Pole piece surface crushing prevention device suitable for lamination process
By using a soft press and an independent controller in the lithium-ion battery stacking process, the damage caused by uneven electrode thickness was solved, achieving soft contact and progressive pressure control, thus ensuring the quality and safety of the stacking process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-05-22
AI Technical Summary
In the lithium-ion battery stacking process, uneven electrode thickness can cause the edges and sharp corners of the pressure strip to easily damage the electrode, posing a potential quality hazard.
A soft press body is combined with a pressure bar and pressed onto the electrode through soft contact. The soft press body with multiple density gradients and an independent controller are designed to monitor and adjust the pressure in real time, and a shearing element is set to prevent overload.
It effectively avoids damage to the electrode surface, ensures interface quality during the stacking process, avoids abnormal problems caused by uneven thickness, and achieves progressive pressure control and overload protection.
Smart Images
Figure CN224266988U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrode stacking technology, specifically to an electrode surface anti-pressure damage device suitable for the stacking process. Background Technology
[0002] The stacking process of lithium-ion batteries eliminates the "C-corner" gap of the winding process through a layered structure, resulting in a denser electrode arrangement, higher space utilization, and a significantly higher volumetric energy density than the winding process. Since the positive and negative electrodes need to be stacked together, the electrodes must be positioned during the manufacturing process, and a certain amount of pressure must be applied to prevent displacement. Although the electrode thickness meets the process requirements during the initial coating and rolling stages, it still exhibits a gradient distribution (higher in the middle and lower at the edges) after die-cutting, meaning the end furthest from the tab is thicker and the end closer to the tab is thinner.
[0003] At present, the stacking process uses a non-deformable rectangular pressure strip to apply a certain pressure to both ends of the electrode to prevent the electrode from shifting during stacking. However, due to the inconsistent thickness of the electrode, the surface of the thicker end is easily damaged, especially the four sides and sharp corners of the pressure strip, which can easily damage the electrode and lead to certain quality problems in the cell. For example, Chinese invention patent application with publication number CN109888185A. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an anti-pressure damage device for electrode surfaces in the lamination process. It changes the original hard contact to soft contact, thus preventing the edges and sharp corners of the pressure strip from pressing on the electrode and causing damage.
[0005] To solve the above-mentioned technical problems, this utility model provides an electrode surface anti-pressure damage device suitable for the stacking process, including a lifting mechanism and a pressure bar. One end of the pressure bar is connected to the lifting mechanism, and the other end of the pressure bar is provided with a soft pressing body. The pressure bar presses onto the electrode through the soft pressing body, and the lifting mechanism is used to drive the pressure bar to press onto the electrode.
[0006] In some embodiments, the soft pressing body includes multiple layers of pressing body units, each layer of pressing body units having a different density, with the density of pressing body units closer to the pressing strip being greater than the density of pressing body units farther from the pressing strip.
[0007] In some embodiments, the soft pressure body is fixed to the other end of the pressure strip by wrapping it.
[0008] In some embodiments, the soft press body is fixed to the surface of the electrode sheet pressed by the press bar.
[0009] In some embodiments, the soft press body comprises elastic silicone.
[0010] In some embodiments, a plurality of independent controllers are included, each of which is connected to a corresponding lifting mechanism. A pressure sensor is disposed on the surface of the pressure bar pressing against the electrode sheet. The pressure sensor is arranged between the pressure bar and the soft pressure body. The pressure sensor is connected to the independent controller, and the independent controller controls the lifting mechanism according to the pressure measured by the pressure sensor.
[0011] In some embodiments, a mounting groove is formed on the surface of the pressure bar pressing against the electrode, the pressure sensor is installed in the mounting groove, a wiring hole is formed in the pressure bar, the wiring hole communicates with the mounting groove, and the independent controller is connected to the pressure sensor through a wire in the wiring hole.
[0012] In some embodiments, the output end of the lifting mechanism is provided with a mounting base, one end of the pressure bar is rotatably connected to the mounting base, and a shearing member is provided on the mounting base. One end of the shearing member cooperates with the pressure bar to restrict the rotation of the pressure bar.
[0013] In some embodiments, the mounting base has a through hole, one end of the pressure strip has a blind hole, and one end of the shearing member is inserted into the blind hole through the through hole, thereby restricting the rotation of the pressure strip.
[0014] In some embodiments, a weak region is provided on the shearing member, such that the point where the shearing member is cut is located in the weak region.
[0015] The beneficial effects of this utility model are as follows:
[0016] 1. This utility model uses a soft pressing body to press the pressing strip onto the electrode sheet, so that the pressing strip and the electrode sheet do not come into contact. This changes the original hard contact to soft contact, avoiding damage to the electrode sheet caused by the edges and sharp corners of the pressing strip pressing on it. Moreover, this solution does not require any changes to the structure of the existing pressing strip. The soft pressing body can be directly bonded to the pressing strip with glass glue.
[0017] 2. The soft pressing body of this utility model is designed as a multi-layer structure, and each layer has a different density, forming a gradient deformation structure. The outermost layer has the lowest density, which can provide initial buffer. The middle layer can balance deformation and rebound. The innermost layer can ensure the stable connection between the soft pressing body and the pressing strip, and make the pressure gradually increase when the pressing strip presses onto the electrode, avoiding instantaneous pressure overload on the electrode surface.
[0018] 3. The soft pressing body of this utility model can be set only on one side of the pressing strip, or it can completely wrap one end of the pressing strip, and the forms are diverse.
[0019] 4. This utility model uses multiple independent controllers to individually control the pressure of each pressure bar, which can effectively improve the problem of abnormal interface quality during stacking caused by uneven electrode thickness.
[0020] 5. This utility model can reduce the overall thickness by opening an installation groove on the surface of the pressure strip to meet the thickness requirements.
[0021] 6. This utility model provides a shearing component on the mounting base. When the pressure applied by the pressure bar to the electrode exceeds a threshold, the shearing component can be cut off. Since the pressure bar is rotatably connected to the mounting base, the pressure of the pressure bar on the electrode is instantly reduced after the shearing component is cut off. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the pressure strip of this utility model being pressed onto the electrode sheet;
[0023] Figure 2 This is an isometric view of the pressure strip of this utility model;
[0024] Figure 3 This is a schematic diagram of the structure of the soft press body of this utility model;
[0025] Figure 4 This is a schematic diagram of the connection structure between the mounting base and the pressure strip of this utility model;
[0026] Figure 5 This is a front view of the mounting base of this utility model;
[0027] Figure 6 This is a top view of the mounting base of this utility model;
[0028] Figure 7 This is a front view of the shearing component of this utility model;
[0029] Figure 8 This is a left view of the shearing component of this utility model.
[0030] Reference numerals: 1-Lifting mechanism; 2-Pressure strip; 21-Blind hole; 3-Soft pressure body; 31-Pressure body unit; 4-Mounting base; 41-Mounting groove; 42-Perforation; 43-Cleaning port; 5-Shearing component; 51-V-groove. Detailed Implementation
[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0032] like Figure 1As shown, this utility model provides an anti-pressure damage device for electrode surfaces suitable for lamination processes, including a lifting mechanism 1 and a pressure strip 2, one end of which is connected to the lifting mechanism 1, as shown. Figure 2 As shown, a soft pressing body 3 is provided at the other end of the pressing strip 2. The pressing strip 2 is pressed onto the electrode sheet by the soft pressing body 3. The lifting mechanism 1 is used to drive the pressing strip 2 to press onto the electrode sheet. Figure 1 The diagram illustrates the situation where two pressure strips 2 are pressed onto the electrode sheet.
[0033] Among them, the lifting mechanism 1 is the prior art. The lifting mechanism 1 can be a combination of a motor and a worm gear reducer. One end of the worm is connected to the pressure bar 2, thereby controlling the slow and stable lifting of the pressure bar 2.
[0034] Understandably, by setting up the soft pressing body 3, the pressing strip 2 is pressed onto the electrode sheet through the soft pressing body 3, and the pressing strip 2 does not contact the electrode sheet. The original hard contact is changed to soft contact, which avoids the edges and sharp corners of the pressing strip 2 pressing onto the electrode sheet and causing damage to the electrode sheet. Moreover, this solution does not require any changes to the structure of the existing pressing strip 2. The soft pressing body 3 can be directly glued to the pressing strip 2 with glass glue.
[0035] In some embodiments, such as Figure 3 As shown, the soft pressing body 3 includes multiple pressing body units 31. Each pressing body unit 31 has a different density. The density of the pressing body unit 31 closer to the pressing strip 2 is greater than the density of the pressing body unit 31 farther away from the pressing strip 2. That is, the density of the pressing body unit 31 gradually decreases from the inside to the outside.
[0036] Understandably, the pressing unit 31 furthest from the pressing strip 2 has a lower density and is a low-density layer. When the pressing strip 2 presses against the electrode, it can provide initial buffer. The pressing unit 31 in the middle has a moderate density and is a support layer. When the pressing strip 2 presses against the electrode, it can provide sufficient elasticity. The pressing unit 31 closest to the pressing strip 2 has a higher density and is a fixing layer. It can ensure a stable connection between the soft pressing body 3 and the pressing strip 2. The multi-layer pressing unit 31 forms a multi-density gradient structure, so that when the pressing strip 2 presses against the electrode, the pressure increases gradually, which can avoid instantaneous overload on the electrode surface.
[0037] In addition, the soft pressing body 3 can also be a one-piece molded structure, and its density varies linearly or non-linearly, with the density increasing closer to the pressing strip 2.
[0038] There are various arrangements of the soft pressing body 3, as long as the pressing strip 2 is pressed onto the electrode sheet by the soft pressing body 3. In some embodiments, the soft pressing body 3 is fixed to the other end of the pressing strip 2 by wrapping it. In other embodiments, the soft pressing body 3 is fixed to the surface of the pressing strip 2 that is pressed onto the electrode sheet, such as... Figure 2 As shown.
[0039] In some embodiments, the soft press body 3 comprises elastic silicone.
[0040] In some embodiments, the electrode surface anti-pressure damage device for the stacking process includes multiple independent controllers, each of which is connected to a corresponding lifting mechanism 1. A pressure sensor is provided on the surface of the electrode where the pressure bar 2 is pressed against it. The pressure sensor is arranged between the pressure bar 2 and the soft pressing body 3. The pressure sensor is connected to the independent controller, and the independent controller controls the lifting mechanism 1 according to the pressure measured by the pressure sensor.
[0041] Understandably, by using multiple independent controllers to individually control the pressure of each pressure bar 2, the problem of abnormal interface quality caused by uneven electrode thickness during stacking can be effectively improved. Furthermore, the independent controllers can acquire the pressure measured by the pressure sensor in real time. When the pressure is too high, the independent controllers can control the lifting mechanism 1 to reduce the pressure of the pressure bar 2 on the electrode.
[0042] Because this utility model adds a pressure sensor and a soft pressing body 3 to the pressure strip 2, the pressure strip 2 becomes thicker overall. If the pressure strip 2 has a thickness requirement, an installation groove 41 can be opened on the surface of the pressure strip 2 that is pressed against the electrode sheet. The pressure sensor is installed in the installation groove 41. A wiring hole is opened in the pressure strip 2 and the wiring hole is connected to the installation groove 41. An independent controller is connected to the pressure sensor through the wire in the wiring hole.
[0043] Alternatively, the lower surface of the pressure strip 2 near one end can be thinned so that after the pressure sensor and the soft pressure body 3 are installed, the thickness of the part where the pressure sensor and the soft pressure body 3 are installed is equal to the thickness of the part where they are not thinned. At this time, the length of the pressure strip 2 extending above the electrode should be strictly controlled so that when the pressure strip 2 is pressed down, only the part where the pressure sensor and the soft pressure body 3 are installed is pressed on the electrode.
[0044] To prevent damage to the electrodes due to malfunction of the independent controller or pressure sensor, such as Figure 1 , 4 As shown, in some embodiments, the output end of the lifting mechanism 1 is provided with a mounting base 4, one end of the pressure bar 2 is rotatably connected to the mounting base 4, and a shearing member 5 is provided on the mounting base 4. One end of the shearing member 5 cooperates with the pressure bar 2 to restrict the rotation of the pressure bar 2.
[0045] It is understandable that by setting a shearing element 5 on the mounting base 4, when the pressure applied by the pressure bar 2 to the electrode sheet is greater than the threshold, the shearing element 5 can be cut off. Since the pressure bar 2 is rotatably connected to the mounting base 4, the pressure of the pressure bar 2 on the electrode sheet is instantly reduced after the shearing element 5 is cut off.
[0046] like Figures 4 to 6As shown, in some embodiments, the mounting base 4 has a mounting groove 41, and a rotating shaft is provided in the mounting groove 41. One end of the pressure strip 2 is rotatably connected to the mounting base 4 through the rotating shaft. The mounting base 4 has a through hole 42, one end of which is connected to the mounting groove 41. One end of the pressure strip 2 has a blind hole 21. When the pressure strip 2 is horizontal, the blind hole 21 and the through hole 42 are coaxial. One end of the shearing piece 5 is inserted into the blind hole 21 through the through hole 42, thereby restricting the rotation of the pressure strip 2.
[0047] It is understandable that, such as Figure 4 As shown, due to the insertion of the shearing element 5, after the pressure strip 2 presses against the electrode, the pressure strip 2 cannot rotate clockwise. When the force on the shearing element 5 exceeds the threshold, the shearing element 5 is cut off, allowing the pressure strip 2 to rotate clockwise, thus no longer applying pressure to the electrode. In addition, the blind hole 21 and the through hole 42 can be arranged at an angle so that the shearing element 5 will not fall out after insertion.
[0048] In some embodiments, a weak region is provided on the shearing member 5, such that the point where the shearing member 5 is cut is located in the weak region, such as... Figure 7 As shown, the weak area can be the V-shaped groove 51 opened on the upper surface of the shearing member 5.
[0049] It is understandable that by setting a weak area, the position where the shearing piece 5 is cut is fixed, thus avoiding interference with the rotation of the pressure strip 2 after the shearing piece 5 is cut.
[0050] In some embodiments, such as Figure 4 , 5 As shown, a cleaning port 43 is provided on the mounting base 4. The cleaning port 43 is connected to the mounting groove 41, so that the cut shearing piece 5 that falls into the mounting groove 41 can be recovered through the cleaning port 43.
[0051] In some embodiments, the cross-sectional shapes of the shearing element 5, the through hole 42, and the blind hole 21 are all the same, namely semi-circular. Figure 5 , 8 As shown, this ensures that after the shearing piece 5 is inserted into the perforation 42 and the blind hole 21, its weak area always faces upwards, thus ensuring that the shearing threshold of the shearing piece 5 remains unchanged and avoiding interference with the pressure strip 2 after shearing.
[0052] The method of using this electrode surface anti-pressure damage device applicable to the lamination process is as follows:
[0053] The shearing element 5 is inserted into the perforation 42 and blind hole 21 beforehand. The operator determines the stacking pressure parameters on the main control panel. Multiple independent controllers drive the corresponding pressure strips 2 downwards. Upon approaching the electrode, the elastic soft pressure body 3 first contacts the electrode surface. Then, the pressure sensor collects the pressure parameters and feeds them back to the independent controllers. When the pressure reaches the set pressure parameter, the independent controllers control the pressure strips 2 to stop moving downwards, completing the predetermined task. If the pressure sensor, independent controller, or lifting mechanism 1 malfunctions, causing the pressure strips 2 to continue moving downwards, the shearing element 5 will be cut when the force on it exceeds a threshold, allowing the pressure strips 2 to rotate freely and thus no longer apply pressure to the electrode, preventing damage to the electrode.
[0054] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A device for preventing pressure damage to electrode surfaces in a lamination process, characterized in that: It includes a lifting mechanism (1) and a pressure bar (2). One end of the pressure bar (2) is connected to the lifting mechanism (1), and the other end of the pressure bar (2) is provided with a soft pressure body (3). The pressure bar (2) is pressed onto the electrode through the soft pressure body (3). The lifting mechanism (1) is used to drive the pressure bar (2) to press onto the electrode.
2. The electrode surface anti-pressure damage device applicable to the stacking process according to claim 1, characterized in that: The soft press body (3) includes multiple press body units (31), each press body unit (31) has a different density, and the density of the press body unit (31) closer to the press bar (2) is greater than the density of the press body unit (31) farther away from the press bar (2).
3. The electrode surface anti-pressure damage device applicable to the stacking process according to claim 2, characterized in that: The soft press body (3) is fixed to the other end of the press strip (2) by wrapping.
4. The electrode surface anti-pressure damage device suitable for stacking process according to claim 2, characterized in that: The soft press (3) is fixed to the surface of the electrode sheet pressed by the press strip (2).
5. The electrode surface anti-pressure damage device according to any one of claims 1 to 4, characterized in that: The soft press (3) includes elastic silicone.
6. The electrode surface anti-pressure damage device according to any one of claims 1 to 4, characterized in that: It includes multiple independent controllers, each of which is connected to a corresponding lifting mechanism (1). A pressure sensor is provided on the surface of the pressure bar (2) pressing against the electrode sheet. The pressure sensor is arranged between the pressure bar (2) and the soft pressure body (3). The pressure sensor is connected to the independent controller. The independent controller controls the lifting mechanism (1) according to the pressure measured by the pressure sensor.
7. The electrode surface anti-pressure damage device suitable for stacking process according to claim 6, characterized in that: The pressure strip (2) presses against the surface of the electrode sheet and forms an installation groove (41). The pressure sensor is installed in the installation groove (41). A wiring hole is formed in the pressure strip (2) and communicates with the installation groove (41). The independent controller is connected to the pressure sensor through the wire in the wiring hole.
8. The electrode surface anti-pressure damage device according to any one of claims 1 to 4, characterized in that: The output end of the lifting mechanism (1) is provided with a mounting base (4), one end of the pressure bar (2) is rotatably connected to the mounting base (4), and a shearing member (5) is provided on the mounting base (4). One end of the shearing member (5) cooperates with the pressure bar (2) to restrict the rotation of the pressure bar (2).
9. The electrode surface anti-pressure damage device suitable for stacking process according to claim 8, characterized in that: A through hole (42) is provided on the mounting base (4), and a blind hole (21) is provided at one end of the pressure strip (2). One end of the shearing member (5) is inserted into the blind hole (21) through the through hole (42), thereby restricting the rotation of the pressure strip (2).
10. The electrode surface anti-pressure damage device suitable for stacking process according to claim 8, characterized in that: A weak area is provided on the shearing member (5) so that the point where the shearing member (5) is cut is located in the weak area.