Method for detecting carbon content in battery negative plate

Abstract

The invention discloses a method for detecting the carbon content in a battery negative plate. The method comprises the following steps: S1, preparing raw materials: preparing a negative plate sample, a nitric acid solution and ammonium acetate; s2, removing lead from the raw material: putting the negative plate sample into an excessive nitric acid solution, and heating the mixture to dissolve lead in the negative plate sample; s3, removing lead sulfate from the raw materials. Lead in the negative plate sample can be effectively dissolved by reacting the negative plate sample with nitric acid, and lead sulfate generated by contact of the negative plate and sulfuric acid can be dissolved by adding ammonium acetate, so that the lead sulfate is prevented from being mixed in carbon to influence a detection result, and the detection accuracy is improved; the reaction solution is heated and stirred, so that the reaction can be fully carried out, residues of lead and lead sulfate are prevented, the filter paper and the carbon are dried, water residues on the surfaces or in the filter paper and the carbon can be prevented, and the detection accuracy is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a method for detecting the carbon content in a negative plate of a battery. Background Art

[0002] The negative plate of a battery is the electrode where the reduction reaction occurs in the battery and plays a key role in the battery's charge and discharge processes. It is typically composed of a variety of materials, primarily including active substances, conductive agents, and binders. The active substance is the primary component involved in the electrochemical reaction, the conductive agent helps improve the electrode's conductivity, and the binder is used to bond the various materials together to form a stable electrode structure. The negative plate of a lead-acid battery is made of spongy lead. During discharge, the lead reacts with sulfuric acid, causing the lead to lose electrons to form lead sulfate, while hydrogen ions in the solution gain electrons to form hydrogen gas. During charging, the lead sulfate is converted back into lead and sulfuric acid under the action of the current.

[0003] The carbon content in the negative plate of a lead-acid battery has a significant impact on battery performance. An appropriate amount of carbon can improve the conductivity of the negative plate, aiding electron transport and thereby enhancing the battery's charge-discharge efficiency and rate capability. Carbon also increases the specific surface area of ​​the electrode material, facilitating sufficient contact between the active material and the electrolyte, and promoting the electrochemical reaction. Furthermore, the presence of carbon can improve the structural stability of the negative plate to a certain extent, mitigate volume changes during charge and discharge, and increase the battery's cycle life. Currently, carbon is commonly added to the negative plate of a lead-acid battery to improve battery performance. However, whether the carbon is evenly distributed within the negative plate requires testing the carbon content to determine.

[0004] Therefore, we propose a method for detecting the carbon content in battery negative plates. Summary of the Invention

[0005] The object of the present invention is to provide a method for detecting the carbon content in the negative plate of a battery. By dissolving the lead in the negative plate sample with a nitric acid solution and then adding ammonium acetate to dissolve the lead sulfate, the carbon in the negative plate sample can be filtered out. After weighing and calculating, the carbon content in the negative plate sample can be obtained. By sampling and detecting multiple positions of the negative plate, the distribution of carbon in the negative plate can be obtained, thereby solving the problems in the prior art raised in the above background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for detecting carbon content in a negative plate of a battery comprises the following steps:

[0008] S1. Raw material preparation: prepare negative plate sample, nitric acid solution and ammonium acetate;

[0009] S2. Lead removal from raw materials: placing the negative plate sample in an excess of nitric acid solution and heating the mixture to dissolve the lead in the negative plate sample;

[0010] S3. Removal of lead sulfate from raw materials: adding ammonium acetate to the mixture and stirring the mixture thoroughly to dissolve the lead sulfate in the negative plate sample;

[0011] S4. Filtration: Weigh the filter paper, filter out the solid in the mixture using the filter paper, and wash the solid with distilled water to obtain a carbon solid;

[0012] S5, drying: drying the filter paper and carbon;

[0013] S6. Weighing: Weigh the filter paper and carbon, subtract the weight of the filter paper to get the mass of the carbon, and then calculate the carbon content.

[0014] Preferably, in S1, the negative plate sample is placed in distilled water for cleaning, and after ensuring that there is no foreign matter on the surface, the surface of the negative plate sample is wiped dry and then transferred to an oven, heated to 50°C-80°C, and dried for 15-20 minutes. After ensuring that there is no moisture residue on the surface, it is taken out and the negative plate sample is cut into small cubes using a shearing tool. The cut negative plate sample is weighed and the data is recorded.

[0015] Preferably, in S1, the nitric acid concentration in the nitric acid solution is 25%. The 25% concentration nitric acid solution belongs to dilute nitric acid. Compared with the reaction of concentrated nitric acid with lead, the reaction of 25% concentration of dilute nitric acid with lead is not very violent, which is convenient for controlling the experimental process and is safer. The ammonium acetate concentration is 40%. If the ammonium acetate concentration is too low, it may cause incomplete dissolution of lead sulfate and fail to achieve the dissolution amount required for the experiment. If the ammonium acetate concentration is too high, although it can improve the dissolution effect of lead sulfate, it may bring some negative effects, such as excessive ionic strength in the solution, which may interfere with subsequent experiments, and the high concentration of ammonium acetate solution is expensive and may also have volatilization problems.

[0016] Preferably, in S2, the mixture is transferred to an oven for heating to 50°C-80°C and maintained for 1-2 hours, so that the lead and the nitric acid solution react fully to generate lead nitrate which dissolves in water, and the ratio of the nitric acid solution to the negative plate sample is greater than 3:1.

[0017] Preferably, in S3, it is necessary to carry out in a well-ventilated environment, and use a stirring device to slowly stir the mixture to avoid splashing of the solution, and maintain it for 1-1.5 hours, so that the lead sulfate and ammonium acetate are fully reacted to generate ammonium sulfate and lead acetate and dissolve in water, and the mass ratio of ammonium acetate to the negative plate sample is greater than 2:1.

[0018] Preferably, in S4, the weight data of the filter paper is recorded, and the mixture is slowly poured onto the filter paper to ensure that no solid remains in the container holding the mixture, the solution permeates the filter paper, and the solid remains on the filter paper.

[0019] Preferably, in S4, the filter paper and the solid on the filter paper are moved, and the solid is poured into distilled water for washing. After washing, the distilled water and the solid are poured over the filter paper for filtering to ensure that no solid remains in the container containing the distilled water.

[0020] Preferably, in said S4, after the solid is poured into distilled water, the distilled water is stirred by a stirring device for 15-20 minutes, and the washing and filtering are repeated multiple times.

[0021] Preferably, in S5, the filter paper and the solid on the filter paper are moved into an oven, and the temperature is heated to 50° C.-80° C. and maintained for 30-45 minutes to completely evaporate the residual water on the surface and inside of the filter paper and the solid.

[0022] Preferably, in S6, the total mass of the filter paper and carbon is weighed and the data is recorded, the mass of the carbon is obtained by subtracting the mass of the filter paper from the total mass of the filter paper and carbon, and the carbon content of the negative plate sample can be obtained by dividing the mass of the carbon by the weight of the negative plate sample.

[0023] Technical effects and advantages of the present invention: Compared with the prior art, the method for detecting the carbon content in the negative plate of a battery proposed by the present invention has the following advantages:

[0024] 1. By reacting the negative plate sample with nitric acid, the lead in the negative plate sample can be effectively dissolved, and by adding ammonium acetate, the lead sulfate produced by the contact between the negative plate and sulfuric acid can be dissolved, thereby avoiding the lead sulfate from mixing in the carbon and affecting the test results, thereby improving the accuracy of the test.

[0025] 2. By heating and stirring the reaction solution, the reaction can be fully carried out to prevent the presence of lead and lead sulfate residues.

[0026] 3. By drying the filter paper and carbon, it is possible to prevent moisture residue on the surface or inside the filter paper and carbon, thereby further improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the preparation method of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Example 1:

[0030] The present invention provides Figure 1 A method for detecting the carbon content in a negative plate of a battery is shown, comprising the following steps:

[0031] A method for detecting carbon content in a negative plate of a battery comprises the following steps:

[0032] S1. Raw material preparation: prepare negative plate sample, nitric acid solution and ammonium acetate;

[0033] S2. Lead removal from raw materials: placing the negative plate sample in an excess of nitric acid solution and heating the mixture to dissolve the lead in the negative plate sample;

[0034] S3. Removal of lead sulfate from raw materials: adding ammonium acetate to the mixture and stirring the mixture thoroughly to dissolve the lead sulfate in the negative plate sample;

[0035] S4. Filtration: Weigh the filter paper, filter out the solid in the mixture using the filter paper, and wash the solid with distilled water to obtain a carbon solid;

[0036] S5, drying: drying the filter paper and carbon;

[0037] S6. Weighing: Weigh the filter paper and carbon, subtract the weight of the filter paper to get the mass of the carbon, and then calculate the carbon content.

[0038] In S1, the negative plate sample is placed in distilled water for cleaning. After ensuring that there is no foreign matter on the surface, the surface of the negative plate sample is wiped dry and then transferred to an oven, heated to 50°C, and dried for 15 minutes. It is taken out after ensuring that there is no moisture residue on the surface. By cleaning and drying the negative plate sample, foreign matter or residual moisture on the surface of the negative plate sample can be prevented from affecting the weighing results. The negative plate sample is cut into small cubes with a side length of about 10 mm using a shearing tool. The cut negative plate sample is weighed and the data is recorded. By cutting the negative plate sample into small cubes, the contact area between the negative plate sample and the nitric acid solution can be effectively increased, thereby increasing the reaction rate, and preventing the lead sulfate on the surface of the negative plate sample from hindering the reaction between the nitric acid solution and the lead inside the negative plate sample, avoiding insufficient reaction, and preventing residual lead from being mixed in the carbon, thereby ensuring the accuracy of the experimental results.

[0039] In S1, the nitric acid concentration in the nitric acid solution is 25%. 25% nitric acid solution is dilute nitric acid. Compared with the reaction of concentrated nitric acid with lead, the reaction of 25% dilute nitric acid with lead is not very violent, which is convenient for controlling the experimental process and is safer. The ammonium acetate concentration is 40%. If the ammonium acetate concentration is too low, it may lead to incomplete dissolution of lead sulfate and cannot reach the dissolution amount required for the experiment. If the ammonium acetate concentration is too high, although it can improve the dissolution effect of lead sulfate, it may bring some negative effects, such as excessive ionic strength in the solution, which may interfere with subsequent experiments. In addition, the cost of an excessively high concentration of ammonium acetate solution is high and there may also be volatilization problems. The ratio of nitric acid solution to negative plate sample is greater than 3:1, which can ensure that the nitric acid solution is excessive, thereby ensuring that the lead in the negative plate sample fully reacts and preventing residual lead from being mixed in the carbon, thereby further ensuring the accuracy of the experimental results.

[0040] In S2, the mixture is transferred to an oven for heating to 50° C. and maintained for 1 hour to allow the lead to fully react with the nitric acid solution to generate lead nitrate that dissolves in water, and the ratio of the nitric acid solution to the negative plate sample is greater than 3:1.

[0041] In S3, ammonium acetate has a certain odor and is volatile, so it needs to be carried out in a well-ventilated environment. Use a stirring device to slowly stir the mixture to avoid splashing the solution. Maintain it for 1 hour to allow the lead sulfate and ammonium acetate to fully react to generate ammonium sulfate and lead acetate and dissolve in water. The mass ratio of ammonium acetate to the negative plate sample is greater than 2:1. The ammonium acetate solution is weakly acidic and will corrode certain metal containers. Therefore, use a glass or plastic container for the operation. The mass ratio of ammonium acetate to the negative plate sample is greater than 2:1 to ensure that the nitric acid solution and ammonium acetate are excessive, thereby ensuring that the lead sulfate in the negative plate sample fully reacts and preventing residual lead sulfate from being mixed in the carbon, thereby further ensuring the accuracy of the experimental results.

[0042] In S4, record the weight data of the filter paper and slowly pour the mixture onto the filter paper to ensure that there is no solid residue in the container holding the mixture, the solution permeates the filter paper, and the solid remains on the filter paper.

[0043] In S4, the filter paper and the solid on the filter paper are moved, and the solid is poured into distilled water for washing. After washing, the distilled water and the solid are poured over the filter paper for filtering, ensuring that no solid remains in the container containing the distilled water.

[0044] In S4, after the solid is poured into distilled water, the distilled water is stirred using a stirring device for 15 minutes, and the washing and filtering are repeated multiple times.

[0045] In S5, the filter paper and the solid on the filter paper are moved into an oven, and the temperature is heated to 80° C. and maintained for 45 minutes to completely evaporate the water remaining on the surface and inside of the filter paper and the solid.

[0046] In S6, the total mass of the filter paper and carbon is weighed and the data is recorded. The mass of the filter paper is subtracted from the total mass of the filter paper and carbon to obtain the mass of the carbon. The carbon content of the negative plate sample can be obtained by dividing the mass of the carbon by the weight of the negative plate sample. By comparing the test results of different negative plate samples, the distribution of carbon in the negative plate can be obtained.

[0047] In S1, operators can sample different locations on the negative plate and test multiple negative plate samples to understand the distribution of carbon in the negative plate. During the production process of battery negative plates, various factors may cause the carbon content to vary at different locations. By sampling and testing at different locations, the distribution of carbon content can be accurately grasped and the overall composition uniformity of the plate can be understood. If the carbon content at different locations varies greatly, it indicates that there may be unstable factors in the production process, such as uneven mixing of raw materials and fluctuations in production equipment parameters. Through regular testing, process problems can be discovered in a timely manner, and corresponding measures can be taken to adjust and optimize them to ensure the stability of product quality.

[0048] In this embodiment, it is found that the carbon content has the following effects:

[0049] By reacting the negative plate sample with nitric acid, the lead in the negative plate sample can be effectively dissolved, and by adding ammonium acetate, the lead sulfate produced by the contact between the negative plate and sulfuric acid can be dissolved, thereby preventing the lead sulfate from mixing in the carbon and affecting the test results, thereby improving the accuracy of the test. By heating and stirring the reaction solution, the reaction can be fully carried out to prevent the presence of lead and lead sulfate residues. By drying the filter paper and carbon, the presence of moisture residue on the surface or inside the filter paper and carbon can be prevented, thereby further improving the accuracy of the test.

[0050] Example 2:

[0051] The present invention provides Figure 1 A method for detecting the carbon content in a negative plate of a battery is shown, comprising the following steps:

[0052] S1. Raw material preparation: prepare negative plate sample, nitric acid solution and ammonium acetate;

[0053] S2. Lead removal from raw materials: placing the negative plate sample in an excess of nitric acid solution and heating the mixture to dissolve the lead in the negative plate sample;

[0054] S3. Removal of lead sulfate from raw materials: adding ammonium acetate to the mixture and stirring the mixture thoroughly to dissolve the lead sulfate in the negative plate sample;

[0055] S4. Filtration: Weigh the filter paper, filter out the solid in the mixture using the filter paper, and wash the solid with distilled water to obtain a carbon solid;

[0056] S5, drying: drying the filter paper and carbon;

[0057] S6. Weighing: Weigh the filter paper and carbon, subtract the weight of the filter paper to get the mass of the carbon, and then calculate the carbon content.

[0058] In S1, the negative plate sample is placed in distilled water for cleaning. After ensuring that there is no foreign matter on the surface, the surface of the negative plate sample is wiped dry and then transferred to an oven, heated to 80°C, and dried for 20 minutes. It is taken out after ensuring that there is no moisture residue on the surface. By cleaning and drying the negative plate sample, foreign matter or residual moisture on the surface of the negative plate sample can be prevented from affecting the weighing results. The negative plate sample is cut into small cubes with a side length of about 5 mm using a shearing tool. The cut negative plate sample is weighed and the data is recorded. By cutting the negative plate sample into small cubes, the contact area between the negative plate sample and the nitric acid solution can be effectively increased, thereby increasing the reaction rate, and preventing the lead sulfate on the surface of the negative plate sample from hindering the reaction between the nitric acid solution and the lead inside the negative plate sample, avoiding insufficient reaction, and preventing residual lead from being mixed in the carbon, thereby ensuring the accuracy of the experimental results.

[0059] In S1, the nitric acid concentration in the nitric acid solution is 25%. 25% nitric acid solution is dilute nitric acid. Compared with the reaction of concentrated nitric acid with lead, the reaction of 25% dilute nitric acid with lead is not very violent, which is convenient for controlling the experimental process and is safer. The ammonium acetate concentration is 40%. If the ammonium acetate concentration is too low, it may lead to incomplete dissolution of lead sulfate and cannot reach the dissolution amount required for the experiment. If the ammonium acetate concentration is too high, although it can improve the dissolution effect of lead sulfate, it may bring some negative effects, such as excessive ionic strength in the solution, which may interfere with subsequent experiments. In addition, the cost of an excessively high concentration of ammonium acetate solution is high and there may also be volatilization problems. The ratio of nitric acid solution to negative plate sample is greater than 3:1, which can ensure that the nitric acid solution is excessive, thereby ensuring that the lead in the negative plate sample fully reacts and preventing residual lead from being mixed in the carbon, thereby further ensuring the accuracy of the experimental results.

[0060] In S2, the mixture is transferred to an oven for heating to 80° C. and maintained for 2 hours to allow the lead to fully react with the nitric acid solution to generate lead nitrate that dissolves in water, and the ratio of the nitric acid solution to the negative plate sample is greater than 3:1.

[0061] In S3, ammonium acetate has a certain odor and is volatile, so it needs to be carried out in a well-ventilated environment. Use a stirring device to slowly stir the mixture to avoid splashing the solution. Maintain it for 1.5 hours to allow the lead sulfate and ammonium acetate to fully react to generate ammonium sulfate and lead acetate and dissolve in water. The mass ratio of ammonium acetate to the negative plate sample is greater than 2:1. The ammonium acetate solution is weakly acidic and will corrode certain metal containers. Therefore, use a glass or plastic container for the operation. The mass ratio of ammonium acetate to the negative plate sample is greater than 2:1 to ensure that the nitric acid solution and ammonium acetate are excessive, thereby ensuring that the lead sulfate in the negative plate sample fully reacts and preventing residual lead sulfate from being mixed in the carbon, thereby further ensuring the accuracy of the experimental results.

[0062] In S4, record the weight data of the filter paper and slowly pour the mixture onto the filter paper to ensure that there is no solid residue in the container holding the mixture, the solution permeates the filter paper, and the solid remains on the filter paper.

[0063] In S4, the filter paper and the solid on the filter paper are moved, and the solid is poured into distilled water for washing. After washing, the distilled water and the solid are poured over the filter paper for filtering, ensuring that no solid remains in the container containing the distilled water.

[0064] In S4, after the solid is poured into distilled water, the distilled water is stirred using a stirring device for 20 minutes, and the washing and filtering are repeated multiple times.

[0065] In S5, the filter paper and the solid on the filter paper are moved into an oven, and the temperature is heated to 50° C. and maintained for 30 minutes to completely evaporate the water remaining on the surface and inside of the filter paper and the solid.

[0066] In S6, the total mass of the filter paper and carbon is weighed and the data is recorded. The mass of the filter paper is subtracted from the total mass of the filter paper and carbon to obtain the mass of the carbon. The carbon content of the negative plate sample can be obtained by dividing the mass of the carbon by the weight of the negative plate sample. By comparing the test results of different negative plate samples, the distribution of carbon in the negative plate can be obtained.

[0067] Among them, in S1, the nitric acid concentration in the nitric acid solution is 25%. Concentrated nitric acid reacts with lead to produce nitrogen dioxide, which is a reddish-brown toxic gas that is harmful to the environment and human health. In contrast, 25% dilute nitric acid reacts with lead to produce nitric oxide. Although nitric oxide is also a toxic gas, it will be quickly oxidized to nitrogen dioxide in the air. However, its production is relatively small, and the pollution to the environment is relatively small. In addition, concentrated nitric acid has strong oxidizing properties and reacts violently with lead. A large amount of heat is released during the reaction, making it difficult to control the reaction rate and easily causing danger. In addition, the consumption of concentrated nitric acid is more than that of dilute nitric acid to dissolve the same amount of lead.

[0068] In this embodiment, it is found that the carbon content has the following effects:

[0069] By using a 25% concentration of nitric acid solution, there is less harm to the environment and human health. Secondly, dilute nitric acid is less corrosive than concentrated nitric acid, causing less damage to experimental equipment and extending the service life of the equipment. In terms of reaction rate, the reaction rate of dilute nitric acid with lead is relatively moderate, making it easy to control the reaction process, while concentrated nitric acid reacts too violently with lead and is difficult to control, which may lead to dangerous situations such as runaway reaction. Finally, in terms of cost, dilute nitric acid has a lower concentration and is cheaper than concentrated nitric acid, which can reduce the cost of experiments or production.

[0070] In general, the present invention has the following advantages:

[0071] By reacting the negative plate sample with nitric acid and ammonium acetate, the lead and lead sulfate in the negative plate sample can be effectively dissolved, making it easier to filter out the carbon in the negative plate sample, thereby improving the accuracy of detection. By heating and stirring the reaction solution, the reaction can be carried out quickly and fully, preventing the presence of lead and lead sulfate residues. By drying the filter paper and carbon, moisture residue can be prevented from remaining on the surface or inside the filter paper and carbon, thereby further improving the accuracy of detection. At the same time, the detection process has less harm to the environment and human health, less damage to experimental equipment, can extend the service life of the equipment, facilitates the control of the reaction process, reduces the probability of dangerous situations, and can reduce the cost of detection.

[0072] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting the carbon content in a negative plate of a battery, characterized in that: The following steps are involved: S1. Raw material preparation: prepare negative plate sample, nitric acid solution and ammonium acetate; S2. Lead removal from raw materials: placing the negative plate sample in an excess of nitric acid solution and heating the mixture to dissolve the lead in the negative plate sample; S3. Removal of lead sulfate from raw materials: adding ammonium acetate to the mixture and stirring the mixture thoroughly to dissolve the lead sulfate in the negative plate sample; S4. Filtration: Weigh the filter paper, filter out the solid in the mixture using the filter paper, and wash the solid with distilled water to obtain a carbon solid; S5, drying: drying the filter paper and carbon; S6. Weighing: Weigh the filter paper and carbon, subtract the weight of the filter paper to get the mass of the carbon, and then calculate the carbon content.

2. The method for detecting the carbon content in a negative plate of a battery according to claim 1, wherein: In S1, the negative plate sample is placed in distilled water for cleaning. After ensuring that there is no foreign matter on the surface, the surface of the negative plate sample is wiped dry and then transferred to an oven, heated to 50°C-80°C, and dried for 15-20 minutes. After ensuring that there is no moisture remaining on the surface, it is taken out and cut into small cubes using a shearing tool. The cut negative plate sample is weighed and the data is recorded.

3. The method for detecting the carbon content in a negative plate of a battery according to claim 1, wherein: In S1, the nitric acid concentration in the nitric acid solution is 25%. The 25% concentration nitric acid solution belongs to dilute nitric acid. Compared with the reaction between concentrated nitric acid and lead, the reaction between the 25% concentration dilute nitric acid and lead is not very violent, which is convenient for controlling the experimental process and is safer. The ammonium acetate concentration is 40%. The 40% concentration of ammonium acetate can completely dissolve the lead sulfate and achieve the dissolution amount required for the experiment, while avoiding the negative effects of excessive ammonium acetate concentration, such as excessive ionic strength in the solution, which may interfere with subsequent experiments. In addition, the cost of an ammonium acetate solution with an excessively high concentration is high and there may also be volatilization problems.

4. The method for detecting the carbon content in a negative plate of a battery according to claim 1, wherein: In S2, the mixture is transferred to an oven for heating to 50° C.-80° C. and maintained for 1-2 hours to allow the lead to fully react with the nitric acid solution to generate lead nitrate which is dissolved in water, and the ratio of the nitric acid solution to the negative plate sample is greater than 3:

1.

5. The method for detecting the carbon content in a negative plate of a battery according to claim 1, wherein: In the step S3, it is necessary to carry out the process in a well-ventilated environment, and slowly stir the mixture using a stirring device to avoid splashing of the solution. The stirring time is 1-1.5 hours, so that the lead sulfate and ammonium acetate react fully to generate ammonium sulfate and lead acetate and dissolve in water, and the mass ratio of ammonium acetate to the negative plate sample is greater than 2:

1.

6. The method for detecting the carbon content in a negative plate of a battery according to claim 1, wherein: In S4, the weight data of the filter paper is recorded, and the mixture is slowly poured onto the filter paper to ensure that no solid remains in the container holding the mixture, the solution permeates the filter paper, and the solid remains on the filter paper.

7. The method for detecting the carbon content in a negative plate of a battery according to claim 6, characterized in that: In S4, the filter paper and the solid on the filter paper are moved, and the solid is poured into distilled water for washing. After washing, the distilled water and the solid are poured over the filter paper for filtering to ensure that no solid remains in the container containing the distilled water.

8. The method for detecting the carbon content in a negative plate of a battery according to claim 7, wherein: In the step S4, after the solid is poured into distilled water, the distilled water is stirred using a stirring device for 15-20 minutes, and the solid is repeatedly washed and filtered.

9. The method for detecting the carbon content in a negative plate of a battery according to claim 8, characterized in that: In S5, the filter paper and the solid on the filter paper are moved into an oven, and the temperature is heated to 50° C.-80° C. and maintained for 30-45 minutes to completely evaporate the water remaining on the surface and inside of the filter paper and the solid.

10. The method for detecting the carbon content in a negative plate of a battery according to claim 1, wherein: In S6, the total mass of the filter paper and the carbon is weighed and recorded. The mass of the carbon is obtained by subtracting the mass of the filter paper from the total mass of the filter paper and the carbon. The carbon content of the negative plate sample can be obtained by dividing the mass of the carbon by the weight of the negative plate sample.

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