阅读说明：本技术 一种铸焊轻型金属负极板栅铅蓄电池汇流排的方法 (Method for cast welding light metal negative grid lead storage battery busbar ) 是由 王振卫 杨彤 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种铸焊轻型金属负极板栅铅蓄电池汇流排的方法,其特征在于,对轻型金属负极板栅进行电镀和/或搪锡处理后再进行铸焊。与现有技术相比,本发明解决了轻型金属应用于铅酸蓄电池板栅的虚焊、假焊现象,汇流排与极耳更好地相熔,化成后电池内阻处于5.96～8.78mΩ之间,有利于轻型金属板栅在达到轻量高能的同时,相应产品在实际生产中实现产业化。(The invention relates to a method for cast-welding a light metal negative grid lead storage battery busbar, which is characterized in that the light metal negative grid is subjected to cast welding after being subjected to electroplating and/or tin coating treatment. Compared with the prior art, the invention solves the problems of insufficient welding and false welding of the light metal applied to the lead-acid storage battery grid, the bus bar and the lugs are better fused, the internal resistance of the battery after formation is between 5.96 and 8.78m omega, and the light metal grid is beneficial to achieving light weight and high energy and realizing industrialization of corresponding products in actual production.)

1. A method for cast-welding a light metal negative grid lead storage battery busbar is characterized in that the light metal negative grid is subjected to electroplating and/or tin coating treatment and then cast-welded.

2. The method of cast-welding a light metal negative grid lead battery busbar according to claim 1, wherein the electroplating process comprises applying a dense and integral lead or lead-tin alloy coating to the light metal negative grid; the matrix material of the light metal negative grid comprises copper, copper alloy, aluminum or aluminum alloy.

3. The method for cast-welding a lead storage battery busbar of a light metal negative grid according to claim 2, wherein the thickness of the lead or lead-tin alloy coating is 10-110 μm, and the content of tin in the lead-tin alloy coating is 0.1-10 wt%.

4. The method of cast-on-weld a light metal negative grid lead battery busbar of claim 1, wherein said plating process conditions are: under the condition of room temperature, the current density is 1-5A/dm²The time is 10-40 min.

5. The method for cast-welding a light metal negative grid lead storage battery busbar according to claim 1, wherein the tin coating treatment specifically comprises the following steps:

(1) processing and assembling a light metal negative grid into a grid group;

(2) arranging the lugs of the pole group in order, and coating soldering flux;

(3) and immersing the tab coated with the soldering flux into a tin pot for tin coating for 1-2 times.

6. The method of cast-welding light-metal negative grid lead battery busbar according to claim 5, wherein the step (1) comprises coating an active material on the light-metal negative grid, and then curing, slicing and brushing;

the method for coating the soldering flux in the step (2) is to dip the tab into the soldering flux;

the tin coating conditions in the step (3) are as follows: the first tin coating time is 1-15 s, the temperature is 240-350 ℃, the second tin coating time is 1-10 s, and the temperature is 230-350 ℃.

7. The method for cast-welding a light metal negative grid lead storage battery busbar according to claim 6, wherein the dipping height of the soldering flux in the step (2) is 2-10 mm at a tab, and the dipping time is 1-15 s.

8. The method for cast-welding a light metal negative grid lead storage battery busbar according to claim 5, wherein the flux in the step (2) comprises the following components in parts by weight: 6-13 parts of 50% phosphoric acid solution, 2-7 parts of oxalic acid, 2-10 parts of glycerol and 60-80 parts of ethanol.

9. A method of cast-welding a light metal negative grid lead battery busbar according to claim 1, wherein said cast-welding process comprises: and (3) inserting the lug of the light metal negative plate grid into the lead liquid with the temperature of 450-500 ℃, and gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the lug into the lead liquid.

10. The method for cast-welding a light metal negative grid lead storage battery busbar according to claim 9, wherein the temperature of the lead liquid and the tab during connection is 260-400 ℃, and the process duration is 40-120 s.

Technical Field

The invention relates to the technical field of lead storage battery preparation, in particular to a method for cast-welding a light metal negative grid lead storage battery busbar.

Background

The lead-acid battery is the battery with the largest production and market at present because the lead-acid battery is safe and reliable and has low price, and the waste battery can be almost completely recycled. However, the low energy density (about 30-40kW/Kg) limits many application fields, so that the improvement of the energy density is an important direction of research and development. Analysis of the composition of lead-acid batteries has made it clear that one of the most important reasons for the low specific energy is the high amount of lead (mainly lead-based alloy grid material) which is an inactive substance. Therefore, the development of light grid materials for lead-acid batteries has been an important research topic.

The light weight of the grid is required to realize the integral weight reduction of the lead-acid battery, and the charge and discharge performance of the battery cannot be obviously sacrificed. The light metal grid is an important direction for realizing the light weight of the lead-acid battery grid. The main measure of the light weight of the grid is to replace the lead grid with a non-lead conductive material with light specific gravity. The non-lead grid material is required to support the active material, minimize internal resistance of the cell, and be stable in the electrolyte. The choice of non-lead grid material has a non-negligible effect on both lead acid battery performance and life.

Lead or lead-tin alloy is electroplated on the light base material, and the lead or lead-tin alloy can replace the traditional lead-base alloy to be used as a grid material of the lead-acid storage battery, so that the specific energy of the lead-acid storage battery is improved. The light metal and the alloy thereof as the negative grid of the lead-acid battery have small overpotential, reasonable current density in the reaction process, active substances can participate in the reaction to a greater extent, and the lead-acid battery has better discharge performance. The light metal grid is used for the negative electrode of the battery, so that the internal resistance of the battery can be reduced, the low-temperature performance is improved, the quality of the grid is reduced, and the output power is improved. It also has wide application prospect in fixing lead accumulator.

The light metal material is used as the lead-acid battery negative plate grid, and because the melting point difference between the light metal such as copper and the alloy thereof or aluminum and the alloy thereof and the lead alloy is larger, the problems of insufficient welding, false welding, even incapability of welding and the like when a cast-weld busbar is exposed in the manufacturing and assembling of a finished battery are solved, if the manufacturing process problems of the novel light metal plate grid in the actual production of the battery can be effectively solved, the industrial application of the light plate grid in the lead storage battery can be further promoted, the concept of light weight and high energy of the lead storage battery is really realized, and the quality and the performance of the lead storage battery are integrally promoted in the market.

Disclosure of Invention

The invention aims to provide a method for cast-welding a light metal negative grid lead storage battery busbar, which solves the problems of insufficient welding, false welding, even no welding and the like of a light metal grid during cast-welding of the busbar in the manufacturing and assembling process of a battery production line.

The purpose of the invention can be realized by the following technical scheme: a method for cast-welding light metal negative grid lead accumulator busbar includes electroplating and/or tin coating light metal negative grid, and then cast-welding.

Further, the electroplating treatment comprises plating a compact and complete lead or lead-tin alloy plating layer on the whole of the light metal negative grid. If necessary, the light metal negative grid can be inverted, and the tabs are only positioned in the plating solution of the plating system for plating again. The lead, tin or lead-tin alloy deposited on the aluminum substrate by the electroplating method has much better performance than the grid prepared by other methods, and the necessary condition for the simultaneous discharge of several ions on the cathode is that the precipitation potentials of the ions are close according to the law of electrode process. The precipitation potentials of lead and tin are-0.127V and-0.136V respectively at normal temperature, and the co-deposition is easy to realize. In the plating solution, the action of complex or additive on lead and tin ions makes the potentials of the lead and tin ions closer, so that the co-deposition on the cathode is very easy, and the lead-tin alloy plating layer with all proportions from pure lead to pure tin can be obtained only by changing the contents of lead and tin. Lead and lead-tin alloy are plated on the surface of the grid, so that alpha-PbO can be reduced₂The amount of the lead-acid battery electrolyte is reduced, so that the problem of a passivation layer caused by charging is greatly reduced, and the corrosion resistance of the light metal matrix in the internal charging and discharging environment of the lead-acid battery is ensured. And the lead and lead-tin alloy plating layer can improve the interface property of a grid/active substance, improve the charge acceptance of the electrode and reduce the corrosion of the electrode. Electroplating is used as a mature process, has reached a normal state in industrial application, is easy to realize, and promotes the realization of the industrial batch application of the light metal grid in the lead-acid battery.

The matrix material of the light metal negative grid comprises copper, copper alloy, aluminum or aluminum alloy. The invention designs a lead-acid battery negative grid aiming at a sealed valve-controlled lead-acid battery with corresponding functions and types, wherein the grid matrix material adopts light metal which can be copper and copper alloy, aluminum and aluminum alloy and other light metal grids with all electrical conductivity and mechanical strength meeting the working requirements of the lead-acid battery, the light metal has small overpotential, reasonable current density in the reaction process, active substances can participate in the reaction to a greater extent, and the grid has better discharge performance. However, the melting point of the light metal is very different from that of the metal lead, and the light metal is usually not completely melted and welded with the tabs when a battery plate group bus bar is cast, so that the resistance value at the joint is increased to influence the performance of the battery, and even lead-acid batteries are caused to fail early to influence the service life of the battery, which becomes one of the problems that the light metal grid is urgently needed to be solved in the industrial popularization process. The invention solves the problem that the tabs and the bus bar cannot be completely melted and welded together in the cast-weld process by electroplating and/or tinning the light metal negative grid.

The light metal negative grid is suitable for various structures such as casting type, die casting type, continuous rolling type, net drawing type, foam type, composite grid and the like. The light metal material negative grid can be suitable for various types of power valve control lead-acid storage batteries, valve control lead-acid storage batteries for starting, valve control lead-acid storage batteries for energy storage and the like.

Furthermore, the thickness of the lead or lead-tin alloy coating is 10-110 μm, and the content of tin in the lead-tin alloy coating is 0.1-10 wt%. Preferably, the thickness of the lead or lead-tin alloy coating is between 50 and 110 μm, so that the normal operation requirement of the lead storage battery can be met, and light metal ions cannot enter into the electrolyte to damage the battery performance. If the secondary electroplating operation is carried out on the tab of the light metal negative plate grid, the thickness of the lead or lead-tin alloy coating at the tab is 80-100 mu m.

The electroplating treatment conditions are as follows: under the condition of room temperature, the current density is 1-5A/dm²The time is 10-40 min.

The tin coating treatment specifically comprises the following steps:

(1) processing and assembling a light metal negative grid into a grid group;

(2) arranging the lugs of the pole group in order, and coating soldering flux;

(3) and immersing the tab coated with the soldering flux into a tin pot for tin coating for 1-2 times.

Further, the treatment in the step (1) is to coat an active substance on a light metal negative grid, and then to solidify, slice and brush;

the method for coating the soldering flux in the step (2) is to dip the tab into the soldering flux;

the tin coating conditions in the step (3) are as follows: the first tin coating time is 1-15 s, the temperature is 240-350 ℃, the second tin coating time is 1-10 s, and the temperature is 230-350 ℃.

Furthermore, the dipping height of the soldering flux in the step (2) is 2-10 mm at the position of the tab, and the dipping time is 1-15 s.

The soldering flux in the step (2) comprises the following components in parts by weight: 6-13 parts of 50% phosphoric acid solution, 2-7 parts of oxalic acid, 2-10 parts of glycerol and 60-80 parts of ethanol.

The cast-weld process comprises: and (3) inserting the lug of the light metal negative plate grid into the lead liquid with the temperature of 450-500 ℃, and gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the lug into the lead liquid.

Further, the temperature of the lead liquid and the tab during connection is 260-400 ℃, and the process duration is 40-120 s.

During the cast-on process, the tin plating establishes additional eutectic liquid at the tab-busbar interface, facilitating the formation of an upper meniscus and complete fusion of the busbar with the tab.

The invention provides a method for cast-welding a lead storage battery busbar of a light metal negative grid, which can carry out lead electroplating and lead-tin alloy plating treatment on the grid before assembling a grid group, and the effective area of a lug needing secondary electroplating is controlled to be small as much as possible; after the pole group is assembled, before the bus bar is cast-welded, the bus bar is tin-plated, and then the bus bar is inserted into a mould for cast-welding. The method solves the problem of cast welding of the high-performance high-specific power light metal grid on the basis of being close to an industrial method to the maximum extent by using the mature electroplating and tin coating operations in the current-stage research.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, the light metal negative plate grid is electroplated and/or tinned, so that the busbar and the lug are better fused, and the problems of insufficient welding, false welding, even incapability of welding and the like during cast-weld busbar in the manufacturing and assembling process of a battery production line of the light metal plate grid are solved;

2. according to the invention, by electroplating lead and lead-tin alloy plating or tin coating, eutectic liquid is established on a tab-busbar interface, so that the tab and the busbar are completely fused and welded together during cast welding, the contact resistance at a joint is minimized, and the advantages of smaller internal resistance of the battery are better exerted compared with the conventional lead-acid battery which adopts light metal and alloy thereof, the internal resistance of the battery after formation is between 5.96 and 8.78m omega, and the light metal grid is beneficial to realizing industrialization of corresponding products in actual production while achieving light weight and high energy;

3. according to the invention, through controlling the thickness of the lead or lead-tin alloy coating, the problems of insufficient solder, false solder and the like in the cast-weld process are solved, the normal operation requirement of the lead storage battery can be met, and light metal ions cannot enter into electrolyte to damage the battery performance;

4. according to the invention, through controlling the operation conditions in the electroplating and tin coating processes, the phenomenon that fusion is lacked at two sides of the tab caused by improper operation is prevented, the contact quality of a bus bar and the tab is influenced, the mechanical strength of a connection part of the tab is further influenced, the internal resistance of a battery is increased, the electrical property is influenced, cold welding or over welding on the tab is prevented, the over welding is that the bus bar and the tab interact excessively and strongly, the over welding is caused if the number is small, the tab is obviously thinned, and the tab is broken if the number is large;

5. the invention controls the dipping height of the soldering flux at the tab, controls the tab melting height, and leads to cold welding without melting completely, and leads to thinning, strength reduction and even early failure of the tab due to excessive melting.

Detailed Description

The following examples are given to illustrate the present invention, and the following examples are carried out on the premise of the technical solution of the present invention, and give detailed embodiments and specific procedures, but the scope of the present invention is not limited to the following examples.

Example 1

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-20 type lead-acid battery, a 20Ah grid-drawing type lead-acid battery negative grid is designed, wherein the alloy component of a grid matrix material contains 0.6-7 parts of Sn, Pb and P, and the balance is Cu;

(2) the tin content of the electroplated lead-tin coating is 9 percent;

(3) the 20Ah drawn-mesh tin bronze negative grid is integrally plated with a lead-tin alloy plating layer according to the requirements, and the thickness of the plating layer is 54 micrometers; inverting the lead-acid battery plated with the lead-tin plating layer by using a tin bronze negative grid, and electroplating lead and tin in a lead-tin electroplating system plating solution by using a tab, wherein the lead-tin alloy plating layer at the tab is 89 mu m;

(4) coating active substances on the processed tin bronze negative expanded metal grid, and finally assembling into a plate group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 10 parts of 50% phosphoric acid solution, 6 parts of oxalic acid, 3 parts of glycerol and 78 parts of ethanol; the height of the tab dipping soldering flux is 3.2mm, and the dipping time is 2 s;

(5) immersing the tab coated with the soldering flux into a tin pot, keeping the temperature of the tin pot above 240 ℃ for 3s, taking out, placing the tab after tin plating into the tin pot, and carrying out tin plating again, keeping the temperature of the tin pot above 230 ℃ for 2 s;

(6) placing the electrode lug subjected to the superposition tin-coating operation in a casting-welding mould required by a corresponding model, inserting the electrode lug into lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the electrode lug into the lead liquid, and keeping the process for 67s, wherein the temperature of the lead liquid is about 380 ℃ when the lead liquid is connected with the electrode lug;

(7) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation at the bus bar obtained in example 1 was measured to be 6.34m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 2

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-100 type lead-acid battery, a 100Ah grid-drawing type lead-acid battery negative grid is designed, wherein the matrix material of the grid contains 1-4 parts of Pb and Zn in total, and the balance is Cu;

(2) the tin content of the electroplated lead-tin coating is 6.3 percent;

(3) the 20Ah net-drawing tin bronze negative grid is integrally plated with a lead-tin alloy plating layer according to the requirements, and the thickness of the plating layer is 60 mu m; inverting the lead-acid battery plated with the lead-tin plating layer by using a tin bronze negative pull net grid, and electroplating lead-tin once in a lead-tin electroplating system plating solution, wherein the lead-tin alloy plating layer at the tab is 94 mu m;

(4) coating active substances on the processed tin bronze negative expanded metal grid, and finally assembling into a plate group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 12 parts of 50% phosphoric acid solution, 4 parts of oxalic acid, 3 parts of glycerol and 76 parts of ethanol; the height of the tab dipping soldering flux is 4mm, and the dipping time is 2 s;

(5) immersing the tab coated with the soldering flux into a tin pot, keeping the temperature of the tin pot above 251 ℃ for 3s, taking out, placing the tab after tin enameling into the tin pot, carrying out tin enameling again, keeping the temperature of the tin pot above 243 ℃ for 2 s;

(6) placing the electrode lug subjected to the superposition tin-coating operation in a casting-welding mould required by a corresponding model, inserting the electrode lug into lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the electrode lug into the lead liquid, and keeping the process for 78s, wherein the temperature of the lead liquid is about 380 ℃ when the lead liquid is connected with the electrode lug;

(7) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation at the bus bar obtained in example 2 was measured to be 5.98m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 3

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-20 type lead-acid battery, a 20Ah grid-drawing type lead-acid battery negative grid is designed, and a grid base material adopts an alloy formula and comprises 5-10 parts of Sn, Pb and P, and the balance of Cu;

(2) plating lead on the whole negative grid;

(3) the 20Ah net-drawing tin bronze negative grid is integrally plated with a lead-tin alloy plating layer according to the requirements, and the thickness of the plating layer is 65 mu m; inverting the lead-acid battery plated with the lead-tin plating layer by using a tin bronze negative pull net grid, and electroplating lead and tin once in a lead-tin electroplating system plating solution, wherein the lead-tin alloy plating layer at the tab is 98 mu m;

(4) coating active substances on the processed tin bronze negative expanded metal grid, and finally assembling into a plate group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 11 parts of 50% phosphoric acid solution, 4 parts of oxalic acid, 3 parts of glycerol and 75 parts of ethanol; the height of the tab dipping soldering flux is 3.8mm, and the dipping time is 2 s;

(5) placing the operated tab in a casting and welding mould required by the corresponding model, inserting the tab into a lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the tab into the lead liquid, and keeping the temperature of the lead liquid and the tab at about 380 ℃ during connection for 84 s;

(6) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation at the bus bar obtained in example 3 was measured to be 6.76m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 4

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-EVF-32 type lead-acid battery, a 32Ah composite lead-acid battery negative grid is designed, wherein the matrix material components of the grid comprise 1-7 parts of Cu, Mn, Mg, Si and Fe, and the balance is Al;

(2) the tin content of the electroplated lead-tin coating is 3.2 percent;

(3) the 32Ah composite aluminum alloy negative grid is integrally plated with a lead-tin alloy plating layer according to the requirements, and the thickness of the plating layer is 74 microns; inverting the lead-acid battery plated with the lead-tin plating layer by using a tin bronze negative pull net grid, and electroplating lead-tin once in a lead-tin electroplating system plating solution, wherein the lead-tin alloy plating layer at the lead is 100 mu m;

(4) coating active substances on the processed tin bronze negative expanded metal grid, and finally assembling into a plate group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 10 parts of 50% phosphoric acid solution, 6 parts of oxalic acid, 3 parts of glycerol and 78 parts of ethanol; the height of the tab dipping soldering flux is 3.2mm, and the dipping time is 2 s;

(5) immersing the tab coated with the soldering flux into a tin pot, keeping the temperature of the tin pot above 240 ℃, keeping for 5s, and taking out;

(6) placing the electrode lug subjected to the superposition tin-coating operation in a casting-welding mould required by a corresponding model, inserting the electrode lug into lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the electrode lug into the lead liquid, and keeping the process for 86s, wherein the temperature of the lead liquid is about 380 ℃ when the lead liquid is connected with the electrode lug;

(7) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation at the bus bar obtained in example 4 was measured to be 7.35m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 5

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-100 type lead-acid battery, a 100Ah grid-drawing type lead-acid battery negative grid is designed, wherein the matrix material of the grid contains 1-9 parts of Cu, Mn, Mg, Si and Fe, and the balance is Al;

(2) the tin content of the electroplated lead-tin coating is 2.1 percent;

(3) the 20Ah expanded aluminum alloy negative grid is integrally plated with a lead-tin alloy plating layer according to the requirements, and the thickness of the plating layer is 54 mu m; inverting the lead-acid battery plated with the lead-tin plating layer by using an aluminum alloy negative expanded grid, and placing a tab in a lead-tin electroplating system plating solution to electroplate lead and tin again, wherein the lead-tin alloy plating layer at the tab is 92 mu m;

(4) coating active substances on the processed aluminum alloy negative expanded grid, and finally assembling into a grid group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 10 parts of 50% phosphoric acid solution, 6 parts of oxalic acid, 3 parts of glycerol and 78 parts of ethanol; the height of the tab dipping soldering flux is 3.2mm, and the dipping time is 2 s;

(5) immersing the tab coated with the soldering flux into a tin pot, keeping the temperature of the tin pot above 240 ℃, continuing for 3s, and taking out;

(6) placing the electrode lug subjected to the superposition tin-coating operation in a casting-welding mould required by a corresponding model, inserting the electrode lug into lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the electrode lug into the lead liquid, and keeping the process for 67s, wherein the temperature of the lead liquid is about 380 ℃ when the lead liquid is connected with the electrode lug;

(7) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation was measured at the bus bar obtained in example 5 to be 7.82m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 6

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-100 type lead-acid battery, a 100Ah grid-drawing type lead-acid battery negative grid is designed, wherein the matrix material of the grid contains 1-7 parts of Cu, Mn, Mg, Si and Fe, and the balance is Al;

(2) the tin content of the electroplated lead-tin coating is 1.5 percent;

(3) the 100Ah expanded aluminum alloy negative grid is integrally plated with a lead-tin alloy plating layer according to the requirements, and the thickness of the plating layer is 100 mu m;

(4) coating active substances on the processed aluminum alloy negative expanded grid, and finally assembling into a grid group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 10 parts of 50% phosphoric acid solution, 6 parts of oxalic acid, 3 parts of glycerol and 78 parts of ethanol; the height of the tab dipping soldering flux is 3.2mm, and the dipping time is 2 s;

(5) placing the operated tab in a casting welding mould required by a corresponding model, inserting the tab into a lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the tab into the lead liquid, and keeping the process for 110s, wherein the temperature of the lead liquid is about 380 ℃ when the lead liquid is connected with the tab;

(6) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation was measured at the bus bar obtained in example 6 to be 8.32m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 7

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-20 type lead-acid battery, a 20Ah grid-drawing type lead-acid battery negative grid is designed, wherein the matrix material of the grid contains 1-4 parts of Sn, Pb and P, and the balance of Cu;

(2) plating lead on the whole negative grid;

(3) the 100Ah drawn-mesh tin bronze negative grid is integrally plated with a lead plating layer according to the requirements, and the thickness of the plating layer is 75 micrometers;

(4) coating active substances on the processed tin bronze negative expanded metal grid, and finally assembling into a plate group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 7 parts of 50% phosphoric acid solution, 5 parts of oxalic acid, 4 parts of glycerol and 69 parts of ethanol; the height of the tab dipping soldering flux is 5mm, and the dipping time is 15 s;

(5) placing the operated tab in a casting welding mould required by a corresponding model, inserting the tab into a lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the tab into the lead liquid, and keeping the temperature of the lead liquid and the tab at about 380 ℃ during connection for 120 s;

(6) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation was measured at the bus bar obtained in example 7 to be 6.51m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 8

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-EVF-32 type lead-acid battery, a 32Ah composite lead-acid battery negative grid is designed, wherein the matrix material components of the grid contain 1-8 parts of Cu, Mn, Mg, Si and Fe, and the balance is Al;

(2) plating lead on the whole negative grid;

(3) the 32Ah expanded aluminum alloy negative grid is integrally plated with a lead plating layer according to the requirements, and the thickness of the plating layer is 63 mu m;

(4) coating active substances on the processed aluminum alloy negative expanded grid, and finally assembling into a grid group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 8 parts of 50% phosphoric acid solution, 3 parts of oxalic acid, 5 parts of glycerol and 70 parts of ethanol; the height of the tab dipping soldering flux is 10mm, and the dipping time is 15 s;

(5) placing the operated tab in a casting welding mould required by a corresponding model, inserting the tab into a lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the tab into the lead liquid, and keeping the process for 41s, wherein the temperature of the lead liquid is about 380 ℃ when the lead liquid is connected with the tab;

(6) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation was measured at the bus bar obtained in example 8 to be 6.83m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

Example 9

A method for cast-welding a light metal negative grid lead storage battery busbar specifically comprises the following steps:

(1) aiming at a 6-DZM-20 type lead-acid battery, a 20Ah grid-drawing type lead-acid battery negative grid is designed, and a grid base material adopts an alloy formula and comprises 1-9 parts of Sn, Pb and P in total, and the balance of Cu;

(2) the tin content of the electroplated lead-tin coating is 10 percent;

(3) the 20Ah drawn-mesh tin bronze negative grid is integrally plated with a lead-tin plating layer according to the requirements, and the thickness of the plating layer is 60 micrometers;

(4) coating active substances on the processed tin bronze negative expanded metal grid, and finally assembling into a plate group through the steps of curing, slicing, brushing and the like; during cast welding, the lugs of the electrode group are arranged in order, and the flux is coated and configured as follows: 9 parts of 50% phosphoric acid solution, 7 parts of oxalic acid, 2 parts of glycerol and 80 parts of ethanol; the height of the tab dipping soldering flux is 10mm, and the dipping time is 1 s;

(5) placing the operated tab in a casting and welding mould required by the corresponding model, inserting the tab into a lead liquid with the temperature of 450-500 ℃, gradually reducing the temperature of the lead liquid to 410-460 ℃ in the whole process of inserting the tab into the lead liquid, and keeping the temperature of the lead liquid and the tab at about 380 ℃ during connection for 115 s;

(6) and (5) after the cast welding is finished, demolding the pole group and taking out.

The internal resistance of the battery after formation was measured at the bus bar obtained in example 9 was 7.21m Ω, and it was observed that the tab and the bus bar were connected perfectly, the contact shape was meniscus, and no cold joint phenomenon was present.

The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.