Device and method for testing zinc gel expansion rate and negative electrode gassing amount of alkaline manganese battery

Abstract

The invention relates to the technical field of alkaline manganese batteries, and particularly discloses a device and method for testing the calamine gel expansion rate and the negative electrode gas evolution amount of the alkaline manganese battery, the device for testing the calamine gel expansion rate comprises a plastic pipe with scales and a rubber balloon, the plastic pipe with the scales is arranged in a constant-temperature water bath, to-be-tested calamine gel is firstly added into the plastic pipe with the scales, and then the rubber balloon is added into the plastic pipe with the scales; then liquid paraffin is added for liquid sealing, and a rubber balloon is connected to an opening of the plastic pipe with the scales; the device for testing the gas evolution amount of the negative electrode comprises a gas collecting tube with a graduated conical opening and a transparent container, and the gas collecting tube with the graduated conical opening is fixedly and inversely placed in the transparent glass container through an iron stand. The testing method can be used for simultaneously testing the expansion rate of the zinc cream and the gassing amount of the negative electrode zinc powder, is convenient to operate and can be used for directly evaluating the safety of the negative electrode.

Description

Technical Field

[0001] The invention relates to the technical field of alkaline manganese batteries, in particular to a device and method for testing the expansion rate of zinc paste and negative electrode gas evolution of alkaline manganese batteries. Background Art

[0002] At present, for alkaline zinc-manganese batteries, the gas evolution of negative zinc powder and the expansion rate of zinc paste are tested separately. Zinc powder is generally directly added to about 40% KOH electrolyte and then placed in a liquid paraffin environment to test the gas evolution of zinc powder, while zinc paste is prepared zinc paste, which is isolated from the outside air by liquid paraffin and then tested for its expansion rate. The two methods are evaluated separately, and due to different test environments, certain errors may be caused, or other factors may be introduced to affect the test results. Summary of the invention

[0003] In order to simultaneously test the gas evolution amount of the negative electrode zinc powder and the expansion rate of the zinc paste, the present invention discloses a testing device and method for the gas evolution amount of the negative electrode and the expansion rate of the zinc paste. The expansion rate of the zinc paste and the gas evolution amount of the negative electrode zinc powder are tested simultaneously, which is convenient to operate and can more directly evaluate the safety of the negative electrode.

[0004] In order to achieve the above technical objectives, the present invention discloses an alkaline manganese battery zinc paste expansion rate testing device, the testing device comprising a plastic tube with a scale and a rubber balloon, the plastic tube with a scale is placed in a constant temperature water bath, the zinc paste to be tested is first added to the plastic tube with a scale, then liquid paraffin is added for liquid sealing, and a rubber balloon is connected to the mouth of the plastic tube with a scale.

[0005] Furthermore, the diameter of the graduated plastic tube is 26-28 mm, and the volume is 55-60 ml.

[0006] Furthermore, distilled water is added to the constant temperature water bath, and the temperature is set to 70°C.

[0007] A test device for the gas evolution amount of the negative electrode of an alkaline manganese battery comprises a gas collecting pipe with a scale cone mouth and a transparent container. The gas collecting pipe with a scale cone mouth is fixed by an iron frame and placed upside down in the transparent glass container. The gas collecting pipe is filled with distilled water, and the transparent glass container is filled with 80% to 90% of the volume of water.

[0008] Furthermore, the rubber balloon is made of high-quality alkali-resistant rubber; the graduated conical-mouthed gas collecting pipe and the transparent container are made of glass.

[0009] A method for testing the gas evolution amount of negative electrode zinc powder and the expansion rate of zinc paste using the above device, the method comprising the following steps:

[0010] (1) Take 20-25 ml of the zinc paste to be tested and add it into a graduated plastic tube, then place the plastic tube in a planetary vacuum degassing machine to remove the bubbles brought into the zinc paste;

[0011] (2) After adding 10-15 ml of chemically pure liquid paraffin for liquid sealing, connect a rubber balloon to the graduated plastic tube mouth, read and record the scale value of the zinc paste liquid level and the scale value of the liquid paraffin. When connecting the rubber balloon, the gas in the balloon must be exhausted. The rubber balloon connected to the graduated plastic tube mouth should be deflated.

[0012] (3) Place the graduated plastic tube in a 70°C constant temperature water bath, read and record the scale value of the liquid paraffin every 24 hours, and record the state of the rubber balloon. Measure continuously for N days and record the data; calculate the expansion rate of the zinc paste:

[0013]

[0014] (4) After the Nth day, tie the mouth of the rubber balloon with a tie string and place it in a transparent container filled with water;

[0015] (5) Loosen the rubber balloon's tie rope and collect the gas into a graduated gas collecting tube. The reading of the scale is the gas evolution amount of the zinc paste.

[0016] Furthermore, the number of consecutive measurement days N is 2 to 5 days.

[0017] Beneficial effects of the present invention:

[0018] The testing method of the present invention can effectively reduce the influence of air brought into the zinc paste on the gas evolution amount of zinc powder and the expansion rate of the zinc paste, and can simultaneously test the gas evolution amount and expansion rate of the same zinc paste sample. The method is simple and effective, and has important significance for actual production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the zinc paste expansion rate testing device of the present invention

[0020] Figure 2 Schematic diagram of the gas evolution test device of zinc paste of the present invention

[0021] Reference numerals: 1-constant temperature water bath, 2-pure water, 3-scaled plastic tube, 4-rubber balloon, 5-liquid paraffin, 6-negative zinc paste, 7-iron stand, 8-transparent container, 9-tie rope, 10-scaled conical gas collecting pipe DETAILED DESCRIPTION

[0022] In order to deepen the understanding of the present invention by those skilled in the art, the present invention will be further described below in conjunction with specific embodiments:

[0023] A testing device comprises a plastic tube with a scale and a rubber balloon. The plastic tube with a scale is placed in a constant temperature water bath with pure water added therein, zinc paste to be tested and liquid paraffin are added to the plastic tube with a scale, and the mouth of the plastic tube is connected to a rubber balloon. The water temperature of the constant temperature water bath is set at 70°C, the diameter of the plastic tube with a scale is 28mm, the volume is 55ml, and the amount of liquid paraffin added is 15ml.

[0024] The specific test steps are as follows:

[0025] The first step is to take 300g of the prepared zinc paste (the preparation ratio is 100 parts of zinc powder, 1 part of binder, and 55 parts of 36% KOH aqueous solution), divide it into 3 parallel samples, add them into a graduated plastic tube, and add 20-25ml. Then put it in a planetary vacuum degassing machine to remove the bubbles brought into the zinc paste;

[0026] The second step is to add 15 ml of chemically pure liquid paraffin for liquid sealing, then put a rubber balloon on the mouth of the plastic tube with a scale, read and record the scale value of the zinc paste liquid level and the scale value of the liquid paraffin, and the rubber balloon should be deflated at this time.

[0027] Step 3: Place the plastic tube with scale in a 70°C constant temperature water bath, read and record the scale value of the liquid paraffin every 24 hours, and record the state of the rubber balloon. Measure continuously for 3 days and record the data.

[0028] Step 4: Tie the mouth of the rubber balloon with a tie rope and place it in a transparent container filled with water.

[0029] Step 5. Loosen the rubber balloon's tie rope and collect the gas into a graduated gas collecting tube. Reading the graduation is the amount of gas evolution from the zinc paste.

[0030] Table 1: Test data

[0031]

[0032] From the above, it can be seen that the test results of the present invention can normally and accurately obtain the gas evolution amount and expansion rate of the negative electrode zinc paste, and can effectively evaluate the safety of the negative electrode of the alkaline manganese battery.

Claims

1. An alkaline manganese battery zinc paste expansion rate testing device, characterized in that: The testing device comprises a plastic tube with scale and a rubber balloon. The plastic tube with scale is placed in a constant temperature water bath. The zinc paste to be tested is first added into the plastic tube with scale, and then liquid paraffin is added for liquid sealing, and a rubber balloon is connected to the mouth of the plastic tube with scale.

2. The zinc paste expansion rate testing device according to claim 1, characterized in that: The diameter of the graduated plastic tube is 26-28 mm, and the volume is 55-60 ml.

3. The zinc paste expansion rate testing device according to claim 2, characterized in that: Add distilled water into the constant temperature water bath and set the temperature to 70°C.

4. The zinc paste expansion rate testing device according to claim 1, characterized in that: The rubber balloon is made of high-quality alkali-resistant rubber.

5. A device for testing the gas evolution of the negative electrode of an alkaline manganese battery, characterized in that: The testing device comprises a conical gas collecting pipe with scale and a transparent container. The conical gas collecting pipe with scale is fixed by an iron frame and placed upside down in the transparent glass container. The gas collecting pipe is filled with distilled water, and the transparent glass container is filled with 80% to 90% of the volume of water.

6. The device for testing the negative electrode gas evolution amount according to claim 5, characterized in that: The graduated conical-mouthed gas collecting pipe and the transparent container are made of glass.

7. A method for testing the gas evolution amount of negative electrode zinc powder and the expansion rate of zinc paste using the device described in 1 to 6, the method comprising the following steps: (1) Take 20-25 ml of the zinc paste to be tested and add it into a graduated plastic tube, then place the plastic tube in a planetary vacuum degassing machine to remove the bubbles brought into the zinc paste; (2) After adding 10-15 ml of chemically pure liquid paraffin for liquid sealing, connect a rubber balloon to the graduated plastic tube mouth, read and record the scale value of the zinc paste liquid level and the scale value of the liquid paraffin. When connecting the rubber balloon, the gas in the balloon must be exhausted. The rubber balloon connected to the graduated plastic tube mouth should be deflated. (3) Place the graduated plastic tube in a 70°C constant temperature water bath, read and record the scale value of the liquid paraffin every 24 hours, and record the state of the rubber balloon. Measure continuously for N days and record the data; calculate the expansion rate of the zinc paste: (4) After the Nth day, tie the mouth of the rubber balloon with a tie string and place it in a transparent container filled with water; (5) Loosen the rubber balloon's tie rope and collect the gas into a graduated gas collecting tube. The reading of the scale is the gas evolution amount of the zinc paste.

8. The testing method according to claim 7, characterized in that: The continuous measurement days N are 2 to 5 days.

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