A lithium battery pole plate slitting device

Abstract

The utility model discloses a lithium battery polar plate slitting device, include: slitting knife mechanism is used for cutting open the tab area on the polar plate along the polar plate movement direction, including the knife rest and blade, the blade is installed on the knife rest, the rolling mechanism is used for rolling the polar plate, the machine table is used for installing slitting knife mechanism and rolling mechanism, the polar plate first passes through the slitting knife mechanism and cuts open the tab area, and then enters the rolling mechanism and rolls. The lithium battery polar plate slitting device provided by the utility model is cut through the slitting knife mechanism before the polar plate passes through the rolling mechanism, cuts open the tab area on the polar plate along the polar plate movement direction, makes the position release pressure of the tab area on the polar plate, thereby avoids when entering the rolling mechanism and rolling, and the tab area can not contact with the rolling wheel and is wrinkled because of the thickness less than the material area, influences the polar plate use.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production, and in particular to a lithium battery electrode plate cutting device. Background Technology

[0002] With the increasing application of lithium-ion batteries, lithium-ion stacked batteries, due to their high energy density and high power density, are widely used in various electronic devices. In the manufacturing process of lithium-ion stacked batteries, positive electrode sheets, negative electrode sheets, and separators are stacked in a specific order and then fixed together by hot pressing to form the core of the battery. To improve efficiency and design convenience, the positive electrode plate is designed in a zebra shape. A rolling mill, under double-roll pressure, compacts the coating on the positive electrode sheet, effectively controlling its thickness. After rolling, the electrode structure is stable, and the gaps and spacing between particles gradually decrease, shortening the ion transport distance. On the positive electrode sheet, the coating is only located in the material area, while the thickness of the tab area is less than that of the material area. Therefore, during the rolling process, the material area contacts the rollers while the tab area does not. The different forces cause wavy wrinkles at the interface between the material area and the tab. Tab wrinkling not only affects the appearance but can also lead to material detachment, bulging, and cracking, affecting the cell quality. Utility Model Content

[0003] The purpose of this utility model is to provide a lithium battery electrode plate cutting device. By setting a cutting blade mechanism in front of the rolling mechanism to cut the tab area on the electrode plate, the stress on the tab area is released in advance, so that the edge of the material area will not wrinkle when the electrode plate is rolled.

[0004] To solve the above technical problems, the following technical solution is adopted: This utility model provides a lithium battery electrode plate cutting device, comprising: A slitting mechanism is used to cut the tab area on the electrode plate along the electrode plate moving direction, and includes a blade holder and a blade, wherein the blade is mounted on the blade holder; A rolling mechanism for rolling an electrode plate includes an upper rolling wheel and a lower rolling wheel, wherein the electrode plate is located between the upper rolling wheel and the lower rolling wheel; The machine base is used to install the slitting and crushing mechanisms; The electrode plate is first cut open in the tab area by the cutting blade mechanism, and then it enters the rolling mechanism for rolling.

[0005] Optionally, the tool holder is arranged perpendicular to the electrode plate, and both ends of the tool holder are mounted on the machine base.

[0006] Optionally, the electrode plate includes a material area and an electrode tab area, and several material areas and electrode tab areas are arranged alternately. The rolling mechanism is used to compact the coating on the material area.

[0007] Optionally, the tool holder is provided with a plurality of blades, the number of which is the same as the number of tab regions.

[0008] Optionally, the upper rolling wheel is mounted on the machine platform via an upper wheel axle, and the lower rolling wheel is mounted on the machine platform via a lower wheel axle.

[0009] Optionally, the upper and lower rollers are connected to a roller motor, which drives the upper and lower rollers to rotate in opposite directions.

[0010] Optionally, it also includes a take-up shaft, which is connected to a motor and driven to rotate by the motor. The take-up shaft is used to wind the crushed electrode plate into an electrode roll.

[0011] Optionally, the take-up shaft moves synchronously with the upper and lower rollers.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: 1. The lithium battery plate slitting device provided by this utility model first cuts the plate by a slitting knife mechanism before it passes through the rolling mechanism. The tab area on the plate is cut along the moving direction of the plate, so that the pressure on the tab area on the plate is released. This avoids the tab area from wrinkling because its thickness is less than that of the material area when it enters the rolling mechanism and cannot contact the rolling wheel, thus affecting the use of the plate.

[0013] 2. The lithium battery plate cutting device provided by this utility model has several blades on the blade holder, each blade corresponding to a tab area on the plate, which cuts the tab area on the plate completely apart, thereby improving the cutting efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the lithium battery plate cutting device in this embodiment of the present invention; Figure 2 This is a schematic diagram of the cutting blade mechanism in an embodiment of this utility model; Figure 3 This is a schematic diagram of the rolling mechanism in an embodiment of this utility model; Figure 4 This is a schematic diagram of the winding shaft in an embodiment of this utility model.

[0015] Explanation of reference numerals in the attached figures: 1. Slitting mechanism; 101. Blade holder; 102. Blade; 2. Rolling mechanism; 201. Upper rolling roller; 202. Lower rolling roller; 203. Upper roller shaft; 204. Lower roller shaft; 3. Winding mechanism; 301. Winding shaft; 302. Electrode roll; 4. Electrode plate; 401. Material area; 402. Electrode ear area. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use.

[0017] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0018] This embodiment provides a lithium battery electrode plate slitting device, including a slitting blade mechanism 1 and a rolling mechanism 2. The slitting blade mechanism 1 includes a blade holder 101 and a blade 102. The blade holder 101 is installed perpendicular to the moving direction of the electrode plate 4 and is used to cut the tab area 402 on the electrode plate 4 along the moving direction of the electrode plate 4. The two ends of the blade holder 101 are mounted on the machine base and are located above the slitting blade mechanism 1. The rolling mechanism 2 includes an upper rolling roller 201 and a lower rolling roller 202, and the electrode plate 4 is disposed between the upper rolling roller 201 and the lower rolling roller 202. The slitting blade mechanism 1 is located at the front end of the rolling mechanism 2, that is, the electrode plate 4 is first cut by the slitting blade mechanism 1 to cut the tab area 402 on the electrode plate 4, and then enters the rolling mechanism 2 for rolling.

[0019] like Figure 1 , Figure 2 , Figure 3 As shown, the electrode plate 4 includes a material area 401 and an electrode tab area 402, with several material areas 401 and several electrode tab areas 402 arranged alternately. Several blades 102 are also provided on the blade holder 101, the number of blades 102 being the same as the number of electrode tab areas 402. These blades 102 are spaced apart on the blade holder 101, each blade 102 corresponding to one electrode tab area 402. The blade holder 101 and blades 102 are located above the electrode tab areas on the electrode plate 4. After cutting the electrode tab area 402 along the moving direction of the electrode plate 4, it enters the compaction mechanism 2. The compaction mechanism 2 is used to compact the coating on the material area 401 of the electrode plate 4, fixing the coating onto the electrode plate 4. Cutting the electrode tab area 402 in advance releases the stress in the electrode tab area 402, preventing the coating from extending into the electrode tab area 402 and wrinkling during compaction. Example

[0020] This embodiment provides a lithium battery electrode plate cutting device based on Embodiment 1, such as... Figure 2 , Figure 4 As shown, it also includes a winding mechanism 3, which includes a winding shaft 301. One end of the winding shaft 301 is connected to a drive motor. The drive motor is mounted on the machine base and drives the winding shaft 301 to rotate, so that the electrode plate 4 is wound around the winding shaft 301 to form an electrode roll 302. The winding shaft 301 drives the electrode plate 4 to be conveyed in the direction of the winding shaft 301.

[0021] In this embodiment, the upper rolling roller 201 is mounted on the machine base via the upper axle 203 and connected to the rolling motor on the machine base. The lower rolling roller 202 is mounted on the machine base via the lower axle 204 and connected to the rolling motor on the machine base. The rolling motor drives the rotation of the upper rolling roller 201 and the lower rolling roller 202. One or two rolling motors can drive the rotation of the upper and lower rolling rollers. One rolling motor is connected to the upper rolling roller 201 and the lower rolling roller 202 via a transmission device to achieve synchronous movement of the upper and lower rolling rollers. The transmission device can be a gear or a conveyor belt, etc., to transmit the rotation of the rolling motor to the upper and lower rolling rollers. Alternatively, each of the upper and lower rolling rollers can be connected to a rolling motor, and the output speeds of the two rolling motors can be adjusted to be the same. The upper rolling roller 201 and the lower rolling roller 202 are arranged at intervals and perpendicular to the moving direction of the electrode plate 4. The gap between the upper rolling roller 201 and the lower rolling roller 202 is used to set the electrode plate 4. The electrode plate 4 is set through the gap. The upper rolling roller 201 and the lower rolling roller 202 rotate to crush the feeding area 401 of the electrode plate 4 and to convey the electrode plate 4.

[0022] The upper and lower rolling rollers 201 and 202 are driven by a rolling motor to rotate in opposite directions and at the same speed as the take-up shaft 301. The rotating upper and lower rolling rollers 201 and the rotating take-up shaft 301 work together to convey the electrode plate 4, so that all material areas 401 on the electrode plate 4 can be rolled into place. The rolled electrode plate 4 is then wound into an electrode roll 302 by the take-up shaft 301. Since the electrode tab area 402 on the electrode plate 4 is cut, the electrode roll 302 consists of several material area rolls.

[0023] The lithium battery electrode plate 4 slitting device provided in this embodiment cuts the tab area 402 by setting a slitting blade mechanism 1 before the rolling mechanism 2, so that each material area 401 is set independently. When the material area 401 is rolled by the rolling mechanism 2, the material area 401 can be rolled to the maximum extent, which reduces the space and spacing between the coating particles on the material area 401, resulting in better ion transport. The electrode plate 4 is not affected by the tab area 402 during the rolling process, so the thickness of the electrode plate 4 can be effectively controlled. The edge of the material area 401 is not affected by the tab area 402 and will not wrinkle, affecting its use.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A lithium battery electrode plate cutting device, characterized in that, include: A slitting mechanism is used to cut the tab area on the electrode plate along the electrode plate moving direction, and includes a blade holder and a blade, wherein the blade is mounted on the blade holder; A rolling mechanism for rolling an electrode plate includes an upper rolling wheel and a lower rolling wheel, wherein the electrode plate is located between the upper rolling wheel and the lower rolling wheel; The machine base is used to install the slitting and crushing mechanisms; The electrode plate is first cut open in the tab area by the cutting blade mechanism, and then it enters the rolling mechanism for rolling.

2. The lithium battery electrode plate slitting device according to claim 1, characterized in that, The tool holder is arranged perpendicular to the electrode plate, and both ends of the tool holder are mounted on the machine base.

3. The lithium battery electrode plate slitting device according to claim 1, characterized in that, The electrode plate includes a material area and an electrode tab area, and several material areas and electrode tab areas are arranged alternately. The rolling mechanism is used to compact the coating on the material area.

4. The lithium battery electrode plate slitting device according to claim 3, characterized in that, The tool holder is provided with a number of blades, the number of which is the same as the number of tab regions.

5. The lithium battery electrode plate slitting device according to claim 1, characterized in that, The upper rolling roller is mounted on the machine platform via an upper roller axle, and the lower rolling roller is mounted on the machine platform via a lower roller axle.

6. The lithium battery electrode plate slitting device according to claim 5, characterized in that, The upper and lower rollers are connected to a roller motor, which drives the upper and lower rollers to rotate. The upper and lower rollers rotate in opposite directions.

7. The lithium battery electrode plate slitting device according to claim 6, characterized in that, It also includes a take-up shaft, which is connected to a motor. The motor drives the take-up shaft to rotate, and the take-up shaft is used to wind up the crushed electrode plates into an electrode roll.

8. The lithium battery electrode plate slitting device according to claim 7, characterized in that, The winding shaft moves synchronously with the upper and lower rolling rollers.

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