Lithium ion battery coating gasket edge thinning structure

Abstract

The utility model relates to the technical field of coating, in particular to a lithium ion battery coating gasket edge thinning structure which comprises a coating gasket base material, the coating gasket base material comprises a bottom edge, side edges connected to the two ends of the bottom edge and flow deflectors connected to the side edges respectively, and the two flow deflectors are oppositely arranged. Chamfers are arranged on the end faces, close to each other, of the two flow deflectors. According to the utility model, the chamfer is designed at the edge of the gasket, so that the flow rate of slurry reaching the edge is reduced, the extension of the slurry is increased, the purpose of draining the slurry is achieved, and the thinning width of the pole piece can be controlled by adjusting the size of the chamfer, so that the thinning of the coated pole piece is quantitatively controlled; and the thinned tab is arranged at the chamfer, so that the thickness of the thinned tab is smaller than that of the coated gasket base material, the flow of slurry at the edge of the gasket can be reduced, the flow of the slurry at the tab part is reduced, and the thinned amount of the pole piece can be controlled by adjusting the thickness and width of the thinned tab.

Description

Technical Field

[0007]

[0001] The utility model relates to the technical field of coating, in particular to a structure for thinning the edge of a coating gasket of a lithium-ion battery. Background Art

[0002] Lithium-ion batteries have the characteristics of small volume, light weight, high energy density, long cycle life, etc., and are widely used in various fields. At present, in the manufacturing process of lithium-ion batteries, the coating process is an important process in the manufacturing process of lithium-ion batteries, and the purpose is to uniformly cover the active material on the surface of the current collector. In the prior art, the coating process mostly adopts extrusion coating. In extrusion coating, since the coating die head adopts a constant pressure mode, if no treatment is done to the coating gasket, the flow rate of the slurry near the edge of the gasket is faster than that in the middle area. After the slurry is coated on the gasket substrate and dried, it will cause abnormal conditions such as thick edges and bulging edges at the edge of the electrode sheet, affecting subsequent production.

[0003] The existing Chinese patent application CN220072192U discloses an extrusion coating gasket for a lithium-ion battery. This disclosed patent realizes enhancing the thinning effect of the gasket on the slurry during the electrode sheet coating process of the lithium-ion battery by directly opening a chamfer structure at the edge of the gasket. This scheme is a good exploration of the coating gasket structure, but there is still room for further improvement. Summary of the Utility Model

[0004] The utility model provides a structure for thinning the edge of a coating gasket of a lithium-ion battery to solve the problems raised in the above background art.

[0005] To solve the above technical problems, the technical scheme adopted by the utility model is:

[0006] A structure for thinning the edge of a coating gasket of a lithium-ion battery includes a coating gasket substrate in a "U" - shaped frame. The coating gasket substrate includes a bottom edge, side edges connected to both ends of the bottom edge, and flow guiding sheets respectively connected to the side edges. The two flow guiding sheets are arranged facing each other, and chamfers are provided on the end faces of the two flow guiding sheets close to each other. Thinning tabs are respectively provided at the two chamfers, and the thickness of the thinning tabs is thinner than the thickness of the coating gasket substrate.

[0007] The edge of the coating gasket is designed as a chamfer, and thinning tabs are provided at the chamfer to achieve the purpose of guiding the slurry flow and reducing the slurry flow rate at the tab part.

[0008] Preferably, the thinning tab includes a longitudinal section fitting on one side of the flow guiding sheet and a triangular section connected to one side of the longitudinal section and adapted to the chamfer, and the inclined side of the chamfer is parallel to the inclined side of the triangular section.

[0009] Preferably, the transverse line value of the chamfer is 2 - 4 mm.

[0010] Preferably, the longitudinal line value of the chamfer is 1-2 mm.

[0011] Preferably, the total thickness of the thinned tab is 0.4-0.6 times the total thickness of the coated gasket substrate.

[0012] Preferably, the two guide plates have the same size and are symmetrically arranged, and both of the guide plates are parallel to the bottom edge.

[0013] Preferably, the coating gasket substrate is provided with a plurality of through holes, and the plurality of through holes are symmetrically distributed on the coating gasket substrate.

[0014] Preferably, the space between the two guide plates forms an opening.

[0015] Preferably, the coating gasket substrate is a stainless steel plate.

[0016] By adopting the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0017] In the utility model, a triangular chamfer is designed on the edge of the coated gasket substrate to reduce the flow rate of the slurry when it reaches the edge and increase the extension of the slurry, thereby achieving the purpose of draining the slurry, and by adjusting the size of the chamfer on the gasket edge, the electrode thinning width can be controlled to achieve quantitative control of the thinning of the coated electrode; and a thinned electrode ear is provided at the chamfer so that the thickness of the thinned electrode ear is thinner than the thickness of the coated gasket substrate, which can reduce the flow of the slurry at the gasket edge and the slurry flow in the electrode ear part, and by adjusting the thickness and width of the thinned electrode ear, the thinning amount of the electrode can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 3 This is a schematic diagram of the thinned tab structure of the utility model.

[0021] In the figure: 1, coated gasket substrate; 11, bottom edge; 12, side edge; 13, guide plate; 2, chamfer; 3, thinned tab; 31, longitudinal section; 32, triangular section; 4, through hole; 5, opening. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the limitations of the specific embodiments disclosed in the following specification.

[0024] As Figure 1-3 shown, the present utility model provides a structure for thinning the edge of a lithium-ion battery coating gasket, which includes a coating gasket substrate 1 in a "U" - shaped frame. The coating gasket substrate 1 is made of stainless steel sheet. The coating gasket substrate 1 includes a bottom edge 11, side edges 12 connected to both ends of the bottom edge 11, and flow guiding pieces 13 respectively connected to the side edges 12. The two flow guiding pieces 13 face each other. The space between the two flow guiding pieces 13 forms an opening 5. Chamfers 2 are provided on the end faces of the two flow guiding pieces 13 close to each other. Thinned tabs 3 are provided at the two chamfers 2 respectively. The thickness of the thinned tab 3 is thinner than that of the coating gasket substrate 1.

[0025] The thinned tab 3 includes a longitudinal section 31 that fits on one side of the flow guiding piece 13 and a triangular section 32 connected to one side of the longitudinal section 31 and adapted to the chamfer 2. The inclined side of the chamfer 2 is parallel to the inclined side of the triangular section 32.

[0026] The horizontal line value of the chamfer 2 is 2 - 4 mm, and the vertical line value of the chamfer 2 is 1 - 2 mm. As Figure 1 shown in, the specification of the chamfer 2 is a*b, where a is the horizontal line and b is the vertical line. The size combination of the chamfer 2 usually adopts 2 mm * 1 mm, 3 mm * 1.5 mm or 4 mm * 2 mm. By designing a triangular chamfer 2 at the gasket edge, the flow rate of the slurry when it reaches the edge is reduced, and the extension of the slurry is increased, so as to achieve the purpose of guiding the slurry. And by adjusting the size of the chamfer 2 at the gasket edge, the thinning width of the pole piece can be controlled, and the thinning of the coating pole piece can be quantitatively controlled.

[0027] The total thickness of the thinned tab 3 is 0.4 - 0.6 times the total thickness of the coating gasket substrate 1, and the multiple is usually 0.4 times, 0.5 times or 0.6 times. By making the thickness of the thinned tab 3 thinner than that of the coating gasket substrate 1, the flow rate of the slurry at the gasket edge can be reduced, and the flow rate of the slurry at the tab part is reduced. And by adjusting the thickness and width of the thinned tab 3, the thinning amount of the pole piece can be controlled.

[0028] The two flow guiding pieces 13 have the same size and are symmetrically arranged, and both flow guiding pieces 13 are parallel to the bottom edge 11.

[0029] A plurality of through holes 4 are provided on the coating gasket substrate 1, and the plurality of through holes 4 are symmetrically distributed on the coating gasket substrate 1. Embodiment

[0030] A lithium-ion battery coated gasket edge thinning structure includes a coated gasket substrate 1 in the shape of a U-shaped frame. The coated gasket substrate 1 is a stainless steel plate. The coated gasket substrate 1 includes a bottom edge 11, side edges 12 connected to both ends of the bottom edge 11, and guide plates 13 respectively connected to the side edges 12. The two guide plates 13 are arranged facing each other, and the space between the two guide plates 13 forms an opening 5. The end surfaces of the two guide plates 13 that are close to each other are both provided with chamfers 2. The two guide plates 13 are of the same size and are symmetrically arranged. The two guide plates 13 are parallel to the bottom edge 11, and thinned ears 3 are respectively provided at the two chamfers 2. The thickness of the thinned ears 3 is thinner than the thickness of the coated gasket substrate 1. The thinned ears 3 include a longitudinal section 31 attached to one side of the guide plate 13 and a triangular section 32 connected to one side of the longitudinal section 31 and adapted to the chamfer 2, and the inclined side of the chamfer 2 is parallel to the inclined side of the triangular section 32. A plurality of through holes 4 are opened on the coated gasket substrate 1, and the plurality of through holes 4 are symmetrically distributed on the coated gasket substrate 1.

[0031] like Figure 1 , the edge chamfer 2 size of the coated gasket substrate 1 is 3mm*1.5mm, the thickness of the coated gasket substrate 1 is 1.0mm, the thickness of the thinned tab 3 is 0.4mm, the width is 2.5mm, and the length is 6mm, and the positive electrode coating production is carried out. After the coating is stable, a section of the electrode is taken to measure the thinning. The thickness of the electrode edge is measured with a micrometer, and the thickness is tested every 5mm until the thickness does not change. The distance from the position where the electrode thickness does not change significantly to the edge is the thinning width, and the difference between the thickness of the middle electrode and the thickness of the edge is the thinning amount. The results of the thinning of the positive electrode edge are shown in Table 1.

[0032] Table 1 Results of thinning the positive electrode edge

[0033]

[0034] According to the measurement results in Table 1 above, the electrode thinning width is 10-15mm, and the thinning amount is 28.7 / 39.3μm. Both the thinning width and the thinning amount meet the production requirements. Example

[0035] A lithium-ion battery coated gasket edge thinning structure includes a coated gasket substrate 1 in the shape of a U-shaped frame. The coated gasket substrate 1 is a stainless steel plate. The coated gasket substrate 1 includes a bottom edge 11, side edges 12 connected to both ends of the bottom edge 11, and guide plates 13 respectively connected to the side edges 12. The two guide plates 13 are arranged facing each other, and the space between the two guide plates 13 forms an opening 5. The end surfaces of the two guide plates 13 that are close to each other are both provided with chamfers 2. The two guide plates 13 are of the same size and are symmetrically arranged. The two guide plates 13 are parallel to the bottom edge 11, and thinned ears 3 are respectively provided at the two chamfers 2. The thickness of the thinned ears 3 is thinner than the thickness of the coated gasket substrate 1. The thinned ears 3 include a longitudinal section 31 attached to one side of the guide plate 13 and a triangular section 32 connected to one side of the longitudinal section 31 and adapted to the chamfer 2, and the inclined side of the chamfer 2 is parallel to the inclined side of the triangular section 32. A plurality of through holes 4 are opened on the coated gasket substrate 1, and the plurality of through holes 4 are symmetrically distributed on the coated gasket substrate 1.

[0036] like Figure 1 The coating gasket substrate 1 has an edge chamfer 2 dimension of 2mm x 1mm and a thickness of 1.0mm. The thinned tab 3 has a thickness of 0.4mm, a width of 2.5mm, and a length of 8mm. Negative electrode coating production was performed. After the coating stabilized, a section of the electrode was measured for thinning. The results of the negative electrode edge thinning are shown in Table 2.

[0037] Table 2 Results of negative electrode edge thinning

[0038]

[0039] According to the measurement results in Table 2 above, the electrode thinning width is 5-10 mm, and the thinning amount is 23 / 27.1 μm, which are smaller than the thinning width and thinning amount verified in Example 1.

[0040] Therefore, the above-mentioned multiple embodiments prove that the present invention can conveniently control the thinning width and thinning amount of the coated electrode, meet the requirements of coating production for electrode thinning, and improve the processing performance of lithium-ion battery electrode.

[0041] In the present invention, the term "plurality" refers to two or more than two, unless otherwise expressly defined. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items. Terms such as "installation", "connection", "connection", and "fixed" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0042] It should be noted that when an element is referred to as being "assembled to," "mounted to," "fixed to," or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0043] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0044] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A lithium-ion battery coating gasket edge thinning structure, characterized in that: The invention comprises a coated gasket substrate (1), wherein the coated gasket substrate (1) comprises a bottom edge (11), side edges (12) connected to both ends of the bottom edge (11), and guide plates (13) respectively connected to the side edges (12), wherein the two guide plates (13) are arranged facing each other, and the end surfaces of the two guide plates (13) close to each other are both provided with chamfers (2), and thinned pole ears (3) are respectively provided at the two chamfers (2), and the thickness of the thinned pole ears (3) is thinner than the thickness of the coated gasket substrate (1).

2. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The thinned tab (3) comprises a longitudinal section (31) attached to one side of the guide plate (13) and a triangular section (32) connected to one side of the longitudinal section (31) and adapted to the chamfer (2), and the inclined side of the chamfer (2) is parallel to the inclined side of the triangular section (32).

3. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The transverse line value of the chamfer (2) is 2-4 mm.

4. The lithium-ion battery coating gasket edge thinning structure according to claim 3, characterized in that: The longitudinal line value of the chamfer (2) is 1-2 mm.

5. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The total thickness of the thinned tab (3) is 0.4-0.6 times the total thickness of the coated gasket substrate (1).

6. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The two guide plates (13) have the same size and are symmetrically arranged, and both guide plates (13) are parallel to the bottom edge (11).

7. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The coating gasket substrate (1) is provided with a plurality of through holes (4), and the plurality of through holes (4) are symmetrically distributed on the coating gasket substrate (1).

8. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The space between the two guide plates (13) forms an opening (5).

9. The lithium-ion battery coating gasket edge thinning structure according to claim 1, characterized in that: The coating gasket substrate (1) is a stainless steel plate.

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