CN105273864A - Cleaner for alkaline battery and application thereof, and alkaline battery appearance cleaning method - Google Patents

Abstract

The invention discloses a cleaning agent for alkaline batteries. The cleaning agent contains a first solvent and a borohydride salt; the first solvent is selected from at least one of water, ammonia water and alcohol. The invention also discloses the application of the cleaning agent in cleaning the appearance of the alkaline battery. The present invention also provides a method for cleaning the appearance of the alkaline battery, the method comprising: contacting the alkaline battery to be cleaned with the cleaning agent described in the present invention, and then cleaning the alkaline battery with a second solvent. The cleaning agent for alkaline batteries can be effectively used to solve the bad appearance of black spots on the battery case caused by alkali creeping, especially for the bad appearance of nickel-plated nickel batteries, especially nickel-hydrogen batteries, etc. .

Description

Cleaning agent for alkaline battery and its application and appearance cleaning method of alkaline battery

technical field

The invention relates to the technical field of alkaline battery manufacturing, in particular to a cleaning agent for alkaline batteries, an application of the cleaning agent for alkaline batteries in the appearance cleaning of alkaline batteries, and an appearance cleaning of alkaline batteries method.

Background technique

Alkaline electrolytes containing potassium hydroxide, lithium hydroxide, etc. often climb up the inner wall of the shell, climb up the shell wall, and climb over the seal. This situation is generally called alkali creep. The contact surfaces of the seals of the alkaline storage battery containing the alkaline electrolyte are generally not a real plane, and there are many capillary channels in it, which will cause the alkaline electrolyte contained therein to overflow through the alkali creeping phenomenon, As a result, black spots appear on the surface of the battery, forming a bad appearance. The surface of the used and reworked alkaline batteries is more prone to black spots caused by creeping alkali.

In the prior art, in order to minimize the occurrence of alkali creeping phenomenon, the sealing effect is often improved by applying sealing glue, improving the sealing structure and sealing process, and improving the sealing ring. However, due to the electrocapillary phenomenon, improving the sealing effect cannot prevent the occurrence of alkali creeping phenomenon. This requires research on the removal of black spots due to the phenomenon of alkali creep.

In the prior art, ultrasonic vibration or grinding is often used to remove the black spots on the battery casing due to alkali creeping phenomenon. However, long-term ultrasonic vibration or long-term grinding will affect the performance of the battery. Therefore, there is an urgent need to find a new and effective method for removing black spots on batteries, especially reworked battery casings due to alkali creep phenomenon.

Contents of the invention

The object of the present invention is to provide a cleaning agent for alkaline batteries, which can be effectively used to solve the poor appearance of black spots on the battery casing caused by alkali creep without affecting the performance of the battery Phenomenon, especially for nickel-plated nickel batteries, especially nickel-metal hydride batteries, etc., have a significant effect on the appearance of poor appearance.

In order to achieve the above object, on the one hand, the present invention provides a cleaning agent for alkaline batteries, which contains a first solvent and a borohydride salt; the first solvent is selected from at least one of water, ammonia and alcohol kind.

On the other hand, the present invention also provides an application of the above-mentioned cleaning agent in cleaning the appearance of alkaline batteries.

On the other hand, the present invention also provides a method for cleaning the appearance of an alkaline battery, the method comprising: contacting the alkaline battery to be cleaned with the cleaning agent described in the present invention, and then cleaning the alkaline battery with a second solvent. Battery.

By adopting the above-mentioned cleaning agent for alkaline batteries provided by the present invention to clean the bad phenomenon of black spots on the appearance of alkaline batteries caused by the phenomenon of alkali creeping, especially, it has a good cleaning effect on the black spots on the reworked alkaline battery shells . The inventor of the present invention believes that the mechanism of the present invention may be that the borohydride used can react with the solvent to generate hydrogen, and the bubbles generated will drive the movement of the surrounding solution molecules in order to be released, thereby promoting the improvement of the appearance of the alkaline battery. The removal of black spots, and the nickel of nickel-plated batteries has a catalytic effect on the generation of hydrogen. Therefore, the present invention has a good effect on the removal of black spots on the appearance of nickel-plated alkaline batteries.

When the cleaning agent and the cleaning method of the present invention are used to clean the bad appearance black spots of the alkaline battery, it also has the advantages of simplicity and effectiveness without affecting the performance of the battery. The method avoids the defect that the performance of the battery (such as electric capacity) is reduced when the ultrasonic vibration or grinding method of the prior art is used.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

detailed description

Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In one aspect, the present invention provides a cleaning agent for alkaline batteries, which contains a first solvent and a borohydride salt; the first solvent is at least one selected from water, ammonia water and alcohol.

The alcohol described in the present invention can be various commonly used alcohol solvents, for example, the preferred alcohol described in the present invention can be ethanol, cyclohexanol and the like.

The above-mentioned cleaning agent for alkaline batteries provided by the present invention can be used to solve the poor appearance of black spots on the battery casing caused by alkali creep, especially for nickel-plated nickel batteries, especially nickel-hydrogen batteries, etc. The effect of the phenomenon is obvious.

Preferably, in the cleaning agent provided by the present invention, the borohydride salt may be at least one selected from alkali metal borohydride salts, alkaline earth metal borohydride salts and ammonium borohydride.

More preferably, the borohydride salt is at least one selected from potassium borohydride, sodium borohydride, lithium borohydride and ammonium borohydride.

Particularly preferably, the borohydride salt is at least one selected from potassium borohydride, sodium borohydride and lithium borohydride.

The most preferred borohydride salt in the present invention is a mixture of potassium borohydride and sodium borohydride, and preferably the molar ratio of potassium borohydride to sodium borohydride is 0.5-2:1.

In the cleaning agent for alkaline batteries of the present invention, preferably, the first solvent is water.

In the cleaning agent for alkaline batteries of the present invention, the concentration of the borohydride salt in the cleaning agent can be 0.01-0.8mol/L, preferably the concentration of the borohydride salt in the cleaning agent is 0.05-0.5 mol/L. In the method of the present invention, when the concentration of the borohydride salt is greater than 0.8mol/L, it will not bring bad results, but only cause waste of raw materials. The present invention considers comprehensively reducing costs and achieving the cleaning effect as soon as possible Preferably the concentration of the borohydride salt is not greater than 0.8 mol/L.

On the other hand, the present invention also provides an application of the above-mentioned cleaning agent in cleaning the appearance of alkaline batteries.

On the other hand, the present invention also provides a method for cleaning the appearance of an alkaline battery, the method comprising: contacting the alkaline battery to be cleaned with the cleaning agent described in the present invention, and then cleaning the alkaline battery with a second solvent. Battery.

When adopting the above-mentioned method of the present invention to clean alkaline batteries, especially when cleaning the alkaline batteries that are repaired, especially when cleaning alkaline batteries with black spots caused by alkali creeping phenomenon, obvious effects can be obtained. The appearance of the battery after cleaning by the method has no bad phenomenon, and the cleaning method of the present invention does not affect the performance of the alkaline battery.

In the method of the present invention, on the basis of not affecting the performance of the battery, ultrasonic waves can be used moderately or methods such as oscillation and stirring can be used to speed up the removal of black spots caused by alkali creep.

Preferably, in the method for cleaning the appearance of the present invention, the contact time is not particularly limited, the preferred contact time of the present invention is to make the appearance of the alkaline battery clean, and the present invention is more preferably such that The black spots on the outer surface of the alkaline battery are removed.

In order to have a better cleaning effect, it is preferable to soak the alkaline battery to be cleaned in the cleaning agent of the present invention for contacting.

In the present invention, in order to soak the alkaline battery to be cleaned in the cleaning agent of the present invention, the cleaning agent of the present invention should at least not pass through the alkaline battery to be cleaned, and the volume of the cleaning agent should be greater than The volume of the alkaline battery, preferably the volume ratio of the cleaning agent to the alkaline battery is 1-10:1, in order to save the amount of cleaning agent as much as possible and to ensure the cleaning effect, the preferred volume ratio of the cleaning agent to the alkaline battery is 1.5-2.5 :1.

Preferably, in the appearance cleaning method of the present invention, the contacting conditions include: the contacting temperature may be 5-45°C; more preferably the contacting temperature is 20-30°C.

In the method for cleaning the appearance of the present invention, the alkaline batteries to be cleaned should be separated from each other to prevent the batteries from being connected in series due to stacking and the problem of electrolytic cleaning agents.

In the appearance cleaning method of the present invention, the purpose of cleaning the alkaline battery with the second solvent is to clean and remove the cleaning agent that may remain on the surface of the alkaline battery. In the present invention, the alkaline battery is preferably cleaned with the second solvent. The pH value of the battery to the second solvent is 6-7, more preferably the pH value is 7. In the present invention, cleaning the alkaline battery with the second solvent until the pH value of the second solvent is 6-7 refers to cleaning the alkaline battery with the second solvent, and monitoring and cleaning the alkaline battery at any time. The pH value of the second solvent after the battery, until the pH value of the second solvent is 6-7, stop cleaning.

The appearance cleaning method of the present invention can be used to clean all the black spots on the battery surface caused by the phenomenon of alkali creeping. Preferably, the alkaline battery to be cleaned in the present invention is an alkaline nickel battery; more preferably the The alkaline nickel battery includes a positive terminal cover and a negative shell, and the outer surfaces of the positive terminal cover and the negative shell are plated with a nickel layer.

The appearance cleaning method of the present invention may further include removing the second solvent after cleaning the alkaline battery with the second solvent, and then coating the outer surface of the alkaline battery with an oil coating layer. In the present invention, the type of the oil coating layer is not particularly limited, and may be various oil coating layers commonly used in the present invention.

In the method for cleaning the appearance of the present invention, the type of the second solvent is not particularly limited, as long as it can be used to remove the cleaning agent that may remain on the surface of the alkaline battery and does not affect the surface of the alkaline battery. It is sufficient that the performance is adversely affected. In the present invention, preferably, the second solvent may be at least one of water, acetone and ethanol.

According to a preferred embodiment of the present invention, the appearance cleaning method may include the following steps:

(1) configure the borohydride salt solution of 0.01mol/L-0.8mol/L with the first solvent;

(2) Soak the alkaline battery to be cleaned in the borohydride salt solution obtained in step (1) at 5-45°C until the appearance of the alkaline battery is cleaned;

(3) washing the alkaline battery obtained in step (2) with a second solvent until the pH of the second solvent is 6-7;

(4) The alkaline battery obtained in step (3) is removed from the second solvent, and then an oil-coated layer is coated on the outer surface of the alkaline battery.

The present invention will be described in detail below by way of examples. In the following examples, unless otherwise specified, all reagents used are commercially available chemically pure reagents.

In the following examples, the used alkaline batteries to be cleaned are alkaline nickel batteries with black spots of the same area (about 1/10 of the battery area), and are reworked alkaline nickel batteries, the models of which are Sub- Type C; in the following examples, the water used is deionized water.

Example 1

This embodiment is used to illustrate the appearance cleaning method of the alkaline battery of the present invention. The method includes the following steps:

(1) A mixed solution of 0.25mol/L potassium borohydride and sodium borohydride is configured with water (and the molar ratio of potassium borohydride and sodium borohydride is 1:1);

(2) At 25°C, soak the alkaline battery to be cleaned in the mixed solution of potassium borohydride and sodium borohydride obtained in step (1) until the black spots are removed (cleaning agent has not passed the alkaline battery, and The volume ratio of cleaning agent to alkaline battery is 2.5:1);

(3) washing the alkaline battery obtained in step (2) with water until the pH of the water is 7;

(4) Remove water from the surface of the alkaline battery obtained in step (3), and then coat an oil-coated layer on the outer surface of the alkaline battery.

It is detected that the time taken from the contact of the alkaline battery with the mixed solution of potassium borohydride and sodium borohydride until the black spots on the surface of the alkaline battery are removed is 5 hours, and the performance of the battery has no adverse effect.

Example 2

This embodiment is used to illustrate the appearance cleaning method of the alkaline battery of the present invention. The method includes the following steps:

(1) configure 0.5mol/L sodium borohydride solution with water;

(2) At 30°C, soak the alkaline battery to be cleaned (the cleaning agent has not passed the alkaline battery, and the volume ratio of the cleaning agent to the alkaline battery is 2:1) and contact it in the sodium borohydride solution until the black spot remove;

(3) washing the alkaline battery obtained in step (2) with water until the pH of the water is 7;

(4) Remove water from the surface of the alkaline battery obtained in step (3), and then coat an oil-coated layer on the outer surface of the alkaline battery.

After testing, it takes 6 hours from the time when the alkaline battery is in contact with the sodium borohydride solution until the black spots on the surface of the alkaline battery are removed, and the performance of the battery has no adverse effect.

Example 3

This embodiment is used to illustrate the appearance cleaning method of the alkaline battery of the present invention. The method includes the following steps:

(1) Potassium borohydride solution of 0.05mol/L is configured with water;

(2) At 5°C, soak the alkaline battery to be cleaned (the cleaning agent has not passed the alkaline battery, and the volume ratio of the cleaning agent to the alkaline battery is 1.5:1) and contact it in potassium borohydride solution until black spots remove;

(3) washing the alkaline battery obtained in step (2) with water until the pH of the water is 6.7;

(4) Remove water from the surface of the alkaline battery obtained in step (3), and then coat an oil-coated layer on the outer surface of the alkaline battery.

After testing, it takes 8 hours from the time when the alkaline battery to be cleaned is in contact with the potassium borohydride solution until the black spots on the surface of the alkaline battery are removed, and the battery performance has no adverse effect.

Example 4

This embodiment is used to illustrate the appearance cleaning method of the alkaline battery of the present invention. The method includes the following steps:

(1) A mixed solution of 0.4mol/L potassium borohydride and sodium borohydride is configured with water (and the molar ratio of potassium borohydride and sodium borohydride is 0.5:1);

(2) At 30°C, soak the alkaline battery to be cleaned in the mixed solution of potassium borohydride and sodium borohydride obtained in step (1) until the black spots are removed (the cleaning agent has not passed the alkaline battery, and The volume ratio of cleaning agent to alkaline battery is 2:1);

(3) washing the alkaline battery obtained in step (2) with water until the pH of the water is 7;

(4) Remove water from the surface of the alkaline battery obtained in step (3), and then coat an oil-coated layer on the outer surface of the alkaline battery.

After testing, it takes 6 hours from the time when the alkaline battery is in contact with the mixed solution of potassium borohydride and sodium borohydride until the black spots on the surface of the alkaline battery are removed, and the performance of the battery has no adverse effect.

Example 5

This embodiment uses a method similar to that of Embodiment 3 to illustrate the method for cleaning the appearance of the alkaline battery of the present invention.

The difference is that in this embodiment, both the first solvent and the second solvent used are ethanol.

After testing, it takes 15 hours from the time when the alkaline battery to be cleaned in this embodiment is in contact with the potassium borohydride solution until the black spots on the surface of the alkaline battery are removed, and the battery performance has no adverse effect.

Example 6

This embodiment uses a method similar to that of Embodiment 2 to illustrate the method for cleaning the appearance of the alkaline battery of the present invention.

The difference is that the concentration of the sodium borohydride solution used in this example is 0.01mol/L.

After testing, it takes 12 hours from the time when the alkaline battery to be cleaned in this embodiment is in contact with the sodium borohydride solution until the black spots on the surface of the alkaline battery are removed, and the battery performance has no adverse effect.

Example 7

This example uses a method similar to that of Example 1 to illustrate the method for cleaning the appearance of the alkaline battery of the present invention.

The difference is that the borohydride salt used in this example is sodium borohydride, and the concentration of the sodium borohydride solution is 0.25 mol/L.

After testing, it takes 6 hours from the time when the alkaline battery to be cleaned in this embodiment is in contact with the sodium borohydride solution until the black spots on the surface of the alkaline battery are removed, and the battery performance has no adverse effect.

Example 8

This example uses a method similar to that of Example 1 to illustrate the method for cleaning the appearance of the alkaline battery of the present invention.

The difference is that the borohydride salt used in this example is potassium borohydride, and the concentration of the potassium borohydride solution is 0.25 mol/L.

After testing, it takes 6 hours from the time when the alkaline battery to be cleaned in this embodiment is in contact with the potassium borohydride solution until the black spots on the surface of the alkaline battery are removed, and the battery performance has no adverse effect.

Example 9

This example uses a method similar to that of Example 1 to illustrate the method for cleaning the appearance of the alkaline battery of the present invention.

The difference is that the borohydride salt used in this example is a mixture of potassium borohydride and sodium borohydride (and the molar ratio of potassium borohydride and sodium borohydride is 2.2:1), and the concentration of the formed solution is 0.25 mol/L.

After testing, from the time when the alkaline battery to be cleaned in this embodiment contacts with the mixed solution of potassium borohydride and sodium borohydride, it takes 6 hours until the black spots on the surface of the alkaline battery are removed. adverse effects.

Comparative example 1

This comparative ratio adopts the method that prior art provides to carry out, specifically as follows:

The cleaning agent used in this comparative example is a boric acid solution of 0.5mol/L, and all the other steps are the same as in Example 2.

After testing, from the time when the alkaline battery to be cleaned in this comparative example contacts with the boric acid solution of 0.5mol/L until the black spots on the surface of the alkaline battery are removed is 20 hours, and the battery performance has no adverse effect.

Comparative example 2

This comparative ratio adopts the method that prior art provides to carry out, specifically as follows:

The cleaning agent used in this comparative example is 0.5mol/L boric acid solution, the ultrasonic frequency is 45KHz, the alkaline battery to be cleaned is in contact with the 0.5mol/L boric acid solution, and the rest of the steps are the same as in Example 2.

After testing, from the time when the alkaline battery to be cleaned of this comparative example contacts with the boric acid solution of 0.5mol/L until the black spots on the surface of the alkaline battery are removed is 3 hours, and the battery capacity decays by 4%.

By comparing the data of Examples 1-9 and Comparative Examples 1-2, it can be seen that the defective phenomenon of black spots on the appearance of the alkaline battery caused by the alkali creep phenomenon is cleaned by using the cleaning agent provided by the present invention, especially for repaired It has a good cleaning effect on the black spots on the outer surface of alkaline batteries. When the cleaning agent and the cleaning method of the present invention are used to clean the bad appearance black spots of the alkaline battery, the battery performance is usually not affected. The cleaning method of the present invention also avoids the defect of battery performance degradation caused by ultrasonic vibration or grinding methods in the prior art.

The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention. These simple modifications All belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (10)

1. an alkaline cell clean-out system, is characterized in that, containing the first solvent and borohydride salts in this clean-out system; Described first solvent is selected from least one in water, ammoniacal liquor and alcohol.

2. clean-out system according to claim 1, wherein, described borohydride salts is be selected from least one in basic metal borohydride salts, alkaline-earth metal borohydride salts and ammonium borohydride;

Preferably, described borohydride salts is be selected from least one in POTASSIUM BOROHYDRIDE, sodium borohydride, lithium borohydride and ammonium borohydride;

More preferably, described borohydride salts is POTASSIUM BOROHYDRIDE and sodium borohydride, and the mol ratio of POTASSIUM BOROHYDRIDE and sodium borohydride is 0.5-2:1, and described first solvent is water.

3. clean-out system according to claim 1, wherein, the concentration of the borohydride salts in described clean-out system is 0.01-0.8mol/L, is preferably 0.05-0.5mol/L.

4. the application of the clean-out system in claim 1-3 described in any one in the appearance cleaning of alkaline cell.

5. the appearance cleaning method of an alkaline cell, it is characterized in that, the method comprises: contacted with clean-out system by alkaline cell to be cleaned, then uses alkaline cell described in the second solvent cleaning, and described clean-out system is the clean-out system in claim 1-3 described in any one.

6. method according to claim 5, wherein, it is 5-45 DEG C that the condition of described contact comprises temperature; Be preferably 20-30 DEG C.

7. method according to claim 5 wherein, is 6-7 by the pH value of alkaline cell to the second solvent described in the second solvent cleaning.

8. method according to claim 5, wherein, described alkaline cell to be cleaned is steel-alkaline battery; Preferred described steel-alkaline battery comprises anode end cap and anode coat, and the outside surface of described anode end cap and anode coat is coated with nickel dam.

9. according to the method in claim 5-8 described in any one, wherein, the method also comprises: after with alkaline cell described in the second solvent cleaning, remove the second solvent; Then on the outside surface of described alkaline cell, coating is coated with oil reservoir.

10. according to the method in claim 5-8 described in any one, wherein, described second solvent is at least one in water, acetone and ethanol.