Button cell bitter agent and coating method thereof

Abstract

The invention discloses a button cell bitter agent and a coating method thereof, and relates to the technical field of button cells. The button cell bitter agent comprises the following components in parts by weight: water, denatonium benzoate, sodium chloride and an adhesive. According to the button cell bitterness agent and the coating method, a highly effective protective layer with strong bitterness can be formed, and the whole surface of the button cell is uniformly coated without influencing the electrical property of the cell.

Description

Technical Field

[0001] The present invention relates to the field of button batteries, and particularly to a bittering agent for button batteries and a coating method thereof. Background Art

[0002] As a common power source for small portable electronic devices such as remote controls, calculators, hearing aids, etc., the safety and environmental protection of button batteries have been increasingly widely emphasized in modern society. Especially for the risk that children may accidentally ingest button batteries out of curiosity, traditional methods such as placing them at a high place or using packaging protection are often difficult to comprehensively and effectively prevent such accidents. The accidental ingestion of button batteries by children may cause serious injuries or even death, so it is crucial to take effective anti-ingestion measures.

[0003] Coating a bittering agent on the surface of button batteries can enhance the protection. The bittering agents on the market include capsaicin, caffeine, sucrose octaacetate, neohesperidin dihydrochalcone (NHDC), denatonium benzoate, etc. However, when the commonly used bittering agents are set on button batteries, they will affect the electrical performance of the batteries. Summary of the Invention

[0004] The present invention is made in view of the above problems, and provides a bittering agent for button batteries and a coating method thereof.

[0005] The first aspect of the present invention provides a bittering agent for button batteries, which includes water, denatonium benzoate, sodium chloride and a binder.

[0006] In some embodiments of the present invention, the bittering agent for button batteries, by weight, includes: 0.1 part to 0.3 part of denatonium benzoate, 0.5 to 1.5 parts of sodium chloride, 0.01 to 0.02 part of binder and 95 to 98 parts of deionized water.

[0007] In some embodiments of the present invention, the bittering agent for button batteries, by weight, includes: 0.2 part of denatonium benzoate, 1 part of sodium chloride, 0.01 part of binder and 97 parts of deionized water.

[0008] In some embodiments of the present invention, the binder includes polyacrylic acid.

[0009] The second aspect of the present invention provides a bittering agent for button batteries and a coating method thereof, including the following steps:

[0010] Pre-treat the button batteries;

[0011] Mix water, denatonium benzoate, sodium chloride and the binder in proportion to obtain a bittering agent for button batteries;

[0012] Place the pre - treated button battery on the track and transport it uniformly to soak in the solution containing bittering agent, then dry and solidify it to obtain a button battery coated with bittering agent.

[0013] In some embodiments of the present invention, the uniform speed is 1 cm / s to 1.5 cm / s.

[0014] In some embodiments of the present invention, the soaking includes: placing the pre - treated button battery on the track and transporting it uniformly to soak in the solution containing bittering agent for the first time, turning the button battery over, then placing it on the track again and transporting it uniformly to soak in the solution containing bittering agent for the second time.

[0015] In some embodiments of the present invention, the duration of the first soaking is 1 min to 2 min.

[0016] In some embodiments of the present invention, the duration of the second soaking is 1 min to 2 min.

[0017] The beneficial effects that the present invention can achieve:

[0018] The present invention provides a bittering agent for button batteries. Denatonium benzoate can produce a strong bitter taste, and its bittering effect far exceeds that of other common bitter substances. Sodium chloride can adjust the osmotic pressure of the solution, assist in conducting electricity, and help maintain the stability of the internal environment of the battery; the binder uniformly fixes components such as denatonium benzoate and sodium chloride on the battery surface to form a stable coating, ensuring that these components will not fall off easily during normal use, and will only release the bitter taste when the battery is wetted (such as being wetted by saliva). This bittering coating can be uniformly coated on the entire surface of the button battery without affecting the electrical performance of the battery, and can also protect the battery to a certain extent, prevent the battery surface from being scratched or damaged physically, and extend the service life of the battery. Detailed implementation manners

[0019] The following description is provided to enable those skilled in the art to fully understand the present invention and is not intended to limit the subject matter recited in the claims.

[0020] The "range" disclosed in the present invention is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The ranges defined in this way can include or exclude the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present invention, unless otherwise stated, the numerical range "a-b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been fully listed herein, and "0-5" is only an abbreviated representation of these numerical combinations. In addition, when stating that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0021] If there is no special description, all embodiments and optional embodiments of the present invention can be combined with each other to form a new technical solution.

[0022] If there is no special description, all technical features and optional technical features of the present invention can be combined with each other to form a new technical solution.

[0023] If there is no special description, all steps of the present invention can be carried out in sequence or randomly, preferably in sequence. For example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or can also include steps (b) and (a) carried out in sequence. For example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b), and (c), or can also include steps (a), (c), and (b), or can also include steps (c), (a), and (b), etc.

[0024] As a common power source for small portable electronic devices such as remote controls, calculators, hearing aids, etc., the safety and environmental protection of button batteries have been increasingly widely emphasized in modern society. Especially for the risk that children may accidentally swallow button batteries out of curiosity, traditional methods such as placing them at a high place or using packaging protection, etc., often cannot comprehensively and effectively prevent such accidents from occurring. If a button battery is accidentally swallowed by a child, it may cause serious injuries or even death. Therefore, taking effective anti-swallowing measures is crucial.

[0025] Coating a bittering agent on the surface of a button battery can enhance the protection. Common bittering agents on the market include capsaicin, caffeine, sucrose octaacetate, neohesperidin dihydrochalcone (NHDC), denatonium benzoate, etc. However, when the commonly used bittering agents are set on button batteries, they will affect the electrical performance of the batteries.

[0026] In view of this, this solution proposes a bittering agent for button batteries. The bittering agent for button batteries includes water, denatonium benzoate, sodium chloride and a binder.

[0027] Denatonium benzoate has an extremely strong bitterness, which is 1000 times that of ordinary bittering agents. Only a small amount is needed to prepare the bittering agent. Denatonium benzoate is green, environmentally friendly, non-toxic and low-cost, and has stable performance. It can be used in low-temperature and high-temperature scenarios, covering the application scenarios of button batteries. Sodium chloride can adjust the osmotic pressure of the solution, assist in conduction, and help maintain the stability of the internal environment of the battery. The binder evenly fixes components such as denatonium benzoate and sodium chloride on the battery surface, forming a stable coating to ensure that these components will not easily fall off during normal use, and will only release bitterness when the battery is wetted (such as wetted by saliva). This bitter coating can be evenly coated on the entire surface of the button battery without affecting the electrical performance of the battery, and can also protect the battery to a certain extent, prevent the battery surface from being scratched or damaged physically, and extend the service life of the battery.

[0028] In some embodiments, the bittering agent for button batteries, by weight, includes: 0.1 part to 0.3 part of denatonium benzoate, 0.5 to 1.5 parts of sodium chloride, 0.01 to 0.02 part of binder, and 95 to 98 parts of deionized water. In the above bittering agent system, when the weight fraction of denatonium benzoate is less than 0.1 part, the bitterness is not obvious, which is not sufficient to achieve a warning effect and the concentration is too low to effectively adhere to the battery surface; while when the weight fraction is greater than 0.3 part, the concentration is too high, resulting in a white powder mixture containing denatonium benzoate precipitating after drying, thus affecting the normal use of the battery.

[0029] In some embodiments, the bittering agent for button batteries, by weight, includes: 0.2 part of denatonium benzoate, 1 part of sodium chloride, 0.01 part of binder, and 97 parts of deionized water. The use of 0.01 part of binder and sodium chloride in combination can allow electrons to pass through the coating film, thus not causing insulation and affecting the normal use of the battery.

[0030] In some embodiments, the adhesive includes polyacrylic acid. Polyacrylic acid (PAA) is a water-soluble polymer and is commonly used in the production of chain-shaped polymer aqueous binders. Polar groups such as sodium carboxylate in PAA contribute to the transport of ions, reduce the internal resistance of the coating layer, improve the rate performance, improve the overall cycle efficiency, and PAA contains a relatively high proportion of strong polar groups such as sodium carboxylate, resulting in better adhesion effect and ensuring the stability of the battery during use. As an aqueous binder, PAA also has environmental protection characteristics and will not cause pollution to the environment.

[0031] The second aspect of the present invention provides a method for coating a bittering agent on a button battery, comprising the following steps:

[0032] Pretreat the button battery;

[0033] Mix water, denatonium benzoate, sodium chloride and an adhesive in proportion to obtain a bittering agent for button batteries;

[0034] Place the pretreated button battery on a track and transport it uniformly to be soaked in a solution containing the bittering agent, and then dry and cure it to obtain a button battery coated with the bittering agent.

[0035] Conventional coating methods for bittering agents include spraying method, brushing method, electrophoretic painting method, etc. However, the above methods have very strict conditions. For example, the spraying method is suitable for large-area, rapid and uniform coating, but it may be necessary to precisely control the spraying distance, speed and coating flow rate to ensure the coating quality. Obviously, it is not applicable to small button batteries. The immersion coating method used in this solution can process the battery uniformly and rapidly in all aspects, effectively reducing costs and improving production efficiency.

[0036] After obtaining the button battery coated with the bittering agent, quality inspection is also carried out on the coated battery to check whether the coating is uniform, without missed coating, bubbles, cracks and other defects. Through random inspection, chromatography in chemical analysis is used to test the uniformity of the bittering agent coating, and visual inspection is carried out through a ccd detector for screening. In addition, performance testing is carried out on the coated and inspected batteries. The coated batteries will undergo preventive electricity, internal resistance, voltage and current testing to ensure that each battery meets the shipping standards before shipping, ensuring the yield rate of the finished batteries.

[0037] In some embodiments, the uniform speed is 1 cm / s to 1.5 cm / s. At this speed, sufficient soaking and treatment can be ensured.

[0038] In some embodiments, the soaking includes: transporting the pretreated button battery onto an orbit at a uniform speed and soaking it in a solution containing a bittering agent for the first time. Then, turn the button battery over, place it on the orbit again, and transport it at a uniform speed to soak it in the solution containing the bittering agent for the second time. By treating both sides, the bittering agent can be evenly attached to the battery surface.

[0039] In some embodiments, the duration of the first soaking is 1 min to 2 min. At this soaking time, it can ensure that the front side of the button battery is fully soaked and treated.

[0040] In some embodiments, the duration of the second soaking is 1 min to 2 min. The back side of the button battery is fully soaked and treated.

[0041] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and are not used to limit the present invention.

[0042] Example 1

[0043] Clean a batch of steel shell button battery casings. Soak the batteries in a sink containing dishwashing liquid at room temperature for 1 minute, then brush them with a brush to remove surface oil stains and impurities, enhance the adhesion of the coating, and finally air-dry the battery surface through a clear water rinsing and air-drying process to obtain the pretreated batteries;

[0044] Mix 0.2 parts of denatonium benzoate, 1 part of sodium chloride, 0.01 part of binder, and 97 parts of deionized water by weight to prepare a button battery bittering agent;

[0045] Place the pretreated batteries on an orbit and transport them at a uniform speed of 1 cm / s and immerse them in the solution containing the bittering agent for 1 min. Then, turn the batteries over and immerse them in the solution containing the bittering agent again through the orbit at a uniform speed of 1 cm / s for 1 min, so that the bittering agent is evenly attached to the battery surface;

[0046] Place the coated batteries in a ventilated and dry place for natural drying or heat drying to obtain a batch of steel shell button batteries coated with a bittering agent.

[0047] Example 2

[0048] Clean a batch of nickel-plated button battery casings. Soak the batteries in a sink containing dishwashing liquid at room temperature for 1 minute, then brush them with a brush to remove surface oil stains and impurities, enhance the adhesion of the coating, and finally air-dry the battery surface through a clear water rinsing and air-drying process to obtain the pretreated batteries;

[0049] Mix 0.2 parts of denatonium benzoate, 1 part of sodium chloride, 0.01 part of binder and 97 parts of deionized water by weight to prepare a button battery bittering agent;

[0050] Place the pretreated battery on the track and transport it at a uniform speed of 1 cm / s, then immerse it in the solution containing the bittering agent for 1 minute. Then turn the battery over and immerse it in the solution containing the bittering agent again at a uniform speed of 1 cm / s on the track for 1 minute, so that the bittering agent adheres evenly to the battery surface;

[0051] Place the coated battery in a ventilated and dry place for natural drying or heat drying to obtain a batch of nickel-plated button batteries coated with the bittering agent.

[0052] Comparative Example 1

[0053] Steel shell button battery without coating of bittering agent.

[0054] Comparative Example 2

[0055] Nickel-plated button battery without coating of bittering agent.

[0056] Performance test:

[0057] Measure the electrical performance data of the button batteries coated with the bittering agent obtained in the examples and the original button batteries in the comparative examples, and record the results in the following table:

[0058] Table 1: 1KΩ constant resistance discharge data before 20-day high-temperature storage at 60°C

[0059]

[0060]

[0061] Table 2: 1KΩ constant resistance discharge data after 20-day high-temperature storage at 60°C

[0062]

[0063]

[0064] Table 3: Gradient discharge data before 20-day high-temperature storage at 60°C

[0065] Serial number Example 1 Comparative Example 1 Example 2 Comparative Example 2 1 252.07 251.09 253.73 256.15 2 258.51 256.29 256.19 257.29 3 253.7 254.74 256.5 254.13 4 256.08 255.91 251.20 254.52 Average value / mAh 255.09 254.51 254.41 255.52

[0066] Table 4: Gradient discharge data after 20-day high-temperature storage at 60°C

[0067]

[0068] Table 5: High-temperature storage data

[0069]

[0070]

[0071] As can be seen from the results in Table 1, for each embodiment of the present invention, through the rapid discharge test with a load of 1 kΩ, regardless of whether it is a steel shell or a nickel-plated steel shell, the battery discharge results of the coated bittering agent all reach the standard of more than 90 hours, and all pass the 1k rapid discharge test.

[0072] As can be seen from the results in Table 2, the discharge time of the batteries coated with bittering agent in each embodiment of the present invention all reach 90 h, exceeding the discharge time of 89 h of the batteries in the control group without the coated bittering agent, and pass the rapid discharge test after high temperature.

[0073] As can be seen from the results in Table 3, the discharge capacities of the batteries with and without the coated bittering agent are very close, and the battery performance of the coated bittering agent is not affected by the bittering agent coating layer.

[0074] As can be seen from the results in Table 4, after high temperature, whether the batteries are coated with bittering agent or not, there is a slight attenuation, but the overall capacity is 240 mAh, and the overall capacities are close. The batteries coated with bittering agent pass the gradient discharge test after high temperature.

[0075] As can be seen from the results in Table 5, before high temperature, the internal resistance of the battery in Example 1 is the smallest and the current is the highest, and after high temperature, the internal resistance is also the smallest, and the increase in internal resistance is the smallest, which is superior to the comparative example. The other performances are close to those of the batteries without the coated bittering agent, and it passes the high temperature storage test.

[0076] Based on the above results, it is confirmed that the bittering agent for button batteries and its coating method of the present solution can uniformly coat the bittering agent on the entire surface of the button battery without causing a decline in battery performance. Using denatonium benzoate as the raw material for our bittering agent, denatonium benzoate has high stability, is relatively safe, non-toxic, green and environmentally friendly. By using it together with a binder and a sodium chloride solution, it can be evenly attached to the battery surface. And this coating process is green and environmentally friendly, and the materials used are harmless to the environment and the human body, and can be mass-produced and processed at low cost, greatly reducing the manufacturing cost. The batteries coated by this process not only do not decay in performance, but to a certain extent, the bittering agent coating also forms a protective film, extending the service life of the battery.

[0077] It should be noted that the present invention is not limited to the above embodiments. The above embodiments are only examples, and embodiments with the same composition and the same effect as the technical idea within the technical scope of the present invention are all included in the technical scope of the present invention. In addition, within the scope not departing from the gist of the present invention, various deformations that can be thought of by those skilled in the art are applied to the embodiments, and other ways constructed by combining some constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A button battery bittering agent, characterized in that: The button cell bittering agent includes water, denatonium benzoate, sodium chloride and a binder.

2. The button cell bittering agent according to claim 1, characterized in that: The button battery bittering agent comprises, by weight, 0.1 to 0.3 parts of denatonium benzoate, 0.5 to 1.5 parts of sodium chloride, 0.01 to 0.02 parts of a binder and 95 to 98 parts of deionized water.

3. The button cell bittering agent according to claim 1, characterized in that: The button battery bittering agent comprises, by weight, 0.2 parts of denatonium benzoate, 1 part of sodium chloride, 0.01 parts of adhesive and 97 parts of deionized water.

4. The button cell bittering agent according to claim 1, characterized in that: The binder includes polyacrylic acid.

5. A method for coating a button cell bittering agent according to any one of claims 1 to 4, characterized in that: The following steps are involved: Pre-treat button batteries; Mix water, denatonium benzoate, sodium chloride and a binder in proportion to obtain a button battery bittering agent; The pretreated button battery is placed on a track and transported at a uniform speed to a solution containing a bittering agent for immersion, drying and solidification to obtain a button battery coated with a bittering agent.

6. The method for coating a bittering agent for a button cell according to claim 5, characterized in that: The uniform speed is 1 cm / s to 1.5 cm / s.

7. The method for coating a bittering agent for a button cell according to claim 5, characterized in that: The soaking comprises: placing the pretreated button battery on a track and transporting it at a uniform speed to a solution containing a bittering agent for a first soaking, turning the button battery over, placing it on the track again, and transporting it at a uniform speed to a solution containing a bittering agent for a second soaking.

8. The method for coating a bittering agent for a button cell according to claim 7, characterized in that: The duration of the first soaking is 1 min to 2 min.

9. The method for coating a bittering agent for a button cell according to claim 7, characterized in that: The second soaking time is 1 to 2 minutes.

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