Clamping needle, clamping needle mechanism and battery cell winding equipment

Abstract

The utility model discloses a clamping needle, a clamping needle mechanism and a battery core winding device, the clamping needle is used for penetrating and opening an inner ring of a winding battery core, the clamping needle comprises a clamping needle body with a flat supporting part and a fixing part, the clamping needle body is at least provided with an air outlet structure on the side edge of the supporting part used for opening the inner ring of the winding battery core, and the air outlet structure is arranged on the clamping needle body. An air inlet structure communicated with the air outlet structure is at least formed in the tight supporting part; an inlet of the air outlet structure penetrates through the end, away from the tight supporting part, of the fixing part. At least the side edges of the top face and the bottom face of the tight supporting part are of a prismatic structure or a fillet structure. The supporting and tightening part and the fixing part of the clamping needle body are integrally formed; the air inlet structure and the air outlet structure of the clamping needle body are coated with polytetrafluoroethylene coatings; the utility model can solve the problem that when the winding needle is drawn out, static electricity attached to the surface of the inner diaphragm of the winding battery cell can adsorb the winding needle, and the friction force for winding and tightening the inner diaphragm is instantly increased, so that the inner diaphragm of the winding battery cell is partially drawn out.

Description

Technical Field

[0001] This utility model relates to the technical field of winding battery cell feeding equipment, specifically to a clamping needle, a clamping needle mechanism, and a battery cell winding equipment. Background Technology

[0002] In the production of lithium-ion battery cells, removing the wound cells from the winding needle is a crucial operation. During the forming and unloading process of wound batteries, a winding needle and a chuck typically work together to hold the semi-finished wound cell. The winding needle rotates the cell, while the chuck uses two thin metal strips to clamp the cell at the contact point with the needle. Simultaneously, the winding needle retracts and pulls out, detaching the wound cell and unloading it. However, during unloading, static electricity on the surface of the inner separator of the wound cell can cause it to adhere to the surface of the winding needle. This results in a sudden increase in friction as the needle is pulled out, causing partial removal of the inner separator. Utility Model Content

[0003] The present invention aims to solve the above-mentioned technical problem, namely, when the winding needle is pulled out, the static electricity attached to the surface of the inner diaphragm of the wound cell will attract the winding needle, and the friction force of the inner diaphragm winding and tightening will increase instantly, resulting in the inner diaphragm of the wound cell being partially pulled out.

[0004] In a first aspect, the present invention provides a clamping needle for inserting and opening the inner ring of a wound battery cell. The clamping needle includes a clamping needle body having a flat tightening portion and a fixing portion. The clamping needle body has an air outlet structure formed at least on the side of the tightening portion for opening the inner ring of the wound battery cell, and an air inlet structure communicating with the air outlet structure is formed at least in the tightening portion.

[0005] This application provides air outlet structures on both sides of the clamping part of the clamping needle body and an air inlet structure connected to the air outlet structures within the clamping part. By introducing ion air into the air inlet structure, the ion air can be blown out towards the surface of the inner diaphragm of the wound battery cell through the air outlet structure to remove static electricity from the surface of the inner diaphragm of the wound battery cell, preventing the inner diaphragm of the wound battery cell from generating static electricity and adsorbing onto the surface of the clamping needle. This reduces the problem of core pulling when the inner diaphragm of the wound battery cell is pulled out with the clamping needle, thereby improving the molding quality and molding efficiency of the wound battery cell. After the clamping part of the clamping needle body contacts and clamps the inner ring of the wound battery cell...

[0006] In the preferred embodiment of the above-mentioned clamping needle, the air outlet structure is a combination of through holes symmetrically opened on both sides of the clamping needle body support portion, which connect to the air inlet structure.

[0007] In the preferred embodiment of the above-mentioned clamping needle, the air outlet structure is a flat air inlet that is symmetrically opened on both sides of the clamping needle body support portion and connects to the air inlet structure.

[0008] In the preferred embodiment of the above-mentioned clamping needle, the inlet of the air outlet structure passes through the fixing part at the end away from the supporting part.

[0009] In the preferred embodiment of the above-mentioned clamping needle, at least the sides of the top and bottom surfaces of the supporting part are prismatic or rounded.

[0010] In the preferred embodiment of the above-mentioned clamping needle, the supporting part and the fixing part of the clamping needle body are integrally formed.

[0011] In the preferred embodiment of the above-mentioned clamping needle, the air inlet and air outlet structures of the clamping needle body are coated with polytetrafluoroethylene.

[0012] In a second aspect, the present invention also provides a clamping needle mechanism, including a first clamping needle and a second clamping needle arranged sequentially along the direction of spreading the inner ring of the wound battery cell, and a first driving device for controlling the first clamping needle and the second clamping needle to move closer to or further away from each other; wherein the first clamping needle and / or the second clamping needle are clamping needles as described above.

[0013] In the preferred embodiment of the above-mentioned needle clamping mechanism, the needle clamping mechanism further includes a second driving device for connecting to the first driving device, the second driving device being used to control the first driving device to reciprocate along the length direction of the wound cell.

[0014] In a third aspect, the present invention also provides a battery cell winding device, the battery cell winding device including the aforementioned clamping pins and / or the aforementioned clamping pin mechanism.

[0015] The beneficial effects of this utility model are that by introducing ion wind into the air inlet structure, the ion wind can be blown out towards the surface of the inner diaphragm of the wound battery cell through the air outlet structure to remove static electricity from the surface of the inner diaphragm of the wound battery cell, preventing the inner diaphragm of the wound battery cell from generating static electricity and adsorbing onto the surface of the winding needle, thereby reducing the problem of core pulling when the inner diaphragm of the wound battery cell is pulled out, improving the molding quality and molding efficiency of the wound battery cell. After the clamping part of the clamping needle body contacts and clamps the inner ring of the wound battery cell. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention;

[0017] Figure 2 This is a top view of the present invention;

[0018] Figure 3 This is the right view of the present invention;

[0019] Figure 4 This is a schematic diagram of the internal structure of the clamping needle body;

[0020] Figure 5 This is a schematic diagram showing the first and second clamping pins inserted into the wound battery cell.

[0021] Figure 6 This is a schematic diagram of the needle clamping mechanism;

[0022] In the figure: 1. Winded battery cell; 2. Clamping pin body; 21. Supporting part; 22. Fixing part; 3. Air outlet structure; 4. Air inlet structure; 51. First clamping pin; 52. Second clamping pin; 53. First driving device. Detailed Implementation

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply 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.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] As pointed out in the background art, when the needle is pulled out, the static electricity on the surface of the inner diaphragm of the wound battery cell 1 will attract the needle, and the friction force of the inner diaphragm winding and tightening will increase instantly, causing the inner diaphragm of the wound battery cell 1 to be partially pulled out. This utility model provides a clamping needle, which aims to remove the static electricity on the surface of the inner diaphragm of the wound battery cell 1 by opening air outlet structures 3 on both sides of the clamping part 21 of the clamping needle body 2 and opening an air inlet structure 4 connected to the air outlet structure 3 in the clamping part 21. By introducing ion wind into the air inlet structure 4, the ion wind can be blown out towards the surface of the inner diaphragm of the wound battery cell 1 through the air outlet structure 3, so as to remove the static electricity on the surface of the inner diaphragm of the wound battery cell 1, prevent the inner diaphragm of the wound battery cell 1 from generating static electricity and attracting the surface of the needle, thereby reducing the problem of core pulling of the inner diaphragm of the wound battery cell 1 when the needle is pulled out, improving the molding quality and molding efficiency of the wound battery cell 1. After the clamping part 21 of the clamping needle body 2 contacts and clamps the inner ring of the wound battery cell 1.

[0026] like Figures 1 to 5 As shown, the clamping needle of this utility model is used to pass through and open the inner ring of the wound battery cell 1. The clamping needle includes a clamping needle body 2 having a flat tightening part 21 and a fixing part 22. The clamping needle body 2 has an air outlet structure 3 formed at least on the side of the tightening part 21 used to open the inner ring of the wound battery cell 1, and an air inlet structure 4 communicating with the air outlet structure 3 is formed at least in the tightening part 21.

[0027] See Figure 1 The clamping needle body 2 includes a supporting part 21 and a fixing part 22. The overall structure of the clamping needle body 2 is flat so that it can be inserted into the inner ring of the wound battery cell 1 and tighten the wound battery cell 1. It should be noted that the corners of the flat clamping needle body 2 are not rectangular to avoid damaging the wound battery cell 1 when the clamping needle body 2 tightens the wound battery cell 1.

[0028] See Figures 1 to 3 The clamping part 21 of the clamping needle body 2 is used to extend into the inner ring of the winding cell 1. The length of the clamping part 21 is greater than or equal to the length of the winding cell 1, so as to ensure the clamping effect of the clamping needle body 2 on the winding cell 1 and avoid the problem that the un-clamped part of the winding cell 1 will bend due to the length of the winding cell 1 being greater than the length of the clamping part 21 of the clamping needle body 2, which would cause damage to the winding cell 1.

[0029] See Figure 2 The fixing part 22 of the clamping needle body 2 is connected to one end of the supporting part 21. When the wound battery cell 1 is opened, the fixing part 22 of the clamping needle body 2 does not extend into the wound battery cell 1. The fixing part 22 is used to connect with external equipment, so as to facilitate the external equipment to form automated control of the clamping needle body 2 and improve the efficiency of opening and unloading the wound battery cell 1.

[0030] See Figures 1 to 3The clamping part 21 of the clamping needle body 2 has six surfaces, namely a first surface, a second surface, a third surface and a fourth surface arranged in circumferentially, and a fifth surface and a sixth surface arranged vertically; wherein, the first surface of the clamping part 21 is connected to the fixing part 22, and one of the second surface and the fourth surface of the clamping part 21 is used to move in the inner circle of the wound cell 1 to open the wound cell 1, that is, at least one of the second surface and the fourth surface of the clamping part 21 forms an air outlet structure 3, and the air outlet structure 3 is connected to the air inlet structure 4 opened in the clamping part 21.

[0031] When unloading the wound battery cell 1 after adhesive application, the clamping part 21 of the clamping pin body 2 first extends into the wound battery cell 1 and positions the clamping part 21 within the wound battery cell 1. After the clamping part 21 is positioned, an external ion wind generator generates ion wind, which is then transported through a pipeline to the air inlet structure 4 formed inside the clamping pin body 2. Since the air outlet structure 3 on the second and fourth surfaces of the clamping part 21 is connected to the air inlet structure 4 inside the clamping part 21, the ion wind can be blown out towards the inner ring of the wound battery cell 1 through the second and fourth surfaces of the clamping part 21. Upon contact, the ion wind can remove static electricity from the surface of the inner diaphragm of the wound battery cell 1, preventing the inner diaphragm of the wound battery cell 1 from generating static electricity and adsorbing onto the surface of the winding needle. This reduces the problem of core pulling when the inner diaphragm of the wound battery cell 1 is pulled out, thus improving the molding quality and molding efficiency of the wound battery cell 1. After the clamping part 21 of the clamping needle body 2 contacts and clamps the inner ring of the wound battery cell 1, the winding needle that is winding the wound battery cell 1 can be loosened and pulled out. After the winding needle is pulled out of the inner ring of the wound battery cell 1, the battery cell is picked up by the robot arm so that the clamping part 21 of the clamping needle body 2 can exit the inner ring of the wound battery cell 1. Then, the molded battery cell can be flipped and unloaded by the robot arm.

[0032] Furthermore, it should be noted that the clamping part 21 of the clamping needle body 2 enters the wound cell 1 and blows out ion wind toward the inner diaphragm of the wound cell 1, which can blow away the magnetic powder and magnetic material of the electrode sheet adsorbed on the inner side of the diaphragm of the wound cell 1 from the surface of the inner diaphragm of the wound cell 1, thereby improving the molding quality of the wound cell 1. When the clamping part 21 of the clamping needle body 2 exits the wound cell 1, the ion wind is always blown out through the second and fourth surfaces of the clamping part 21, so as to reduce the problem of the inner diaphragm of the wound cell 1 being pulled out along with the clamping part 21 of the clamping needle body 2.

[0033] In one specific embodiment, the length of the clamping part 21 of the needle body 2 is 200-500mm, the width is 10-15mm, and the thickness is 3-8mm. In another specific embodiment, the length of the clamping part 21 is 200mm, the width is 10mm, and the thickness is 3mm; or, the length of the clamping part 21 is 500mm, the width is 15mm, and the thickness is 8mm; or the length of the clamping part 21 is 300mm, the width is 12mm, and the thickness is 5mm. It should be noted that the length, width, and thickness of the clamping part 21 are selectable and need to be selected according to actual production needs; the specific values ​​are not limited.

[0034] In one specific embodiment, the length of the fixing part 22 of the clamping needle body 2 is 1 / 5 to 1 / 3 of the length of the supporting part 21, the width is 10-15 mm, and the thickness is 3-8 mm. In another specific embodiment, the length of the fixing part 22 is 40 mm, the width is 10 mm, and the thickness is 3 mm; or, the length of the fixing part 22 is 70 mm, the width is 15 mm, and the thickness is 8 mm; or the length of the fixing part 22 is 40 mm, the width is 12 mm, and the thickness is 5 mm. It should be noted that the length, width, and thickness of the fixing part 22 are selectable and need to be selected according to actual production needs; the specific values ​​are not limited. In addition, the width of the fixing part 22 is generally equal to the width of the supporting part 21, and the thickness and length of the fixing part 22 are less than the thickness and length of the supporting part 21.

[0035] In the first embodiment of the air outlet structure 3, the air outlet structure 3 is a combination of through holes symmetrically opened on both sides of the clamping part 21 of the needle clamp body 2, connecting the air inlet structure 4.

[0036] See Figure 1 Through holes are formed on the second and fourth surfaces of the clamping part 21 of the clamping needle body 2. Several through holes are provided along the length of the clamping part 21 so that the ion wind formed on the second and fourth surfaces of the through holes can be evenly blown to the surface of the inner ring diaphragm of the wound cell 1, ensuring the removal of static electricity and magnetic powder from the surface of the inner ring diaphragm of the wound cell 1.

[0037] In one possible implementation, the diameters of adjacent through holes can be configured to be non-equal; this arrangement enables the ion gas flow blown out of the small-diameter through holes to have greater energy, further improving the removal effect of static electricity and magnetic substances on the surface of the inner ring diaphragm of the wound cell 1.

[0038] In the second embodiment of the air outlet structure 3, the air outlet structure 3 is a flat air outlet symmetrically opened on both sides of the clamping part 21 of the needle clamp body 2, which connects to the air inlet structure 4. The air outlet has a flat rectangular structure and connects to the air inlet structure 4 opened inside the clamping part 21. This arrangement makes the airflow blown out of the air outlet more uniform, ensuring the removal effect of static electricity and magnetic powder on the surface of the diaphragm inside the wound cell 1.

[0039] In one or more embodiments, the inlet of the air outlet structure 3 passes through the fixing part 22 at the end away from the supporting part 21.

[0040] See Figure 1 , Figure 3 The air outlet structure 3 can be an airflow channel that penetrates the support part 21 and the fixing part 22, with the inlet of the airflow channel formed at the end of the fixing part 22 away from the support part 21; or, the air outlet structure 3 can be an airflow channel opened in the support part 21 and include a guide hole opened in the fixing part 22 and the support part 21, with one end of the guide hole connected to the middle position of the airflow channel and the other end penetrating the fixing part 22 at the end away from the support part 21. With this arrangement, it can be ensured that the ion air entering the airflow channel can flow evenly towards both sides of the airflow channel, so as to ensure that the ion airflow blown out by the air outlet structure 3 can be more uniform. It should be noted that the guide hole can be replaced by a guide groove or other guide structure that is connected to the middle position of the airflow channel.

[0041] In one or more embodiments, at least the top and bottom sides of the support portion 21 are prismatic or rounded.

[0042] See Figure 1 , Figure 3 The fifth and sixth surfaces of the tensioning portion 21 have periphery sides formed into a prismatic structure. This arrangement reduces damage to the cell surface caused by the tensioning portion 21. In other embodiments, the sides of the first to sixth surfaces of the tensioning portion 21 can be rounded. By configuring each side of the tensioning portion 21 into a smooth rounded structure, the tensioning portion 21 can adapt to the shape of the inner ring separator of the wound cell 1, reducing the damage caused when the tensioning portion 21 opens the inner ring of the wound cell 1 and improving the molding quality of the wound cell 1.

[0043] In one or more embodiments, the clamping part 21 and the fixing part 22 of the clamping needle body 2 are integrally formed.

[0044] See Figure 1 The clamping part 21 and the fixing part 22 of the clamping needle body 2 can be integrally stamped. This arrangement can improve the strength of the clamping needle body 2 and extend its service life.

[0045] In one or more embodiments, the material of the clamping pin body 2 is either PEEK or stainless steel. This arrangement, by configuring the material of the clamping pin body 2 as PEEK or stainless steel, effectively reduces the entry of particles generated by friction between the clamping pin body 2 and the wound battery cell 1 into the wound battery cell 1, ensuring the cleanliness and molding quality of the wound battery cell 1 after molding, and thus possessing practicality.

[0046] In one or more embodiments, the air inlet structure 4 and air outlet structure 3 of the clip body 2 are coated with polytetrafluoroethylene.

[0047] It should be noted that the polytetrafluoroethylene coating has a certain anti-rust effect, which can effectively reduce the possibility of corrosion of the air inlet structure 4 and air outlet structure 3 of the clamp body 2, improve the service life of the clamp body 2, and ensure the forming quality of the wound battery cell 1.

[0048] The present invention also provides a needle clamping mechanism, which includes a first clamping needle 51 and a second clamping needle 52 arranged sequentially along the direction of spreading the inner ring of the winding cell 1, and a first driving device 53 for controlling the first clamping needle 51 and the second clamping needle 52 to move closer to or further away from each other; wherein the first clamping needle 51 and / or the second clamping needle 52 adopts the clamping needle in any of the above embodiments.

[0049] See Figure 6 The fourth surface of the first clamping pin 51 is opposite to the first surface of the second clamping pin 52. The first surface of the first clamping pin 51 and the fourth surface of the second clamping pin 52 are used to contact and open the inner ring of the wound cell 1. The first driving device 53 can be a bidirectional cylinder, or a bidirectional lead screw and a servo motor that controls the bidirectional lead screw to rotate. It should be noted that the first driving device 53 can also be other possible driving sources, and the specific type is not limited.

[0050] When unloading the wound battery cell 1, the first clamping pin 51 and the second clamping pin 52 are first inserted into the wound battery cell 1. Then, the first driving device 53 controls the first clamping pin 51 and the second clamping pin 52 to move away from each other, so that the first surface of the first clamping pin 51 and the fourth surface of the second clamping pin 52 can respectively press against the inner ring surfaces on both sides of the wound battery cell 1. As the first clamping pin 51 and the second clamping pin 52 move away from each other, the wound battery cell 1 can be opened. It has the characteristics of simple structure and convenient operation, and is practical.

[0051] In one or more embodiments, the needle clamping mechanism further includes a second driving device for connecting to the first driving device 53, the second driving device being used to control the first driving device 53 to reciprocate along the length direction of the wound cell 1.

[0052] It is understandable that the second drive device can be a combination of a servo motor and a lead screw to control the first drive device 53 and the first clamping pin 51 and the second clamping pin 52 to move along the length direction of the wound cell 1, or it can be controlled by a drive cylinder, or it can be driven by a robot. It should be noted that the second drive device is the power source for driving the first drive device 53 to move, and the specific type is not limited. It can be selected according to the actual production needs.

[0053] In addition, this utility model also provides a battery cell winding device, which includes the above-mentioned clamping pins and / or the above-mentioned clamping pin mechanism.

[0054] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

[0055] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A clamping pin for inserting and opening the inner coil of a wound battery cell, characterized in that, The clamping body includes a flat tensioning portion and a fixing portion. The clamping body has an air outlet structure formed at least on the side of the tensioning portion for opening the inner ring of the wound cell, and an air inlet structure communicating with the air outlet structure is formed at least in the tensioning portion.

2. The clamping pin according to claim 1, characterized in that: The air outlet structure is a combination of through holes symmetrically opened on both sides of the clamping part of the needle body, connecting to the air inlet structure.

3. The clamping pin according to claim 1, characterized in that: The air outlet structure is a flat air inlet that is symmetrically opened on both sides of the clamping part of the needle body and connects to the air inlet structure.

4. The clamping pin according to claim 1, characterized in that: The air outlet structure has an inlet that passes through the fixing part at the end away from the supporting part.

5. The clamping pin according to claim 1, characterized in that: At least the top and bottom sides of the support portion are prismatic or rounded.

6. The clamping pin according to claim 1, characterized in that: The clamping part and the fixing part of the clamping needle body are integrally formed.

7. The clamping pin according to claim 1, characterized in that: The air inlet and outlet structures of the clamp body are coated with polytetrafluoroethylene.

8. A needle clamping mechanism, characterized in that, It includes a first clamping pin and a second clamping pin arranged sequentially along the direction of spreading the inner ring of the wound cell, and a first driving device for controlling the first clamping pin and the second clamping pin to move closer to or further away from each other; Wherein, the first clamping needle and / or the second clamping needle are clamping needles as described in any one of claims 1-7.

9. The needle clamping mechanism according to claim 8, characterized in that: The needle clamping mechanism further includes a second driving device for connecting to the first driving device, the second driving device being used to control the first driving device to reciprocate along the length direction of the wound cell.

10. A battery cell winding device, characterized in that, Includes the needle clamping mechanism as described in any one of claims 1-7 and / or the needle clamping mechanism as described in any one of claims 8-9.

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