Lithium battery winding needle
By designing a grooving and straight-line pushing mechanism for lithium battery coiling pins, the problems of cell inner ring collapse and wrinkling were solved, achieving the effects of simplifying pin insertion operation and improving yield.
Patent Information
- Application Number
- CN202420247470.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-02-01
AI Technical Summary
In the current lithium battery winding process, the inner ring of the cell is prone to collapse and wrinkles, which makes it difficult to insert pins, increases production costs, and results in a low yield rate.
Design a lithium battery coil needle with a detachable needle holder, a cutting groove and a linear pushing mechanism. The inner diameter of the insert cavity is larger than the insert needle. The linear pushing mechanism pushes out the insert needle simultaneously during needle retraction, simplifying the insert needle operation.
It reduces the difficulty of pin insertion, improves the yield rate of lithium batteries, simplifies the production process, and reduces production costs.
Smart Images
Figure CN222338330U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery production, in particular to a lithium battery winding needle. Background Art
[0002] The winding process of cylindrical lithium-ion battery cells is to wind the positive and negative pole pieces of the battery and the separator between them together at a very small distance through winding equipment. This process is the guarantee for achieving high volume energy density of the battery. High volume energy density can carry more energy in a limited space, making it possible to use the battery in large quantities in vehicle power supplies, UPS power supplies, and power tools. After the battery cell is wound, the winding needle is pulled out. During the cycle of the battery, the inner circle of the battery cell is prone to collapse and wrinkles, which affects the battery life and safety. For this reason, the existing battery cell will be set up with a pin insertion process after winding. The difficulty of post-insertion is relatively large and it is easy to cause product defects, which not only increases the difficulty of insertion and production costs, but also easily reduces the yield rate. Utility Model Content
[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a lithium battery pin winding device with a reasonable structural design, which is convenient for pre-setting the pins, helps to reduce the difficulty of pin insertion, and improves the yield rate.
[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0005] A lithium battery winding needle, characterized in that it includes a winding needle that is generally tubular, one end of the winding needle is detachably mounted on a needle seat, and the other end has a groove extending along the length direction, and the groove is arranged along the tangent direction of the inner hole of the winding needle; the end of the winding needle away from the needle seat has a pin cavity for accommodating an insertion pin, the inner diameter of the pin cavity is larger than the diameter of the insertion pin, and the length matches the length of the insertion pin; the end of the pin cavity facing the needle seat has a linear pushing mechanism arranged axially toward the pin cavity.
[0006] With the above structure, during winding, the pin is inserted into the winding needle, and the electrode or diaphragm enters the winding needle from the cutting groove, so that the winding needle can drive the electrode or diaphragm to be wound. After the winding is completed, during the needle withdrawal process, the pin is pushed out synchronously by the linear pushing mechanism, thereby completing the pin insertion operation without the need for subsequent hole expansion and hole calibration operations, greatly improving efficiency and ensuring the yield rate.
[0007] Furthermore, the cutting groove is arranged to penetrate along the tangent direction of the inner hole of the winding needle.
[0008] Furthermore, the linear pushing mechanism includes a guide sleeve that is relatively slidably arranged in the winding needle, and the guide sleeve is connected to a push rod extending toward the pin insertion cavity, and the other end of the push rod extends outward to the distal end and is fixedly arranged.
[0009] After winding, the winding needle will move backward to realize the needle withdrawal. In the above structure, one end of the push rod is fixed, and when the winding needle is wound, the guide sleeve and the winding needle can slide relative to each other. When the winding needle is withdrawn, the push rod will move in the opposite direction relative to the winding needle to achieve the effect of linear pushing.
[0010] Furthermore, the guide sleeve comprises a sliding sleeve which is axially slidably fitted in the winding needle, and the push rod is rotatably mounted in the sliding sleeve via a bearing.
[0011] Furthermore, one end of the push rod facing the pin cavity has a coaxially arranged threaded hole, and is threadedly connected to a coaxially arranged push rod.
[0012] In this way, for battery cells of different lengths, the push rod can be taken out first, and the length of the push rod can be adjusted to change the length of the pin cavity so that the appropriate pin can be inserted.
[0013] In summary, the utility model has the advantages of reasonable structural design, convenient pre-setting of pins, reduced difficulty in pin insertion, and improved yield rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 Schematic diagram of the overall structure of the winding needle in this embodiment.
[0015] Figure 2 This is a schematic diagram of the end face structure of the winding needle. DETAILED DESCRIPTION
[0016] The utility model is further described in detail below in conjunction with the embodiments.
[0017] When implementing: Figure 1 and Figure 2 As shown, a lithium battery winding needle comprises a winding needle 1 which is tubular as a whole, one end of the winding needle 1 is detachably mounted on a needle seat 2, and the other end has a cutting groove 3 extending along the length direction, and the cutting groove 3 is penetrated along the tangent direction of the inner hole of the winding needle 1; the end of the winding needle 1 away from the needle seat 2 has a pin cavity 5 for accommodating a pin, the inner diameter of the pin cavity 5 is larger than the diameter of the pin, and the length matches the length of the pin; the end of the pin cavity facing the needle seat 2 has a linear pushing mechanism 4 arranged axially toward the pin cavity.
[0018] The linear pushing mechanism 4 includes a guide sleeve 41 that can be relatively slidably arranged in the winding needle 1, and a push rod 42 extending toward the pin insertion cavity 5 is connected to the guide sleeve 41, and the other end of the push rod 42 extends outward to the distal end and is fixedly arranged. In this embodiment, the guide sleeve 41 is slidably fitted in the winding needle 1. In specific implementation, the guide sleeve 41 can also be configured to include a sliding sleeve that can be axially slidably fitted in the winding needle 1, and the push rod 42 is rotatably installed in the sliding sleeve through a bearing.
[0019] The push rod 42 has a coaxially arranged threaded hole at one end facing the pin cavity 5 and is threadedly connected to a coaxially arranged push rod 43 .
[0020] With the above structure, before winding, the length of the push rod is adjusted by the thread according to the length of the battery cell to be wound, and the length of the pin cavity is changed to put in the appropriate pin. When winding, the pin is inserted into the winding pin, and the pole piece or diaphragm enters the winding pin from the cut groove, so that the winding pin can drive the pole piece or diaphragm to be wound. After winding, during the needle withdrawal process, the pin is pushed out synchronously by the linear pushing mechanism, thereby completing the pin insertion operation, without the need for subsequent hole expansion and hole calibration operations, greatly improving efficiency and ensuring the yield rate.
[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A lithium battery winding needle, characterized in that: The invention comprises a winding needle (1) which is tubular as a whole, wherein one end of the winding needle (1) is detachably mounted on a needle seat (2), and the other end has a slot (3) extending in the length direction, wherein the slot (3) is arranged in the tangent direction of the inner hole of the winding needle (1); the end of the winding needle (1) which is away from the needle seat (2) has a pin insertion cavity (5) for accommodating a pin, wherein the inner diameter of the pin insertion cavity (5) is greater than the diameter of the pin, and the length matches the length of the pin; the end of the pin insertion cavity which faces the needle seat (2) has a linear pushing mechanism (4) arranged axially toward the pin insertion cavity.
2. The lithium battery winding needle according to claim 1, characterized in that: The cutting groove (3) is arranged to penetrate along the tangent direction of the inner hole of the winding needle (1).
3. The lithium battery winding needle according to claim 1, characterized in that: The linear pushing mechanism (4) comprises a guide sleeve (41) which is relatively slidably arranged in the winding needle (1), and a push rod (42) extending toward the needle insertion cavity (5) is connected to the guide sleeve (41), and the other end of the push rod (42) extends outward to a distal end and is fixedly arranged.
4. The lithium battery winding needle according to claim 3, characterized in that: The guide sleeve (41) comprises a sliding sleeve which is axially slidably fitted in the winding needle (1), and the push rod (42) is rotatably mounted in the sliding sleeve via a bearing.
5. The lithium battery winding needle according to claim 3, characterized in that: One end of the push rod (42) facing the pin cavity (5) has a coaxially arranged threaded hole, and is threadedly connected to a coaxially arranged push rod (43).