New grid belt

Abstract

The present invention relates to the field of battery production and discloses a novel grid mesh belt, which is formed by horizontally connecting two rows of multiple grids (1) connected in series. The pole ears (2) of the two rows of grids (1) connected in series are arranged on the outside of the structure in opposite directions. The grid bottom frames (3) of the two rows of grids (1) connected in series are arranged on the inside of the structure in opposite directions, and the two oppositely arranged grid bottom frames are connected by a connecting block (4). The grid bottom frames (3) connected to the connecting block (4) are provided with a cutting avoidance groove (5), and the two ends of the connecting block (4) are respectively connected to the inner walls of the cutting avoidance groove (5) on the two grid bottom frames (3) arranged in opposite directions. Compared with the prior art, the present invention effectively improves product quality and qualified rate by rationally designing the arrangement and connection structure of the grids on the grid mesh belt, thereby achieving cost reduction and efficiency improvement.

Description

Technical Field

[0001] The present invention relates to the field of battery production, and in particular to a novel grid mesh belt. Background Art

[0002] The grid is a key component of the battery, carrying the active material and transmitting the current. With the rapid development of science and technology, the traditional semi-mechanized casting grid will gradually be replaced by continuous casting and rolling technology. In most of the current continuous casting and rolling processes, the grid mesh belt consists of two rows of grids 1 connected in series. The tabs 2 of each grid 1 in the two rows of grids 1 are staggered relative to each other on the inner side of the grid mesh belt, such as Figure 1 As shown, the bottom frames 3 of the two rows of grids 2 are arranged on the outside of the grid mesh belt facing each other. This grid mesh belt structure has the following defects:

[0003] (1) When it is necessary to apply lead paste on each grid 1 in the grid mesh belt except for the position of the pole lug 2, since the pole lugs 2 of the two rows of grids 1 are relatively arranged on the inner side of the grid mesh belt, it is inevitable that the lead paste will be squeezed onto each pole lug 2 when applying the lead paste. Once the lead paste sticks to the pole lug 2, it is difficult to brush the pole lug 2 clean, which will seriously affect the welding quality of the grid lug in the subsequent process.

[0004] (2) When the relatively staggered tabs 2 are cut, the connection points between the tabs 2 and the grid frame will always leave some tab residue on the grid frame when they are cut off, which will cause burrs on the grid frame. Subsequently, a very thin battery separator will be wrapped around the outside of the grid. The above-mentioned burrs can easily scratch the battery separator and cause a short circuit between the positive and negative electrodes, affecting product quality and even battery failure. Summary of the Invention

[0005] Purpose of the invention: In response to the problems existing in the prior art, the present invention provides a new type of grid mesh belt, which effectively improves product quality and pass rate by rationally designing the arrangement and connection structure of the grids on the grid mesh belt, thereby achieving cost reduction and efficiency improvement.

[0006] Technical solution: The present invention provides a new type of grid mesh belt, which is composed of two rows of multiple grids connected in series horizontally, and the pole ears of the two rows of grids connected in series are arranged back to back on the outside of the structure; the grid bottom frames of the two rows of grids connected in series are relatively arranged on the inside of the structure, and the two relatively arranged grid bottom frames are connected by a connecting block; a cutting avoidance groove is provided at the position of the grid bottom frame connected to the connecting block, and the two ends of the connecting block are respectively connected to the inner walls of the cutting avoidance groove on the two relatively staggered grid bottom frames.

[0007] Furthermore, a convex edge adapted to the cutting avoidance groove is provided inside the grid at a position opposite to the cutting avoidance groove at the bottom frame of the grid. In order to ensure that the width of the bottom frame of the grid remains unchanged, a convex edge is provided inside the grid corresponding to the position of the cutting avoidance groove.

[0008] Preferably, the depth d of the cutting avoidance groove is 0.8 mm to 1.2 mm.

[0009] Preferably, the upper and lower heights of the two ends of the connecting block are unequal. If the connecting block is a long strip with equal heights at both ends, the roller cutters at both ends cut it simultaneously when separating it from the upper and lower grid bottom frames. In this way, when the two ends of the connecting block are cut simultaneously, it is easy for the cut connecting block to be stuck between the two roller cutters, affecting the smooth progress of subsequent cutting. Therefore, in the present invention, the grid bottom frames of two columns of series grids are connected by connecting blocks with unequal heights at both ends. In this way, when the grid mesh belt is fed along the grid smear feeding direction, the roller cutters used to cut the two ends of the connecting block first cut the connection point between the higher end of the connecting block and the grid bottom frame of one column, and then cut the connection point between the lower end of the connecting block and the grid bottom frame of the other column. Since the connection points of the two ends of the connecting block and the two grid bottom frames are not cut simultaneously, the defect of the cut connecting block being stuck between the two cutters due to simultaneous cutting can be effectively avoided, so that subsequent cutting can be carried out smoothly.

[0010] Furthermore, the ends of two adjacent connecting blocks are staggered in height. This means that if the upper end of the previous connecting block is connected to the lower part of the upper grid bottom frame and the lower end is connected to the upper part of the lower grid bottom frame, then the upper end of the next connecting block is designed to be connected to the upper part of the upper grid bottom frame and the lower end is designed to be connected to the lower part of the lower grid bottom frame. Because the ends of the connecting blocks are of different heights, the thickness of the ends of the connecting blocks needs to be thinner than the thickness of the grid bottom frame, and the strength may be lower. In the present invention, the staggered design of the ends of two adjacent connecting blocks can improve the strength of the entire connecting block.

[0011] Preferably, the connecting block is a "Z"-shaped structure. This structure allows the cutting blade to sequentially cut the connection points between the connecting block and the upper and lower rows of grids along the grid smear feed line. Compared with a straight connecting block, this structure effectively prevents the connecting block from being stuck between the two cutting blades after the cutting blade simultaneously cuts off the connection points on both sides, thus affecting the smooth progress of the subsequent cutting process.

[0012] Preferably, the thickness of the connecting block does not exceed 1 / 2 of the thickness of the bottom frame of the grid. Only when the thickness of the connecting block does not exceed 1 / 2 of the thickness of the bottom frame of the grid can the roller cutter ensure that the connecting ends of the connecting block are cut at different times, effectively avoiding the problem of the roller cutter getting stuck.

[0013] Furthermore, the tabs of the two series-connected grids are connected and fixed by connecting bars. Without the connecting bars, the tabs of the two grids would be suspended in the air, which could easily cause the tabs to deform. In the present invention, the tabs of the two grids are connected by connecting bars, which can act as reinforcement ribs and effectively prevent deformation of the grids or tabs. The connecting bars can be removed during subsequent cutting.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0015] (1) Arranging the tabs of the two series-connected grids on the outside of the grid mesh belt can effectively prevent the lead paste from being squeezed onto the tabs of the grids on both sides when applying lead paste on the grids.

[0016] (2) The setting of the cutting avoidance groove in the present invention can hide the burrs generated in the cutting avoidance groove. In this way, when the battery separator is subsequently wrapped as a whole on the outside of the grid, the residual burrs in the cutting avoidance groove will not directly contact the battery separator, which can effectively prevent the quality problem of the battery separator being scratched due to the residual burrs.

[0017] (3) The grid mesh belt structure of the present invention can effectively avoid problems such as grid deformation, carding during slicing, and excess paste on the tabs that occur during the production process, greatly reducing the scrap rate of the grid and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a new type of grid belt in the prior art;

[0019] Figure 2 Schematic diagram of the new grid belt in embodiment 1;

[0020] Figure 3 for Figure 2 Schematic diagram of the enlarged structure in the middle circle A;

[0021] Figure 4 This is a diagram showing the orientation of the smear feeding and rolling cutting mechanism and the new grid mesh belt in embodiment 1;

[0022] Figure 5 for Figure 2 Cross-sectional view along the AA plane;

[0023] Figure 6 for Figure 2 Cross-sectional view along the BB plane;

[0024] Figure 7 Schematic diagram of the new grid belt in Implementation Method 3;

[0025] Figure 8 This is an orientation diagram of the smear feeding rolling cutting mechanism and the new grid mesh belt in implementation mode 3. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings.

[0027] Implementation method 1:

[0028] This embodiment provides a new type of grid belt, such as Figure 2 and 3 As shown, it is composed of two rows of multiple grids 1 connected in series horizontally, and the pole ears 2 of the two rows of grids 1 are arranged back to back on the outside of the structure; the grid bottom frames 3 of the two rows of grids 1 are arranged relatively on the inside of the structure, and the two relatively arranged grid bottom frames are connected by a "Z"-shaped connecting block 4 with unequal heights at both ends. The grid bottom frame 3 connected to the connecting block 4 is provided with a cut-away groove 5 with a depth d of 0.8mm to 1.2mm. The two ends of the connecting block 4 are respectively connected to the inner walls of the cut-away groove 5 on the two grid bottom frames 3 that are relatively staggered. At the position where the grid bottom frame 3 is opposite to the cut-away groove 5, a convex edge 6 that is adapted to the cut-away groove 5 is provided in the interior of the grid 1.

[0029] like Figure 4 As shown, in the new grid mesh belt along the grid coating feeding direction ( Figure 4 In the process of slicing (in the direction indicated by the arrow in the middle), the rolling cutter 801 in the rolling cutter mechanism 8 is used to cut the two columns of series-connected grids 1; the rolling cutter 802 is used to cut the connection point between the connecting block 4 and the bottom frame 3 of the grid, and the rolling cutter 802 first cuts the connection point between the higher end of the connecting block 4 and the inner wall of the cut avoidance groove 5 on the bottom frame 3 of the upper grid, and then cuts the connection point between the lower end of the connecting block 4 and the inner wall of the cut avoidance groove 5 on the bottom frame 3 of the lower grid. The setting of the connecting block 4 can effectively avoid the card problem caused by the connecting block being stuck between the two rolling cutters when the grid 1 is cut; the setting of cutting the avoidance groove 5 can effectively avoid scratching the battery separator when wrapping the battery separator.

[0030] Implementation 2:

[0031] This embodiment is a further improvement of embodiment 1. The main improvement is that, in this embodiment, the ends of the two adjacent connecting blocks are staggered up and down, such as Figure 5 and 6, the thickness of the connecting block 4 does not exceed 1 / 2 of the thickness of the bottom frame 3 of the grid. This means that if the upper end of the previous connecting block is connected to the upper inner wall of the cutting avoidance groove 5 on the upper grid bottom frame, and the lower end is connected to the lower inner wall of the cutting avoidance groove 5 of the lower grid bottom frame, then the upper end of the next connecting block is designed to be connected to the lower inner wall of the cutting avoidance groove 5 of the upper grid bottom frame, and the lower end is designed to be connected to the upper inner wall of the cutting avoidance groove 5 of the lower grid bottom frame; because the two ends of the connecting block are not of the same height, the thickness of the two ends of the connecting block needs to be thinner than the thickness of the grid bottom frame, and the strength may be lower. In this embodiment, the two ends of the adjacent connecting blocks are staggered in height, which can improve the strength of the entire connecting block. The thickness of the connecting block is designed to not exceed 1 / 2 of the thickness of the grid bottom frame. Only in this way can it be ensured that the roller cutter does not cut at the same time when cutting the two ends of the connecting block, effectively avoiding the problem of the roller cutter getting stuck.

[0032] Implementation 3:

[0033] This embodiment is a further improvement of embodiment 2. The main improvement is that in embodiment 2, the tabs 2 of the two series-connected grids 1 are suspended, and the grids 1 or tabs 2 are easily deformed during the process. Figure 7 and 8 The tabs 2 of the two rows of grids 1 connected in series are connected and fixed by connecting strips 7. The setting of the connecting strips 7 is equivalent to adding a reinforcing rib between the tabs 2, which effectively prevents the grids 1 or tabs 2 from deforming. The connecting strips 7 can be cut off using a rolling cutter 803 during subsequent cutting.

[0034] Apart from this, this embodiment is exactly the same as embodiment 2 and will not be described in detail here.

[0035] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A new type of grid belt, characterized in that: The invention is formed by horizontally connecting two rows of multiple grids (1) connected in series, wherein the pole ears (2) of the two rows of grids (1) connected in series are arranged on the outside of the new grid mesh belt in opposite directions; the grid bottom frames (3) of the two rows of grids (1) connected in series are arranged on the inside of the new grid mesh belt in opposite directions, and the two oppositely arranged grid bottom frames are connected by a connecting block (4); a cutting avoidance groove (5) is provided at the position of the grid bottom frame (3) connected to the connecting block (4), and the two ends of the connecting block (4) are respectively connected to the inner walls of the cutting avoidance groove (5) on the two grid bottom frames (3) arranged in opposite directions.

2. The new grid mesh belt according to claim 1 is characterized in that: At a position where the bottom frame (3) of the grid is opposite to the cutting avoidance groove (5), a convex edge (6) adapted to the cutting avoidance groove (5) is provided toward the inside of the grid (1).

3. The new type of grid belt according to claim 1 is characterized in that: The depth d of the cutting avoidance groove (5) is 0.8 mm to 1.2 mm.

4. The new type of grid mesh belt according to claim 1 is characterized in that: The upper and lower ends of the connecting block are different in height.

5. The new grid mesh belt according to claim 4 is characterized in that: The two ends of the adjacent connection blocks are arranged in an alternating manner up and down.

6. The new type of grid mesh belt according to claim 5, wherein the thickness of the connecting block (4) does not exceed 1 / 2 of the thickness of the bottom frame (3) of the grid.

7. The new type of grid belt according to claim 4 is characterized in that: The connecting block (4) is a "Z"-shaped structure.

8. The novel grid mesh belt according to any one of claims 1 to 7, characterized in that: The pole tabs (2) of the two rows of grids (1) connected in series are respectively connected and fixed via connecting bars (7).

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