Method for pretreating raw polar plates for internal formation

A raw plate and pretreatment technology, applied in the direction of lead-acid battery electrodes, etc., can solve the problems of uneven dispersion of colloidal electrolyte, high temperature of battery acid addition, high formation temperature, etc., to improve capacity consistency and capacity pass rate, The effect of reducing floating powder on the surface and stabilizing temperature change

Active Publication Date: 2013-04-10
TIANNENG BATTERY GROUP
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  • Application Information

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Problems solved by technology

[0005] The invention provides a pretreatment method for internal formation of raw plates, the method has simple steps, solves the problems of high acid addition temperature and high formation temperature of batteries in the prior art, and improves battery capacity consistency and capacity pass rate , solves the problem of uneven dispersion of colloidal electrolyte due to uneven temperature, eliminates the problems of poor state of separators formed by traditional internalization, white flowers on plates, and unclean poles, thereby improving the overall performance of the product and prolonging the product cycle. life

Method used

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  • Method for pretreating raw polar plates for internal formation
  • Method for pretreating raw polar plates for internal formation
  • Method for pretreating raw polar plates for internal formation

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Experimental program
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Embodiment 1

[0024] Pickling treatment: use low-density 1.08g / mL (25°C) dilute sulfuric acid to completely immerse the plate, the temperature of dilute sulfuric acid is required to be 10°C, the soaking time of the positive plate is 80 minutes, and the soaking time of the negative plate is 40 minutes.

[0025] Secondary drying treatment: After the soaking time is completed, the plate is taken out and placed on the curing rack (the method is the same as that of the coated plate and placed on the curing rack), enters the drying room, and adopts temperature segmental drying, the first segment is 45 ° C × 3h, the second section 65℃×6h, the third section 35℃×3h.

[0026] After the plate is dried, we take a sample to test the content of the plate material. The plate before the above treatment is also analyzed for the substance content:

[0027] Positive plate: test at 4 points respectively (for distribution of test points, see figure 1 ), the results are shown in Table 1:

[0028] Table 1

[...

Embodiment 2

[0065] Pickling treatment: Use dilute sulfuric acid with a density of 1.18g / mL (25°C) to completely immerse the plate. The temperature of the dilute sulfuric acid is required to be 25°C. The immersion time for the positive plate is 60 minutes, and the immersion time for the negative plate is 30 minutes.

[0066] Secondary drying treatment: After the soaking time is completed, the plate is taken out and placed on the curing rack (the method is the same as that of the coated plate and placed on the curing rack), enters the drying room, and adopts temperature segmental drying, the first segment is 50℃× 3h, the second section 75℃×6h, the third section 40℃×3h.

[0067] After the plate is dried, we take a sample to test the content of the plate material. The plate before the above treatment is also analyzed for the substance content:

[0068] Positive plate: test 4 points separately (test points such as figure 1 Shown), the test results are shown in Table 5:

[0069] table 5

[...

Embodiment 3

[0106] Pickling treatment: Use dilute sulfuric acid with a density of 1.28g / mL (25°C) to completely immerse the plate. The temperature of the dilute sulfuric acid is required to be 35°C. The immersion time for the positive plate is 40 minutes, and the immersion time for the negative plate is 20 minutes.

[0107] Secondary drying treatment: After the soaking time is completed, the plate is taken out and placed on the curing rack (the method is the same as that of the coated plate and placed on the curing rack), enters the drying room, and adopts temperature segmental drying, the first segment is 55 ° C × 3h, the second section 85℃×6h, the third section 45℃×3h.

[0108] After the plate is dried, we take a sample to test the content of the plate material. The plate before the above treatment is also analyzed for the substance content:

[0109] Positive plate: test at 4 points respectively (for distribution of test points, see figure 1 ), the test results are shown in Table 9: ...

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Abstract

The invention discloses a method for pretreating raw polar plates for internal formation. The method comprises the following steps: (1), soaking the raw polar plates subjected to solidification and drying into dilute sulfuric acid with the density of 1.01 to 1.40 g / mL (at the temperature of 25 DEG C), wherein the soaking time of the positive plate is 20 to 80 minutes and the soaking time of the negative plate is 10 to 50 minutes; and (2), drying the soaked raw polar plates. By the pretreatment method, the raw polar plates are pretreated, the floating powder on the surfaces of the polar plates is obviously reduced, and dust pollution on a clamping board and a sheet wrapping board is basically avoided in the turnover process and the sheet wrapping process of the polar plates. By the pretreatment method, the temperature basically keeps at 30 to 35 DEG C after a battery is acidified, the battery temperature basically maintains to be 40 to 45 DEG C in the charging process, and advantages are brought to formation of the polar plates, so that bad hidden danger is reduced during the traditional internal formation production.

Description

technical field [0001] The invention relates to the technical field of internal formation of lead-acid batteries, in particular to a pretreatment method of a raw electrode plate for internal formation. Background technique [0002] The formation of the plate refers to the process of using chemical and electrochemical reactions to convert the plate into positive and negative plates with electrochemical characteristics. The main part of the lead paste material of the electrode plate before formation is the same, which is composed of lead oxide, metallic lead, lead sulfate, tribasic lead sulfate or tetrabasic lead sulfate, etc. In principle, there is no distinction between positive and negative electrodes . Through the process of chemical formation, the electrode paste material that is going to form the positive plate is transformed into a phase structure mainly composed of lead dioxide to form a positive plate, and at the same time the electrode paste material that is ready t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/16
CPCY02E60/10
Inventor 陈清元李桂发张天任沈旭培张林山夏俊礼高根芳刘清平刘玉邓成智代飞吴飞宋文龙
Owner TIANNENG BATTERY GROUP
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