Inkjet Printing Process of the Protective Layer of the Upper Cover of a Lithium-Ion Battery

Abstract

Disclose the inkjet printing process of the protective layer of the upper cover of the lithium-ion battery. 【Solution means】The inkjet printing area is divided into a first inkjet printing area and a second inkjet printing area, and combined with a misting guard having a specially designed inkjet printing window for blanking, realizing inkjet printing at the positions where inkjet printing of ink is required. At the same time, it is possible to avoid the misting being sputtered on non-inkjet printing parts such as the positive and negative electrodes, liquid injection holes, QR code areas, etc. of the upper cover of the lithium-ion battery.

Description

Technical Field

[0001] The present invention relates to an inkjet printing process, and particularly to an inkjet printing process for a protective layer of a lithium-ion battery upper cover.

Background Art

[0002] On the upper cover of a lithium-ion battery, parts such as positive and negative electrodes, liquid injection holes, and QR code (registered trademark) areas are installed. Since these parts cannot be inkjet printed with ink, when performing inkjet printing, it is necessary to avoid these parts and perform inkjet printing. However, during the inkjet printing operation of the head, ink may splash (commonly referred to as misting). If the forming process of the protective film is carried out in the direct inkjet printing process, some ink splashes onto these parts, causing processing defects and ultimately affecting the quality of the lithium-ion battery. Therefore, it is necessary to design an inkjet printing process for the protective layer of the lithium-ion battery upper cover, accurately inkjet print the positions where inkjet printing of ink is required, and at the same time avoid misting from being sputtered onto non-inkjet printing parts such as the positive and negative electrodes, liquid injection holes, and QR code areas of the lithium-ion battery upper cover.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of the above deficiencies, the object of the present invention is to provide an inkjet printing process for a protective layer of a lithium-ion battery upper cover, inkjet print the positions where inkjet printing of ink is required, and at the same time avoid misting from being sputtered onto non-inkjet printing parts such as the positive and negative electrodes, liquid injection holes, and QR code areas of the lithium-ion battery upper cover.

Means for Solving the Problems

[0004] As a technical solution adopted in the present invention, it is an inkjet printing process for a protective layer of a lithium-ion battery upper cover including the upper cover of a lithium-ion battery waiting for inkjet printing. The width of the end face of the upper cover of the lithium-ion battery is W, the length is L, and a non-inkjet printing area is provided on the end face of the upper cover of the lithium-ion battery. The distance from the lower side of the end face of the upper cover of the lithium-ion battery to the lower side of the non-inkjet printing area is H, and the distance from the upper side of the end face of the upper cover of the lithium-ion battery to the upper side of the non-inkjet printing area is also H. The following steps are included.

[0005] 1) Divide the inkjet printing area on the end face of the upper cover of the lithium-ion battery into a first inkjet printing area and a second inkjet printing area. Here, the first inkjet printing area is a rectangular area from the lower side of the end face of the upper cover of the lithium-ion battery to the lower side of the non-inkjet printing area. The length of the rectangular area is L, the width is H, and the inkjet printing area is the remaining part except the first inkjet printing area, which is the second inkjet printing area.

[0006] 2) Install a misting guard. On the misting guard, a blank inkjet printing window is installed. The width of the inkjet printing window is W + 0.1 to 1 mm, the length is L, and the shape conforms to the end face shape of the upper cover of the lithium-ion battery. On the misting guard, a misting stopper block corresponding to the non-inkjet printing part of the upper cover of the lithium-ion battery is installed. The misting stopper block protrudes into the inkjet printing window from below the inkjet printing window and there is a gap between it and the upper side of the inkjet printing window. The width of the gap is H + 0.1 to 1 mm. Between the upper side of the inkjet printing window and the upper edge of the misting stopper block, a first inkjet printing window corresponding to the first inkjet printing area is formed. The first inkjet printing window is a rectangular area with a length of L and a width of H + 0.1 to 1 mm. Except for the first inkjet printing window, the rest of the inkjet printing window is the second inkjet printing window.

[0007] 3) Install the misting guard above the end face of the upper cover of the lithium-ion battery. By aligning the upper side of the inkjet printing window with the lower side of the non-inkjet printing part, the first inkjet printing window of the misting guard is made to correspond to the first inkjet printing area of the end face of the upper cover of the lithium-ion battery. Here, the first inkjet printing window is 0.1 to 1 mm wider than the first inkjet printing area (that is, the edge of the misting stopper block is lower than the lower side of the end face of the upper cover of the lithium-ion battery, so that the fillet transition position of the lower edge of the end face of the upper cover of the lithium-ion battery is fully inkjet printed, avoiding the situation of inkjet printing leakage at the corner transition position), and the first inkjet printing area of the end face of the upper cover of the lithium-ion battery is inkjet printed.

[0008] 4) After completing the inkjet printing on the first inkjet printing area on the end face of the upper cover of the lithium-ion battery, by moving the misting guard, the upper edge of the misting stopper block is aligned above the non-inkjet printing area, so that the second inkjet printing window of the misting guard corresponds to the second inkjet printing area on the end face of the upper cover of the lithium-ion battery. Here, the second inkjet printing window is 0.1 to 1 mm wider than the second inkjet printing area (that is, the upper side of the inkjet printing window is higher than the upper side of the end face of the upper cover of the lithium-ion battery, so that the circular transition position of the upper edge of the end face of the upper cover of the lithium-ion battery is fully inkjet printed, avoiding the situation of inkjet printing leakage at the corner transition position), and the second inkjet printing area on the end face of the upper cover of the lithium-ion battery is inkjet printed.

[0009] Furthermore, the non-inkjet printing areas provided on the end face of the upper cover of the lithium-ion battery include two or more spaced apart from each other, and the misting stopper blocks corresponding to the non-inkjet printing areas of the upper cover of the lithium-ion battery provided on the misting guard also include two or more spaced apart from each other.

[0010] Furthermore, the non-inkjet printing areas provided on the end face of the upper cover of the lithium-ion battery include five spaced apart from each other, which are a positive electrode area, a liquid injection hole area, a central area, a QR code area and a negative electrode area respectively, and the misting stopper blocks corresponding to the non-inkjet printing areas of the upper cover of the lithium-ion battery provided on the misting guard also include five spaced apart from each other, which are a positive electrode misting stopper block, a liquid injection hole misting stopper block, a central misting stopper block, a QR code misting stopper block and a negative electrode misting stopper block respectively.

[0011] Furthermore, the non-inkjet printing areas provided on the end face of the upper cover of the lithium-ion battery are flat non-inkjet printing areas, protruding non-inkjet printing areas or concave-fitting non-inkjet printing areas.

[0012] Furthermore, the mixing stopper block has a rectangular structure.

[0013] Furthermore, in step 2), the length of the inkjet printing window is L + 0.1 to 1 mm, the length of the first inkjet printing window is L + 0.1 to 1 mm. In step 3), there is a slight gap between the left side of the first inkjet printing window and the left side of the first inkjet printing area, and there is a slight gap between the right side of the first inkjet printing window and the right side of the first inkjet printing area. Overall, the first inkjet printing window is 0.1 to 1 mm longer than the first inkjet printing area. In step 4), there is a slight gap between the left side of the second inkjet printing window and the left side of the second inkjet printing area, and there is a slight gap between the right side of the second inkjet printing window and the right side of the second inkjet printing area. Overall, the second inkjet printing window is 0.1 to 1 mm longer than the second inkjet printing area.

Advantages of the Invention

[0014] The present invention has the following advantages. It divides the inkjet printing area into a first inkjet printing area and a second inkjet printing area, and is combined with a misting guard having a specially designed cut-out inkjet printing window, realizing inkjet printing at the positions where inkjet printing of ink is required. At the same time, it can avoid the misting being sputtered onto non-inkjet printing parts such as the positive and negative electrodes, liquid injection holes, QR code areas, etc. of the upper cover of the lithium-ion battery. The width of the inkjet printing window of the misting guard is slightly wider than the width of the end face of the upper cover of the lithium-ion battery, and is combined with a misting stopper block, and is divided into a first inkjet printing window and a second inkjet printing window according to the purpose. When inkjet printing the first inkjet printing area, due to the reserved width, the corner transition position below the end face of the upper cover of the lithium-ion battery can be better covered by inkjet printing. When inkjet printing the second inkjet printing area, the misting stopper block can effectively stop the non-inkjet printing parts, and due to the reserved width, the corner transition position below the end face of the upper cover of the lithium-ion battery can be well covered by inkjet printing. The upper and lower transition positions of the end face of the upper cover of the lithium-ion battery have fillets, and whether they are fully inkjet printed affects the overall inkjet printing quality of the lithium-ion battery. However, the patent of the present invention uses a specially designed misting guard to optimize the process, which can avoid the misting being sputtered onto non-inkjet printing parts, and ensure that the fillet transition positions on the upper and lower sides of the end face of the upper cover of the lithium-ion battery are fully inkjet printed.

[0015] Hereinafter, the present invention will be further described in conjunction with the description of the accompanying drawings and specific embodiments.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0017] Hereinafter, the technical solutions in the embodiments of this utility model will be clearly and completely described with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of this utility model.

[0018] If there are direction indications (up, down, left, right, front, back, upper, lower, inside, outside, vertical, horizontal, longitudinal direction, counterclockwise, clockwise, circumferential direction, radial direction, axial direction, etc.) in the embodiments of this utility model, it should be noted that the direction indications are only used to explain the relative positional relationship and movement status between components in a specific posture (as shown in the drawings), and when the specific posture changes, the direction indications will change accordingly.

[0019] Also, in the embodiments of the present utility model, if there is a description including "first" or "second", the description of "first" or "second" is for the purpose of explanation and should not be construed as indicating relative importance, suggesting, or implying the number of the indicated technical features. Therefore, the features limited as "first" or "second" can explicitly or implicitly include at least one of these features. In addition, although the technical solutions of each embodiment can be combined with each other, it must be based on what can be realized by those skilled in the art. If the combination of technical solutions is contradictory or cannot be realized, such a combination of technical solutions does not exist and should not be considered within the protection scope required by the present utility model.

[0020] Referring to FIGS. 1 to 6, the protection layer inkjet printing process of the upper cover of the lithium-ion battery according to this embodiment includes the upper cover 1 of the lithium-ion battery waiting for inkjet printing.

[0021] The width of the end face of the upper cover 1 of the lithium-ion battery is W, the length is L, and a non-inkjet printing site is provided on the end face of the upper cover of the lithium-ion battery. The non-inkjet printing sites provided on the end face of the upper cover of the lithium-ion battery include five spaced apart from each other, namely the positive electrode site 11, the liquid injection hole site 12, the central site 13, the QR code site 14, and the negative electrode site 15. In addition, generally, the lithium-ion battery is a rectangular parallelepiped, but the end face of the upper cover of the lithium-ion battery is rectangular. The upper, lower, left, and right sides (i.e., the transfer edges between surfaces) of the end face of the upper cover of the lithium-ion battery have a transition angle 16. In particular, the transition angles on the upper and lower sides generally undergo a fillet transition treatment and have a certain arc surface structure. Since it is easy to occur a situation where the inkjet printing is insufficient, appropriate over-inkjet printing is performed during inkjet printing to ensure that the corner transition position is sufficiently protected by inkjet printing.

[0022] The distance from the lower side of the end face of the upper cover 1 of the lithium-ion battery to the lower side of the non-inkjet printing area is H, and the distance from the upper side of the end face of the upper cover of the lithium-ion battery to the upper side of the non-inkjet printing area is also H. In addition, when the widths of a plurality of non-inkjet printing areas are different, that is, when the distances from the upper side of the end face of the upper cover of the lithium-ion battery are different, based on the non-inkjet printing area with the largest width, that is, the distance from the lower side of the end face of the upper cover of the lithium-ion battery to the lower side of the non-inkjet printing area with the largest width is H, and the distance from the upper side of the end face of the upper cover of the lithium-ion battery to the upper side of the non-inkjet printing area with the largest width is also H.

[0023] Specifically, it includes the following steps.

[0024] 1) Divide the inkjet printing area on the end face of the upper cover 1 of the lithium-ion battery into a first inkjet printing area 17 and a second inkjet printing area 18. Here, the first inkjet printing area 17 is a rectangular area from the lower side of the end face of the upper cover of the lithium-ion battery to the lower side of the non-inkjet printing area. The length of the rectangular area is L, the width is H, and the inkjet printing area, excluding the first inkjet printing area 17, is the second inkjet printing area 18.

[0025] 2) Install the misting guard 2. On the misting guard 2, a blank inkjet printing window 21 is installed. The width of the inkjet printing window 21 is W + 0.1 to 1 mm, the length is L, and the shape conforms to the end face shape of the upper cover 1 of the lithium-ion battery. On the misting guard 2, misting stopper blocks 22 corresponding to the non-inkjet printing parts of the upper cover 1 of the lithium-ion battery are installed. The misting stopper blocks 22 protrude into the inkjet printing window 21 from the lower side of the inkjet printing window, and there is a gap 23 between the misting stopper blocks 22 and the upper side of the inkjet printing window 21. The width of the gap 23 is H + 0.1 to 1 mm. The misting stopper blocks corresponding to the non-inkjet printing parts of the upper cover of the lithium-ion battery installed on the misting guard 2 also include five spaced-apart ones, namely the positive electrode misting stopper block, the liquid injection hole misting stopper block, the central misting stopper block, the QR code misting stopper block, and the negative electrode misting stopper block. Between the upper side of the inkjet printing window 21 and the upper edge of the misting stopper block 22, a first inkjet printing window corresponding to the first inkjet printing area is formed. The first inkjet printing window is a rectangular area with a length of L and a width of H + 0.1 to 1 mm. Except for the first inkjet printing window, the remaining part of the inkjet printing window is the second inkjet printing window.

[0026] Note that the reason for designing the width of the inkjet printing window to be W + 0.1 to 1 mm is to provide a basis for ensuring that the corner transition positions on the upper and lower sides of the end face of the battery's upper cover are sufficiently inkjet printed.

[0027] 3) Install the misting guard 2 above the end face of the upper cover 1 of the lithium-ion battery, and align the upper side of the inkjet printing window with the lower side of the non-inkjet printing area. In this way, the first inkjet printing window of the misting guard 2 is made to correspond to the first inkjet printing area 17 of the end face of the upper cover 1 of the lithium-ion battery. Here, the first inkjet printing window is 0.1 to 1 mm wider than the first inkjet printing area 17, that is, the edge of the misting stopper block 22 is lower than the lower side (with a gap) of the end face of the upper cover 1 of the lithium-ion battery, so that the fillet transition position of the lower edge of the end face of the upper cover of the lithium-ion battery is fully inkjet printed (over-inkjet printing can be performed), avoiding the situation of inkjet printing leakage at the corner transition position. Then, inkjet print the first inkjet printing area of the end face of the upper cover of the lithium-ion battery, ensuring that the inkjet printing area is slightly larger than the area of the first inkjet printing area, and the lower corner transition position is fully inkjet printed.

[0028] 4) After completing the inkjet printing on the first inkjet printing area 17 on the end face of the upper lid 1 of the lithium-ion battery, by moving the misting guard 2, the upper edge of the misting stopper block is aligned above the non-inkjet printing area, so that the second inkjet printing window of the misting guard 2 corresponds to the second inkjet printing area 18 on the end face of the upper lid 1 of the lithium-ion battery. Here, the second inkjet printing window is 0.1 to 1 mm wider than the second inkjet printing area 18, that is, the upper side of the inkjet printing window is higher than the upper side (with a gap) of the end face of the upper lid of the lithium-ion battery, so that the fillet transition position of the upper edge of the end face of the upper lid of the lithium-ion battery is fully inkjet printed (can be over-inkjet printed), avoiding the situation of inkjet printing leakage at the corner transition position. Then, the second inkjet printing area on the end face of the upper lid of the lithium-ion battery is inkjet printed. The area of the inkjet printing is such that the area of the second inkjet printing window is slightly larger than the area of the second inkjet printing area, ensuring that the upper corner transition position is fully inkjet printed.

[0029] Specifically, in some embodiments, the non-inkjet printing area provided on the end face of the upper lid 1 of the lithium-ion battery is a flat non-inkjet printing area, a protruding non-inkjet printing area, or a concave-fitting non-inkjet printing area.

[0030] Specifically, the misting stopper block 22 has a rectangular structure. Note that the shape of the non-inkjet printing site is not necessarily rectangular. For example, in the case of a liquid injection hole, the rectangular misting stopper block can basically satisfy the misting stoppers of non-inkjet printing sites of all shapes. However, when the shape of this non-inkjet printing site is not rectangular or the width is slightly smaller than that of the misting stopper block with a rectangular structure, there are some places that are not sprayed at the edge position of this non-inkjet printing site due to excessive shielding. If the area of these non-inkjet-printable places can be suppressed within a relatively small range, it is acceptable. Of course, it is preferable that the shape of the misting stopper block conforms to the shape of the non-inkjet printing site.

[0031] Specifically, in step 2), the length of the inkjet printing window 21 is L + 0.1 to 1 mm, and the length of the first inkjet printing window is L + 0.1 to 1 mm. In step 3), there is a slight gap between the left side of the first inkjet printing window and the left side of the first inkjet printing area, and there is a slight gap between the right side of the first inkjet printing window and the right side of the first inkjet printing area. Overall, the first inkjet printing window is 0.1 to 1 mm longer than the first inkjet printing area. In step 4), there is a slight gap between the left side of the second inkjet printing window and the left side of the second inkjet printing area, and there is a slight gap between the right side of the second inkjet printing window and the right side of the second inkjet printing area. Overall, the second inkjet printing window is 0.1 to 1 mm longer than the second inkjet printing area. In some specific embodiments, it does not exclude that there are fillet transition positions on the left and right sides of the end face of the upper cover of the lithium-ion battery, and sufficient inkjet printing is also required at these positions. Therefore, by reserving 0.1 to 1 mm more for the length of the inkjet printing window, gaps can be formed on both the left and right sides, providing a basis for sufficient inkjet printing.

[0032] The present invention is not limited to the above embodiments, and other inkjet printing processes for the protective layer of the upper cover of a lithium-ion battery obtained by adopting the same or similar technical features as those of the above examples of the present invention are all within the protection scope of the present invention.

Explanation of Signs

[0033] 1 Upper cover of lithium-ion battery 11 Positive electrode part 12 Liquid injection hole part 13 Central part 14 QR code part 15 Negative electrode part 16 Transition angle 17 First inkjet printing area 18 Second inkjet printing area 2 Mixing guard 21 Inkjet printing window 22 Mixing stopper block 23 Gap

Claims

1. An inkjet printing process for a protective layer of a lithium-ion battery upper cover including the upper cover of a lithium-ion battery awaiting inkjet printing, wherein the width of the end face of the upper cover of the lithium-ion battery is W, the length is L, and a non-inkjet printing area is provided on the end face of the upper cover of the lithium-ion battery. The distance from the lower side of the end face of the upper cover of the lithium-ion battery to the lower side of the non-inkjet printing area is H, and the distance from the upper side of the end face of the upper cover of the lithium-ion battery to the upper side of the non-inkjet printing area is also H. 1) A step of dividing the inkjet printing area on the end face of the upper cover of the lithium-ion battery into a first inkjet printing area and a second inkjet printing area. The first inkjet printing area is a rectangular area from the lower side of the end face of the upper cover of the lithium-ion battery to the lower side of the non-inkjet printing area. The length of the rectangular area is L and the width is H. The inkjet printing area, excluding the first inkjet printing area, is the second inkjet printing area. 2) A step of installing a misting guard. The misting guard is provided with an inkjet printing window for extraction. The width of the inkjet printing window is W + 0.1 to 1 mm, the length is L, and the shape conforms to the shape of the end face of the upper cover of the lithium-ion battery. The misting guard is provided with a misting stopper block corresponding to the non-inkjet printing area of the upper cover of the lithium-ion battery. The misting stopper block protrudes into the inkjet printing window from the lower side of the inkjet printing window, and there is a gap between the upper side of the inkjet printing window. The width of the gap is H + 0.1 to 1 mm. A first inkjet printing window corresponding to the first inkjet printing area is formed between the upper side of the inkjet printing window and the upper edge of the misting stopper block. The first inkjet printing window is a rectangular area with a length of L and a width of H + 0.1 to 1 mm. The inkjet printing window, excluding the first inkjet printing window, is the second inkjet printing window. (3) Install the misting guard above the end face of the upper cover of the lithium-ion battery, and align the upper side of the inkjet printing window with the lower side of the non-inkjet printing area, so that the first inkjet printing window of the misting guard corresponds to the first inkjet printing area of the end face of the upper cover of the lithium-ion battery. The first inkjet printing window is 0.1 to 1 mm wider than the first inkjet printing area, and the step of inkjet printing the first inkjet printing area of the end face of the upper cover of the lithium-ion battery, (4) After completing the inkjet printing on the first inkjet printing area of the end face of the upper cover of the lithium-ion battery, move the misting guard, and align the upper edge of the misting stopper block with the upper side of the non-inkjet printing area, so that the second inkjet printing window of the misting guard corresponds to the second inkjet printing area of the end face of the upper cover of the lithium-ion battery. The second inkjet printing window is 0.1 to 1 mm wider than the second inkjet printing area, and the step of inkjet printing the second inkjet printing area of the end face of the upper cover of the lithium-ion battery, which includes the above steps, is characterized in that it is a protection layer inkjet printing process for the upper cover of a lithium-ion battery.

2. The non-inkjet printing areas provided on the end face of the upper cover of the lithium-ion battery include two or more spaced apart from each other, and the misting stopper blocks corresponding to the non-inkjet printing areas of the upper cover of the lithium-ion battery provided on the misting guard also include two or more spaced apart from each other. The protection layer inkjet printing process for the upper cover of a lithium-ion battery according to claim 1, characterized in that.

3. The non-inkjet printing parts installed on the end face of the upper cover of the lithium-ion battery include five parts spaced apart from each other, which are the positive electrode part, the liquid injection hole part, the central part, the QR code part and the negative electrode part respectively. The misting stopper blocks corresponding to the non-inkjet printing parts of the upper cover of the lithium-ion battery installed on the misting guard also include five parts spaced apart from each other, which are the positive electrode misting stopper block, the liquid injection hole misting stopper block, the central misting stopper block, the QR code misting stopper block and the negative electrode misting stopper block respectively. The inkjet printing process of the protective layer of the upper cover of the lithium-ion battery according to claim 2, characterized in that.

4. The non-inkjet printing part installed on the end face of the upper cover of the lithium-ion battery is a flat non-inkjet printing part, a protruding non-inkjet printing part or a concave-fitting non-inkjet printing part. The inkjet printing process of the protective layer of the upper cover of the lithium-ion battery according to claim 1, characterized in that.

5. The misting stopper block has a square structure. The inkjet printing process of the protective layer of the upper cover of the lithium-ion battery according to claim 1, characterized in that.

6. In step 2), the length of the inkjet printing window is L + 0.1 to 1 mm, and the length of the first inkjet printing window is L + 0.1 to 1 mm. In step 3), there is a slight gap between the left side of the first inkjet printing window and the left side of the first inkjet printing area, and there is a slight gap between the right side of the first inkjet printing window and the right side of the first inkjet printing area. Overall, the first inkjet printing window is 0.1 to 1 mm longer than the first inkjet printing area. In step 4), there is a slight gap between the left side of the second inkjet printing window and the left side of the second inkjet printing area, and there is a slight gap between the right side of the second inkjet printing window and the right side of the second inkjet printing area. Overall, the second inkjet printing window is 0.1 to 1 mm longer than the second inkjet printing area. The inkjet printing process of the protective layer of the upper cover of the lithium-ion battery according to claim 1, characterized in that.

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