An inner winding needle and a winding needle assembly

Abstract

The present application discloses an inner rolling needle, which comprises a rolling needle body extending in a first direction and a pressing piece arranged on the rolling needle body and in the first direction. A plurality of elastic pushing pieces are arranged in the rolling needle body in the first direction, and the elastic pushing pieces apply a clamping force to the pressing piece. The present application also discloses a rolling needle assembly realized by using the inner rolling needle. By arranging the elastic pushing pieces, the present application can make the inner rolling needle bear force uniformly, eliminate the gap in the middle part between the inner rolling needles, and better clamp the diaphragm material belt.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery automation equipment, and particularly relates to an inward-winding needle and a winding needle assembly. Background Technology

[0002] The production of battery cells involves sequentially winding positive electrode strips, negative electrode strips, and separator strips to form a wound body. The separator strip separates the positive and negative electrodes to prevent short circuits. Therefore, the needle winding assembly must clamp the separator strip before winding. Because the force on the needle winding assembly is mainly concentrated at both ends when clamping the strip, a gap will remain in the middle. The needle winding assembly cannot clamp the middle of the separator strip, which can easily cause wrinkles in the middle of the separator during winding, affecting the quality of the battery cell. Summary of the Invention

[0003] The purpose of this invention is to provide an inner winding needle and a winding needle assembly capable of uniformly clamping a strip of material.

[0004] To achieve the above objectives, the present invention provides an internally wound needle comprising a wound needle body extending along a first direction, wherein the wound needle body has a pressing member disposed along the first direction, and a plurality of pushing members disposed within the wound needle body along the first direction, wherein the pushing members apply a clamping force to the pressing member.

[0005] In one embodiment of the internal coiled needle of the present invention, the coiled needle body has a long slit opened along the first direction parallel to the top surface of the coiled needle body, and the long slit penetrates the front and rear surfaces of the coiled needle body; the portion of the coiled needle body located on one side of the top surface forms the pressing member.

[0006] In one embodiment of the internal coiled needle of the present invention, a plurality of bending grooves are formed in the middle of the long slit toward the coiled needle body opposite to the pressing member.

[0007] In one embodiment of the internal coiled needle of the present invention, the bottom surface of the coiled needle body is provided with a plurality of through holes along the first direction. The through holes penetrate the coiled needle body and communicate with the long gap, and are used to accommodate the pusher.

[0008] In one embodiment of the in-coil needle of the present invention, the pressing member is a thin sheet structure and is assembled to the top surface of the coil needle body, with a deformation space reserved between it and the top surface.

[0009] In one embodiment of the internal winding needle of the present invention, the winding needle body has a plurality of blind holes along the first direction for accommodating the pusher, one end of the blind hole is disposed in the winding needle body, and the other end is connected to the deformation space.

[0010] In one embodiment of the inward-rolling needle of the present invention, a plurality of clamping grooves are provided on the clamping surface of the pressing member along the first direction.

[0011] The needle coiling assembly of the present invention includes a needle coiling seat, a first intermediate needle and a second intermediate needle disposed on the needle coiling seat, and a first inner needle and a second inner needle respectively disposed on opposite sides of the first and second intermediate needles, and the first and second inner needles are configured to be able to move closer to each other and further apart. A first groove is machined on the side of the first intermediate needle opposite to the second intermediate needle, and the first inner needle is movably disposed in the first groove; the first inner needle includes a needle coiling body extending along a first direction, the needle coiling body having a pressing member disposed along the first direction, and a plurality of pushing members disposed within the needle coiling body along the first direction, the pushing members applying a clamping force to the pressing member.

[0012] In one embodiment of the needle coiling assembly of the present invention, steps are machined at both ends of the first inner coiling needle; a pair of T-shaped threaded grooves are machined at both ends of the first groove, and a pressure plate and a T-bolt are provided in the T-shaped threaded grooves. The pressure plate is in contact with the step surface, and the T-bolt and the pressure plate movably restrict the first inner coiling needle within the first groove.

[0013] In one embodiment of the needle coiling assembly of the present invention, the first inner coiling needle is machined with a long slit along the first direction to form the pusher; the first inner coiling needle is machined with a plurality of through holes on the side near the first groove, and the plurality of pushers abut against the inner surface of the pressing member through the through holes.

[0014] In summary, the needle winding assembly of the present invention, by processing a long gap on the first inner winding needle, and having multiple elastic elements disposed between the first inner winding needle and the first middle winding needle directly abut against the inner surface of the long gap, makes the first inner winding needle bear force evenly and eliminates the gap between the middle of the first inner winding needle and the second inner winding needle. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the inward-rolling needle structure of the present invention;

[0016] Figure 2 yes Figure 1 A structural diagram of the inward-curling needle from another perspective;

[0017] Figure 3 This is a cross-sectional view of the needle coiling assembly of the present invention;

[0018] Figure 4 yes Figure 3 A magnified view of the coil needle assembly. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0020] Please see Figure 1 , Figure 2 The internal coil needle 100 of the present invention includes a coil needle body 110 that is generally long rod-shaped. The coil needle body 110 includes a first end 111 and a second end 112 that are arranged opposite each other in the length direction, a bottom surface 113 and a top surface 114 that are arranged opposite each other in the thickness direction, and a front surface 115 and a rear surface 116 formed between the first / second end and the bottom / top surface.

[0021] The top surface 114 is a clamping surface used to cooperate with another inward-winding needle to clamp the diaphragm strip. Multiple clamping grooves 1141 are provided on this surface along the length direction. The clamping grooves 1141 can match the corresponding structures on the other cooperating inward-winding needle, thereby increasing the contact area between the clamping surface and the diaphragm strip to clamp the diaphragm strip more securely. The clamping grooves 1141 are arranged along the length direction to facilitate the inward-winding needle 100 to exit from the wound cell and reduce interference with the diaphragm strip during the exit process.

[0022] The needle coil body 110 has a long slit 120 along its length near the top surface 114. The long slit 120 penetrates the front surface 115 and the rear surface 116, thereby forming a thinner pressing sheet 130 in the direction near the top surface 114 of the needle coil body 110. Multiple through holes 1131 are formed along the length of the bottom surface 113 of the needle coil body 110, extending from the bottom surface 113 to the long slit 120. Pushing elements (e.g., compression springs) can be installed in the through holes 1131, which can apply an outward pushing force to the pressing sheet 130, thereby enhancing the clamping force of the inner needle coil 100 on the diaphragm strip.

[0023] The long slit 120 has a plurality of bends 121 evenly formed along its length. The bends 121 are formed by bending grooves opened toward one side of the needle coil body 110, and their number can be determined according to the length of the needle coil body 110 / long slit 120. The bends 121 restrict the needle coil body 110 and the pressing plate 130 of the inner needle coil 100 within a certain relative range of motion (i.e., the groove width between the bends 121 and the needle coil body 110), so as to prevent the pressing plate 130 from being subjected to multiple pushing members and causing irreversible deformation due to the excessive length of the long slit 120.

[0024] In other embodiments of the invention, the through hole 1131 can also be implemented as a blind hole. In this embodiment, one end of the blind hole is disposed within the needle coil body 110, and the other end is open and communicates with the elongated slit 120, so that one end of the pusher is disposed at the bottom of the blind hole, and the other end extends from the opening of the hole and applies force to the pressing piece 130. To facilitate the processing of the blind hole and the assembly of the pusher, the pressing piece 130 can be implemented as a separate thin metal sheet and assembled or welded to the needle coil body 110. After assembly, a deformation space is reserved between the pressing piece and the needle coil body 110 so that it can deform and recover under the action of the pusher.

[0025] In addition, the first end 111 and the second end 112 of the inward-curling needle 100 each have a relatively thin step 119. The step 119 can be provided with structures such as mounting holes to facilitate the installation of the inward-curling needle 110 of the present invention into a needle winding assembly. Figure 3 , Figure 4 A needle winding assembly 200 employing the inner needle winding 100 of this embodiment is disclosed.

[0026] As shown in the figure, the needle winding assembly 200 includes a needle winding base 210, a first intermediate needle 220 and a second intermediate needle 230 fixedly installed in the needle winding base 210. The two intermediate needles are parallel and spaced apart. The opposing surfaces of the first intermediate needle 220 and the second intermediate needle 230 are respectively machined with a first groove 221 and a second groove 231. A first inner needle 240 is movably disposed in the first groove 221, and a second inner needle 250 is movably disposed in the second groove 231. A gap is formed between the first inner needle 240 and the second inner needle 250 for the diaphragm material to pass through.

[0027] The second inward-curling needle 250 is mounted on a sliding block 211 inside the needle holder 210. The sliding block 211 can be driven to move the second inward-curling needle 250 toward the first inward-curling needle 240 to clamp the diaphragm strip. The outer side of the second inward-curling needle 250 is connected to the second intermediate needle 230 through multiple pins and elastic elements (such as compression springs). Thus, when the second inward-curling needle 250 moves toward the first inward-curling needle 240, the pins can play a guiding role, and the elastic elements can make the movement smooth.

[0028] The outer side of the second intermediate winding needle 230 is connected to the second outer winding needle 270 by multiple pins. A washer 290 can also be provided between the second intermediate winding needle 230 and the second outer winding needle 270 via pins. By providing washeres of different sizes, the cross-sectional perimeter of the winding needle assembly of the present invention can be changed to wind battery cells of different specifications. Correspondingly, the first intermediate winding needle 220 is also provided with a first outer winding needle 260 and a washer 280.

[0029] In this embodiment, the first inward-curling needle 240 adopts the inward-curling needle 100 of the aforementioned embodiment, and the second inward-curling needle 250 adopts a conventionally designed coiling needle. In this design, one of the inward-curling needles provides elastic clamping force sufficient to meet some winding requirements; however, the second inward-curling needle 250 can also adopt the structure of the inward-curling needle 100 without hindrance and achieve a better diaphragm clamping effect.

[0030] like Figure 4As shown, a pair of T-shaped threaded grooves 222 are machined on the first winding needle 220. The T-shaped threaded grooves 222 are located at both ends along the length of the first groove 221, and the line connecting them is parallel to the axial direction of the winding needle assembly. Both T-shaped threaded grooves 222 communicate with the first groove 221, so that the pressure plate 223 and T-bolt 224 provided in the T-shaped threaded grooves 222 can press against the step 249 of the first inner winding needle 240, thereby restricting the first inner winding needle 240 within a predetermined range of motion. A plurality of springs 241 are provided in the through hole of the first inner winding needle 240. One end of the spring 241 abuts against the bottom surface of the groove 221, and the other end abuts against the pressing plate 242 of the first inner winding needle 240, providing a clamping force for the middle part of the inner winding needle to clamp the diaphragm strip.

[0031] In summary, this invention, by processing long gaps on the inner winding needles and using multiple elastic elements to act on the inner surface of the long gaps, ensures uniform force when the two inner winding needles clamp the material strip, resulting in better battery cell winding effect.

[0032] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An inward-curling needle, characterized in that, The device includes a coiled needle body extending along a first direction, the coiled needle body having a pressing member disposed along the first direction, and a plurality of pushing members disposed within the coiled needle body along the first direction, the pushing members applying a clamping force to the pressing member. The needle coil body has a long slit opened along the first direction parallel to the top surface of the needle coil body, and the long slit penetrates the front and rear surfaces of the needle coil body; the portion of the needle coil body located on one side of the top surface forms the pressing member; the pressing member is a pressing sheet; The bottom surface of the coiled needle body is provided with a plurality of through holes along the first direction. The through holes penetrate the coiled needle body and communicate with the long gap, and are used to accommodate the pusher. Several bending grooves are formed in the middle of the long slit towards the side of the coiled needle body opposite to the pressing member.

2. The inward-curling needle as described in claim 1, characterized in that, The pressing component is a thin sheet structure and is assembled onto the top surface of the coiled needle body, with a deformation space reserved between it and the top surface.

3. The inward-rolling needle as described in claim 2, characterized in that, The needle coil body has several blind holes along the first direction to accommodate the pusher. One end of each blind hole is located inside the needle coil body, and the other end is connected to the deformation space.

4. The inward-rolling needle as described in claim 1, characterized in that, The clamping surface of the pressing member is provided with a plurality of clamping grooves along the first direction.

5. A needle coiling assembly, comprising a needle coiling seat, a first intermediate needle and a second intermediate needle disposed on the needle coiling seat, wherein a first inner needle and a second inner needle are respectively disposed on opposite sides of the first and second intermediate needles, and the first and second inner needles are configured to be able to move closer to each other and further apart; characterized in that, The first inner coil needle has a first groove on the side opposite to the second inner coil needle, and the first inner coil needle is movably disposed in the first groove; the first inner coil needle includes a coil needle body extending along a first direction, the coil needle body has a pressing member disposed along the first direction, and a plurality of pushing members are disposed in the coil needle body along the first direction, the pushing members applying a clamping force to the pressing member. The needle coil body has a long slit opened along the first direction parallel to the top surface of the needle coil body, and the long slit penetrates the front and rear surfaces of the needle coil body; the portion of the needle coil body located on one side of the top surface forms the pressing member; the pressing member is a pressing sheet; The bottom surface of the coiled needle body is provided with a plurality of through holes along the first direction. The through holes penetrate the coiled needle body and communicate with the long gap, and are used to accommodate the pusher. Several bending grooves are formed in the middle of the long slit towards the side of the coiled needle body opposite to the pressing member.

6. The needle coiling assembly as claimed in claim 5, characterized in that, Both ends of the first inward-curling needle are machined with steps; both ends of the first groove are machined with a pair of T-shaped threaded grooves, and pressure plates and T-bolts are provided in the T-shaped threaded grooves. The pressure plates are in contact with the stepped surface, and the T-bolts and pressure plates restrict the first inward-curling needle to move within the first groove.

7. The needle coiling assembly as claimed in claim 6, characterized in that, The first inward-curving needle is machined with a long slit along the first direction to form the pressing member; the first inward-curving needle is machined with several through holes on the side near the first groove, and the several pushing members abut against the inner surface of the pressing member through the through holes.

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