A diaphragm core-pulling device and a winding device including the diaphragm.

Abstract

This utility model relates to a diaphragm core-pulling device, comprising: an outer needle fixedly disposed at the end of a winding needle in a winding mechanism, the outer needle having a heating channel; an inner needle fixedly disposed within the heating channel, the end of the inner needle abutting against the end of the winding needle; and a heat-conducting needle operably entering the heating channel until the end of the heat-conducting needle abuts against the end of the inner needle, or the heat-conducting needle operably exiting the heating channel. This utility model, by setting a heating mechanism at the adhesive application station, allows the diaphragm to be rapidly heated and cured, significantly improving the diaphragm's peel resistance. Furthermore, when the winding needle is pulled out at the unloading station, the diaphragm is no longer pulled along, reducing the core-pulling defect rate.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery winding equipment, and in particular to a separator core-pulling device and a winding device including the separator. Background Technology

[0002] In the winding process of cylindrical lithium-ion batteries, equipment generally employs a circular winding needle structure. During winding, the separator is first pre-wound onto the surface of the winding needle under tension, followed by the positive and negative electrode sheets, ultimately forming the core. However, when the winding needle is pulled out from the center hole of the core at the unloading station, it often pulls out the separator near the center hole along with it, a phenomenon commonly known as "core pulling." This not only leads to the scrapping of the core but also exacerbates the wear of the winding needle due to the peeling off of the ceramic coating, and in severe cases, can even cause needle breakage or shaft jamming. Therefore, how to effectively prevent separator core pulling without sacrificing winding efficiency remains a pressing technical challenge in this field. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a diaphragm core-pulling device and a winding device including the diaphragm.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The first aspect of this utility model is to provide a diaphragm core-pulling device, comprising:

[0006] The outer needle is fixedly disposed at the end of the winding needle of the winding mechanism. A heating channel is provided on the outer needle, and the heating channel connects the winding needle with the external environment.

[0007] The inner needle is fixedly disposed within the heating channel, and the end of the inner needle abuts against the end of the coiled needle.

[0008] A heating mechanism, comprising: a heating device, a heat-conducting needle, and a driving device;

[0009] The heating device is used to heat the heat-conducting needle, and the driving device is used to drive the heat-conducting needle; the heat-conducting needle can be operably inserted into the heating channel until the end of the heat-conducting needle abuts against the end of the inner needle, or the heat-conducting needle can be operably withdrawn from the heating channel.

[0010] Preferably, the end of the coiled needle is provided with a heating groove, and the end of the inner needle is embedded in the heating groove.

[0011] Preferably, the heating mechanism further includes a fixing device, wherein the heating mechanism is fixed by the fixing device.

[0012] Preferably, the fixing device includes a fixing block, and the heating device and the driving device are all fixedly disposed on the fixing block.

[0013] Preferably, the heating mechanism further includes a temperature control device for monitoring the temperature of the heat-conducting needle when the heating device heats it.

[0014] Preferably, the heat-conducting needle includes: a needle body and a needle body fixing block;

[0015] The needle body is heated by the heating device and can be operatively inserted into or removed from the heating channel; the needle body fixing block is driven by the driving mechanism through a floating joint.

[0016] Preferably, the driving device is a cylinder driving device.

[0017] The second aspect of this utility model is to provide a winding device, including: the diaphragm core-pulling device as described above.

[0018] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0019] This invention improves the diaphragm's peel strength by setting a heating mechanism at the adhesive application station, which allows the diaphragm to be rapidly heated and cured. This also reduces the core-pulling defect rate by preventing the diaphragm from being pulled away when the winding needle is removed at the unloading station. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the diaphragm core-pulling device in this utility model;

[0021] Figure 2 This is a schematic diagram of the winding device in this utility model;

[0022] The reference numerals in the figures include:

[0023] Winding mechanism 0; heating tank 01; outer needle 11; inner needle 12; heating channel 111; heating device 2; heat-conducting needle 3; needle body 31; needle body fixing block 32; driving device 4; fixing block 5; fixing plate 61; turntable 62; outer needle fixing mechanism 63. Detailed Implementation

[0024] The specific embodiments of this utility model will be described in detail below.

[0025] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0026] The word "comprising" or similar terms used in this utility model patent application specification and claims mean that the objects preceding "comprising" include the objects listed after "comprising" or their equivalents, and do not exclude other objects.

[0027] Example 1

[0028] like Figure 1 As shown, this embodiment provides a diaphragm core-pulling device, including:

[0029] The winding mechanism 0 has a heating groove 01 at the end of the winding needle;

[0030] An outer needle 11 is fixedly disposed at the end of the coiled needle. A heating channel 111 is provided on the outer needle 11, and the heating channel 111 connects the heating trough 01 with the external environment.

[0031] Inner needle 12, the inner needle 12 is fixedly disposed in the heating channel 111, and the end of the inner needle 12 is embedded in the heating groove 01;

[0032] The heating mechanism includes: a fixing device (not fully shown in the figure), a heating device 2, a temperature control device, a heat-conducting needle 3, and a driving device 4.

[0033] The fixing device is used to fix the heating mechanism, the heating device 2 is used to heat the heat-conducting needle 3, the driving device 4 is used to drive the heat-conducting needle 3, and the temperature control device is used to monitor the temperature of the heat-conducting needle 3 when the heating device 2 heats the heat-conducting needle 3.

[0034] The fixing device includes a fixing block 5, and the heating device 2 and the driving device 4 are all fixedly mounted on the fixing block 5.

[0035] The heat-conducting needle 3 can be operably inserted into the heating channel 111 until the end of the heat-conducting needle 3 abuts against the end of the inner needle 12, or the heat-conducting needle 3 can be operably withdrawn from the heating channel 111.

[0036] In a preferred embodiment, the driving device 4 is a cylinder driving device.

[0037] In a preferred embodiment, the heat-conducting needle 3 includes: a needle body 31 and a needle body fixing block 32;

[0038] The needle body 31 is heated by the heating device 2 and can be operably entered or exited from the heating channel 111; the needle body fixing block 32 is connected to the driving mechanism 4 through the floating joint 41 and is thus driven by the driving mechanism 4.

[0039] Example 2

[0040] like Figure 2 As shown, this embodiment provides a winding device, including:

[0041] Fixing plate 61;

[0042] Turntable 62, which is rotatably mounted on the fixed plate 61;

[0043] An external needle fixing mechanism 63 is fixedly disposed in the middle of the turntable 62;

[0044] The diaphragm core-pulling device as described in Example 1

[0045] Among them, several winding mechanisms 0 are arranged in a rotationally symmetrical manner on the turntable 62, and the end of the winding needle of each winding mechanism 0 is fixedly provided with the outer needle 11, which is fixedly provided on the outer needle fixing mechanism 63.

[0046] The heating mechanism is provided at one of the winding mechanisms 0. The heating mechanism is fixed to the fixing plate 61 by the fixing device. The two adopt a separate heat conduction structure, which is suitable for direct modification of the existing winding device.

[0047] In a preferred embodiment, the winding mechanism is provided in three units, which are respectively set as a winding station, an adhesive application station, and a material unloading station, and the heating mechanism is provided at the adhesive application station.

[0048] When in use, the winding mechanism is at the winding station, and the diaphragm is pre-wound to the surface of the winding needle under tension, and then the positive and negative electrode sheets are wound in.

[0049] Turntable 62 rotates 120°, and winding mechanism 0 rotates to the adhesive application station. During adhesive application, heating device 2 heats heat-conducting needle 3. When the temperature control device monitors that the temperature of heat-conducting needle 3 reaches the preset temperature, cylinder drive device 4 pushes the needle body fixing block 32 of heat-conducting needle 3 to move heat-conducting needle 3 closer to the winding needle. The needle body 31 of heat-conducting needle 3 enters the heating channel 111 and abuts against the end of inner needle 12. Heat is transferred to the diaphragm in sequence through the needle body 31, inner needle 12, and winding needle, so that the diaphragm is rapidly heated and cured, improving the peel strength of the diaphragm. After adhesive application, cylinder drive device 4 pulls the needle body fixing block 32 of heat-conducting needle 3 to move heat-conducting needle 3 away from the winding needle, and the needle body 31 of heat-conducting needle 3 exits the heating channel 111.

[0050] Turntable 62 rotates 120°, winding mechanism 0 rotates to the unloading station, and the winding needle is pulled away from the center of the core. At this time, the diaphragm is no longer driven, and the core pulling defect rate is reduced.

[0051] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A diaphragm core-pulling device, characterized in that, include: The outer needle (11) is fixedly disposed at the end of the winding needle of the winding mechanism (0). A heating channel (111) is provided on the outer needle (11), and the heating channel (111) connects the winding needle with the external environment. Inner needle (12), the inner needle (12) is fixedly disposed in the heating channel (111), and the end of the inner needle (12) abuts against the end of the coiled needle; The heating mechanism includes: a heating device (2), a heat-conducting needle (3), and a driving device (4); The heating device (2) is used to heat the heat-conducting needle (3), and the driving device (4) is used to drive the heat-conducting needle (3); the heat-conducting needle (3) is operably inserted into the heating channel (111) until the end of the heat-conducting needle (3) abuts against the end of the inner needle (12), or the heat-conducting needle (3) is operably withdrawn from the heating channel (111).

2. The diaphragm core-pulling device according to claim 1, characterized in that, The end of the coiled needle is provided with a heating groove (01), and the end of the inner needle (12) is embedded in the heating groove (01).

3. The diaphragm core-pulling device according to claim 1, characterized in that, The heating mechanism further includes a fixing device, through which the heating mechanism is fixed.

4. The diaphragm core-pulling device according to claim 3, characterized in that, The fixing device includes a fixing block (5), and the heating device (2) and the driving device (4) are all fixedly disposed on the fixing block (5).

5. The diaphragm core-pulling device according to claim 1, characterized in that, The heating mechanism further includes a temperature control device, which is used to monitor the temperature of the heating device (2) when it heats the heat-conducting needle (3).

6. The diaphragm core-pulling device according to claim 1, characterized in that, The heat-conducting needle (3) includes: Needle body (31) and needle body fixing block (32); The needle body (31) is heated by the heating device (2) and can be operably entered or exited from the heating channel (111); the needle body fixing block (32) is driven by the driving device (4) through the floating joint (41).

7. The diaphragm core-pulling device according to claim 1, characterized in that, The drive device (4) is a cylinder drive device.

8. A winding device, characterized in that, include: The diaphragm core-pulling device as described in any one of claims 1-7.

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