A quality detection method for valve-regulated lead-acid battery cover

Abstract

The application discloses a quality detection method of a valve-controlled lead storage battery cover and relates to the valve-controlled lead storage battery cover. The standard safety valve simulation detection device can accurately simulate the actual working pressure range of the exhaust valve, and the detection method can test the safety valves with small differences (the pressure range is 34-36 kPa, and the difference is 2 kPa), so that the safety valves with small differences can be randomly used for the detection of the exhaust valve pressure of the middle cover, and the consistency of the pressure is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a valve-regulated lead-acid battery cover, in particular to a quality detection method of a valve-regulated lead-acid battery cover. BACKGROUND

[0002] Lead-acid batteries are reversible direct current power sources that can convert chemical energy into electrical energy and vice versa. Lead-acid batteries mainly consist of electrolyte, tank cover and pole group. The electrolyte of lead-acid batteries is sulfuric acid solution. The pole group mainly consists of positive plates, negative plates and separators. The separator mainly stores electrolyte, serves as a gas passage for oxygen recombination, and prevents active material from falling off and short-circuiting between the positive and negative electrodes.

[0003] The middle cover exhaust valve is an important component of lead-acid batteries, and its design, manufacture and detection must follow strict standards and specifications. In practical applications, the middle cover exhaust valve needs to accurately and quickly respond to the pressure changes inside the system, ensuring that it can timely exhaust in case of overpressure or negative pressure, thereby protecting the system from damage or causing safety accidents.

[0004] Pressure detection is one of the important means to evaluate the performance of the middle cover exhaust valve. By detecting the opening and closing of the exhaust valve under different pressures, it can be determined whether it meets the design requirements and usage needs. However, in actual operation, due to the differences in detection tools and the changes in the performance of the exhaust valve, certain errors may be brought to the detection results.

[0005] Currently, some enterprises use random safety valves as detection tools to detect the pressure of the middle cover exhaust valve. However, this approach has many limitations. First, the performance parameters (such as opening pressure, sealing performance, etc.) of random safety valves may vary due to differences in production, design, materials, etc. This difference, when used as a detection tool, will directly affect the accuracy of the pressure detection of the middle cover exhaust valve. Second, the opening pressure of the random safety valve may not completely match the actual working pressure range of the middle cover exhaust valve, which will also cause errors in the detection results.

[0006] If a safety valve is used to test multiple exhaust valves, the internal structure and performance of the exhaust valve may be affected due to the pressure change it undergoes during each test. Especially when the exhaust valve is tested multiple times, its internal parts may gradually fail due to fatigue, wear and tear, etc., causing the pressure to gradually decrease or the sealing performance to decrease. In this case, even if the same safety valve is used for detection, the accuracy of the detection results will be affected due to the changes in the performance of the exhaust valve.

[0007] In order to solve the above problems, it is necessary to seek a more accurate and reliable detection device and method, and to replace the random safety valve with a special pressure detection device. Such device should have the characteristics of high precision, high stability and high repeatability, and can accurately simulate the actual working pressure range of the exhaust valve, and carry out comprehensive and systematic detection, and obtain qualified valve-controlled lead-acid battery cover through setting related conditions. SUMMARY

[0008] The present application tests a batch of safety valves with small difference (pressure range 34-36 kPa, difference 2 kPa) by a test device and method, and detects the pressure of the middle cover exhaust valve at random. It is beneficial to the consistency of the new mold middle cover pressure.

[0009] The specific technical solutions of the present application are as follows:

[0010] The present application provides a quality detection method for valve-controlled lead-acid battery cover, the top surface of the valve-controlled lead-acid battery cover has an acid hole column, and the acid hole column is used for sleeving and installing a safety valve, the safety valve is in the shape of a cap, and the quality detection method for the valve-controlled lead-acid battery cover comprises the following steps:

[0011] (1) Select one of the acid hole columns of a piece of quality qualified valve-controlled lead-acid battery cover as a reference, and randomly detect several safety valves, test the opening pressure of the safety valve in 34-36 kPa for subsequent step detection;

[0012] (2) Make a standard safety valve simulation detection device for valve-controlled lead-acid battery cover, the standard safety valve simulation detection device comprises:

[0013] A simulation detection seat has an annular groove on the top surface, and a vertical air hole in the middle of the annular groove, the annular groove and the air hole form a detection hole column for installing the safety valve to be detected; the height of the outer side wall of the annular groove is higher than the height of the top surface of the safety valve to be detected after being installed on the detection hole column; the bottom end of the air hole is used for external connection of the gas source;

[0014] A transparent gland is used to cover the simulation detection seat, the transparent gland covers the range of the annular groove, the detection hole column and the air hole; the top surface of the simulation detection seat and the transparent gland are connected, the outer side wall of the annular groove of the simulation detection seat or the transparent gland is provided with an exhaust passage communicating with the annular groove;

[0015] A pressure rod piece comprises a bracket fixedly connected with the simulation detection seat, and a pressure rod arranged on the bracket and used for pressing the transparent gland;

[0016] (3) Use the safety valves selected in step (1) to test the standard safety valve simulation testing device prepared in step (2). The standard safety valve simulation testing device with valve opening pressure of 34 to 36 kPa is used for subsequent testing steps.

[0017] (4) Use the standard safety valve simulation testing device that passed the test in step (3) to test and screen standard safety valves, and screen safety valves with opening pressure of 34 to 36 kPa as standard safety valves.

[0018] (5) Use the standard safety valve obtained in step (4) for quality inspection of the valve-controlled lead-acid battery cover. If the opening pressure of each acid filling hole column in the valve-controlled lead-acid battery cover to be inspected is 30-40 kPa when tested by the standard safety valve, then the valve-controlled lead-acid battery cover to be inspected is deemed qualified.

[0019] In steps (1) and (4), the standard valve with a pressure of 34-36 kPa acts as a weight, serving as a test sample that must be precise. 30-40 kPa is the acceptable range for the middle cover; anything within this range is considered acceptable. 34-36 kPa falls within the 30-40 kPa range, ensuring the accuracy and uniformity of the test. If the outer diameter of the exhaust valve is too small, the measured value will be close to 30 kPa; if the outer diameter is too large, the measured value will be close to 40 kPa.

[0020] Preferably, the draft angle of the outer wall of the acid filling hole column of the valve-controlled lead-acid battery cover selected in step (1) is 0.3 to 0.6 degrees; the draft angle of the outer wall of the detection hole column of the standard safety valve simulation detection device in step (2) is 0.3 to 0.6 degrees.

[0021] More preferably, the draft angle of the outer wall of the acid filling hole column of the valve-controlled lead-acid battery cover selected in step (1) is 0.45 degrees; and the draft angle of the outer wall of the detection hole column of the standard safety valve simulation detection device in step (2) is 0.45 degrees.

[0022] An appropriate draft angle ensures a more precise fit between the acid filling orifice and the testing orifice during assembly or testing. This precise fit provides better sealing performance, preventing leakage problems caused by poor sealing during testing or use.

[0023] The draft angle setting can also affect the pressure distribution on the surface of the orifice. With an appropriate draft angle, the force on the orifice surface is more uniform, which helps to provide a more stable pressure environment during testing, thereby more accurately simulating the pressure conditions in actual use.

[0024] Through experiments and verification, 0.45 degrees is selected as the preferred value of the demolding slope, which is based on the comprehensive consideration of factors such as valve opening pressure, sealing performance, and operation convenience. This optimized design not only improves the performance and quality of the product, but also helps to reduce production costs and improve production efficiency.

[0025] Preferably, in step (5), each acid addition hole column is detected 2-3 times, and the valve opening pressure of each time is 30-40 kPa.

[0026] The side wall of the air hole extends downward to form a connecting column protruding downward from the simulation detection seat, and the bottom of the connecting column has a connecting pipe with a reduced diameter, which is used to connect an air source. By reducing the diameter, the tightness and stability of the connection can be ensured, and the possibility of gas leakage can be reduced.

[0027] Further, the bracket includes a bottom plate sleeved on the connecting column, and a mounting plate located above the simulation detection seat, and the bottom plate and the mounting plate are connected by a connecting plate.

[0028] The mounting plate is provided with a threaded hole, and the pressing rod is a screw rod matched with the threaded hole.

[0029] Further, the top of the screw rod has an operating rod, and the bottom has an abutting portion abutting against the transparent pressure cover.

[0030] Through the combination of the bottom plate, the connecting plate and the mounting plate, the bracket forms a stable structure, which can ensure that the simulation detection seat and the components (such as the pressing rod) thereon remain stable during testing, reducing errors caused by vibration or shaking.

[0031] The screw rod cooperates with the threaded hole on the mounting plate, allowing the user to conveniently adjust the height of the screw rod by rotating the operating rod, thereby controlling the abutting force of the abutting portion against the transparent pressure cover. This design makes the testing process more flexible and can adapt to simulation detection seats of different specifications or different testing needs.

[0032] The simulation detection seat includes a cylindrical sleeve located at the outer periphery and a cylindrical hole column located at the inner side, and the inner wall of the cylindrical sleeve and the outer wall of the cylindrical hole column have internal threads and external threads, respectively, which are threadedly matched with each other.

[0033] The upper part of the inner wall of the cylindrical sleeve located in the area with internal threads and the upper part of the outer wall of the cylindrical hole column located in the area with external threads form the annular groove.

[0034] Because the lower inner wall of the cylindrical sleeve and the outer wall of the cylindrical bore have mutually threaded internal and external threads, the height or internal space of the simulation test fixture can be adjusted by rotating the sleeve and the bore. This adjustability allows the simulation test fixture to adapt to test pieces of different sizes or with different requirements, improving the versatility and flexibility of the equipment.

[0035] The height of the top surface of the outer wall of the annular groove is 0.2 to 0.5 mm higher than the top surface of the safety valve to be tested after it is installed on the detection hole column.

[0036] Because the top surface of the outer wall of the annular groove is higher than the top surface of the safety valve, a tiny gap is formed between them when the safety valve is mounted on the test port. This gap acts as a vent, allowing the annular groove to effectively release gas from the system during safety valve testing, especially when system pressure increases or rapid depressurization is required. This design helps maintain the stability of the testing environment and ensures the accuracy of the test.

[0037] This invention uses a standard safety valve simulation testing device to accurately simulate the actual working pressure range of the exhaust valve, and a testing method to identify a batch of safety valves with small ranges (pressure range 34-36 kPa, range 2 kPa). These safety valves with small ranges can be randomly used to test the pressure of the exhaust valve in the middle cover to achieve pressure consistency. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the standard safety valve simulation testing device for the valve-controlled lead-acid battery cover in this invention;

[0039] Figure 2 This invention involves randomly testing several safety valve diagrams;

[0040] Figure 3 This invention uses a screened standard safety valve for the quality inspection of valve-controlled lead-acid battery covers.

[0041] The markings in the diagram are: 1-annular groove, 2-vent, 3-safety valve, 4-detection hole column, 5-transparent pressure cap, 6-bracket, 61-base plate, 62-mounting plate, 63-connecting plate, 7-pressure rod, 71-operating rod, 72-top, 8-connecting column, 9-connecting pipe, 10-cylindrical sleeve, 11-venting notch, 12-venting hole, 13-acid filling hole column. Detailed Implementation

[0042] Example 1

[0043] like Figure 1 As shown, the standard safety valve simulation testing device provided by this invention has a safety valve shaped like a cap that mates with the acid filling port of a valve-controlled lead-acid battery during use. The standard safety valve simulation testing device includes:

[0044] The simulation detection seat has a ring-shaped groove 1 on the top surface, a vertical air hole 2 in the middle of the ring-shaped groove 1, and a detection hole column 4 for mounting a safety valve 3 to be detected formed between the ring-shaped groove 1 and the air hole 2; the height of the outer side wall of the ring-shaped groove 1 is higher than the top surface height of the safety valve 3 to be detected after being mounted on the detection hole column 4; and the bottom end of the air hole 2 is used to connect an external air source;

[0045] A transparent cover 5 is used to cover the simulation detection seat, and the transparent cover 5 covers the range of the ring-shaped groove 1, the detection hole column 4, and the air hole 2; an exhaust passage communicating with the ring-shaped groove 5 is arranged at the junction of the top surface of the simulation detection seat and the transparent cover 5, on the outer side wall of the ring-shaped groove 1 of the simulation detection seat, or on the transparent cover 5;

[0046] A pressing rod member includes a bracket 6 fixedly connected with the simulation detection seat, and a pressing rod 7 arranged on the bracket 6 and used for pressing the transparent cover 5.

[0047] Specifically, the side wall of the air hole 2 extends downward to form a connecting column 8 protruding downward from the simulation detection seat, and the bottom of the connecting column 8 has a connecting pipe 9 with a reduced diameter, which is used to connect an external air source. When connecting an external source, the connecting pipe 9 with a reduced diameter can reduce the possibility of gas leakage and ensure the tightness and stability of the connection.

[0048] As shown in Figure 1 The bracket 6 includes a bottom plate 61 sleeved on the connecting column 8 and a mounting plate 62 located above the simulation detection seat, and the bottom plate 61 and the mounting plate 62 are connected through a connecting plate 63. Through the combination of the three plates, the bracket forms a stable structure, which can ensure that the simulation detection seat and the components (such as the pressing rod) thereon remain stable during the test;

[0049] The mounting plate 62 is provided with a threaded hole, and the pressing rod 7 is a screw rod matched with the threaded hole. The screw rod has an operating rod 71 at the top and an abutting portion 72 abutting against the transparent cover 5 at the bottom. The screw rod is matched with the threaded hole on the mounting plate, allowing the user to conveniently adjust the height of the screw rod by rotating the operating rod, thereby controlling the abutting force of the abutting portion against the transparent cover. It can adapt to simulation detection seats of different specifications or different test requirements.

[0050] As shown in Figure 1 The simulation detection seat includes a cylindrical sleeve 10 located at the outer periphery and a cylindrical hole column located at the inner side, and the inner wall of the lower part of the cylindrical sleeve 10 and the outer wall of the cylindrical hole column are respectively provided with internal threads and external threads matched with each other;

[0051] The inner wall of the cylindrical sleeve 10 is located above the upper portion with the internal threaded area, and the outer wall of the cylindrical hole column is located between the upper portion with the external threaded area, forming an annular groove 1. The height or internal space size of the simulation detection seat can be adjusted by rotating the sleeve and the hole column. This adjustability enables the simulation detection seat to adapt to different sizes or different requirements of the tested piece, improving the versatility and flexibility of the device.

[0052] The outer side wall top surface height of the annular groove 1 is 0.2-0.5mm higher than the top surface height after the safety valve 3 to be detected is installed on the detection hole column 4, forming an exhaust notch 11. The annular groove can effectively exhaust the gas in the system during the safety valve test, especially when the system pressure rises or rapid pressure reduction is required.

[0053] The standard safety valve simulation detection device of the present application, when in use, installs the safety valve 3 to be detected on the detection hole column 4, screws on the cylindrical sleeve 10, then covers the transparent gland 5, rotates the operating rod 71 through the threaded hole of the mounting plate 61 to make the top 72 of the pressure rod bottom abut against the transparent gland 5, and introduces the gas source at the connecting pipe 9, to select the safety valve 3 to be detected that meets the conditions as the standard safety valve.

[0054] Example 2

[0055] The quality detection method of the valve-controlled lead-acid battery cover of the present application, the top surface of the valve-controlled lead-acid battery cover has an acid addition hole column 13 (which can serve as an exhaust valve), a safety valve is installed on the acid addition hole column, the safety valve is in the shape of a cap, and the quality detection method of the valve-controlled lead-acid battery cover includes the following steps:

[0056] (1) Select one of the acid addition hole columns 13 of a valve-controlled lead-acid battery cover that meets the quality requirements as a reference, and randomly detect several safety valves, test the safety valve opening pressure in 34-36kPa for subsequent step detection;

[0057] (2) Prepare a standard safety valve simulation detection device for valve-controlled lead-acid battery covers, as shown in Example 1;

[0058] (3) Use the safety valve selected in step (1) to test the standard safety valve simulation detection device prepared in step (2), and use the standard safety valve simulation detection device that meets the opening pressure in 34-36kPa for subsequent step detection;

[0059] (4) Use the standard safety valve simulation detection device that passes the detection in step (3) to detect and screen the standard safety valve, and select the safety valve with an opening pressure in 34-36kPa as the standard safety valve;

[0060] (5) the standard safety valve obtained by step (4) is used for quality detection of the valve-controlled lead-acid battery cover, and if the opening valve pressure of each acid hole column of the valve-controlled lead-acid battery cover to be detected is 30-40 kPa, the valve-controlled lead-acid battery cover to be detected is determined to be qualified.

[0061] Optionally, the demolding slope of the outer side wall of the acid hole column 13 of the valve-controlled lead-acid battery cover selected in step (1) is 0.3-0.6 degrees; and the demolding slope of the outer side wall of the detection hole column 4 of the standard safety valve simulation detection device in step (2) is 0.3-0.6 degrees.

[0062] Preferably, the demolding slope of the outer side wall of the acid hole column 13 of the valve-controlled lead-acid battery cover selected in step (1) is 0.45 degrees; and the demolding slope of the outer side wall of the detection hole column 4 of the standard safety valve simulation detection device in step (2) is 0.45 degrees.

[0063] Specifically, in step (5), each acid hole column 13 is detected 2-3 times, and the opening valve pressure of each time is 30-40 kPa.

[0064] The specific quality detection method is as follows:

[0065] First step:

[0066] The collection of the middle cover standard safety valve, one acid hole column of a qualified middle cover is selected as a reference, the outer side demolding slope of the acid hole column is set to 0.45°, 100 safety valves are randomly detected, the valves with a test pressure in the range of 34-36 kPa and a range of 2 kPa are selected, and the number of the valves can be selected as 20-30.

[0067] Second step:

[0068] The production of the standard safety valve simulation detection device. The outer side demolding slope of the detection hole column 4 is preferably 0.45°, the outer side surface of the detection hole column 4 is mirror treated, the middle is connected to an external air source, a threaded screw is arranged at the lower end of the detection hole column 4, and a transparent cylindrical sleeve 10 is connected. The selected safety valves are randomly tested to simulate the exhaust valve, and the valves meeting the requirements of the range of 34-36 kPa and the range of 2 kPa are selected.

[0069] Third step:

[0070] According to the standard safety valve simulation detection device, the standard safety valve is selected and detected, a certain amount of standard safety valves are selected according to the number of middle covers detected each time, for example, 4 middle covers are selected, that is, 24 exhaust valves, and 2 experiments are needed for each detection hole column 4. 48 standard valves in the range of 34-36 kPa and the range of 2 kPa are selected. Then, each acid hole column (13) is randomly detected 2 times, and the pressure is 30-40 kPa, so that the middle cover is determined to be qualified.

[0071] The test results of different batches are as follows:

[0072] The valve opening pressure data of each acid hole column of the battery cover are detected by using a standard safety valve (34-36 kPa) :

[0073] Table 1

[0074]

[0075] Table 2

[0076]

[0077] Valve 1 is unqualified, which indicates that the quality of the battery cover is unqualified and the battery cover cannot be used.

[0078] Table 3

[0079]

[0080] Table 4

[0081]

[0082] Valve 3 is unqualified, which indicates that the quality of the battery cover is unqualified and the battery cover cannot be used.

[0083] Table 5

[0084]

[0085] Table 6

[0086]

[0087] Valves 4 and 5 are unqualified, which indicates that the quality of the two battery covers is unqualified and the two battery covers cannot be used.

[0088] Table 7

[0089]

[0090] Table 8

[0091]

[0092] In summary, the standard safety valve simulation detection device can accurately simulate the actual working pressure range of the exhaust valve, and the detection method can test a batch of safety valves with small extreme difference (pressure range 34-36 kPa, extreme difference 2 kPa), and these safety valves with small extreme difference can be randomly used for detection of the exhaust valve pressure of the middle cover, so that the consistency of the pressure is achieved.

Claims

1. A method for detecting the quality of a valve-regulated lead-acid battery cover, the top surface of the valve-regulated lead-acid battery cover having an acid hole column, a safety valve being sleeved on the acid hole column, the safety valve being in the shape of a cap, characterized in that, The quality detection method of the valve-controlled lead-acid battery cover comprises the following steps: (1) Select one of the acid holes of a valve-controlled lead-acid battery cover as a reference, and randomly detect several safety valves, and test the opening pressure of the safety valve in 34-36 kPa for subsequent step detection; (2) A standard safety valve simulation detection device for valve-controlled lead-acid battery cover is prepared, which comprises: a simulation detection seat having an annular groove on the top surface, a vertical air hole in the middle of the annular groove, and a detection hole column for installing the safety valve to be detected between the annular groove and the air hole; the height of the outer side wall of the annular groove is higher than the height of the top surface of the safety valve to be detected after being installed on the detection hole column; the bottom end of the air hole is used to connect the air source; a transparent cover, which is used to cover the range of the annular groove, the detection hole column and the air hole; an exhaust passage is provided on the junction of the top surface of the simulation detection seat and the transparent cover, the outer side wall of the annular groove of the simulation detection seat or the transparent cover, which communicates with the annular groove; a pressure rod, comprising a bracket fixedly connected with the simulation detection seat, and a pressure rod arranged on the bracket for pressing the transparent cover; (3) The safety valve selected in step (1) is used to test the standard safety valve simulation detection device prepared in step (2), and the standard safety valve simulation detection device with the opening pressure of 34-36 kPa is used for subsequent step detection; (4) The standard safety valve simulation detection device detected in step (3) is used for detection and screening of the standard safety valve, and the safety valve with the opening pressure of 34-36 kPa is screened as the standard safety valve; (5) The standard safety valve obtained by screening in step (4) is used for quality detection of the valve-controlled lead-acid battery cover, and the opening pressure of each acid hole column of the valve-controlled lead-acid battery cover to be detected is detected by the standard safety valve, and the opening pressure is in the range of 30-40 kPa, then the valve-controlled lead-acid battery cover to be detected is determined to be qualified.

2. The method of claim 1, wherein the quality of the valve-regulated lead-acid battery cover is determined by measuring the mass of the valve-regulated lead-acid battery cover. The demolding slope of the outer side wall of the acid hole column of the valve-controlled lead-acid battery cover selected in step (1) is 0.3-0.6 degrees; the demolding slope of the outer side wall of the detection hole column of the standard safety valve simulation detection device in step (2) is 0.3-0.6 degrees.

3. The quality inspection method for the valve-regulated lead-acid battery cover according to claim 2, characterized in that, The demolding slope of the outer side wall of the acid hole column of the valve-controlled lead-acid battery cover selected in step (1) is 0.45 degrees; the demolding slope of the outer side wall of the detection hole column of the standard safety valve simulation detection device in step (2) is 0.45 degrees.

4. The method of claim 1, wherein the quality of the valve-regulated lead-acid battery cover is determined by measuring the mass of the valve-regulated lead-acid battery cover. In step (5), each acid hole column is detected 2-3 times, and the opening pressure of each time is in the range of 30-40 kPa.

5. The method of claim 1, wherein the quality of the valve-regulated lead-acid battery cover is determined by measuring the mass of the valve-regulated lead-acid battery cover. The side wall of the air hole extends downward to form a connecting column protruding downward from the simulation detection seat, and the bottom of the connecting column has a connecting pipe with a reduced diameter, which is used to connect the air source.

6. The quality inspection method for the valve-regulated lead-acid battery cover according to claim 5, characterized in that, The bracket comprises a bottom plate sleeved on the connecting column and a mounting plate located above the simulation detection seat, and the bottom plate and the mounting plate are connected by a connecting plate; The mounting plate is provided with a threaded hole, and the pressure rod is a screw rod matched with the threaded hole.

7. The quality inspection method for the valve-regulated lead-acid battery cover according to claim 6, characterized in that, The top of the screw rod has an operating rod, and the bottom has an abutting portion abutting against the transparent cover.

8. The method of claim 1, wherein the quality of the valve-regulated lead-acid battery cover is determined by measuring the mass of the valve-regulated lead-acid battery cover. The simulation detection seat comprises a cylindrical sleeve located at the outer periphery and a cylindrical hole column located at the inner side, and the inner wall of the cylindrical sleeve and the outer wall of the cylindrical hole column are respectively provided with inner threads and outer threads which are threadedly matched with each other; The inner wall of the cylindrical sleeve is located above the upper part of the inner thread area, and the outer wall of the cylindrical hole column is located above the upper part of the outer thread area, so as to form the annular groove.

9. The method of claim 1, wherein the quality of the valve-regulated lead-acid battery cover is determined by measuring the mass of the valve-regulated lead-acid battery cover. The height of the top surface of the outer side wall of the annular groove is 0.2-0.5 mm higher than the height of the top surface of the safety valve to be detected after the safety valve is installed on the detection hole column.

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