture hole (311) in a placement groove (313) that corresponds to the shape of the ejector ring plate (51). In its natural state, the ejector ring plate (51) is embedded in the corresponding placement groove (313) under the action of the return spring (54). At this time, the top surface of the ejector ring plate (51) is flush with the top surface of the rotating plate (31).

4. A puncture detection device for lithium battery separators according to claim 3, characterized in that: The first driving component includes an ejector motor (55) and an ejector cam (56). The ejector motor (55) is mounted on the base plate (1). The ejector cam (56) is connected to the ejector motor (55) in a transmission manner. The ejector cam (56) is vertically aligned with the contact plate (53). When the longer side of the ejector cam (56) contacts the contact plate (53), the ejector ring plate (51) moves above the rotating plate (31).

5. A puncture detection device for lithium battery separators according to claim 2, characterized in that: The top surface of the rotating plate (31) is provided with a mounting ring groove (312) for accommodating the limiting ring (36). The inner wall of the mounting ring groove (312) is provided with an internal thread, and the outer ring wall of the limiting ring (36) is provided with an external thread. The bottom end of the limiting ring (36) is threadedly connected to the mounting ring groove (312).

6. A puncture detection device for lithium battery separators according to claim 5, characterized in that: The limiting ring (36) is provided with a limiting component (4), the limiting component (4) includes a limiting block (41), an end block (42) and a connecting rod (43). A sliding hole (361) is provided on the inner ring wall of the limiting ring (36). The limiting block (41) is slidably disposed in the sliding hole (361). The connecting rod (43) passes through the limiting ring (36) along the radial direction of the limiting ring (36) and is slidably connected to it. One end of the connecting rod (43) extends into the sliding hole (361) and is connected to the limiting block (41). The other end of the connecting rod (43) is connected to the end block (42). The end of the limiting block (41) away from the end block (42) is hemispherical.

7. A puncture detection device for lithium battery separators according to claim 2, characterized in that: A vacuum pump (10) is provided on the base plate (1), and a vacuum tube (11) is connected to the vacuum pump (10). The end of the vacuum tube (11) away from the vacuum pump (10) slides in contact with the edge of the rotating plate (31). A transverse connecting hole (314) is provided on the rotating plate (31) along the radial direction. One end of the transverse connecting hole (314) is connected to the edge of the rotating plate (31). A longitudinal connecting hole (316) is provided on the top surface of the rotating plate (31) inside the limiting ring (36) along the vertical direction. The longitudinal connecting hole (316) is connected to the transverse connecting hole (314). When one of the puncture holes (311) rotates to below the puncture needle (9), the corresponding transverse connecting hole (314) is connected to one end of the vacuum tube (11).

8. A puncture detection device for lithium battery separators according to claim 7, characterized in that: The vacuum tube (11) is connected to an abutting cone (12) at one end near the rotating plate (31). The abutting cone (12) is made of elastic material and abuts against the edge of the rotating plate (31).

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