Battery cell winding mechanism

Abstract

The utility model discloses a kind of electric core winding mechanism, including center needle and the first power part of driving center needle rotation, pole piece assembly is wound to form electric core on center needle, also include the second power part of driving center needle reciprocating movement along the incoming material direction of pole piece assembly;The utility model has the beneficial effect that: in the process of being made winding electric core by the first power part driving center needle rotation, by the second power part driving center needle movement, and then adjust the tension of pole piece assembly when winding, and then release the internal stress of the electric core that has been wound in the process of winding, increase the gap between positive pole, diaphragm, negative pole, facilitate the infiltration of electrolyte when subsequent injection, immersion, finally improve the cycle life of battery.

Description

Technical Field

[0001] This utility model relates to the field of secondary battery production technology, and in particular to a cell winding mechanism. Background Technology

[0002] Rechargeable batteries are widely used in mobile phones, tablets, wearable devices, power banks, e-cigarettes, various digital products, power tools, power supplies, and energy storage, with a broad market application and great potential. As the application of rechargeable batteries becomes increasingly widespread, their capacity is also increasing.

[0003] Secondary batteries, in terms of appearance, include cylindrical batteries and prismatic batteries. The cells inside cylindrical batteries and some prismatic batteries are wound by a winding machine. The wound cells produced by this method have advantages such as high production efficiency and high material utilization. However, because the cells are always in a straightened and taut state during the winding process, the gaps between adjacent layers of the finished cells are too small. This results in high internal stress in the cells after winding, making it difficult for the electrolyte to penetrate during electrolyte injection. Consequently, the electrolyte injection and wetting of the battery are difficult, affecting the cycle life of the battery.

[0004] For example, the patent application number "CN202021527932.9" discloses a "cell winding device". During the winding process, the winding device that carries the cell only rotates and does not move in position, which results in the problem that the gap between the layers of the finished cell is too small. Summary of the Invention

[0005] The purpose of this invention is to provide a battery cell winding mechanism that can adjust the gap between layers during battery cell winding, thereby eliminating internal stress, facilitating subsequent electrolyte injection and wetting, and improving the cycle life of the battery.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A battery cell winding mechanism includes a center pin and a first power unit that drives the center pin to rotate. An electrode assembly is wound on the center pin to form a battery cell. The mechanism also includes a second power unit disposed on a base. The first power unit is mounted on a fixed seat. A guide assembly is disposed between the fixed seat and the base. The second power unit has a movable end for driving the fixed base to reciprocate along the feeding direction of the electrode assembly.

[0007] Preferably, the first power unit includes a motor, which drives the center needle to rotate through a transmission assembly; The second power unit includes a telescopic rod, which drives the fixed base, motor, transmission assembly and center pin to move by extending and retracting.

[0008] Preferably, the bottom of the fixed base is provided with a guide rail, the guide rail is connected to the telescopic rod, and the base is provided with a sliding groove that cooperates with the guide rail; The guide rail and the slide groove together form a guiding assembly.

[0009] Preferably, the transmission assembly includes a drive wheel connected to the motor, a driven wheel connected to the center pin, and a belt connecting the two.

[0010] Preferably, the driving wheel is mounted on a fixed base, and the fixed base is further provided with a connecting plate for mounting the driven wheel.

[0011] The beneficial effects of this utility model are as follows: 1. During the process of the first power unit driving the center needle to rotate to make the wound battery cell, the second power unit drives the center needle to move, thereby adjusting the tension of the electrode assembly during winding. This releases the internal stress of the wound battery cell during the winding process, increases the gap between the positive electrode, separator, and negative electrode, and facilitates the penetration of electrolyte during subsequent liquid injection and wetting, ultimately improving the cycle life of the battery.

[0012] 2. The second power unit is a telescopic rod, and it adopts a combination of guide rails and slides to ensure accuracy and ensure that the finished product of the wound battery cell is qualified.

[0013] 3. The motor drives the center needle to move via the conveyor belt, which improves the stability of the equipment operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the device; Figure 2 This is a side view of the device; Figure 3 This is the front view of the device; Figure 4 This is a top view of the device (with the electrode assembly added).

[0015] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0016] The present invention will now be further described with reference to the accompanying drawings. Example

[0017] like Figure 1 — Figure 4As shown, a battery cell winding mechanism in this embodiment includes a center pin 8 for winding the battery cell and a first power unit 4 for driving the center pin 8 to rotate. During winding, the electrode assembly 9 is first wound around the center pin 8 and tightened. Then, the center pin 8 rotates, gradually winding the electrode assembly 9 around the center pin 8 to form a finished battery cell. After winding is complete, the battery cell is removed from the center pin 8. Figure 4 The arrows indicate the feeding direction of the electrode assembly 9. This process is a conventional technique and will not be described in detail in this embodiment. Because the electrode assembly 9 is always under tension during this process, the gaps between the layers of the finished cell will be too small, affecting the penetration of electrolyte in the subsequent electrolyte injection process. Therefore, this embodiment specifically provides a second power unit 2 that can drive the center needle 8 to reciprocate along the feeding direction of the electrode assembly 9. During winding, the center needle 8 can move to the right under the push of the second power unit 2, thereby allowing the tensioned electrode assembly 9 to relax to a certain extent, thus releasing the stress in the core assembly and facilitating subsequent electrolyte injection.

[0018] In this embodiment, to ensure accuracy, the second power unit 2 includes an electric telescopic rod mounted on the base 1, with a telescopic length between 0.01 and 1 mm. The first power unit 4 includes a motor mounted on the fixed base 3, which drives the center needle to rotate via a transmission assembly. The bottom of the fixed base 3 is provided with a guide rail 21, which is connected to the electric telescopic rod. The base 1 is provided with a sliding groove 11 that mates with the guide rail 21. Driven by the electric telescopic rod, the guide rail 21 can move smoothly back and forth within the sliding groove 11, thereby driving the fixed base 3, the first power unit 4, and the center pin 8 to move synchronously. The guide rail 21 and the sliding groove 11 form a guiding assembly, ensuring that the fixed base 3 (as well as the first power unit 4, the transmission assembly, and the center pin 8) moves smoothly and reliably during reciprocating movement.

[0019] The transmission assembly is mounted on the fixed base 3 and includes a drive wheel, a driven wheel connected to the center pin 8, and a belt 5 connecting the two. The drive wheel is mounted on the fixed base 3 and rotates under the drive of a motor. It can also drive the driven wheel and the center pin 8 to rotate via the belt. A connecting plate 6 for mounting the driven wheel is also provided on the fixed base 3.

[0020] When this device is in use, as the electrode assembly 9 is wound on the center needle 8, the electric telescopic rod gradually extends, so that the electrode assembly 9 is no longer in a taut state, thereby creating a certain gap between the layers of the finished chip, which facilitates subsequent liquid injection.

[0021] The above embodiments are not intended to limit the shape, material, structure, etc. of this utility model in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0023] If the terms "first" or "second" are used in this document to define the components, those skilled in the art should know that the use of "first" or "second" is merely for the convenience of describing this utility model and simplifying the description, and unless otherwise stated, the above terms have no special meaning.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell winding mechanism, comprising a center pin and a first power unit for driving the center pin to rotate, wherein an electrode assembly is wound on the center pin to form a battery cell, characterized in that, It also includes a second power unit disposed on the base, the first power unit is mounted on a fixed seat, and a guide assembly is provided between the fixed seat and the base; The second power unit has a movable end for driving the fixed base to reciprocate along the feeding direction of the electrode assembly.

2. The battery cell winding mechanism according to claim 1, characterized in that, The first power unit includes a motor, which drives the center needle to rotate through a transmission assembly; The second power unit includes a telescopic rod, which drives the fixed base, motor, transmission assembly and center pin to move by extending and retracting.

3. A cell winding mechanism according to claim 2, characterized in that, The bottom of the fixed base is provided with a guide rail, which is connected to the telescopic rod, and the base is provided with a sliding groove that cooperates with the guide rail. The guide rail and the slide groove together form a guiding assembly.

4. A cell winding mechanism according to claim 2, characterized in that, The transmission assembly includes a drive wheel connected to the motor, a driven wheel connected to the center pin, and a belt connecting the two.

5. A cell winding mechanism according to claim 4, characterized in that, The driving wheel is mounted on a fixed base, and the fixed base is also provided with a connecting plate for mounting the driven wheel.

Images