Lithium battery naked cell lamination mechanism

Abstract

The utility model provides a lithium battery naked cell lamination mechanism. The lithium battery naked cell lamination mechanism comprises a rotating base and a rotating mechanism for driving the rotating base to rotate around a preset axis in a reciprocating manner, the left side and the right side of the rotating base are each provided with a stacking table, and each stacking table is provided with a pressing cutter and a diaphragm. The rotating mechanism drives the rotating base to rotate back and forth between the first pole piece stacking position and the second pole piece stacking position, a first feeding centering platform is arranged on one side of the first pole piece stacking position, and a second feeding centering platform is arranged on one side of the second pole piece stacking position. According to the utility model, the horizontal movement of the stacking tables in the prior art is changed into the rotary reciprocating movement, so that the two parallel stacking tables can be arranged on the rotary base, the two stacking tables can perform synchronous lamination in the reciprocating rotation process of the rotary base, and the synchronous rotation of the two stacking tables can be realized only by using one power mechanism; the cost is reduced, the lamination efficiency is improved, the number of equipment does not need to be increased, and the equipment cost, the occupied space and the labor cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery lamination, in particular to a lithium battery bare core lamination mechanism. Background Art

[0002] In the prior art, common lithium battery bare cell stacking mechanisms usually use a stacking table translation, or a method of stacking the front and back sides of the diaphragm flatly. The principle is to make the diaphragm move in a Z shape from top to bottom during the above process, so as to achieve a layer of diaphragm, a layer of positive electrode sheet, a layer of diaphragm, and a layer of negative electrode sheet. This method is often referred to as Z stacking. Another stacking method in the prior art is winding, which uses a similar method to winding. The difference is that each layer of electrode sheet is cut and pressed together with the diaphragm for winding. However, the stacking efficiency of the above two stacking mechanisms is low. In order to improve PPM, the only way is to increase the number of equipment, which not only increases the cost of the equipment, but also increases the occupied space and labor costs. Utility Model Content

[0003] The utility model provides a lithium battery bare cell stacking mechanism to solve at least one of the above technical problems.

[0004] To solve the above problems, as one aspect of the utility model, a lithium battery bare cell stacking mechanism is provided, comprising: a rotating base and a rotating mechanism for driving the rotating base to reciprocate around a predetermined axis;

[0005] A stacking platform is provided on each of the left and right sides of the rotating base, and each stacking platform is provided with a pressing knife and a diaphragm;

[0006] The rotating mechanism drives the rotating base to reciprocate between the first pole piece stack and the second pole piece stack, a first loading and centering platform is provided on one side of the first pole piece stack, and a second loading and centering platform is provided on one side of the second pole piece stack;

[0007] The first loading and centering platform stacks the first pole piece on the stacking platform located at the first pole piece stacking position when the rotating base is located at the first pole piece stacking position;

[0008] The second loading and centering platform stacks the second pole piece on the stacking platform located at the second pole piece stacking position when the rotating base is located at the second pole piece stacking position;

[0009] The polarity of the first pole piece is opposite to that of the second pole piece.

[0010] Preferably, the first loading centering platform and the second loading centering platform have the same structure.

[0011] Preferably, the first loading and centering platform includes a gripping mechanism for gripping the first pole piece, a rotating mechanism for rotating the first pole piece on the gripping mechanism to a parallel position parallel to the first pole piece stack, and a telescopic mechanism for translating the first pole piece in the parallel position to the stacking platform.

[0012] Preferably, diaphragm cutters are provided at both the first pole piece stack and the second pole piece stack.

[0013] Preferably, the rotating base rotates along a vertical or horizontal axis.

[0014] Due to the adoption of the above technical scheme, the utility model changes the horizontal movement of the stacking table in the prior art into a rotational reciprocating motion, so that two parallel stacking tables can be arranged on a rotating base. In this way, the two stacking tables can perform synchronous stacking during the reciprocating rotation of the rotating base, and only one power mechanism is used to achieve the synchronous rotation of the two stacking tables, which not only reduces the cost but also improves the efficiency of stacking, without increasing the number of equipment, reducing the equipment cost, occupied space and labor cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The basic principle structure diagram of the lamination is schematically shown;

[0016] Figure 2 The structure of the utility model is schematically shown Figure 1 ;

[0017] Figure 3 The utility model schematically shows a schematic diagram of a battery cell with the right stack removed;

[0018] Figures 4A-4C The schematic diagram of the lamination process of the utility model is schematically shown.

[0019] Reference numerals in the figure: rotating base 1; stacking table 2; pressing knife 3; diaphragm 4; ejector plate 5; blanking clamp 6; first pole piece 7; second pole piece 8; diaphragm cutter 9; negative pole piece 10; positive pole piece 11; 12, battery cell. DETAILED DESCRIPTION

[0020] The following is a detailed description of the embodiments of the present invention, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0021] As one aspect of the utility model, a lithium battery bare cell stacking mechanism is provided, comprising: a rotating base 1 and a rotating mechanism for driving the rotating base 1 to reciprocate around a predetermined axis. The rotating mechanism drives the rotating base 1 to continuously reciprocate (forward and reverse rotation) around the rotating axis of the rotating base 1. Preferably, the rotating base 1 rotates along a vertical or horizontal axis.

[0022] A stacking platform 2 is provided on each of the left and right sides of the rotating base 1, and each stacking platform 2 is provided with a pressing knife 3 and a diaphragm 4. Each stacking platform 2 can be used to form a battery cell 12, so that the rotating base 1 can form two battery cells 12 at a time through its reciprocating rotation, thereby improving production efficiency. The stacking process on the stacking platform 2 forms vertically stacked pole pieces.

[0023] For example, the rotating mechanism drives the rotating base 1 to rotate back and forth between the first pole piece stack and the second pole piece stack. A first loading centering platform (not shown in the figure) is provided on one side of the first pole piece stack, and a second loading centering platform (not shown in the figure) is provided on one side of the second pole piece stack. When the stacking platform 2 on one side of the rotating base 1 rotates to the first pole piece stack, the stacking platform on the other side rotates to the second pole piece stack. When the first pole piece stack / the second pole piece stack, the diaphragm 4 at the corresponding stacking platform 2 is in a flattened state, at this time, a pole piece can be stacked on the outside thereof. As the rotating base 1 rotates in the opposite direction, the outside of the stacked pole piece is coated with a layer of diaphragm 4. By rotating and stacking in this way, positive and negative pole pieces that are stacked and staggered in sequence can be formed on the stacking platform 2, and the two are S-shapedly coated and separated by the diaphragm 4, and finally a battery cell 12 is formed.

[0024] When the rotating base 1 is in the first pole piece stacking position, the first loading and centering platform stacks the first pole piece 7 on the stacking platform 2 in the first pole piece stacking position; when the rotating base 1 is in the second pole piece stacking position, the second loading and centering platform stacks the second pole piece 8 on the stacking platform 2 in the second pole piece stacking position. The polarity of the first pole piece 7 is opposite to that of the second pole piece 8. For example, when the first pole piece 7 is a negative pole piece, the second pole piece 8 is a positive pole piece; when the first pole piece 7 is a positive pole piece, the second pole piece 8 is a negative pole piece.

[0025] In this way, when the rotating base 1 switches back and forth between the first pole piece stacking position and the second pole piece stacking position, for the stacking platform 2 at the first pole piece stacking position, the first pole piece 7 can be stacked by the first loading and centering platform; for the stacking platform 2 at the second pole piece stacking position, the second pole piece 7 can be stacked by the second loading and centering platform. Since the polarities of the first pole piece 7 and the second pole piece 8 are opposite,

[0026] Preferably, the first loading and centering platform has the same structure as the second loading and centering platform. Preferably, the first loading and centering platform can grab the first pole piece 7 and rotate the first pole piece 7 to a state parallel to the first pole piece stack. The first loading and centering platform includes a grabbing mechanism for grabbing the first pole piece 7, a rotating mechanism for rotating the first pole piece 7 on the grabbing mechanism to a parallel position parallel to the first pole piece stack, and a telescopic mechanism for translating the first pole piece 7 in the parallel position to the stacking platform 2. Among them, the above-mentioned grabbing and rotation functions that can be achieved by the first loading and centering platform can be achieved by conventional mechanisms in the field, such as grabbing by a suction cup and rotating by a mechanism such as a rotating motor, which belongs to the prior art and will not be described here.

[0027] Preferably, a diaphragm cutter 9 is provided at the first electrode stack and the second electrode stack to cut the diaphragm 4 at the battery cell 12 after the stacking is completed. When cutting, the ejector plate 5 pushes out the battery cell 12, and then the battery cell 12 is taken away by the cutting clamp 6.

[0028] Please refer to Figure 2-3 The lithium battery bare cell stacking mechanism in the utility model is provided with two parallel stacking platforms on the rotating base 1, which can be called A / B stacking platforms, and two rolls of diaphragms are used to deal with the A\B sides respectively. For example, the left side is the positive electrode stack (the first pole piece stacking), and the right side is the negative electrode stack (the second pole piece stacking). The rotating base 1 can rotate forward and reverse around its central axis, and the diaphragm 4 is composed of two rolls, one above the other, which deal with the left and right stacking platforms 2 respectively.

[0029] The working process and principle of the A / B stacking stage are described in detail below.

[0030] (1) A stacking platform stacking: The diaphragm 4 on it is in a flattened state and rotates counterclockwise to the positive electrode stacking position. During this process, the positive electrode sheet 11 is synchronously grabbed and rotated from the centering position by the first feeding centering platform, horizontally extended and stacked on the diaphragm 4 of the stacking platform 2, and the pressing knife 3 presses the electrode sheet and follows the stacking platform 2 to rotate clockwise to the negative electrode stacking position. At this time, the diaphragm 4 gradually covers the positive electrode sheet 11. During the process, the negative electrode sheet 10 is synchronously grabbed and rotated from the centering position by the second feeding centering platform, horizontally extended and stacked on the diaphragm 4 of the stacking platform 2. After the pressing knife 3 presses the electrode sheet, it rotates counterclockwise to the positive electrode stacking position, and the diaphragm 4 gradually covers the negative electrode sheet...

[0031] (2) Stacking of stacking platforms B: The diaphragm 4 thereon is in a flattened state and rotates clockwise to the positive electrode stacking position. During this process, the positive electrode sheet 11 is synchronously grabbed and rotated from the centering position by the first loading centering platform, stretched out horizontally and stacked on the diaphragm 4 of the stacking platform 2, and the pressing knife 3 presses the electrode sheet and rotates counterclockwise to the negative electrode stacking position following the stacking platform 2. At this time, the diaphragm 4 gradually covers the positive electrode sheet 11. During the process, the negative electrode sheet 10 is synchronously grabbed and rotated from the centering position by the second loading centering platform, stretched out horizontally and stacked on the diaphragm 4 of the stacking platform 2. After the pressing knife 3 presses the electrode sheet, it rotates clockwise to the positive electrode stacking position, and the diaphragm 4 gradually covers the negative electrode sheet.

[0032] When the number of electrode stacks reaches a predetermined value, the stacking platform 2 extends out of the ejector plate 5, leaving space for the blanking clamp 6 to enter and exit. The blanking clamp 6 clamps the battery cell 12 and leaves the stacking platform 2. The diaphragm cutter 9 cuts the diaphragm 4. During the production process, the above operations (1) and (2) are repeated continuously.

[0033] After a cycle, due to the change in position after the diaphragm is cut off, the first negative electrode sheet in the new stacking process can be achieved by exchanging the incoming positive and negative electrode sheets or the bottom double diaphragms, or by reversely laying the diaphragms.

[0034] Due to the adoption of the above technical scheme, the utility model changes the horizontal movement of the stacking table 2 in the prior art into a rotational reciprocating motion, so that two parallel stacking tables 2 can be set on the rotating base 1. In this way, the two stacking tables 2 can perform synchronous stacking during the reciprocating rotation of the rotating base 1, and only one power mechanism is used to achieve the synchronous rotation of the two stacking tables, which not only reduces the cost but also improves the efficiency of stacking, without increasing the number of equipment, reducing the equipment cost, occupied space and labor cost.

[0035] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lithium battery bare cell stacking mechanism, characterized in that: include: A rotating base (1) and a rotating mechanism for driving the rotating base (1) to reciprocate around a predetermined axis; A stacking platform (2) is provided on each of the left and right sides of the rotating base (1), and each stacking platform (2) is provided with a pressing knife (3) and a diaphragm (4); The rotating mechanism drives the rotating base (1) to rotate back and forth between a first pole piece stack and a second pole piece stack, a first loading and centering platform is provided on one side of the first pole piece stack, and a second loading and centering platform is provided on one side of the second pole piece stack; The first loading and centering platform stacks the first pole piece (7) on the stacking platform (2) in the first pole piece stacking position when the rotating base (1) is in the first pole piece stacking position; When the rotating base (1) is in the second pole piece stacking position, the second loading and centering platform stacks the second pole piece (8) on the stacking platform (2) in the second pole piece stacking position; The polarity of the first pole piece (7) and the polarity of the second pole piece (8) are opposite.

2. The bare lithium battery core stacking mechanism according to claim 1, characterized in that: The first loading centering platform and the second loading centering platform have the same structure.

3. The bare lithium battery core stacking mechanism according to claim 2, characterized in that: The first loading and centering platform comprises a gripping mechanism for gripping the first pole piece (7), a rotating mechanism for rotating the first pole piece (7) on the gripping mechanism to a parallel position parallel to the first pole piece stack, and a telescopic mechanism for translating the first pole piece (7) in the parallel position to the stacking platform (2).

4. The bare lithium battery cell stacking mechanism according to claim 1, characterized in that: Diaphragm cutters (9) are provided at both the first pole piece stack and the second pole piece stack.

5. The bare lithium battery core stacking mechanism according to claim 1, characterized in that: The rotating base (1) rotates along a vertical or horizontal axis.

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