Diaphragm feeding mechanism after separation of diaphragm pre-rolling stub bar

Abstract

The utility model discloses a diaphragm pre-winding stub bar separated sheet feeding mechanism which comprises a cell winding subassembly and an auxiliary sheet feeding subassembly, the cell winding subassembly comprises a winding needle, a diaphragm pressing plate and an upper air suction pipe, the diaphragm pressing plate is arranged below the winding needle and adsorbs a falling lower diaphragm stub bar through negative pressure, the upper air suction pipe is arranged above the winding needle, and the auxiliary sheet feeding subassembly is arranged above the upper air suction pipe. The auxiliary sheet feeding assembly is arranged on the left side of the battery cell winding assembly and comprises a sheet feeding guide block and a lower air blowing pipe, the sheet feeding guide block is arranged on the lower air blowing pipe, the lower air blowing pipe blows air upwards towards the falling upper diaphragm stub bar through negative pressure, the upper diaphragm stub bar moves upwards, two layers of diaphragms of the diaphragm stub bar are separated, and the upper diaphragm stub bar and the lower diaphragm stub bar are separated. And after the upper diaphragm stub bar is vertically and flatly attached to the upper diaphragm under negative pressure, the lower blowing pipe stops blowing, the left pole piece is guided into the middle of the two layers of diaphragms of the diaphragm stub bar through the piece feeding guide block, and then the battery cell is wound. The phenomenon that the diaphragm is punctured can be prevented, so that the percent of pass is increased, and the processing cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of lithium batteries, and in particular to a diaphragm pre-roll head separation and subsequent sheet feeding mechanism. Background Art

[0002] In the lithium battery industry, cylindrical batteries are made by a pair of winding needles that wind up the upper and lower layers of diaphragms and wrap the positive and negative electrodes in a continuous winding. When the electrode is inserted between the diaphragms, the winding needle needs to pre-wind the diaphragm to a certain length in advance to tighten the diaphragm, and then insert the electrode between the diaphragm layers to complete the battery cell winding. When the electrode is inserted between the diaphragm layers, there are two situations in which the diaphragm is pre-wound: when the diaphragm material head is fully wound (such as Figure 1 ) and the diaphragm material head is not completely wound when entering the sheet (such as Figure 2 ). For Figure 2 When the diaphragm is not fully pre-rolled, the two layers of diaphragms are in a hanging state because the diaphragm head is affected by gravity. After the left pole piece is inserted, the heads of the left and right pole pieces are separated by the upper diaphragm and the diaphragm head + lower diaphragm. At this time, the minimum distance between the heads of the two pole pieces is the thickness t of the single-layer diaphragm (the upper and lower diaphragms are made of the same material and have the same thickness). In the previous process of cutting the pole piece, the edge of the pole piece cutter is not sharp enough or the gap between the moving and fixed blades is too large, resulting in the burr height h of the pole piece head cut being too large (h≥t) after the pole piece is cut, and then the diaphragm is pierced by the pole piece burr during the winding process of the battery cell, resulting in the short circuit and scrapping of the battery cell. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a membrane pre-roll head separation and subsequent sheet feeding mechanism.

[0004] The technical solution of the present invention is as follows:

[0005] The diaphragm pre-roll head is separated and then the sheet is fed into the mechanism, comprising a battery cell winding part and an auxiliary sheet feeding part, wherein the battery cell winding part comprises a winding needle, a diaphragm pressing plate and an upper suction pipe, the diaphragm pressing plate is arranged below the winding needle, and absorbs the hanging lower diaphragm head by negative pressure, the upper suction pipe is arranged above the winding needle, and sucks air upward by negative pressure, the auxiliary sheet feeding part is arranged on the left side of the battery cell winding part, the auxiliary sheet feeding part comprises a sheet feeding guide block and a lower air blowing pipe, the sheet feeding guide block is arranged on the lower air blowing pipe, the lower air blowing pipe blows air upward in the direction of the hanging upper diaphragm head by negative pressure, so that the upper diaphragm head moves upward, and the two layers of diaphragms of the diaphragm head are separated, until the upper diaphragm head is vertically flat against the upper diaphragm under the negative pressure, and then the lower air blowing pipe closes the blowing, and the left pole sheet is introduced into the middle of the two layers of diaphragms of the diaphragm head through the sheet feeding guide block, and then the battery cell is wound.

[0006] Wherein, the battery cell winding device is equipped with a motor to drive a winding needle for winding.

[0007] Wherein, the auxiliary sheet introduction part is equipped with a cylinder to drive the sheet introduction guide block to introduce the pole piece.

[0008] Compared with the prior art, the beneficial effect of the present invention is that the present invention can realize the insertion of the pole piece into the middle of the two layers of diaphragms of the diaphragm head when the diaphragm head is not completely wound. When the left pole piece is inserted into the middle of the diaphragms on both sides, the left and right pole piece heads are separated by the two layers of diaphragms, and the distance between the two-level head portions is the thickness of the two layers of diaphragms, that is, s=2t. Therefore, during the winding process of the battery cell, the condition for the diaphragm to be pierced is h≥2t. Therefore, the probability of piercing the diaphragm due to the excessive height h of the pole piece incision burr can be further reduced, thereby improving the overall qualified rate of the cylindrical battery cell. At the same time, due to the change in the condition of diaphragm piercing, it can be considered to reduce certain requirements when making the pole piece cutter, so as to achieve the purpose of reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 This is a schematic diagram of the existing diaphragm material head being inserted after it is completely wound;

[0011] Figure 2 It is a schematic diagram of the existing diaphragm material head not being completely wound and the diaphragm not being separated into sheets;

[0012] Figure 3 A schematic diagram of the structure of a membrane pre-roll head separation and subsequent sheet feeding mechanism provided by the present invention;

[0013] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0014] Figure 5 This is a schematic diagram of the diaphragm material head of the present invention being not completely wound and then separated and put into the sheet. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below for illustration.

[0017] Example

[0018] See also Figure 3 , Figure 4 , this embodiment provides a mechanism for feeding the film after the separation of the diaphragm pre-rolled material head, including a battery cell winding part 1 and an auxiliary film feeding part 2. Among them, the battery cell winding part 1 includes a winding needle 11, a diaphragm pressing plate 12 and an upper suction pipe 13, the diaphragm pressing plate 12 is arranged below the winding needle 11, the upper suction pipe 13 is arranged above the winding needle 11, and the battery cell winding part 2 drives the winding needle 11 to wind by a motor; the auxiliary film feeding part 2 is arranged on the left side of the battery cell winding part 1, and the auxiliary film feeding part 2 includes a film feeding guide block 21 and a lower blowing pipe 22, the film feeding guide block 21 is arranged on the lower blowing pipe 22, and the auxiliary film feeding part 2 drives the film feeding guide block 21 by a cylinder to carry out the electrode sheet introduction action, so that the electrode sheet can be inserted into the middle of the two layers of diaphragms of the diaphragm material head when the diaphragm material head is not completely wound, such as Figure 5 As shown, when the left pole piece is inserted between the two side material head diaphragms, the left and right pole piece material heads are separated by two layers of diaphragms, and the distance between the two-stage piece heads is the thickness of the two layers of diaphragms, that is, s=2t. Therefore, during the winding process of the battery cell, the condition for the diaphragm to be pierced is h≥2t. Therefore, the probability of piercing the diaphragm due to the excessive height h of the pole piece cut burr can be further reduced, thereby improving the overall qualified rate of the cylindrical battery cell. At the same time, due to the change in the conditions for the diaphragm to be pierced, it can be considered to reduce certain requirements when making the pole piece cutter, so as to achieve the purpose of reducing processing costs.

[0019] Working principle: When the diaphragm is wound around the winding needle 11 for one circle clockwise, the winding needle 11 stops rotating, the negative pressure on the diaphragm pressing plate 12 is turned on, and the diaphragm head hangs down under the action of gravity and the negative pressure of the diaphragm pressing plate, and the lower diaphragm head is adsorbed by the diaphragm pressing plate 12. At this time, the upper suction pipe 13 opens with negative pressure to inhale air upward, and the lower blowing pipe 22 blows air upward in the direction of the hanging upper diaphragm head through negative pressure, so that the upper diaphragm head moves upward, and the two layers of diaphragms of the diaphragm head are separated until the upper diaphragm head is vertically attached to the upper diaphragm due to the negative pressure. Then the lower blowing pipe 22 stops blowing, and the left pole piece is introduced into the middle of the two layers of diaphragms of the diaphragm head through the sheet entry guide block 21, and then the battery cell is wound.

[0020] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A membrane pre-roll head separation and subsequent sheet feeding mechanism, characterized in that: The battery cell winding device comprises a battery cell winding portion and an auxiliary sheet feeding portion, wherein the battery cell winding portion comprises a winding needle, a diaphragm pressing plate and an upper air suction pipe, wherein the diaphragm pressing plate is arranged below the winding needle and absorbs the hanging lower diaphragm material head by negative pressure, the upper air suction pipe is arranged above the winding needle and draws air upward by negative pressure, the auxiliary sheet feeding portion is arranged on the left side of the battery cell winding portion, the auxiliary sheet feeding portion comprises a sheet feeding guide block and a lower air blowing pipe, the sheet feeding guide block is arranged on the lower air blowing pipe, the lower air blowing pipe blows air upward in the direction of the hanging upper diaphragm material head by negative pressure, so that the upper diaphragm material head moves upward, and the two layers of diaphragms of the diaphragm material head are separated, until the upper diaphragm material head is vertically attached to the upper diaphragm by the negative pressure, and then the lower air blowing pipe stops blowing, and the left pole sheet is introduced into the middle of the two layers of diaphragms of the diaphragm material head through the sheet feeding guide block, and then the battery cell is wound.

2. The membrane pre-roll head separation and subsequent sheet feeding mechanism according to claim 1, characterized in that: The battery core winding device drives the winding needle to perform winding by means of a motor.

3. The membrane pre-roll head separation and subsequent sheet feeding mechanism according to claim 1, characterized in that: The auxiliary plate-feeding part drives the plate-feeding guide block through the cylinder to introduce the pole piece.

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