Lithium supplementing device, pole piece production device and lithium battery production line
By combining lithium belts and conveyor rollers, continuous electrochemical lithium replenishment of the negative electrode sheet is achieved by utilizing the difference in electrode polarity, which solves the problem of difficulty in continuous lithium replenishment in existing technologies and improves the safety and efficiency of production.
Patent Information
- Application Number
- CN202510980028.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-16
- Publication Date
- 2025-11-11
AI Technical Summary
Existing electrochemical lithium replenishment processes are not easy to achieve continuous lithium replenishment, and the actual production process is difficult and poses significant safety risks.
A combination of lithium belt and conveyor rollers is used. The lithium belt, which includes copper foil and metallic lithium, is continuously conveyed in the electrolyte tank. Electrochemical lithium replenishment is performed by combining the difference in electrode polarity, so as to achieve continuous and uninterrupted lithium replenishment of the negative electrode sheet.
It improves the efficiency of electrochemical lithium replenishment, reduces the difficulty of operation and safety risks, and achieves efficient and stable lithium replenishment of the negative electrode.
Smart Images
Figure CN120933299A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a lithium replenishment device, an electrode production device, and a lithium battery production line. Background Technology
[0002] Lithium-ion batteries primarily rely on the movement of lithium ions between the positive and negative electrodes to achieve charging and discharging. Lithium loss during charging and discharging is a significant factor affecting battery energy and cycle performance. During the first charge, the formation of a solid electrolyte film consumes some lithium, leading to lithium loss in the positive electrode material, reduced battery capacity, and ultimately, a decrease in initial efficiency. To mitigate this irreversible capacity reduction during the first charge, lithium coating is applied to the electrode surface using a lithium replenishment device.
[0003] Currently, the most common method for lithium replenishment on negative electrodes is electrochemical lithium replenishment. This method involves ionizing lithium ions and then attaching them to the negative electrode in the electrolyte through an electric field. The lithium ions then gain electrons to form lithium metal. This method has significant advantages over other lithium replenishment methods, such as precise control of the replenishment amount and ensuring uniformity. In current electrochemical lithium replenishment schemes, lithium blocks or plates are typically used as the lithium source, a key material for replenishment. However, since lithium blocks or plates require frequent replacement during the replenishment process, continuous lithium replenishment is difficult to achieve in electrochemical lithium replenishment processes, resulting in high operational difficulty and significant safety risks in actual production. Summary of the Invention
[0004] This application provides a lithium replenishment device, an electrode production device, and a lithium battery production line to solve the problems of difficulty in achieving continuous lithium replenishment, high operational difficulty, and high safety risks in existing electrochemical lithium replenishment processes.
[0005] In a first aspect, embodiments of this application provide a lithium replenishment device, comprising:
[0006] A lithium strip, comprising a copper foil and metallic lithium, wherein the metallic lithium is disposed on the surface of the copper foil;
[0007] An electrolyte tank for containing electrolyte, wherein at least a portion of the lithium strip is located in the electrolyte tank;
[0008] A conveyor roller for conveying the lithium strip and / or negative electrode sheet.
[0009] In one possible implementation, the lithium strip is negatively charged, and the negative electrode is positively charged.
[0010] In one possible implementation, the conveying roller includes:
[0011] Lithium belt roller, the lithium belt conveyor roller being used to convey lithium belt;
[0012] A negative electrode roller, used to transport the negative electrode sheet.
[0013] In one possible implementation, the lithium belt roller is negatively charged, and the negative electrode roller is positively charged.
[0014] In one possible implementation, the lithium strip roller includes: a lithium strip unwinding roller, a lithium strip replenishing roller, and a lithium strip take-up roller. The lithium strip unwinding roller and the lithium strip take-up roller are located outside the electrolyte and are used to unwind and rewind the lithium strip. The lithium strip replenishing roller is immersed in the electrolyte and is used to ensure that the conveying path of the lithium strip passes through the electrolyte.
[0015] In one possible implementation, the negative electrode roller includes a negative electrode unwinding roller, a negative electrode lithium replenishing roller, and a negative electrode take-up roller. The negative electrode unwinding roller and the negative electrode take-up roller are located outside the electrolyte and are used to unwind and rewind the negative electrode sheet. The negative electrode lithium replenishing roller is immersed in the electrolyte and is used to ensure that the conveying path of the negative electrode sheet passes through the electrolyte.
[0016] In one possible implementation, a lithium strip replenishing roller is provided directly above and below the negative electrode replenishing roller, with the diameter of the upper conveying roller being smaller than that of the lower conveying roller.
[0017] In one possible implementation, the diameters of adjacent conveyor rollers located within the electrolyte differ by twenty centimeters.
[0018] In one possible implementation, the negative electrode roller further includes a negative electrode transition roller, which is disposed between the negative electrode unwinding roller and the negative electrode replenishing roller and / or the negative electrode transition roller is disposed between two negative electrode replenishing rollers and / or the negative electrode transition roller is disposed between the negative electrode replenishing roller and the negative electrode unwinding roller. The lithium strip roller further includes a lithium strip transition roller, which is disposed between the lithium strip unwinding roller and the lithium strip replenishing roller and / or the lithium strip transition roller is disposed between two lithium strip replenishing rollers and / or the lithium strip transition roller is disposed between the lithium strip replenishing roller and the lithium strip take-up roller.
[0019] In one possible implementation, the lithium strip roller includes one lithium strip unwinding roller, one lithium strip take-up roller, four lithium strip replenishing rollers, and five lithium strip transition rollers; the negative electrode roller includes one negative electrode unwinding roller, one negative electrode take-up roller, four negative electrode replenishing rollers, and five negative electrode transition rollers.
[0020] Secondly, this application provides an electrode production apparatus, including the lithium replenishment device described in any one of the first aspects.
[0021] Thirdly, this application provides a lithium battery production line, including the lithium replenishment device described in any one of the first aspects and the electrode production device described in the second aspect.
[0022] The lithium replenishment device, electrode production device, and lithium battery production line provided in this application embodiment perform electrochemical lithium replenishment on the negative electrode sheet by setting up a lithium strip, an electrolyte tank, and a conveying roller. The lithium strip includes copper foil and metallic lithium, with metallic lithium disposed on the surface of the copper foil. The conveying roller can continuously transport the negative electrode sheet and the lithium strip to the electrolyte tank, so that during the electrochemical lithium replenishment process of the negative electrode sheet, lithium can be continuously and uninterruptedly replenished in the electrolyte tank. Compared with using lithium blocks and lithium plates as lithium sources, this method can improve the efficiency of electrochemical lithium replenishment and solve the problems of difficulty in achieving continuous lithium replenishment, high operational difficulty and high safety risks in actual production in existing electrochemical lithium replenishment processes. Attached Figure Description
[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0024] Figure 1 This is a schematic diagram of a lithium replenishment device.
[0025] Figure label:
[0026] 1-Lithium strip, 2-Negative electrode sheet, 3-Electrolyte tank, 4-Electrolyte, 51-Lithium strip unwinding roller, 52-Lithium strip replenishing roller, 53-Lithium strip take-up roller, 54-Lithium strip transition roller, 61-Negative electrode unwinding roller, 62-Negative electrode replenishing roller, 63-Negative electrode take-up roller, 64-Negative electrode transition roller.
[0027] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation
[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0030] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying 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, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0032] As mentioned in the background section, in current electrochemical lithium replenishment processes, lithium blocks or plates are typically used as the key lithium source in various electrochemical lithium replenishment solutions. Lithium blocks and plates need to undergo an electrochemical reaction in the electrolyte to replenish lithium to the negative electrode. However, lithium blocks and plates lose their own lithium material during the electrochemical lithium replenishment process. Therefore, it is necessary to constantly replace the lithium blocks and plates in the electrolyte during electrochemical lithium replenishment. However, replacing lithium blocks and plates leads to low efficiency in electrochemical lithium replenishment, and manual replacement is more likely to cause safety problems.
[0033] To avoid the aforementioned problems, this application provides a lithium replenishment device, comprising: a lithium strip comprising copper foil and metallic lithium, with the metallic lithium disposed on the surface of the copper foil; an electrolyte tank for containing electrolyte, with at least a portion of the lithium strip located within the electrolyte tank; and a conveying roller for conveying the lithium strip and / or the negative electrode sheet. By setting up the lithium strip, electrolyte tank, and conveying roller, electrochemical lithium replenishment is performed on the negative electrode sheet. The conveying roller continuously transports the negative electrode sheet and lithium strip to the electrolyte tank, enabling continuous and uninterrupted lithium replenishment during the electrochemical lithium replenishment process on the negative electrode sheet. Compared to using lithium blocks and plates as lithium sources, this method improves the efficiency of electrochemical lithium replenishment and solves the problems of difficulty in achieving continuous lithium replenishment, high operational difficulty in actual production, and significant safety risks in existing electrochemical lithium replenishment processes.
[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.
[0035] This application provides a lithium replenishment device, as shown in the figure. The lithium replenishment device includes: a lithium strip, which includes copper foil and metallic lithium, with the metallic lithium disposed on the surface of the copper foil; an electrolyte tank, which contains electrolyte, with at least a portion of the lithium strip located in the electrolyte tank; and a conveying roller, which conveys the lithium strip and / or the negative electrode sheet.
[0036] For example, the lithium strip is negatively charged, and the negative electrode is positively charged. This scheme improves lithium replenishment efficiency by using the potential difference to promote lithium ion migration through setting the electrode polarities of the lithium strip and the negative electrode. In some embodiments, the lithium strip roller is negatively charged, and the negative electrode roller is positively charged. This scheme further enhances the directional migration of lithium ions and reduces energy loss through the electrode setting of the conveyor roller.
[0037] For example, the conveyor rollers include a lithium strip roller and a negative electrode roller. The lithium strip roller is used to convey the lithium strip, and the negative electrode roller is used to convey the negative electrode sheet. This solution achieves independent control of the lithium strip and the negative electrode sheet through a separate conveyor structure, avoiding mutual interference.
[0038] For example, the lithium strip roller is negatively charged, and the negative electrode roller is positively charged. This scheme introduces negative charge into the lithium strip by charging the lithium strip roller negatively, and positive charge into the negative electrode sheet by charging the negative electrode sheet negatively. During the lithium replenishment process, the negatively charged lithium strip and the positively charged negative electrode sheet facilitate the ionization of the lithium strip and the deposition of metallic lithium on the negative electrode surface, significantly improving the efficiency of the electrochemical lithium replenishment process. For example, the lithium strip roller includes a lithium strip unwinding roller, a lithium strip replenishment roller, and a lithium strip take-up roller. The unwinding and take-up rollers are located outside the electrolyte, while the lithium strip replenishment roller is immersed in the electrolyte. This scheme, by setting up the lithium strip unwinding roller, lithium strip replenishment roller, and lithium strip take-up roller, adjusts the lithium strip conveying path, further optimizing the lithium strip conveying structure.
[0039] For example, the negative electrode roller includes a negative electrode unwinding roller, a negative electrode lithium replenishment roller, and a negative electrode take-up roller. The negative electrode unwinding roller and the negative electrode take-up roller are located outside the electrolyte, while the negative electrode lithium replenishment roller is immersed in the electrolyte. This solution, by setting up the negative electrode unwinding roller, the negative electrode lithium replenishment roller, and the negative electrode take-up roller, adjusts the conveying path of the negative electrode sheet, further optimizing the negative electrode sheet conveying structure.
[0040] For example, a lithium strip replenishing roller is disposed directly above and below the negative electrode replenishing roller, and the diameter of the negative electrode replenishing roller is smaller than that of the lithium strip replenishing roller. This scheme optimizes the lithium ion migration path by creating an interleaved structure between the lithium strip and the replenishment area of the negative electrode sheet through differentiated diameter design.
[0041] For example, the diameters of adjacent conveyor rollers located within the electrolyte differ by 20 centimeters. This 20-centimeter diameter difference between adjacent conveyor rollers means that the distance between the negative electrode plate in the middle and the lithium strip on both sides is 10 centimeters, allowing both sides of the negative electrode plate to face the lithium strip, thus enabling electrochemical lithium replenishment on both sides of the negative electrode plate.
[0042] For example, the negative electrode roller further includes a negative electrode transition roller, which is disposed between the negative electrode unwinding roller and the negative electrode lithium replenishment roller, between two negative electrode lithium replenishment rollers, or between the negative electrode lithium replenishment roller and the negative electrode take-up roller; the lithium strip roller further includes a lithium strip transition roller, which is disposed between the lithium strip unwinding roller and the lithium strip lithium replenishment roller, between two lithium strip lithium replenishment rollers, or between the lithium strip lithium replenishment roller and the lithium strip take-up roller. The conveying path of the lithium strip and the electrode sheet is optimized by the negative electrode transition roller and the lithium strip transition roller, and the tension and length of the lithium strip and the electrode sheet can be adjusted by adjusting the negative electrode transition roller and the lithium strip transition roller.
[0043] For example, the lithium strip roller includes one lithium strip unwinding roller, one lithium strip take-up roller, four lithium strip replenishing rollers, and five lithium strip transition rollers; the negative electrode roller includes one negative electrode unwinding roller, one negative electrode take-up roller, four negative electrode replenishing rollers, and five negative electrode transition rollers. This solution achieves continuous and stable conveying of lithium strip and negative electrode sheets through multi-roller collaborative design, meeting the requirements of high-efficiency production.
[0044] This application also provides an electrode production apparatus, which includes the aforementioned lithium replenishment device. In some embodiments, this electrode production apparatus integrates a lithium replenishment function to achieve seamless integration between the pre-lithiation of the negative electrode and subsequent processes, thereby improving overall production efficiency.
[0045] This application also provides a lithium battery production line, which includes the aforementioned lithium replenishment device and / or electrode production device. In some embodiments, this lithium battery production line incorporates the lithium replenishment process into the battery manufacturing process through a modular design, significantly improving battery energy density and production efficiency.
[0046] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.
Claims
1. A lithium replenishment device for electrochemically replenishing lithium to a negative electrode, characterized in that, include: A lithium strip, comprising a copper foil and metallic lithium, wherein the metallic lithium is disposed on the surface of the copper foil; An electrolyte tank for containing electrolyte, wherein at least a portion of the lithium strip is located in the electrolyte tank; A conveyor roller for conveying the lithium strip and / or the negative electrode sheet.
2. The lithium replenishment device according to claim 1, characterized in that, The lithium strip carries a negative charge, and the negative electrode plate carries a positive charge.
3. The lithium replenishment device according to claim 1, characterized in that, The conveying roller includes: Lithium belt roller, the lithium belt conveyor roller being used to convey lithium belt; A negative electrode roller, used to transport the negative electrode sheet.
4. The lithium replenishment device according to claim 3, characterized in that, The lithium belt roller is negatively charged, and the negative electrode roller is positively charged.
5. The lithium replenishment device according to claim 4, characterized in that, The lithium strip roller includes: a lithium strip unwinding roller, a lithium strip replenishing roller, and a lithium strip take-up roller. The lithium strip unwinding roller and the lithium strip take-up roller are located outside the electrolyte and are used to unwind and rewind the lithium strip. The lithium strip replenishing roller is immersed in the electrolyte and is used to ensure that the lithium strip's conveying path passes through the electrolyte.
6. The lithium replenishment device according to claim 4 or claim 5, characterized in that, The negative electrode roller includes a negative electrode unwinding roller, a negative electrode lithium replenishing roller, and a negative electrode take-up roller. The negative electrode unwinding roller and the negative electrode take-up roller are located outside the electrolyte and are used to unwind and rewind the negative electrode sheet. The negative electrode lithium replenishing roller is immersed in the electrolyte and is used to ensure that the conveying path of the negative electrode sheet passes through the electrolyte.
7. The lithium replenishment device according to claim 6, characterized in that, The lithium strip replenishing roller is provided directly above and below the negative electrode replenishing roller, and the diameter of the upper conveying roller is smaller than that of the lower conveying roller.
8. The lithium replenishment device according to claim 7, characterized in that, Located within the electrolyte, the diameters of adjacent conveying rollers differ by twenty centimeters.
9. The lithium replenishment device according to claim 8, characterized in that, The negative electrode roller further includes a negative electrode transition roller, which is disposed between the negative electrode unwinding roller and the negative electrode lithium replenishment roller and / or the negative electrode transition roller is disposed between two negative electrode lithium replenishment rollers and / or the negative electrode transition roller is disposed between the negative electrode lithium replenishment roller and the negative electrode unwinding roller. The lithium strip roller further includes a lithium strip transition roller, which is disposed between the lithium strip unwinding roller and the lithium strip lithium replenishment roller and / or the lithium strip transition roller is disposed between two lithium strip lithium replenishment rollers and / or the lithium strip transition roller is disposed between the lithium strip lithium replenishment roller and the lithium strip take-up roller.
10. The lithium replenishment device according to claim 9, characterized in that, The lithium strip roller includes one lithium strip unwinding roller, one lithium strip take-up roller, four lithium strip replenishing rollers, and five lithium strip transition rollers; the negative electrode roller includes one negative electrode unwinding roller, one negative electrode take-up roller, four negative electrode replenishing rollers, and five negative electrode transition rollers.
11. An electrode production apparatus, characterized in that, Includes the lithium replenishment device according to any one of claims 1-10.
12. A lithium battery production line, characterized in that, Includes the lithium replenishment device according to any one of claims 1-10 or the electrode production device according to claim 11.