Lead-acid battery grid and laser cutting method thereof

Abstract

The invention relates to a lead-acid battery grid and a laser cutting method thereof.The laser cutting method comprises the following steps that S1, digital modeling and path planning are conducted, specifically, a two-dimensional CAD drawing of a target grid is guided into a control system of a laser cutting machine, and the control system recognizes a side frame area, a vertical rib area and a transverse rib area of the target grid; planning independent laser cutting paths for the three sub-domains; s2, adaptive laser parameters are configured for different parts; s3, adaptive cutting execution: driving a laser cutting head, and cutting according to the planned path in the step S1 and by calling the laser parameters of the corresponding area; and S4, post-treatment and collection: after cutting is completed, the grid is taken down and cleaned. Different laser cutting strategies and parameters are adopted for different areas, so that the problems that a reinforcing frame is not cut thoroughly and slender and long ribs are overburnt and deformed are effectively solved, and the cutting quality and consistency of grids of various structures are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lead-acid battery manufacturing, and in particular to a lead-acid battery grid and a laser cutting method suitable for grids of different structures (including different side frame designs and areas far from the lug rib). BACKGROUND

[0002] As a core component of lead-acid batteries, the grid plays a role in supporting active materials and conducting current. Its structural design (such as the shape of the side frame, the layout of the rib, the position of the lug, etc.) directly affects the current distribution, internal resistance, life, and power performance of the battery. Traditional grid manufacturing mostly uses gravity casting or net drawing processes. Gravity casting has low production efficiency, high energy consumption, and high mold cost, especially it is difficult to quickly adapt to the demand for individualized grid structures with multiple varieties and small batches. Although the net drawing process is efficient, it produces a single grid structure and cannot manufacture grids with special reinforced side frames or complex rib patterns.

[0003] To solve these problems, researchers have been exploring new grid structure designs and manufacturing methods. However, traditional stamping forming methods have the problem of high development cost of stamping dies in actual production and new product research and development. Therefore, developing a new technology that can reduce research and development costs and improve grid performance has become the focus of current research.

[0004] In recent years, laser cutting technology has been tried for grid manufacturing. This technology uses a high-energy density laser beam to scan and ablate lead or lead alloy lead strips, directly cutting out the designed grid pattern. It has the advantages of no mold, high flexibility, flexible design changes, high precision, etc. The main comparison between the current laser cutting process and the ideal target is as follows:

[0005]

[0006]

[0007] From the data, the advantages of laser cutting in precision and design freedom are completely offset by the two problems of "slag hanging" and "thermal damage", resulting in a comprehensive economic and technical index that is not as good as the mature traditional process, which has plagued the entire lead-acid battery industry for more than 15 years. Over the past few years, top equipment manufacturers, material scientists, and battery manufacturers have invested huge amounts of research and development resources to try various solutions, but all have had little effect:

[0008] While fiber lasers or high-end CO2 lasers can be used to achieve smaller focused spots and higher energy densities, the initial investment and maintenance costs increase significantly. Therefore, this problem remains unresolved. Currently, only a few cases in the industry use laser cutting for the prototype production of small, thin lead-strip grids (such as backup batteries) where performance requirements are not high, and these cases require numerous post-processing steps to remove slag, making it unsuitable for large-scale, stable, and low-cost production of mainstream power and starter batteries.

[0009] CN110212202A discloses a tubular battery positive grid and its cutting method, which includes multiple ribs, an upper crossbeam, and lugs. The ribs have annular protrusions A (1mm higher than the ribs) and B (3mm higher than the ribs). Laser melting and solidification cutting is used to separate the lugs and the riser castings at the lugs. However, this patent only involves using laser melting and solidification cutting to separate the areas between the lugs and the riser castings, and between the upper crossbeam and the riser castings; it does not cover the grid frame, internal ribs, or differentiated laser cutting of different areas. The main challenge of this patent lies in the fine processing, especially for ribs with a size range of 0.5-1.0mm, ensuring that the appearance and internal microstructure of the grid ribs remain unchanged after cutting.

[0010] Therefore, developing a laser cutting method that can adapt to different grid sizes, especially one that can complete the cutting of side frames and long ribs with high quality, is crucial for promoting the application of laser cutting technology in lead-acid battery grid manufacturing. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lead-acid battery grid and its laser cutting method. This laser cutting method effectively solves the problems of incomplete cutting of the reinforcing frame and overheating and deformation of slender long ribs by adopting differentiated laser cutting strategies and parameters for different areas, and significantly improves the cutting quality and consistency of various structural grids.

[0012] To achieve the above objectives, the present invention adopts the following technical solution: a lead-acid battery grid, including tabs, horizontal ribs, vertical ribs, and a rectangular side frame composed of an upper frame, a right frame, a left frame, and a lower frame.

[0013] A laser cutting method for lead-acid battery grids as described above, characterized by comprising the following steps:

[0014] S1: Digital Modeling and Path Planning: Import the two-dimensional CAD drawing of the target grating into the control system of the laser cutting machine. The control system identifies the side frame area, vertical rib area and horizontal rib area of ​​the target grating, and plans independent laser cutting paths for the three sub-domains.

[0015] S2: Configure appropriate laser parameters for different parts;

[0016] S3: Adaptive cutting execution: Drive the laser cutting head to cut according to the planned path in step S1 and call the laser parameters of the corresponding area;

[0017] S4: Post-processing and collection: After cutting, remove the grid and clean it.

[0018] In step S2, corresponding laser parameters are configured for different regions, specifically as follows:

[0019] The first combination of cutting parameters configured for the side frame area is: laser power of 1500-2000W, cutting speed of 10-20m / min, and pulse frequency of 10-15KHz.

[0020] The second set of cutting parameters configured for the vertical rib area is as follows: laser power of 1000-1500W, cutting speed of 20-25m / min, and pulse frequency of 15-20KHz.

[0021] The third set of cutting parameters for the transverse rib area is: laser power of 500-1000W, cutting speed of 25-30m / min, and pulse frequency of 20-25KHz.

[0022] In step S2, the laser power of the first cutting parameter combination is higher than that of the second and third cutting parameter combinations, and the cutting speed of the first cutting parameter combination is lower than that of the second and third parameter combinations.

[0023] The laser power of the first cutting parameter combination is 20%-50% higher than that of the third cutting parameter combination, and the cutting speed of the first cutting parameter combination is 30%-60% lower than that of the third cutting parameter combination.

[0024] In step S3, the horizontal and vertical rib areas are cut first, and the side frame area and plate ears are cut last.

[0025] In step S3, an intermittent cutting strategy is adopted when cutting the long rib area.

[0026] In step S3, the intermittent cutting strategy involves cutting 5mm and then pausing for 0.1-0.5 seconds, i.e., cutting in segments and reserving cooling time between segments.

[0027] In step S3, when cutting to the connection point between the side frame and the rib in the side frame area, the laser beam is controlled to stay at the connection point for 0.1-0.5 seconds.

[0028] By employing different laser power, speed, and frequency parameters for cutting different regions of the grid size, the grain structure of the grid can be preserved to the greatest extent possible. This significantly improves the problems of "drossing" and "thermal damage" caused by laser cutting. On the other hand, it effectively solves the problem of high die development costs in the process of new product development caused by traditional stamping forming methods. At the same time, it can meet the requirements of different structural grid designs, reducing R&D costs.

[0029] Compared with the prior art, the advantages of this invention are as follows:

[0030] 1. High-quality cutting: By controlling the partition parameters, the complete cutting through of the reinforced side frame and good cross-sectional quality are ensured, while avoiding overheating, deformation and breakage of thin ribs (especially long ribs), and the overall cutting quality is significantly improved.

[0031] 2. Low deformation: The "inside-outside" cutting sequence (ribs first, then frame) combined with an intermittent cutting strategy effectively disperses and reduces heat accumulation and thermal stress during the cutting process, greatly reducing the overall warping deformation of the grid.

[0032] 3. High flexibility and efficiency: The core of the method lies in the software and parameter strategy, which can quickly adapt to the production of grids with different structural shapes without changing the hardware, realizing true flexible manufacturing and shortening the development cycle of new products.

[0033] 4. High process reliability: Special treatment of key connection points ensures thorough separation, reduces subsequent trimming processes, and improves production efficiency and product consistency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a plate grid structure with a reinforced frame in an embodiment of the present invention;

[0035] In the diagram: 1. Lug; 2. Frame; 3. Vertical rib; 4. Horizontal rib; 5. Connection point between rib and frame;

[0036] Figure 2 This is a comparative metallographic heat-affected zone diagram of the grid.

[0037] Figure 3 This is a diagram of the metallographic heat-affected zone of the grid in Embodiment 2 of the present invention. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0040] like Figure 1 The present invention relates to a lead-acid battery grid, comprising a plate lug 1, a horizontal rib 4, a vertical rib 3, and a rectangular side frame 2 composed of a top frame, a right frame, a left frame, and a bottom frame;

[0041] A laser cutting method for lead-acid battery grids includes the following steps:

[0042] S1: Digital Modeling and Path Planning: Import the CAD 2D graphic of the target grating into the control system of the laser cutting machine. The control system identifies the side frame area, vertical rib area and horizontal rib area of ​​the target grating, and plans an independent laser cutting path for each area.

[0043] S2: Laser parameter zoning settings: Configure different laser cutting parameters for the three feature regions in step S1;

[0044] The laser cutting parameters include at least laser power, cutting speed, and pulse frequency;

[0045] A first combination of cutting parameters is configured for the side frame area (2-6mm in size): laser power of 1500-2000W, cutting speed of 10-20m / min, and pulse frequency of 10-15KHz. The first combination of parameters is characterized by high laser power and low cutting speed to ensure complete cutting through the reinforced frame material.

[0046] A second combination of cutting parameters is configured for the vertical rib area (1.2-2mm in size): laser power of 1000-1500W, cutting speed of 20-25m / min, and pulse frequency of 15-20KHz;

[0047] A third combination of cutting parameters is configured for the transverse rib area (0.5-1.0mm in size): laser power of 500-1000W, cutting speed of 25-30m / min, and pulse frequency of 20-25KHz. The second and third parameter combinations are characterized by low laser power, high cutting speed, and high pulse frequency to achieve rapid, low-heat-input fine cutting and prevent the rib from overheating and deforming.

[0048] S3: Adaptive cutting execution: The control system drives the laser cutting head to cut lead or lead alloy strips by calling the corresponding partition cutting parameter combination according to the preset path.

[0049] Prioritize cutting the horizontal and vertical rib areas, and finally cut the side frame area and the connection between the lugs and the plate body.

[0050] S4: Post-processing and collection: After cutting, surface treatment and quality inspection are performed. The cut grids are cleaned. The cut surfaces are wiped clean with a lint-free cloth dampened with alcohol. The grid dimensions are measured with calipers to check the cutting accuracy. The surface quality is observed with a magnifying glass. Grids that do not meet the cutting accuracy and surface quality standards are recut.

[0051] In step S2, the specific difference between the first cutting parameter combination and the second and third cutting parameter combinations is that the laser power of the first cutting parameter combination is 20%-50% higher than that of the second and third cutting parameter combinations, and the cutting speed is 30%-60% lower.

[0052] Furthermore, in step S3, for the rib area far from the lug, an intermittent cutting strategy is adopted. That is, when cutting long ribs, they are not cut continuously in one go, but in segments, with a short cooling interval between each segment cut. Specifically, the intermittent cutting strategy involves pausing for 0.1-0.5 seconds after cutting 5mm.

[0053] Furthermore, in step S3, for the connection point 5 between the rib and the side frame, the laser beam briefly lingers at that position (0.1-0.5 seconds) or performs a circular scan to ensure that the connection point is completely cut off, avoiding the generation of burrs or adhesion.

[0054] Furthermore, the side frame is a reinforced thick frame or an irregularly shaped frame.

[0055] Example 1

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0057] like Figure 1 As shown, this embodiment takes a lead-acid battery grid with a reinforced thick side frame 2 and horizontal and vertical ribs 3 and 4 of different sizes as an example to illustrate the specific implementation of the present invention.

[0058] S1: Digital Modeling and Path Planning

[0059] Will Figure 1 The CAD drawing of the grating shown is imported into the control system of the laser cutting machine. The control system automatically or manually identifies the following key areas:

[0060] - Area A (Side border area) (size is 3mm): Includes the entire outer reinforced thick border 2.

[0061] - Area B (vertical rib area) (size is 1.6mm): mainly refers to vertical rib 3.

[0062] - Area C (Horizontal Rib Area) (size is 0.8mm): mainly refers to horizontal rib 4.

[0063] The system plans the cutting path: prioritize cutting areas B and C (vertical and horizontal ribs 3 and 4), and cut areas A (side frame 2) and the final connection between the lug 1 and the plate body.

[0064] S2: Laser parameter zone settings

[0065] For the side frame area of ​​region A (3mm in size), a first cutting parameter combination is configured: laser power of 1800W, cutting speed of 15m / min, and pulse frequency of 12KHz. The first cutting parameter combination is characterized by high laser power and low cutting speed to ensure complete cutting through the reinforced frame material.

[0066] For the vertical rib area (1.6mm in size) in region B, a second combination of cutting parameters was configured: laser power of 1200W, cutting speed of 22m / min, and pulse frequency of 17KHz for cutting.

[0067] For the transverse rib area C (0.8mm in size), a third combination of cutting parameters is configured: laser power of 700W, cutting speed of 28m / min, and pulse frequency of 22KHz. The second and third combinations of cutting parameters are characterized by low laser power, high cutting speed, and high pulse frequency to achieve rapid, low heat input, and fine cutting, preventing the rib from overheating and deforming.

[0068] S3: Adaptive Cutting Execution

[0069] The laser cutting head begins operation under the control of the CNC system:

[0070] First, according to the second and third cutting parameter combinations, all horizontal and vertical ribs are quickly cut using an intermittent skipping method. After each small segment (e.g., 2-3mm) is cut, the laser head moves to the next segment, with a millisecond interval in between to facilitate heat dissipation.

[0071] Then, following the first set of cutting parameters, the entire reinforced side frame 2 is steadily cut. When the cutting head reaches the connection point 5, it pauses briefly for 0.2 seconds to ensure a complete cut. The lug 1 is finally separated from the plate body.

[0072] S4: Post-processing and collection

[0073] Post-processing and collection: After cutting, surface treatment and quality inspection are performed. The cut grids are cleaned. The cut surfaces are wiped clean with a lint-free cloth dampened with alcohol. Grid dimensions are measured using calipers to check cutting accuracy, and surface quality is observed using a magnifying glass. Grids that do not meet the cutting accuracy and surface quality standards are recut.

[0074] Example 2

[0075] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0076] like Figure 1 As shown, this embodiment takes a lead-acid battery grid with a reinforced thick side frame 2 and horizontal and vertical ribs 3 and 4 of different sizes as an example to illustrate the specific implementation of the present invention.

[0077] S1: Digital Modeling and Path Planning

[0078] Will Figure 1 The CAD drawing of the grating shown is imported into the control system of the laser cutting machine. The system automatically or with manual assistance identifies the following key areas:

[0079] - Area A (Side border area) (size 4mm): Includes the entire outer reinforced thick border 2.

[0080] - Area B (vertical rib area) (size is 1.8mm): mainly refers to vertical rib 3.

[0081] - Area C (horizontal rib area) (size is 0.6mm): mainly refers to horizontal rib 4.

[0082] The system plans the cutting path: prioritize cutting areas B and C (vertical and horizontal ribs 3 and 4), and cut areas A (side frame 2) and the final connection between the lug 1 and the plate body.

[0083] S2: Laser parameter zone settings

[0084] For the side frame area of ​​region A (size is 4mm), the first cutting parameter combination is configured: laser power is 1600W, cutting speed is 17m / min, pulse frequency is 13KHz. The first cutting parameter combination is characterized by high laser power and low cutting speed to ensure that the reinforced frame material is completely cut through.

[0085] For the vertical rib area (1.8mm in size) in region B, a second combination of cutting parameters was configured: laser power of 1400W, cutting speed of 20m / min, and pulse frequency of 18KHz for cutting.

[0086] For the transverse rib area C (0.6mm in size), a third combination of cutting parameters is configured: laser power of 800W, cutting speed of 25m / min, and pulse frequency of 20KHz. The second and third combinations of cutting parameters are characterized by low laser power, high cutting speed, and high pulse frequency to achieve rapid, low heat input, and fine cutting, preventing the rib from overheating and deforming.

[0087] S3: Adaptive Cutting Execution

[0088] The laser cutting head begins operation under the control of the CNC system:

[0089] First, according to the second and third cutting parameter combinations, all horizontal and vertical ribs are quickly cut using an intermittent skipping method. After each small segment (e.g., 2-3mm) is cut, the laser head moves to the next segment, with a millisecond interval in between to facilitate heat dissipation.

[0090] Then, following the first set of cutting parameters, the entire reinforced side frame 2 is steadily cut. When the cutting head reaches the connection point 5, it pauses briefly for 0.2 seconds to ensure a complete cut. The lug 1 is finally separated from the plate body.

[0091] S4: Post-processing and collection

[0092] Post-processing and collection: After cutting, surface treatment and quality inspection are performed. The cut grid surfaces are cleaned. The cut surfaces are wiped clean with a lint-free cloth dampened with alcohol. The cutting accuracy and surface quality of the grid are inspected. Grid dimensions are measured using calipers to check cutting accuracy, and surface quality is observed using a magnifying glass. Grids that do not meet the cutting accuracy and surface quality standards are recut.

[0093] Example 3

[0094] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0095] like Figure 1 As shown, this embodiment takes a lead-acid battery grid with a reinforced thick side frame 2 and horizontal and vertical ribs 3 and 4 of different sizes as an example to illustrate the specific implementation of the present invention.

[0096] S1: Digital Modeling and Path Planning

[0097] Will Figure 1 The CAD drawing of the grating shown is imported into the control system of the laser cutting machine. The system automatically or with manual assistance identifies the following key areas:

[0098] - Area A (Side border area) (size 5mm): Includes the entire outer reinforced thick border 2.

[0099] - Area B (vertical rib area) (size is 1.4mm): mainly refers to vertical rib 3.

[0100] - Area C (horizontal rib area) (size is 0.7mm): mainly refers to horizontal rib 4.

[0101] The system plans the cutting path: prioritize cutting areas B and C (vertical and horizontal ribs 3 and 4), and cut areas A (side frame 2) and the final connection between the lug 1 and the plate body.

[0102] S2: Laser parameter zone settings

[0103] For the side frame area of ​​region A (dimension size 5mm), the first cutting parameter combination is configured: laser power of 1700W, cutting speed of 13m / min, and pulse frequency of 14KHz. The first cutting parameter combination is characterized by high laser power and low cutting speed to ensure complete cutting through the reinforced frame material.

[0104] For the vertical rib area (1.4mm in size) in region B, a second combination of cutting parameters was configured: laser power of 1100W, cutting speed of 24m / min, and pulse frequency of 16KHz for cutting.

[0105] For the transverse rib area C (0.7mm in size), a third combination of cutting parameters is configured: laser power of 700W, cutting speed of 28m / min, and pulse frequency of 20KHz. The second and third combinations of cutting parameters are characterized by low laser power, high cutting speed, and high pulse frequency to achieve rapid, low heat input, and fine cutting, preventing the rib from overheating and deforming.

[0106] S3: Adaptive Cutting Execution

[0107] The laser cutting head begins operation under the control of the CNC system:

[0108] First, according to the second and third cutting parameter combinations, all horizontal and vertical ribs are quickly cut using an intermittent skipping method. After each small segment (e.g., 2-3mm) is cut, the laser head moves to the next segment, with a millisecond interval in between to facilitate heat dissipation.

[0109] Then, following the first set of cutting parameters, the entire reinforced side frame 2 is steadily cut. When the cutting head reaches the connection point 5, it pauses briefly for 0.2 seconds to ensure a complete cut. The lug 1 is finally separated from the plate body.

[0110] S4: Post-processing and collection

[0111] Post-processing and collection: After cutting, surface treatment and quality inspection are performed. The cut grid surfaces are cleaned. The cut surfaces are wiped clean with a lint-free cloth dampened with alcohol. The cutting accuracy and surface quality of the grid are inspected. Grid dimensions are measured using calipers to check cutting accuracy, and surface quality is observed using a magnifying glass. Grids that do not meet the cutting accuracy and surface quality standards are recut.

[0112] Comparative Example

[0113] All areas of the grid are cut using the same configuration parameters: laser power of 2500W, cutting speed of 30m / min, and pulse frequency of 15KHz.

[0114] Performance tests were conducted on the grids of Examples 1, 2, and 3, as well as the comparative example. The test results are as follows:

[0115]

[0116] Among them, the grid growth and corrosion resistance test adopted the constant flow gravimetric method. The experimental conditions were: 75℃ water bath, 4A (6+7-) constant current charging for 400h, the weight corrosion rate was calculated, and the grid size was measured to calculate the growth rate. The heat-affected zone was observed with a metallographic microscope.

[0117] In Example 2, the grid corrosion rate was 35.1%, lower than the comparative example's 43.2%; the grid growth rate was 4.05%, lower than the comparative example's 7.10%. Figure 3 In Example 2, the heat-affected zone of the grid is 134 μm lower than... Figure 2 In summary, using different laser power, speed, and frequency parameters for cutting different grid sizes in different regions can maximize the preservation of the grid grain structure. This significantly improves upon the existing problems of "drossing" and "thermal damage" in laser cutting. Furthermore, it effectively solves the problem of high die development costs associated with traditional stamping methods in new product development. Simultaneously, it can meet the needs of different grid designs, reducing R&D costs.

[0118] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lead-acid battery grid, characterized in that: It includes the pole lug (1), the horizontal rib (4), the vertical rib (3), and the rectangular side frame (2) formed by the top frame, the right frame, the left frame and the bottom frame.

2. A laser cutting method for the lead-acid battery grid as described in claim 1, characterized in that, Includes the following steps: S1: Digital Modeling and Path Planning: Import the two-dimensional CAD drawing of the target grating into the control system of the laser cutting machine. The control system identifies the side frame area, vertical rib area and horizontal rib area of ​​the target grating, and plans independent laser cutting paths for the three sub-domains. S2: Configure appropriate laser parameters for different parts; S3: Adaptive cutting execution: Drive the laser cutting head to cut according to the planned path in step S1 and call the laser parameters of the corresponding area; S4: Post-processing and collection: After cutting, remove the grid and clean it.

3. The laser cutting method for lead-acid battery grids according to claim 2, characterized in that, In step S2, corresponding laser parameters are configured for different regions, specifically as follows: The first combination of cutting parameters configured for the side frame area is: laser power of 1500-2000W, cutting speed of 10-20m / min, and pulse frequency of 10-15KHz. The second set of cutting parameters configured for the vertical rib area is as follows: laser power of 1000-1500W, cutting speed of 20-25m / min, and pulse frequency of 15-20KHz. The third set of cutting parameters for the transverse rib area is: laser power of 500-1000W, cutting speed of 25-30m / min, and pulse frequency of 20-25KHz.

4. The laser cutting method for lead-acid battery grids according to claim 3, characterized in that: In step S2, the laser power of the first cutting parameter combination is higher than that of the second and third cutting parameter combinations, and the cutting speed of the first cutting parameter combination is lower than that of the second and third parameter combinations.

5. The laser cutting method for lead-acid battery grids according to claim 3, characterized in that: The laser power of the first cutting parameter combination is 20%-50% higher than that of the third cutting parameter combination, and the cutting speed of the first cutting parameter combination is 30%-60% lower than that of the third cutting parameter combination.

6. The laser cutting method for lead-acid battery grids according to claim 3, 4, or 5, characterized in that, In step S3, the horizontal and vertical rib areas are cut first, and the side frame area and plate ears are cut last.

7. The laser cutting method for lead-acid battery grids according to claim 6, characterized in that: In step S3, an intermittent cutting strategy is adopted when cutting the long rib area.

8. The laser cutting method for lead-acid battery grids according to claim 7, characterized in that: In step S3, the intermittent cutting strategy involves cutting 5mm and then pausing for 0.1-0.5 seconds, i.e., cutting in segments and reserving cooling time between segments.

9. A laser cutting method for lead-acid battery grids with different structures according to claim 1, 7, or 8, characterized in that: In step S3, when cutting to the connection point between the side frame and the rib in the side frame area, the laser beam is controlled to stay at the connection point for 0.1-0.5 seconds.

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