Head thermal composite winding structure

Abstract

The utility model discloses a head thermal complex winding structure, including and film roller subassembly, thermal complex pressing plate subassembly, winding needle and diaphragm cutting knife, and film roller subassembly and thermal complex pressing plate subassembly are sequentially arranged along the winding direction of winding needle, and thermal complex pressing plate subassembly includes the first thermal complex pressing plate mechanism and the second thermal complex pressing plate mechanism who sets up oppositely, and the first thermal complex pressing plate mechanism includes first support base plate, first thermal complex drive arrangement, first movable plate and first thermal complex pressing plate, and the second thermal complex pressing plate mechanism includes second support base plate, second thermal complex drive arrangement, second movable plate and second thermal complex pressing plate, and diaphragm cutting knife is movably arranged in one side of winding needle, the utility model discloses through the dual effect of superimposed pressure and temperature, realizes winding initial " zero gap ", realizes to eliminate first circle air gap, reduces diaphragm and pole piece redundancy, can from the root cause reduction battery thickness, directly promotes energy density.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, specifically to a head-heated composite winding structure. Background Technology

[0002] The initial stage (the first 3-5 turns) of the lithium-ion battery winding process is crucial in determining the stability and thickness of the cell structure. Currently, the industry faces two major challenges: 1. Uncontrollable initial interlayer gaps: Traditional winding needles create ineffective air gaps due to the initial loose adhesion of the electrode / separator during winding. These gaps are difficult to completely eliminate during subsequent hot pressing, leading to an overall increase in cell thickness. 2. Ineffective increase in thickness during the first turn: Relying on tape to fix the starting end adds extra thickness (≥40μm / layer); or increasing the length of the separator and negative electrode to separate the positive and negative electrodes wastes space. These problems force cell designs to reserve redundant thickness, severely limiting energy density improvements. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a head thermal composite winding structure.

[0004] The technical solution of this utility model is as follows:

[0005] A head-end thermal composite winding structure includes a film-coating roller assembly, a thermal composite pressure plate assembly, a winding needle, and a diaphragm cutter. The film-coating roller assembly and the thermal composite pressure plate assembly are arranged sequentially along the winding direction of the winding needle. The film-coating roller assembly is used to clamp the negative electrode head and the diaphragms on both sides. The thermal composite pressure plate assembly includes a first thermal composite pressure plate mechanism and a second thermal composite pressure plate mechanism arranged opposite to each other. The first thermal composite pressure plate mechanism includes a first support base plate, a first thermal composite driving device, a first movable plate, and a first thermal composite pressure plate. The first thermal composite pressure plate is movably mounted on the first support base plate through the first movable plate. The thermal composite drive device drives the reciprocating movement toward the second thermal composite pressure plate mechanism. The first thermal composite pressure plate is provided with a first heating rod. The second thermal composite pressure plate mechanism includes a second supporting base plate, a second thermal composite drive device, a second movable plate, and a second thermal composite pressure plate. The second thermal composite pressure plate is movably mounted on the second supporting base plate via the second movable plate and is driven by the second thermal composite drive device to reciprocate toward the first thermal composite pressure plate mechanism. The second thermal composite pressure plate is provided with a second heating rod. The diaphragm cutter is movably mounted on one side of the winding needle for cutting the diaphragm.

[0006] Furthermore, the film-coating roller assembly includes a first film-coating roller and a second film-coating roller arranged opposite to each other, and the first film-coating roller and the second film-coating roller are driven to come together to clamp the negative electrode head and the diaphragms on both sides.

[0007] Furthermore, a first temperature sensor is provided on the first thermal composite plate, and a second temperature sensor is provided on the second thermal composite plate.

[0008] Furthermore, the first thermal composite pressure plate is connected to one side of the first movable plate, and a first heat insulation pressure plate is provided between the first thermal composite pressure plate and the first movable plate.

[0009] Furthermore, the first movable plate is provided with a pressure sensor mounting slot, in which a pressure sensor is installed, and the pressure sensing end of the pressure sensor faces the first thermal composite plate.

[0010] Furthermore, two first linear guide rails are arranged opposite each other on the first support base plate, and the first movable plate is movably connected to the two first linear guide rails.

[0011] Furthermore, the second thermal composite pressure plate is connected to one side of the second movable plate, and a second heat insulation pressure plate is provided between the second thermal composite pressure plate and the second movable plate.

[0012] Furthermore, two second linear guide rails are arranged opposite each other on the second support base plate, and the second movable plate is movably connected to the two second linear guide rails.

[0013] Furthermore, the first thermal composite plate extends out of the first supporting base plate, and a fine-tuning mechanism is provided on one side of the first supporting base plate corresponding to the bottom of the first thermal composite plate.

[0014] Furthermore, the pressing surfaces of the first and second thermally composite plates are flat, stepped, or inclined.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model achieves "zero gap" at the initial winding stage by superimposing the dual effects of pressure and temperature, thereby eliminating the air gap in the first turn, reducing the redundancy of the separator and electrode, fundamentally reducing the cell thickness, and directly improving the energy density; in addition, the combination of different thermal composite pressure plate planes can meet the requirements of different usage conditions, greatly improving the compatibility of equipment products and the adaptability of new lithium battery processes, which is of great significance to the development of lithium battery winding technology. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a head thermal composite winding structure provided by this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the thermal composite pressure plate assembly of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] To illustrate the technical solution described in this utility model, specific embodiments are described below.

[0021] Example

[0022] Please see Figure 1 This embodiment provides a head thermal composite winding structure, including a film-coating roller assembly 1, a thermal composite pressure plate assembly 2, a winding needle 3, and a diaphragm cutter 4. The film-coating roller assembly 1 and the thermal composite pressure plate assembly 2 are arranged sequentially along the winding direction of the winding needle 3. The film-coating roller assembly 1 includes a first film-coating roller 11 and a second film-coating roller 12 arranged opposite to each other. By driving the first film-coating roller 11 and the second film-coating roller 12 to move closer and clamp the negative electrode head and the diaphragms on both sides, the thermal composite pressure plate assembly 2 includes a first thermal composite pressure plate mechanism 21 and a second thermal composite pressure plate mechanism 22 arranged opposite to each other. The thermal composite process is completed by driving the first thermal composite pressure plate mechanism 21 and the second thermal composite pressure plate mechanism 22. The diaphragm cutter 4 is movably arranged on one side of the winding needle 3 and is used to cut the diaphragm.

[0023] Combination Figure 2 As shown:

[0024] Specifically, the first thermal bonding pressing plate mechanism 21 includes a first supporting base plate 211, a first thermal bonding driving device 212, a first movable plate 213, and a first thermal bonding pressing plate 214. Two first linear guide rails 215 are arranged opposite each other on the first supporting base plate 211, and these two first linear guide rails 215 are positioned towards the second thermal bonding pressing plate mechanism 22. The first thermal bonding pressing plate 214 is movably mounted on the two first linear guide rails 215 via the first movable plate 213. It is driven by the first thermal bonding driving device 212 to reciprocate towards the second thermal bonding pressing plate mechanism 22, thus performing the thermal bonding process in conjunction with the first thermal bonding pressing plate mechanism 21. The first thermal bonding driving device 212 can be a cylinder or similar device. The first thermal bonding pressing plate 214 is connected to one side of the first movable plate and extends out of the first supporting base plate 211. A fine-tuning mechanism is provided on one side of the first supporting base plate 211 corresponding to the bottom of the first thermal bonding pressing plate 214. 216. The parallelism between the two thermal bonding plates on both sides of the film-coating roller assembly 1 is adjusted by the fine-tuning mechanism 216, so that the electrode sheet and the diaphragm are subjected to uniform force and are tightly bonded. A first heating rod 217 is provided in the first thermal bonding plate 214, which heats the material during thermal bonding. A first temperature sensor 218 is provided on the first thermal bonding plate 214, which can monitor the temperature of the first thermal bonding plate 214 in real time. A first heat insulation plate 219 is provided between the first thermal bonding plate 214 and the first movable plate 213, which can isolate the heat transfer of the first thermal bonding plate, thereby protecting the rear structure. A pressure sensor mounting slot is provided in the first movable plate 213, and a pressure sensor 210 is provided in the pressure sensor mounting slot, with the pressure sensing end of the pressure sensor 210 facing the first thermal bonding plate 214, so that the thermal bonding pressure can be monitored in real time by the pressure sensor 210.

[0025] Specifically, the second thermal bonding platen mechanism 22 includes a second supporting base plate 221, a second thermal bonding drive device 222, a second movable plate 223, and a second thermal bonding platen 224. Two second linear guide rails 225 are arranged opposite each other on the second supporting base plate 221, and these two linear guide rails 225 are positioned towards the first thermal bonding platen mechanism 21. The second thermal bonding platen 224 is movably mounted on the two second linear guide rails 225 via the second movable plate 223. Driven by the second thermal bonding drive device 222, it reciprocates towards the first thermal bonding platen mechanism 21, thus cooperating with the second thermal bonding platen mechanism 22 to perform the thermal bonding process. The second thermal composite drive device 222 can be a cylinder or the like; the second thermal composite pressure plate 224 is connected to one side of the second movable plate 223, and a second heating rod 226 is provided in the second thermal composite pressure plate 224. During thermal composite, heating is achieved through the second heating rod 226; a second temperature sensor 227 is provided on the second thermal composite pressure plate 224, which can monitor the temperature of the second thermal composite pressure plate 224 in real time; a second heat insulation pressure plate 228 is provided between the second thermal composite pressure plate 224 and the second movable plate 223. The second heat insulation pressure plate 228 can isolate the heat transfer of the second thermal composite pressure plate, thereby protecting the rear structure.

[0026] The pressing surfaces of the first thermal composite plate 214 and the second thermal composite plate 224 can be made of soft materials such as silicone, Teflon, and polyurethane, or hard materials such as metal. Silicone hard materials can be used for a long time in high-temperature environments and have the characteristics of not deforming, expanding, or melting, and also have high elasticity and wear resistance. Teflon hard materials have excellent wear resistance and pressure resistance, and can effectively reduce the deformation of materials under high temperature or pressure and maintain stability. Polyurethane hard materials have excellent thermal insulation performance and durability, and also have moisture-proof and waterproof functions.

[0027] Among them, the pressing surfaces of the first thermal composite pressing plate 214 and the second thermal composite pressing plate 224 can be irregular surfaces such as planes, stepped surfaces, and inclined surfaces. Different combinations can be obtained by selecting different pressing surfaces. The combination of different thermal composite pressing plate planes can meet the requirements of different usage conditions, greatly improving the compatibility of equipment products and the adaptability of new lithium battery processes, which is of great significance to the development of lithium battery winding process.

[0028] Its workflow is as follows:

[0029] 1. Once the separator of the previous battery cell is cut, the large tray is flipped to the new winding station;

[0030] 2. The negative electrode head is inserted into the hot press plate pressing position below the film-coating roller;

[0031] 3. The first film-coating roller 11 and the second film-coating roller 12 come together to clamp the negative electrode head and the diaphragms on both sides;

[0032] 4. The first thermal bonding plate 214 and the second thermal bonding plate 224 extend out, press the negative electrode head and the diaphragm tightly, and exhaust the air gap between the electrode and the diaphragm as much as possible. The first heating rod 217 and the second heating rod 226 heat the thermal bonding plate and maintain the temperature for head thermal bonding, so that the diaphragm softens under heat and adheres to the surface of the electrode, reducing the interlayer air gap. The first temperature sensor 218 and the second temperature sensor 227 monitor the temperature change in real time.

[0033] 5. The first thermal composite platen 214 and the second thermal composite platen 224 retract, and the first film-coating roller 11 and the second film-coating roller 12 open;

[0034] 6. The positive electrode is inserted into place / the adhesive pin pulls the separator and negative electrode into place;

[0035] 7. The diaphragm cutter 4 cuts the diaphragm;

[0036] 8. 3. Normal winding / finishing of the coiling needle.

[0037] This head-mounted thermal composite winding structure achieves "zero gap" at the initial winding stage by superimposing the effects of pressure and temperature, thereby eliminating the air gap in the first turn, reducing redundancy in the diaphragm and electrode, fundamentally reducing cell thickness, and directly improving energy density.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A head-mounted thermal composite winding structure, characterized in that: The assembly includes a film-coating roller assembly, a thermal bonding plate assembly, a winding needle, and a diaphragm cutter. The film-coating roller assembly and the thermal bonding plate assembly are arranged sequentially along the winding direction of the winding needle. The film-coating roller assembly is used to clamp the negative electrode head and the diaphragms on both sides. The thermal bonding plate assembly includes a first thermal bonding plate mechanism and a second thermal bonding plate mechanism arranged opposite to each other. The first thermal bonding plate mechanism includes a first supporting base plate, a first thermal bonding drive device, a first movable plate, and a first thermal bonding plate. The first thermal bonding plate is movably mounted on the first supporting base plate through the first movable plate and driven by the first thermal bonding drive device. The first thermal composite pressure plate is driven to reciprocate in the direction of the second thermal composite pressure plate mechanism. The first thermal composite pressure plate is provided with a first heating rod. The second thermal composite pressure plate mechanism includes a second supporting base plate, a second thermal composite driving device, a second movable plate, and a second thermal composite pressure plate. The second thermal composite pressure plate is movably mounted on the second supporting base plate via the second movable plate and is driven to reciprocate in the direction of the first thermal composite pressure plate mechanism via the second thermal composite driving device. The second thermal composite pressure plate is provided with a second heating rod. The diaphragm cutter is movably mounted on one side of the winding needle for cutting the diaphragm.

2. The head thermal composite winding structure according to claim 1, characterized in that: The film-coating roller assembly includes a first film-coating roller and a second film-coating roller arranged opposite to each other. The first film-coating roller and the second film-coating roller are driven to move closer together and clamp the negative electrode head and the diaphragms on both sides.

3. The head thermal composite winding structure according to claim 1, characterized in that: A first temperature sensor is provided on the first thermal composite plate, and a second temperature sensor is provided on the second thermal composite plate.

4. The head thermal composite winding structure according to claim 1, characterized in that: The first thermal composite pressure plate is connected to one side of the first movable plate, and a first heat insulation pressure plate is provided between the first thermal composite pressure plate and the first movable plate.

5. The head thermal composite winding structure according to claim 4, characterized in that: The first movable plate is provided with a pressure sensor mounting slot, and a pressure sensor is provided in the pressure sensor mounting slot, with the pressure sensing end of the pressure sensor facing the first thermal composite plate.

6. The head thermal composite winding structure according to claim 1, characterized in that: Two first linear guide rails are arranged opposite each other on the first support base plate, and the first movable plate is movably connected to the two first linear guide rails.

7. The head thermal composite winding structure according to claim 1, characterized in that: The second thermal composite pressure plate is connected to one side of the second movable plate, and a second heat insulation pressure plate is provided between the second thermal composite pressure plate and the second movable plate.

8. The head thermal composite winding structure according to claim 1, characterized in that: The second support base plate is provided with two second linear guide rails, and the second movable plate is movably connected to the two second linear guide rails.

9. The head thermal composite winding structure according to claim 1, characterized in that: The first thermal composite plate extends out of the first supporting base plate, and a fine-tuning mechanism is provided on one side of the first supporting base plate corresponding to the bottom of the first thermal composite plate.

10. The head thermal composite winding structure according to claim 1, characterized in that: The pressing surfaces of the first and second thermally composite plates are flat, stepped, or inclined.

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