A manufacturing process for a flooded auxiliary battery with high charge acceptance performance and a flooded auxiliary battery

Abstract

The invention provides a manufacturing process for a flooded auxiliary battery with high charge acceptance performance and a flooded auxiliary battery. The positive electrode lead paste is prepared by comprising a positive electrode lead paste formula comprising the following components in parts by weight: 100 parts of lead powder, 5-9 parts of dilute sulfuric acid, 9-13 parts of deionized water, 0.06-0.12 parts of antimony trioxide, 0.2-0.6 parts of sodium peroxide as an oxygen enhancer, and 0.06-0.12 parts of ultrashort fibers. The negative electrode lead paste is prepared by comprising a negative electrode lead paste formula comprising the following components in parts by weight: 100 parts of lead powder, 6-11 parts of dilute sulfuric acid, 8-13 parts of deionized water, 0.06-0.10 parts of ultrashort fibers, 0.2-0.4 parts of an LN-01 composite additive, 0.5-1.1 parts of ultrafine barium sulfate, and 0.1-0.3 parts of Norwegian lignin. 10%-20% of a high-conductivity composite electrolyte additive is added to a dilute sulfuric acid electrolyte in a primary acid addition process of battery formation. The flooded auxiliary battery produced by this manufacturing process has good low-voltage and deep-discharge charging acceptance performance, meeting the working conditions of deep discharge and rapid recharging of new energy vehicles.

Description

Technical Field

[0001] The invention relates to a manufacturing process of a flooded auxiliary battery. Background Art

[0002] With the development of new energy vehicles, traditional cars are integrating with the internet and artificial intelligence. Smart cars are no longer simply transportation in the traditional sense, but have evolved into service systems and ecosystem platforms. Intelligent driving technologies such as automated parking, autonomous driving, and autonomous vehicle judgment significantly improve safety and comfort, providing users with a better driving experience. Intelligent vehicle connectivity connects cars to the internet, enabling remote control, intelligent navigation, voice interaction, online entertainment, and other services, providing users with a more intelligent driving experience.

[0003] With the continuous upgrade of new energy vehicles, 12V low-voltage auxiliary batteries, in addition to conventional power requirements, must also meet new functional demands brought about by intelligent, safe, and autonomous driving. These include power supply for remote monitoring and OTA upgrades, auxiliary braking and power steering, safe energy supply when the main battery fails, auxiliary safe driving functions, driving and parking prediction, dynamic voltage regulation, and so on. High intelligence, in-vehicle Internet technology, and safe autonomous driving technology are the inevitable trends in the future development of new energy vehicles, placing higher demands on low-voltage auxiliary batteries.

[0004] New energy vehicle application conditions and current problems:

[0005] 1. Low DC-DC conversion charging voltage: Considering the range of new energy vehicles, some OEMs will reduce the DC-DC conversion charging voltage. At the same time, in addition to commercial vehicles, EV new energy vehicles are mainly used for short-term driving in the city, with short charging time. The auxiliary battery is undercharged for a long time, resulting in power loss.

[0006] 2. High power consumption and slow charging recovery: New energy vehicles have high dark current and electrical power consumption. Conventional low-voltage batteries have poor deep discharge charging recovery and require long charging times. This shortens the service life of the low-voltage battery and consumes more high-voltage power, affecting the range.

[0007] Therefore, new energy vehicles have higher requirements on the low-voltage charging acceptance performance and deep discharge charging recovery performance of auxiliary batteries, and there is an urgent need to carry out applicability development to meet the development needs of new energy vehicles. Summary of the Invention

[0008] Based on the above background, the present invention provides a manufacturing process for a flooded auxiliary battery with high charge acceptance performance to solve the problem of poor low-voltage and deep-discharge charge acceptance performance of existing flooded batteries.

[0009] The technical solution of the present invention is: a manufacturing process of a flooded auxiliary battery with high charge acceptance performance, characterized by comprising the following steps:

[0010] Preparation of positive electrode lead paste:

[0011] The positive electrode lead paste formula contains the following components in parts by weight:

[0012]

[0013] The oxygen promoter is used to release oxygen during the plate curing process to form an oxidized corrosion layer at the grid interface;

[0014] Preparation of negative electrode lead paste:

[0015] The negative electrode lead paste formula contains the following components in parts by weight:

[0016]

[0017] Plate preparation: The lead paste is transferred to a paste coating hopper and evenly coated on the surface of the grid strip by a paste coating machine. The grid strip is then cut into individual wet plates. The individual wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber. They are cured and dried into dry plates through a curing and drying process.

[0018] Pole group encapsulation: using separator to encapsulate negative electrode;

[0019] Battery assembly: Immerse the ends of the encapsulated and assembled electrode group ears into a mold filled with molten lead, quickly cast-weld the positive and negative plate ears in parallel, then install the welded electrode groups into the battery tank, weld the adjacent connectors together, and distribute them into the individual cells of the battery tank. Use the butt welding process to butt-weld the electrode groups, and then heat-seal the cover;

[0020] Battery formation: A dilute sulfuric acid solution is used for primary acid addition. 10% to 20% of a high-conductivity composite electrolyte additive is added to the dilute sulfuric acid electrolyte for primary acid addition. The composition and weight ratio of the high-conductivity composite electrolyte additive are lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = (1±0.1): (3±0.2): (2±0.2): (5±0.3): (8±0.5). An intermittent constant current charging formation process is used for charging and formation. After the formation is completed, a non-reversing acid process is used. Only a small amount of acid is added to each cell of the battery tank for a second time to adjust the liquid level. At the same time, the electrolyte mixed acid density is ensured to be 1.280±0.005g / cm 3 .

[0021] The paste-making process of the positive electrode lead paste is as follows:

[0022] 1) Weigh the raw materials according to the weight of the positive electrode formula; dry-mix sodium peroxide, antimony trioxide, ultra-short fibers, and lead powder, add deionized water (25-35% by weight) for 1-2 minutes, and stir for 2-4 minutes;

[0023] 2) Add the remaining deionized water, control the water addition time to 3-4 minutes, and continue stirring for 3-6 minutes;

[0024] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time should be controlled within 7 to 10 minutes;

[0025] 4) Finally, open the cooling system, continue stirring, and cool down to 50±3°C to obtain the positive electrode lead paste.

[0026] The paste preparation process of the negative electrode lead paste is as follows:

[0027] 1) Weigh the raw materials according to the weight of the negative electrode formula; stir and mix the LN-01 composite additive, ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder; add deionized water (25-35% by weight) over a period of 1.5-2.5 minutes and stir for 2-4 minutes;

[0028] 2) Add the remaining deionized water, control the water addition time to 3-4 minutes, and continue stirring for 5-10 minutes;

[0029] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time should be controlled within 7 to 10 minutes;

[0030] 4) Finally, open the cooling system, continue stirring, and cool down to 50±3°C to obtain the negative electrode lead paste.

[0031] The oxygen-promoting agent is sodium peroxide, and the particle size of the sodium peroxide crystals is 1.5-4 μm. The sodium peroxide crystals release oxygen during the plate curing process, which helps form an oxidized corrosion layer at the grid interface, reduces the grid interface resistance, and improves the charge acceptance.

[0032] The LN-01 composite additive is a composite crystal prepared by ball milling lead sulfate crystals and activated carbon in a weight ratio of (1±0.2):(1±0.2). The particle size of the composite crystal is 1.5-4.5 μm.

[0033] The separator is a PE separator.

[0034] The preparation method of the highly conductive composite electrolyte additive is as follows: the corresponding raw materials are weighed according to the following weight ratio: lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = (1±0.1): (3±0.2): (2±0.2): (5±0.3): (8±0.5), lithium sulfate, aluminum sulfate, germanium sulfate, and silicon dioxide are added to pure water according to the above ratios, and sheared using a high-speed shearing machine at room temperature. The high-speed shearing process parameters are 4000-6000rpm, 20-40min, and the preparation of the highly conductive composite electrolyte additive is completed; the composite electrolyte additive improves the degree of acid stratification under deep discharge conditions of the battery, and at the same time increases the activity of the electrolyte in a low-temperature environment, thereby improving the charge acceptance performance.

[0035] The battery formation process also includes heat sealing of the small cover after adjusting the liquid level, air tightness testing, and finally high current testing and battery cleaning and drying.

[0036] The specific method of welding adjacent connectors together during battery assembly is to apply a high current to the connectors of the positive and negative electrode groups using a through-wall welding fixture to partially melt the connectors and maintain pressure for 3-5 seconds.

[0037] Another aspect of the present invention provides a flooded auxiliary battery manufactured using the above-mentioned manufacturing process for a flooded auxiliary battery with high charge acceptance performance.

[0038] The beneficial effects of the present invention are as follows: the present invention adds an LN-01 composite additive (a composite crystal prepared by ball-milling lead sulfate crystals and activated carbon at a ratio of (1±0.2):(1±0.2)) to the negative electrode lead paste; the PbSO4 component in the crystal increases the pore size of the negative electrode, provides an enhanced ion transmission channel, and improves the rate performance of the negative electrode active material; at the same time, the use of a lead-containing substance to modify the carbon material improves the affinity between the additive and the negative electrode active material, solves the poor contact problem caused by the large density difference between lead and the carbon material, and improves the negative electrode charging recovery performance; adding 10% to 20% of the high-conductivity composite electrolyte additive to the dilute sulfuric acid electrolyte in the battery formation and acid charging process improves the degree of acid stratification under deep discharge conditions of the battery, and at the same time increases the activity of the electrolyte in a low-temperature environment, thereby improving the charge acceptance performance; the battery produced by the manufacturing process and the positive and negative electrode lead paste formula provided by the present invention has good low-voltage and deep discharge charging acceptance performance, has the characteristics of ultra-high charge acceptance performance, meets the working condition requirements of deep discharge and rapid recharging of new energy vehicles, and meets the use requirements of pure electric new energy vehicles. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of the present invention.

[0040] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus should be considered part of the authorization specification.

[0041] Example 1

[0042] A formula for a flooded auxiliary battery plate with high charge acceptance and an auxiliary battery manufacturing process, wherein the positive electrode lead paste formula comprises the following components in parts by weight:

[0043]

[0044] The positive electrode and paste process is:

[0045] 1) Dry-mix antimony trioxide, ultra-short fibers, and lead powder, add deionized water (25% by weight of the total deionized water), add water for 1.5 minutes, and stir for 3 minutes;

[0046] 2) Add the remaining deionized water for 3 minutes and continue stirring for 4 minutes;

[0047] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time should be controlled within 8 minutes;

[0048] 4) Finally, open the cooling system, continue stirring, and cool to 50°C to obtain the positive electrode lead paste;

[0049] The negative electrode lead paste formula contains the following ingredients in parts by weight:

[0050]

[0051] The negative electrode and paste process is:

[0052] 1) First, stir and mix the ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder, then add deionized water (25% by weight) for 2 minutes and stir for 3 minutes.

[0053] 2) Add the remaining deionized water for 3 minutes and continue stirring for 6 minutes;

[0054] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time should be controlled within 8 minutes;

[0055] 4) Finally, open the cooling system, continue stirring, and cool down to 50°C to obtain the negative electrode lead paste.

[0056] The lead paste is transferred to a paste coating hopper and evenly coated on the surface of the grid strip by a paste coating machine. The grid strip is then cut into individual wet plates. The individual wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber. They are cured and dried into dry plates through a curing and drying process.

[0057] The electrode group encapsulation uses PE separator to encapsulate the negative electrode;

[0058] The battery is assembled using a COS cast welding machine. The ends of the encapsulated and assembled electrode group lugs are immersed in a mold filled with molten lead. The positive and negative plate lugs are quickly cast-welded in parallel. The welded electrode groups are then installed in the battery tank. A high current is applied to the connectors of the positive and negative electrode groups using a through-wall welding machine fixture to partially melt the connectors. The pressure is maintained for 3 seconds, and the adjacent connectors are welded together. The batteries are then distributed and installed in the individual cells of the battery tank. The electrode groups are butt-welded using a butt welding process, and the cover is heat-sealed.

[0059] Battery formation: A dilute sulfuric acid solution is used for primary acid addition. 10% of a highly conductive composite electrolyte additive is added to the dilute sulfuric acid electrolyte for primary acid addition. The composition and weight ratio of the composite electrolyte additive are (lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = 0.95:2.95:2:5.1:8.1). An intermittent constant current charging formation process is used for charging and formation. After the formation is completed, a non-reversing acid process is used. Only each cell of the battery tank is acidified for a second time. The liquid level is adjusted. The final electrolyte mixed acid density is 1.280 g / cm 3 , finally, heat seal the small cover, perform air tightness test, and finally perform high current test and battery cleaning and drying;

[0060] Among them, the preparation method of the high-conductivity composite electrolyte additive is as follows: weigh the corresponding raw materials according to the following weight ratio: lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = 0.95:2.95:2:5.1:8.1, add lithium sulfate, aluminum sulfate, germanium sulfate, and silicon dioxide to pure water according to the above proportions, and use a high-speed shearing machine for shearing at room temperature. The high-speed shearing process parameters are 4000-6000rpm, 20-40min, and the preparation of the high-conductivity composite electrolyte additive is completed.

[0061] Example 2

[0062] A formula for a flooded auxiliary battery plate with high charge acceptance and an auxiliary battery manufacturing process, wherein the positive electrode lead paste formula comprises the following components in parts by weight:

[0063]

[0064] The positive electrode and paste process is:

[0065] 1) Sodium peroxide, antimony trioxide, ultra-short fibers, and lead powder were dry-mixed, and deionized water (28% by weight) was added. The addition time was controlled within 1.8 minutes, and the mixture was stirred for 4 minutes.

[0066] 2) Add the remaining deionized water for 3 minutes and continue stirring for 5 minutes;

[0067] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0068] 4) Finally, open the cooling system, continue stirring, and cool to 50°C to obtain the positive electrode lead paste;

[0069] The negative electrode lead paste formula contains the following ingredients in parts by weight:

[0070]

[0071] The negative electrode and paste process is:

[0072] 1) First, stir and mix the ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder. Then, add deionized water (27% by weight) for 2.5 minutes and stir for 3.5 minutes.

[0073] 2) Add the remaining deionized water for 4 minutes and continue stirring for 7 minutes;

[0074] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0075] 4) Finally, open the cooling system, continue stirring, and cool down to 50°C to obtain the negative electrode lead paste.

[0076] The lead paste is transferred to a paste coating hopper and evenly coated on the surface of the grid strip by a paste coating machine. The grid strip is then cut into individual wet plates. The individual wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber. They are cured and dried into dry plates through a curing and drying process.

[0077] The electrode group encapsulation uses PE separator to encapsulate the negative electrode;

[0078] The battery is assembled using a COS cast welding machine. The ends of the encapsulated and assembled electrode group lugs are immersed in a mold filled with molten lead. The positive and negative plate lugs are quickly cast-welded in parallel. The welded electrode groups are then installed in the battery tank. A high current is applied to the connectors of the positive and negative electrode groups using a through-wall welding machine fixture to partially melt the connectors. The pressure is maintained for 3 seconds, and the adjacent connectors are welded together. The batteries are then distributed and installed in the individual cells of the battery tank. The electrode groups are butt-welded using a butt welding process, and the cover is heat-sealed.

[0079] Battery formation: A dilute sulfuric acid solution is used for primary acid addition. 10% of a highly conductive composite electrolyte additive is added to the dilute sulfuric acid electrolyte for primary acid addition. The composition and weight ratio of the composite electrolyte additive are (lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = 1:3.1:2.1:5.2:8.0). An intermittent constant current charging formation process is used for charging and formation. After the formation is completed, a non-reversing acid process is used. Only each cell of the battery tank is acidified for a second time. The liquid level is adjusted. The final electrolyte mixed acid density is 1.283 g / cm 3 , and finally the small cover is heat-sealed, airtightness tested, and finally high current tested and the battery cleaned and dried.

[0080] Example 3

[0081] A formula for a flooded auxiliary battery plate with high charge acceptance and an auxiliary battery manufacturing process, wherein the positive electrode lead paste formula comprises the following components in parts by weight:

[0082]

[0083] The positive electrode and paste process is:

[0084] 1) Sodium peroxide, antimony trioxide, ultra-short fibers, and lead powder were dry-mixed, and deionized water (29% by weight) was added for 2 minutes, followed by stirring for 3.5 minutes.

[0085] 2) Add the remaining deionized water for 3.5 minutes and continue stirring for 6 minutes;

[0086] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0087] 4) Finally, open the cooling system, continue stirring, and cool to 50°C to obtain the positive electrode lead paste;

[0088] The negative electrode lead paste formula contains the following ingredients in parts by weight:

[0089]

[0090] The negative electrode and paste process is:

[0091] 1) First, mix LN-01 composite additive, ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder, then add deionized water (28% by weight) for 2.5 minutes and stir for 4 minutes.

[0092] 2) Add the remaining deionized water for 4 minutes and continue stirring for 8 minutes;

[0093] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0094] 4) Finally, open the cooling system, continue stirring, and cool down to 50°C to obtain the negative electrode lead paste.

[0095] The lead paste is transferred to a paste coating hopper and evenly coated on the surface of the grid strip by a paste coating machine. The grid strip is then cut into individual wet plates. The individual wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber. They are cured and dried into dry plates through a curing and drying process.

[0096] The electrode group encapsulation uses PE separator to encapsulate the negative electrode;

[0097] The battery is assembled using a COS cast welding machine. The ends of the encapsulated and assembled electrode group lugs are immersed in a mold filled with molten lead. The positive and negative plate lugs are quickly cast-welded in parallel. The welded electrode groups are then installed in the battery tank. A high current is applied to the connectors of the positive and negative electrode groups using a through-wall welding machine fixture to partially melt the connectors. The pressure is maintained for 4 seconds, and the adjacent connectors are welded together. The batteries are then distributed and installed in the individual cells of the battery tank. The electrode groups are butt-welded using a butt welding process, and the cover is heat-sealed.

[0098] Battery formation: A dilute sulfuric acid solution is used for primary acid addition. 12% of a highly conductive composite electrolyte additive is added to the dilute sulfuric acid electrolyte for primary acid addition. The composition and weight ratio of the composite electrolyte additive are (lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = 1.1:3.0:2.1:5.0:8.0). An intermittent constant current charging formation process is used for charging and formation. After the formation is completed, a non-returning acid process is used. Only each cell of the battery tank is acidified for a second time. The liquid level is adjusted. The final electrolyte mixed acid density is 1.282 g / cm 3 , and finally the small cover is heat-sealed, airtightness tested, and finally high current tested and the battery cleaned and dried.

[0099] Example 4

[0100] A formula for a flooded auxiliary battery plate with high charge acceptance and an auxiliary battery manufacturing process, wherein the positive electrode lead paste formula comprises the following components in parts by weight:

[0101]

[0102] The positive electrode and paste process is:

[0103] 1) Sodium peroxide, antimony trioxide, ultra-short fibers, and lead powder were dry-mixed, and deionized water (30% by weight of the total deionized water) was added. The water addition time was controlled within 2 minutes, and the mixture was stirred for 4 minutes.

[0104] 2) Add the remaining deionized water for 4 minutes and continue stirring for 6 minutes;

[0105] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0106] 4) Finally, open the cooling system, continue stirring, and cool to 50°C to obtain the positive electrode lead paste;

[0107] The negative electrode lead paste formula contains the following ingredients in parts by weight:

[0108]

[0109]

[0110] The negative electrode and paste process is:

[0111] 1) First, mix LN-01 composite additive, ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder, then add deionized water (28% by weight) for 2 minutes and stir for 4 minutes.

[0112] 2) Add the remaining deionized water for 4 minutes and continue stirring for 7.5 minutes;

[0113] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0114] 4) Finally, open the cooling system, continue stirring, and cool down to 50°C to obtain the negative electrode lead paste.

[0115] The lead paste is transferred to a paste coating hopper and evenly coated on the surface of the grid strip by a paste coating machine. The grid strip is then cut into individual wet plates. The individual wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber. They are cured and dried into dry plates through a curing and drying process.

[0116] The electrode group encapsulation uses PE separator to encapsulate the negative electrode;

[0117] The battery is assembled using a COS cast welding machine. The ends of the encapsulated and assembled electrode group lugs are immersed in a mold filled with molten lead. The positive and negative plate lugs are quickly cast-welded in parallel. The welded electrode groups are then installed in the battery tank. A high current is applied to the connectors of the positive and negative electrode groups using a through-wall welding machine fixture to partially melt the connectors. The pressure is maintained for 5 seconds, and the adjacent connectors are welded together. The batteries are then distributed and installed in the individual cells of the battery tank. The electrode groups are butt-welded using a butt welding process, and the cover is heat-sealed.

[0118] Battery formation: The first acid addition is carried out with conventional dilute sulfuric acid solution, without adding composite electrolyte additives. The intermittent constant current charging formation process is used for charging and formation. After the formation, the non-returning acid process is adopted. Only the secondary acid addition is carried out on each cell of the battery tank to adjust the liquid level. The final electrolyte mixed acid density is 1.280g / cm 3 , and finally the small cover is heat-sealed, airtightness tested, and finally high current tested and the battery cleaned and dried.

[0119] Example 5

[0120] A formula for a flooded auxiliary battery plate with high charge acceptance and an auxiliary battery manufacturing process, wherein the positive electrode lead paste formula comprises the following components in parts by weight:

[0121]

[0122]

[0123] The positive electrode and paste process is:

[0124] 1) Sodium peroxide, antimony trioxide, ultra-short fibers, and lead powder were dry-mixed, and deionized water (30% by weight of the total deionized water) was added. The water addition time was controlled within 2 minutes, and the mixture was stirred for 4 minutes.

[0125] 2) Add the remaining deionized water for 4 minutes and continue stirring for 6 minutes;

[0126] 3) Then add 1.38g / cm 3 Dilute sulfuric acid solution, the acid addition time is controlled within 10 minutes;

[0127] 4) Finally, open the cooling system, continue stirring, and cool to 50°C to obtain the positive electrode lead paste;

[0128] The negative electrode lead paste formula contains the following ingredients in parts by weight:

[0129]

[0130] The negative electrode and paste process is:

[0131] 1) First, mix LN-01 composite additive, ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder, then add deionized water (29% by weight) for 2 minutes and stir for 3 minutes.

[0132] 2) Add the remaining deionized water for 4 minutes and continue stirring for 8 minutes;

[0133] 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time is controlled within 9 minutes;

[0134] 4) Finally, open the cooling system, continue stirring, and cool down to 50°C to obtain the negative electrode lead paste.

[0135] The lead paste is transferred to a paste coating hopper and evenly coated on the surface of the grid strip by a paste coating machine. The grid strip is then cut into individual wet plates. The individual wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber. They are cured and dried into dry plates through a curing and drying process.

[0136] The electrode group encapsulation uses PE separator to encapsulate the negative electrode;

[0137] The battery is assembled using a COS cast welding machine. The ends of the encapsulated and assembled electrode group lugs are immersed in a mold filled with molten lead. The positive and negative plate lugs are quickly cast-welded in parallel. The welded electrode groups are then installed in the battery tank. A high current is applied to the connectors of the positive and negative electrode groups using a through-wall welding machine fixture to partially melt the connectors. The pressure is maintained for 5 seconds, and the adjacent connectors are welded together. The batteries are then distributed and installed in the individual cells of the battery tank. The electrode groups are butt-welded using a butt welding process, and the cover is heat-sealed.

[0138] Battery formation: A dilute sulfuric acid solution is used for primary acid addition. 20% of a highly conductive composite electrolyte additive is added to the dilute sulfuric acid electrolyte for primary acid addition. The composition and weight ratio of the composite electrolyte additive are (lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = 1.1:2.9:2.1:5.1:8.0). An intermittent constant current charging formation process is used for charging and formation. After the formation is completed, a non-returning acid process is used. Only each cell of the battery tank is acidified for a second time. The liquid level is adjusted. The final electrolyte mixed acid density is 1.281 g / cm 3 , and finally the small cover is heat-sealed, airtightness tested, and finally high current tested and the battery cleaned and dried.

[0139] The performance of the auxiliary batteries prepared in Examples 1-5 and conventional flooded auxiliary batteries of the same type were tested, and the test results are listed in Table 1.

[0140] Among them, the deep discharge low voltage charging acceptance test method is:

[0141] a. Within 1 to 5 hours after the battery is fully charged (at 25℃±1℃, charge at a current of 2In(A) until the average voltage of the single cells reaches 2.4V, and then continue charging for 5 hours), and maintain the ambient temperature at 25℃±2℃, discharge at a current of Io(A) for 5 hours (I0=Ce / 10).

[0142] b. After discharge, immediately place the battery in a low-temperature box or low-temperature room at 0°C for at least 20 hours.

[0143] c. After the battery is taken out of the low-temperature box, charge it at a voltage of 14.00V±0.1V within 1 minute. After 10 minutes, record the charging current Ica (A) and calculate the Ica / I0 ratio, which should be ≥2.0.

[0144] Table 1 Performance test results of the prepared auxiliary battery

[0145]

[0146]

[0147] From the data in Table 1, it can be seen that the charge acceptance performance of the auxiliary battery prepared using Example 2 is higher than that of Example 1, indicating that the addition of sodium peroxide as an oxygen enhancer to the positive electrode lead paste formula can improve the deep discharge and low-voltage charge acceptance performance of the auxiliary battery; the charge acceptance performance of the auxiliary battery prepared using Example 3 is higher than that of Example 2, indicating that the addition of the LN-01 composite additive to the negative electrode lead paste formula can improve the deep discharge and low-voltage charge acceptance performance of the battery; the charge acceptance performance of the auxiliary battery prepared using Example 5 is higher than that of Example 4, indicating that the addition of the composite electrolyte additive to the electrolyte can improve the deep discharge and low-voltage charge acceptance capability of the auxiliary battery.

[0148] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A process for manufacturing a flooded auxiliary battery with high charge acceptance, characterized in that: The following steps are involved: Preparation of positive electrode lead paste: The positive electrode lead paste formula contains the following components in parts by weight: The oxygen promoter is used to release oxygen during the plate curing process to form an oxidized corrosion layer at the grid interface; Preparation of negative electrode lead paste: The negative electrode lead paste formula contains the following components in parts by weight: The LN-01 composite additive is a composite crystal prepared by ball milling lead sulfate crystals and activated carbon in a weight ratio of (1±0.2): (1±0.2); the particle size of the composite crystal is 1.5-4.5 μm; Plate preparation: Lead paste is evenly applied to the surface of the grid strip, and then the grid strip is cut into single wet plates. The single wet plates are quickly dried in a drying kiln and then transferred to a curing and drying chamber, where they are cured and dried into dry plates through a curing and drying process. Pole group encapsulation: using separator to encapsulate negative electrode; Battery assembly: Immerse the ends of the encapsulated and assembled electrode group ears into a mold filled with molten lead, quickly cast-weld the positive and negative plate ears in parallel, then install the welded electrode groups into the battery tank, weld the adjacent connectors together, and distribute them into the individual cells of the battery tank. Use the butt welding process to butt-weld the electrode groups, and then heat-seal the cover; Battery formation: A dilute sulfuric acid solution is used for primary acid addition. 10% to 20% of a high-conductivity composite electrolyte additive is added to the dilute sulfuric acid electrolyte for primary acid addition. The composition and weight ratio of the high-conductivity composite electrolyte additive are lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = (1±0.1): (3±0.2): (2±0.2): (5±0.3): (8±0.5). An intermittent constant current charging formation process is used for charging and formation. After the formation is completed, a non-reversing acid process is used. Only a small amount of acid is added to each cell of the battery tank for a second time to adjust the liquid level. At the same time, the electrolyte mixed acid density is ensured to be 1.280±0.005g / cm 3 .

2. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The paste-making process of the positive electrode lead paste is as follows: 1) Weigh the raw materials according to the weight of the positive electrode formula; dry-mix sodium peroxide, antimony trioxide, ultra-short fibers, and lead powder, add deionized water (25-35% by weight) for 1-2 minutes, and stir for 2-4 minutes; 2) Add the remaining deionized water, control the water addition time to 3-4 minutes, and continue stirring for 3-6 minutes; 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time should be controlled within 7 to 10 minutes; 4) Finally, open the cooling system, continue stirring, and cool down to 50±3°C to obtain the positive electrode lead paste.

3. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The paste preparation process of the negative electrode lead paste is as follows: 1) Weigh the raw materials according to the weight of the negative electrode formula; stir and mix the LN-01 composite additive, ultrafine barium sulfate, Norwegian lignin, ultrashort fibers, and lead powder; add deionized water (25-35% by weight) over a period of 1.5-2.5 minutes and stir for 2-4 minutes; 2) Add the remaining deionized water, control the water addition time to 3-4 minutes, and continue stirring for 5-10 minutes; 3) Then add 1.38g / cm 3 For dilute sulfuric acid solution, the acid addition time should be controlled within 7 to 10 minutes; 4) Finally, open the cooling system, continue stirring, and cool down to 50±3°C to obtain the negative electrode lead paste.

4. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The oxygen-promoting agent is sodium peroxide, and the crystal size of the sodium peroxide is 1.5-4 μm.

5. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The separator is a PE separator.

6. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The preparation method of the highly conductive composite electrolyte additive is as follows: weigh the corresponding raw materials according to the following weight ratio: lithium sulfate: aluminum sulfate: germanium sulfate: silicon dioxide: pure water = (1±0.1): (3±0.2): (2±0.2): (5±0.3): (8±0.5), add lithium sulfate, aluminum sulfate, germanium sulfate, and silicon dioxide to pure water according to the above proportions, and shear them using a high-speed shearing machine at room temperature. The high-speed shearing process parameters are 4000-6000rpm, 20-40min, and the preparation of the highly conductive composite electrolyte additive is completed.

7. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The battery formation process also includes heat sealing of the small cover after adjusting the liquid level, air tightness testing, and finally high current testing and battery cleaning and drying.

8. The process for manufacturing a flooded auxiliary battery with high charge acceptance according to claim 1, wherein: The specific method of welding adjacent connectors together during battery assembly is to apply a high current to the connectors of the positive and negative electrode groups using a through-wall welding fixture to partially melt the connectors and maintain pressure for 3-5 seconds.

9. A flooded auxiliary battery manufactured by the manufacturing process of a flooded auxiliary battery with high charge acceptance performance according to any one of claims 1 to 8.

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