Method for improving floating charge performance of zinc-silver reserve battery

Abstract

The invention discloses a method for improving floating charge performance of a zinc-silver reserve battery, belongs to the field of design of the zinc-silver reserve battery, and aims to discharge the capacity of the zinc-silver reserve battery to 70-80% of the capacity of the zinc-silver reserve battery after formation charging in the production process of the zinc-silver reserve battery, and the open-circuit voltage of a single battery is 1.60-1.70 V. The zinc-silver reserve battery is used for connecting a power generation system in parallel. When the positive electrode plate and the negative electrode plate are pre-discharged in the production process and are connected with a power generation system in parallel, the battery can be immediately discharged to work and can also be immediately charged, and the risk of overcharging or overdischarging does not exist. The positive and negative plates can change along with the voltage of the power generation system through pre-electrification, thereby preventing overlarge difference between the voltage of the battery pack and the voltage of the power generation system from causing overlarge charging or discharging current of the battery pack.

Description

Technical Field

[0001] This invention belongs to the field of zinc-silver reserve battery design, and in particular relates to the design of float-charge zinc-silver reserve battery packs. Background Technology

[0002] Zinc-silver backup batteries are widely used in various fields. In recent years, users have requested that the batteries provide power independently before the power generation system of the battery platform is started; after the power generation system is started, the power generation system and the batteries should be connected in parallel to power the equipment on the platform. Due to the unstable voltage of the power generation system, when the power generation system voltage is higher than the battery voltage, the battery is in a charging state. When the power generation system voltage is lower than the battery voltage, the battery is in a discharging state, and the battery as a whole is in a float charging state. Because a typical zinc-silver battery charging curve has two relatively stable plateau voltages, it is difficult to quickly adapt to the real-time changes in the fluctuating voltage of the power generation system. This results in a large voltage difference between the battery pack and the power generation system, which can easily cause the battery pack to be charged or discharged with high current, thus affecting battery performance. Summary of the Invention

[0003] This invention meets the float charging performance requirements of zinc-silver reserve batteries by adopting design voltage matching technology and battery rechargeable capacity matching design technology.

[0004] The technical solution of the present invention is as follows: A method for improving the float charging performance of zinc-silver reserve batteries, wherein after the formation charging process of zinc-silver reserve batteries, their capacity is discharged to 70% to 80% of their capacity, and the open circuit voltage of a single cell is 1.60V to 1.70V.

[0005] Furthermore, the zinc-silver backup battery is used in a parallel power generation system.

[0006] The advantages and positive effects of this invention are: 1. The positive and negative plates are pre-discharged during the production process. When connected in parallel with the power generation system, the battery can be discharged and charged immediately without the risk of overcharging or over-discharging.

[0007] 2. The positive and negative plates are designed to prevent voltage fluctuations from following changes in the power generation system voltage, thus avoiding excessive voltage difference between the battery pack and the power generation system, which could cause excessive charging or discharging current in the battery pack. Attached Figure Description

[0008] Figure 1 This is the parallel discharge curve of a single cell prepared by the method of this invention. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0010] The present invention provides a method for improving the float charging performance of zinc-silver reserve batteries. After the zinc-silver reserve battery is formed and charged during the production process, its capacity is discharged to 70% to 80% of its capacity, and the open-circuit voltage of a single cell is 1.60V to 1.70V.

[0011] The zinc-silver backup battery is used in a parallel power generation system.

[0012] Specifically, zinc-silver batteries exhibit two relatively stable plateau voltages during charging. Without this treatment, when operating in parallel with a power generation system, the battery voltage is difficult to match, resulting in a large voltage difference between the battery and the system, leading to high-current charging or discharging of the battery. Using the method of this invention, after the battery's formation charging during production, its capacity is discharged to 70%–80%, with a single cell open-circuit voltage of 1.60V–1.70V. At this point, when the zinc-silver battery pack is connected in parallel with the power generation system, regardless of whether the battery is charging or discharging, the battery voltage can quickly and effectively match the fluctuating power generation system voltage, avoiding high-current charging or discharging of the battery pack. Zinc-silver reserve batteries without the above technical measures, when connected in parallel with a power generation system, will experience an excessively large voltage difference between the battery and the system, causing high-current charging of the battery or prolonged high-current output from the battery.

[0013] Example 1 1. After the battery is formed and charged during the battery production process, discharge it to 70% of its capacity.

[0014] 2. The open-circuit voltage of a single cell is 1.60V.

[0015] Float charging tests were conducted using individual cells, and the float charging was as follows: Figure 1 As shown, the parallel voltage is 1.63V / cell, corresponding to a combined voltage of 30.97V. The figure shows that under this parallel voltage, the initial charging current of a single cell reaches 5A, decreasing over time until it approaches 0A around 6500s. In the figure, 11# represents the voltage of the test cell, 12# represents the voltage of the test cell, and Current represents the battery charging / discharging current.

[0016] Although preferred embodiments of the present invention have been described above, the invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of the present invention, can make many other modifications without departing from the spirit and scope of the claims. These modifications all fall within the scope of protection of the present invention.

Claims

1. A method of improving the float charge performance of a zinc-silver reserve battery, characterized by, After formation charging in the production process of the zinc-silver reserve battery, the capacity is discharged to 70% to 80% of the capacity, and the open circuit voltage of the single battery is 1.60V to 1.70V.

2. The method of claim 1, wherein the zinc-silver reserve battery is a zinc-silver oxide battery. The zinc-silver reserve battery is used in a parallel power generation system.

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