A device and method for measuring the flattening effect of lithium-ion battery electrodes

Abstract

This invention discloses a device and method for measuring the flattening effect of lithium-ion battery electrodes. The measuring device includes a main scale, a secondary scale for measuring the length of the active material region, and a connecting scale for measuring the current collector region. The main scale, secondary scale, and connecting scale are all equipped with graduations. The secondary scale is vertically fixed to the end of the main scale, and the connection point of the main scale and the secondary scale forms a positioning right angle for positioning the battery electrode sample. The main scale has a groove parallel to the main scale, and the connecting scale is slidably connected to the groove via a connector. The connecting scale and the connector are rotatably connected. The measuring device of this invention has a simple structure, is easy to commercialize and apply, and the measuring method is efficient and accurate.

Description

Technical Field

[0001] This invention relates to the field of measuring tools, and in particular to a device and method for measuring the flattening effect of lithium-ion battery electrodes. Background Technology

[0002] like Figure 2 As shown, the battery electrode consists of a current collector and an active material coated on its surface. The area on the surface of the current collector coated with active material is called the active material area 9, and the area without active material coating is called the blank area of ​​the current collector area, also known as the current collector area 7. The position where the current collector area 7 and the active material area 9 meet is called the current collector and active material area boundary 8.

[0003] With the increasing market demand for high-energy-density lithium-ion batteries, the areal density and compaction density of battery electrodes are also gradually increasing. However, during the rolling process, the active material region 9 and the current collector region 7 have different elongations, which can easily lead to problems such as wrinkles and wavy edges in the current collector region 7, resulting in defective electrodes. Currently, the market uses rolling and flattening equipment to flatten the current collector to make the elongation of the active material region 9 and the current collector region 7 consistent. However, insufficient flattening and excessive flattening will cause problems such as wrinkles and wavy edges in the electrode, leading to subsequent battery production defects. At present, there is no effective way to detect the flattening effect on the market, and further research and development are urgently needed. Summary of the Invention

[0004] The purpose of this invention is to address the problem in the prior art that the flattening effect of lithium-ion battery electrodes cannot be detected, and to provide a device for measuring the flattening effect of lithium-ion battery electrodes.

[0005] Another object of the present invention is to provide a method for measuring the flattening effect of lithium-ion battery electrodes based on the aforementioned measuring device.

[0006] The technical solution adopted to achieve the purpose of this invention is:

[0007] A lithium-ion battery electrode flattening effect measuring device includes a main scale, a secondary scale for measuring the length of the active material region, and a connecting scale for measuring the current collector region. The main scale, secondary scale, and connecting scale are all provided with graduations.

[0008] The secondary ruler is vertically fixed to the end of the main ruler. The connection point of the main ruler and the secondary ruler forms a positioning right angle to position the sample of the battery electrode. The main ruler has a groove parallel to it. The connecting ruler is slidably connected to the groove through a connector. The connecting ruler and the connector are rotatably connected.

[0009] In the above technical solution, the connector is composed of a screw that passes through the connecting ruler and the groove in sequence, and a nut that is rotatably connected to the end of the screw. The end of the connecting ruler is rotatably connected to the screw.

[0010] In the above technical solution, the connector includes a slider, which is rotatably connected to the groove, and the end of the connecting ruler is rotatably connected to the slider via a connecting shaft.

[0011] In the above technical solution, the scale is located on the inside of the main scale, the secondary scale, or the connecting scale.

[0012] In the above technical solution, the main ruler, the slave ruler, and the connecting ruler are made of plastic or stainless steel.

[0013] Another aspect of the present invention includes a method for measuring the flattening effect of lithium-ion battery electrodes based on the aforementioned measuring device, comprising the following steps:

[0014] Step 1: Take the flattened lithium-ion battery electrode sheet, cut a sample with right angles, and align the right angles of the sample with the positioning right angles.

[0015] Step 2: Measure the length of the active material region in the sample using a ruler, and denot it as L1;

[0016] Step 3: Straighten the collector area with wrinkles and wavy edges to eliminate wrinkles and wavy edges. Adjust the angle of the connecting ruler through the connector so that the connecting ruler is parallel to the edge of the collector area. Use the connecting ruler to measure the length of the collector after straightening, and record it as L2.

[0017] Step 4, judging the flattening effect:

[0018] If L1 and L2 are equal, it indicates that the lithium-ion battery electrode flattening effect is good;

[0019] If L1 is greater than L2, it indicates that the lithium-ion battery electrode is not flattened enough.

[0020] If L1 is less than L2, it indicates that the lithium-ion battery electrode has become excessively flattened.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The measuring device of the present invention has a simple structure and is easy to commercialize and apply. It can quickly detect the flattening effect of the electrode roll, and the measurement is more efficient and accurate.

[0023] 2. The angle between the connecting ruler and the main ruler of this invention is adjustable, effectively improving the reliability of the measurement method. If the length of the active material region is greater than the length of the collector region, the flattening is insufficient, and the flattening effect needs to be increased; if the length of the active material region is less than the length of the collector region, the flattening is too gradual, and the flattening effect needs to be reduced. When the collector region exhibits a slight tilt, the rotatable connecting ruler can accurately measure the length of the edge of the collector region, thereby precisely evaluating the flattening effect.

[0024] 3. The measurement method of the present invention can detect the flattening effect of the electrode sheet in real time, reduce the defects in subsequent battery production caused by poor flattening, and thus improve the battery yield. Attached Figure Description

[0025] Figure 1 This is the measuring device of the present invention.

[0026] Figure 2 This is a schematic diagram showing the usage state of the measuring device of the present invention.

[0027] In the diagram: 1-Main scale, 2-Secondary scale, 3-Connecting scale, 4-Groove, 5-Screw, 6-Scale line, 7-Current collector area, 8-Boundary between current collector and active material area, 9-Active material area, 10-Length of current collector after straightening. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0029] Example 1

[0030] A lithium-ion battery electrode flattening effect measuring device includes a main ruler 1, a secondary ruler 2 for measuring the length of the active material region, and a connecting ruler 3 for measuring the current collector region. The main ruler 1, the secondary ruler 2, and the connecting ruler 3 are all provided with scales. Preferably, the scales are located on the inner side of the main ruler, the secondary ruler, or the connecting ruler 3.

[0031] To ensure measurement accuracy, the secondary ruler 2 is vertically fixed to the end of the main ruler 1. The connection point of the secondary ruler 2 and the main ruler 1 forms a positioning right angle to position the battery electrode sample. The main ruler 1 has a groove 4 parallel to it, and the connecting ruler 3 is slidably connected to the groove 4 via a connector. The connecting ruler 3 is rotatably connected to the connector. By adjusting the distance between the connecting ruler 3 and the main ruler 1, the flattening effect of battery electrodes of different widths can be measured. By adjusting the angle between the connecting ruler 3 and the connector, the connecting ruler 3 can be made parallel to the edge of the current collector area 7, and the length of the current collector area 7 can be measured using the connecting ruler 3.

[0032] Preferably, the connector consists of a screw 5 that passes through the connecting ruler 3 and the groove 4 in sequence, and a nut that is rotatably connected to the end of the screw 5. The end of the connecting ruler 3 is rotatably connected to the screw 5. Alternatively, the connector includes a slider that is rotatably connected to the groove 4, and the end of the connecting ruler 3 is rotatably connected to the slider via a connecting shaft.

[0033] Preferably, the main ruler 1, the secondary ruler 2, and the connecting ruler 3 are made of plastic or stainless steel.

[0034] Example 2

[0035] The method for measuring the flattening effect of lithium-ion battery electrodes based on the aforementioned measuring device includes the following steps:

[0036] Step 1: Take the flattened lithium-ion battery electrode sheet, cut a sample with right angles, and align the right angles of the sample with the positioning right angles.

[0037] Step 2: Measure the length of the active material region 9 in the sample using ruler 2, and denote it as L1;

[0038] Step 3: Straighten the collector area 7 with wrinkles and wavy edges to eliminate wrinkles and wavy edges. Adjust the angle of the connecting ruler 3 through the connector so that the connecting ruler 3 is parallel to the edge of the collector area 7. Use the connecting ruler 3 to measure the length 10 of the collector after straightening, and record it as L2.

[0039] Step 4, judging the flattening effect:

[0040] If L1 and L2 are equal, it indicates that the lithium-ion battery electrode flattening effect is good;

[0041] If L1 is greater than L2, it indicates that the lithium-ion battery electrode is not flattened enough.

[0042] If L1 is less than L2, it indicates that the lithium-ion battery electrode has become excessively flattened.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for measuring the flattening effect of lithium-ion battery electrodes, characterized in that, The measurement method is based on a measuring device: The measuring device includes a main scale, a secondary scale for measuring the length of the active material region, and a connecting scale for measuring the current collector region. The main scale, secondary scale, and connecting scale are all provided with graduations. The secondary ruler is vertically fixed to the end of the main ruler. The connection point of the main ruler and the secondary ruler forms a positioning right angle to position the sample of the battery electrode. The main ruler has a groove parallel to it. The connecting ruler is slidably connected to the groove through a connector. The connecting ruler and the connector are rotatably connected. The measurement method includes the following steps: Step 1: Take the flattened lithium-ion battery electrode sheet, cut a sample with right angles, and align the right angles of the sample with the positioning right angles. Step 2: Measure the length of the active material region in the sample using a ruler, and denot it as L1; Step 3: Straighten the collector area with wrinkles and wavy edges to eliminate wrinkles and wavy edges. Adjust the angle of the connecting ruler through the connector so that the connecting ruler is parallel to the edge of the collector area. Use the connecting ruler to measure the length of the collector after straightening, and record it as L2. Step 4, judging the flattening effect: If L1 and L2 are equal, it indicates that the lithium-ion battery electrode flattening effect is good; If L1 is greater than L2, it indicates that the lithium-ion battery electrode is not flattened enough. If L1 is less than L2, it indicates that the lithium-ion battery electrode has become excessively flattened.

2. The method for measuring the flattening effect of lithium-ion battery electrodes as described in claim 1, characterized in that, The connector consists of a screw that passes through the connecting ruler and the groove in sequence, and a nut that is rotatably connected to the end of the screw. The end of the connecting ruler is rotatably connected to the screw.

3. The method for measuring the flattening effect of lithium-ion battery electrodes as described in claim 1, characterized in that, The connector includes a slider that is rotatably connected to the groove, and the end of the connecting ruler is rotatably connected to the slider via a connecting shaft.

4. The method for measuring the flattening effect of lithium-ion battery electrodes as described in claim 1, characterized in that, The scale is located on the inside of the main scale, the secondary scale, or the connecting scale.

5. The method for measuring the flattening effect of lithium-ion battery electrodes as described in claim 1, characterized in that, The main scale, the secondary scale, and the connecting scale are made of plastic or stainless steel.

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