Pole piece lithium supplementing mechanism and pole piece winding device
By designing an integrated lithium-ion replenishing mechanism, including lithium-ion unrolling, inserting nip roller, lithium-ion cutting knife and feed nip roller, the problems of manual operation and large equipment volume in the prior art are solved, and the problem of The efficient and automated lithium battery supplementation improves production flexibility and efficiency.
Patent Information
- Application Number
- CN202420398206.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-03-01
AI Technical Summary
The existing lithium battery lithium replenishment mechanism needs to be manually operated during the electrode sheet winding process, and the equipment is large, which affects the layout of the production line, making it difficult to achieve flexible production and efficient lithium replenishment.
A lithium-ion replenishing mechanism is designed, including lithium-ion unrolling, inserting nip roller, lithium-ion cutter and feed nip roller. Through integrated design and linkage control, the lithium-ion sheet is automatically cut and transported, and adapted to different battery designs. Require.
The production flexibility of the lithium lithium supplementation process of the electrode sheet is improved, the impact on the original production equipment is reduced, the space utilization is improved, and the automatic lithium supplementation is achieved, which improves production efficiency.
Smart Images
Figure CN222462937U_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of lithium batteries, and in particular relates to a pole piece lithium replenishing mechanism and a pole piece winding device. Background Art
[0002] During the first charge and discharge process of a lithium-ion battery, a solid electrolyte interface film will be formed on the surface of the electrode and other structures due to the electrochemical reaction of the electrolyte, resulting in irreversible consumption of lithium in the battery, affecting the capacity and energy density of the lithium-ion battery. Therefore, it is usually necessary to replenish lithium in the pole piece during the battery manufacturing process to compensate for this lithium loss in advance and improve the performance of the lithium-ion battery. Using lithium sheets or lithium foils to replenish lithium is one of the commonly used lithium replenishment processes in battery manufacturing. However, the existing lithium replenishment mechanism has low production flexibility, and manual intervention is often required during the winding process of the pole piece. It is difficult to flexibly adjust the position of the lithium sheet insertion and the size of the lithium sheet according to actual production needs; and the automated lithium replenishment mechanism is large in size and has a greater impact on the layout of the original production equipment. Therefore, providing a pole piece lithium replenishment mechanism that adapts to flexible production has a high practical value for improving the production efficiency of lithium batteries. Utility Model Content
[0003] The purpose of the utility model is to provide a pole piece lithium replenishing mechanism, which can improve the production flexibility of the pole piece lithium replenishing process. The utility model also provides a pole piece winding device.
[0004] According to an embodiment of one aspect of the present invention, a pole piece lithium replenishing mechanism is provided, which includes a lithium sheet unwinding, a sheet inserting roller, a lithium sheet cutter and a feeding roller. The lithium sheet unwinding is wound with a lithium sheet, the sheet inserting roller and the feeding roller clamp the lithium sheet and define a feeding channel from the lithium sheet unwinding to the lithium battery pole piece inserting mechanism, so as to allow the lithium sheet to be transported from the lithium sheet unwinding to the lithium battery pole piece inserting mechanism through the feeding channel; the lithium sheet cutter is arranged in the feeding channel for cutting the lithium sheet.
[0005] The device integrates the lithium sheet cutter and the rollers for conveying lithium sheets into an integrated design, and is independently set next to the lithium battery electrode insertion mechanism. It can replenish lithium according to the battery design requirements, improve production flexibility, reduce the impact on the original production equipment, and improve space utilization.
[0006] Furthermore, in some embodiments, the electrode lithium replenishment mechanism further includes a length-counting module, which is connected to the lithium sheet cutter and the lithium sheet unwinding, the sheet inserting roller and the feeding roller signal to control the cutting length of the lithium sheet and the timing of conveying it to the lithium battery electrode sheet inserting mechanism. The electrode lithium replenishment mechanism can provide lithium sheets of different lengths for lithium replenishment according to design requirements, further improving production flexibility.
[0007] Furthermore, in some embodiments, the cutting length of the lithium sheet is not less than the distance between the sheet inserting roller and the feeding roller.
[0008] Furthermore, in some embodiments, the lithium sheet cutter is configured as a pair of vertically arranged blade heads, one side of which is a fixed blade and the other side is a movable blade. The blade of the movable blade has an inclination angle relative to the cross-section of the lithium sheet, so that when the lithium sheet is cut, there is point contact between the lithium sheet cutter and the lithium sheet, thereby ensuring the cutting effect.
[0009] Furthermore, in some embodiments, dust removal mechanisms are provided above and below the lithium sheet cutter, respectively, and the dust removal mechanisms provide negative pressure to collect debris generated during the lithium sheet cutting process.
[0010] Furthermore, in some embodiments, the electrode lithium replenishing mechanism also includes a waste box, the waste box is connected to the dust removal mechanism, and a drying device is provided in the waste box.
[0011] Furthermore, in some embodiments, the electrode lithium replenishing mechanism includes a correction mechanism, which includes a correction sensor and an actuator. The correction sensor is used to detect the offset of the lithium sheet relative to a preset conveying direction, and the actuator allows the lithium sheet to be unwound and one or more clamping rollers on the feeding channel to move axially to correct the offset of the lithium sheet relative to the preset conveying direction.
[0012] According to another embodiment of the present invention, a pole piece winding device is provided, the device comprising a lithium battery pole piece inserting mechanism, a turret and a winding needle, the lithium battery pole piece inserting mechanism is used to convey the lithium battery pole piece to the winding needle, and the lithium battery pole piece inserting mechanism comprises a film-joining roller. Wherein, the pole piece winding device also comprises a pole piece lithium replenishing mechanism, the pole piece lithium replenishing mechanism adopts the pole piece lithium replenishing mechanism provided in any of the aforementioned embodiments, the pole piece lithium replenishing mechanism conveys the lithium sheet cut to a specified length to the upstream of the film-joining roller and joins the lithium battery pole piece into the film-joining roller, so as to allow the film-joining roller to press and connect the lithium sheet and the pole piece together.
[0013] Furthermore, in some embodiments, the electrode winding device includes a lithium replenishment control system, and the lithium replenishment control system is connected to the electrode lithium replenishment mechanism signal to allow the electrode lithium replenishment mechanism to perform a lithium sheet conveying action when the lithium battery electrode of a specified length passes through the film pressing roller.
[0014] Furthermore, in some embodiments, the electrode lithium replenishing mechanism is installed in the gap between the top of the turret and the lithium battery electrode inserting mechanism. Placing the electrode lithium replenishing mechanism in the redundant space of the original equipment can effectively improve the space utilization efficiency of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a structural schematic diagram of a lithium replenishing mechanism for a pole piece in one embodiment;
[0016] Figure 2 Schematic diagram of the structure of a pole piece winding device in one embodiment.
[0017] The meaning of the accompanying symbols: 1-lithium replenishing mechanism; 11-lithium sheet unwinding; 12-sheet inserting roller; 13-lithium sheet cutting knife; 14-feeding roller; 15-lithium sheet; 16-feeding channel; 2-lithium battery electrode sheet inserting mechanism; 21-negative electrode sheet; 22-flying cutter; 23-film pressing roller; 24-positive electrode sheet; 3-turret; 31-winding needle.
[0018] The purpose of the above drawings is to explain the utility model in detail so that those skilled in the art can understand the technical concept of the utility model, but it is not intended to limit the utility model. For the sake of simplicity, the above drawings only schematically illustrate the structure related to the technical features of the utility model, and do not strictly draw the complete structure and all details according to the actual proportion. DETAILED DESCRIPTION
[0019] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The phrase appearing in various locations in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments herein may be combined with other embodiments without causing structural conflicts.
[0021] In the description of this article, unless otherwise clearly specified and limited, the technical terms "installed", "connected", "connected" and the like should be understood in a broad sense, which can be a movable connection, a fixed connection or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.
[0022] In the description of this document, terms indicating orientation or positional relationships, such as "up", "down", "left", "right", "horizontal", "vertical", "height", "length", and "width", are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to have a specific orientation, be installed or operate in a specific orientation, and should not be construed as a limitation on the embodiments in this document.
[0023] In the description of this article, the terms "first", "second" and the like are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary and secondary relationship of the described technical features. In the description of this article, the meaning of "plurality" is at least two.
[0024] The existing lithium battery recharge mechanism has some defects that are difficult to overcome, such as the insertion of lithium materials during the winding process of the pole piece requires manual operation, or the large size of the lithium recharge equipment seriously affects the original production line layout; further, when the lithium battery has different requirements for the amount of lithium recharge, it is difficult to adaptively adjust the size of the lithium sheet to achieve flexible production. This leads to an increase in the cost of the lithium battery recharge process and insufficient efficiency.
[0025] In order to solve the above problems, an embodiment of the present invention provides a lithium replenishing mechanism for a pole piece, the structure of which is as follows: Figure 1 As shown. The lithium replenishment mechanism 1 includes a lithium sheet unwinding 11, a sheet inserting roller 12, a lithium sheet cutter 13 and a feeding roller 14, and a lithium sheet 15 is wound on the lithium sheet unwinding 11. The lithium replenishment mechanism 1 is arranged on the side of the lithium battery pole sheet inserting mechanism 2, and the sheet inserting roller 12 and the feeding roller 14 jointly define a feeding channel 16 from the lithium sheet unwinding 11 to the lithium battery pole sheet inserting mechanism 2. According to the specific length of the feeding channel 16 and the spacing between the lithium sheet unwinding 11, the sheet inserting roller 12 and the feeding roller 14, one or more intermediate rollers 17 can also be arranged, so that the lithium sheet 15 can be transported to the surface of the negative electrode sheet 21 along the feeding channel 16 under the drive of the lithium sheet unwinding 11, the sheet inserting roller 12 and the feeding roller 14, so as to replenish the lithium of the negative electrode sheet 21. The lithium sheet cutter 13 is arranged in the feeding channel 16 for cutting the lithium sheet. In different embodiments, the feeding channel 16 can be configured as a solid channel with a closed structure, or can be an open space for transporting lithium sheets.
[0026] In a preferred embodiment, the lithium replenishing mechanism 1 is provided with a length measuring module (not shown), which associates the actuation of the lithium sheet cutter 13 with the unwinding action of the lithium sheet unwinding 11, the sheet inserting roller 12, the feeding roller 14 and the intermediate roller 17, so that when the lithium sheet 15 is released to a specified length, the lithium sheet cutter 13 performs a cutting action, thereby cutting the lithium sheet 15 to the specified length required by the design. For example, when the lithium battery design requires that the surface of the negative electrode sheet 21 be evenly attached with lithium sheets to supplement lithium, the lithium sheet unwinding 11 unwinds the lithium sheet 15 at a uniform speed, and the lithium sheet cutter 13 performs a cutting action every time the length of the lithium sheet passing through the lithium sheet cutter 13 is equal to each section of the negative electrode sheet 21, so that the cut length of the lithium sheet 15 is the same as the cut length of the negative electrode sheet 21; and when the lithium battery design requires that lithium is supplemented only at the end of the negative electrode sheet, the lithium sheet unwinding 11 is intermittently unwound, and the lithium sheet cutter 13 performs a cutting action every time the length of the lithium sheet 15 passing through the lithium sheet cutter 13 reaches the design requirement, so that the cut length of the lithium sheet 15 is consistent with the length of the end section of the negative electrode sheet. In different embodiments, the linkage mechanism can adopt a mechanical structure, such as a transmission mechanism such as a chain, gears, etc., or a signal-connected electrical control system.
[0027] In a preferred embodiment, the linkage mechanism controls the lithium sheet cutter 13 to perform the cutting action so that the length of the lithium sheet 15 cut is not less than the distance between the insert clamp roller 12 and the feed clamp roller 14 to ensure that the end of the lithium sheet 15 can be clamped by the feed clamp roller 14 before cutting.
[0028] In some embodiments, the lithium sheet cutter 13 is configured as a pair of vertically arranged blades, and the lithium sheet is cut by moving toward each other. One side of the lithium sheet cutter 13 is configured as a moving blade, and the other side is configured as a fixed blade, wherein the blade of the moving blade is configured to have a certain inclination angle relative to the cross section of the lithium sheet 15, so that the contact between the lithium sheet cutter 13 and the lithium sheet 15 is point contact when performing the cutting action, thereby increasing the shear force of the lithium sheet cutter 13 on the lithium sheet 15, thereby improving the cutting efficiency.
[0029] In a preferred embodiment, vacuum dust removal mechanisms (not shown) are respectively provided above and below the lithium sheet cutter 13 to absorb dust and debris generated during the cutting process by providing negative pressure. In a further preferred embodiment, the vacuum dust removal mechanism is connected to a waste box, and a drying device, such as a desiccant or a drying mechanism, is provided in the waste box to keep the waste lithium chips dry and avoid the risk of moisture.
[0030] In a preferred embodiment, the lithium replenishing mechanism 1 is further provided with a correction mechanism (not shown), which is provided with a correction sensor and an actuating mechanism. The correction sensor is used to detect the orientation of the lithium sheet 15, and the actuator can control the lithium sheet unwinding 11 and the clamping rollers in the feeding channel 16 to perform axial translation; when the lithium sheet 15 deviates from the preset conveying direction, the correction sensor can detect its offset, so that the actuator drives one or more of the lithium sheet unwinding 11, the inserting sheet clamping roller 12, the feeding clamping roller 14, and the intermediate roller 17 to perform axial movement to correct the offset of the lithium sheet 15. For example, during the cutting process of the lithium sheet cutter 13, the lithium sheet 15 deflects and generates a deflection angle between the lithium sheet 15 and the conveying direction. According to the measurement result of the correction sensor, when the front end (front side relative to the conveying direction) of the lithium sheet 15 is clamped by the feeding clamping roller 14 and the rear end (rear side relative to the conveying direction) is still clamped by the inserting sheet clamping roller 12, the actuator controls the feeding clamping roller 14 to perform axial movement to correct the angle deflection.
[0031] Another embodiment of the utility model provides a pole piece winding device such as Figure 2 As shown, the winding device includes a lithium battery electrode sheet inserting mechanism 2, a turret 3 and a lithium replenishing mechanism 1. The lithium battery electrode sheet inserting mechanism 2 includes a film pressing roller 23 and a fly cutter 22. The fly cutter 22 is used to cut the negative electrode sheet, and the film pressing roller 23 is used to convey the negative electrode sheet 21 to the winding needle 31 to complete the winding; in addition, a positive electrode sheet inserting mechanism with a basically similar structure is provided for conveying the positive electrode sheet 24, so that the positive electrode sheet 24 and the negative electrode sheet 21 are pressed together at the winding needle 31 (an insulating film layer 25 is provided between the positive electrode sheet 24 and the negative electrode sheet 21 for isolation). The lithium replenishing mechanism 1 cuts the lithium sheet 15 into a specified length, and conveys it to the upstream of the film pressing roller 23 and is sent into the film pressing roller 23 together with the negative electrode sheet 21 to be pressed together, so as to realize the lithium replenishment of the negative electrode sheet 21.
[0032] In a preferred embodiment, the electrode winding device is provided with a lithium replenishment control system (not shown), which can control the lithium replenishment mechanism 1 to perform lithium replenishment when the negative electrode 21 moves to a specified section according to design requirements.
[0033] In a preferred embodiment, the lithium replenishing mechanism 1 is arranged above the turret 3 and installed in the gap between the inclined lithium battery pole piece inserting mechanism 2 and the turret 3, so as to fully utilize the redundant space of the equipment.
[0034] In a preferred embodiment, a Figure 1 The lithium replenishment mechanism 1 shown in FIG. Figure 2 The process of lithium replenishment operation of the pole piece winding device shown is as follows:
[0035] The working cycle starts with the flying cutter 22 performing a cutting operation of the negative electrode sheet 21 once.
[0036] In some embodiments, lithium replenishment is performed by attaching lithium sheets 15 of equal length to the surface of the negative electrode sheet 21. While the negative electrode sheet 21 is conveyed to the film-forming roller 23, the lithium replenishment mechanism 1 performs the lithium replenishment action: the lithium sheet unwinding 11 unwinds the lithium sheet 15, and the sheet inserting roller 12 and the feeding roller 14 convey the lithium sheet 15 to the lithium battery electrode sheet inserting mechanism 2, and the lithium sheet 15 and the negative electrode sheet 21 are synchronously entered into the film-forming roller 23 for compaction; the speed of the lithium sheet unwinding 11 unwinding the lithium sheet 15 is consistent with the conveying speed of the negative electrode sheet 21, and when the negative electrode sheet 21 is conveyed to the specified length, the flying cutter 22 cuts off the negative electrode sheet, and when the length of the lithium sheet 15 passing through the lithium sheet cutter 13 is the same as the specified length of the negative electrode sheet 21, the lithium sheet cutter 13 cuts off the lithium sheet, and completes the full length lithium replenishment of the negative electrode sheet 21. Thus, a working cycle is completed.
[0037] In other embodiments, the negative electrode sheet 21 is only provided with lithium sheets in the tail section for lithium replenishment. When the negative electrode sheet 21 is transported to the film-forming roller and passes through a specified length, the lithium replenishment mechanism 1 performs the lithium replenishment action, the lithium sheet unwinding 11 unwinds the lithium sheet 15, and the lithium sheet 15 is transported by the sheet inserting roller 12 and the feeding roller 14. When the length of the lithium sheet 15 passing through the lithium sheet cutter 13 is the same as the length of the lithium replenishment section required for the negative electrode sheet 21, the lithium sheet cutter 13 cuts the lithium sheet 15, and the feeding roller 14 clamps the lithium sheet 15 and transports it to the surface of the negative electrode sheet 21, so that the lithium sheet 15 and the section of the negative electrode sheet 21 designed with lithium replenishment requirements enter the film-forming roller together with the section to be compacted to complete the lithium replenishment. Thus, a working cycle is completed. During the lithium replenishment process, the lithium replenishment mechanism 1 is intermittently actuated, and the lithium sheet 15 is transported only when the section of the negative electrode sheet 21 that needs lithium replenishment passes.
[0038] During the operation of the lithium replenishing mechanism 1 , the correction sensor of the lithium replenishing mechanism 1 detects the position of the lithium sheet 15 in real time. When the lithium sheet 15 is offset or skewed, the actuating mechanism drives the lithium sheet unwinding 11 , the sheet inserting roller 12 or the feeding roller 14 to move axially to correct the offset or skew of the lithium sheet 15 .
[0039] When the lithium sheet cutter 13 cuts the lithium sheet 15, the vacuum dust removal mechanism arranged above and below the lithium sheet cutter 13 performs vacuum dust collection operation, and collects the debris or dust generated by the cutting of the lithium sheet into the waste box for drying to prevent the lithium chips from getting wet and causing corrosion to the equipment.
[0040] The purpose of the above embodiments is to explain the present invention in detail in conjunction with the accompanying drawings so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the present invention, the optimization or equivalent replacement of the parts and structures involved, as well as the combination of implementation methods in different embodiments without conflict of structure and principle, all fall within the protection scope of the present invention.
Claims
1. A lithium replenishing mechanism for a pole piece, characterized in that: Including lithium sheet unwinding, sheet inserting roller, lithium sheet cutting knife and feeding roller, Among them, a lithium sheet is wound on the lithium sheet unwinding, the sheet inserting clamping roller and the feeding clamping roller clamp the lithium sheet and define a feeding channel from the lithium sheet unwinding to the lithium battery pole sheet inserting mechanism, so as to allow the lithium sheet to be transported from the lithium sheet unwinding to the lithium battery pole sheet inserting mechanism through the feeding channel; the lithium sheet cutter is arranged in the feeding channel for cutting the lithium sheet.
2. The electrode lithium replenishing mechanism according to claim 1, characterized in that: The electrode lithium replenishing mechanism also includes a length measuring module, which is connected to the lithium sheet cutter and the lithium sheet unwinding, the inserting roller and the feeding roller signal to control the cutting length of the lithium sheet and the timing of conveying it to the lithium battery electrode inserting mechanism.
3. The electrode lithium replenishing mechanism according to claim 2, characterized in that: The cutting length of the lithium sheet is not less than the distance between the sheet inserting roller and the feeding roller.
4. The electrode lithium replenishing mechanism according to claim 1, 2 or 3, characterized in that: The lithium sheet cutter is configured as a pair of vertically arranged cutter heads, one side of which is a fixed cutter and the other side is a movable cutter, wherein the blade of the movable cutter has an inclination angle relative to the cross section of the lithium sheet.
5. The electrode lithium replenishing mechanism according to claim 1, 2 or 3, characterized in that: Dust removal mechanisms are respectively arranged above and below the lithium sheet cutter, and the dust removal mechanisms provide negative pressure to collect debris generated during the lithium sheet cutting process.
6. The electrode lithium replenishing mechanism according to claim 5, characterized in that: The electrode lithium replenishing mechanism further comprises a waste box, the waste box is connected to the dust removal mechanism, and a drying device is arranged in the waste box.
7. The electrode lithium replenishing mechanism according to claim 1, 2 or 3, characterized in that: The electrode lithium replenishing mechanism includes a correction mechanism, which includes a correction sensor and an actuator. The correction sensor is used to detect the offset of the lithium sheet relative to a preset conveying direction, and the actuator allows the lithium sheet to be unwound and one or more clamping rollers on the feeding channel to move axially to correct the offset of the lithium sheet relative to the preset conveying direction.
8. A pole piece winding device, comprising a lithium battery pole piece inserting mechanism, a turret and a winding needle, wherein the lithium battery pole piece inserting mechanism is used to convey the lithium battery pole piece to the winding needle, and the lithium battery pole piece inserting mechanism comprises a film pressing roller; characterized in that: The pole piece winding device also includes a pole piece lithium replenishing mechanism, which adopts the pole piece lithium replenishing mechanism as described in any one of claims 1 to 7, and the pole piece lithium replenishing mechanism transports the lithium sheet cut to a specified length to the upstream of the film pressing roller and merges it with the lithium battery pole piece into the film pressing roller, so as to allow the film pressing roller to press and connect the lithium sheet and the pole piece together.
9. The pole piece winding device according to claim 8, characterized in that: The pole piece winding device includes a lithium replenishment control system, which is connected to the pole piece lithium replenishment mechanism signal to allow the pole piece lithium replenishment mechanism to perform a lithium sheet conveying action when the lithium battery pole piece of a specified length passes through the film pressing roller.
10. The pole piece winding device according to claim 8 or 9, characterized in that: The pole piece lithium replenishing mechanism is installed in the gap between the top of the turret and the lithium battery pole piece inserting mechanism, thereby increasing the space utilization of the equipment.