Manufacturing method of composite energy storage lead storage battery

Abstract

The invention relates to a manufacturing method of a composite energy storage lead storage battery, belongs to the technical field of battery preparation, and solves the problems of non-uniform current distribution and acid layering in the use process of a lead energy storage battery in the prior art. The method comprises the following steps: step 1, manufacturing a polar plate; 2, assembling the polar plates and the partition plates; step 3, assembling a busbar; and 4, assembling the battery. The invention can realize uniform current distribution, high charge and discharge efficiency and consistent acid liquor concentration in the use process of the battery, and avoids the phenomenon of acid stratification.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a method for manufacturing a composite energy storage lead-acid battery. Background Technology

[0002] In existing energy storage batteries, the current is typically collected using a single tab. While this provides high current transfer efficiency, it results in an unbalanced distribution of input and output current. As current flows through the tab, heat is generated due to resistance. This uneven current distribution can cause the tab to deform due to excessive heat, reducing the battery's charge / discharge efficiency and potentially affecting its performance and lifespan. The risk of localized overheating of the tab is even greater under high-rate charge / discharge conditions or prolonged continuous operation. Furthermore, because the tab is usually positioned above the plates, and the composite lead wires of the plates are placed vertically, acid stratification is easily caused during use, leading to decreased battery performance and shortened battery life. Summary of the Invention

[0003] Based on the above analysis, the present invention aims to provide a method for manufacturing a composite energy storage lead-acid battery to solve the problems of uneven current distribution and acid stratification during use of lead-acid energy storage batteries.

[0004] The objective of this invention is mainly achieved through the following technical solutions:

[0005] A method for manufacturing a composite energy storage lead-acid battery includes the following steps:

[0006] Step 1: Fabricate the electrode plates;

[0007] Step 2: Assemble the electrode plates and separators;

[0008] Step 3: Assemble the bus;

[0009] Step 4: Assemble the battery.

[0010] Furthermore, step 1 specifically includes:

[0011] Step 1.1: Using polyethylene as the matrix, composite lead wire is injection molded together with the frame and transverse ribs to form a composite grid.

[0012] Step 1.2: The composite grid is chemically modified into a conductor, and a lead layer is sprayed onto the surface to form a lead electrode grid;

[0013] Step 1.3: Coat the plate grid frame with lead paste containing active material to form the electrode plate.

[0014] Further, the injection-molded composite grid in step 1.1 includes:

[0015] The formed composite lead wires are arranged in parallel and embedded in the lead wire half-hole lines of the lower mold of the injection molding machine. The lead wire half-hole lines are perpendicular to the length direction of the transverse ribs in the injection frame. The upper mold and the lower mold of the injection molding machine are closed to form a complete plate grid model injection space. After injection and cooling, the injection plate grid is formed.

[0016] The outer edge of the composite grating frame and the cross section of the transverse ribs are both diamond-shaped to separate them from the injection mold.

[0017] Furthermore, step 3 specifically includes:

[0018] Step 3.1: Butt weld the busbar grid;

[0019] Step 3.2: Soldering the terminal posts and fabricating the copper core;

[0020] Step 3.3: Treat the welding points between the busbar and the exposed lead wire by spraying glue or dipping in wax.

[0021] Furthermore, step 3.1 specifically includes:

[0022] Step 3.1.1: The composite lead wire is immersed in flux solution to coat it with molten lead and tin;

[0023] Step 3.1.2: Perform positive and negative butt welding on the busbar;

[0024] Further, step 3.1.2 specifically includes:

[0025] Step 3.1.2.1: Align the fixture with the mold;

[0026] Step 3.1.2.2: Heat the casting mold and pour in molten lead for casting;

[0027] Step 3.1.2.3: After the fixture and mold are positioned and the casting and welding are completed, the manifold grid is removed from the mold.

[0028] Furthermore, the positioning of the fixture and mold in step 3.1.2.3 includes:

[0029] The fixture fits into the mold, the locating pin enters the locating pin hole, and the mold is positioned.

[0030] Furthermore, the specific method by which the confluence grid detaches from the mold in step 3.1.2.3 is as follows:

[0031] The mold is equipped with a cooling device, which separates the molten welding liquid from the mold after it solidifies.

[0032] Furthermore, the separation of the molten welding solution from the mold after solidification includes:

[0033] The cross-section of the ductwork grid is trapezoidal, with the thickness gradually increasing from top to bottom, forming a large draft angle that separates the ductwork grid from the mold.

[0034] Further, step 1.1, injection molding of the composite grid, specifically includes:

[0035] Before mold closing, the composite lead wires are arranged in parallel and staggered layers and embedded in the staggered half-holes of the lead wires in the lower mold of the corresponding injection molding machine. After mold closing, a composite lead wire is formed, which is arranged in parallel and staggered layers and embedded in the lead wire holes of the injection molding machine mold. After injection molding, a three-dimensional injection molding plate grid with multiple layers of composite lead wires is formed.

[0036] Further, step 3.1.3 specifically includes:

[0037] After the casting and welding are completed, a positive electrode busbar and a negative electrode busbar are formed on both sides of the assembly of the electrode plate and the separator; the positive electrode busbar is connected to the positive electrode lead wire, and the negative electrode busbar is connected to the negative electrode lead wire.

[0038] Furthermore, in step 3.1.2.3, the positioning of the mold further includes:

[0039] The mold has multiple cylindrical slots, and the length direction of each composite lead wire is perpendicular to the length direction of the cylindrical slot. Each composite lead wire is connected to a cylindrical slot in the mold, and the center of the connection point is located at the center line of the cylindrical slot. Multiple cylindrical slots form multiple longitudinal ribs, so that after casting and welding, each composite lead wire is connected to the longitudinal rib of each flow grid, forming multiple flow nodes.

[0040] Furthermore, step 3.1.3 also includes:

[0041] After welding, the positive and negative electrode busbars are set vertically, the longitudinal grid ribs are set vertically, and the composite lead wires of the electrode plates are horizontally connected to the longitudinal grid ribs to form multiple horizontal channels for acid flow during battery use.

[0042] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0043] (1) The frame and transverse ribs of the plates are made of polyethylene. The polyethylene grid matrix does not participate in the chemical and electrochemical reactions throughout the battery life, which reduces the expansion, corrosion and fracture of the grid during the cycle life, and enables the grid to provide support and constraint for the active material throughout the entire cycle.

[0044] (2) After casting and welding, the manifold is removed from the mold. Since the cross section of the manifold is trapezoidal, the thickness changes slowly at the top and bottom, forming a large draft angle over the entire height, which makes it easy to separate the mold from the manifold after casting and welding.

[0045] (3) Compared with the prior art, the lead wire holes of the present invention are staggered on both sides of the injection molding frame, and the composite lead wire is inserted into the lead wire holes, perpendicular to the length direction of the transverse ribs, forming a three-dimensional grid with multiple layers of lead wires. The three-dimensional grid is beneficial to current transmission and can make the current density of each part of the electrode plate uniformly distributed during charging and discharging, so as to achieve current stability and low loss. The outer edge of the frame of the composite grid and the cross section of the transverse ribs are both rhomboid structures, which can provide stable support while reducing the amount of injection molding material and facilitate demolding after injection molding.

[0046] (4) In the prior art, after the battery is formed, current is collected through tabs. The tabs are set above the plates, and the composite lead wires of the plates are placed vertically. During use, the acid flows along the upper and lower channels formed by the lead wires. The acid with higher concentration sinks and the acid with lower concentration rises, forming obvious acid stratification. Compared with the prior art, the present invention symmetrically sets positive and negative current collection grids on both sides of the plates and separator assembly to replace the tabs in the prior art. The composite lead wires of the plates are placed horizontally, and the acid flows along the horizontal channels formed by the lead wires during use. The acid concentration is consistent throughout the battery, and acid stratification will not occur.

[0047] (5) The current-collecting grid of the present invention, after casting and welding, has multiple longitudinal grid ribs, with each composite lead wire of the electrode plate corresponding to one longitudinal grid rib. Each longitudinal grid rib can independently connect each composite lead wire on the electrode plate, making the current conduction resistance smaller and beneficial for practical high-power usage environments. Compared with the prior art of collecting current from each electrode plate through tabs, the present invention uses a current-collecting grid instead of tabs. The connection between the composite lead wire and the longitudinal grid ribs of the current-collecting grid forms multiple collecting nodes, making the current distribution uniform. It can achieve large-area current collection in the side area of ​​each electrode plate, which can significantly improve the working efficiency under high-power conditions and improve the charging and discharging capacity of the battery.

[0048] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0049] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0050] Figure 1 A flowchart illustrating the manufacturing method of a composite energy storage lead-acid battery;

[0051] Figure 2 This is a schematic diagram of the electrode plate structure;

[0052] Figure 3 A schematic diagram of the electrode frame, grid ribs, and composite lead wire;

[0053] Figure 4 A schematic diagram of the fixture structure for assembling the electrode plates and separators;

[0054] Figure 5 This is a schematic diagram of the casting and welding mold structure;

[0055] Figure 6 A schematic diagram of the structure during casting and welding after positioning the fixture and mold;

[0056] Figure 7 This is a schematic diagram of the busbar grid structure;

[0057] Figure 8 This is a schematic diagram of the structure after the busbar is assembled with the electrode plates and separators;

[0058] Figure 9 This is a schematic diagram of the assembled battery structure.

[0059] Figure label:

[0060] 1-Electrical plate, 101-Frame, 102-Transverse rib, 103-Composite lead wire, 104-Lead paste, 2-Separator, 3-Clamp, 301-Positioning pin, 302-Fixed plate, 303-Moving plate, 304-Fastening eccentric wheel, 4-Mold, 401-Handle, 402-Positioning pin hole, 403-Cylindrical slot, 5-Busbar, 51-Busbar grid, 511-Longitudinal grid rib, 512-Transverse grid rib, 52-End post, 53-Copper core, 6-Battery casing. Detailed Implementation

[0061] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0062] A specific embodiment of the present invention, such as Figure 1 As shown, a method for manufacturing a composite energy storage lead-acid battery is disclosed, comprising the following steps:

[0063] Step 1: Fabricate electrode plate 1;

[0064] Step 2: Assemble electrode 1 and separator 2;

[0065] Step 3: Assemble bus 5;

[0066] Step 4: Assemble the battery.

[0067] In step 1, the fabrication of electrode plate 1 specifically includes:

[0068] Step 1.1: Using polyethylene as the matrix, composite lead wire 103, frame 101, and transverse ribs 102 are injection molded together to form a composite grid.

[0069] Step 1.1 specifically includes:

[0070] After lead ingots are extruded into lead-tin alloy composite lead wires 103 by a lead extrusion press, the formed composite lead wires 103 are arranged in parallel and embedded into the lead wire half-hole lines of the lower mold of the injection molding machine mold 4. The lower mold of the injection molding machine mold is also provided with a frame 101 and a transverse rib 102 half-hole line. The lead wire half-hole lines in the injection frame 101 are perpendicular to each other in the length direction of the transverse rib 102. The upper mold of the injection molding machine mold also has lead wire half-hole lines with the same structure. The frame 101 and the transverse rib 102 half-hole lines, when the upper mold and the lower mold are closed, can form a complete grid model injection space.

[0071] The upper mold of the injection molding machine moves downward to close with the lower mold, forming a cavity with injection holes containing composite lead wires 103 arranged in parallel and embedded within the lead wire holes of the injection molding machine mold. A frame 101 and transverse ribs 102 are also formed within the injection molding machine mold. When the injection molding machine mold is heated and injection is initiated, injection material with a certain flow rate flows into the cavity. After cooling, an injection plate grid is obtained, which is injection molded within the injection molding machine with the composite lead wires 103, the frame 101, and the transverse ribs 102.

[0072] The injection-molded composite grid has a frame 101 and a transverse rib 102. The transverse rib 102 is used to support the frame 101 and enhance the overall strength of the frame 101.

[0073] Preferably, before mold closing, the composite lead wires 103 are arranged in parallel and staggered layers, respectively embedded in the staggered half-holes of the lower mold of the corresponding injection molding machine mold, perpendicular to the length direction of the transverse ribs 102; after mold closing, a composite lead wire 103 is formed, which is arranged in parallel and staggered layers and embedded in the lead wire holes of the injection molding machine mold; after injection molding, a set number of parallel and staggered lead wires 103 are obtained, forming a three-dimensional injection molding grid with multiple layers of composite lead wires 103. The three-dimensional grid is beneficial to current transmission and can make the current density of each part of the electrode plate 1 uniformly distributed during charging and discharging, so as to achieve current stability and low loss.

[0074] It should be noted that the outer edge of the frame 101 of the composite grid and the cross section of the transverse ribs 102 are both diamond-shaped, which can provide stable support while reducing the amount of material used in injection molding and facilitate demolding after injection molding.

[0075] The frame 101 and transverse ribs 102 of the electrode plate 1 are made of polyethylene. The polyethylene grid matrix does not participate in the chemical and electrochemical reactions throughout the battery's lifespan, reducing the expansion, corrosion, and breakage of the grid during cycle life, and enabling the grid to provide support and constraint for the active material throughout the entire cycle.

[0076] It should be noted that metal elements and fiber fillers are added to the injection-molded grid substrate during injection molding to improve the toughness and mechanical properties of the injection-molded grid, making the bond between the lead paste 104 and the grid tighter, reducing resistance, and improving current transmission efficiency.

[0077] Step 1.2: The composite grid is chemically modified into a conductor, and a lead layer is sprayed onto the surface to form a lead electrode grid;

[0078] Specifically, the injection-molded grid is immersed in a chemical plating bath to deposit a dense layer of conductive material, thereby modifying the injection-molded grid into a conductor.

[0079] The modified injection-molded grid is then used in a lead-coated equipment to uniformly attach a lead layer of a certain thickness to the surface of the electroplated layer using a high-pressure electrostatic spraying process, thus completing the lead electrode grid.

[0080] Step 1.3: Coat the plate grid frame with active material lead paste 104 to form electrode plate 1.

[0081] Electrode 1 is formed by coating an active material lead paste 104 onto a grid frame using a coating process. It is important to note that the lead paste 104 used on the positive electrode 1 and the negative electrode 1 has different compositions. Densely distributed composite lead wires 103 within the active material lead paste 104 ensure current balance, which is beneficial for current distribution during charging and discharging.

[0082] After curing, brush off the excess lead paste 104 from the frame 101, cut off the hanging ears, and the electrode plate 1 is completed.

[0083] In step 2, the electrode plate 1 and the separator 2 are assembled in the following manner:

[0084] Use AGM separator 2 to wrap the positive and negative plates in a U-shape, and then place the wrapped positive and negative plates at intervals according to different polarities.

[0085] In step 3, assembling bus 5 specifically includes:

[0086] Step 3.1: Butt weld the busbar 51;

[0087] Furthermore, the specific method for welding the busbar 51 is as follows:

[0088] Step 3.1.1: The composite lead wire 103 is immersed in flux solution to coat it with molten lead and tin;

[0089] The lead-tin solution flux is diluted at room temperature to a 20% liquid lead-tin solution.

[0090] The assembled electrode plate 1 and partition plate 2 are placed in the fixture 3 for fixation and clamping. Specifically, the fixture 3 has a movable plate 303 and a fixed plate 302. The assembled electrode plate 1 and partition plate 2 are placed in the fixed plate 302 and the movable plate 303, and the movable plate 303 is fixed using a fastening eccentric wheel 304. The electrode plate 1 and partition plate 2 between the movable plate 303 and the fixed plate 302 are clamped.

[0091] During casting and welding, the composite lead wire 103 in the electrode plate 1 is connected to the longitudinal grid 511 in the busbar grid 51. In order to better fuse the composite lead wire 103 with the longitudinal grid 511, the exposed composite lead wire 103 in the electrode plate 1 is immersed in 20% liquid lead-tin solution at 380°C for 10 seconds to coat it with a layer of liquid lead-tin solution.

[0092] Specifically, the casting and welding mold 4 has handles 401 on both sides and a grid frame of the current-collecting grid 51 in the middle. The grid frame has multiple cylindrical slots 403 for casting and welding longitudinal grid ribs 511 of the current-collecting grid 51. During casting and welding, multiple cylindrical slots 403 need to be connected to composite lead wires 103 of the same polarity. In this embodiment, the positive current-collecting grid is connected to the positive composite lead wire.

[0093] Step 3.1.2: Perform positive and negative butt welding on the busbar 51;

[0094] Specifically, it includes:

[0095] Step 3.1.2.1: Align fixture 3 with mold 4;

[0096] In the fixture 3, the composite lead wire 103, which has been soaked in flux, faces downwards in the electrode plate 1, so as to facilitate positioning with the horizontally placed mold 4 of the manifold 51 for casting and welding. Positioning pins 301 are installed at the four corners of the bottom of the fixture 3, and positioning pin holes 402 are located at the four corners of the mold 4 of the manifold 51. When the fixture 3 is placed above the mold 4 of the manifold 51, the positioning pins 301 and the positioning pin holes 402 are aligned.

[0097] Step 3.1.2.2: Heat the casting mold 4 and pour in molten lead for casting;

[0098] Heat the casting mold 4 to 480°C and pour in the molten lead.

[0099] Step 3.1.2.3: Fixture 3 and mold 4 are positioned, and the confluence grid 51 is removed from mold 4 after casting and welding.

[0100] The fixture 3 fits into the mold 4, the positioning pin 301 enters the positioning pin hole 402, and the mold 4 completes the positioning.

[0101] The mold 4 has multiple cylindrical slots 403. The length direction of each composite lead wire 103 is perpendicular to the length direction of the cylindrical slot 403. Each composite lead wire 103 is connected to the cylindrical slot 403 in the mold 4, and the center of the connection point is located at the center line of the cylindrical slot 403. After the multiple cylindrical slots 403 are cast and welded, multiple longitudinal gratings 511 are formed, so that each composite lead wire 103 is connected to the longitudinal grating 511 of each flow grid 51 after casting and welding, forming multiple flow nodes.

[0102] After the fixture 3 is fitted and positioned with the mold 4, the manifold 51 begins to be cast and welded. The mold 4 is equipped with a cooling device, and the molten welding liquid separates from the mold 4 after solidification. The casting and welding of the mesh-like manifold 51 is completed.

[0103] It should be noted that after the casting and welding is completed, the manifold 51 is separated from the mold 4. Since the cross-section of the manifold 51 is trapezoidal, the thickness changes slowly from top to bottom, forming a large draft angle over the entire height, which makes it easy to separate the mold 4 from the manifold 51 after the casting and welding is completed.

[0104] After casting and welding, the busbar 51 has multiple longitudinal ribs 511, with each composite lead wire 103 of the electrode plate 1 corresponding to one longitudinal rib 511. Each longitudinal rib 511 can independently connect to each composite lead wire 103 on the electrode plate 1, resulting in lower current conduction resistance and facilitating practical high-power applications. Compared to existing technologies that collect current from each electrode plate 1 via tabs, this embodiment uses the busbar 51 instead of tabs. The connection points between the composite lead wire 103 and the longitudinal ribs 511 form multiple collecting nodes, ensuring uniform current distribution. This allows for larger-area current collection on the side regions of each electrode plate 1, significantly improving operating efficiency under high-power conditions and enhancing the battery's charging and discharging capabilities.

[0105] A transverse rib 512 is provided in the middle part of the longitudinal rib 511 of the busbar 51 in the height direction, which can balance the current of each electrode plate 1 and prevent the busbar 5 from deforming due to the current and affecting its use.

[0106] A negative electrode busbar is cast and welded on the other side of the electrode plate 1 and the partition plate 2, forming a positive electrode busbar and a negative electrode busbar on both sides of the assembly of the electrode plate 1 and the partition plate 2; the positive electrode busbar is connected to the positive electrode composite lead wire, and the negative electrode busbar is connected to the negative electrode composite lead wire.

[0107] It should be noted that the negative electrode composite lead wire is immersed and coated with lead-tin liquid in flux solution, and the lead liquid for casting the negative electrode busbar is negative electrode casting lead liquid.

[0108] The casting and welding sequence of the positive and negative busbars can be interchanged.

[0109] Furthermore, after welding, the positive and negative electrode busbars are vertically arranged, the longitudinal grid ribs 511 are vertically arranged, and the composite lead wire 103 of the electrode plate 1 is horizontally connected to the longitudinal grid ribs 511 to form multiple horizontal channels for acid flow during battery use.

[0110] In existing technologies, after the battery is formed, current is collected through tabs positioned above the electrode plate 1. The composite lead wire 103 of the electrode plate 1 is placed vertically. During use, the acid flows along the vertical channels formed by the composite lead wire 103, with the more concentrated acid sinking and the less concentrated acid rising, resulting in obvious acid stratification. Compared to existing technologies, this embodiment replaces the tabs by symmetrically setting positive and negative current collection grids on both sides of the electrode plate 1 and separator 2 assembly; the composite lead wire 103 of the electrode plate 1 is placed horizontally, and the acid flows along the horizontal channels formed by the composite lead wire 103 during use, thus preventing acid stratification during operation.

[0111] Step 3.2: Solder the terminal post 52 and fabricate the copper core 53;

[0112] The terminal post 52 is manufactured by oxygen-acetylene welding, and the internally nested copper core 53 is prepared by die casting and lathe milling. The cylindrical part of the terminal post 52 has an external annular groove structure to facilitate insertion, removal and electrical connection.

[0113] Step 3.3: Treat the welding points between busbar 5 and the exposed lead wire by spraying glue or dipping in wax.

[0114] Treat the welding points between busbar 5 and the exposed lead wire by spraying glue or dipping in wax.

[0115] The stacked electrode groups are press-fitted and secured with heat shrink tubing.

[0116] Step 4: Assemble the battery.

[0117] Step 4.1: Check for any missing solder joints;

[0118] Check for any missing welds between the busbar 51 and the grid, and between the busbar 51 and the terminal post 52.

[0119] Step 4.2: Install the battery cells into the battery casing 6;

[0120] The battery cell is installed into the battery casing 6, and the terminal posts 52 are installed into the positive and negative holes on the top cover of the battery casing 6 according to the positive and negative terminals. Adhesive is applied to the positive and negative holes for sealing and curing, and then a sealing ring is added for sealing after curing.

[0121] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for manufacturing a composite energy storage lead-acid battery, characterized in that, Includes the following steps: Step 1: Fabricate the electrode plate (1); Step 2: Assemble the electrode plate (1) and the separator (2); Step 3: Assemble the bus (5); Step 4: Assemble the battery.

2. The manufacturing method of the composite energy storage lead-acid battery according to claim 1, characterized in that, Step 1 specifically includes: Step 1.1: Using polyethylene as the matrix, composite lead wire (103) is injection molded together with the frame (101) and transverse ribs (102) to form a composite grid; Step 1.2: The composite grid is chemically modified into a conductor, and a lead layer is sprayed onto the surface to form a lead electrode grid; Step 1.3: Coat the plate grid frame with active material lead paste (104) to form the electrode plate (1).

3. The manufacturing method of the composite energy storage lead-acid battery according to claim 2, characterized in that, The injection-molded composite grid in step 1.1 includes: The formed composite lead wires (103) are arranged in parallel and embedded in the lead wire half-hole line of the lower mold of the injection molding machine. The lead wire half-hole line is perpendicular to the length direction of the transverse rib (102) in the injection frame (101). The upper mold and the lower mold of the injection molding machine are closed to form a complete plate grid model injection space. After injection cooling, the injection plate grid is formed. The outer edge of the frame (101) and the cross section of the transverse ribs (102) of the composite grid are both rhomboid in shape to separate them from the injection mold.

4. The manufacturing method of the composite energy storage lead-acid battery according to claim 1, characterized in that, Step 3 specifically includes: Step 3.1: Butt weld the busbar grid (51); Step 3.2: Solder the terminal posts (52) and fabricate the copper core (53); Step 3.3: Treat the welding points between the busbar (5) and the exposed lead wire by spraying glue or dipping in wax.

5. The method for manufacturing a composite energy storage lead-acid battery according to claim 4, characterized in that, Step 3.1 specifically includes: Step 3.1.1: The composite lead wire (103) is immersed in flux solution to coat it with molten lead and tin; Step 3.1.2: Perform positive and negative butt welding on the busbar (51).

6. The method for manufacturing a composite energy storage lead-acid battery according to claim 5, characterized in that, Step 3.1.2 specifically includes: Step 3.1.2.1: Align the fixture (3) with the mold (4); Step 3.1.2.2: Heat the casting mold (4) and pour in the molten lead casting solution; Step 3.1.2.3: The fixture (3) and the mold (4) are positioned. After the casting and welding are completed, the manifold (51) is removed from the mold (4).

7. The method for manufacturing a composite energy storage lead-acid battery according to claim 6, characterized in that, The positioning of the fixture (3) and mold (4) in step 3.1.2.3 includes: The fixture (3) fits into the mold (4), the positioning pin (301) enters the positioning pin hole (402), and the mold (4) completes positioning.

8. The method for manufacturing a composite energy storage lead-acid battery according to claim 6, characterized in that, The specific method by which the confluence grid (51) detaches from the mold (4) in step 3.1.2.3 is as follows: A cooling device is provided in the mold (4) so ​​that the molten welding liquid separates from the mold (4) after solidification.

9. The method for manufacturing a composite energy storage lead-acid battery according to claim 6, characterized in that, After the casting welding is completed in step 3.1.2.3, the solidification of the casting welding liquid and its separation from the mold (4) includes: The cross section of the confluence grid (51) is trapezoidal, and the thickness changes slowly at the top and bottom, forming a large draft angle, which separates the confluence grid from the mold.

10. The method for manufacturing a composite energy storage lead-acid battery according to claim 6, characterized in that, Step 3.1.2.3 specifically includes: After the casting and welding are completed, a positive electrode busbar and a negative electrode busbar are formed on both sides of the assembly of the electrode plate and the separator; the positive electrode busbar is connected to the positive electrode lead wire, and the negative electrode busbar is connected to the negative electrode lead wire.

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