Maintenance-free storage battery terminal welding release agent and preparation method and welding method thereof

Abstract

The maintenance-free storage battery terminal welding release agent comprises, by weight, 100 parts of distilled water, 4-7 parts of a solution A, 2-3 parts of polyethylene wax and 6-9 parts of ethyl alcohol, and the solution A comprises, by weight, 100 parts of distilled water, 0.4-2 parts of glucose powder, 0.4-1 part of cooked rubber powder, 0.4-2 parts of bentonite, 1-2 parts of sodium silicate, 4-5 parts of cork powder and 1.5-3 parts of aluminum dihydrogen phosphate. By using the release agent, shrinkage pits and lead explosion can be avoided, and the terminal welding quality can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a maintenance-free battery terminal welding release agent and its preparation method, as well as a welding method for the terminals. Background Technology

[0002] Currently, maintenance-free batteries used in parking garages require secondary welding of their terminals during production using terminal molds. After welding, the terminal surface must be smooth and free of shrinkage pits. Currently, our company uses a release agent modified from a spray molding agent used for casting grids. This release agent is obtained by diluting a component A solution with distilled water. Component A is mentioned in invention patent CN103480795B and includes 0.2%~4% glucose, 2%~10% cork powder, 0.2%~2% gluten powder, 0.2%~4% bentonite, 0.5%~3% sodium silicate, 1%~6% aluminum dihydrogen phosphate, and the balance being distilled water. A problem with this release agent in practical use is that when the terminal mold is immersed in it and then welded, shrinkage pits easily appear on the surface of the welded terminals, and lead blasting occasionally occurs. To improve the smoothness of the terminal surface and reduce lead blasting, the release agent needs further optimization. Summary of the Invention

[0003] The purpose of this invention is to provide a maintenance-free battery terminal welding release agent. Using this release agent can prevent shrinkage pits and lead explosions, and can effectively improve the welding quality of the terminals.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A maintenance-free battery terminal welding release agent comprises the following components by weight: 100 parts distilled water, 4-7 parts solution A, 2-3 parts polyethylene wax, and 6-9 parts ethanol. Solution A comprises the following components by weight: 100 parts distilled water, 0.4-2 parts glucose powder, 0.4-1 part cooked glue powder, 0.4-2 parts bentonite, 1-2 parts sodium silicate, 4-5 parts cork powder, and 1.5-3 parts aluminum dihydrogen phosphate.

[0006] Optionally, the maintenance-free battery terminal welding release agent comprises the following components by weight: 100 parts distilled water, 5 parts solution A, 2.5 parts polyethylene wax, and 7 parts ethanol. The solution A comprises the following components by weight: 100 parts distilled water, 1 part glucose powder, 0.5 parts cooked glue powder, 1 part bentonite, 1.5 parts sodium silicate, 4.5 parts cork powder, and 2 parts aluminum dihydrogen phosphate.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned maintenance-free battery terminal welding release agent, comprising the following steps:

[0008] Step S1: Preparation of Solution A: Take the weight of distilled water, add the weight of glucose powder and cooked gum powder, stir evenly, then add the weight of bentonite, stir evenly and let stand for 30-40 minutes, then add the weight of sodium silicate and cork powder in sequence, stir evenly and heat to boiling, cool and let stand for 3 hours, then add the weight of aluminum dihydrogen phosphate, mix evenly and set aside for use.

[0009] Step S2: Take 100 parts of distilled water, add 4-7 parts of solution A, 2-3 parts of polyethylene wax, and 6-9 parts of ethanol in sequence, mix and stir for 1-2 minutes, and preheat with a welding gun for 1-2 minutes before use.

[0010] Optionally, the temperature of the welding torch is 1900°C.

[0011] The third objective of this invention is to provide a maintenance-free battery terminal welding method, which uses the aforementioned maintenance-free battery terminal welding release agent and welds the terminals according to the following process: preheat the welding terminal mold with a welding gun for 1-2 minutes, and then immerse it in the release agent for 1-2 seconds. The terminal mold is made of iron. After welding the first terminal, immerse the mold in the release agent again for 1-2 seconds, remove the mold, and continue welding the second terminal. This process is repeated.

[0012] In the above technical solution, the dissolved adhesive powder in solution A enhances the adhesion of the terminal welding release agent. Adding an appropriate amount of glucose further increases the viscosity with increasing temperature, allowing for better adhesion to the terminal welding mold and preventing detachment. Adding appropriate amounts of bentonite and sodium silicate further increases the adhesive strength of the release agent. Adding an appropriate amount of aluminum dihydrogen phosphate improves the coating's resistance to peeling and its resistance to high-temperature liquid erosion, as described in invention patent CN103480795 B. Analysis revealed that the shrinkage pits and lead explosions in existing release agents composed of solution A and water are caused by the interaction between the water in the release agent and the high-temperature lead liquid. Adding ethanol allows the ethanol to quickly evaporate the water after the high-temperature terminal mold is immersed in and removed, while the remaining components adhere to the surface of the terminal mold, forming a protective film. This prevents further interaction between water and the high-temperature lead liquid, effectively reducing shrinkage pits and lead explosions. Polyethylene wax further enhances the release effect and the smoothness of the terminal surface, significantly improving the yield of welded terminals. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the temperature measuring points on the terminal mold;

[0014] Figure 2 Photographs of terminals after welding using the release agent of this invention;

[0015] Figure 3Photograph of the terminal after soldering with release agent of Comparative Example 1. Detailed Implementation

[0016] The present invention will be further illustrated below through specific embodiments:

[0017] Step 1: Preparation of Solution A

[0018] Take 100g of distilled water, add 0.4-2g of glucose powder and 0.4-1g of cooked gum powder, stir well, then add 0.4-2g of bentonite, stir well and let stand for 30-40 minutes. Then add 1-2g of sodium silicate and 4-5g of cork powder, stir well and heat to boiling. After cooling and standing for 3 hours, add 1.5-3g of aluminum dihydrogen phosphate, mix well and set aside.

[0019] Step 2: Preparation of terminal welding release agent

[0020] Take 100g of distilled water, add 4-7g of solution A, 2-3g of polyethylene wax, and 6-9g of ethanol in sequence, mix and stir for 1-2 minutes, and preheat with a welding torch for 1-2 minutes before use. The temperature of the welding torch flame is around 1900℃. Preheating the release agent allows it to heat up quickly, which is beneficial for the polyethylene wax to dissolve better and form a homogeneous liquid.

[0021] Terminal welding process: Preheat the terminal welding mold with a welding gun for 1-2 minutes. After preheating, immerse it in the release agent for 1-2 seconds. The terminal mold is made of iron, which easily absorbs moisture from the air and may rust when placed. Preheating the terminal mold before welding the first terminal each time effectively removes moisture from the mold. Immersing it in the release agent has an annealing effect, which helps to remove rust and other impurities from the terminal surface, while also adhering to the release agent. After welding the first terminal, immerse the mold in the release agent again for 1-2 seconds, remove the mold, and continue welding the second terminal. Repeat this process.

[0022] Example 1

[0023] Preparation of solution A: Take 100g of distilled water, add 1g of glucose powder and 0.5g of cooked gum powder, stir well, then add 1g of bentonite, stir well and let stand for 35 minutes, then add 1.5g of sodium silicate and 4.5g of cork powder in sequence, stir well and heat to boiling, cool and let stand for 3 hours, then add 2g of aluminum dihydrogen phosphate and mix well.

[0024] Preparation of terminal welding release agent: Take 100g of distilled water, add 5g of solution A, 2.5g of polyethylene wax and 7g of ethanol in sequence, mix and stir for 1-2 minutes, and preheat with a welding gun for 2 minutes before use.

[0025] Comparative Example 1

[0026] Compared with Example 1, the preparation of Solution A was the same; ethanol and polyethylene wax were not added when preparing the terminal welding release agent, and the rest were the same.

[0027] Comparative Example 2

[0028] Distilled water is used as a release agent (or distilled water is used to cool the terminal mold).

[0029] Welding effect test:

[0030] Welding was performed using the release agents of Example 1, Comparative Examples 1 and 2, following the aforementioned terminal welding process. Figure 1 Temperature measurements were taken at three locations of the terminal mold, namely temperature measuring point 1, temperature measuring point 2, and temperature measuring point 3. The results are shown in Table 1. The three data points in Table 1 are the temperatures of temperature measuring point 1, temperature measuring point 2, and temperature measuring point 3 after the lead liquid in the terminal mold is filled. The temperature after cooling is the terminal mold temperature measured after the terminal mold is immersed in the release agent after demolding.

[0031] Table 1. Temperature comparison at the start of terminal mold welding and after immersion in release agent.

[0032]

[0033] As shown in Table 1, the initial temperature values ​​at the three temperature measurement points in Example 1 and Comparative Example 1 are higher than the corresponding temperature values ​​in Comparative Example 2. Therefore, it is not necessary to preheat the terminal mold with a spray gun again when it is re-welded, saving time. The temperature after cooling in Example 1 (123°C) is lower than that in Comparative Example 1 (178°C). This is because the ethanol in Example 1 causes the water to evaporate quickly. The advantage is that it avoids water residue on the terminal mold from affecting the smoothness of the terminal surface or causing lead blasting. In Comparative Example 1, because there is no ethanol, the water evaporates slowly, and there is still a certain amount of water in the release agent when it is used, which leads to shrinkage pits and occasional lead blasting (if solution A is not diluted with water, it is too viscous to be used). Figure 2 For terminals soldered using the release agent of Example 1, Figure 3 For terminals welded using the release agent of Comparative Example 1, it is visible that... Figure 2 Terminal pitting in the middle relative to Figure 3 The number of terminals is significantly reduced, and the surface smoothness is greatly improved, fully meeting the welding requirements of the terminals. If the distilled water of Comparative Example 2 is used to cool the welded terminals, the temperature of the terminal mold after cooling (i.e., after being removed from the water) is 107 degrees Celsius. This temperature requires the terminal mold to be preheated again, which consumes time, and demolding is difficult after the weld is completed.

Claims

1. A maintenance-free battery terminal welding release agent, characterized in that... The solution comprises the following components by weight: 100 parts distilled water, 4-7 parts solution A, 2-3 parts polyethylene wax, and 6-9 parts ethanol. Solution A comprises the following components by weight: 100 parts distilled water, 0.4-2 parts glucose powder, 0.4-1 part calcined rubber powder, 0.4-2 parts bentonite, 1-2 parts sodium silicate, 4-5 parts cork powder, and 1.5-3 parts aluminum dihydrogen phosphate.

2. The method for preparing the maintenance-free battery terminal welding release agent according to claim 1, characterized in that... The solution comprises the following components by weight: 100 parts distilled water, 5 parts solution A, 2.5 parts polyethylene wax, and 7 parts ethanol. Solution A comprises the following components by weight: 100 parts distilled water, 1 part glucose powder, 0.5 parts calcined gum powder, 1 part bentonite, 1.5 parts sodium silicate, 4.5 parts cork powder, and 2 parts aluminum dihydrogen phosphate.

3. The method for preparing the maintenance-free battery terminal welding release agent according to claim 1, characterized in that... Includes the following steps: Step S1: Preparation of Solution A: Take the weight of distilled water, add the weight of glucose powder and cooked gum powder, stir evenly, then add the weight of bentonite, stir evenly and let stand for 30-40 minutes, then add the weight of sodium silicate and cork powder in sequence, stir evenly and heat to boiling, cool and let stand for 3 hours, then add the weight of aluminum dihydrogen phosphate, mix evenly and set aside for use. Step S2: Take 100 parts of distilled water, add 4-7 parts of solution A, 2-3 parts of polyethylene wax, and 6-9 parts of ethanol in sequence, mix and stir for 1-2 minutes, and preheat with a welding gun for 1-2 minutes before use.

4. The method for preparing the maintenance-free battery terminal welding release agent according to claim 3, characterized in that, The temperature of the welding gun is 1900℃.

5. A method for welding terminals of a maintenance-free storage battery, characterized in that... Using the maintenance-free battery terminal welding release agent as described in claim 2, the terminals are welded out according to the following process: preheat the welding terminal mold with a welding gun for 1-2 minutes, and then immerse it in the release agent for 1-2 seconds. The terminal mold is made of iron material. After welding the first terminal, immerse the mold in the release agent again for 1-2 seconds, remove the mold, and continue welding the second terminal. This process is repeated.

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