A high pulse zinc-silver storage battery

Abstract

The invention discloses a high-pulse zinc-silver reserve battery, belonging to the technical field of zinc-silver reserve batteries. The battery comprises a gas generator, a liquid reservoir, a positive plate, a negative plate, and a separator. The invention is characterized in that: the positive plate is prepared by firstly pressing silver powder with a high specific surface area onto a silver wire skeleton by a rolling process, the thickness of the positive plate being 0.21 mm to 0.24 mm, then performing formation charging by a rich liquid single formation process, the charging capacity being 120% to 130% of the theoretical capacity of the plate, and finally performing a post-formation pre-discharge treatment, the pre-discharge capacity being 20% ​​to 30% of the theoretical capacity; the negative plate is prepared by firstly pressing electrolytic zinc powder with a high specific surface area onto a silver wire skeleton, and performing formation by a single formation process, the thickness of the negative plate after formation being 0.43 mm to 0.48 mm; the separator is a high-pulse zinc-silver reserve battery, the thickness of the negative plate after formation being 0.43 mm to 0.48 mm, the area resistance of the separator is not more than 0.10 Ω·cm 2 triacetyl cellulose membrane.

Description

Technical Field

[0001] The invention belongs to the technical field of zinc-silver storage batteries, and in particular relates to a high-pulse zinc-silver storage battery. Background Art

[0002] Zinc-silver backup batteries are widely used in various fields, particularly in equipment and instruments requiring high voltage accuracy, due to their unique advantages, such as stable discharge voltage, high voltage accuracy, reliability, and safety. In recent years, technological advancements in application platforms have necessitated the addition of pulse currents several times, or even dozens of times, higher than the steady current to the zinc-silver backup battery. These high pulse currents can increase internal polarization in the battery, causing a sharp drop in operating voltage, even below specified requirements. Figure 1 This is the operating current requirement curve of a certain type of product. The operating voltage requirement range of this product is 28.5V±3V. Figure 1 It can be seen that the maximum pulse current of the product is 51A, which is 51 times its constant current 1A discharge. Summary of the Invention

[0003] In response to the above technical deficiencies, the present invention provides a high-pulse zinc-silver reserve battery, which reduces the internal polarization of the battery so that the battery can meet the operating voltage accuracy requirements under high pulse conditions.

[0004] To achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0005] A high pulse zinc-silver reserve battery, consisting of a gas generator, a liquid reservoir, a positive plate, a negative plate, and a diaphragm; wherein:

[0006] The preparation process of the positive plate is as follows: first, a high-surface-area silver powder is pressed onto a silver wire skeleton by a rolling process, and the thickness of the positive plate is 0.21 mm to 0.24 mm. Then, a rich liquid single formation process is used for formation charging, and the charge capacity is 120% to 130% of the theoretical capacity of the plate. Finally, a post-formation pre-discharge treatment is performed, and the pre-discharge capacity is 20% to 30% of its theoretical capacity.

[0007] The negative plate is prepared by pressing electrolytic zinc powder with a high specific surface area onto a silver wire skeleton and forming the negative plate using a single forming process. The thickness of the negative plate after forming is 0.43 mm to 0.48 mm.

[0008] The diaphragm has an area resistance of no more than 0.10Ω·cm 2 triacetyl cellulose membrane.

[0009] Preferably, the thickness of the positive electrode plate is 0.21 mm, 0.24 mm, or 0.22 mm, and the number of positive electrode plates in a single cell is 12.

[0010] Preferably, the thickness of the negative electrode plate is 0.43 mm, and the number of negative electrode plates in a single cell is 12.

[0011] Preferably, the positive plate has a charge capacity of 120% of its theoretical capacity, and a pre-discharge capacity of 20% of its theoretical capacity.

[0012] Preferably, the negative electrode plate is an electrolytic zinc electrode plate with a thickness of 0.43 mm or 0.48 mm.

[0013] Preferably: the area resistance of the diaphragm is 0.06Ω·cm 2 triacetyl cellulose membrane.

[0014] The advantages and technical effects of the present invention are:

[0015] 1. The positive and negative plates adopt ultra-thin thickness parameters, which can increase the number of positive and negative plates in a single cell and reduce internal polarization under pulse current.

[0016] 2. The positive plate adopts a rich liquid single formation process to increase its high-valent silver content after formation.

[0017] 3. The positive plate adopts pre-discharge process to reduce the internal resistance of the positive plate.

[0018] 4. The negative plate is made of electrolytic zinc powder with high specific surface area pressed on a silver wire skeleton and formed using a single formation process. No pre-discharge is performed after formation.

[0019] 5. The diaphragm is a triacetyl cellulose membrane with low internal resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The operating current requirement curve for a certain type of product;

[0021] Figure 2 The first battery discharge curve of the preferred embodiment of the present invention is shown;

[0022] Figure 3 A discharge curve of a second battery using a preferred embodiment of the present invention;

[0023] Figure 4 This is a discharge curve of a battery that does not adopt the preferred embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purpose, design control system and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] See also Figures 1 to 4, a high pulse zinc-silver reserve battery, comprising a gas generator, a liquid reservoir, a positive plate, a negative plate, and a separator; wherein:

[0026] The positive plate is made of silver powder with a high specific surface area and is pressed onto a silver wire skeleton using a rolling process. The thickness is 0.21mm to 0.24mm. Then, a rich liquid single formation process is used for formation charging. The charging capacity is 120% to 130% of the theoretical capacity of the plate. Then, a post-formation pre-discharge treatment is performed. The pre-discharge capacity is 20% to 30% of its theoretical capacity, so as to reduce the internal resistance of the positive plate and enable it to have the ability of high pulse discharge.

[0027] The negative plate is made of electrolytic zinc powder with a high specific surface area pressed on a silver wire skeleton and is formed using a single formation process. The thickness of the negative plate after formation is 0.43mm to 0.48mm. For example, the thickness of the negative plate after formation is 0.43mm or 0.48mm, and high pulse discharge capability is met without pre-discharge.

[0028] The diaphragm has an area resistance of no more than 0.10Ω·cm 2 triacetyl cellulose membrane.

[0029] For zinc-silver storage batteries that do not adopt the above technical measures, the high-pulse working voltage will be significantly reduced, even lower than the index requirements. After adopting the above measures, although the pulse working voltage will be lower than that under steady-current conditions, it can meet the index requirements.

[0030] Example 1:

[0031] 1. The thickness of the positive plate is 0.22mm, and the number of positive plates in a single cell is 12; the thickness of the negative plate is 0.43mm, and the number of negative plates in a single cell is 12.

[0032] 2. The positive plate's charge capacity is 120% of its theoretical capacity, and its pre-discharge capacity is 20% of its theoretical capacity.

[0033] 3. The negative plate is an electrolytic zinc plate with a thickness of 0.43 mm.

[0034] 4. The diaphragm used has an area resistance of 0.06Ω·cm 2 triacetyl cellulose membrane.

[0035] The discharge performance of the battery prepared by the above invention method is as follows Figure 2 、 Figure 3 shown.

[0036] The discharge performance of the battery not prepared according to the above invention method is as follows Figure 4 shown.

[0037] from Figure 1 、 Figure 2 、 Figure 3It can be seen that the battery prepared by the present invention has a smaller internal resistance and a significantly improved pulse voltage, and during a complete discharge cycle, the voltage is more stable and the voltage fluctuation is small.

[0038] Example 2:

[0039] 1. The thickness of the positive plate is 0.21mm or 0.24mm, and the number of positive plates in a single cell is 12; the thickness of the negative plate is 0.48mm, and the number of negative plates in a single cell is 12.

[0040] 2. The positive plate's charge capacity is 130% of its theoretical capacity, and its pre-discharge capacity is 30% of its theoretical capacity.

[0041] 3. The negative plate is an electrolytic zinc plate with a thickness of 0.48 mm.

[0042] 4. The diaphragm used has an area resistance of 0.06Ω·cm 2 triacetyl cellulose membrane.

[0043] The discharge performance of the battery prepared by the above invention method is as follows Figure 2 、 Figure 3 shown.

[0044] The discharge performance of the battery not prepared according to the above invention method is as follows Figure 4 shown.

[0045] from Figure 1 、 Figure 2 、 Figure 3 It can be seen that the battery prepared by the present invention has a smaller internal resistance and a significantly improved pulse voltage, and during a complete discharge cycle, the voltage is more stable and the voltage fluctuation is small.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements 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 high pulse zinc-silver reserve battery comprising a gas generator, a liquid reservoir, a positive plate, a negative plate, and a separator; characterized in that: The preparation process of the positive plate is as follows: first, a high-surface-area silver powder is pressed onto a silver wire skeleton by a rolling process, and the thickness of the positive plate is 0.21 mm to 0.24 mm. Then, a rich liquid single formation process is used for formation charging, and the charge capacity is 120% to 130% of the theoretical capacity of the plate. Finally, a post-formation pre-discharge treatment is performed, and the pre-discharge capacity is 20% to 30% of its theoretical capacity. The negative plate is prepared by pressing electrolytic zinc powder with a high specific surface area onto a silver wire skeleton and forming the negative plate using a single forming process. The thickness of the negative plate after forming is 0.43 mm to 0.48 mm. The diaphragm has an area resistance of no more than 0.10Ω·cm 2 triacetyl cellulose membrane.

2. The high pulse zinc-silver reserve battery according to claim 1, characterized in that: The thickness of the positive electrode plate is 0.21 mm, 0.24 mm, or 0.22 mm, and the number of positive electrode plates in a single cell is 12.

3. The high pulse zinc-silver reserve battery according to claim 1, characterized in that: The thickness of the negative plate is 0.43 mm, and there are 12 negative plates in a single cell.

4. The high pulse zinc-silver reserve battery according to claim 1, characterized in that: The positive plate has a charge capacity of 120% of its theoretical capacity and a pre-discharge capacity of 20% of its theoretical capacity.

5. The high pulse zinc-silver reserve battery according to claim 1, characterized in that: The negative electrode plate is an electrolytic zinc plate with a thickness of 0.43 mm or 0.48 mm.

6. The high pulse zinc-silver reserve battery according to claim 1, characterized in that: The area resistance of the diaphragm is 0.06Ω·cm 2 triacetyl cellulose membrane.

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