Method for prolonging parking time of flooded parking type storage battery

Abstract

The invention provides a method for prolonging parking time of a flooded parking type storage battery. The method comprises the following steps: S1, adjusting the liquid level of an acid electrolyte in the flooded storage battery after formation or capacity fading to a safe liquid level height; s2, adding an electrolyte additive into the acid electrolyte to obtain a composite electrolyte, and standing for 2-3 days; s3, charging after standing is finished, so that the electrolyte additive and the acid electrolyte are fully and uniformly mixed; the electrolyte additive comprises the following components: 35-45 wt% of colloidal silicon dioxide, 0.1-0.3 wt% of a defoaming agent and the balance of water. The electrolyte layering of the flooded parking storage battery in a low-voltage deep-cycle working mode is inhibited through a method of adding SiO2 colloid later, so that the battery capacity is maintained at a high capacity platform, and the parking time is prolonged; and the method can also be used as a method for repairing the battery with attenuated capacity, so that the capacity of the parking storage battery recovers benign operation.

Description

Technical Field

[0001] The invention relates to a method for improving the parking time of a flooded parking type storage battery, belonging to the technical field of storage batteries. Background Art

[0002] In recent years, with the improvement of people's living standards, heavy truck parking air conditioners have begun to rise and quickly become popular. Parking type batteries are used as starting power sources for heavy trucks and power sources for electrical equipment such as parking air conditioners. The usage mode is mostly deep cycle discharge. At present, due to the high prices of AGM batteries and lithium batteries, the market share is relatively small. The price advantage of flooded parking type batteries makes them still dominate the market.

[0003] Heavy trucks use the same charging system as commercial vehicles, with a single battery charged at 14.0V. Flooded parking batteries will cause electrolyte stratification and rapid capacity decay under low-voltage deep-cycle working mode, causing customer complaints and even returns due to short parking time.

[0004] For a long time, the application of electrolyte addition colloid in AGM battery is relatively early and relatively common. AGM battery is also called starved battery, that is, the electrolyte of the battery is adsorbed in the AGM separator and plate. SiO2 colloid needs to be mixed with the electrolyte before the battery is filled with acid and then injected into the battery. After the battery is formed, it forms a gel evenly distributed in the AGM separator, which inhibits the stratification of the electrolyte during deep discharge operation of the battery to increase the cycle life of the battery. The charging system of commercial vehicles only has a single 14.0V charger to meet the charging needs of AGM batteries.

[0005] However, flooded parking batteries are different from AGM batteries. There is free sulfuric acid electrolyte in the battery, and the heavy-duty commercial vehicle charging system uses a single battery with 14.0V charging. The flooded parking battery cannot be fully charged at 14.0V in the low-voltage deep cycle working mode (the fully charged charging voltage of the flooded lead-acid battery should be 15.2V-16.0V). Therefore, the flooded parking battery will have electrolyte stratification when operating in this working mode, which will aggravate the battery undercharging and cause the battery capacity to decay quickly.

[0006] Therefore, how to provide a method for improving the parking time of a flooded parking type battery is a technical problem that those skilled in the art need to solve urgently. Summary of the invention

[0007] In view of the above problems, the present invention proposes a method for improving the deep cycle life of a flooded parking battery. By post-adding SiO2 colloid, electrolyte stratification of the flooded parking battery in a low-voltage deep cycle working mode is suppressed, so that the battery capacity is maintained at a high capacity platform, thereby extending the parking time. It can also be used as a method for repairing a battery whose capacity has decayed, so as to restore the parking battery capacity to normal operation.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A method for increasing the parking time of a flooded parking battery comprises the following steps:

[0010] S1: Adjust the acid electrolyte level in the flooded battery after formation or capacity decay to a safe level;

[0011] S2: adding the electrolyte additive to the acid electrolyte to obtain a composite electrolyte, and leaving it to stand for 2 to 3 days;

[0012] S3: charging after standing still to make the electrolyte additive and the acid electrolyte fully mixed;

[0013] The electrolyte additive components are: 35-45wt% of colloidal silicon dioxide, 0.1-0.3wt% of defoaming agent, and the rest is water.

[0014] Beneficial effects of the above technical solution: The electrolyte additive used in the present invention is a mixture of nano-silicon dioxide, defoaming agent and water. Silica gel thickens the sulfuric acid electrolyte, delays the stratification of the electrolyte, makes full use of the active substances on the upper and lower parts of the plate, and delays the capacity decay; colloidal silica reacts with organic substances such as the wetting agent of the PE separator of the flooded battery to produce bubbles, and the defoaming agent can eliminate the side effect of the generation of bubbles.

[0015] Preferably, the electrolyte additive components are: 39-41 wt % of colloidal silicon dioxide, 0.1-0.3 wt % of defoaming agent, and the rest is water.

[0016] Preferably, the amount of the electrolyte additive added in step S2 accounts for 1-3 wt % of the composite electrolyte.

[0017] Preferably, the amount of electrolyte additive added in step S2 accounts for 2-3 wt% of the composite electrolyte.

[0018] Preferably, the charging operation in step S3 is: after the formation is completed, the flooded battery is charged with a constant current of 50A to 100A for 10min to 20min after the electrolyte additive is added; after the capacity decays, the flooded battery is charged with a constant current of 0.05C after the electrolyte additive is added. 20 (A)~0.08C 20 (A) Constant current charging until the battery composite electrolyte density reaches 1.285g / cm 3 ~1.295g / cm 3 . C 20 (A) is the 20-hour rated capacity of the battery.

[0019] The beneficial effects of the above technical solution are as follows: after the formation, the electrolyte additive is added to the flooded battery and a large amount of bubbles are generated by charging with a large current, which activates the plate to a certain extent, appropriately increases the porosity of the plate, further improves the discharge capacity of the battery during deep cycle discharge, and improves the parking time of the parking battery. By fully charging the capacity decay battery with constant current, the stratification of the electrolyte in the flooded battery is appropriately eliminated, and the difference in apparent density of the electrolyte in the upper and lower parts of the battery is reduced. The electrolyte additive is evenly distributed in the electrolyte in the upper and lower parts, so that the parking battery capacity can be restored to a benign operation.

[0020] Preferably, in step S1, the liquid level of the acid electrolyte is adjusted to 35 mm to 40 mm from the top surface of the battery exhaust cover, and the single cell with a low liquid level is adjusted with distilled water.

[0021] Preferably, the defoaming agent is one or more of acetylene glycol, polyethylene glycol, and propylene glycol.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention injects electrolyte additives into the flooded parking type battery to effectively alleviate the electrolyte stratification of the battery during the deep cycle of low-voltage charging, thereby slowing down the capacity decay, greatly improving the parking time of the parking type battery, and extending the deep cycle life of the battery.

[0024] The parking type battery treated by the present invention has been tested to increase the parking time by 25% to 32%, and the low voltage 100% DOD cycle life is ≥ 230 times, which greatly increases the deep cycle life of the flooded parking battery and extends the parking time of the parking battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 100% DOD cycle life comparison curve of the batteries prepared in Example 1, Example 2, Example 3 and Comparative Example 1 of the present invention;

[0026] Figure 2 This is a comparison curve of the 100% DOD cycle life of the battery in Example 4 before and after repair. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention.

[0028] The invention is to quantitatively add electrolyte additives to the flooded parking type battery after formation, and then charge it with a high current of 50A to 100A for 10min to 20min after standing for 2 to 3 days; effectively solve the problem of rapid capacity decay of the flooded parking type battery, improve the discharge capacity and increase the parking time, thereby extending the cycle life of the parking type battery. 20 (A) The current is charged until the single cell electrolyte density reaches 1.285 g / cm 3 ~1.295g / cm 3 , to achieve healthy operation of parking battery capacity recovery.

[0029] Through experimental research, it was found that quantitatively adding a mixed electrolyte additive of water-soluble nano-silicon dioxide and defoaming agent to the flooded parking type battery can increase the discharge capacity of the parking battery and improve the parking time. Nano-silicon dioxide has good surface hydrophilicity and can be evenly and stably dispersed in water. Colloidal silica can inhibit the rapid stratification of the electrolyte of the flooded parking type battery under low voltage charging (14.0V constant voltage charging) by increasing the acid viscosity, solve the problem of rapid capacity decay, maintain the discharged capacity at a certain height platform, improve the parking time and extend the deep cycle life of the parking type battery. After adding the electrolyte additive, it needs to be left to stand for 2 to 3 days to allow the electrolyte additive to be evenly mixed with the acid in the battery and form a certain gel strength.

[0030] Example 1

[0031] A 12V 200Ah flooded parking battery was selected, and the acid electrolyte level of the battery was adjusted to be consistent. The liquid level was adjusted to 36±1mm from the electrolyte level to the battery top cover, and the excess sulfuric acid solution was sucked out. Then 23g of electrolyte additive was added to each cell (the amount of electrolyte additive added was 1wt% of the composite electrolyte, including 9.2g of silica gel, 0.06g of acetylene glycol, and 13.74g of water). After being placed for 2.5 days, it was charged with a current of 50A for 20min, and the battery was subjected to a 100% cycle life test. The battery 100% DOD cycle number reached 231 times.

[0032] Example 2

[0033] A 12V 200Ah flooded parking battery was selected, and the acid electrolyte level of the battery was adjusted to be consistent. The liquid level was adjusted to 36±1mm from the electrolyte level to the battery top cover, and the excess sulfuric acid solution was sucked out. Then 45g of electrolyte additive was added to each cell (the amount of electrolyte additive added was 2wt% of the composite electrolyte, including 18.0g of silica gel, 0.13g of acetylene glycol, and 26.87g of water). After being placed for 3 days, it was charged with a current of 80A for 15min. The battery was subjected to a 100% cycle life test, and the battery 100% DOD cycle number reached 282 times.

[0034] Example 3

[0035] A 12V 200Ah flooded parking battery was selected, and the acid electrolyte level of the battery was adjusted to be consistent. The liquid level was adjusted to 36±1mm from the electrolyte level to the battery top cover, and the excess sulfuric acid solution was sucked out. Then 69g of electrolyte additive was added to each cell (the amount of electrolyte additive added was 3wt% of the composite electrolyte, including 27.6g of silica gel, 0.20g of acetylene glycol, and 41.20g of water). After being placed for 2 days, it was charged with a current of 100A for 10min. The battery was subjected to a 100% cycle life test, and the battery 100% DOD cycle number reached 294 times.

[0036] Example 4

[0037] For a 12V 200Ah parking type battery that users complained about short parking time, after fully charging and testing 100% cycle life, the capacity decayed to less than 100Ah on the 10th cycle. Add distilled water to adjust the electrolyte level to 36±1mm from the battery top cover, then add 65g of electrolyte additive to each cell (the amount of electrolyte additive added is 2.8wt% of the composite electrolyte, including 26.0g of silica gel, 0.19g of acetylene glycol, and 38.81g of water). After standing for 2 days, charge with a current of 10A until the single cell electrolyte density is 1.287g / cm 3 ~1.290g / cm 3 , the battery was re-tested for 100% cycle life with a cycle number of 253 times.

[0038] The 100% DOD cycle life of the batteries prepared in Examples 1 to 3 was compared with the 100% DOD cycle life of the battery prepared in Comparative Example 1. The comparison cycle curves are shown in FIG. Figure 1 .Depend on Figure 1It can be clearly seen that the present invention increases the discharge capacity by 25% to 32% by quantitatively adding electrolyte additives to each monomer of the flooded parking battery, thereby improving the parking time. The 100% DOD cycle number is significantly higher than the 100% DOD cycle number of the comparative example, and the 100% DOD cycle number of the battery prepared by the present invention is as high as 294 times.

[0039] from Figure 2 It can be seen from the 100% cycle life curve of Example 4 that the electrolyte additive of the present invention can also be used for repairing batteries for return of parked vehicles.

[0040] Comparative Example 1

[0041] A 12V 200Ah flooded parking type battery from the same batch as Example 1 was selected, without adding electrolyte additives, and a 100% cycle life test was carried out. The number of 100% DOD cycles of the battery was 101 times.

[0042] Comparative Example 2

[0043] The amount of electrolyte additive added is adjusted to 4wt%, and the rest is the same as in Example 1. When the amount of electrolyte additive added is greater than 3wt% of the composite electrolyte, as the proportion of SiO2 colloid in the flooded battery electrolyte increases, the battery resistance increases significantly, affecting the discharge of the battery, especially significantly reducing the initial capacity of the battery.

[0044] 100% cycle life test method:

[0045] The fully charged battery is placed in an ambient temperature of (40±2)℃ for more than 8 hours and the battery is tested according to the following steps:

[0046] a) Discharge at 25.0A until the battery terminal voltage reaches 10.50V;

[0047] b) Charge for 6 hours at (14.00±0.05)V and current limit 70A;

[0048] c) Charge again at 80.0A for 2.5min;

[0049] d) The above a) to c) constitute a complete test cycle, and the discharge capacity of the battery during the cyclic discharge is not less than 0.5C 20 , otherwise the test is terminated.

[0050] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for increasing the parking time of a flooded parking battery, characterized in that: The following steps are involved: S1: Adjust the acid electrolyte level in the flooded battery after formation or capacity decay to a safe level; S2: adding the electrolyte additive to the acid electrolyte to obtain a composite electrolyte, and leaving it to stand for 2 to 3 days; S3: charging after standing still to make the electrolyte additive and the acid electrolyte fully mixed; The electrolyte additive components are: 35-45wt% of colloidal silicon dioxide, 0.1-0.3wt% of defoaming agent, and the rest is water.

2. A method for increasing the parking time of a flooded parking battery according to claim 1, characterized in that: The electrolyte additive components are: 39-41 wt % of colloidal silicon dioxide, 0.1-0.3 % of defoaming agent, and the rest is water.

3. A method for increasing the parking time of a flooded parking battery according to claim 1, characterized in that: The amount of the electrolyte additive added in step S2 accounts for 1-3 wt % of the composite electrolyte.

4. A method for increasing the parking time of a flooded parking battery according to claim 1, characterized in that: The amount of the electrolyte additive added in step S2 accounts for 2-3 wt % of the composite electrolyte.

5. The method for increasing the parking time of a flooded parking type battery according to claim 1, characterized in that: The charging operation in step S3 is as follows: after the formation is completed, the flooded battery is charged with a constant current of 50A to 100A for 10min to 20min after the electrolyte additive is added; after the capacity decays, the flooded battery is charged with a constant current of 0.05C after the electrolyte additive is added. 20 (A)~0.08C 20 (A) Constant current charging until the battery composite electrolyte density reaches 1.285g / cm 3 ~1.295g / cm 3 .

6. A method for increasing the parking time of a flooded parking type battery according to claim 1, characterized in that: In step S1, distilled water is used to adjust the liquid level of the acid electrolyte to 35 mm to 40 mm from the top surface of the battery exhaust cover.

7. A method for increasing the parking time of a flooded parking battery according to claim 1, characterized in that: The defoaming agent is one or more of acetylenic glycol, polyethylene glycol and propylene glycol.

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