Lithium ion battery pole piece flattening effect measuring device and measuring method

Abstract

The invention discloses a lithium ion battery pole piece flattening effect measuring device and method, the measuring device comprises a main ruler, a slave ruler used for measuring the length of an active substance area and a connecting ruler used for measuring a current collector area, and the main ruler, the slave ruler and the connecting ruler are all provided with scales; the auxiliary ruler is perpendicularly and fixedly connected to the end of the main ruler, a positioning right angle is formed at the connecting position of the main ruler and the auxiliary ruler so as to position a sample of the battery pole piece, a groove parallel to the main ruler is formed in the main ruler, and the connecting ruler is slidably connected into the groove through a connecting piece. And the connecting ruler is rotationally connected with the connecting piece. The measuring device is simple in structure and convenient for commercialized popularization and application, and the measuring method is efficient and accurate.

Description

Technical Field

[0001] The invention relates to the technical field of measuring tools, and in particular to a device and method for measuring the flattening effect of a lithium-ion battery pole piece. Background Art

[0002] like Figure 2 As shown in the figure, the battery electrode is composed of a current collector and an active material coated on its surface. The area on the current collector surface coated with the active material is the active material area 9, and the area not coated with the active material is the current collector area blank area, also called the current collector area 7. The junction of the current collector area 7 and the active material area 9 is the current collector and active material area junction 8.

[0003] With the increasing market demand for high energy density lithium-ion batteries, the surface density and compaction density of battery pole pieces are also gradually increasing. However, during the rolling process of the battery pole piece, the active material area 9 and the current collector area 7 have different elongation rates, which makes the current collector area 7 prone to wrinkles, wavy edges and other problems, resulting in poor pole pieces. Currently, the market uses rolling and flattening equipment to flatten the current collector so that the elongation effect areas of the active material area 9 and the current collector area 7 are consistent. However, insufficient flattening and excessive flattening of the pole piece will cause the pole piece to have problems such as wrinkles and wavy edges, resulting in poor subsequent battery production. Currently, there is no effective way to detect the flattening effect on the market, and further research and development is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a device for measuring the flattening effect of a lithium-ion battery pole piece in order to solve the problem that the flattening effect of a lithium-ion battery pole piece in the prior art cannot be detected.

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

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

[0007] A device for measuring the flattening effect of a lithium-ion battery pole piece, comprising a main ruler, a slave ruler for measuring the length of an active material region, and a connecting ruler for measuring a current collector region, wherein the main ruler, the slave ruler, and the connecting ruler are all provided with scales;

[0008] The slave scale is vertically fixedly connected to the end of the main scale, and the position where the main scale and the slave scale are connected forms a positioning right angle to position the sample of the battery electrode sheet. The main scale is provided with a groove arranged parallel to the main scale, and the connecting scale is slidably connected to the groove through a connecting piece, and the connecting scale is rotatably connected to the connecting piece.

[0009] In the above technical solution, the connecting member 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, and the end of the connecting ruler is rotatably connected to the screw.

[0010] In the above technical solution, the connecting member includes a slider, the slider 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 scales are correspondingly located on the inner side of the main scale, the slave scale or the connecting scale.

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

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

[0014] Step 1, taking the lithium-ion battery pole piece after rolling and flattening, cutting a sample with a right angle corner, and fitting the right angle of the sample with the positioning right angle;

[0015] Step 2, using the ruler to measure the length of the active material area in the sample, recorded as L1;

[0016] Step 3, straighten the current collector area with wrinkles and wavy edges to eliminate the wrinkles and waves, adjust the angle of the connecting ruler through the connecting piece, make the connecting ruler parallel to the edge of the current collector area, and use the connecting ruler to measure the length of the current collector after straightening, recorded as L2;

[0017] Step 4: Determine the flattening effect:

[0018] If L1 and L2 are equal, it indicates that the flattening effect of the lithium-ion battery electrode 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 is transitionally flattened.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The measuring device of the present invention has a simple structure and is convenient for commercial promotion and application. It can quickly detect the rolling and flattening effect of the pole piece, and the measurement is more efficient and accurate.

[0023] 2. The angle between the connecting ruler and the main ruler of the present invention can be adjusted, which effectively improves the reliability of the measurement method of the present invention. If the length of the active material area is greater than the length of the current collector area, the flattening is insufficient and the flattening effect needs to be increased; if the length of the active material area is less than the length of the current collector area, the flattening is excessive and the flattening effect needs to be reduced. When the current collector area is slightly tilted, the rotatable connecting ruler can accurately measure the length of the edge of the current collector area, thereby accurately evaluating the flattening effect.

[0024] 3. The measuring method of the present invention can instantly detect the flattening effect of the electrode, reduce the subsequent poor production of batteries caused by poor flattening, and thus improve the battery yield. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 It is a schematic diagram of the use state of the measuring device of the present invention.

[0027] In the figure: 1-main scale, 2-sub-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 the current collector after straightening. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Example 1

[0030] A device for measuring the flattening effect of a lithium-ion battery pole piece, comprising a main ruler 1, a slave ruler 2 for measuring the length of an active material region, and a connecting ruler 3 for measuring a current collector region, wherein the main ruler 1, the slave ruler 2, and the connecting ruler 3 are all provided with scales, and preferably, the scales are correspondingly located on the inner side of the main ruler, the slave ruler, or the connecting ruler 3;

[0031] In order to ensure the measurement accuracy, the slave ruler 2 is vertically fixedly connected to the end of the main ruler 1, and the position where the slave ruler 2 and the main ruler 1 are connected forms a positioning right angle to position the sample of the battery pole piece. The main ruler 1 is provided with a groove 4 arranged parallel to it, and the connecting ruler 3 is slidably connected to the groove 4 through a connecting piece. The connecting ruler 3 is rotatably connected to the connecting piece, and the spacing between the connecting ruler 3 and the main ruler 1 can be adjusted to measure the flattening effect of battery pole pieces of different widths. By adjusting the angle between the connecting ruler 3 and the connecting piece, the connecting ruler 3 can be parallel to the edge of the current collector area 7, and the connecting ruler 3 can be used to measure the length of the current collector area 7.

[0032] Preferably, the connecting member is composed 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, and the end of the connecting ruler 3 is rotatably connected to the screw 5, or, the connecting member 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 scale 1, the secondary scale 2 and the connecting scale 3 are made of plastic or stainless steel.

[0034] Example 2

[0035] The method for measuring the flattening effect of a lithium-ion battery pole piece based on the measuring device comprises the following steps:

[0036] Step 1, taking the lithium-ion battery pole piece after rolling and flattening, cutting a sample with a right angle corner, and fitting the right angle of the sample with the positioning right angle;

[0037] Step 2, using the ruler 2 to measure the length of the active material area 9 in the sample, recorded as L1;

[0038] Step 3, straighten the current collector region 7 with wrinkles and wavy edges to eliminate the wrinkles and waves, adjust the angle of the connecting ruler 3 through the connecting piece, make the connecting ruler 3 and the edge of the current collector region 7 parallel, and use the connecting ruler 3 to measure the length 10 of the current collector after straightening, recorded as L2;

[0039] Step 4: Determine the flattening effect:

[0040] If L1 and L2 are equal, it indicates that the flattening effect of the lithium-ion battery electrode 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 is transitionally flattened.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for measuring the flattening effect of a lithium-ion battery pole piece, characterized in that: It includes a main ruler, a sub-rule for measuring the length of the active material area, and a connecting ruler for measuring the current collector area, and the main ruler, sub-rule and connecting ruler are all provided with scales; The slave scale is vertically fixedly connected to the end of the main scale, and the position where the main scale and the slave scale are connected forms a positioning right angle to position the sample of the battery electrode sheet. The main scale is provided with a groove arranged parallel to the main scale, and the connecting scale is slidably connected to the groove through a connecting piece, and the connecting scale is rotatably connected to the connecting piece.

2. The measuring device according to claim 1, characterized in that The connecting member is composed of a screw which passes through the connecting ruler and the groove in sequence and a nut which is rotatably connected to the end of the screw, and the end of the connecting ruler is rotatably connected to the screw.

3. The measuring device according to claim 1, characterized in that The connecting member comprises a slider, the slider 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 measuring device according to claim 1, characterized in that The scales are correspondingly located on the inner side of the main scale, the slave scale or the connecting scale.

5. The measuring device according to claim 1, characterized in that The main scale, the slave scale and the connecting scale are made of plastic or stainless steel.

6. A method for measuring the flattening effect of a lithium-ion battery electrode sheet based on the measuring device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, taking the lithium-ion battery pole piece after rolling and flattening, cutting a sample with a right angle corner, and fitting the right angle of the sample with the positioning right angle; Step 2, using the ruler to measure the length of the active material area in the sample, recorded as L1; Step 3, straighten the current collector area with wrinkles and wavy edges to eliminate the wrinkles and waves, adjust the angle of the connecting ruler through the connecting piece, make the connecting ruler parallel to the edge of the current collector area, and use the connecting ruler to measure the length of the current collector after straightening, recorded as L2; Step 4: Determine the flattening effect: If L1 and L2 are equal, it indicates that the flattening effect of the lithium-ion battery electrode 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 is transitionally flattened.

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