CN-121989489-A - Pre-compression system for reducing strain imbalance of multi-channel electrode

Abstract

Embodiments of the present disclosure relate to a pre-compression system for reducing strain imbalance of a multi-channel electrode. In general, one or more aspects of the present disclosure relate to methods, systems, and devices for prestrained a bare track of a multipass electrode with a system for calendaring the multipass electrode, where the system for calendaring the multipass electrode includes a prestrained roller device including a plurality of prestrained rollers and a pressure roller, the prestrained rollers and the pressure roller forming a prestrained ram, and a calendaring roller device including a pair of calendaring rollers forming a calendaring ram positioned downstream of the prestrained roller device.

Inventors

• S. R.K. Mutu Kumar
• YANG XIAOYUN
• ZHU YAOYAO
• Lv Kezhou

Assignees

• 特斯拉公司

Dates

Publication Date

20260508

Application Date

20251029

Priority Date

20241101

Claims (20)

1. 1. A system for calendaring multiple electrodes, comprising: a pre-strain roller device comprising a plurality of pre-strain rollers and a pressure roller, wherein the plurality of pre-strain rollers and the pressure roller form a pre-strain ram; a calender roll apparatus including a pair of calender rolls forming a calender head positioned downstream of the prestrain roll apparatus, and A multi-pass electrode comprising a plurality of electrode films and a plurality of bare passes positioned within the pre-strained ram and the calendaring ram; Wherein each of the plurality of prestrain rollers is positioned adjacent a portion of one of the plurality of bare tracks, and Wherein the plurality of pre-strained rollers are configured to apply a force to the plurality of bare tracks.
2. 2. A system for calendaring multiple electrodes, comprising: a prestrain roller arrangement comprising a plurality of prestrain rollers and pressure rollers, wherein the plurality of prestrain rollers and the pressure rollers form a prestrain ram, and A calender roll apparatus including a pair of calender rolls forming a calender ram positioned downstream of the prestrain roll apparatus.
3. 3. The system of claim 2, further comprising a multi-pass electrode comprising a plurality of electrode films and a plurality of bare passes positioned within the prestrain ram and the calendaring ram.
4. 4. A system according to claim 2 or 3, further comprising a drive pressure roller in contact with the pressure roller.
5. 5. A system according to claim 2 or3, wherein the plurality of pre-strained rollers are configured to be driven by the pressure roller.
6. 6. The system of claim 2 or 3, wherein the pressure roller is configured to press against the plurality of pre-strained rollers at a pressure of at least about 0.11T/mm.
7. 7. A system according to claim 2 or 3, wherein the calender roll arrangement is configured to provide a pressure of at least about 0.25T/mm.
8. 8. A system according to claim 2 or 3, wherein each of the pair of pre-strained rollers comprises a cylindrical surface positioned tangential to the cylindrical surface of the pressure roller.
9. 9. The system of claim 8, wherein each pre-strained roller of the pair of pre-strained rollers comprises a chamfer at each end of the cylinder surface.
10. 10. A system according to claim 2 or 3, wherein the pair of pre-strained rollers are heated.
11. 11. A system according to claim 2 or 3, wherein the plurality of pre-strained rollers comprise a stainless steel alloy material.
12. 12. A system according to claim 2 or 3, wherein each of the pair of pre-strained rollers comprises a surface coating.
13. 13. A method of fabricating a multi-channel electrode for an energy storage device, comprising: Prestretching and calendaring a multipass electrode comprising a plurality of bare traces and a plurality of electrode films, wherein prestretching and calendaring the multipass electrode comprises straining the plurality of bare traces to form a prestretched multipass electrode, and The prestrained multi-channel electrode is calendered to form a strain balanced multi-channel electrode.
14. 14. The method of claim 13, wherein the multi-channel electrode further comprises a plurality of ceramic coated portions, each ceramic coated portion positioned between each electrode film of the plurality of electrode films and each bare channel of the plurality of bare channels.
15. 15. The method of claim 13, wherein calendaring the pre-strained multi-channel electrode is performed from a first end to a second end of the pre-strained multi-channel electrode.
16. 16. The method of claim 13, wherein the strain balanced multipass electrode comprises a camber of at most about 0.4 cm/m.
17. 17. The method of claim 13, further comprising forming the multi-channel electrode.
18. 18. The method of claim 17, wherein the multi-channel electrode is formed via a wet process.
19. 19. The method of claim 17, wherein the multi-channel electrode is formed via a dry process.
20. 20. A method of forming a plurality of electrodes, comprising: Performing the method according to any one of claims 13 to 19, and Cut along the length of each bare track to form a plurality of electrodes.

Description

Pre-compression system for reducing strain imbalance of multi-channel electrode Incorporation by reference of all priority applications The present application claims priority from U.S. patent application Ser. No.18/935,281, entitled "PRE-CALENDERING SYSTEM FOR REDUCING STRAIN IMBALANCES IN MULTILANE ELECTRODES (Pre-cast System for reducing Strain imbalance in Multi-channel electrodes), filed on 1/11/2024, the entire contents of which are incorporated herein by reference. Technical Field The present invention relates to an apparatus, system and method for calendaring electrodes. More particularly, the present invention relates to prestraining a multipass electrode prior to calendaring the multipass electrode. Background The electrodes may be manufactured using a wet or dry electrode manufacturing process. Conventional wet electrode processes involve mixing the slurry, coating the foil with the slurry, drying the slurry onto the foil, and then calendaring the electrode. Electrodes can also be manufactured using a dry electrode process by calendaring a dry electrode film onto a foil. The calendaring process may be prone to quality problems such as introducing electrode doming and wrinkling. Accordingly, there is a need for an apparatus, system, and method for reducing quality problems in electrode production processes. Disclosure of Invention To summarize the embodiments and their advantages over the prior art, certain objects and advantages of the embodiments are described herein. Not all of these objects or advantages may be achieved in any particular embodiment of the invention. Thus, for example, those skilled in the art will recognize that the design may be embodied or carried out in a manner that achieves or optimizes one advantage or group of advantages as taught herein without necessarily achieving other objects or advantages as may be taught or suggested herein. In some aspects, a system for calendaring multiple electrodes is described. The system includes a pre-strain roller device including a plurality of pre-strain rollers and a pressure roller, wherein the plurality of pre-strain rollers and the pressure roller form a pre-strain ram (nib), and a calender roller device including a pair of calender rollers forming a calender ram positioned downstream of the pre-strain roller device, a plurality of electrodes including a plurality of electrode films and a plurality of bare lanes positioned within the pre-strain ram and the calender ram, wherein each of the plurality of pre-strain rollers is positioned adjacent to a portion of one of the plurality of bare lanes, and the plurality of pre-strain rollers is configured to apply a force to the plurality of bare lanes. In some aspects, a system for calendaring multiple electrodes is described. The system includes a prestrain roller arrangement including a plurality of prestrain rollers and a pressure roller, wherein the plurality of prestrain rollers and the pressure roller form a prestrain ram, and a calender roller arrangement including a pair of calender rollers forming a calender ram positioned downstream of the prestrain roller arrangement. In some embodiments, the system further comprises a multi-channel electrode comprising a plurality of electrode films and a plurality of bare channels positioned within the prestrain ram and the calendaring ram. In some embodiments, the system further comprises a drive pressure roller in contact with the pressure roller. In some embodiments, the plurality of pre-strained rollers are configured to be driven by a pressure roller. In some embodiments, the pressure roller is configured to press against the plurality of pre-strained rollers at a pressure of at least about 0.11T/mm. In some embodiments, the calender roll apparatus is configured to provide a pressure of at least about 0.25T/mm. In some embodiments, each of the pre-strained rollers includes a cylindrical surface positioned tangential to the cylindrical surface of the pressure roller. In some embodiments, each of the pre-strained rollers includes a chamfer at each end of the cylindrical surface. In some embodiments, the pre-strained rollers are heated. In some embodiments, the plurality of pre-strained rollers comprises a stainless steel alloy material. In some embodiments, the pre-strained roller includes a surface coating. In some aspects, a method of manufacturing a multi-channel electrode for an energy storage device is described. The method includes prestrain rolling a multipass electrode including a plurality of bare traces and a plurality of electrode films, wherein prestrain rolling the multipass electrode includes straining the plurality of bare traces to form a prestrain multipass electrode, and rolling the prestrain multipass electrode to form a strain balanced multipass electrode. In some embodiments, the multi-channel electrode further comprises a plurality of ceramic coated portions, each portion positioned between each of the plurality of ele