Battery cell winding mechanism and device

Abstract

The utility model discloses a kind of electric core winding mechanism and device. Electric core winding mechanism is used to be wound into electric core by first polar piece, second polar piece, first diaphragm, second diaphragm, including winding needle assembly and folding diaphragm piece. Winding needle assembly is set to rotate along a winding direction to wind a electric core, including the first winding needle and second winding needle parallelly arranged along first direction, and the first winding needle and second winding needle have gap for the first diaphragm and second diaphragm pass through. Folding diaphragm piece includes auxiliary needle along the first direction setting and a driving part for driving the auxiliary needle rotates preset angle along the winding direction. The utility model can form the polar piece head portion of multilayer diaphragm coating in electric core interior, to improve the security of electric core.

Description

Technical Field

[0001] This utility model relates to the technical field of battery manufacturing equipment, and in particular to a battery cell winding mechanism and device for preparing wound battery cells. Background Technology

[0002] A wound battery cell is a structure formed by stacking and winding the positive electrode, separator, and negative electrode using a winding needle. During the cell manufacturing process, both the positive and negative electrode sheets are pre-cut to a predetermined length before being wound. To prevent burrs generated at the cut points from penetrating the separator and causing a short circuit inside the battery, adhesive tape is usually applied to the cut points of the electrode sheets to isolate the burrs.

[0003] However, dust is generated during electrode cutting. When this dust adheres to the electrode surface, it can affect the adhesion of the tape, making it prone to loosening or falling off. This can still negatively impact the safety of the battery cell.

[0004] In addition, using tape to attach the electrode sheets will inevitably affect the cell capacity to some extent, which will also affect the cell performance. Utility Model Content

[0005] In view of this, this application provides a battery cell winding mechanism and apparatus that can improve the safety of the manufactured battery cells.

[0006] The battery cell winding mechanism provided in this application embodiment is used to wind a first electrode, a second electrode, a first separator, and a second separator into a battery cell. The battery cell winding mechanism includes a winding needle assembly and a separator folding member. The winding needle assembly is configured to rotate along a winding direction to wind a battery cell. The winding needle assembly includes a first winding needle and a second winding needle arranged parallel to each other along a first direction, with a gap between the first winding needle and the second winding needle for the first separator and the second separator to pass through. The separator folding member includes an auxiliary needle arranged along the first direction and a driving member that drives the auxiliary needle to rotate along the winding direction by a preset angle.

[0007] In some embodiments, the diaphragm member includes an elongated housing, the first end of which is connected to a driving device, and the second end of which is fitted with the auxiliary needle.

[0008] In this embodiment, the auxiliary needle has an air passage inside and several air holes on the auxiliary needle. The air passage and air holes can generate an adsorption force on the auxiliary needle to hold the first diaphragm and the second diaphragm.

[0009] In this embodiment, the auxiliary needle is connected to a vacuum source via a spiral tube, and the spiral tube is fitted onto the housing.

[0010] In some embodiments, the auxiliary needle includes a clamping bar that is driven to approach and separate, the clamping bar being used to clamp the first diaphragm and the second diaphragm from both sides.

[0011] In some embodiments, a needle tip sleeve is provided inside the housing, the needle tip sleeve extends from the second end of the housing, and a needle insertion hole is formed at the front end of the needle tip sleeve to accommodate the free end of the coiling needle assembly.

[0012] In this embodiment, the two ends of the needle sleeve are respectively fitted into a first bearing and a second bearing, and the first bearing and the second bearing are disposed inside the sleeve housing.

[0013] In this embodiment, a positioning ring is provided on the housing; a sensor is provided on one side of the positioning ring, and the sensor detects the angle through which the positioning ring rotates to determine the rotation angle of the auxiliary needle.

[0014] In another embodiment, the cell winding device is used to wind a first electrode, a second electrode, a first diaphragm, and a second diaphragm into a cell, and includes a turret mechanism and a diaphragm folding mechanism. The turret mechanism includes a winding station, a finishing station, and a unloading station arranged along the circumferential direction, and each station is provided with a winding needle assembly. The diaphragm folding mechanism includes a mounting base and three sets of diaphragm folding components arranged on the mounting base. Each diaphragm folding component is arranged opposite to a winding needle assembly, and each diaphragm folding component includes an auxiliary needle arranged parallel to the winding needle assembly and a driving member that drives the auxiliary needle to move along the rotation direction of the winding needle assembly.

[0015] In another embodiment, the cell winding device is provided with a diaphragm device between the winding station and the finishing station for cutting the first diaphragm and the second diaphragm.

[0016] In summary, the battery cell winding mechanism and apparatus of this application can form at least three layers of diaphragms in the inner ring of the head of a selected electrode by folding the free ends of the first and second diaphragms along the battery cell winding direction, thereby effectively preventing the diaphragms from being punctured and enhancing the safety of the battery cell. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figures 1(A) to 1(D) are schematic diagrams of the working process of the battery cell winding mechanism of this application;

[0019] Figure 2 This is a structural diagram of an embodiment of the battery cell winding mechanism of this application;

[0020] Figure 3 yes Figure 2 Structural diagram of the folded diaphragm component;

[0021] Figure 4 yes Figure 3 Cross-sectional view of the folded diaphragm component;

[0022] Figure 5 This is a schematic diagram of an embodiment of the battery cell winding device of this application;

[0023] Figure 6 This is a structural diagram of an embodiment of the battery cell winding device of this application;

[0024] Figure 7 yes Figure 6 Another structural diagram of the cell winding device from a different angle; Detailed Implementation

[0025] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] As shown in Figures 1(A) to 1(C), the battery cell winding mechanism of this utility model is used to wind a strip formed by stacking a first diaphragm S1, a second diaphragm S2, a first electrode P1, and a second electrode P2 into a battery cell. In this embodiment, the battery cell winding mechanism includes a winding needle assembly 100 and a diaphragm folding member 200.

[0027] The needle winding assembly 100 includes a first needle winding 110 and a second needle winding 120 arranged in parallel. The first needle winding 110 and the second needle winding 120 extend from the center of a base 130 and can be driven to rotate within the base 130 to wind the strip into a battery cell. They are also configured to retract from the base 130 to disengage the wound battery cell from the needle winding assembly 100.

[0028] The diaphragm folding member 200 is disposed near the winding needle assembly 100 and is used to fold the free ends S12 of the diaphragms formed by the portions of the first diaphragm S1 and the second diaphragm S2 passing through the winding needle assembly 100 along the rotation direction of the winding needle assembly 100 when winding the battery cell. This results in three layers of diaphragms on the inner ring of the head of the first electrode P1, and the head of the second electrode P2 is also covered by multiple layers of diaphragms from both sides. Because multiple layers of diaphragms are provided between the heads of the first electrode P1 and the second electrode P2, the risk of burrs on the electrode heads penetrating the single layer of the first diaphragm S1 or the second diaphragm S2 can be reduced.

[0029] The following describes the process of the battery cell winding mechanism in this embodiment in conjunction with Figures 1(A) to 1(C).

[0030] As shown in Figure 1(A), during the preparation stage, the first diaphragm S1 and the second diaphragm S2 are guided from the over-roller or the unwinding roller to the top of the needle winding assembly 100, and stacked to form a diaphragm strip, which then passes downward through the gap between the first needle winding 110 and the second needle winding 120. The two diaphragms S1 and S2, stacked together and passing through the first needle winding 110 and the second needle winding 120, form the aforementioned diaphragm free end S12. The head of the diaphragm free end S12 is fixed by the diaphragm folding member 200.

[0031] Please refer to Figure 1(B). The diaphragm folding member 200 is driven to move the free end S12 of the diaphragm along the winding direction of the needle winding assembly 100. Its movement trajectory is shown by the arrow, so that the free end S12 of the diaphragm is attached to the outside of the second diaphragm S2. In this way, the side of the free end S12 of the diaphragm that contacts the needle winding assembly 100 covers the surface of the needle winding assembly 100.

[0032] Subsequently, the insertion operation of the first electrode P1 and the second electrode P2 is performed, that is, the head of the first electrode P1 is inserted between the first diaphragm S1 and the second diaphragm S2, and the head of the second electrode P2 is inserted outside the free end S12 of the diaphragm. After the insertion operation is completed, there are three diaphragms between the head of the first electrode P1 and the head of the second electrode P2: namely, the second diaphragm S2 and the free end S12 of the diaphragm formed by stacking the first diaphragm S1 and the second diaphragm S2, which can prevent the diaphragm between the heads of the first electrode P1 and the second electrode P2 from being punctured.

[0033] Please refer to Figure 1 (C). After the insertion operation of the first electrode P1 and the second electrode P2 is completed, the first winding needle 110 and the second winding needle 120 rotate, and the two electrodes are brought into the space between the two diaphragms by means of the friction between the diaphragm and the electrode, thereby completing the winding of the battery cell.

[0034] In other embodiments, the electrode insertion operation shown in FIG1(B) can also be changed to that shown in FIG1(D), that is, the second electrode P2 is inserted between the second diaphragm S2 and the free end S12 of the diaphragm, while the insertion position of the first electrode P1 remains unchanged. This allows the inner ring of the head of the second electrode P2 to have three layers of diaphragms. These two different insertion designs correspond to different situations where burrs are generated at the electrode head, and can be determined according to specific requirements. The following description still uses the insertion operation shown in FIG1(A) to FIG1(C) as an example.

[0035] Figure 2 , 3 The embodiment shown in Figures 1(A) to 1(C) is a cell winding mechanism that performs the cell winding method shown in Figures 1(A) to 1(C). The winding needle assembly 100, consisting of the first winding needle 110 and the second winding needle 120 arranged side by side, extends forward from the surface of the base 130 and is used to clamp the diaphragms S1 and S2 and the electrode plates P1 and P2 to rotate in order to make the cell C.

[0036] The diaphragm folding component 200 is assembled on one side of the needle winding assembly 100 via a mounting plate 201, and includes a long cylindrical housing 210. The interior of the housing 210 is a hollow mounting space. The first end of the mounting space is fitted onto the drive shaft 221 of a drive motor 220, and the drive shaft 221 is locked to a stepped surface on the inner wall of the mounting space of the housing 210 by a first bolt 222 and a first washer 223, so that the drive motor 220 can drive the housing 210 to rotate.

[0037] A needle sleeve 230 is installed at the second end of the mounting space. The needle sleeve 230 includes a cylindrical main body and a needle tip. The main body of the needle sleeve 230 is disposed within the mounting space of the housing 210 and is mounted on the inner wall of the housing 210 via a first bearing 231 and a second bearing 232 distributed at both ends of the main body, allowing the needle sleeve 230 to rotate freely within the housing 210. The needle tip extends out from the mounting space of the housing 210, and a tapered needle insertion hole 233 is formed at the front end of the needle tip for the free ends of the aforementioned first winding needle 110 and second winding needle 120 to be inserted therein. This prevents the free ends of the winding needles from deforming during the winding of the battery cell, and in some embodiments, it can also serve as a force-applying part to adjust the winding diameter of the winding needle assembly 100. This design for adjusting the winding diameter is a common design in the battery cell manufacturing industry and will not be described in detail here.

[0038] To stably mount the needle sleeve 230 within the housing 210, a first bearing 231 located at one end of the main body of the needle sleeve 230 abuts against a stepped surface on the inner wall of the housing 210 and is locked onto the needle sleeve 230 by a second bolt 234 and a second washer 235. The other end of the needle sleeve 230 is blocked by the nut portions of several locking bolts 236 to prevent it from slipping out of the housing 210. With this design, the needle sleeve 230 is assembled between the locking bolts 236 and the stepped surface within the housing 210 and can rotate freely within the housing 210.

[0039] like Figures 2 to 4 As shown, the second end of the housing 210 has an integrally formed disc portion 211. A hollow rod-shaped auxiliary needle 212 is mounted on the disc portion 211. The axis of the auxiliary needle 212 is approximately parallel to the axis of the aforementioned needle winding assembly 100, so as to fully contact the diaphragm passing through the needle winding assembly 100. Several air holes 213 are formed on the wall of the auxiliary needle 212, and these air holes 213 are connected to the hollow air passage space inside the auxiliary needle 212. One end of the auxiliary needle 212 is connected to a spiral air tube 215 through a connector 214, and the other end of the spiral air tube 215 is connected to a vacuum source. In order to make the structure of this embodiment stable and reduce the space occupied by the pipeline, the spiral portion of the spiral air tube 215 is sleeved on the outer periphery of the housing 210.

[0040] In summary, before operation, the free ends of the first winding needle 110 and the second winding needle 120 of the diaphragm folding component 200 in this embodiment are inserted into the needle insertion holes 233 of the needle sleeve 230. Simultaneously, the first and second diaphragms pass through the gap between the two winding needles and contact the auxiliary needle 212. At this time, under the action of an external vacuum source, the multiple air holes 213 of the auxiliary needle 212 adsorb and fix the diaphragm. Subsequently, the drive motor 220 starts, driving the housing 210 to rotate, thereby causing the auxiliary needle 212 on the disc portion 211 to rotate from its initial diaphragm adsorption position to the position of another folded diaphragm. During this process, since the needle sleeve 230 is connected to the housing 210 through the first bearing 231 and the second bearing 232, it is unaffected by the drive motor 220 and will not cause frictional interference with the free ends of the winding needles. When the drive motor 220 stops rotating, the needle sleeve 230 can still rotate unaffected along with the first winding needle 110 and the second winding needle 120.

[0041] To facilitate control of the rotation angle of the auxiliary needle 212, a positioning ring 216 is fixedly fitted onto the housing 210, and a positioning hole 217 is formed on the positioning ring 216; a photoelectric sensor 218 is installed on one side of the positioning ring 216. The position of the positioning hole 217 detected by the photoelectric sensor 218 can provide a position signal for the motor to start / stop.

[0042] Combination Figures 2 to 4Referring to Figures 1(A) to 1(C), the working process of the cell winding mechanism in this embodiment is as follows: In the initial stage of the winding process, the first winding needle 110 and the second winding needle 120 extend from the base 130 and clamp the first diaphragm S1 and the second diaphragm S2. The free ends of the two winding needles are inserted into the insertion holes 233 of the diaphragm folding member 200. At this time, the free end S12 of the diaphragm formed by the stacking of the first diaphragm S1 and the second diaphragm S2 extends out from between the two winding needles; then, the external vacuum source is activated, so that the free end S12 of the diaphragm is fixed by the auxiliary needle 212 of the diaphragm folding member 200. Subsequently, the drive motor 220 of the diaphragm folding member 200 is activated, and the free end S12 of the diaphragm is folded along the cell winding direction by sensing the positioning hole 217 on the positioning ring 216 through the photoelectric sensor 218. Next, the first electrode P1 and the second electrode P2 are driven to be inserted into the set position of the diaphragm. In this embodiment, the first electrode P1 is inserted between the first diaphragm S1 and the second diaphragm S2, and the second electrode P2 is inserted between the free end S12 of the diaphragm and the first diaphragm S1, so that there are three layers of diaphragm on the inner periphery of the head of the first electrode P1.

[0043] In a preferred embodiment, the cell winding mechanism is further provided with a diaphragm cutting device 300. The diaphragm cutting device 300 includes a cutting mechanism 310 driven to approach / move from the free end S12 of the diaphragm and a pad 320 disposed opposite to the cutting mechanism 310. When the cutting function needs to be performed, the cutting mechanism 310 is driven to approach the free end S12 of the diaphragm and push it against the pad 320, and then continues to move forward to cut off the free end S12 of the diaphragm. The cutting mechanism 310 preferably has a heating function, for example, it can be achieved by a metal cutter supplemented with a heating rod or directly by a thermal resistance wire, so that the heads of the two diaphragms can be thermally fused together, so that the free ends of the diaphragms will not unravel when the diaphragm folding member 200 folds the two diaphragms.

[0044] In other embodiments, the auxiliary needle of the diaphragm folding member 200 can also be implemented by a gripper. The gripper uses two clamping rods driven by a cylinder to clamp from both sides of the free end S12 of the diaphragm, thereby preventing the free ends of the two diaphragms from spreading out.

[0045] Figure 5The illustrated embodiment is a battery cell winding apparatus that performs the winding methods shown in Figures 1(A) to 1(C). In this embodiment, three sets of winding needle assemblies 410 extend from the turret mechanism 430, and each winding needle assembly includes a first winding needle 411 and a second winding needle 412. During the operation of winding the battery cell, the three sets of winding needle assemblies 410 rotate with the turret mechanism 430 and are respectively located at the winding station 431, the finishing station 432, and the unloading station 433 to perform the battery cell winding, finishing adhesive application, and battery cell unloading processes. The winding mechanism also includes a diaphragm-cutting mechanism 440, consisting of a cutting mechanism 441 and a pad 442, used to cut the diaphragm strip after the winding needles have moved from the winding station 431 to the finishing station 432. This allows the winding needle assembly 410 at the winding station 431 to begin a new winding operation, and the winding needle assembly 410 at the finishing station 432 to perform a finishing adhesive application operation on the wound cell C. This repositioning winding method is a standard solution in the industry and will not be described in detail here.

[0046] like Figure 5 As shown, the cell winding method of this embodiment includes the following steps: First, the first separator S1 and the second separator S2 pass through the winding needle assembly 410 of the winding station 431 and expose a section of the free end S12 of the separator; then, the separator folding mechanism 450 pulls the free end S12 of the separator along the winding direction of the winding needle so that the free end S12 of the separator is attached to the outside of the second separator S2, so that the bent part of the free end S12 of the separator in contact with the winding needle assembly 410 covers the surface of the winding needle assembly 410; then, the first electrode P1 and the second electrode P2 are inserted between the two separators S1 and S2. The specific insertion method can refer to the design method of the embodiment in Figure 1, so that there are three layers of separators between the heads of the first electrode P1 and the second electrode P2, and the inner ring of the electrode head that is prone to burrs has three layers of separators; then, the winding needle assembly 410 at the winding station 431 rotates along the winding direction to complete the cell winding operation. After winding is completed, the turret mechanism 430 flips and changes position, causing each winding needle mechanism 410 to flip one station in sequence. The winding needle mechanism 410 at the winding station 431 moves to the adhesive application station 432 to perform the final adhesive application operation of the battery cell C. The winding needle mechanism 410 originally located at the adhesive application station 432 moves to the unloading station 433, so that the battery cell C is removed from the winding needle mechanism 410.

[0047] like Figure 6 , Figure 7 As shown, the battery cell winding device includes a winding mechanism and a diaphragm folding mechanism 450. The winding mechanism includes a turret mechanism 430 and three sets of winding needle assemblies 410 disposed on the turret mechanism 430. The three sets of winding needle assemblies 410 are located at the winding station, the finishing station, and the unloading station, respectively, and switch cyclically between the three stations with the turret mechanism 430 to perform the corresponding winding, finishing, and unloading operations.

[0048] The diaphragm folding mechanism 450 includes a mounting base 451, on which three sets of... Figure 3 The diaphragm folding components 200 shown correspond to a set of winding needle assemblies 410. A mounting base 451 is mounted on a shifting motor 452, allowing the positions of the three sets of diaphragm folding components 200 to be switched as the winding needles of the winding mechanism shift. To ensure synchronous rotation of the winding mechanism and the diaphragm folding mechanism 450, a support shaft 460 connects the turret mechanism 430 and the mounting base 451.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0050] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. All should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery cell winding mechanism, characterized in that, Used for winding a first electrode, a second electrode, a first diaphragm, and a second diaphragm into a battery cell, comprising: A winding assembly is configured to rotate along a winding direction to prepare a battery cell. The winding assembly includes a first winding needle and a second winding needle arranged side by side along a first direction, with a gap between the first winding needle and the second winding needle for the first diaphragm and the second diaphragm to pass through. The diaphragm folding component includes an auxiliary needle arranged along the first direction and a driving component that drives the auxiliary needle to rotate by a preset angle along the winding direction.

2. The cell winding mechanism according to claim 1, characterized in that, The diaphragm component includes a housing, the first end of which is connected to a driving device, and the second end of which is fitted with the auxiliary needle.

3. The cell winding mechanism according to claim 2, characterized in that, The auxiliary needle has an internal air channel and several air holes communicating with the air channel. The air channel is connected to a vacuum source, and the air holes are used to adsorb the first diaphragm and the second diaphragm under the action of the vacuum source.

4. The cell winding mechanism according to claim 3, characterized in that, The air passage of the auxiliary needle is connected to the vacuum source through a spiral air tube, and the spiral air tube is sleeved on the housing.

5. The cell winding mechanism according to claim 2, characterized in that, The auxiliary needle includes a clamping rod that can be driven to approach and separate, the clamping rod being used to clamp the first diaphragm and the second diaphragm from both sides.

6. The cell winding mechanism according to claim 2, characterized in that, The housing has a needle tip sleeve inside, which extends from the second end of the housing, and the front end of the needle tip sleeve has a needle insertion hole for accommodating the free end of the coiling needle assembly.

7. The cell winding mechanism according to claim 6, characterized in that, The two ends of the needle sleeve are respectively fitted into a first bearing and a second bearing, and the first bearing and the second bearing are disposed inside the sleeve.

8. The cell winding mechanism according to claim 2, characterized in that, A positioning ring is provided on the housing; a sensor is provided on one side of the positioning ring, and the sensor determines the rotation angle of the auxiliary needle by detecting the angle through which the positioning ring rotates.

9. A battery cell winding device, characterized in that, Used for winding a first electrode, a second electrode, a first diaphragm, and a second diaphragm into a battery cell, comprising: The turret mechanism includes a winding station, a finishing station and a unloading station arranged along the circumferential direction. Each station is provided with a winding needle assembly, which is used to clamp the first diaphragm and the second diaphragm and wind the first diaphragm, the second diaphragm, the first electrode and the second electrode into a battery cell. A diaphragm folding mechanism includes a mounting base and three sets of diaphragm folding components disposed on the mounting base. Each diaphragm folding component is disposed opposite to a needle winding assembly, and each diaphragm folding component includes an auxiliary needle disposed parallel to the needle winding assembly and a driving member for driving the auxiliary needle to move along the rotation direction of the needle winding assembly.

10. The cell winding apparatus according to claim 9, characterized in that, A diaphragm device is provided between the winding station and the finishing station to cut the first diaphragm and the second diaphragm.

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