A manufacturing method of a powder lead alloy grid with a conductive plate core

Abstract

The present invention discloses a manufacturing method of a powder lead alloy grid plate with a conductive plate core, aiming to solve the deficiencies of the existing lead alloy grid plate, such as low charge and discharge efficiency, easy heating, and easy polarization due to large resistance. The present invention solves the above technical problems through the following technical solutions: including the following steps: making lead or lead alloy into lead metal powder; first putting the made lead metal powder into the lower mold; laying the conductive plate core in the lower mold containing lead metal powder; second, putting lead metal powder in the lower mold again so that the conductive plate core can be completely covered by the metal powder; compacting the lead metal powder and the conductive plate core to form a grid plate body; sintering the compacted grid plate body. By arranging the conductive plate core in the grid plate body composed of lead metal powder, the present invention improves the conductivity of the grid plate body while maintaining the performance of the original lead alloy grid plate.

Description

Technical Field

[0001] The present invention relates to the technical field of lead-acid batteries, and more specifically, it relates to a manufacturing method of a powder lead alloy grid with a conductive plate core. Background Art

[0002] Lead-acid batteries are widely used in many fields because they are relatively inexpensive compared to other batteries, have low manufacturing costs, and high active safety.

[0003] Lead-acid energy storage batteries have characteristics such as a long cycle life and strong charge acceptance ability. However, in the battery, the current collectors of both the positive and negative electrodes are metallic lead or lead alloy, and their resistance is 12 times that of copper and 9 times that of aluminum. This poses a great obstacle to the high-current charging and discharging of lead-acid batteries. High-current charging and discharging will cause the grid to heat up and partial polarization of the grid, reducing the charging efficiency and lengthening the charging time. To avoid the occurrence of such problems, it is generally possible to solve them by increasing the cross-sectional area of the grid ribs. However, thickening the grid ribs of the battery directly leads to a significant increase in the weight of the positive and negative grids, and causes a substantial increase in the overall cost of the battery.

[0004] In lead-acid or lead-carbon batteries, due to frequent charge-discharge reactions in the positive grid, the grid alloy has limited strength, and as the number of charge-discharge cycles increases, adverse reactions such as grid growth and creep will occur in the grid. Eventually, it will cause short circuits due to grid fracture and deformation.

[0005] Chinese Patent Publication No. CN101875104B, publication date January 25, 2012, invention name is a grid preparation method. This application discloses a grid manufacturing method, which includes the following steps: (1) preparing a liquid lead-based alloy; (2) pouring the liquid lead-based alloy obtained in step (1) into the cavity of a grid mold made of nickel-based alloy; (3) cooling: using vaporized water for cooling; (4) demolding. The present invention is mainly used for preparing battery grids. It solves the existing problems. The above application uses a liquid lead alloy to manufacture the grid. Since the grid manufactured mainly uses lead alloy materials, there are still problems such as easy heating and polarization of the grid due to the large resistance of lead, and thus adverse phenomena such as creep are likely to occur in the grid after long-term use. Summary of the Invention

[0006] The present invention overcomes the deficiencies in the prior art that the lead alloy grid has low efficiency during charge and discharge due to large resistance, is prone to heating during charge and discharge, and partial grids are prone to polarization, and provides a manufacturing method of a powder lead alloy grid with a conductive plate core, which can reduce the resistance of the lead alloy grid and improve the electrical conductivity of the lead alloy grid.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions: A manufacturing method of a powder lead alloy grid plate with a conductive plate core, comprising the following steps:

[0008] Step 1: Make lead metal powder from lead or lead alloy;

[0009] Step 2: Put the made lead metal powder into the lower mold for the first time;

[0010] Step 3: Lay the conductive plate core in the lower mold filled with lead metal powder;

[0011] Step 4: Put lead metal powder into the lower mold for the second time so that the conductive plate core can be completely covered by the metal powder;

[0012] Step 5: Mate the upper mold with the lower mold and compact the lead metal powder and the conductive plate core to form a grid plate body;

[0013] Step 6: Sinter the compacted grid plate body.

[0014] By arranging the conductive plate core in the grid plate body composed of lead metal powder, the present invention improves the conductivity of the grid plate body while maintaining the performance of the original lead alloy grid plate, increasing the conductivity of the grid plate body by more than 3 times, greatly reducing the resistance of the grid plate body, and effectively reducing the phenomena of easy heating and polarization caused by the large resistance of the lead alloy grid plate; it greatly increases the large current charge and discharge performance of the assembled battery, significantly reduces the heat generation of the overall assembled battery, improves the charge and discharge energy efficiency of the battery as a whole, and reduces energy consumption.

[0015] Preferably, the pressure of the upper mold pressing down on the lower mold is: 5 kg / cm 2 to 20 kg / cm 2 .

[0016] With the above pressure, it can prevent the conductive plate core from being damaged due to excessive pressure, and at the same time make the lead metal powder more compacted.

[0017] Preferably, the material of the conductive plate core is metal copper or graphene conductive film or copper alloy or aluminum or aluminum alloy.

[0018] The above several materials have good electrical conductivity and can significantly improve the electrical conductivity of the grid plate body.

[0019] Preferably, the sintering temperature is between 310 degrees Celsius and 330 degrees Celsius; the sintering time is between 10 minutes and 20 minutes.

[0020] The above sintering time and sintering temperature make the sintered grid plate body more firm, and at the same time can reduce the influence of high temperature on the conductive plate core.

[0021] Preferably, the lower die is provided with a pressing groove, and the upper die is provided with a pressing strip that cooperates with the pressing groove.

[0022] Through the cooperation of the pressing groove and the pressing strip, it is convenient to press the lead metal powder and the high-conductivity voltage tightly into the grid body.

[0023] Preferably, an installation groove is provided on the upper die, the pressing strip is arranged in the installation groove, floating cavities are arranged on both sides in the width direction of the installation groove, and floating plates that cooperate with the floating cavities are horizontally arranged on both sides in the width direction above the pressing strip; the width of the installation groove is greater than the width of the pressing strip.

[0024] When the upper die and the lower die cooperate, errors will occur when the pressing groove and the pressing strip cooperate, making it difficult for the upper die and the lower die to cooperate. Therefore, by setting the floating plate and the floating cavity, when the upper die and the lower die cooperate to compact the grid body, the pressing plate can move in the floating cavities on both sides, so that the pressing strip can better cooperate with the pressing groove.

[0025] Preferably, vertical holes are provided in the upper die, the vertical holes are vertically arranged on both sides of the pressing strip, the vertical holes communicate the floating cavity with the outside, sliding rods are arranged in the vertical holes, one end of the sliding rod is located in the floating cavity, the other end of the sliding rod is arranged outside the vertical hole, an abutting platform is arranged in the circumferential direction of the sliding rod, a cylindrical groove is arranged in the circumferential direction of the vertical hole, the abutting platform is slidably arranged in the cylindrical groove, a spring is arranged in the cylindrical groove, one end of the spring abuts against the abutting platform, and the other end of the spring abuts against the side of the cylindrical groove away from the lower die; a connection channel is provided on the upper die, and the connection channel communicates the floating cavities on both sides in the width direction of the installation groove; the position where the connection channel communicates with the floating cavity is the connection port; an abutting head is arranged above the sliding rod, and the position of the abutting head corresponds to the connection port; hydraulic oil is arranged in the connection channel and the floating cavity.

[0026] After the pressing strip and the pressing groove are well-matched, because the floating cavity and the floating plate are movably connected, the upper die and the lower die are fixedly connected, and there are gaps on both sides in the width direction between the pressing strip and the pressing groove, so that during the sintering process, the grid body expands due to heating, causing the pressing strip to move in the width direction in the pressing strip. And because the toughness of the high-conductive new plate core (such as graphene) is low and the texture is brittle, it is easy to break, so that the conductive plate core is easy to break under the action of the pressing strip, affecting the quality of the finished grid body.

[0027] To mitigate the above-mentioned impacts, two floating cavities are connected through a connecting channel, and hydraulic oil is provided in the floating cavities and the connecting channel. When the upper die and the lower die are in contact with each other, the lower die acts on the sliding rod and pushes the sliding rod upward, so that the abutting head of the sliding rod abuts against the connecting port. The abutting head blocks the connecting port, forming a closed cavity in the floating cavity. The hydraulic oil in the floating cavity plays a limiting role on the floating plate, preventing the pressing strip from sliding along the two floating cavities, and fixing the pressing strip in the pressing groove, thereby preventing the occurrence of the above-mentioned adverse situations. After sintering is completed, after the upper die and the lower die are separated from each other, the sliding rod moves downward under the action of the spring, so that the abutting head on the sliding rod disengages from the connecting port, and the two floating cavities are reconnected through the connecting channel, enabling the pressing strip to move along the direction of the floating cavity again, facilitating the cooperation between the pressing strip and the pressing groove in the next operation.

[0028] Preferably, the upper end of the abutting head is set in a frustum shape, and a tapered surface matching the abutting head is provided in the circumferential direction of the connecting port.

[0029] The cooperation between the tapered surface and the abutting head makes the cooperation between the abutting head and the connecting port tighter, enabling the tapered surface and the abutting head to block the connecting port.

[0030] Preferably, an upward concave upper concave opening is provided below the pressing strip, a downward concave lower concave opening is provided at the bottom of the pressing groove, and inclined surfaces are provided on both sides of the upper concave opening, and the inclined surfaces cooperate with the lower concave opening.

[0031] The provision of the inclined surfaces not only facilitates the formation of a cavity for placing the grid plate body in cooperation with the lower concave opening, but also plays a guiding role when the pressing strip and the pressing groove are in cooperation, enabling better cooperation between the pressing strip and the pressing groove.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) By arranging the conductive plate core in the grid plate body composed of lead metal powder, the present invention improves the conductivity of the grid plate body while maintaining the performance of the original lead alloy grid plate, greatly reduces the resistance of the grid plate body, and effectively reduces the phenomena of heat generation and polarization prone to occur due to the large resistance of the lead alloy grid plate.

[0034] (2) By providing the upper die and the lower die, the quality of the manufactured grid plate body is better and the manufacturing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic diagram of the operation method of the present invention;

[0036] Figure 2 is a schematic diagram of the mold of the present invention;

[0037] Figure 3 are partial cross-sectional views of the upper mold and the lower mold of the present invention;

[0038] Figure 4 is Figure 3 a partially enlarged view in

[0039] Figure 5 is the mating structure diagram of the upper mold and the lower mold of the present invention;

[0040] In the figure: 1. Lower mold, 11. Groove, 111. Lower notch;

[0041] 2. Upper mold, 21. Press strip, 211. Floating plate, 212. Upper notch, 213. Inclined surface, 22. Installation groove, 23. Floating cavity, 24. Vertical hole, 241. Cylindrical groove, 25. Sliding rod, 251. Abutting table, 252. Abutting head, 26. Spring, 27. Connection channel, 271. Connection port;

[0042] 3. Metal powder, 4. Conductive plate core. Specific embodiments

[0043] The technical solutions of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings:

[0044] Example 1: Referring to Figure 1 as shown, a manufacturing method of a powder lead alloy grid with a conductive plate core includes the following steps:

[0045] Step 1: Lead or lead alloy is made into lead metal powder 3;

[0046] Step 2: The prepared lead metal powder 3 is first placed into the lower mold;

[0047] Step 3: The conductive plate core 4 is laid in the lower mold 1 containing lead metal powder;

[0048] Step 4: The lower mold 1 is filled with lead metal powder 3 for the second time so that the conductive plate core 4 can be completely covered by the metal powder;

[0049] Step 5: The upper mold 2 is mated with the lower mold 1 to compact the lead metal powder 3 and the conductive plate core 4 to form a grid body;

[0050] Step 6: The compacted grid body is sintered.

[0051] The pressure of the upper mold pressing down on the lower mold is: 5 kg / cm2 to 20 kg / cm2.

[0052] The sintering temperature is between 310 degrees Celsius and 330 degrees Celsius; the sintering time is 10 minutes to 20 minutes.

[0053] The material of the conductive plate core 4 is metallic copper, graphene conductive film, copper alloy, aluminum or aluminum alloy.

[0054] In the present invention, by disposing the conductive plate core 4 in the grid plate body composed of lead metal powder, the conductivity of the grid plate body is improved while maintaining the performance of the original lead alloy grid plate. The conductivity of the grid plate body is increased by more than 3 times, greatly reducing the resistance of the grid plate body, effectively reducing the phenomena of heat generation and polarization easily occurring due to the large resistance of the lead alloy grid plate; the large current charge and discharge performance of the assembled battery is greatly increased, the heat generation of the overall assembled battery is significantly reduced, the charge and discharge energy efficiency of the battery as a whole is improved, and the energy consumption is reduced.

[0055] Example 2: Refer to Figures 2 to 5 As shown, this embodiment is similar in structure to Embodiment 1. The difference lies in that specific improvements are made to the structures of the upper die 2 and the lower die 1. Specifically:

[0056] The lower die 1 is provided with a pressing groove 11, and the upper die 2 is provided with a pressing strip 21 that cooperates with the pressing groove 11. An upward concave upper notch 212 is provided below the pressing strip 21, a downward concave lower notch 111 is provided at the bottom of the pressing groove 11, and inclined surfaces 213 are provided on both sides of the upper notch 212, and the inclined surfaces 213 cooperate with the lower notch 111.

[0057] An installation groove 22 is provided on the upper die 2, the pressing strip 21 is disposed in the installation groove 22, floating cavities 23 are provided on both sides in the width direction of the installation groove 22, and floating plates 211 that cooperate with the floating cavities 23 are horizontally provided on both sides in the width direction above the pressing strip 21. A sliding connection is provided between the floating cavities 23 and the floating plates 211; the width of the installation groove 22 is greater than the width of the pressing strip 21.

[0058] In this embodiment, when different upper dies 2 and different lower dies 1 are matched, due to the casting accuracy problem of the upper die 2 and the lower die 1, an error will occur when the pressing groove 11 and the pressing strip 21 are matched, making it difficult to match between the upper die 2 and the lower die 1. Therefore, the matching speed between the upper die 2 and the lower die 1 is affected. In order to make the matching between the upper die 2 and the lower die 1 more convenient, floating plates 211 and floating cavities 23 are provided. When the upper die 2 and the lower die 1 cooperate to compact the grid plate body, the inclined surfaces 213 and the pressing groove 11 cooperate to play a guiding role for the pressing strip 21 and the pressing groove 11. The floating plates 211 can move in the floating cavities 23 on both sides, enabling the pressing strip 21 and the pressing groove 11 to be quickly matched, thereby improving the matching speed between the upper die 2 and the lower die 1 and improving the production efficiency.

[0059] Example 3: Refer to Figures 2 to 5As shown in the figure, this embodiment is similar in structure to Embodiment 2. The difference is that there is a sliding connection between the floating cavity 23 and the floating plate 211, and a sealing fit is provided between the floating plate 211 and the floating cavity 23, so that the floating cavity 23 forms a closed cavity. A vertical hole 24 is provided in the upper mold 2. The vertical hole 24 is vertically arranged on both sides of the pressure strip 21. The vertical hole 24 communicates the floating cavity 23 with the outside. A sliding rod 25 is arranged in the vertical hole 24. The upper end of the sliding rod 25 is located in the floating cavity 23, and the lower end of the sliding rod 25 is arranged outside the vertical hole 24. An abutting platform 251 is arranged in the circumferential direction of the sliding rod 25. A cylindrical groove 241 is arranged in the circumferential direction of the vertical hole 24. The abutting platform 251 is slidably arranged in the cylindrical groove 241. A spring 26 is arranged in the cylindrical groove 241. One end of the spring 26 abuts against the abutting platform 251, and the other end of the spring 26 abuts against the side of the cylindrical groove 241 away from the lower mold 1; A connection channel 27 is arranged on the upper mold 2. The connection channel 27 communicates the floating cavities 23 on both sides in the width direction of the installation groove 22; The position where the connection channel 27 communicates with the floating cavity 23 is the connection port 271; An abutting head 252 is arranged above the sliding rod 25. The position of the abutting head 252 corresponds to that of the connection port 271; Hydraulic oil is arranged in the connection channel 27 and the floating cavity 23.

[0060] The working principle of this embodiment is as follows: After the pressure strip 21 and the pressure groove 11 are matched well, because the floating cavity 23 and the floating plate 211 are movably connected, the upper mold 2 and the lower mold 1 are fixedly connected, and there are gaps on both sides in the width direction between the pressure strip 21 and the pressure groove 11. During the sintering process, due to the acting force of thermal expansion of the grid plate body, a movement in the width direction occurs in the pressure strip 21. And because the toughness of the high-conductivity new plate core (such as graphene) is low and the texture is brittle, it is easy to break. As a result, the conductive plate core is prone to break due to the movement of the pressure strip 21 in the width direction, affecting the conductive effect of the conductive plate core and thus the quality of the finished grid plate body.

[0061] To reduce the above influence and improve the quality of the grid plate finished product, the two floating cavities 23 are connected through the connection channel 27, and hydraulic oil is arranged in the floating cavity 23 and the connection channel 27, such as Figure 5As shown, when the upper mold 2 and the lower mold 1 are fitted together, the lower mold 1 acts on the sliding rod 25, and the lower mold 1 pushes the sliding rod 25 upward, so that the abutting head 252 of the sliding rod 25 abuts against the connection port 271. The abutting head 252 blocks the connection port 271, forming a closed cavity in the floating cavity 23. The hydraulic oil in the floating cavity 23 limits the floating plate 211, so that the pressing strip 21 cannot slide along the two sides of the floating cavity 23, and the pressing strip 21 is fixed in the pressing groove 11, thereby preventing the occurrence of the above-mentioned adverse conditions and effectively ensuring the quality of the grid plate body after sintering. After sintering is completed, after the upper mold 2 and the lower mold 1 are separated from each other, the sliding rod 1 moves downward under the action of the spring 26, so that the abutting head 252 on the sliding rod 25 disengages from the connection port 271, and the two sides of the floating cavity 23 are reconnected through the connection channel 27, enabling the pressing strip 21 to move along the direction of the two sides of the floating cavity 23 again, facilitating the cooperation between the pressing strip 21 and the pressing groove 11 next time.

[0062] The upper end of the abutting head 252 is set to be frustum-shaped, and a tapered surface matching the abutting head 252 is provided in the circumferential direction of the connection port 271.

[0063] The tapered surface cooperates with the abutting head 252, making the cooperation between the abutting head 252 and the connection port 271 closer, so that the connection port 271 can be blocked between the tapered surface and the abutting head 252.

[0064] The above-described embodiments are only preferred solutions of the present invention, and do not impose any form of limitation on the present invention. There are other variations and modifications without exceeding the technical solutions described in the claims.

Claims

1. A manufacturing method of a powder lead alloy grid with a high-conductivity plate core, characterized in that, It includes the following steps: Step 1: Make lead metal powder from lead or lead alloy. Step 2: First, put the made lead metal powder into the lower mold. Step 3: Lay the conductive plate core in the lower mold filled with lead metal powder. Step 4: Second, put lead metal powder in the lower mold again so that the conductive plate core can be completely covered by the lead metal powder. Step 5: Mate the upper mold with the lower mold and compact the lead metal powder and the conductive plate core to form a grid body. Step 6: Sinter the compacted grid body. An installation groove is provided on the upper mold, a pressing strip is arranged in the installation groove, floating cavities are arranged on both sides in the width direction of the installation groove, and a floating plate is arranged above the pressing strip and is matched with the floating cavity. Vertical holes communicating with the floating cavities and the outside are provided in the upper mold, sliding rods are arranged in the vertical holes, and springs for pushing the sliding rods to move towards the outside are arranged in the vertical holes. A connecting channel communicating with the two floating cavities is provided on the upper mold, the position where the connecting channel communicates with the floating cavity is a connecting port; a butt joint head is arranged above the sliding rod, and the position of the butt joint head corresponds to that of the connecting port; hydraulic oil is arranged in the connecting channel and the floating cavities.

2. The manufacturing method of the powder lead alloy grid with a highly conductive plate core according to claim 1, characterized in that, in In step five, the pressure exerted by the upper mold on the lower mold is: 5 kg / cm 2 to 20 kg / cm 2 .

3. The manufacturing method of the powder lead alloy grid with a high-conductivity plate core according to claim 1, characterized in that, The material of the conductive plate core is metal copper, graphene conductive film, copper alloy, aluminum or aluminum alloy.

4. The manufacturing method of the powder lead alloy grid with a high-conductivity plate core according to claim 1, characterized in that, The sintering temperature is between 310 °C and 330 °C; the sintering time is between 10 minutes and 20 minutes.

5. The manufacturing method of the powder lead alloy grid with a high-conductivity plate core according to claim 1, characterized in that, The lower mold is provided with a pressing groove, and the upper mold is provided with a pressing strip matched with the pressing groove.

6. According to the manufacturing method of the powder lead alloy grid with a high-conductivity plate core as described in any one of claims 1 to 5, the width of the installation groove is greater than the width of the pressing strip, and the floating plate is arranged on the horizontal sides in the width direction of the pressing strip.

7. The manufacturing method of the powder lead alloy grid with a highly conductive plate core according to claim 1, characterized in that, The vertical holes are vertically arranged on both sides of the pressing strip, one end of the sliding rod is located in the floating cavity, the other end of the sliding rod is arranged outside the vertical hole, an abutting platform is arranged in the circumferential direction of the sliding rod, a cylindrical groove is arranged in the circumferential direction of the vertical hole, the abutting platform is slidably arranged in the cylindrical groove, and a spring is arranged in the cylindrical groove. One end of the spring abuts against the abutting platform, and the other end of the spring abuts against the side of the cylindrical groove away from the lower mold.

8. The manufacturing method of the powder lead alloy grid with a highly conductive plate core according to claim 7, characterized in that, The upper end of the butt joint head is set to be frustum-shaped, and a tapered surface matched with the butt joint head is arranged in the circumferential direction of the connecting port.

9. The manufacturing method of the powder lead alloy grid with a high-conductivity plate core according to claim 5, characterized in that, An upward concave upper concave opening is arranged below the pressing strip, a downward concave lower concave opening is arranged at the bottom of the pressing groove, inclined surfaces are arranged on both sides of the upper concave opening, and the inclined surfaces are matched with the lower concave opening.

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