CN114210118B

CN114210118B - Production method of aluminum foil for low-pinhole power battery

Info

Publication number: CN114210118B
Application number: CN202111507185.1A
Authority: CN
Inventors: 王海庆; 曾杰江; 刘伟; 钟小林; 滕春丰; 牛培琪
Original assignee: Hangzhou Five Star Aluminium Co ltd
Current assignee: Hangzhou Five Star Aluminium Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2023-03-28
Anticipated expiration: 2041-12-10
Also published as: CN114210118A

Abstract

The invention provides a production method of an aluminum foil for a low-pinhole power battery, which is characterized in that a filtering component is arranged in a tubular filter, when a filtering hole in a first filtering pipe is blocked by impurities in an aluminum solution, because the pressure in a first cavity rises, a sliding plate is pushed and a first filtering unit is driven to move towards a direction departing from the first cavity until a circular truncated cone in the first filtering unit contacts with a trigger mechanism on a pressure storage pipe, so that the circular truncated cone is separated from a contact part on the sliding plate, the first filtering unit rapidly moves towards the first cavity under the action of a first spring, and a first filtering ring can remove the impurities attached to the filtering hole of the first filtering pipe in the process, so that the first filtering pipe is not blocked any longer, filtering consumables such as a filtering pipe do not need to be replaced, the service life of the filtering pipe is prolonged, the maintenance process of the filtering device is simplified, and the production cost of the aluminum foil is reduced.

Description

Production method of aluminum foil for low-pinhole power battery

Technical Field

The invention relates to the technical field of battery production, in particular to a production method of an aluminum foil for a low-pinhole power battery.

Background

The aluminum foil for the battery is an aluminum foil product applied to producing various batteries, and the battery foil product is mainly applied to the fields of mobile phone batteries, automobile battery batteries and the like. The product is different from the aluminum foil product of common use, and the product is required to have high conductivity, high strength and good surface quality. At present, domestic high-grade battery foil products mainly depend on import. With the rapid development of electronic industries at home and abroad, the usage amount of the battery foil is increased year by year, and the battery foil becomes another important variety of aluminum foil products in future.

As lithium batteries are developed towards high energy density, aluminum foils also face various severe challenges, wherein "pinholes" have become a standard for measuring the development level of various enterprises processing aluminum foils; for aluminum foil products, this defect of pinholes is unavoidable and is the primary defect of aluminum foil. The main causes of pinholes are the large diameter of compounds in the blank, the large amount of slag inclusion, the large roughness of the working roll in the rolling process, the insufficient filtering precision of rolling oil or the leakage of a filtering medium in an essential oil tank, the poor rolling environment and a large amount of foreign matters. Then filter the aluminium water before the aluminium foil is cast and rolled and can reduce the impurity in the aluminium water, and then can reduce the pinhole rate in the aluminium foil production process, improve production quality. And current filter equipment is mostly to take place to block up the back at the filtration consumptive material and change the filtration consumptive material, very big increase manufacturing cost.

Disclosure of Invention

The invention provides a production method of an aluminum foil for a low-pinhole power battery, which aims to solve the problem of overhigh cost caused by replacement of filter consumables in the existing battery aluminum foil production.

The production method of the aluminum foil for the low-pinhole power battery provided by the embodiment of the invention sequentially comprises the following steps of:

smelting, casting and rolling, cold rolling, intermediate annealing, aluminum foil blank forming, rough rolling, intermediate rolling and finish rolling;

wherein a tubular filtration step is included between the melting and the casting, the tubular filtration step being performed within a tubular filter comprising:

the box body is provided with a feeding hole at one end, and a discharging hole at one end, far away from the feeding hole, of the box body;

filter equipment, filter equipment set up in inside and being located of box the feed inlet with between the discharge gate, filter equipment includes closing plate, first filter tube and first slagging-off subassembly:

the sealing plate is provided with a communicating hole, and the first filtering pipe is provided with a filtering hole; the sealing plate, the first filtering pipe and the box body are enclosed to form a first cavity communicated with the feeding hole and a second cavity communicated with the discharging hole, and the first cavity and the second cavity are subjected to material exchange through the filtering holes;

the first deslagging assembly comprises a pressure storage pipe, a sliding plate, a first filtering unit and a first spring, the interior of the pressure storage pipe is communicated with the first cavity, the sliding plate is arranged in the pressure storage pipe in a sliding mode, one end of the sliding plate extends out of the pressure storage pipe to form a protruding part, and the protruding part is located in the second cavity; the first filtering unit comprises a circular table, a first connecting rod and a first filtering ring which are fixedly connected into a whole, the first connecting rod can be slidably arranged through the sealing plate in a penetrating manner, the circular table is elastically connected to the sealing plate through the first spring and is positioned in the second cavity, and the first spring always enables the circular table to move towards the sealing plate or has a tendency of moving towards the sealing plate; the first filtering ring is sleeved outside the first filtering pipe; the circular table has a first position and a second position, the circular table is always in the first position or has a tendency to move to the first position; the pressure storage tube is provided with a trigger mechanism, the trigger mechanism enables the circular truncated cone to move from the first position to the second position, the protruding portion abuts against the circular truncated cone and can drive the circular truncated cone to move in the direction departing from the sealing plate when the pressure storage tube is located at the first position, and the circular truncated cone is not in contact with the protruding portion when the pressure storage tube is located at the second position.

In the embodiment of the present invention, the sealing plate further includes a second filtering pipe embedded in the first filtering pipe, the second filtering pipe is provided with a pipe orifice and filtering holes, and the pipe orifice abuts against the sealing plate.

In the embodiment of the invention, the device further comprises a second deslagging assembly, the second deslagging assembly comprises a second filtering unit, the second filtering unit comprises a second connecting rod and a second filtering ring which are fixedly connected into a whole, the second connecting rod slidably penetrates through the sealing plate, one end of the second connecting rod abuts against the circular truncated cone, and the second filtering ring is arranged between the first filtering pipe and the second filtering pipe.

In the embodiment of the invention, the second deslagging assembly further comprises a turnover plate and two inclined slide blocks, the turnover plate is arranged at the pipe orifice and can slide along the axial direction of the second filtering pipe, the turnover plate rotates in the sliding process, and the turnover plate seals or opens the pipe orifice before and after rotating; the second connecting rod is provided with a transverse groove and a longitudinal groove which are mutually communicated, the sealing plate is provided with a sliding block groove, the inclined sliding block comprises a main body part and a sliding part, the sliding part is positioned in the transverse groove or the longitudinal groove, the main body part is positioned in the sliding block groove, one side face, opposite to the two inclined sliding blocks, of the main body part is an inclined face, the circumferential outer side face of the turnover plate is convexly provided with a butting column, and the butting column is butted against the inclined faces of the two inclined sliding blocks simultaneously.

In an embodiment of the present invention, the second slag removing assembly further includes a fixing ring and a round bar, the round bar is fixedly disposed at an axis of the second filtering pipe, the fixing ring is slidably sleeved on the round bar and is disposed near the pipe orifice, the number of the turning plates is plural, and the plural turning plates are disposed between the round bar and the fixing ring.

In the embodiment of the invention, the round rod is provided with a second spring, and the second spring always enables the fixed ring and the turnover plate to move towards the first cavity or has a tendency to move along the first cavity.

In the embodiment of the invention, the sealing plate is provided with a flow baffle, and the flow baffle is arranged at the pipe orifice and is positioned in the second cavity.

In the embodiment of the invention, the turnover plate rotates clockwise or counterclockwise.

In an embodiment of the present invention, the trigger mechanism includes a first trigger inclined surface, a second trigger inclined surface is disposed on the circular truncated cone, and when the circular truncated cone contacts the trigger mechanism, the first trigger inclined surface pushes the second trigger inclined surface and moves the circular truncated cone from the first position to the second position.

In an embodiment of the invention, a third spring is arranged in the pressure storage tube, which third spring always causes the slide plate to move towards the first chamber or has a tendency to move.

According to the production method of the aluminum foil for the low-pinhole power battery, disclosed by the embodiment of the invention, the filtering component is arranged in the tubular filter, when the filtering holes in the first filtering pipe are blocked by impurities in an aluminum solution, due to the fact that the pressure in the first cavity rises, the sliding plate is pushed and the first filtering unit is driven to move towards the direction departing from the first cavity until the circular table in the first filtering unit is contacted with the trigger mechanism on the pressure storage pipe, the protruding part on the circular table and the sliding plate are separated from contact, the first filtering unit rapidly moves towards the first cavity under the action of the first spring, and in the process, the first filtering ring can remove the impurities attached to the filtering holes of the first filtering pipe, so that the first filtering pipe is not blocked any more, filtering consumables such as the filtering pipe do not need to be replaced, the service life of the filtering pipe is prolonged, the maintenance process of the filtering device is simplified, and the production cost of the aluminum foil is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a process flow diagram of a method for producing an aluminum foil for a low pinhole power battery according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a tube filter in a method for producing an aluminum foil for a low-pinhole power battery according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a candle filter in a method of producing aluminum foil for low pinhole power cells in accordance with an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a filtering device in a tubular filter in the method for producing an aluminum foil for a low-pinhole power battery according to an embodiment of the present invention;

fig. 5 is a schematic view showing a part of the structure of a filter unit in a tube filter in the method for manufacturing an aluminum foil for a low-pinhole power battery according to an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the filter assembly of FIG. 5;

FIG. 7 is an enlarged view of a portion of the filter assembly of FIG. 6;

FIG. 8 is an enlarged view of another portion of the filter assembly of FIG. 6;

fig. 9 is a schematic structural diagram of a second filter unit in the filter device in the method for producing the aluminum foil for the low-pinhole power battery according to the embodiment of the invention;

fig. 10 is a schematic view showing a part of the structure of a filter unit in a tube filter in the method for manufacturing an aluminum foil for a low-pinhole power battery according to an embodiment of the present invention;

fig. 11 is a partial schematic structural view of a second deslagging assembly in the filtering device in the method for producing the aluminum foil for the low-pinhole power battery according to the embodiment of the invention;

fig. 12 is a schematic structural diagram of parts of a slanting slider in a filtering device in the production method of the aluminum foil for the low-pinhole power battery according to the embodiment of the invention.

Reference numerals:

a housing 10; a feed port 101; a discharge port 102; a waste port 103; legs 104;

a filter device 20; a first filtering pipe 201; a second filtering pipe 202; a nozzle 202a; a sealing plate 203; the slider grooves 203a; a baffle plate 203b; a mounting groove 203c;

a first deslagging assembly 30; a pressure storage tube 310; a trigger mechanism 311; a first trigger ramp 311a; a third spring 312; a slide plate 320; the protruding portion 321; a first filtering unit 330; a circular truncated cone 331; the second trigger ramp 331b; a first connecting rod 332; a first filter ring 333; a first spring 340;

a second deslagging assembly 40; a second filter unit 410; the second connecting rod 411; the lateral slots 411a; a longitudinal slot 411b; a second filter ring 412; a flipping board 421; a fixing ring 422; a round rod 423; a second spring 424; a mounting table 425; a diagonal slider 430; a main body portion 431; the abutment slopes 431a; a sliding portion 432.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A method for producing an aluminum foil for a low-pinhole power battery according to an embodiment of the present invention will be described below with reference to fig. 1.

As shown in fig. 1, the method for producing an aluminum foil for a low-pinhole power battery of an embodiment of the present invention sequentially comprises the following steps:

smelting, casting and rolling, cold rolling, intermediate annealing, aluminum foil blank forming, rough rolling, intermediate rolling and finish rolling.

The inventor finds that the production difficulty mainly exists in the following aspects in the process course in the practical production:

1. due to the high requirements on the surface quality and the internal quality, higher demands are made on the quality of the aluminium foil stock.

2. The aluminum foil has high requirements on pinholes, so the aluminum foil has high requirements on the content of impurities and other trace elements in the aluminum water.

3. The process lubrication conditions (rollers, rolling oil) and the like in the production process of the aluminum foil need to be adjusted and optimized.

4. The parameters of the rolling production process need to be adjusted and optimized.

5. The filtering precision of the rolling oil needs to be adjusted and optimized.

6. The rolling environment needs to be adjusted and optimized, and foreign matters in the surrounding environment are reduced.

Based on this, in the above process, the following process control requirements exist:

1. production process route

1.1 casting and rolling procedure:

melt quality control

1. The furnace burden needs to be kept clean, the melt quality is good, and the production requirement of aluminum foil is met

2. Controlling the hydrogen content: not more than 0.12ml/100gAl

3. The plate filtration and the tubular filtration are adopted, the aluminum purity is improved, and the impurity content in the aluminum water is reduced

Quality control of the panel shape

1. Convexity: 0.2% -0.8%;

2. plate shape curve: parabolic shape, no wedge-shaped plate, rib thickness (concave plate) and other defects

Casting and rolling process parameters

1. Casting and rolling speed: 750-1000mm/min

2. Length of casting and rolling area: 55-65mm

1.2 strip working procedure

Quality control of the panel shape

(1) After the working roll is replaced each time, the preheating of the roll is maintained for more than 10 minutes, and before the finished product passes, 2-3 rolls of thick materials are produced to improve the thermal convexity of the roll and stabilize the roll shape;

(2) selecting a proper plate shape control curve according to the width of the product and the alloy variety to ensure the plate shape quality;

(3) the shape keeping control system is normal: when the supporting roller is replaced every time, the normal states of the spraying system and the roller system are confirmed, and abnormity is found and is timely processed;

surface quality control

(1) Cleaning dust on the surface of the aluminum coil by using clean cleaning cloth before feeding, cleaning a rolling mill guide roller once by using the clean cleaning cloth in each pass, and regularly cleaning oil sludge and foreign matters on the surfaces of an inlet trolley, an outlet trolley and a walking beam trolley to keep the surfaces of the trolleys clean;

(2) roller changing is carried out according to a roller changing program strictly;

(3) before finished products are produced, sampling is carried out to determine the state of the roller and determine whether the roller meets the surface requirement of the products or not, and the products with the defects of roller marks, surface stripes and the like in batches are avoided by checking the first-roll finished products;

(4) ensuring that a rolling oil filtering system is normal so as to ensure the quality of a rolling surface;

1.3 aluminum foil Process

(1) Specification and state of the wool: 0.2-0.4mm (the specific width is determined by the contract width), 1060-H18,

(2) rolling pass reduction distribution: see table one

Table one: low pinhole double sided photovoltaic foil aluminum foil reduction pass distribution

Thickness of finished product mm	Reduction pass distribution mm
		0.013	0.26-0.12-0.052-0.021-0.013

(3) The service conditions of the finished pass roller are shown in the table II

A second table: use condition of finished gate roller of low-pinhole m double-sided photovoltaic cell foil

Thickness of finished product mm	Roller convexity thousandths	Roughness (Ra) of roller
			0.013	60-100	0.10-0.13

(4) Average pass processing rate: 51.97 percent.

2. Improvement of technological process

2.1 the alloy component proportion of the raw materials is adjusted.

The key point of the work is to adjust the alloy component proportion of the casting and rolling process, and the specific adjustment conditions are as follows:

table three: original chemical composition

Note: the content is a single value, aluminum is the lowest limit, and other impurity elements are the highest limits.

Table four: adjusted chemical composition

Compared with the prior art and the prior art, the Al content is improved, and the Fe/Si ratio is improved. AL-Fe-Si can form two ternary compounds, namely T1 (AL 12Fe2 Si) also known as alpha (AL-Fe-Si) phase and T2 (AL 9Fe2Si 2) also known as beta (Al-Fe-Si) phase. The T1 phase is bone-shaped, and the T2 phase is needle-shaped. Both the T1 and T2 phases can deteriorate the plasticity of the aluminum, but the T1 phase is relatively ideal as-cast compound, is easily broken during deformation, and is easily dissolved in the matrix during homogenization. The T2 phase is an undesirable compound, which can cause defects such as pinholes, microcracks and the like on the matrix, and the generation of the T2 phase is avoided as much as possible in the production process.

When Fe/Si is more than 1, the reaction at 629 ℃ is finished for crystallization to mainly produce a T1 phase, when Fe is less than Si, the reaction at 578 ℃ is finished for crystallization to mainly produce a T2 phase, and the effective crystallization interval is that Fe is more than Si and is reduced by 51 ℃ compared with Fe and is less than Si, so that Fe is more than Si and is beneficial to improving the fluidity, the ingot casting heat crack and the micro shrinkage porosity are favorably prevented, and the phase change property of the produced T1 is good compared with that of T2, so that the material is easier to process and form; when Fe is less than Si, the aluminum ingot is prone to generate thermal cracks and micro shrinkage porosity, and the aluminum ingot is prone to generate cracks during processing and forming. It can be seen that it is very critical to control the relative amounts of Fe and Si, so that Fe is larger than Si and the Fe/Si ratio is properly increased.

2.2 adding tubular filtration

The key point of the work is that the filtration precision of the molten aluminum in the casting and rolling process is adjusted. The specific adjustment is as follows:

a) According to the tubular filtering principle, molten aluminum entering the tubular filtering device contains various impurities, large particles are filtered by surface media of the filtering tube, small particles are adsorbed by the media inside the filtering tube, and high-quality molten metal meeting production requirements is obtained after double filtering action of the filtering tube.

The tubular filter improves three important factors of the filtering effect of the aluminum melt:

1. the pore diameter is very small;

2. the passing speed of the aluminum melt is very slow;

3. the filter tube has very high strength and the aggregate can not move.

b) Grade of filter tube

The filter tube is the main working part of the filter device. The filter tubes must be kept in a dry environment to ensure that the filter tubes are dry before use.

The tubular filter is divided into six grades of RA, RB, RC, RD, RE and RF according to the aperture of the filtered air; the purpose of each grade of the filter pipe is as follows:

type of filter tube	Products corresponding to different filtering precisions
		RA	High-grade aluminum profile
RB	Double-zero foil and pot material
		RC	Tank material, PS plate base and double-zero foil blank
RD	Colour duplicator photosensitive drum, high-grade special aluminium tube and section bar
		RE	High-grade special aluminum pipe and section bar
RF	Computer hard disk

Service life of each grade of the filter pipe is as follows:

d) Tubular filtration accuracy

The filtration tube grade in the present invention is RA grade for the following reasons:

1) The grade filtering pipe can filter impurities with the size of more than or equal to 20 mu m.

2) The filter pipe of this level is difficult to produce the filter pipe jam, is favorable to producing smoothly to go on.

2.3 further improvements were made to the working roll parameters of the production process.

In the work, the parameters of the working roll of each rolling pass are adjusted on the original basis, wherein the maximum change is the change of the index of the working roll of the rolling pass of the finished product. By reducing the roughness range of the working roll, the roughness of the working roll is convenient to accurately control, and the roughness is reduced, so that the damage to the surface of the aluminum foil and the generation of pinholes are reduced.

Table five: low pinhole double-sided photovoltaic cell foil work roll parameter adjustment

3. Compared with the prior art, the method has the main improvement points and advantages.

3.1, the mixture ratio of the alloy components of the product is adjusted

Although the original control range of the alloy components meets the national standard requirements, the control range of the main components is wider, and the stability of the product is not ensured during batch production. Therefore, the control range of the main alloy elements is further narrowed under the original condition, which is beneficial to improving the stability of the product. By adjusting and controlling the relative amount of Fe and Si, fe is more than Si, the Fe/Si ratio is properly improved, the generation of T2 phase is reduced, and the internal structure defect is reduced. Thereby reducing the number of pinholes.

3.2, the filtration precision of the molten aluminum is adjusted

The aluminium water filter fineness, original board-like filter fineness is lower, and wherein some small impurity filters and does not fall, leads to in the aluminum plate impurity content too much, is unfavorable for later stage pinhole control, increases a tubular filtration on original basis, filters the aluminium water after the board-like filtration and is carrying out the filtration of a high accuracy, and the at utmost has reduced impurity content in the aluminium water, is favorable to follow-up pinhole control.

3.3 adjusting the working roll of the aluminum foil process

The adjustment of the working roll mainly comprises the following points:

the roughness range of the roughing roll is reduced, so that the control is more accurate

The roughness of the working roll in the last pass is adjusted, and the damage of the working roll to the surface of the aluminum foil is reduced mainly according to the test production condition.

A candle filter according to an embodiment of the present invention is described below with reference to fig. 2-12.

Referring to fig. 2 and 3, a tubular filter for use in a smelting step of a method for producing an aluminum foil for a low-pinhole power battery according to an embodiment of the present invention includes a box. A feed inlet 101 is arranged at one end of the box body, a discharge outlet 102 is arranged at one end of the box body, which is far away from the feed inlet 101, and a waste material outlet 103 is arranged at the lower part of the box body, which is lower than the feed inlet 101 and the discharge outlet 102. For example, in fig. 3, the inlet 101 is disposed at the upper right of the box in the figure, the outlet 102 is disposed at the upper left of the box in the figure, and the waste port 103 is disposed at the lower left of the box in the figure. Of course, the positions of the inlet 101, the outlet 102 and the waste opening 103 are not limited to the arrangement shown in the figures, and the arrangement that the inlet 101 and the outlet 102 are located at two ends of the box body far away from each other and the arrangement that the waste opening 103 is located below the inlet 101 and the outlet 102 and close to the bottom of the box body can be applied to the invention. The base of the tank is also provided with legs 104 for supporting the tank, the number of legs 104 may be plural, such as four as shown in fig. 2.

In the embodiment of the present invention, referring to fig. 3 and 4, the tube filter further includes a filtering device 20, the filtering device 20 is disposed inside the box, and the filtering device 20 is located between the feeding inlet 101 and the discharging outlet 102.

The filtering apparatus 20 includes a sealing plate 203, a first filtering pipe 201, and a first deslagging assembly 30. The sealing plate 203 is arranged in the box body, a communication hole is formed in the sealing plate 203, a filtering hole is formed in the first filtering pipe 201, one end, communicated with the outside, of the first filtering pipe 201 abuts against the sealing plate 203, and the first filtering pipe 201 is communicated with the outside only through the filtering hole and the communication hole in the sealing plate 203. Thus, the sealing plate 203, the first filtering pipe 201 and the box body substantially enclose a first cavity communicating with the inlet 101 and a second cavity communicating with the outlet 102. For example, in fig. 3, the sealing plate 203 is horizontally disposed to substantially divide the inner space of the box body into a first box body located at the lower portion of the inner cavity of the box body and communicating with the inlet 101, and a second box body located at the upper portion of the inner cavity of the box body and communicating with the outlet 102. It should be noted that the first filtering pipe 201 is located in the first cavity, and the area inside the first filtering pipe 201 should be regarded as an independent cavity different from the first cavity and the second cavity, and the independent cavity is communicated with the first cavity through the filtering holes and the second cavity through the pipe openings. In short, the first and second cavities can be considered to exchange substances through the filtering holes on the first filtering pipe 201.

During filtering, aluminum solution enters the first cavity of the box body through the feeding hole 101, enters the independent cavity in the first filtering pipe 201 through filtering of the filtering hole in the first filtering pipe 201, flows to the second cavity from the pipe opening through the independent cavity, finally flows out from the discharging hole 102 to enter the next procedure, and aluminum solution impurities remained in the first cavity through filtering in the middle of the filtering process are discharged from the waste material hole 103.

With continued reference to fig. 3-8, first dross removal assembly 30 includes a pressure accumulator tube 310 and a skid plate 320. The pressure storage tube 310 is a hollow shell 10 with a cavity formed therein, the shell 10 is located in the second cavity, and the cavity in the shell 10 is communicated with the first cavity. For example, in fig. 6, the pressure storage tube 310 may be considered to be formed by protruding from a portion of the sealing plate 203 toward the second cavity. The sliding plate 320 is slidably disposed in the inner cavity of the pressure storage tube 310, the sliding plate 320 has an upper end portion and a lower plate portion, the cross-sectional shape of the upper end portion of the sliding plate 320 is the same as the cross-sectional shape and the size of the inner cavity of the pressure storage tube 310, that is, the inner cavity of the pressure storage tube 310 is divided into two parts which are not communicated with each other by the upper end portion of the sliding plate 320. The pressure storage pipe 310 is provided with a long through groove located in the second cavity, one side of the upper end of the sliding plate 320 extends outwards through the long through groove and forms a protruding portion 321 protruding out of the pressure storage pipe 310, the protruding portion 321 divides the long through groove into a lower side groove close to the first cavity and an upper side groove close to the second cavity, and the lower plate of the sliding plate 320 is used for sealing the lower side groove, close to the first cavity, of the long through groove on the pressure storage pipe 310. Therefore, even if the pressure storage pipe 310 is provided with the long through groove, the first cavity and the second cavity cannot exchange substances at the pressure storage pipe 310 under the sealing action of the upper end portion and the lower plate portion of the sliding plate 320.

The first deslagging assembly 30 further comprises a first filtering unit 330 and a first spring 340, wherein the first filtering unit 330 comprises a circular truncated cone 331, a first connecting rod 332 and a first filtering ring 333 which are fixedly connected into a whole. The first connecting rod 332 slidably penetrates through the sealing plate 203, and the first connecting rod 332 can slide along the first cavity toward the second cavity or along the second cavity toward the first cavity relative to the sealing plate 203. The two ends of the first connecting rod 332 are fixedly connected with a circular truncated cone 331 and a first filter ring 333 respectively, the first filter ring 333 is positioned in the first cavity, the first filter ring 333 is sleeved outside the first filter pipe 201, and the inner surface of the first filter ring 333 and the outer surface of the first filter pipe 201 can be in a matching relationship or a small gap is left; round platform 331 is located the second cavity, and round platform 331 can remove along two directions: firstly, the circular truncated cone 331 can slide along the axial direction of the circular truncated cone 331, for example, in the up-down direction in fig. 5, and secondly, the circular truncated cone 331 can move along the radial direction of the circular truncated cone 331, so that the circular truncated cone 331 can be far away from or close to the pressure storage tube 310, for example, in the left-right direction in fig. 5, and a first position close to the pressure storage tube 310 and a second position far away from the pressure storage tube 310 are correspondingly arranged before and after the circular truncated cone 331 moves along the radial direction of the circular truncated cone 331. When the sliding plate 320 moves upwards, the protruding part 321 can push the circular truncated cone 331 to move upwards synchronously; in the second position, projection 321 and boss 331 are out of contact. The first spring 340 has one end connected to the boss 331 and the other end connected to the sealing plate 203 or other fixed structure in the box body, and the elastic force of the first spring 340 always makes the boss 331 move towards the sealing plate 203 or have a tendency of the movement. It can be understood that, when the circular table 331 is in the first position, the sliding plate 320 moves upward, and drives the circular table 331 to move upward against the elastic force of the first spring 340; when the boss 331 is in the second position, the slide plate 320 and the boss 331 are out of contact, and the boss 331 moves rapidly toward the seal plate 203 under the action of the first spring 340.

The pressure storage tube 310 is further provided with a trigger mechanism 311, and the trigger mechanism 311 is located on one side of the pressure storage tube 310 facing the first filtering unit 330 and is located at one end of the pressure storage tube 310 far away from the sealing plate 203. When not acted by external force, the circular table 331 is at the first position. When the circular truncated cone 331 moves a preset distance along the axial direction of the circular truncated cone 331 and the direction away from the sealing plate 203, the circular truncated cone 331 is in contact with the trigger mechanism 311, and the circular truncated cone 331 moves from the first position to the second position under the pushing action of the trigger mechanism 311 because the trigger mechanism 311 does not move. Under the condition of no external force, the circular truncated cone 331 can be restored from the second position to the first position by means of the elasticity of the circular truncated cone 331.

In the process of filtering by the tubular filter, when the filtering holes on the first filtering pipe 201 are blocked by impurities, the pressure in the first cavity rises and is higher than the pressure in the second cavity, and the upper end of the sliding plate 320 is driven by the pressure difference to move the whole sliding plate 320 along the first cavity towards the second cavity. While the slide plate 320 moves, the protrusion 321 abuts against the lower surface (the surface facing the sealing plate 203) of the circular truncated cone 331 and causes the circular truncated cone 331 to rise synchronously. When the circular truncated cone 331 rises for a preset distance and contacts the trigger mechanism 311, the circular truncated cone 331 continues to rise for a short distance, and the circular truncated cone 331 is pushed by the trigger mechanism 311 to move from the first position to the second position, the circular truncated cone 331 is separated from the contact with the protrusion 321, rapidly moves towards the first cavity under the elastic force of the first spring 340, and synchronously drives the first filter ring 333 to slide along the surface of the first filter pipe 201. During the sliding process of the first filtering ring 333, impurities blocked at the filtering holes are removed, so that the filtering holes are conducted again. In the process of moving the circular truncated cone 331 to the first cavity, the circular truncated cone 331 returns to the first position from the second position due to the elasticity of the circular truncated cone 331; after the filter holes are not blocked, the pressures in the first cavity and the second cavity are balanced, the sliding plate 320 returns to the initial position again under the action of the self gravity, and the whole filter device 20 returns to the initial state until the filter holes are blocked next time, and the actions are repeated, so that the first filter pipe 201 is automatically cleaned.

According to the production method of the aluminum foil for the low pinhole power battery, provided by the embodiment of the invention, by arranging the filtering component in the tubular filter, when the filtering holes in the first filtering pipe 201 are blocked by impurities in the aluminum solution, due to the fact that the pressure in the first cavity rises, the sliding plate 320 is pushed and the first filtering unit 330 is driven to move in the direction away from the first cavity, until the circular table 331 in the first filtering unit 330 is in contact with the trigger mechanism 311 on the pressure storage pipe 310, so that the circular table 331 is not in contact with the protruding part 321 on the sliding plate 320, the first filtering unit 330 rapidly moves towards the first cavity under the action of the first spring 340, and in the process, the first filtering ring 333 can clear away impurities attached to the filtering holes in the first filtering pipe 201, so that the first filtering pipe 201 is not blocked any more, filtering consumables such as filtering pipes do not need to be replaced, the service life of the filtering pipe is prolonged, the maintenance process of the filtering device 20 is simplified, and the production cost of the filtering device is reduced.

In an embodiment of the present invention, referring to fig. 6, the filtering device 20 further includes a second filtering pipe 202, and the second filtering pipe 202 is embedded in the first filtering pipe 201, in other words, the first filtering pipe 201 is sleeved outside the second filtering pipe 202. The second filtering pipe 202 is provided with a pipe opening 202a and a filtering hole, one end of the second filtering pipe 202, which is communicated with the outside, abuts against the sealing plate 203, and the second filtering pipe 202 is communicated with the outside only through the filtering hole and the communication hole of the sealing plate 203. It should be noted that, when the first filtering pipe 201 and the second filtering pipe 202 are provided at the same time, the diameter of the first filtering pipe 201 is larger than that of the pipe opening 202a of the second filtering pipe 202, and is larger than that of the communication hole, so that the aluminum solution must flow through the filtering holes of the first filtering pipe 201, then through the filtering holes of the second filtering pipe 202, and finally flow into the second cavity from the communication hole. Through setting up first filter tube 201 and second filter tube 202, can realize filtering the two poles of the earth of aluminium solution, strengthened the filter effect.

In the embodiment of the present invention, referring to fig. 5-8, the filtering apparatus 20 further includes a second deslagging assembly 40, and the second deslagging assembly 40 includes a second filtering unit 410. The second filtering unit 410 includes a second connecting rod 411 and a second filtering unit, which are fixedly connected together, the second connecting rod 411 slidably penetrates through the sealing plate 203, and the second connecting rod 411 can slide along the first cavity toward the second cavity or the second cavity toward the first cavity relative to the sealing plate 203. The second connecting rod 411 comprises a first end located in the first cavity and a second end located in the second cavity, the first end is fixedly connected with a second filter ring 412, the second filter ring 412 is arranged between the first filter pipe 201 and the second filter pipe 202, and the inner surface of the second filter ring 412 and the outer surface of the second filter pipe 202 can be in a matching relationship or a smaller gap is left; the outer surface of the second filter ring 412 and the inner surface of the first filter pipe 201 may be in a fitting relationship or may be provided with a small gap. A second end of the second connecting rod 411 abuts against a lower surface of the circular truncated cone 331, and the second connecting rod 411 may be connected with the circular truncated cone 331 and move synchronously with the circular truncated cone 331, or may be provided with a return structure such as a spring, so that the second connecting rod 411 always moves towards the second cavity or has a tendency of the movement.

In the process of filtering by the tubular filter, when the filtering holes on the second filtering pipe 202 are blocked by impurities and the filtering holes on the first filtering pipe 201 are not blocked, the pressure in the first cavity rises and is higher than the pressure in the second cavity, and the upper end of the sliding plate 320 is driven by the pressure difference to move the whole sliding plate 320 along the first cavity towards the second cavity. While the slide plate 320 moves, the protrusion 321 abuts against the lower surface of the circular truncated cone 331 (the surface facing the sealing plate 203 side) and drives the circular truncated cone 331 to ascend synchronously, and the second connecting rod 411 ascends synchronously. When the circular truncated cone 331 rises for a preset distance and contacts the trigger mechanism 311, the circular truncated cone 331 continues to rise for a short distance, and the circular truncated cone 331 is pushed by the trigger mechanism 311 to move from the first position to the second position, the circular truncated cone 331 is separated from the contact with the protrusion 321, rapidly moves towards the first cavity under the elastic force of the first spring 340, and synchronously drives the first filter ring 333 to slide along the surface of the first filter pipe 201, and drives the second filter ring 412 to slide along the surface of the second filter pipe 202. During the sliding process of the second filtering ring 412, the impurities blocked at the filtering holes are removed, so that the filtering holes are conducted again. The circular table 331 returns to the first position from the second position due to its own elasticity in the process of moving to the first cavity; after the filter holes are not blocked, the pressures in the first cavity and the second cavity are balanced, the sliding plate 320 returns to the initial position again under the action of self gravity, and the whole filter device 20 returns to the initial state until the filter holes are blocked next time, so that the actions are repeated, and the second filter pipe 202 is automatically cleaned.

In the embodiment of the present invention, referring to fig. 9-12, the second deslagging assembly 40 further includes a turning plate 421, a rotating shaft and two inclined sliding blocks 430 arranged in pairs, the turning plate 421 is arranged at the pipe orifice 202a of the second filtering pipe 202, the rotating shaft is arranged along the radial direction of the second filtering pipe 202 and is located at the pipe orifice 202a, and the turning plate 421 can move along two directions: one is to slide along the axial direction of the second filtering pipe 202, and the other is to rotate around and in synchronization with the rotation axis, and has a sealing position for closing the nozzle 202a and an opening position for opening the nozzle 202a before and after the rotation. The sliding and rotating of the flipping board 421 have a linkage relationship, that is, there is a correlation between the rotating angle of the flipping board 421 and the sliding of the flipping board 421, and the correlation can be ensured by a mechanical structure, for example, the part of the rotating shaft protruding from the flipping board 421 is rotatably disposed in the mounting groove 203c of the sealing board 203, and the rack is disposed in the mounting groove 203c, and correspondingly, the part of the rotating shaft located in the mounting groove 203c is provided with gear teeth, when the flipping board 421 and the rotating shaft rotate synchronously, due to the gear teeth meshing, the flipping board 421 will be driven to ascend or descend synchronously relative to the sealing board 203. It should be noted that, when the flipping plate 421 slides along the axial direction of the second filtering pipe 202, its upper limit position should not exceed the pipe orifice 202a and be located inside the second cavity; the flipping panel 421 has two extreme positions, an open position and a closed position, when rotated about the rotation axis.

The second connecting plate is provided with a slot body for accommodating the inclined slide block 430, the slot body comprises a transverse slot 411a and a longitudinal slot 411b which are communicated with each other, and the transverse slot 411a and the longitudinal slot 411b are approximately in a T shape. The sealing plate 203 is provided with a slider groove 203a near the second connecting plate, and the slider groove 203a is communicated with the groove body. The diagonal slider 430 includes a main body portion 431 and a sliding portion 432, the sliding portion 432 is located in the slot, the main body portion 431 is located in the slider slot 203a, and a fourth spring is further provided in the slider slot 203a, and an elastic force of the fourth spring always pushes the two diagonal sliders 430 to approach each other and enables the sliding portion 432 to be located in the longitudinal slot 411 b. The opposite side surfaces of the main body parts 431 of the two inclined sliders 430 are abutting inclined surfaces 431a, one end of the rotating shaft extends into the slider groove 203a and abuts against the abutting inclined surfaces 431a of the two inclined sliders 430 at the same time, and the force of the one end of the rotating shaft abutting against the abutting inclined surfaces 431a of the inclined sliders 430 can be decomposed into two forces: one is a force to move the slanted slider 430 upward along the longitudinal slot 411b, and the other is a force to move the slanted slider 430 toward both ends of the lateral slot 411a against the fourth spring.

In the process of filtering by the tubular filter, when the aluminum solution is filtered by the filter tube and flows from the first cavity to the second cavity, the turning plate 421 is turned to the open position under the action of the flowing force of the aluminum solution and rises synchronously along with the turning. When the flipping plate 421 ascends, the rotation shaft synchronously ascends to push the abutment slope 431a of the slanted slider 430. If the second connecting plate is in the initial state, the sliding portion 432 of the inclined slider 430 can move towards the two ends of the transverse slot 411a of the slot body, and when the sliding portion 432 is located in the transverse slot 411a, the inclined slider 430 cannot move up and down, so that the second connecting plate cannot move up and down under the limitation of the sliding portion 432. In this state, the filter device 20 performs a normal filtering operation.

When the filtering holes on the filtering pipe are blocked, the aluminum solution does not flow to the second cavity any more, the turnover plate 421 is not influenced by the flowing force of the aluminum solution any more, and returns to the closed position from the open position. At the same time, the rotating shaft no longer pushes the inclined slider 430 to abut against the inclined surface 431a, and the inclined slider 430 returns to the longitudinal slot 411b again under the action of the fourth spring. As can be seen from the foregoing description, when the second connecting plate moves upward due to the pressure difference between the first cavity and the second cavity, when the second connecting plate moves upward by a small amount, the transverse slot 411a is lifted, and the sliding portion 432 of the inclined slider 430 is completely located in the longitudinal slot 411b and cannot move transversely. At this time, if the flipping panel 421 has a tendency of flipping and raising, the rotation shaft needs to be raised synchronously, and the rotation shaft needs to be raised to push the oblique slider 430 until the sliding portion 432 of the oblique slider 430 is located in the lateral slot 411a, and the sliding portion 432 cannot be located in the lateral slot 411a, so that the rotation shaft cannot be raised, the flipping panel 421 cannot be flipped, and the flipping panel 421 is always in the sealing position. Moreover, before the second connecting plate is lowered to the initial position, the sliding portion 432 of the inclined slider 430 is always located in the longitudinal slot 411b and cannot move laterally, that is, the flipping plate 421 cannot be opened until the second connecting plate is lowered to the initial position. Therefore, when the second filter ring 412 is pressed downward, the aluminum solution between the first filter ring 333 and the second filter ring 412 is pressed, and the flipping plate 421 cannot be opened, so that the aluminum solution can only burst the impurities blocking the filter holes of the first filter pipe 201 and flow out of the filter holes of the first filter pipe 201. In short, the purpose of arranging the turning plate 421, the groove body and the inclined slide block 430 is to ensure that the turning plate 421 is always in the closed position during the descending process of the second filter ring 412.

In the embodiment of the present invention, the second slag removing assembly 40 further includes a fixing ring 422 and a round rod 423, the round rod 423 is fixedly disposed at the axis of the second filtering pipe 202, the fixing ring 422 is slidably sleeved on the round rod 423 and disposed near the pipe opening 202a, the number of the turning plates 421 is plural, and the plural turning plates 421 are disposed between the round rod 423 and the fixing ring 422. By providing a plurality of the flipping plates 421, the structure at the nozzle 202a can be simplified.

In the embodiment of the present invention, the round rod 423 is provided with the second spring 424, and the second spring 424 always moves or has a tendency to move the fixing ring 422 and the flipping board 421 to the first cavity direction. The round rod 423 may further be provided with a mounting stand 425 to facilitate mounting of the second spring 424. Thereby enabling the flipping board 421 to be quickly returned from the open position to the closed position without the aluminum solution flowing force. It should be noted that in the filter device 20 without the second spring 424, the turning plate 421 can also move downward under the gravity and return from the open position to the closed position.

In the embodiment of the present invention, the sealing plate 203 is provided with a baffle plate 203b, and the baffle plate 203b is disposed at the pipe orifice 202a and located in the second cavity. For example, the baffle 203b may be disposed on the sealing plate 203 near the nozzle 202a at the discharge port 102. Since the number of the communication holes is plural, it is known that the flow rate of the aluminum solution at the pipe orifice 202a closer to the discharge port 102 is larger, and the bernoulli effect is also larger. In order to reduce the bernoulli effect and make the filtering effect of the filtering pipes close to the outlet 102 and far from the outlet 102 as uniform as possible, the flow baffle plate 203b is arranged at the pipe orifice 202a to offset the bernoulli effect generated by the flow of the aluminum solution to a certain extent.

In the present embodiment, the flipping panel 421 rotates clockwise or counterclockwise. It should be noted that the same flipping panel 421 can only be rotated in the same direction.

In the embodiment of the present invention, the triggering mechanism 311 includes a first triggering inclined surface 311a, the circular truncated cone 331 is provided with a second triggering inclined surface 331b, and when the circular truncated cone 331 contacts the triggering mechanism 311, the first triggering inclined surface 311a pushes the second triggering inclined surface 331b and moves the circular truncated cone 331 from the first position to the second position. It is understood that the trigger mechanism 311 may take other forms.

In the present embodiment, a third spring 312 is provided in the pressure storage tube 310, and the third spring 312 always moves or has a tendency to move the sliding plate 320 toward the first cavity.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The production method of the aluminum foil for the low-pinhole power battery is characterized by sequentially comprising the following steps of:

wherein a tubular filtration step is included between the melting and the cast rolling, the tubular filtration step being performed within a tubular filter comprising:

the first deslagging assembly comprises a pressure storage pipe, a sliding plate, a first filtering unit and a first spring, the interior of the pressure storage pipe is communicated with the first cavity, the sliding plate is arranged in the pressure storage pipe in a sliding mode, one end of the sliding plate extends out of the pressure storage pipe to form a protruding part, and the protruding part is located in the second cavity; the first filtering unit comprises a circular table, a first connecting rod and a first filtering ring which are fixedly connected into a whole, the first connecting rod is slidably arranged in the sealing plate in a penetrating mode, the circular table is elastically connected to the sealing plate through a first spring and is located in the second cavity, and the first spring always enables the circular table to move towards the sealing plate or has a tendency of moving towards the sealing plate; the first filter ring is sleeved outside the first filter pipe; the circular table has a first position and a second position, the circular table is always in the first position or has a tendency to move to the first position; the pressure storage pipe is provided with a trigger mechanism, the trigger mechanism enables the circular truncated cone to move from the first position to the second position, the protruding portion abuts against the circular truncated cone and can drive the circular truncated cone to move in the direction departing from the sealing plate when the circular truncated cone is located at the first position, and the circular truncated cone is not in contact with the protruding portion when the circular truncated cone is located at the second position;

the trigger mechanism comprises a first trigger inclined plane, a second trigger inclined plane is arranged on the circular truncated cone, and when the circular truncated cone contacts the trigger mechanism, the first trigger inclined plane pushes the second trigger inclined plane and enables the circular truncated cone to move from the first position to the second position.

2. The method for producing the aluminum foil for the low-pinhole power battery as claimed in claim 1, further comprising a second filtering pipe embedded in the first filtering pipe, wherein the second filtering pipe is provided with a pipe orifice and filtering holes, and the pipe orifice abuts against the sealing plate.

3. The production method of the aluminum foil for the low-pinhole power battery as claimed in claim 2, further comprising a second deslagging assembly, wherein the second deslagging assembly comprises a second filtering unit, the second filtering unit comprises a second connecting rod and a second filtering ring which are fixedly connected into a whole, the second connecting rod is slidably arranged in the sealing plate in a penetrating manner, one end of the second connecting rod abuts against the circular truncated cone, and the second filtering ring is arranged between the first filtering pipe and the second filtering pipe.

4. The production method of the aluminum foil for the low-pinhole power battery as claimed in claim 3, wherein the second deslagging assembly further comprises a turnover plate, a rotating shaft and two inclined slide blocks, the rotating shaft is arranged at the pipe orifice along the diameter direction of the second filtering pipe, the turnover plate is arranged at the pipe orifice and can slide along the axial direction of the second filtering pipe, the turnover plate rotates around the rotating shaft in the sliding process, and the pipe orifice is closed or opened before and after the turnover plate rotates; the second connecting rod is provided with a transverse groove and a longitudinal groove which are communicated with each other, the sealing plate is provided with a slider groove, a fourth spring is arranged in the slider groove, the inclined slider comprises a main body part and a sliding part, the sliding part is positioned in the transverse groove or the longitudinal groove, the main body part is positioned in the slider groove, one side surface of the main body part, opposite to the two inclined sliders, is an inclined surface, and one end of the rotating shaft extends into the slider groove and abuts against the inclined surfaces of the two inclined sliders; the elastic force of the fourth spring always causes the two oblique sliders to approach each other and the sliding portion to be located in the longitudinal groove.

5. The method for producing the aluminum foil for the low-pinhole power battery as claimed in claim 4, wherein the second deslagging assembly further comprises a fixing ring and a round bar, the round bar is fixedly arranged at the axis of the second filtering tube, the fixing ring is slidably sleeved on the round bar and is arranged close to the tube orifice, the number of the turnover plates is multiple, and the turnover plates are arranged between the round bar and the fixing ring.

6. The method for producing the aluminum foil for the low-pinhole power battery as claimed in claim 5, wherein the round bar is provided with a second spring, and the second spring always enables the fixing ring and the turnover plate to move towards the direction of the first cavity or has a tendency to move along the direction.

7. The method for producing the aluminum foil for the low-pinhole power battery as claimed in claim 5, wherein a flow baffle is arranged on the sealing plate, and the flow baffle is arranged at the pipe orifice and positioned in the second cavity.

8. The production method of the aluminum foil for the low-pinhole power battery as claimed in any one of claims 4 to 7, wherein the turnover plate is rotated clockwise or counterclockwise.

9. The method for producing an aluminum foil for a low-pinhole power battery as claimed in any one of claims 1 to 7, wherein a third spring is arranged in the pressure storage tube, and the third spring always moves the sliding plate towards the first cavity or has the tendency of moving the sliding plate towards the first cavity.