A method for detecting surface cracks of cast plates of lead-acid storage batteries

Abstract

A kind of lead-acid battery cast plate surface crack detection method, comprising the following steps: by manual way to the both sides of plate cover coating paper, obtain no crack plate and standard plate with crack as standard plate;Take no crack plate and standard plate respectively completely soak sufficient water absorption;Rest, remove the excess moisture on the surface of plate;No crack plate and standard plate are placed in crack detection device in turn, calculate the volume flow rate Q 无 And Q 标 ; using drawing software to estimate the total area A 裂 Of crack on standard plate;Calculate the flow rate V 裂 When water passes through the crack on standard plate, it is called standard value;To be tested plate is detected using crack detection device, obtain the volume flow rate, calculate crack area A 待裂 , determine A 待裂 Less than A 裂 , to be tested plate is qualified plate.The method can quickly and effectively realize the detection and quantification of plate surface crack, improve the overall quality of plate, and further improve the battery performance and service life.

Description

Technical Field

[0001] This invention relates to a method for detecting surface cracks in cast plates of lead-acid batteries, belonging to the field of battery technology. Background Technology

[0002] In the coating process of starting lead-acid batteries, plate adhesion is a common problem. To ensure the quality of the plates after curing, continuous grid coating typically uses a coating paper covering the surface during coating. In contrast, single-piece cast grids use a method that increases the temperature of the rapid drying line to reduce surface moisture content, thus solving the adhesion problem during plate collection and curing. Unlike continuous coating, single-piece cast plates, lacking coating paper protection and plate compaction, exhibit more surface cracks after passing through the rapid drying line. These cracks reduce the bonding strength between lead paste particles and affect the battery's charge and discharge performance, necessitating control over the number of cracks. Because the surface cracks are irregularly distributed, neither the number nor the length of cracks can be quickly and effectively assessed. Therefore, a detection method is urgently needed to statistically analyze cracks and fill the gaps in existing detection technologies. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a method for detecting surface cracks in cast plates of lead-acid batteries. This method can quickly and effectively detect and quantify surface cracks, increase the control standards and requirements for the number of surface cracks, improve the overall quality of the plates, and thus enhance battery performance and service life.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A method for detecting surface cracks in cast plates of lead-acid batteries, the method comprising the following steps:

[0006] a. The electrode plates are manually coated with paper on both sides, then cured and dried using a rapid drying line to obtain a crack-free cast electrode plate. Simultaneously, a cracked cast electrode plate produced under fully controlled production conditions is used as a standard electrode plate. The crack-free electrode plate and the standard electrode plate have the same area, and the measurement is recorded as A. 极板 ;

[0007] b. Take 10 plates without cracks on the surface and 10 standard plates, and immerse them completely in water for 5 minutes to allow them to fully absorb water.

[0008] c. After soaking, place the electrode plates on the electrode plate rack and let them stand for 1 minute to remove excess water from the surface of the electrode plates;

[0009] d. Place the crack-free electrode plate and the standard electrode plate into the crack detection device in sequence. The detection time is T. Record the water volume passing through the crack-free electrode plate and the standard electrode plate respectively, and calculate the water volumetric flow rate Q.无 and Q 标 ;

[0010] e. Use drafting software to statistically analyze the length, width, and number of cracks on the surface of the standard electrode plate, and estimate the total crack area A. 裂 ;

[0011] f. Water flow through cracks on a standard electrode plate

[0012] speed This V 裂 Let Q be the standard value, where Q is the standard value. 裂 Q is the water flow rate through the crack on the standard electrode plate. ’ 无 The flow rate of water passing through the crack-free section of the standard electrode plate;

[0013] g. Take the electrode plate to be tested and use a crack detection device for detection. The detection time is T. Calculate the water volume flow rate Q by measuring the water volume. 待 Crack area but Among them, Q 待裂 To measure the water flow rate at the crack in the electrode being tested, Q 待无 The water flow rate through the crack-free section of the electrode to be tested;

[0014] h, Determine A 待裂 and A 裂 Size, A 待裂 Less than A 裂 The electrode plate to be tested is a qualified electrode plate.

[0015] The above-mentioned method for detecting surface cracks in cast plates of lead-acid batteries, wherein the crack detection device in step d includes a water injection tank, a plate slot, an overflow tank, an overflow plate, a guide channel, and a weighing container. The water injection tank and the overflow tank are integrated as a high and low platform. The overflow plate is vertically arranged between the water injection tank and the overflow tank. The plate slot is arranged on the bottom plate of the water injection tank. The top end of the guide channel is connected to the plate slot, and the bottom end is connected to the weighing container. The water injection tank has an inlet at the front end and an outlet at the end end. The bottom of the water injection tank has a support leg.

[0016] The above-mentioned method for detecting surface cracks in cast plates of lead-acid batteries, in step d, includes the following steps:

[0017] S1. Place the electrode plate into the electrode plate slot, and seal the electrode plate with the edge of the electrode plate slot. At the same time, cover the top of the electrode plate with a waterproof cover to prevent water from flowing out before timing.

[0018] S2. Open the water inlet to fill the water tank. After the tank is full, the water flows from the overflow plate into the overflow tank, and the water in the overflow tank flows out from the water outlet.

[0019] S3. Open the waterproof cover and start timing. After time T, close the waterproof cover again. The water that seeps out through the electrode plate enters the weighing container through the guide channel.

[0020] S4. Record the weight change M of the weighing container before and after. 水 Calculate the volume of water that seeps through the electrode plate and calculate the water flow rate.

[0021] The method for detecting surface cracks in the cast plates of lead-acid batteries described above, wherein the overflow plate has a height of 2cm.

[0022] In the above-mentioned method for detecting surface cracks in cast plates of lead-acid batteries, the detection time T in steps d and g is the same, which is 30s to 60s.

[0023] The beneficial effects of this invention are:

[0024] This invention enables rapid detection of surface cracks on electrode plates, filling a gap in electrode plate surface crack detection technology. Furthermore, by increasing control standards and related requirements for electrode plate surface cracks, the overall quality of the electrode plates can be improved, thereby enhancing battery performance and lifespan. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the crack detection device of the present invention.

[0026] In the diagram: 1. Water filling tank; 2. Electrode plate slot; 3. Overflow tank; 4. Overflow plate; 5. Flow guide channel; 6. Weighing container; 7. Water inlet; 8. Water outlet; 9. Support leg; 10. Waterproof cover. Detailed Implementation

[0027] The present invention will be further described below with reference to the embodiments.

[0028] The device for crack detection of the present invention includes a water injection tank 1, an electrode plate slot 2, an overflow tank 3, an overflow plate 4, a flow guiding channel 5, and a weighing container 6. The water injection tank 1 and the overflow tank 3 are integrated into a platform with different heights. The bottom plate of the overflow tank is lower than the bottom plate of the water injection tank. The overflow plate 4 is vertically arranged between the water injection tank and the overflow tank, with a height of 2 cm. The electrode plate slot 2 is set on the bottom plate of the water injection tank 1. During testing, the battery electrode plate is locked in the electrode plate slot, and the connection between the electrode plate and the electrode plate slot is sealed to prevent the test liquid from seeping out between the electrode plate and the electrode plate slot. The top end of the flow guiding channel 5 is connected to the electrode plate slot 2, and the bottom end is connected to the weighing container 6. The front end of the water injection tank 1 is provided with a water inlet 7, and the end end is provided with a water outlet 8. The bottom of the water injection tank 1 is provided with a support leg 9, and the top end of the electrode plate slot is sealed with a waterproof cover plate 10.

[0029] The standard electrode plate used in the detection method of this invention is an electrode plate with surface cracks, the condition of which does not affect subsequent use. The selection of the standard electrode plate is not unique; depending on changes in the manufacturing process, a new standard electrode plate needs to be selected. Under the same manufacturing process, a standard electrode plate of a fixed model only needs to be selected once. It should be noted that regardless of the model of the standard electrode plate selected, crack detection on the same model of electrode plate to be tested can be performed using the method of this invention.

[0030] A method for detecting surface cracks in cast plates of lead-acid batteries, the method comprising the following steps:

[0031] a. The electrode plates are manually coated with paper on both sides, then cured and dried using a rapid drying line to obtain a crack-free cast electrode plate. Simultaneously, a cracked cast electrode plate produced under fully controlled production conditions is used as a standard electrode plate. The crack-free electrode plate and the standard electrode plate have the same area, and the measurement is recorded as A. 极板 =14.5 × 13 = 188.5 cm 2 ;

[0032] b. Take 10 plates without cracks on the surface and 10 standard plates, and immerse them completely in water for 5 minutes to allow them to fully absorb water.

[0033] c. After soaking, place the electrode plates on the electrode plate rack and let them stand for 1 minute to remove excess water from the surface of the electrode plates;

[0034] d. Place the above-mentioned crack-free electrode plate and standard electrode plate into the crack detection device in sequence to detect the water flow rate. The specific detection steps are as follows:

[0035] S1. Place the electrode plate into the electrode plate slot 2, and at the same time cover the upper part of the electrode plate with a waterproof cover plate 10 to prevent water from seeping down from the electrode plate before the test timing.

[0036] S2. Open the water inlet 7 to fill the water tank 1. After the tank is full, the water flows from the overflow plate 4 into the overflow tank 3. The water in the overflow tank 3 flows out from the water outlet 8.

[0037] S3. Open the waterproof cover 10 and start timing. After testing for 1 minute, put the waterproof cover 10 back on. The water that seeps out through the electrode plate enters the weighing container 6 through the guide channel 5.

[0038] S4. Record the weight change M of the weighing container 6 before and after. 水 Calculate the volume of water flowing out through the electrode plate and the water flow rate. Table 1 shows the weight change of the weighing container, that is, the weight of water passing through the electrode plate during the test.

[0039] Table 1. Weight Changes of Weighing Containers

[0040]

[0041] Through water volume V 无 =20g / 1g / cm 3 =20cm 3 Then the flow Q 无 =V 无 / T=20cm 3 / 1min=20cm 3 / min, similarly Q 标 =401cm 3 / min.

[0042] e. Using drafting software, statistical analysis was performed on the length, width, and number of cracks on the surface of the standard electrode plate. The average width was 0.16 mm, the average length of a single crack was 8 mm, and there were 200 cracks. The total area of ​​the cracks, A, was then calculated. 裂 =200×8×0.16=256mm 2 =2.56cm 2 .

[0043] f. The total area A of the plates already measured in step a. 极板 =14.5 × 13 = 188.50 cm 2 The water flow rate through the crack-free position of the standard electrode plate is... / 188.5=19.7cm 3 / min, then Q 裂 =Q 标 -Q ’ 无 =401-19.7=381.3cm 3 / min, the flow velocity V of water passing through the crack on the standard electrode plate 裂 =Q 裂 / A 裂=381.3 / 2.56 = 148.9 cm / min, this V 裂 Let Q be the standard value, where Q is the standard value. 裂 Q is the water flow rate through the crack on the standard electrode plate. ’ 无 The flow rate of water passing through the crack-free section of the standard electrode plate;

[0044] g. Take the same type of electrode plate to be tested, and use a crack detection device to test it in the above manner. The detection time is 1 minute, and the water flow rate Q is obtained. 待 =380mL / min, A 待裂 =(Q 待 -Q 无 ) / (V 裂 -Q 无 / A 极板 )=(380-20) / (148.9-20 / 188.5)=2.419cm 2 .

[0045] h, Determine A 待裂 <A 裂 2.419cm 2 <2.56cm 2 Therefore, if the sample meets the expectations, it is a qualified electrode plate; otherwise, it is an unqualified electrode plate.

Claims

1. A method for detecting surface cracks in cast plates of lead-acid batteries, characterized in that: The detection method includes the following steps: a. The electrode plates are manually coated with paper on both sides, then cured and dried using a rapid drying line to obtain a crack-free cast electrode plate. Simultaneously, a cracked cast electrode plate produced under fully controlled production conditions is used as a standard electrode plate. The crack-free electrode plate and the standard electrode plate have the same area, and the measurement is recorded as A. 极板 ; b. Take 10 plates without cracks on the surface and 10 standard plates, and immerse them completely in water for 5 minutes to allow them to fully absorb water. c. After soaking, place the electrode plates on the electrode plate rack and let them stand for 1 minute to remove excess water from the surface of the electrode plates; d. Place the crack-free electrode plate and the standard electrode plate into the crack detection device in sequence. The detection time is T. Record the water volume passing through the crack-free electrode plate and the standard electrode plate respectively, and calculate the water volumetric flow rate Q. 无 and Q 标 ; e. Use drafting software to statistically analyze the length, width, and number of cracks on the surface of the standard electrode plate, and estimate the total crack area A. 裂 ; f. The flow velocity of water passing through the crack on the standard electrode plate This V 裂 Let Q be the standard value, where Q is the standard value. 裂 Q is the water flow rate through the crack on the standard electrode plate. ’ 无 The flow rate of water passing through the crack-free section of the standard electrode plate; g. Take the electrode plate to be tested and use a crack detection device for detection. The detection time is T. Calculate the water volume flow rate Q by measuring the water volume. 待 Crack area but Among them, Q 待裂 To measure the water flow rate at the crack in the electrode being tested, Q 待无 The water flow rate through the crack-free section of the electrode to be tested; h, Determine A 待裂 and A 裂 Size, A 待裂 Less than A 裂 The electrode plate to be tested is a qualified electrode plate.

2. The method for detecting surface cracks in cast plates of lead-acid batteries according to claim 1, characterized in that: The crack detection device in step d includes a water injection tank (1), an electrode slot (2), an overflow tank (3), an overflow plate (4), a flow guide channel (5), and a weighing container (6). The water injection tank (1) and the overflow tank (3) are integrated into a high-low platform. The overflow plate (4) is vertically arranged between the water injection tank and the overflow tank. The electrode slot (2) is arranged on the bottom plate of the water injection tank (1). The top end of the flow guide channel (5) is connected to the electrode slot (2), and the bottom end is connected to the weighing container (6). The water injection tank (1) has an inlet (7) at the front end and an outlet (8) at the end. The bottom of the water injection tank (1) has a support leg (9).

3. The method for detecting surface cracks in cast plates of lead-acid batteries according to claim 2, characterized in that: In step d, the crack detection process includes the following steps: S1. Place the electrode plate into the electrode plate slot (2), and seal the electrode plate with the edge of the electrode plate slot. At the same time, cover the top of the electrode plate with a waterproof cover plate (10) to prevent water from flowing out before timing. S2. Open the inlet (7) to fill the water tank (1). After the tank is full, the water flows from the overflow plate (4) into the overflow tank (3), and the water in the overflow tank (3) flows out from the outlet (8). S3. Open the waterproof cover and start timing. After time T, close the waterproof cover again. The water seeping out through the electrode plate enters the weighing container (6) through the guide channel (5). S4. Record the weight change M of the weighing container (6) before and after. 水 Calculate the volume of water that seeps through the electrode plate and calculate the water flow rate.

4. The method for detecting surface cracks in cast plates of lead-acid batteries according to claim 2, characterized in that: The height of the overflow plate (4) is 2cm.

5. The method for detecting surface cracks in cast plates of lead-acid batteries according to claim 1, characterized in that: The detection time T in steps d and g is the same, which is 30s to 60s.

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