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Impregnation liquid for treating negative plate of dry charge battery, negative plate and battery

A battery negative electrode and impregnating liquid technology, which is applied to lead-acid battery electrodes, secondary battery charging/discharging, secondary batteries, etc., can solve problems such as long discharge time, increased internal resistance of the plate, and poor hydrophobicity of the negative plate. Achieve the effect of washing-free drying process, enhancing anti-oxidation and reducing waste of resources

Active Publication Date: 2021-07-13
TIANNENG BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the negative plate treatment process in the above-mentioned patent documents are: a. The discharge time after formation is very long (continuing 20-30min), so that the active material formed by charging is transformed into a thicker lead sulfate layer, which not only significantly increases the thickness of the plate. The internal resistance also causes the negative plate to lose 5-10% of the charge, which virtually reduces the effective power of the plate and has a negative impact on the performance of the lead-acid battery; b. The "hydrophobicity" of the negative plate after boric acid treatment is poor , the negative electrode plate is in a bare state during the treatment process, and the sealing protection is not tight. It will still absorb moisture and oxygen in the air and be oxidized, which will affect the dry charge performance of the lead-acid battery; c. Because the impregnation process is carried out in a non-closed environment, And using a higher temperature, the acid mist formed by evaporation is harmful to human body; d. The drying time is 12-20 hours, and the production efficiency is low

Method used

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  • Impregnation liquid for treating negative plate of dry charge battery, negative plate and battery
  • Impregnation liquid for treating negative plate of dry charge battery, negative plate and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The external chemical formation process is used to form the negative plate, and the charge and discharge current at each stage is calculated according to the effective area of ​​the negative plate. The steps are as follows:

[0029] (1) Reverse charging: use 4~5mA / cm 2 The current is reverse charged for 0.5h;

[0030] (2) Multi-stage charging: first use 6mA / cm 2 Charge with a current of 1.0h; then use 12mA / cm 2 Charge with current for 8.0h; then use 9mA / cm 2 Charge with current for 5.0h; finally use 6mA / cm 2 charging current for 4.5h;

[0031] (3) High current instantaneous discharge: at 50mA / cm 2 The current discharge 1.0min.

[0032] Pour butylated hydroxyanisole into an ethanol solution with a volume concentration of 25% and stir for 6-8 minutes to form an impregnation solution 1. The mass ratio of butylated hydroxyanisole and ethanol with a volume concentration of 25% in the impregnation solution 1 is 5:95.

[0033] Place the formed negative plates at interva...

Embodiment 2

[0037] The external chemical formation process is used to form the negative plate, and the charge and discharge current at each stage is calculated according to the effective area of ​​the negative plate. The steps are as follows:

[0038] (1) Reverse charging: use 4~5mA / cm 2 The current is reverse charged for 0.5h;

[0039] (2) Multi-stage charging: first use 6mA / cm 2 Charge with a current of 1.0h; then use 12mA / cm 2 Charge with current for 8.0h; then use 9mA / cm 2 Charge with current for 5.0h; finally use 6mA / cm 2 charging current for 4.5h;

[0040] (3) High current instantaneous discharge: at 50mA / cm 2 The current discharge 1.0min.

[0041] Pour butylated hydroxyanisole into an ethanol solution with a volume concentration of 25% and pre-stir for 1 to 3 minutes, then add citric acid, and continue stirring for 6 to 8 minutes to form an impregnation solution 2. In the impregnation solution 2, butylated hydroxyanisole, The mass ratio of ethanol with a volume concentration...

Embodiment 3

[0055] The negative plates that meet the dry load performance requirements in Example 1 are assembled into lead storage batteries. The model of the lead storage battery is 6-QA-60. After being placed in an environment with a humidity not exceeding 80% for 12 months, the density of injection into the lead-acid battery is 1.280±0.005g / cm 3 Sulfuric acid electrolyte, adjust the liquid level to the specified value, let it stand for 20 minutes and then discharge it with a current of 500A for 30s. The standard requires that the discharge voltage within 30s should not be lower than 7.2V. Tested and recorded the voltage values ​​of lead-acid batteries at 5s, 10s, and 30s. At the same time, the lead oxide content of the two negative plates was detected. The results are shown in Table 1. The electrolyte temperature before discharge is 37°C, and there is no acid spillage.

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Abstract

The invention discloses impregnation liquid for treating a negative plate of a dry-charged battery, the negative plate and a battery, and belongs to the technical field of lead storage batteries. The invention aims to provide a method for reducing the oxidation of the negative plate in the production process and the later application process, so that the voltage of the dry-charged battery is improved, and the electrolyte temperature before the discharge of the dry-charged battery is reduced. The impregnation liquid comprises the following components of butyl hydroxy anisd, citric acid and ethanol with the volume concentration of 25% according to the mass ratio of 5: (0-0.5): (94.5-95). After a lead storage battery assembled by the negative plate treated by the impregnation liquid is acidified for 20 minutes, the temperature of the electrolyte is not obviously increased, and the dry-load starting performance of the lead storage battery is better.

Description

technical field [0001] The invention belongs to the technical field of lead accumulators, and in particular relates to an impregnating solution for treating the negative plate of a dry-charge battery, a negative plate and a battery. Background technique [0002] As a cost-effective, stable and reliable DC power supply, lead-acid batteries have entered all aspects of our work and life and are closely related to our lives. Dry-charged lead-acid batteries, because no electrolyte is added before use, and the internal active materials are in a dry state, can usually store the charge obtained during the manufacturing process for a long time (at least one year). In addition, ordinary lead-acid batteries with sulfuric acid electrolyte are dangerous goods, which bring certain difficulties to storage, transportation and other activities. Therefore, dry-type charged lead-acid batteries still occupy a certain market under certain conditions and specific usage scenarios. [0003] In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/16H01M10/12H01M10/44
CPCH01M4/16H01M10/12H01M10/446Y02P70/50
Inventor 陈群陈勤忠刘焯马有帅徐大勇刘克宇杨光华李越南周代辉邱华良高银王娟
Owner TIANNENG BATTERY GROUP
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