Lead acid storage battery of electric booster car and cream technique
Technical field
The present invention relates to a kind of electric boosted automobile-used lead acid accumulator and cream technique, belong to the lead acid accumulator manufacture method.
Background technology
Along with the continuous expansion of Moped Scooter volume of production and marketing, the demand of electric boosted automobile-used lead acid accumulator increases day by day.People wait in expectation as the battery of power resources, and weight is light more good more and capacity is the bigger the better, and the gravimetric specific energy of electric boosted Vehicular battery has been proposed more and more higher requirement.With the 12v10Ah battery is example, the electric boosted automobile-used lead acid accumulator product of this model in current market, and general weight is (4.2~4.3) Kg/, gravimetric specific energy is confined to (27.84~28.56) Wh/Kg.
Thereby the active material utilization of battery improves in many enterprises by the pole plate assembling slice number in the attenuate battery grid increase cell negative terminal.But increase in single lattice behind the pole plate assembling slice number, because the corresponding increase of weight ratio that in battery, occupies as the grid of conducting matrix grain, the gravimetric specific energy of battery has been difficult to raising, and the electric vehicle battery design is gone up this as thin pole plate assembling, be subjected to the restriction of mechanical strength deficiency behind the grid attenuate, further the possibility of attenuate grid is very limited.Behind the attenuate grid, the processing effect of same battery is lowered, because the grid intensity decreases, the scrappage of pole plate is also very high in the manufacture process.Other enterprises by with the cream process in, the content that increases sulfuric acid in the lead plaster improves the initial capacity of battery, to reach higher gravimetric specific energy, but because too high acid content in the lead plaster, cause the easier softening and shedding of positive active material, the easier salinization of negative electrode active material loses activity, and the cycle life of battery descends significantly.How under the prerequisite that does not influence other performances, improve the gravimetric specific energy of electric boosted Vehicular battery, drop into, reduce environmental pollution saving national resources input and consumer individual, all having realistic meaning, is the problem that each battery manufacturer man very pays close attention to.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of under the prerequisite that does not change battery structure and cycle life, improve electric boosted automobile-used lead acid accumulator gravimetric specific energy and cream technique.
Technical scheme of the present invention is: be primary raw material with the lead powder, successively add additive, pure water, sulfuric acid and make lead plaster, improvements be with the cream process in add suspension and mix, to the raw material of every 100kg lead powder, add 3~4L suspension, the proportioning of described suspension is:
Anodal suspension: deionized water 100kg, nano silicon 9.5~10.5kg, aquadag 5~10kg, ptfe emulsion 9.5~10.5kg of 60%;
Negative pole suspension: deionized water 100kg, acetylene black 4.5~5.5kg, lignin 5~6kg, carbon black 14.5~15.5kg.
In the above-mentioned and cream process adding of suspension after adding pure water and stirring 5 minutes with adding sulfuric acid before.
In the above scheme, the aquadag of adding, nano silicon and acetylene black have high dispersiveness, are convenient to be distributed in the middle of the lead plaster as far as possible uniformly.Aquadag is a resistance to oxidation conductive carbon cellulosic material, improves the electric conductivity of battery positive electrode active material effectively; Nano silicon is converted into silica gel in sulfuric acid solution, play H in the process of battery chemistries reaction
+Complexing-the release action of ion, the part orthosilicic acid of Xing Chenging is dissolved simultaneously enter solution after, the microscopic void that stays in lead plaster has increased the reaction surface of anode.By the even adding of aquadag and nano silicon, improved the chemical property of anode, improved the specific energy of anode.The acetylene black of polymolecularity adds after the negative pole, can play the effect of swelling agent, further improves the true specific area of cathode lead plaster.Because acetylene black is not dissolved substantially, therefore in the course of reaction of battery, can not move the negative interaction that produces other, and acetylene black plays catalytic action to the oxidation of lead, can promote plumbous oxidation in the polar plate solidification process in the negative pole better, improve the active material utilization of negative pole.Be chosen in the adding pure water and drop into both positive and negative polarity suspension after 5 minutes and before adding sulfuric acid, be because on the one hand this moment, lead plaster was moistening fully and mix through pure water, the lead powder part can not take place absorb suspension fully and cause the local problem of assembling of additive; On the other hand, after preventing to add sulfuric acid, will form the crystallization of basic lead sulphate in the lead plaster, the suspension composition of interpolation is difficult to enter crystallization inside.
Embodiment
Be example with the most frequently used 6-DZM-10 battery of Moped Scooter below, concrete introduce improve electric boosted automobile-used lead acid accumulator gravimetric specific energy and cream technique.
At first, supending: remove ionized water 100kg, nano silicon 10kg, aquadag 8kg, 60% ptfe emulsion 10kg, mix to stir and make anodal suspension; Remove ionized water 100kg, acetylene black 5kg, lignin 5.5kg, carbon black 15kg again, mix to stir and make negative pole suspension.Then and the system positive and negative pole lead paste: according to the form below takes by weighing lead powder, pure water, sulfuric acid and associated additives, routinely with cream technique and the system positive and negative pole lead paste:
Raw material |
The anode diachylon proportional quantity |
The cathode lead plaster proportional quantity |
Lead powder |
100Kg |
100Kg |
Red lead |
12.5Kg |
0 |
Short fiber |
0.07Kg |
0.07Kg |
Pure water |
6.5 rise |
6.5 rise |
Sulfuric acid (1.4g/ml) |
7.2 rise |
7 liters |
Barium sulfate |
0 |
0.7Kg |
Lignin |
0 |
0.1Kg |
Humic acid |
0 |
0.3Kg |
Carbon black |
0 |
0.3Kg |
Regulate water |
0~4L |
0~4L |
With the cream process in add pure water and stir 5 minutes after with add sulfuric acid before, respectively positive and negative electrode suspension 3.5L is dropped into and system in the positive and negative electrode lead plaster.The apparent gravity of control anode diachylon is (4.35~4.45) g/ml, and the apparent gravity of control cathode lead plaster is (4.45~4.55) g/ml.
According to cell manufacturing method the lead plaster of making is made pole plate and is assembled into 48 on 6-DZM-10 battery below,, further specify effect of the present invention by detecting contrast.Inject 1.235g/ml in battery, 25 ℃ analytical pure sulfuric acid solution (interior contains sodium sulfate 18g/L), single lattice are annotated the acid amount and are 128ml, change into three stages charging standard then.Changing into used equipment is 450v15A high-frequency high-power power supply.After changing into end, carry out combo according to the final voltage of battery capacity detection and the open circuit voltage of battery.Per 3 batteries are formed the battery pack of one group of 36v series, can join 16 groups.Get wherein 3 batteries dissections, analyze the brown lead oxide content in the anode plate.Actual detected result is: wherein pole plate top content is 88.3%, and the middle part is 87.2%, and the bottom is 86%, and the detection data show that the formation efficiency of battery is higher and formation effect is more even up and down.With the volumetric precipitation method analysis, testing result is 1.352g/ml, 25 ℃ to the sulfuric acid concentration in the glass fibre separator.
Remaining 15 Battery packs are placed in 25 ℃ ± 2 ℃ the environment, till being discharged to whole group termination voltage 31.5v with constant current 5A, the discharge time of battery is all more than 150 minutes, gravimetric specific energy is greater than 36.40Wh/Kg, prolong about 10~12 minutes discharge time than normal battery, and the Capacity Ratio between the battery pack is more approaching.
The particular capacity testing result is as follows:
Group number |
Discharge time (min) |
Discharge capacity (Ah) |
Battery weight (Kg) |
Gravimetric specific energy (Wh/Kg) |
Group number |
Discharge time (min) |
Discharge capacity (Ah) |
Battery weight (Kg) |
Gravimetric specific energy (Wh/Kg) |
1 |
152 |
12.67 |
4.22 |
36.03 |
9 |
156 |
13.00 |
4.24 |
36.79 |
2 |
154 |
12.83 |
4.23 |
36.40 |
10 |
155 |
12.92 |
4.22 |
36.74 |
3 |
154 |
12.83 |
4.21 |
36.57 |
11 |
153 |
12.75 |
4.20 |
36.43 |
4 |
151 |
12.58 |
4.23 |
35.69 |
12 |
152 |
12.67 |
4.20 |
36.20 |
5 |
155 |
12.92 |
4.24 |
36.57 |
13 |
157 |
13.08 |
4.23 |
37.11 |
6 |
155 |
12.92 |
4.22 |
36.74 |
14 |
151 |
12.58 |
4.21 |
35.86 |
7 |
153 |
12.75 |
4.21 |
36.34 |
15 |
154 |
12.83 |
4.22 |
36.48 |
8 |
157 |
13.08 |
4.24 |
37.02 |
|
|
|
|
|
From above-mentioned battery, get the parallel comparison of 2 Battery packs with normal battery, in 25 ℃ ± 2 ℃ environment,,, constitute Rapid Cycle like this one time then with 10A constant current charge 45min with 15A discharge 24min, back and forth carry out.When battery power discharge voltage is lower than 31.5v, the Rapid Cycle end-of-life, two Battery pack actual detected Rapid Cycle life-spans were respectively 282 times and 290 times, and the normal battery actual detected Rapid Cycle life-span is respectively 255 times and 257 times.
From above-mentioned battery, get in addition 4 groups of test cells in 25 ℃ ± 2 ℃ environment with two groups of normal battery, be discharged to battery pack final pressure 31.5v with constant current 5A, with constant voltage 44.4v, current limliting 1.8A charging 10h, constitute 100%DOD (100% a depth of discharge) life-span to circulate then.When be lower than 84min the discharge time of battery pack, be judged as cycle life and stop.4 groups of test cell 100%DOD (100% depth of discharge) cycle life has been carried out respectively 371 times, 366 times, 372 times, 377 times; Normal battery is respectively 350 times and 341 times.