Pre-pressing shaping mechanism for winding of winding tail end of battery cell

Abstract

The utility model relates to a pre-pressing and shaping mechanism for winding at the winding tail end of a battery cell, which is characterized by comprising a bracket, a first pre-pressing and shaping roller and a second pre-pressing and shaping roller, and the first pre-pressing and shaping roller and the second pre-pressing and shaping roller are respectively supported on the bracket in parallel through bearings; the first pre-pressing shaping roller and the second pre-pressing shaping roller are connected with a power transmission mechanism to form a pre-pressing shaping mechanism, and the pre-pressing shaping mechanism is arranged in front of the tail end winding drum. According to the utility model, the opening alignment degree and the fitting consistency of the current winding core can be optimized and improved, and the phenomena of folding and internal shrinkage of the winding diaphragm are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery cell manufacturing technology, and in particular to a pre-pressing and shaping mechanism for winding the end of a cell. Background Art

[0002] The core is formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet and then winding them. The general process of the battery cell winding process is: after the positive and negative electrode sheets and separators are unwound by the unwinding mechanism, they pass through multiple roller mechanisms and undergo caching, length measurement, deviation correction, cutting, compounding, winding, gluing and other processes to obtain the core. The existing battery cell winding technology is the electrode sheet + separator unwinding, and the end is designed for the winding process. Due to the difference in the matching degree of the positive and negative electrode sheets and the separator, the membrane will fold over and shrink inward at the edge of the open end of the winding core, which is more obvious after pre-cold pressing and hot pressing. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the prior art and provides a pre-pressing and shaping mechanism for winding the end of a battery core, thereby improving the alignment and consistency of the two open ends of the core.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a pre-stressing and shaping mechanism for winding the battery cell at the end, including a bracket, a first pre-stressing and shaping roller and a second pre-stressing and shaping roller, the first pre-stressing and shaping roller and the second pre-stressing and shaping roller are respectively supported in parallel on the bracket through bearings, the first pre-stressing and shaping roller and the second pre-stressing and shaping roller are connected to the power transmission mechanism to form a pre-stressing and shaping mechanism, and the pre-stressing and shaping mechanism is placed in front of the end winding drum.

[0005] Furthermore, the bracket is fixedly connected to the frame of the core winding machine.

[0006] Furthermore, the first pre-pressing and shaping roller includes a roller body and a support shaft. The support shafts are provided at both ends of the roller body to form an integral structure in the shape of a stepped shaft. The second pre-pressing and shaping roller has the same shape as the first pre-pressing and shaping roller.

[0007] Furthermore, a concave platform is provided in the middle of the roller body of the first pre-pressing and shaping roller, the diameter of the concave platform is Φ25-35 mm; the width of the concave platform is ≤ the width of one side of the roller body 5-7 mm.

[0008] Furthermore, the shape of the second pre-pressing and shaping roller is the same as that of the first pre-pressing and shaping roller.

[0009] Furthermore, a pulley and a gear are keyed to one end of the support shaft of the first pre-pressing shaping roller, and the gear is engaged with a gear keyed to one end of the support shaft of the second pre-pressing shaping roller, and the pulley is connected to the motor of the winding drum through a belt.

[0010] Furthermore, the first pre-pressing and shaping roller and the second pre-pressing and shaping roller are made of soft rubber material.

[0011] Furthermore, the diameters of the first pre-pressing shaping roller and the second pre-pressing shaping roller are Φ30-40 mm respectively, the length of the shaping roller matches the width of the winding core, and the gap between the two rollers is 0.1-0.20 mm.

[0012] Beneficial effects: Compared with the prior art, the utility model can optimize and improve the opening alignment and fitting consistency of the current winding core, and reduce the folding and internal shrinkage of the winding diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a schematic diagram of the power structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the working principle of the winding pre-pressing shaping roller;

[0016] Figure 4 It is a schematic diagram of the winding process in the prior art.

[0017] In the figure: 1. bracket, 2. first pre-pressing and shaping roller, 2-1. roller body, 2-2. support shaft, 2-3. concave platform, 3. second pre-pressing and shaping roller, 4. pulley, 5. driving gear, 6. driven gear, 7. belt, 8. motor, 9. winding reel.

[0018] h, width of one side of the roller body DETAILED DESCRIPTION

[0019] The following is a detailed description of the specific implementation method provided by the present invention in combination with the preferred embodiment: See the accompanying drawings for details. This embodiment provides a pre-stressing and shaping mechanism for winding the battery cell at the end, including a bracket 1, a first pre-stressing and shaping roller 2 and a second pre-stressing and shaping roller 3. The first pre-stressing and shaping roller and the second pre-stressing and shaping roller are respectively supported in parallel on the bracket through bearings. The first pre-stressing and shaping roller and the second pre-stressing and shaping roller are connected to the power transmission mechanism to form a pre-stressing and shaping mechanism. The pre-stressing and shaping mechanism is placed in front of the end winding drum 9.

[0020] Preferably, the bracket is fixed to the frame of the core winding machine.

[0021] Preferably, the first pre-pressing shaping roller includes a roller body 2-1 and a support shaft 2-2, and support shafts are provided at both ends of the roller body to form an overall structure in the shape of a stepped shaft. The second pre-pressing shaping roller has the same shape as the first pre-pressing shaping roller.

[0022] Preferably, the first pre-pressing shaping roller has 2-3 recesses in the middle of the roller body, with a diameter of Φ25-35mm; the width of the recess is ≤ the width of the roller body on one side h = 5-7mm. The purpose of providing the recesses is to concentrate the shaping force at the open end of the winding core, avoiding uneven thickness of the pole piece in the middle that affects the shaping effect at the open end.

[0023] Preferably, the shape of the second pre-pressing and shaping roller is the same as that of the first pre-pressing and shaping roller.

[0024] Preferably, a pulley 4 and a driving gear 5 are keyed to one end of the support shaft of the first pre-pressing shaping roller, and the driving gear is engaged with a driven gear 6 keyed to one end of the support shaft of the second pre-pressing shaping roller, and the pulley is connected to the motor 8 of the winding drum through a belt 7.

[0025] Preferably, the first pre-pressing and shaping roller and the second pre-pressing and shaping roller are made of soft rubber material.

[0026] Preferably, the diameters of the first and second pre-pressing shaping rollers are Φ30-40 mm respectively, and the length of the shaping rollers matches the width of the winding core. In this embodiment, the length of the shaping rollers is 130-140 mm. The gap between the two rollers is 0.1-0.20 mm.

[0027] The working principle of the pre-pressing and shaping rollers of the pre-pressing and shaping mechanism: two soft pre-pressing and shaping rollers are used for local rolling, so that the open end of the battery core is fitted before winding, reducing the adverse effects of diaphragm shrinkage, folding, etc.

[0028] Working process

[0029] 1. Add a pre-pressing and shaping roller mechanism in front of the reel at the end of the battery cell winding mechanism;

[0030] 2. The pre-pressing and shaping roller structure is mainly parallel to each other, with the middle part being a boss structure. The design focuses on the first-level pre-pressing, shaping and laminating at the two end openings of the core.

[0031] 3. The design value of the gap between the pre-pressing shaping rollers is approximately: the thickness of the positive and negative electrode sheets + the thickness of the diaphragm - (0.1-0.2) mm, so as to ensure that the shaping rollers are fully pre-pressed with the opening of the electrode core;

[0032] 4. The material of the pre-pressing shaping roller can be a soft rubber roller;

[0033] 5. By widening the width of the shaping roller, the lug side can also be pre-pressed and shaped.

[0034] 6. After the battery cell pole pieces pass through the pre-pressing shaping roller, normal winding operation is carried out.

[0035] The above-mentioned detailed description of a pre-stressing and shaping mechanism for winding the end of a battery cell with reference to the embodiment is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the scope of protection of the present invention.

Claims

1. A pre-pressing and shaping mechanism for winding the end of a battery cell, characterized by: It includes a bracket, a first pre-pressure shaping roller and a second pre-pressure shaping roller. The first pre-pressure shaping roller and the second pre-pressure shaping roller are respectively supported in parallel on the bracket through bearings. The first pre-pressure shaping roller and the second pre-pressure shaping roller are connected to the power transmission mechanism to form a pre-pressure shaping mechanism. The pre-pressure shaping mechanism is placed in front of the end winding drum.

2. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 1, characterized in that: The bracket is fixed on the frame of the core winding machine.

3. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 1, characterized in that: The first pre-pressing and shaping roller includes a roller body and a support shaft. The support shafts are provided at both ends of the roller body to form an integral structure in the shape of a stepped shaft. The second pre-pressing and shaping roller has the same shape as the first pre-pressing and shaping roller.

4. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 1 or 3, characterized in that: A concave platform is provided in the middle of the roller body of the first pre-pressing and shaping roller, the diameter of the concave platform is Φ25-35mm; the width of the concave platform is ≤ the single side width of the roller body 5-7mm.

5. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 4, characterized in that: The second pre-pressing and shaping roller has the same shape as the first pre-pressing and shaping roller.

6. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 1, characterized in that: One end of the support shaft of the first pre-pressing and shaping roller is keyed with a pulley and a gear, and the gear is engaged with the gear keyed with one end of the support shaft of the second pre-pressing and shaping roller. The pulley is connected to the motor of the winding drum through a belt.

7. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 1, characterized in that: The first pre-pressing and shaping roller and the second pre-pressing and shaping roller are made of soft rubber material.

8. The pre-pressing and shaping mechanism for winding the battery cell end according to claim 1, characterized in that: The diameters of the first pre-pressing shaping roller and the second pre-pressing shaping roller are Φ30-40 mm respectively, the length of the shaping roller matches the width of the winding core, and the gap between the two rollers is 0.1-0.20 mm.

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