Coating gasket

Abstract

The utility model discloses a coating gasket which comprises an upper gasket and a lower gasket, an insulating slurry channel and an electrode slurry channel are formed between the upper gasket and the lower gasket, the insulating slurry channel is provided with an insulating slurry discharge port, and the electrode slurry channel is provided with an electrode slurry discharge port. The insulating slurry discharge port is far away from the middle part of the upper gasket and / or the lower gasket relative to the electrode slurry discharge port, and a coating interval is formed between the insulating slurry discharge port and the electrode slurry discharge port. According to the utility model, the coating gasket, the upper gasket and the lower gasket are arranged in the die head, the insulating slurry is coated on the current collector through the insulating slurry channel, and the electrode slurry in the electrode slurry channel is used for coating the electrode, so that the mixing problem of the insulating slurry and the electrode slurry is avoided, the scrap of the pole piece is reduced, the quality of the battery is improved, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment accessories related to lithium battery manufacturing, in particular to a coating gasket. Background Art

[0002] Extrusion coating is widely used in the manufacture of lithium-ion batteries due to its advantages such as good coating thickness consistency and high efficiency. In the electrode manufacturing process, positive and negative electrodes are usually punched or laser cut into a certain size, but during punching or laser cutting, problems such as burrs on the cutting edges and wrinkles on the base of the pole ears are prone to occur, causing safety hazards to the battery. The current common solution is to apply an insulating coating on the edges of the positive and negative electrode sheets. When coating, the insulating coating is extruded through the gasket through the prefabricated channel inside the die head and coated on the edge of the electrode sheet. The prefabricated groove structure channel on the gasket determines the width, thickness and other parameter requirements of the insulating coating, but the current gasket structure is prone to mixing of insulating slurry and electrode slurry, resulting in reduced battery performance and scrapped electrodes.

[0003] Therefore, it is necessary to develop a new type of coated gasket that can avoid the problem of mixing insulating slurry and electrode slurry, reduce pole piece scrapping, improve battery quality, and enhance safety. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a coated gasket, which solves the problem of mixing of insulating slurry and electrode slurry by prefabricating channels in double gaskets, reduces pole piece scrapping, and improves battery manufacturing safety.

[0005] The utility model proposes a coating gasket, comprising an upper gasket and a lower gasket, wherein an insulating slurry channel and an electrode slurry channel are formed between the upper gasket and the lower gasket, the insulating slurry channel has an insulating slurry outlet, the electrode slurry channel has an electrode slurry outlet, the insulating slurry outlet is away from the middle of the upper gasket and / or the lower gasket relative to the electrode slurry outlet, and a coating interval is formed between the insulating slurry outlet and the electrode slurry outlet.

[0006] Preferably, the insulating slurry outlet is away from the middle of the upper gasket relative to the electrode slurry outlet.

[0007] Preferably, the insulating slurry channels are provided in two groups, one group of the insulating slurry channels is located on one side of the upper gasket and / or the lower gasket, the other group of the insulating slurry channels is located on the other side of the upper gasket and / or the lower gasket, and the electrode slurry channels are located between the two groups of the insulating slurry channels.

[0008] Preferably, there are at least two groups of electrode slurry channels, and the two groups of electrode slurry channels are arranged parallel to each other, each group of electrode slurry channels has an electrode slurry outlet, and the distance between the two groups of electrode slurry outlets is smaller than the distance between the electrode slurry outlet and the insulating slurry outlet.

[0009] Preferably, the electrode slurry channel comprises a first bending portion, a second bending portion and a connecting portion for connecting the first bending portion with the second bending portion, and the electrode slurry outlet is connected to the first bending portion.

[0010] Preferably, the insulating slurry channel is L-shaped.

[0011] Preferably, the upper gasket has an upper extension plate, an upper middle extension plate and an upper connecting plate, the upper extension plate and the upper middle extension plate are both located on the same side of the upper connecting plate, and an upper spacing groove is formed between the upper extension plate and the upper middle extension plate, the insulating slurry channel is located on the upper extension plate, and the electrode slurry channel is located on the upper middle extension plate.

[0012] Preferably, the lower gasket has a lower extension plate, a lower middle extension plate and a lower connecting plate, the lower extension plate and the lower middle extension plate are both located on the same side of the lower connecting plate, and a lower spacing groove is formed between the lower extension plate and the lower middle extension plate, the insulating slurry channel is located on the lower extension plate, the electrode slurry channel is located on the lower middle extension plate, the lower extension plate is opposite to the upper extension plate, the upper connecting plate is opposite to the lower connecting plate, and the lower middle extension plate is opposite to the upper middle extension plate.

[0013] Preferably, the side surfaces of the upper middle extension plate and the lower middle extension plate are both provided with thinning chamfers.

[0014] In the utility model, the proposed coating gasket, the upper gasket and the lower gasket are arranged in the die head, the insulating slurry is coated on the current collector through the insulating slurry channel, and the electrode slurry in the electrode slurry channel is coated on the electrode, thereby avoiding the mixing problem of the insulating slurry and the electrode slurry, reducing the scrapping of the pole pieces, improving the battery quality and improving the safety.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a side view of the utility model;

[0018] Figure 3 This is a schematic diagram of the upper gasket structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the lower gasket of the utility model;

[0020] In the figure: 1. upper gasket; 10. upper insulating groove; 11. upper electrode groove; 100. upper side extension plate; 101. upper middle extension plate; 102. upper connecting plate; 2. lower gasket; 20. lower insulating groove; 21. lower electrode groove; 200. lower side extension plate; 201. lower middle extension plate; 202. lower connecting plate; 3. electrode slurry discharge port; 4. insulating slurry discharge port; 5. first bending portion; 6. second bending portion; 7. connecting portion; 8. mounting hole; 9. thinning chamfer. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0022] like Figure 1-Figure 4 The coating gasket shown in the figure comprises an upper gasket 1 and a lower gasket 2, the upper gasket 1 and the lower gasket 2 are made of materials such as stainless steel, aluminum alloy, and hard alloy, the thickness of the upper gasket 1 and the lower gasket 2 is 0.3-2 mm, the upper gasket 1 is pasted on the lower gasket 2, the upper gasket 1 has an upper insulating groove 10 and an upper electrode groove 11, the lower gasket 2 has a lower insulating groove 20 and a lower electrode groove 21, the upper gasket 1 and the lower gasket 2 are stacked, the upper insulating groove 10 and the lower insulating groove 20 are relatively formed to form an insulating slurry channel, and the lower electrode groove 21 and the upper electrode groove 11 are relatively formed to form an electrical The width of the pole slurry channel, the upper insulating groove 10, the upper electrode groove 11, the lower insulating groove 20 and the lower electrode groove 21 is 3 to 10 mm, and the depth is 0.1 to 1.6 mm, that is, an insulating slurry channel and an electrode slurry channel are formed between the upper gasket 1 and the lower gasket 2, the insulating slurry channel has an insulating slurry outlet 4, and the electrode slurry channel has an electrode slurry outlet 3. The insulating slurry outlet 4 is far away from the middle of the upper gasket 1 and / or the lower gasket 2 relative to the electrode slurry outlet 3, and a coating interval is formed between the insulating slurry outlet 4 and the electrode slurry outlet 3. During the coating process, the insulating slurry is in the die head and coated on the collector through the insulating slurry channel. This insulating slurry coating method avoids the problem of mixing the insulating slurry and the electrode slurry, reduces the scrapping of pole pieces, improves battery quality, and improves safety.

[0023] The insulating slurry channel and the electrode slurry channel are respectively connected with the insulating slurry and the electrode slurry in the prior art so that the insulating slurry is discharged from the insulating discharge port and the electrode slurry is discharged from the electrode discharge port.

[0024] Preferably, the insulating slurry outlet 4 is away from the middle of the upper gasket 1 relative to the electrode slurry outlet 3, that is, the insulating slurry outlet 4 is located on the side of the upper gasket 1, and the electrode slurry outlet 3 is located in the middle of the gasket.

[0025] In order to improve the coating efficiency, preferably, two groups of insulating slurry channels are provided, one group of insulating slurry channels is located on one side of the upper gasket 1 and / or the lower gasket 2, the other group of insulating slurry channels is located on the other side of the upper gasket 1 and / or the lower gasket 2, and the electrode slurry channel is located between the two groups of insulating slurry channels.

[0026] In order to improve the coating efficiency, preferably, there are at least two groups of electrode slurry channels, and the two groups of electrode slurry channels are arranged parallel to each other, each group of electrode slurry channels has an electrode slurry outlet 3, and the distance between the two groups of electrode slurry outlets 3 is smaller than the distance between the electrode slurry outlet 3 and the insulating slurry outlet 4.

[0027] In order to improve the coating efficiency, preferably, the electrode slurry channel includes a first bending portion 5, a second bending portion 6 and a connecting portion 7 for connecting the first bending portion 5 and the second bending portion 6, the electrode slurry outlet 3 is connected to the first bending portion 5, and the first bending portion 5 and the second bending portion 6 are both perpendicular to the connecting portion 7 and located on the same side of the connecting portion 7.

[0028] Preferably, the insulating slurry channel is L-shaped.

[0029] Preferably, the upper gasket 1 has an upper extension plate 100, an upper middle extension plate 101 and an upper connecting plate 102, the upper extension plate 100 and the upper middle extension plate 101 are both located on the same side of the upper connecting plate 102, and an upper spacing groove is formed between the upper extension plate 100 and the upper middle extension plate 101, the insulating slurry channel is located on the upper extension plate 100, the electrode slurry channel is located on the upper middle extension plate 101, two groups of upper extension plates 100 are provided and the upper middle extension plate 101 is located between the two groups of upper extension plates 100, the upper insulating groove 10 is opened on the upper extension plate 100, the upper electrode groove 11 is opened on the upper middle extension plate 101, and the upper connecting plate 102 is provided with a mounting hole 8.

[0030] Preferably, the lower gasket 2 has the same structure as the upper gasket 1. The lower gasket 2 has a lower extension plate 200, a lower middle extension plate 201 and a lower connecting plate 202. The lower extension plate 200 and the lower middle extension plate 201 are both located on the same side of the lower connecting plate 202. The lower insulation groove 20 is opened on the lower extension plate 200, and the lower electrode groove 21 is opened on the lower middle extension plate 201. The lower connecting plate 202 is provided with a mounting hole 8, and a lower spacing groove is formed between the lower extension plate 200 and the lower middle extension plate 201. The insulating slurry channel is located on the lower extension plate 200, and the electrode slurry channel is located on the lower middle extension plate 201. The lower extension plate 200 is opposite to the upper extension plate 100, the upper connecting plate 102 is opposite to the lower connecting plate 202, and the lower middle extension plate 201 is opposite to the upper middle extension plate 101.

[0031] In order to facilitate the scraping of the electrode coating, preferably, the side surfaces of the upper middle extension plate 101 and the lower middle extension plate 201 are both provided with thinning chamfers 9 .

[0032] External fixing structures 12 are provided on the outer sides of the upper pad 1 and the lower pad 2 .

[0033] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coated gasket, characterized in that: The invention comprises an upper gasket (1) and a lower gasket (2), wherein an insulating slurry channel and an electrode slurry channel are formed between the upper gasket (1) and the lower gasket (2), wherein the insulating slurry channel has an insulating slurry outlet (4), and the electrode slurry channel has an electrode slurry outlet (3), wherein the insulating slurry outlet (4) is away from the middle of the upper gasket (1) and / or the lower gasket (2) relative to the electrode slurry outlet (3), and a coating interval is formed between the insulating slurry outlet (4) and the electrode slurry outlet (3).

2. The coated gasket according to claim 1, characterized in that: The insulating slurry outlet (4) is located away from the middle of the upper gasket (1) relative to the electrode slurry outlet (3).

3. The coated gasket according to claim 1, characterized in that: The insulating slurry channels are provided with two groups, one group of the insulating slurry channels is located on one side of the upper gasket (1) and / or the lower gasket (2), the other group of the insulating slurry channels is located on the other side of the upper gasket (1) and / or the lower gasket (2), and the electrode slurry channels are located between the two groups of the insulating slurry channels.

4. The coated gasket according to claim 3, characterized in that: The electrode slurry channels have at least two groups, and the two groups of electrode slurry channels are arranged parallel to each other, each group of electrode slurry channels has an electrode slurry outlet (3), and the distance between the two groups of electrode slurry outlets (3) is smaller than the distance between the electrode slurry outlet (3) and the insulating slurry outlet (4).

5. The coated gasket according to claim 1, characterized in that: The electrode slurry channel comprises a first bending portion (5), a second bending portion (6) and a connecting portion (7) for connecting the first bending portion (5) and the second bending portion (6), and the electrode slurry outlet (3) is connected to the first bending portion (5).

6. The coated gasket according to claim 1, characterized in that: The insulating slurry channel is L-shaped.

7. The coated gasket according to claim 1, characterized in that: The upper gasket (1) comprises an upper extension plate (100), an upper middle extension plate (101) and an upper connecting plate (102); the upper extension plate (100) and the upper middle extension plate (101) are both located on the same side of the upper connecting plate (102); an upper spacing groove is formed between the upper extension plate (100) and the upper middle extension plate (101); the insulating slurry channel is located on the upper extension plate (100); and the electrode slurry channel is located on the upper middle extension plate (101).

8. The coated gasket according to claim 7, characterized in that: The lower gasket (2) comprises a lower extension plate (200), a lower middle extension plate (201) and a lower connecting plate (202); the lower extension plate (200) and the lower middle extension plate (201) are both located on the same side of the lower connecting plate (202); a lower spacing groove is formed between the lower extension plate (200) and the lower middle extension plate (201); the insulating slurry channel is located on the lower extension plate (200); the electrode slurry channel is located on the lower middle extension plate (201); the lower extension plate (200) is opposite to the upper extension plate (100); the upper connecting plate (102) is opposite to the lower connecting plate (202); and the lower middle extension plate (201) is opposite to the upper middle extension plate (101).

9. The coated gasket according to claim 8, characterized in that: The side surfaces of the upper middle extension plate (101) and the lower middle extension plate (201) are both provided with thinning chamfers (9).

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