Storage battery and preparation method thereof

Abstract

The invention discloses a storage battery and a preparation method thereof, which are applied to the field of batteries, an annular groove and an anticorrosive coating are arranged on the outer circumferential surface of a pole, an anticorrosive coating is arranged on the surface of a busbar, and the pole and a battery shell are sealed; the positive lead plaster comprises 1000 parts of lead powder, 100-106 parts of dilute sulphuric acid, 0.6 part of short fiber, 90-120 parts of purified water and 12 parts of tetrabasic lead sulfate, and the negative lead plaster comprises 1000 parts of lead powder, 94-100 parts of dilute sulphuric acid, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber and 90-120 parts of purified water; a catalyst is arranged in the battery shell. According to the invention, the crystal nucleus size of the positive electrode lead paste can be reduced, the porosity can be increased, sulfation of the negative electrode lead paste can be inhibited, floating charge current and hydrogen precipitation can be reduced, the catalyst can reduce water loss, and electrolyte corrosion can be reduced by sealing the anticorrosive layer, the annular groove, the pole and the battery shell.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and particularly to a storage battery and a method for preparing the same. Background Art

[0002] In view of the problem that a computer room air conditioner needs to be configured when a lead-acid battery is working, in order to adapt to the low-carbon development plan, it is necessary to reduce the configuration of the computer room air conditioner, reduce the frequency of air conditioner use, and increase the ambient temperature of the lead-acid battery. However, when the ambient temperature rises, it will accelerate the electrochemical reaction in the lead-acid battery, resulting in water loss of the lead-acid battery. The water loss of the lead-acid battery increases the density of the electrolyte in the battery, accelerates the corrosion of the bus bar, causes the bus bar to become thinner or break, and at the same time, the electrolyte climbs upward along the pole column, which will corrode the surface of the pole column, affecting the performance and life of the battery. At the same time, the negative active material is prone to shrink at high temperature, resulting in a decrease in battery capacity.

[0003] Therefore, how to provide a method to reduce the corrosion of the electrolyte on the bus bar and the pole column in a high-temperature environment, and avoid the reduction and damage of battery capacity, is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a storage battery and a method for preparing the same, which solve the problems in the prior art that when the ambient temperature rises, the electrochemical reaction in the lead-acid battery is accelerated, resulting in water loss of the lead-acid battery. The water loss of the lead-acid battery increases the density of the electrolyte in the battery, accelerates the corrosion of the bus bar, causes the bus bar to become thinner or break, and at the same time, the electrolyte climbs upward along the pole column, which will corrode the surface of the pole column, affecting the performance and life of the battery. At the same time, the negative active material is prone to shrink at high temperature, resulting in a decrease in battery capacity.

[0005] To solve the above technical problems, the present invention provides a storage battery, including:

[0006] A plate group assembly, a bus bar, a pole column, an electrolyte, and a battery housing for containing the plate group assembly, the bus bar, the pole column, and the electrolyte;

[0007] One end of the bus bar is connected to the plate group assembly, the other end of the bus bar is connected to the pole column, and a plurality of annular grooves are axially arranged on the outer circumferential surface of the pole column. An anti-corrosion layer is provided on the outer circumferential surface of the pole column, the surface of the bus bar adjacent to the pole column, and the outer circumferential surface of the bus bar;

[0008] The battery housing is provided with a pole column hole for fixing the pole column. The part of the pole column extending into the pole column hole is filled with a sealing rubber ring, a sealing ring, a compression gasket nut, and a color glue in sequence along the direction pointing to the outside of the battery housing;

[0009] The electrode group assembly includes alternately arranged positive plates and negative plates, and a separator disposed between the positive plates and the negative plates. The positive plate includes a positive plate grid and positive lead paste cured at the positive plate grid. The negative plate includes a negative plate grid and negative lead paste cured at the negative plate grid. Before curing and drying, the preparation raw materials of the positive lead paste include, by weight, 1000 parts of lead powder, 100 - 106 parts of dilute sulfuric acid, 0.6 part of short fiber, 90 - 120 parts of pure water, and 12 parts of tribasic lead sulfate. Before curing and drying, the preparation raw materials of the negative lead paste include, by weight, 1000 parts of lead powder, 94 - 100 parts of dilute sulfuric acid, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber, and 90 - 120 parts of pure water;

[0010] The battery housing is provided with a gas discharge valve, and a catalyst for catalyzing the reaction of hydrogen and oxygen to form water is disposed at a position in the battery housing close to the gas discharge valve.

[0011] Optionally, in the positive lead paste cured at the positive plate grid, the ratio of tribasic lead sulfate to the mass of the positive lead paste is 0.5% - 1%.

[0012] Optionally, a catalyst placement cavity is disposed in the battery housing. One end of the catalyst placement cavity is in communication with the interior of the battery housing, and the other end of the catalyst placement cavity is in communication with the gas discharge valve;

[0013] The catalyst is placed in the catalyst placement cavity.

[0014] Optionally, both the positive plate grid and the negative plate grid include a frame and ribs arranged in a grid shape within the frame;

[0015] Both the frame and the ribs include a crystal nucleating agent.

[0016] Optionally, the battery housing is formed by blending acrylonitrile - butadiene - styrene copolymer, liquid crystal polymer, and polyphthalamide.

[0017] Optionally, on the outer circumferential surface of the terminal post, a vulcanized rubber sleeve is disposed on the side of the annular groove close to the bus bar. On the surface of the outer circumferential surface of the terminal post on the side of the vulcanized rubber sleeve close to the bus bar, on the surface of the bus bar close to the terminal post, and on the outer circumferential surface of the bus bar, epoxy resin sealant is disposed;

[0018] The vulcanized rubber sleeve and the epoxy resin sealant together form the anticorrosive layer.

[0019] Optionally, on the side of the busbar facing the electrode group assembly, an epoxy resin sealant is provided at the area in contact with the electrode group assembly.

[0020] Optionally, on the outer circumferential surface of the terminal post corresponding to the location where the epoxy resin sealant is provided, a number of annular protrusion structures or annular recess structures are axially provided.

[0021] Optionally, an electrolytic solution containing magnesium sulfate heptahydrate crystals is attached to the electrode group assembly. The crystal particles of the magnesium sulfate heptahydrate crystals are 0.1 mm to 1 mm, and the ratio of the mass of the crystals to the mass of the electrolytic solution is 1% - 3%.

[0022] The present invention also provides a method for preparing a storage battery for preparing the storage battery as described above, including:

[0023] By weight, mix the raw materials including 1000 parts of lead powder, 0.6 part of short fiber, and 12 parts of tribasic lead sulfate. Add water to the mixture after dry stirring according to the water addition ratio of 90 - 120 parts of pure water, and perform wet stirring operation. Then add acid to the mixture after wet stirring according to the acid addition ratio of 100 - 106 parts of dilute sulfuric acid, and discharge the paste after stirring to prepare the positive electrode lead paste; by weight, mix the raw materials including 1000 parts of lead powder, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, and 0.8 part of short fiber. Add water to the mixture after dry stirring according to the water addition ratio of 90 - 120 parts of pure water, and perform wet stirring operation. Then add acid to the mixture after wet stirring according to the acid addition ratio of 94 - 100 parts of dilute sulfuric acid, and discharge the paste after stirring to prepare the negative electrode lead paste;

[0024] Uniformly coat the positive electrode lead paste on the positive electrode grid to prepare a positive electrode plate preform, and uniformly coat the negative electrode lead paste on the negative electrode grid to prepare a negative electrode plate preform; dry the positive electrode plate preform at a temperature of 75 - 85 °C to obtain a dried positive electrode plate, and dry the negative electrode plate preform at a temperature of 65 - 75 °C to obtain a dried negative electrode plate;

[0025] Arrange the positive electrode plates and the negative electrode plates alternately. Place a separator between adjacent positive electrode plates and negative electrode plates, and connect and fix the positive electrode plates, the separator, and the negative electrode plates in sequence, and correspondingly connect the busbar and the terminal post, and install them in the battery housing in cooperation with the electrolytic solution.

[0026] It can be seen that the storage battery provided by the present invention includes a plate group assembly, a bus bar, a terminal post, and an electrolyte, as well as a battery case for containing the plate group assembly, the bus bar, the terminal post, and the electrolyte; one end of the bus bar is connected to the plate group assembly, the other end of the bus bar is connected to the terminal post, and a plurality of annular grooves are axially arranged on the outer circumferential surface of the terminal post. An anti-corrosion layer is provided on the outer circumferential surface of the terminal post, on the surface of the bus bar adjacent to the terminal post, and on the outer circumferential surface of the bus bar; the battery case is provided with a terminal post hole for fixing the terminal post, and in the part of the terminal post extending into the terminal post hole, a sealing rubber ring, a sealing ring, a compression pad nut, and a color glue are sequentially filled in the direction pointing to the outside of the battery case; the plate group assembly includes alternately arranged positive plates and negative plates, and a separator disposed between the positive plates and the negative plates. The positive plate includes a positive plate grid and positive lead paste cured at the positive plate grid, and the negative plate includes a negative plate grid and negative lead paste cured at the negative plate grid; before curing and drying, by weight, the preparation raw materials of the positive lead paste include 1000 parts of lead powder, 100 - 106 parts of dilute sulfuric acid, 0.6 part of short fiber, 90 - 120 parts of pure water, and 12 parts of tribasic lead sulfate. Before curing and drying, by weight, the preparation raw materials of the negative lead paste include 1000 parts of lead powder, 94 - 100 parts of dilute sulfuric acid, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber, and 90 - 120 parts of pure water; the battery case is provided with a gas discharge valve, and a catalyst for catalyzing the reaction of hydrogen and oxygen to generate water is provided at a position in the battery case close to the gas discharge valve. By setting the positive lead paste and the negative lead paste before curing and drying according to the above specific components, on the one hand, for the positive plate, it can reduce the uniform density of the lead paste particles, reduce the crystal nucleus size, increase the porosity of the lead paste, improve the conductivity of the positive plate, increase the strength of the lead paste, improve the performance and service life of the storage battery. On the other hand, it can improve the conductivity of the negative plate, inhibit negative plate sulfation, prevent the increase of floating charge current and water loss caused by excessive hydrogen evolution, avoid the shrinkage of negative active substances at high temperatures. At the same time, by setting a catalyst at a position in the battery case close to the gas discharge valve, it can further reduce the water loss of the battery. By setting an anti-corrosion layer on the surfaces of the above-mentioned terminal post and bus bar, setting annular grooves on the surface of the terminal post, and setting the seal between the terminal post and the battery case, the acid creep and corrosion of the electrolyte can be reduced.

[0027] In addition, the present invention also provides a method for preparing a storage battery, which also has the above beneficial effects. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0029] Figure 1 It is an example diagram of the floating charge current varying with temperature in an existing storage battery;

[0030] Figure 2 It is a schematic structural diagram of a storage battery provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic structural diagram of the fixation of the electrode group assembly, bus bar and electrode post in a storage battery provided by an embodiment of the present invention;

[0032] Figure 4 It is a schematic combined front view and side view structural diagram of a positive electrode plate in a storage battery provided by an embodiment of the present invention;

[0033] Figure 5 It is a schematic structural diagram of a positive electrode plate grid in a storage battery provided by an embodiment of the present invention;

[0034] Figure 6 It is a flow chart of a method for preparing a storage battery provided by an embodiment of the present invention;

[0035] Figures 2 to 5 In the figure, the reference numerals are explained as follows:

[0036] 1 - Catalyst placement area, 10 - Electrode group assembly, 20 - Battery housing, 30 - Gas discharge valve, 40 - Electrode post, 41 - Anticorrosion layer, 50 - Bus bar, 60 - Negative electrode plate, 70 - Positive electrode plate, 71 - Positive electrode lead paste, 72 - Positive electrode plate grid, 80 - Separator, 91 - Frame, 92 - Rib. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] The following problems exist when an existing lead - acid storage battery works in a high - temperature environment:

[0039] (1) Water loss of the storage battery. When the temperature rises, it will accelerate the rate of the electrochemical reaction of the storage battery. The oxygen evolution at the positive electrode increases, and the oxygen recombination at the negative electrode intensifies. A large amount of heat is generated during oxygen recombination. As the internal pressure of the battery increases, oxygen, hydrogen and water vapor will escape through the gas discharge valve, resulting in an increase in water loss of the lead - acid storage battery. The loss of water in the electrolyte reduces the capacity of the storage battery.

[0040] (2) The floating charge current increases. As the temperature of the battery increases, the floating charge current of the battery will increase, which will increase the risk of thermal runaway of the battery. Reference can be made to Figure 1 , Figure 1 which is an example diagram of the change of the floating charge current with temperature in an existing battery.

[0041] (3) The bus bar and the terminal post are corroded. The loss of water increases the density of the electrolyte, accelerates the corrosion of the bus bar and the terminal post, and then causes the bus bar to become thinner or break, damaging the battery.

[0042] (4) The shrinkage of the negative active material. Expanding agents are usually added to the negative lead paste to prevent the shrinkage and agglomeration of spongy lead. This shrinkage and agglomeration reduce the effective area of the reaction of the negative active material, and at the same time cause tiny cracks in the negative plate, thereby gradually reducing the battery capacity.

[0043] In the present invention, by setting the positive lead paste and the negative lead paste before curing and drying according to the above specific components, on the one hand, for the positive plate, it can reduce the uniform density of the lead paste particles, reduce the crystal nucleus size, increase the porosity of the lead paste, improve the conductivity of the positive plate, increase the strength of the lead paste, improve the performance and life of the battery, and on the other hand, it can improve the conductivity of the negative plate, inhibit the sulfation of the negative electrode, prevent the increase of the floating charge current and the water loss caused by excessive hydrogen evolution. At the same time, a catalyst is provided at a position in the battery case close to the gas discharge valve, which can further reduce the water loss of the battery. By providing an anti-corrosion coating on the surfaces of the above-mentioned terminal post and the bus bar, providing an annular groove on the surface of the terminal post, and providing a seal between the terminal post and the battery case, the acid creep and corrosion of the electrolyte can be reduced.

[0044] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of a battery provided by an embodiment of the present invention. The battery may include:

[0045] a plate group assembly 10, a bus bar 50, a terminal post 40, an electrolyte, and a battery case 20 for containing the plate group assembly 10, the bus bar 50, the terminal post 40, and the electrolyte;

[0046] One end of the bus bar 50 is connected to the plate group assembly 10, the other end of the bus bar 50 is connected to the terminal post 40, and a plurality of annular grooves are axially provided on the outer circumferential surface of the terminal post 40. An anti-corrosion layer 41 is provided on the outer circumferential surface of the terminal post 40, on the surface of the bus bar 50 adjacent to the terminal post 40, and on the outer circumferential surface of the bus bar 50;

[0047] The battery case 20 is provided with a terminal post hole for fixing the terminal post 40. For the part of the terminal post 40 extending into the terminal post hole, a sealing rubber ring, a sealing ring, a gasket nut, and a color glue are sequentially filled in the direction pointing to the outside of the battery case 20;

[0048] The electrode group assembly 10 includes positive plates 70 and negative plates 60 arranged alternately, and a separator 80 disposed between the positive plates 70 and the negative plates 60. The positive plate 70 includes a positive plate grid 72 and positive active material paste 71 cured at the positive plate grid 72. The negative plate 60 includes a negative plate grid and negative active material paste cured at the negative plate grid. Before curing and drying, by weight, the preparation raw materials of the positive active material paste 71 include 1000 parts of lead powder, 100 - 106 parts of dilute sulfuric acid, 0.6 part of short fiber, 90 - 120 parts of pure water, and 12 parts of tribasic lead sulfate. Before curing and drying, by weight, the preparation raw materials of the negative active material paste include 1000 parts of lead powder, 94 - 100 parts of dilute sulfuric acid, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber, and 90 - 120 parts of pure water;

[0049] The battery housing 20 is provided with a gas discharge valve 30, and a catalyst for catalyzing the reaction of hydrogen and oxygen to generate water is disposed at a position in the battery housing 20 close to the gas discharge valve 30.

[0050] It should be noted that this embodiment can be correspondingly referred to Figure 3 , Figure 3Schematic diagram of the structure for fixing the electrode group assembly, bus bar and pole in a storage battery provided by an embodiment of the present invention. Specifically, in this embodiment, the components in the positive electrode paste 71 can meet the following conditions: the oxidation degree of the lead powder is between 70% and 77%, the density of the dilute sulfuric acid is 1.40 g / ml, the short fiber is polyester short fiber or polypropylene short fiber, the conductivity of the pure water is less than or equal to 2 μS / cm, the content of tribasic lead sulfate is greater than 90%, and the apparent density of the prepared positive electrode paste 71 is between 4.1 - 4.3 g / cm³. Correspondingly, the components in the negative electrode paste can meet the following conditions: the oxidation degree of the lead powder is between 70% and 77%, the density of the dilute sulfuric acid is 1.40 g / ml, the particle size of barium sulfate is between 0.6 - 0.8 μm, the content of humic acid (dry basis) is greater than 85%, the particle size of lignin (through a 0.074 μm test sieve) is greater than 99%, the carbon content in the graphite is greater than 99.99%, the short fiber is polyester short fiber or polypropylene short fiber, the conductivity of the pure water is less than or equal to 2 μS / cm, and the apparent density of the prepared negative electrode paste is between 4.2 - 4.4 g / cm³. The aggregation and shrinkage of lead sulfate are inhibited by barium sulfate and other expanding agents; further, a graphite-containing coating is applied on the negative electrode. Graphite has excellent electrical conductivity, can reduce the interfacial resistance of the negative electrode plate, promote the rapid transfer of electrons, and thus improve the charge and discharge efficiency of the battery; the hydrophobicity of graphite can adjust the wettability of the electrolyte on the surface of the electrode plate, ensure the uniform distribution of the electrolyte, and avoid the occurrence of shrinkage cracks due to uneven local reactions caused by rapid reactions at high temperatures. Through the above settings, the shrinkage of the negative electrode active material can be avoided. In this embodiment, the ratio of the positive electrode active material to the negative electrode active material in the electrode group assembly 10 can be further set to be between 1.7 and 1.8. In this embodiment, taking the positive electrode paste 71 as an example, reference can be made to Figure 4 , Figure 4 Schematic diagram of the front view and side view combined structure of the positive electrode plate in a storage battery provided by an embodiment of the present invention. In this embodiment, the catalyst placement area 1 can be as Figure 2 shown in

[0051] Preferably, the separator 80 provided in this embodiment can include one or more of organic fibers, basalt mineral fibers, and water-soluble polyvinyl alcohol fibers.

[0052] Preferably, the separator 80 can be set to include basalt mineral fibers and water-soluble polyvinyl alcohol fibers at the same time. The basalt mineral fibers have good thermal stability and can maintain stable performance in high-temperature environments, preventing the performance degradation of the separator at high temperatures. The polyvinyl alcohol fibers have relatively high mechanical strength and can enhance the overall strength of the separator, making it not easily damaged during the operation of the battery. Further, organic fibers can be added to the separator 80, which can further improve the mechanical strength and chemical stability of the separator 80, enabling the separator 80 to better resist physical deformation and chemical corrosion during the charge and discharge process of the battery, extending the service life of the battery. In addition, the organic fibers can also improve the liquid absorption performance of the separator 80 and increase the storage capacity of the electrolyte, thereby improving the discharge capacity and efficiency of the battery. By adding the above substances to the separator 80, the separator 80 can have a relatively high basis weight, air permeability, and puncture resistance, meet the requirement that the electrode group assembly 10 maintains a tightly assembled state, reduce the resistance of oxygen permeating through the separator 80 to the negative electrode plate 60, reduce the floating charge current, and more effectively solve the problems of increased floating charge current under high-temperature conditions, the decrease in the assembly pressure of the lead-acid battery electrode group assembly 10 caused by the degradation of the separator 80 at high temperatures, and the short circuit problem caused by the growth of dendrites on the high-temperature electrode plates piercing the separator 80 for a long time. In this embodiment, the storage battery is a lead-acid battery, and the terminal post 40 can be set to have a structure of a copper core with a lead sleeve outside.

[0053] In this embodiment, the above-mentioned negative electrode plate 60, separator 80, and positive electrode plate 70 can be fixed by casting welding. At the same time, the electrode group assembly 10 and the bus bar 50 can be fixed together during casting welding, and the bus bar 50 and the terminal post 40 can be welded together at the same time. The specific structure of the battery case 20 is not limited in this embodiment. For the convenience of installation, the battery case 20 can be set to include a battery cell and a battery cover, and the battery cell and the battery cover are snap-fitted. The gas exhaust valve 30 can be arranged in the battery cover.

[0054] Further, in order to ensure the uniform density of the positive electrode paste 71 and reduce the crystal nucleus size of the positive electrode paste 71, it can be set that the ratio of tribasic lead sulfate in the positive electrode paste 71 cured at the positive electrode grid 72 to the mass of the positive electrode paste 71 is 0.5% - 1%.

[0055] In this embodiment, in the positive electrode paste 71, the mass proportion of tribasic lead sulfate is 0.5%-1%. It should be noted that if the mass proportion of tribasic lead sulfate is too low, the PbO2 crystal grains after formation will be small, the initial capacity will be high but the cycle life will be short; if the mass proportion of tribasic lead sulfate is too high, the crystals will grow excessively, resulting in too high density of the paste, difficult penetration of the electrolyte, increased internal resistance, incomplete formation easily occurring, and the problem of reduced utilization rate of the active material. Therefore, applying tribasic lead sulfate within the mass proportion range in this embodiment can form an active material with tribasic lead sulfate as the framework, increase the binding force of the active material, improve the charge and discharge performance, ensure the functionality of the positive electrode paste 71, and reduce the crystal nucleus size in the positive electrode paste 71.

[0056] Further, in order to improve the catalytic effect of the catalyst on hydrogen and oxygen, a catalyst placement cavity can be provided inside the battery housing 20. One end of the catalyst placement cavity is in communication with the inside of the battery housing 20, and the other end of the catalyst placement cavity is in communication connection with the gas discharge valve 30;

[0057] The catalyst is placed in the catalyst placement cavity.

[0058] In this embodiment, by providing one end of the catalyst placement cavity in communication with the inside of the battery housing 20 and the other end of the catalyst placement cavity in communication connection with the gas discharge valve 30, it can be ensured that the gas generated during the operation of the battery first flows through the catalyst placement cavity, where oxygen and hydrogen combine to form water under the action of the catalyst and return to the electrolyte. The gas still present at this time can be discharged through the gas discharge valve 30. In this embodiment, the catalyst placement cavity is arranged on the flow path where the gas overflows from the battery housing 20, which can give full play to the catalytic effect of the catalyst, thereby reducing the water loss in the electrolyte.

[0059] Further, to solve the problem that the corrosion rate of the electrode group assembly 10 increases due to the increase in the concentration of the electrolyte caused by water loss, reference can be made to Figure 5 , Figure 5 FIG. is a schematic structural diagram of a positive electrode grid in a storage battery provided by an embodiment of the present invention. In this embodiment, it can be provided that the above positive electrode grid 72 and the negative electrode grid both include a frame 91 and ribs 92 arranged in a grid shape inside the frame 91;

[0060] Both the frame 91 and the ribs 92 include a crystal nucleating agent.

[0061] It should be noted that taking the positive plate grid 72 as an example, in this embodiment, by adding a crystal nucleating agent to the above-mentioned frame 91 and rib 92, the corrosion resistance of the frame 91 and rib 92 can be enhanced. In a feasible embodiment, the above-mentioned frame 91 and rib 92 can be set to a structure including at least one of the materials of lead, calcium, tin, aluminum, silver, bismuth, antimony, copper, nickel, and magnesium. For example, in a lead-acid battery, both the frame 91 and rib 92 include tin and calcium. At this time, increasing the content of tin and decreasing the content of calcium can both enhance the corrosion resistance of the positive plate grid 72 and the negative plate grid.

[0062] Furthermore, in order to improve the stability of the battery during operation at high temperatures and avoid the problem that the internal temperature of the battery further increases due to the bulging of the battery case 20, it can be set that the above-mentioned battery case 20 is formed by blending acrylonitrile-butadiene-styrene copolymer, liquid crystal polymer, and polyphthalamide.

[0063] In this embodiment, PC-ABS is a material that combines the advantages of PC (polycarbonate) and ABS (acrylonitrile-butadiene-styrene copolymer), and has good impact strength, dimensional stability, and processing performance. LCP has excellent fluidity. PPA is a high-temperature nylon with heat resistance, chemical resistance, and mechanical strength. For example, adding LCP to PC-ABS can improve the fluidity and molding processing performance of the material, and adding PPA can further enhance the heat resistance and chemical resistance of the composite material. That is, in a feasible embodiment, the battery case 20 can be set to be prepared by blending PC-ABS, LCP, and PPA.

[0064] Furthermore, in order to avoid the problem that the corrosion resistance effect of the terminal post 40 and the bus bar 50 is reduced due to the loss of electrolyte water caused by temperature rise, a vulcanized rubber sleeve can be provided on the outer circumferential surface of the above-mentioned terminal post 40, on the side of the annular groove close to the bus bar 50. Epoxy resin sealant is provided on the surface of the outer circumferential surface of the terminal post 40 on the side of the vulcanized rubber sleeve close to the bus bar 50, on the surface of the bus bar 50 close to the terminal post 40, and on the outer circumferential surface of the bus bar 50;

[0065] The vulcanized rubber sleeve and the epoxy resin sealant combine to form an anti-corrosion layer 41.

[0066] It should be noted that the vulcanized rubber sleeve provided in this embodiment has good mechanical strength and wear resistance. And epoxy resin sealant is provided on the surface of the outer circumferential surface of the terminal post 40 on the side of the vulcanized rubber sleeve close to the bus bar 50, which can ensure firm bonding with the terminal post 40, is not prone to loosening or falling off, and at the same time ensure stability in a high-temperature environment, avoid electrolyte acid creep, and thus improve the corrosion resistance of the terminal post 40.

[0067] Further, in order to further reduce the impact of high temperature on the working performance of the storage battery, epoxy resin sealant can be provided at the area where the bus bar 50 contacts the pole group assembly 10 on the side facing the pole group assembly 10.

[0068] It should be noted that in this embodiment, the side of the bus bar 50 facing the pole group assembly 10 is conductively connected to the positive plate 70 or the negative plate 60 of the pole group assembly 10. In one embodiment, the bus bar 50 has a plurality of convex structures, and there are gaps between adjacent convex structures. To prevent the electrolyte from corroding the surface of the bus bar 50 at these gaps, in this embodiment, epoxy resin sealant is provided at the area where the bus bar 50 contacts the pole group assembly 10 on the side facing the pole group assembly 10, so as to further improve the corrosion resistance of the bus bar 50.

[0069] Further, in order to prevent the electrolyte from creeping and corroding the terminal post 40 and the battery case 20, in this embodiment, a plurality of annular convex structures or annular concave structures can be provided axially on the outer circumferential surface of the terminal post 40 corresponding to the location where the epoxy resin sealant is provided.

[0070] It should be noted that in this embodiment, by providing annular convex structures or annular concave structures on the outer circumferential surface of the terminal post 40 corresponding to the location where the epoxy resin sealant is provided, the creeping path of the electrolyte on the surface of the terminal post 40 can be extended, further preventing the electrolyte from damaging and corroding the terminal post 40. Preferably, in order to ensure the mechanical strength of the terminal post 40 at the same time and avoid structural damage to the terminal post 40 caused by etched grooves, a plurality of annular convex structures can be provided axially on the outer circumferential surface of the terminal post 40 corresponding to the location where the epoxy resin sealant is provided, ensuring the structural stability of the terminal post 40 while reducing the creeping of the electrolyte.

[0071] Further, in order to improve the charging efficiency of the storage battery and avoid the problem of heat accumulation during the operation of the storage battery, an electrolyte containing magnesium sulfate heptahydrate crystals can be attached to the pole group assembly 10, and the crystal particles of the magnesium sulfate heptahydrate crystals are 0.1 mm to 1 mm, and the ratio of the crystal particles to the mass of the electrolyte is 1% - 3%.

[0072] In this embodiment, an electrolyte is attached to the pole group assembly 10, and the electrolyte includes magnesium sulfate heptahydrate crystals with crystal particles of 0.1 mm to 1 mm and a ratio of the crystal particles to the mass of the electrolyte of 1% - 3%. This can improve the charging efficiency of the storage battery on the basis of meeting the battery capacity, improve the conductivity, and solve the problems of long charging time and heat accumulation in the storage battery. With a certain proportion of magnesium sulfate heptahydrate by mass in the electrolyte, during the charging process, the smaller the crystal particles, the more conducive it is for the crystals to quickly pass through the micropores of the separator and quickly combine with sulfate ions, slowing down the formation of large particles of lead sulfate and preventing the blockage of the micropores of the separator, which would otherwise lead to a reduction in charging efficiency.

[0073] Applying the storage battery provided by the embodiment of the present invention, it includes a plate group assembly 10, a bus bar 50, a terminal post 40 and electrolyte, as well as a battery case 20 for containing the plate group assembly 10, the bus bar 50, the terminal post 40 and the electrolyte; one end of the bus bar 50 is connected to the plate group assembly 10, the other end of the bus bar 50 is connected to the terminal post 40, and several annular grooves are axially arranged on the outer circumferential surface of the terminal post 40. On the outer circumferential surface of the terminal post 40, the surface of the bus bar 50 close to the terminal post 40, and the outer circumferential surface of the bus bar 50 are all provided with an anti-corrosion layer 41; the battery case 20 is provided with a terminal post hole for fixing the terminal post 40. For the part of the terminal post 40 extending into the terminal post hole, a sealing rubber ring, a sealing ring, a gasket nut and a color glue are sequentially filled in the direction pointing to the outside of the battery case 20; the plate group assembly 10 includes alternately arranged positive plates 70 and negative plates 60, and a separator 80 arranged between the positive plates 70 and the negative plates 60. The positive plate 70 includes a positive plate grid 72 and positive paste 71 solidified at the positive plate grid 72. The negative plate 60 includes a negative plate grid and negative paste solidified at the negative plate grid; before solidification and drying, by weight, the preparation raw materials of the positive paste 71 include 1000 parts of lead powder, 100-106 parts of dilute sulfuric acid, 0.6 part of short fiber, 90-120 parts of pure water and 12 parts of tribasic lead sulfate. Before solidification and drying, by weight, the preparation raw materials of the negative paste include 1000 parts of lead powder, 94-100 parts of dilute sulfuric acid, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber and 90-120 parts of pure water; the battery case 20 is provided with a gas discharge valve 30, and a catalyst for catalyzing the reaction of hydrogen and oxygen to generate water is arranged at a position in the battery case 20 close to the gas discharge valve 30. By setting the positive paste 71 and the negative paste before solidification and drying according to the above specific components, on the one hand, for the positive plate 70, it can reduce the uniform density of the paste particles, reduce the crystal nucleus size, increase the porosity of the paste, improve the conductivity of the positive plate 70, increase the paste strength, improve the performance and service life of the storage battery. On the other hand, it can improve the conductivity of the negative plate 60, inhibit negative plate sulfation, prevent the increase of floating charge current and water loss caused by excessive hydrogen evolution, avoid the shrinkage of negative active substances at high temperature. At the same time, by arranging a catalyst at a position in the battery case 20 close to the gas discharge valve 30, it can further reduce the water loss of the battery. By arranging an anti-corrosion layer 41 on the surfaces of the above-mentioned terminal post 40 and the bus bar 50, arranging annular grooves on the surface of the terminal post 40, and arranging the seal between the terminal post 40 and the battery case 20, it can reduce the acid creep and corrosion of the electrolyte.

[0074] In addition, in the embodiment of the present invention, by setting the mass ratio of tribasic lead sulfate in the positive electrode paste 71 to be 0.5%-1%, the functionality of the positive electrode paste 71 is ensured, and the crystal nucleus size in the positive electrode paste 71 is reduced; by setting one end of the catalyst placement cavity to be in communication with the inside of the battery case 20 and setting the other end of the catalyst placement cavity to be in communication connection with the gas discharge valve 30, the catalytic effect of the catalyst can be improved, thereby reducing the water loss in the electrolyte; by adding a crystal nucleating agent in the above-mentioned frame 91 and rib 92, the corrosion resistance of the frame 91 and rib 92 can be enhanced; setting the battery case 20 to be formed by blending acrylonitrile-butadiene-styrene copolymer, liquid crystal polymer and polyphthalamide can improve the stability of the storage battery when working at high temperature and prevent the battery case 20 from bulging; setting the combination of the vulcanized rubber sleeve and the epoxy resin sealant to form the anti-corrosion layer 41 can ensure good mechanical strength and wear resistance on the side in contact with the battery case 20, and at the same time ensure the firm combination of the side in contact with the bus bar 50 and the terminal post 40, which is not easy to loosen or fall off, ensuring stability in a high-temperature environment, preventing the electrolyte from creeping acid, and thus improving the corrosion resistance of the terminal post 40; by setting epoxy resin sealant at the area where the bus bar 50 contacts the battery stack assembly 10 on the side facing the battery stack assembly 10, the corrosion resistance of the bus bar 50 can be further improved; by setting a ring-shaped protrusion structure or a ring-shaped depression structure at the position corresponding to the epoxy resin sealant on the outer circumference of the terminal post 40, the creeping acid path of the electrolyte on the surface of the terminal post 40 can be extended, further preventing the electrolyte from damaging and corroding the terminal post 40; by setting the electrolyte to adhere to the battery stack assembly 10, and the electrolyte includes magnesium sulfate heptahydrate crystals with a crystal particle size of 0.1 mm to 1 mm and a ratio of the mass of the crystals to the mass of the electrolyte of 1%-3%, the charging efficiency of the storage battery can be improved on the basis of meeting the battery capacity of the storage battery, the electrical conductivity can be improved, and the problems of long charging time and heat accumulation in the storage battery can be solved.

[0075] Next, a method for preparing a storage battery provided by an embodiment of the present invention will be introduced. The method for preparing a storage battery described below is used to prepare the storage battery as described above, and can be mutually referred to with the storage battery described above.

[0076] Specifically, please refer to Figure 6 , Figure 6 which is a flowchart of a method for preparing a storage battery provided by an embodiment of the present invention, and may include:

[0077] S101: By weight, mix the raw materials including 1000 parts of lead powder, 0.6 part of short fiber and 12 parts of tribasic lead sulfate, add water to the mixture after dry mixing according to the water addition ratio of 90 - 120 parts of pure water, and perform wet mixing operation. Then, add acid to the mixture after wet mixing according to the acid addition ratio of 100 - 106 parts of dilute sulfuric acid, and discharge the paste after stirring to make the positive lead paste; by weight, mix the raw materials including 1000 parts of lead powder, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber, add water to the mixture after dry mixing according to the water addition ratio of 90 - 120 parts of pure water, and perform wet mixing operation. Then, add acid to the mixture after wet mixing according to the acid addition ratio of 94 - 100 parts of dilute sulfuric acid, and discharge the paste after stirring to make the negative lead paste.

[0078] Specifically, in this embodiment, the operation time of the dry mixing process is 10 minutes to 15 minutes. During the wet mixing process, it is necessary to keep stirring at a constant speed while adding water, and finely adjust the stirring rate and water addition amount according to the density of the paste being stirred. The operation time of this wet mixing process is 5 minutes, and the operation of adding water during this wet mixing process needs to be completed within 1 minute to 2 minutes. Further, when performing the acid addition operation during the above paste mixing process, the temperature is not higher than 70°C, and the operation temperature during the paste discharging process after stirring is not higher than 48°C.

[0079] S102: Uniformly coat the positive lead paste on the positive plate grid to prepare a positive plate preform, and uniformly coat the negative lead paste on the negative plate grid to prepare a negative plate preform; dry the positive plate preform at a temperature of 75 - 85°C to obtain the dried positive plate, and dry the negative plate preform at a temperature of 65 - 75°C to obtain the dried negative plate.

[0080] In this embodiment, preferably, the drying treatment temperature of the positive plate can be set to 85°C, and the drying treatment temperature of the negative plate can be set to 75°C.

[0081] S103: Arrange the positive plates and negative plates alternately, set a separator between adjacent positive and negative plates, and connect and fix the positive plate, separator, and negative plate in sequence, and correspondingly connect the bus bar and the electrode post, and install them in the battery case in cooperation with the electrolyte.

[0082] In a feasible embodiment, the preparation process of the storage battery may include the following steps:

[0083] Step S11: Set a vulcanized rubber sleeve on the side of the annular groove provided on the outer circumferential surface of the electrode post close to the bus bar;

[0084] Step S12: Weld the processed electrode post to the bus bar during the casting and welding process of the electrode group assembly;

[0085] Step S13: Wipe the surfaces of the pole post and the bus bar processed in the above steps clean with an alcohol swab;

[0086] Step S14: Dip a brush into the prepared epoxy resin sealant and evenly apply a layer of epoxy resin sealant coating along the outer circumferential surface of the pole post at the side surface of the vulcanized rubber sleeve close to the bus bar, the surface of the bus bar close to the pole post, and the outer circumferential surface of the bus bar;

[0087] Step S15: Perform a drying and curing treatment on the battery plate group assembly, the bus bar connected to the battery plate group assembly, and the pole post welded to the bus bar to reduce the fluidity of the epoxy resin sealant;

[0088] Step S16: Perform a sealing treatment on the battery plate group assembly, the bus bar, and the pole post processed in the above steps. The pole post extends into the pole post hole opened in the battery cover. Then, at the space between the pole post and the inner wall of the pole post hole, sequentially install a sealing rubber ring, a sealing ring, and a gasket nut along the direction pointing to the outside of the battery cover. After the gasket nut is tightly fitted with the sealing thread provided on the inner wall of the pole post hole, fill the space of the gasket nut close to the outside with the prepared color glue until the color glue is flush with the outer surface of the battery cover.

[0089] In this embodiment, the above-mentioned anti-corrosion pole post sealing structure is provided to completely seal the contact interface of the overall sealing structure between the battery cover and the pole post, reducing the possibility of sulfuric acid electrolyte climbing within the contact interface. At the same time, the color glue filled into the upper space of the gasket nut is pure color glue, and the process operation is simple and efficient.

[0090] Applying the battery preparation method provided by the embodiments of the present invention, it includes S101. By weight, mix the raw materials including 1000 parts of lead powder, 0.6 part of short fiber, and 12 parts of tribasic lead sulfate. Add water to the mixture after dry stirring according to the water addition ratio of 90 - 120 parts of pure water, and perform wet stirring operation. Then add acid to the mixture after wet stirring according to the acid addition ratio of 100 - 106 parts of dilute sulfuric acid, and discharge the paste after stirring to make the positive electrode lead paste. By weight, mix the raw materials including 1000 parts of lead powder, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, and 0.8 part of short fiber. Add water to the mixture after dry stirring according to the water addition ratio of 90 - 120 parts of pure water, and perform wet stirring operation. Then add acid to the mixture after wet stirring according to the acid addition ratio of 94 - 100 parts of dilute sulfuric acid, and discharge the paste after stirring to make the negative electrode lead paste. S102, uniformly coat the positive electrode lead paste on the positive electrode grid to prepare a positive electrode preform, and uniformly coat the negative electrode lead paste on the negative electrode grid to prepare a negative electrode preform. Dry the positive electrode preform at a temperature of 75 - 85 °C to obtain the dried positive electrode plate, and dry the negative electrode preform at a temperature of 65 - 75 °C to obtain the dried negative electrode plate. S103, alternately arrange the positive electrode plates and the negative electrode plates, set a separator between adjacent positive electrode plates and negative electrode plates, and sequentially connect and fix the positive electrode plate, the separator, and the negative electrode plate, and correspondingly connect the bus bar and the pole column, and install them in the battery case in cooperation with the electrolyte. By setting the positive electrode lead paste and the negative electrode lead paste before curing and drying according to the above specific components, on the one hand, for the positive electrode plate, it can reduce the uniform density of the lead paste particles, reduce the crystal nucleus size, increase the porosity of the lead paste, improve the conductivity of the positive electrode plate, increase the strength of the lead paste, and improve the performance and lifespan of the battery. On the other hand, it can improve the conductivity of the negative electrode plate, inhibit negative electrode sulfation, prevent the increase of floating charge current and water loss caused by excessive hydrogen evolution, avoid the shrinkage of the negative electrode active material at high temperature. At the same time, set a catalyst at the position in the battery case close to the gas discharge valve, which can further reduce the water loss of the battery. By setting an anti-corrosion layer on the surfaces of the above-mentioned pole column and bus bar, setting an annular groove on the surface of the pole column, and setting the seal between the pole column and the battery case, it can reduce the acid creep and corrosion of the electrolyte.

[0091] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0092] In addition, it should be noted that in this text, relationships such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0093] The above has introduced in detail a storage battery and a method for preparing the storage battery provided by the present invention. Specific examples are used in this text to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A storage battery, characterized in that, Comprising: a battery cell assembly, a bus bar, a terminal post, and an electrolyte, as well as a battery case for containing the battery cell assembly, the bus bar, the terminal post, and the electrolyte; one end of the bus bar is connected to the battery cell assembly, the other end of the bus bar is connected to the terminal post, and a plurality of annular grooves are axially arranged on the outer circumferential surface of the terminal post. An anticorrosive layer is provided on the outer circumferential surface of the terminal post, on the surface of the bus bar adjacent to the terminal post, and on the outer circumferential surface of the bus bar; the battery case is provided with a terminal post hole for fixing the terminal post. For the part of the terminal post extending into the terminal post hole, a sealing rubber ring, a sealing ring, a gasket nut, and a color glue are sequentially filled in the direction pointing to the outside of the battery case; the battery cell assembly includes alternately arranged positive plates and negative plates, and a separator disposed between the positive plates and the negative plates. The positive plate includes a positive plate grid and positive lead paste cured at the positive plate grid. The negative plate includes a negative plate grid and negative lead paste cured at the negative plate grid. Before curing and drying, by weight, the preparation raw materials of the positive lead paste include 1000 parts of lead powder, 100 - 106 parts of dilute sulfuric acid, 0.6 part of short fiber, 90 - 120 parts of pure water, and 12 parts of tribasic lead sulfate. Before curing and drying, by weight, the preparation raw materials of the negative lead paste include 1000 parts of lead powder, 94 - 100 parts of dilute sulfuric acid, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber, and 90 - 120 parts of pure water; the battery case is provided with a gas discharge valve, and a catalyst for catalyzing the reaction of hydrogen and oxygen to generate water is provided at a position in the battery case adjacent to the gas discharge valve; 2. The storage battery according to claim 1, characterized in that, in the positive lead paste cured at the positive plate grid, the ratio of tribasic lead sulfate to the mass of the positive lead paste is 0.5% - 1%; 3. The storage battery according to claim 1, characterized in that, a catalyst placement cavity is provided inside the battery case. One end of the catalyst placement cavity is in communication with the inside of the battery case, and the other end of the catalyst placement cavity is in communication with the gas discharge valve; the catalyst is placed in the catalyst placement cavity; 4. The storage battery according to claim 1, characterized in that, both the positive plate grid and the negative plate grid include a frame and ribs arranged in a grid shape inside the frame; both the frame and the ribs include a crystal nucleating agent; 5. The storage battery according to claim 1, wherein, the battery case is formed by blending acrylonitrile - butadiene - styrene copolymer, liquid crystal polymer, and polyphthalamide; 6. The storage battery according to claim 1, characterized in that, on the outer circumferential surface of the terminal post, a vulcanized rubber sleeve is provided on the side of the annular groove adjacent to the bus bar. An epoxy resin sealant is provided on the surface of the outer circumferential surface of the terminal post on the side of the vulcanized rubber sleeve adjacent to the bus bar, on the surface of the bus bar adjacent to the terminal post, and on the outer circumferential surface of the bus bar; the vulcanized rubber sleeve and the epoxy resin sealant together form the anticorrosive layer; 7. The storage battery according to claim 6, characterized in that, on the side of the bus bar adjacent to the battery cell assembly, an epoxy resin sealant is provided at the area in contact with the battery cell assembly.

8. The storage battery according to claim 6, wherein, On the outer circumferential surface of the terminal post corresponding to the position where the epoxy resin sealant is provided, a plurality of annular convex structures or annular concave structures are axially provided.

9. The storage battery according to claim 1, characterized in that, The electrolyte containing crystalline magnesium sulfate heptahydrate is attached to the electrode group assembly, and the crystal particles of the crystalline magnesium sulfate heptahydrate are 0.1 mm to 1 mm, and the ratio of the mass of the electrolyte is 1% - 3%.

10. A method for preparing a storage battery, characterized in that, For preparing the storage battery according to any one of claims 1 to 9, comprising: By weight, mix the raw materials including 1000 parts of lead powder, 0.6 part of short fiber and 12 parts of tribasic lead sulfate, add water to the mixture after dry stirring according to the water addition ratio of 90 - 120 parts of pure water, and perform wet stirring operation, then add acid to the mixture after wet stirring according to the acid addition ratio of 100 - 106 parts of dilute sulfuric acid, and discharge the paste after stirring to make the positive electrode lead paste; By weight, mix the raw materials including 1000 parts of lead powder, 8.2 parts of barium sulfate, 2 parts of humic acid, 1.6 parts of lignin, 4 parts of graphite, 0.8 part of short fiber, add water to the mixture after dry stirring according to the water addition ratio of 90 - 120 parts of pure water, and perform wet stirring operation, then add acid to the mixture after wet stirring according to the acid addition ratio of 94 - 100 parts of dilute sulfuric acid, and discharge the paste after stirring to make the negative electrode lead paste; Uniformly coat the positive electrode lead paste on the positive electrode grid to prepare a positive electrode plate preform, and uniformly coat the negative electrode lead paste on the negative electrode grid to prepare a negative electrode plate preform; Dry the positive electrode plate preform at a temperature of 75 - 85 °C to obtain a dried positive electrode plate, and dry the negative electrode plate preform at a temperature of 65 - 75 °C to obtain a dried negative electrode plate; Arrange the positive electrode plates and the negative electrode plates alternately, arrange a separator between adjacent positive electrode plates and negative electrode plates, and connect and fix the positive electrode plates, the separator, and the negative electrode plates in sequence, and correspondingly connect the bus bar and the terminal post, and install them in the battery case in cooperation with the electrolyte.

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