Lead-acid storage battery repair liquid as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of lead-acid storage batteries, and particularly discloses lead-acid storage battery repair liquid as well as a preparation method and application thereof. The acid storage battery repair liquid is prepared by the following steps: S1, preparing a repair stock solution A, wherein the repair stock solution A comprises the following components in percentage by mass: 10-20% of nanoscale fumed silica, 70-80% of pure water and 2-10% of hydroxylamine sulfate; s2, preparing finished product liquid B, wherein the finished product liquid B is prepared from the following components in percentage by mass: 5-15% of repairing stock solution A, 60-90% of dilute sulphuric acid and 0.2-0.5% of phosphoric acid. By optimizing the preparation and application methods of the lead-acid storage battery repair liquid, the service life of the battery is effectively prolonged, and the risk that the storage battery generates solid waste is reduced. In addition, the repairing liquid is rich in formula medicine source, low in cost and relatively simple in preparation process.

Description

Technical Field

[0001] The present invention belongs to the technical field of lead-acid batteries, and particularly relates to a repair fluid for lead-acid batteries, a preparation method thereof, and an application thereof. Background Art

[0002] Due to the shortage of energy resources, serious environmental pollution, greenhouse effect, etc., the new energy industry has been increasingly concerned by people at present. As a device for energy storage and conversion, the battery has attracted more attention. Lead-acid batteries occupy a crucial position in the field of secondary batteries due to their excellent performance-price ratio. After more than 160 years of development, lead-acid batteries have the characteristics of rich raw material sources, high safety and reliability, high recycling rate, large capacity, low price, etc. They are suitable for both floating charge use and starting and cycling use. Therefore, lead-acid batteries are widely used in fields such as standby power supplies, energy storage, and power sources.

[0003] Although the technology of lead-acid batteries is relatively mature, due to factors such as the characteristics of its own electrochemical performance, production process control, and non-standard use process, the capacity of the batteries in operation decays, failing to meet the backup power safety requirements, resulting in the premature retirement of the batteries and the risk of solid waste pollution. In response to these problems, experts at home and abroad have studied the failure modes of lead-acid batteries, made targeted improvements, improved the service life of the batteries, and reduced the risk of pollution caused by battery scrapping. The failure modes of batteries are generally divided into mechanical damage (such as shell cracking, leakage, etc.), water loss, positive plate grid corrosion and fracture, positive electrode lead paste softening, negative electrode sulfation, etc. Excluding mechanical damage and severe positive plate grid corrosion and fracture failures, the discharge capacity of deteriorated batteries with water loss, positive electrode lead paste softening, and negative electrode sulfation failures can be improved by means of repair.

[0004] Patent application CN 117013111A discloses a preparation method and a use method of an activator for a failed lead-acid battery. First, the prepared activator is added to the battery to be repaired, and then activation is carried out to achieve the purpose of repairing the battery. However, the disadvantage of this solution is that the various types of drugs added to the prepared activator at one time cannot be effectively dispersed and mixed, affecting the performance of the drugs and ultimately affecting the repair effect of the drugs. In addition, the internal resistance of the repaired battery increases, and there is a problem of a short secondary service life.

[0005] Patent application CN107611493A discloses a two-phase combined additive for lead-acid batteries, describing the preparation method of the repair fluid. However, its disadvantage is that the preparation process is relatively complex, and the definition of the repair fluid and the repair procedure is lacking, and the repair performance of the product cannot be maximized.

[0006] Therefore, how to obtain a lead-acid battery repair preparation with good repair effect and simple preparation has become a problem to be solved. Summary of the Invention

[0007] The object of the present invention is to improve the deficiencies in the prior art and provide a lead-acid battery repair fluid, which can effectively extend the service life of the battery and reduce the risk of solid waste generation in the battery.

[0008] To achieve the above object, the specific technical solutions adopted by the present invention are as follows:

[0009] In the first aspect, the present invention provides a preparation method of a lead-acid battery repair fluid, comprising the following steps:

[0010] S1. Prepare repair stock solution A, which contains the following components by mass percentage: 10-20% of nano-sized fumed silica, 70-80% of pure water, and 2%-10% of hydroxylamine sulfate;

[0011] S2. Prepare finished product solution B, which contains the following components by mass percentage: 5-15% of repair stock solution A, 60-90% of dilute sulfuric acid, and 0.2%-0.5% of phosphoric acid.

[0012] Further, in step S1, the preparation method of the repair stock solution A is as follows: Weigh each component raw material by mass percentage. First, premix nano-sized fumed silica and hydroxylamine sulfate, and then add pure water in batches. This process is operated in stages by controlling the negative pressure and the mixing temperature. The specific details are shown in the following table:

[0013]

[0014] During the whole process, the stirring linear velocity is maintained at 15-20 m / s, and the repair stock solution A is prepared by stirring.

[0015] Further, in step S2, the preparation method of the finished product solution B is as follows: Gradually add the prepared repair stock solution A into the dilute sulfuric acid solution, and stir for 5-10 min. Then, perform ultrasonic oscillation in a water bath at 40-60 °C for 0.5 h. Finally, add phosphoric acid and continue to stir for 1-2 min. The stirring linear velocity is maintained at 10-15 m / s to prepare the finished product solution B.

[0016] Further, in step S2, the concentration of the dilute sulfuric acid is 1.2-1.25 g / ml (under the condition of 25 °C).

[0017] In the second aspect, the present invention provides a lead-acid battery repair fluid prepared by the above preparation method.

[0018] Thirdly, the present invention provides an application of the above lead-acid battery repair liquid in repairing deteriorated batteries. The application (usage) method of the lead-acid battery repair liquid is to add the finished liquid B to the deteriorated battery at a rate of 1-1.5 ml / Ah and perform charge and discharge repair; the deteriorated battery is a battery excluding mechanical damage or severe corrosion failure of the positive electrode.

[0019] Furthermore, after adding the repair liquid, the battery is subjected to a negative pressure treatment to facilitate the full contact of the finished liquid B with the active substances of the battery.

[0020] Furthermore, the steps of the charge and discharge repair are shown in the following table:

[0021]

[0022] The present invention has the following beneficial effects:

[0023] The repair liquid formula adopted by the present invention has rich sources of drugs and low cost; the production process is relatively simple, and after simple process training, the operators can operate; for floating charge type and cyclic type batteries, the capacity after repair is significantly improved, effectively extending the battery service life. The application of the present invention can effectively reduce the risk of solid waste pollution of the battery, reduce the use cost invested by the owner, and has remarkable environmental and economic benefits. Detailed Embodiments

[0024] The present invention will be further described below in conjunction with specific embodiments.

[0025] Embodiment 1

[0026] A lead-acid battery repair liquid is prepared according to the following steps:

[0027] S1. Prepare the repair stock solution A

[0028] The repair stock solution A contains the following components by mass percentage: 10% of nano-scale fumed silica, 80% of pure water, and 10% of hydroxylamine sulfate. The preparation method is: weigh each component raw material according to the mass percentage, premix the nano-scale fumed silica and hydroxylamine sulfate, and then add pure water in batches. The mixing process is as follows:

[0029]

[0030]

[0031] During the whole process, the stirring linear velocity is kept at 15 m / s, and the repair stock solution A is prepared by stirring.

[0032] S2. Prepare the finished liquid B

[0033] The finished liquid B contains the following components by mass percentage: 9.5% of the repair stock solution A, 90% of dilute sulfuric acid (1.2 - 1.25 g / ml, @25°C), and 0.5% of phosphoric acid. The preparation method is as follows: Take 9.5% of the prepared repair stock solution A, gradually add it to the 90% dilute sulfuric acid solution, and stir for 5 minutes. Then, ultrasonically oscillate in a water bath at 40 - 60°C for 0.5 hours. Finally, add 0.5% of phosphoric acid and continue to stir for 1 minute, with the linear stirring speed maintained at 10 m / s to prepare the finished liquid B.

[0034] Apply the prepared lead - acid battery repair liquid to battery repair, and the method is as follows:

[0035] Take 3 deteriorated 12V100Ah batteries (batteries put into use in the same batch, with similar internal resistance and initial capacity before repair), and mark them as battery A, battery B, and battery C respectively.

[0036] Add repair liquid B (100 ml / cell) to battery A. After running according to the charge / discharge repair procedure, detect the battery capacity. The charge / discharge repair procedure is shown in the following table:

[0037]

[0038] Do not add the finished liquid B to battery B. After running according to the charge / discharge repair procedure, detect the battery capacity;

[0039] Do not add the finished liquid B to battery C. Charge it according to the manufacturer's charging method and detect the capacity.

[0040] The capacity detection results are shown in the following table:

[0041]

[0042] Example 2

[0043] A lead - acid battery repair liquid is prepared according to the following steps:

[0044] S1. Prepare the repair stock solution A

[0045] The repair stock solution A contains the following components by mass percentage: 20% of nano - scale fumed silica, 78% of pure water, and 2% of hydroxylamine sulfate. The preparation method is as follows: Weigh each component raw material according to the mass percentage. First, premix the nano - scale fumed silica and hydroxylamine sulfate, and then add pure water in batches. The mixing process is as follows:

[0046]

[0047] Maintain the linear stirring speed at 20 m / s throughout the process and stir to prepare the repair stock solution A.

[0048] S2. Prepare the finished liquid B

[0049] The finished product liquid B contains the following components by mass percentage: 15% of the repair stock solution A, 84.8% of dilute sulfuric acid (1.2 - 1.25 g / ml, @25°C), and 0.2% of phosphoric acid. The preparation method is as follows: Take 15% of the prepared repair stock solution A, gradually add it to the 84.8% dilute sulfuric acid solution, stir for 5 minutes, then ultrasonically oscillate in a water bath at 40 - 60°C for 0.5 h, finally add 0.2% of phosphoric acid, and continue to stir for 1 minute, keeping the linear stirring speed at 15 m / s to make the finished product liquid B.

[0050] The prepared lead - acid battery repair liquid is applied to battery repair as follows:

[0051] Take 3 deteriorated 12V100Ah batteries (batteries put into use in the same batch, with similar internal resistance and initial capacity before repair), and label them as battery Ding, battery Wu, and battery Ji respectively.

[0052] Add repair liquid B (150 ml / single cell) to battery Ding, and after running according to the same charge / discharge repair procedure as in Example 1, detect the battery capacity;

[0053] Do not add the finished product liquid B to battery Wu, run according to the charge / discharge repair procedure, and then detect the battery capacity;

[0054] Do not add the finished product liquid B to battery Ji, charge it according to the manufacturer's charging method, and detect the capacity.

[0055] The capacity detection results are shown in the following table:

[0056]

[0057] Continue to conduct life cycle tests on battery Jia and battery Ding. After 35 cycles, the cycle capacity of battery Jia is lower than 80 Ah, and after 22 cycles, the cycle capacity of battery Ding is lower than 80 Ah. Compared with the original cycle life of the comparative battery (calculated based on the cycle life of 60 times for floating - charge batteries), the life of battery Jia has increased by 58.3%, and the cycle life of battery Ding has increased by 36.7%.

[0058] It can be seen from the above embodiments that the lead - acid battery repair liquid of the present invention can effectively improve the remaining capacity of deteriorated batteries and extend the service life of the batteries.

[0059] This specific implementation manner is only an explanation of the present invention, not a limitation of the present invention. Any changes made by those skilled in the art after reading the specification of the present invention, as long as they are within the scope of the claims of the present invention, will be protected by the patent law.

Claims

1. A preparation method of a lead-acid battery repair liquid, characterized in that, It includes the following steps: S1. Prepare the repair stock solution A, which contains the following components by mass percentage: 10 - 20% of nano - scale fumed silica, 70 - 80% of pure water, and 2% - 10% of hydroxylamine sulfate; S2. Prepare the finished product solution B, which contains the following components by mass percentage: 5 - 15% of repair stock solution A, 60 - 90% of dilute sulfuric acid, and 0.2% - 0.5% of phosphoric acid.

2. The preparation method of the lead-acid battery repair liquid according to claim 1, characterized in that In step S1, the preparation method of the repair stock solution A is as follows: Weigh each component raw material according to the mass percentage. First, premix the nano - scale fumed silica and hydroxylamine sulfate, and then add pure water in batches. This process is carried out in stages under negative pressure and by controlling the mixing temperature, and the specific operations are as shown in the following table: During the whole process, the stirring linear velocity is maintained at 15 - 20 m / s, and the repair stock solution A is prepared by stirring.

3. The preparation method of the lead-acid battery repair fluid according to claim 1, characterized in that, In step S2, the preparation method of the finished product solution B is as follows: Gradually add the prepared repair stock solution A into the dilute sulfuric acid solution, and stir for 5 - 10 min. Then, perform ultrasonic oscillation in a water bath at 40 - 60 °C for 0.5 h. Finally, add phosphoric acid and continue to stir for 1 - 2 min. The stirring linear velocity is maintained at 10 - 15 m / s to prepare the finished product solution B.

4. The preparation method of the lead-acid battery repair liquid according to claim 1, characterized in that, In step S2, the concentration of the dilute sulfuric acid is 1.2 - 1.25 g / ml.

5. The lead - acid battery repair liquid prepared by the preparation method according to any one of claims 1 - 4.

6. Use of the lead-acid battery repair liquid according to claim 5 in repairing deteriorated batteries, characterized in that, The application method is to add the finished product solution B to the deteriorated battery at 1 - 1.5 ml / Ah for charge - discharge repair; the deteriorated battery is a battery excluding mechanical damage or severe corrosion and failure of the positive electrode.

7. The application according to claim 6, wherein Perform negative - pressure treatment on the battery after adding the repair liquid.

8. The application according to claim 7, wherein The steps of the charge - discharge repair are as shown in the following table:

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