Battery cell winding mechanism

Abstract

The application discloses a kind of electric core winding mechanism, wherein electric core winding mechanism includes mounting seat, winding needle component and clamping assembly.Activity component is provided in mounting seat;Winding needle component includes movable winding needle and fixed winding needle, the movable winding needle is equipped in the activity component, the fixed winding needle is fixedly equipped in the mounting seat, the movable winding needle and the fixed winding needle are all extended to the same side of the mounting seat, and gap is formed between the movable winding needle and the fixed winding needle;Clamping assembly is equipped in the gap, and the clamping assembly includes movable inner clamp and fixed inner clamp, the movable inner clamp is equipped in the side close to the movable winding needle, and the movable inner clamp is connected with the activity component, and the fixed inner clamp is equipped in the side of the fixed winding needle.The technical scheme of the application can improve the efficiency of winding.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a cell winding mechanism. Background Technology

[0002] The production of lithium battery cells is achieved through winding by a winding mechanism. First, the separator is fixed, and then the separator is wound by a winding needle to form the lithium battery cell.

[0003] Many existing winding mechanisms use olive-shaped or elliptical shapes, which limit their winding speed and require sophisticated control programs, hindering production process control. While columnar winding mechanisms are easier to manufacture, they also suffer from low winding efficiency and unstable winding of the diaphragm by the winding needles, ultimately leading to low product yield and impacting production schedules. Summary of the Invention

[0004] The main objective of this invention is to provide a battery cell winding mechanism that aims to improve winding efficiency.

[0005] To achieve the above objectives, the present invention proposes a battery cell winding mechanism, comprising: a mounting base, a winding needle assembly, and a clamping assembly. The mounting base has a movable component; the winding needle assembly includes a movable winding needle and a fixed winding needle, the movable winding needle being disposed on the movable component, and the fixed winding needle being fixedly disposed on the mounting base. Both the movable and fixed winding needles extend towards the same side of the mounting base, and a gap is formed between the movable and fixed winding needles; the clamping assembly is disposed in the gap, and the clamping assembly includes a movable inner clamp and a fixed inner clamp. The movable inner clamp is disposed near the movable winding needle and connected to the movable component, while the fixed inner clamp is disposed on one side of the fixed winding needle. The movable inner clamp is movable relative to the fixed inner clamp to clamp or release the diaphragm, and the movable winding needle is movable relative to the fixed winding needle. Through the winding needle assembly, the diaphragm is tightly adhered to the outer surface of the winding needle assembly to wind the diaphragm to form a battery cell.

[0006] Optionally, the needle coil assembly is cylindrical in shape.

[0007] Optionally, the movable component includes a first component and a second component. The first component is elastically connected to the mounting base and the movable coiling needle, and the second component is elastically connected to the mounting base and the movable inner clamp. Both the first component and the second component can move freely along the clamping direction of the clamping component.

[0008] Optionally, the first component includes a first movable block and elastic members disposed on opposite sides of the first movable block and connected to the mounting base, and the first movable block is fixedly connected to the movable coiling needle; the second component includes a second movable block and elastic members disposed on opposite sides of the second movable block and elastically connected to the mounting base, and the second movable block is fixedly connected to the movable inner clamp.

[0009] Optionally, the clamping direction of the clamping assembly is the height direction, and the first movable block and the second movable block are offset in the height direction and do not interfere with each other.

[0010] Optionally, the movable component further includes a push pin. The first movable block has a first abutment portion on one side, and the second movable block has a second abutment portion on one side. The push pin is movably disposed between the first abutment portion and the second abutment portion. When the push pin abuts against the first abutment portion and the second abutment portion, the first movable portion moves upward in the height direction, causing the movable winding pin to move upward in the height direction, cooperating with the fixed winding pin to tension the diaphragm. The second movable portion moves downward in the height direction, causing the movable inner clamp to move downward in the height direction, cooperating with the fixed inner clamp to clamp the diaphragm.

[0011] Optionally, the movable inner clamp has a clamping protrusion on the side facing the fixed inner clamp, and the fixed inner clamp has a clamping groove on the side facing the movable inner clamp. The clamping protrusion and the clamping groove can abut against each other to clamp the diaphragm.

[0012] Optionally, the free ends of the needle winding assembly and the clamping assembly are both provided with flanges protruding outwards; the cell winding mechanism also includes a fixing sleeve, which is fitted onto the flange when the cell winding mechanism clamps the diaphragm.

[0013] Optionally, the flange of the needle coiling assembly is a first protrusion, the flange of the clamping assembly is a second protrusion, and the fixing sleeve has a first groove and a second groove; when the fixing sleeve is fitted onto the flange, the first protrusion is correspondingly embedded in the first groove, and the second protrusion is correspondingly embedded in the second groove.

[0014] Optionally, the outer wall surface of the needle winding assembly is provided with a core-pulling groove, which extends along the length direction of the needle winding assembly and has an opening at one end of the needle winding assembly, through which the battery cell can be fed.

[0015] This invention employs a combination of movable and fixed inner clamps at the gap in the clamping assembly to clamp the diaphragm, and a combination of movable and fixed winding needles to wind the diaphragm. It should be noted that while the movable inner clamp moves towards the fixed inner clamp to clamp the diaphragm, the movable winding needle moves away from the fixed winding needle to tension the diaphragm, ensuring it adheres tightly to the outer surface of the winding needle assembly. This close contact facilitates winding, improving winding efficiency and ensuring a high yield rate of the wound cells. After winding, the movable inner clamp and movable winding needle return to their original positions. As the clamping force and tension disappear, the cell can easily detach from the winding needle assembly. Thus, through the coordinated movement of the movable inner clamp and movable winding needle, the process of clamping, winding, and detaching the diaphragm is achieved. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a structure of an embodiment of the battery cell winding mechanism of the present invention;

[0018] Figure 2 This is a schematic diagram of the winding needle assembly and clamping assembly of the battery cell winding mechanism of the present invention.

[0019] Figure 3 This is a schematic diagram of the movable winding needle, movable inner clamp, and movable component structure of the battery cell winding mechanism of the present invention.

[0020] Figure 4 This is a schematic diagram of the winding needle assembly of the battery cell winding mechanism of the present invention;

[0021] Figure 5 This is a schematic diagram of the overall appearance of an embodiment of the battery cell winding mechanism of the present invention;

[0022] Figure 6 for Figure 5 Sectional view at point A in the middle;

[0023] Figure 7 This is a schematic diagram of the structure of a mounting base for the battery cell winding mechanism of the present invention;

[0024] Figure 8 for Figure 7 Sectional view at point B.

[0025] Explanation of icon numbers:

[0026]

[0027]

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] This invention proposes a battery cell winding mechanism.

[0034] Reference Figures 1 to 8 In one embodiment of the present invention, the battery cell winding mechanism includes: a mounting base 1, a winding needle assembly 3, and a clamping assembly 4. The mounting base 1 is provided with a movable assembly 2; the winding needle assembly 3 includes a movable winding needle 31 and a fixed winding needle 32, the movable winding needle 31 being disposed on the movable assembly 2, and the fixed winding needle 32 being fixedly disposed on the mounting base 1. Both the movable winding needle 31 and the fixed winding needle 32 extend towards the same side of the mounting base 1, and a gap is formed between the movable winding needle 31 and the fixed winding needle 32; the clamping assembly 4 is disposed in the gap, and the clamping assembly 4 includes a movable inner clamp 41 and a fixed inner clamp 42. The movable inner clamp 41 is located on the side near the movable winding needle 31 and is connected to the movable assembly 2. The fixed inner clamp 42 is located on the side of the fixed winding needle 32. The movable inner clamp 41 can move relative to the fixed inner clamp 42 to clamp or loosen the diaphragm. The movable winding needle 31 can move relative to the fixed winding needle 32 and, through the winding needle assembly 3, make the diaphragm fit tightly against the outer surface of the winding needle assembly 3 to wind the diaphragm to form a battery cell.

[0035] The technical solution of this invention employs the cooperation of a movable inner clip 41 and a fixed inner clip 42, with reference to... Figures 2 to 4 The diaphragm is clamped at the gap provided in the clamping assembly 4. The diaphragm is wound using the cooperation of a movable winding needle 31 and a fixed winding needle 32. It should be noted that while the movable inner clamp 41 moves towards the fixed inner clamp 42 to clamp the diaphragm, the movable winding needle 31 moves away from the fixed winding needle 32 to tension the diaphragm. This ensures the diaphragm adheres tightly to the outer surface of the winding needle assembly 3. This close contact facilitates winding, improving winding efficiency and ensuring a high yield rate for the wound cells. After winding, the movable inner clamp 41 and movable winding needle 31 reset. As the clamping force and tension disappear, the cell can easily detach from the winding needle assembly 3. Thus, the coordinated movement of the movable inner clamp 41 and movable winding needle 31 enables the entire process of clamping, winding, and detaching the diaphragm.

[0036] To reduce the winding difficulty of the needle winding assembly 3, the needle winding assembly 3 is cylindrical in shape. The cylindrical shape of the needle winding assembly 3 can avoid the difficulty of program design caused by irregular shape. The cylindrical shape of the needle winding assembly 3 has a relatively simple shape, so there is not much need for winding speed, which makes the program lightweight and simple.

[0037] refer to Figure 1 and Figure 2To reduce costs and make the needle winding assembly 3 lightweight, the needle winding assembly 3 is hollowed out and has multiple weight-reducing grooves inside, which reduces the overall weight of the needle winding assembly 3, resulting in relatively small torque generated during rotation. Furthermore, the needle winding assembly 3 also has mounting grooves 35 extending along its length. A movable inner clamp 41 is installed in the mounting groove 35 of the movable needle winding 31, and a fixed inner clamp 42 is installed in the mounting groove 35 of the fixed needle winding 32.

[0038] Specifically, the movable component 2 includes a first component 21 and a second component 22. The first component 21 elastically connects the mounting base 1 and the movable coiling needle 31, and the second component 22 elastically connects the mounting base 1 and the movable inner clamp 41. Both the first component 21 and the second component 22 can move freely along the clamping direction of the clamping component 4. Further, the first component 21 includes a first movable block 211 and elastic members 23 disposed on opposite sides of the first movable block 211 and connected to the mounting base 1, and the first movable block 211 is fixedly connected to the movable coiling needle 31. The second component 22 includes a second movable block 221 and elastic members 23 disposed on opposite sides of the second movable block 221 and elastically connected to the mounting base 1, and the second movable block 221 is fixedly connected to the movable inner clamp 41. Under the elastic force of the elastic members 23, the first movable block 211 and the second movable block 221 can reciprocate within the mounting base 1, thereby driving the movable coiling needle 31 of the coiling needle assembly 3 and the movable inner clamp 41 of the clamping component 4 to move back and forth. This satisfies the two main functions of the movable winding needle 31: tensioning the winding diaphragm and loosening the detachment from the battery cell, as well as the two main actions of the movable inner clamp 41: clamping the diaphragm and loosening the diaphragm.

[0039] Specifically, in one embodiment, the clamping direction of the clamping assembly 4 is the height direction. The first movable block 211 and the second movable block 221 are offset in the height direction and do not interfere with each other. This ensures that the first movable block 211 can move freely along the height direction without interfering with the movement of the second movable block 221 along the height direction. In another embodiment, the clamping direction of the clamping assembly 4 can also be the horizontal direction, the inclined direction, etc.

[0040] Furthermore, to achieve the specific movement of the first movable block 211 and the second movable block 221, the movable component 2 also includes a push pin 5. The first movable block 211 has a first abutting portion 212 on one side, and the second movable block 221 has a second abutting portion 222 on one side. The push pin 5 is movably disposed between the first abutting portion 212 and the second abutting portion 222. The specific movement of the first movable block 211 and the second movable block 221 is achieved through the cooperation of the first abutting portion 212 and the second abutting portion 222 with the push pin 5.

[0041] Specifically, when the ejector pin 5 abuts against the first abutting part 212 and the second abutting part 222, the first movable part moves upward along the height direction, causing the movable winding pin 31 to move upward along the height direction, cooperating with the fixed winding pin 32 to tighten the diaphragm; the second movable part moves downward along the height direction, causing the movable inner clamp 41 to move downward along the height direction, cooperating with the fixed inner clamp 42 to clamp the diaphragm.

[0042] In this embodiment, reference is made to Figure 2 and Figure 3 The first abutment portion 212 and the second abutment portion 222 are configured as pulleys. When the ejector pin 5 contacts the pulleys, the first abutment portion 212 and the second abutment portion 222 move in opposite directions under the abutting action of the ejector pin 5, thereby enabling the first movable block 211 and the second movable block 221 to achieve a predetermined movement. However, this design is not limited to this. In other embodiments, the first abutment portion 212 and the second abutment portion 222 may have inclined surfaces. Through the action of the inclined surfaces, the force of the ejector pin 5 is converted into the displacement of the first movable block 211 and the second movable block 221.

[0043] Further, refer to Figure 4 The movable inner clamp 41 has a clamping protrusion 411 on the side facing the fixed inner clamp 42, and the fixed inner clamp 42 has a clamping groove 421 on the side facing the movable inner clamp 41. The clamping protrusion 411 and the clamping groove 421 can abut against each other to clamp the diaphragm. However, this design is not limited to this. In other embodiments, the clamping protrusion 411 can be provided on the movable inner clamp 41, and the clamping groove 421 can be provided on the fixed inner clamp 42; or, the clamping protrusion 411 and the clamping groove 421 are provided on both the movable inner clamp 41 and the fixed inner clamp 42, and are arranged sequentially, that is, a clamping protrusion 411 is provided between two adjacent clamping grooves 421. Specifically, the clamping protrusion 411 and the clamping groove 421 cooperate with each other. By having the clamping protrusion 411 abut against the diaphragm and cooperate to clamp it in the clamping groove 421, the movable inner clamp 41 and the fixed inner clamp 42 can have better clamping ability, while also solving the problem of diaphragm slippage.

[0044] It should be noted that, in order to improve the winding capability of the cell winding mechanism, both the free ends of the winding needle assembly 3 and the clamping assembly 4 are provided with outwardly protruding flanges; the cell winding mechanism also includes a fixing sleeve 6, which is fitted onto the flanges when the cell winding mechanism clamps the diaphragm. In this way, the relative positions of the winding needle assembly 3 and the clamping assembly 4 are fixed by the fixing sleeve 6, so that during the winding process, the clamping assembly 4 can maintain its clamping capability on the diaphragm, while the winding needle assembly 3 can ensure smooth winding while clamping the diaphragm.

[0045] Furthermore, to achieve the fixing function of the fixing sleeve 6, the flange of the needle coiling assembly 3 is a first protrusion 33, the flange of the clamping assembly 4 is a second protrusion 43, and the fixing sleeve 6 has a first groove and a second groove. When the fixing sleeve 6 is fitted onto the flange, the first protrusion 33 is correspondingly embedded in the first groove, and the second protrusion 43 is correspondingly embedded in the second groove. However, this design is not limited to this. In other embodiments, the fixing sleeve 6 may have a flange, and the edges of the clamping assembly 4 and the needle coiling assembly 3 may have grooves. The flange and the groove cooperate to achieve the cooperation and fixing of the clamping assembly 4 and the needle coiling assembly 3.

[0046] In one embodiment, the outer wall surface of the needle winding assembly 3 is provided with a core-pulling groove 34. The core-pulling groove 34 extends along the length direction of the needle winding assembly 3 and has an opening at one end of the needle winding assembly 3. The battery cell can be unloaded through the core-pulling groove 34. It should be noted that in this embodiment, the core-pulling action can be automated with the help of a robotic arm or manually with the help of a tooling. The core-pulling groove 34 can satisfy the above-mentioned core-pulling action. The battery cell is moved along the length direction of the needle winding assembly 3 for core-pulling, and finally pulled out at the opening, thereby realizing the unloading of the battery cell.

[0047] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An electrode core winding mechanism for winding a separator to form an electrode core, characterized by, The electric core winding mechanism comprises: a mounting base provided with a movable assembly; a winding needle assembly comprising a movable winding needle and a fixed winding needle, the movable winding needle is arranged on the movable assembly, the fixed winding needle is fixedly arranged on the mounting base, the movable winding needle and the fixed winding needle both extend towards the same side of the mounting base, and a gap is formed between the movable winding needle and the fixed winding needle; a clamping assembly arranged in the gap, the clamping assembly comprises a movable inner clamp and a fixed inner clamp, the movable inner clamp is arranged on the side close to the movable winding needle, and the movable inner clamp is connected with the movable assembly, the fixed inner clamp is arranged on the side of the fixed winding needle; the movable inner clamp can move relative to the fixed inner clamp to clamp or release the diaphragm, the movable winding needle can move relative to the fixed winding needle, and the diaphragm is tightly attached to the outer surface of the winding needle assembly through the winding needle assembly to wind the diaphragm to form an electric core; the winding needle assembly is in the shape of a cylinder as a whole; the winding needle assembly is hollow, and a plurality of lightening grooves are arranged in the interior of the winding needle assembly; the movable assembly comprises a first assembly and a second assembly, the first assembly elastically connects the mounting base and the movable winding needle, the second assembly elastically connects the mounting base and the movable inner clamp, and the first assembly and the second assembly are both freely movable along the clamping direction of the clamping assembly; the first assembly comprises a first movable block and elastic members arranged on the opposite sides of the first movable block and connected with the mounting base, and the first movable block is fixedly connected with the movable winding needle; the second assembly comprises a second movable block and elastic members arranged on the opposite sides of the second movable block and elastically connected with the mounting base, and the second movable block is fixedly connected with the movable inner clamp; the clamping direction of the clamping assembly is the height direction, the first movable block and the second movable block are arranged in a staggered manner in the height direction and do not interfere with each other; the movable assembly further comprises a thimble, the first movable block is provided with a first abutting portion on one side, the second movable block is provided with a second abutting portion on one side, and the thimble is movably arranged between the first abutting portion and the second abutting portion; when the thimble abuts against the first abutting portion and the second abutting portion, the first movable block moves upward along the height direction, the movable winding needle moves upward along the height direction, and the diaphragm is tensioned in cooperation with the fixed winding needle; the second movable block moves downward along the height direction, the movable inner clamp moves downward along the height direction, and the diaphragm is clamped in cooperation with the fixed inner clamp.

2. The cell winding mechanism of claim 1, wherein, the side of the movable inner clamp facing the fixed inner clamp is provided with a clamping protrusion, the side of the fixed inner clamp facing the movable inner clamp is provided with a clamping groove, and the clamping protrusion and the clamping groove can abut against each other to clamp the diaphragm.

3. The cell winding mechanism of claim 1, wherein, the free ends of the winding needle assembly and the clamping assembly are both outwardly provided with flanges; the electric core winding mechanism further comprises a fixed sleeve, when the electric core winding mechanism clamps the diaphragm, the fixed sleeve is sleeved with the flanges.

4. The cell winding mechanism of claim 3, wherein, The flange of the winding needle assembly is a first protrusion, the flange of the clamping assembly is a second protrusion, and the fixing sleeve is provided with a first groove and a second groove; When the fixing sleeve is sleeved with the flange, the first protrusion is correspondingly embedded in the first groove, and the second protrusion is correspondingly embedded in the second groove.

5. The cell winding mechanism of claim 1, wherein, An outer wall surface of the winding needle assembly is provided with a core-pulling groove, the core-pulling groove extends along the length direction of the winding needle assembly, and an opening is formed at one end of the winding needle assembly, and the electric core can be discharged through the core-pulling groove.

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