Slurry electrolysis device and battery production equipment

Abstract

The invention discloses a slurry electrolysis device and battery production equipment, and relates to the technical field of lithium batteries. As an electrolysis positive electrode and an electrolysis negative electrode are positioned between a slurry inlet and a slurry outlet and are in contact with battery slurry, the electrolysis positive electrode and the electrolysis negative electrode are in contact with the battery slurry; under the condition that the potential applied by a power supply for connecting the electrolysis positive electrode and the electrolysis negative electrode is greater than the oxidation potential of a to-be-electrolyzed metal element or alloy in the battery slurry, the to-be-electrolyzed metal element or alloy in the battery slurry can serve as a micro positive electrode, the surface of the to-be-electrolyzed metal element or alloy is oxidized due to potential difference and is gradually dissolved into ions, and the ions are gradually dissolved along with electrolysis. And large metal elementary substance particles are continuously oxidized, the volume is gradually reduced, and finally, the metal elementary substance particles are completely dissolved into metal ions without discharge risk, so that the removal of the metal elementary substance or alloy to be electrolyzed in the battery slurry is realized, and the self-discharge risk of the battery is reduced.

Description

Technical Field

[0001] This application relates to the technical field of lithium batteries, and particularly to a slurry electrolysis device and battery production equipment. Background Art

[0002] During the production and transportation of battery slurry, metal impurities are inevitably introduced into the battery slurry. Some metal elements and alloys among these metal impurities may cause the problem of self-discharge due to precipitation on the anode of the battery formed during preparation, affecting the battery quality. Therefore, there is an urgent need for a device that can remove the metal elements and alloys in the battery slurry that are prone to cause self-discharge, thereby reducing the risk of battery self-discharge. Summary of the Invention

[0003] The main purpose of this application is to provide a slurry electrolysis device and battery production equipment, aiming to remove the metal elements and alloys in the battery slurry that are prone to cause self-discharge and reduce the risk of battery self-discharge.

[0004] To achieve the above object, this application provides a slurry electrolysis device, including a slurry inlet and a slurry outlet. The battery slurry flows in from the slurry inlet and flows out from the slurry outlet; an electrolysis positive electrode and an electrolysis negative electrode, located between the slurry inlet and the slurry outlet and in contact with the battery slurry; and a power source connected between the electrolysis positive electrode and the electrolysis negative electrode, and the potential applied by the power source is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry.

[0005] In an embodiment of this application, a slurry electrolysis device is provided. Since the electrolysis positive electrode and the electrolysis negative electrode are located between the slurry inlet and the slurry outlet and in contact with the battery slurry, thus, when the potential applied by the power source connected between the electrolysis positive electrode and the electrolysis negative electrode is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry, the metal element or alloy to be electrolyzed in the battery slurry will act as a microscopic anode, and its surface is oxidized due to the potential difference and gradually dissolved into ions. As the electrolysis progresses, larger metal element particles are continuously oxidized, and the volume gradually shrinks, and finally completely dissolved into metal ions without the risk of discharge, realizing the removal of the metal element or alloy to be electrolyzed in the battery slurry and reducing the risk of battery self-discharge.

[0006] In one embodiment, the potential applied by the power source is less than the oxidation potential of the electrolysis positive electrode. That is to say, the potential applied by the power source is greater than the oxidation potential of the metal element or alloy to be electrolyzed and less than the oxidation potential of the electrolysis positive electrode. Thus, during the electrolysis process, the electrolysis positive electrode is prevented from being oxidized.

[0007] In one embodiment, the device further includes: a pipe body, the slurry inlet is the inlet of the pipe body, and the slurry outlet is the outlet of the pipe body; the pipe body has electrical conductivity and serves as the electrolytic negative electrode; the electrolytic positive electrode is arranged axially in the pipe body along the pipe body. A feasible implementation manner is provided in this embodiment.

[0008] In one embodiment, there are multiple electrolytic positive electrodes, and the multiple electrolytic positive electrodes are dispersedly arranged in the transverse direction of the pipe body. In this way, the multiple electrolytic positive electrodes can fully electrolyze the battery slurry in the pipe body, further reducing the risk of battery self-discharge.

[0009] In one embodiment, the device further includes: a pipe body, the inlet of the pipe body serves as the slurry inlet, the outlet of the pipe body serves as the slurry outlet, and the pipe body is made of insulating material; the electrolytic positive electrode and the electrolytic negative electrode are arranged axially in the pipe body along the pipe body, and the electrolytic positive electrode and the electrolytic negative electrode do not contact. Another feasible implementation manner is provided in this embodiment.

[0010] In one embodiment, there are multiple electrolytic positive electrodes and multiple electrolytic negative electrodes; the multiple electrolytic positive electrodes and the multiple electrolytic negative electrodes are alternately distributed in the transverse direction of the pipe body in the pipe body to form a parallel or staggered electrode array. In this way, the multiple electrolytic positive electrodes and the multiple electrolytic negative electrodes can fully electrolyze the battery slurry in the pipe body, further reducing the risk of battery self-discharge.

[0011] In one embodiment, a filter screen is provided at the outlet of the pipe body. Thus, the complex formed by the metal ions after the metal element or alloy to be electrolyzed is electrolyzed and combined with OH - plasma, or other impurities such as large-particle metal impurity oxides are filtered out, improving the purity of the battery slurry.

[0012] In one embodiment, the surfaces of the electrolytic positive electrode and the electrolytic negative electrode are provided with a microporous structure, a corrugated structure or a reticulated structure. Thus, the contact area between the battery slurry and the electrolytic positive electrode and the electrolytic negative electrode can be increased, and the battery slurry can form a slurry turbulence at the microporous structure, the corrugated structure or the reticulated structure, enhancing the transverse fluidity of the battery slurry.

[0013] In one embodiment, the electrolytic positive electrode has a spiral or wavy structure. Thus, the residence time of the battery slurry in the pipe body can be extended.

[0014] In one embodiment, the diameter of the pipeline body is between 300 mm and 800 mm, and the flow rate of the battery slurry in the pipeline body is between 0.05 m / s and 1 m / s. Within this range, it is possible to balance the coating speed of the battery slurry and the residence time of the battery slurry in the pipeline, thereby fully electrolyzing the metal impurities in the battery slurry.

[0015] In one embodiment, the potential applied by the power supply is between 4 V and 100 V. At this potential, metal impurities in the battery slurry, such as copper, iron, stainless steel, zinc, etc., can be oxidized and decomposed.

[0016] In one embodiment, the base material of the electrolysis positive electrode is titanium, and the surface of the base material has a coating of iridium tantalum titanium, ruthenium iridium titanium, or platinum-plated titanium. This kind of electrolysis positive electrode has high electrochemical stability, is not easily oxidized and decomposed under the action of an electric field, and has good corrosion resistance, which can significantly reduce the risk of the electrolysis positive electrode being corroded by the battery slurry.

[0017] In addition, to achieve the above object, the present application also proposes a battery production device, including a slurry storage device, a transfer pipeline connecting the slurry storage device, a slurry electrolysis device as described in any one of the above embodiments connecting the transfer pipeline, and a coater communicating with the slurry electrolysis device. Description of the Drawings

[0018] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram provided for Embodiment 1 of the slurry electrolysis device of the present application; Figure 2 It is a schematic structural diagram provided for Embodiment 2 of the slurry electrolysis device of the present application; Figure 3 For Figure 2 It is a schematic cross-sectional diagram of the shown slurry electrolysis device; Figure 4 It is a schematic structural diagram provided for Embodiment 3 of the slurry electrolysis device of the present application; Figure 5 For Figure 4 It is a schematic structural diagram of the first / second support member of the shown slurry electrolysis device; Figure 6Schematic diagram provided for the fourth embodiment of the slurry electrolysis device of the present application; Figure 7 is Figure 6 Schematic diagram of the first / second suspension member of the slurry electrolysis device shown; Figure 8 Schematic diagram provided for the fifth embodiment of the slurry electrolysis device of the present application; Figure 9 Schematic diagram provided for the sixth embodiment of the slurry electrolysis device of the present application; Figure 10 is Figure 9 Cross-sectional schematic diagram of the slurry electrolysis device shown; Figure 11 Schematic diagram provided for the seventh embodiment of the slurry electrolysis device of the present application; Figure 12 is Figure 11 Schematic diagram of the first / second support member of the slurry electrolysis device shown; Figure 13 Schematic diagram provided for the eighth embodiment of the slurry electrolysis device of the present application; Figure 14 is Figure 13 Schematic diagram of the first / second suspension member of the slurry electrolysis device shown; Figure 15 Schematic diagram of the battery production equipment of the embodiment of the present application.

[0021] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0022] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0025] Reference to "embodiment" in this document means that the specific features, structures, or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0027] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0030] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0031] To better understand the technical solutions of the present application, the following will be described in detail in conjunction with the drawings of the specification and specific implementation manners.

[0032] During the production and transportation of battery slurry, metal impurities are inevitably introduced into the battery slurry. These metal impurities include metallic elements (such as copper, zinc, iron, nickel, etc.), alloys (such as stainless steel), and metal oxides, etc. These metallic elements and alloys (such as copper, zinc, iron, nickel, stainless steel, etc.) may precipitate on the anode of the battery formed during preparation, causing self-discharge problems and affecting the battery quality. Therefore, there is an urgent need for a device that can remove the metallic elements and alloys in the battery slurry that are prone to self-discharge problems, thereby reducing the risk of battery self-discharge.

[0033] In view of this, the present application proposes a slurry electrolysis device, which includes a slurry inlet and a slurry outlet. The battery slurry flows in from the slurry inlet and flows out from the slurry outlet; an electrolysis positive electrode and an electrolysis negative electrode, which are located between the slurry inlet and the slurry outlet and are in contact with the battery slurry; and a power supply connected between the electrolysis positive electrode and the electrolysis negative electrode, and the potential applied by the power supply is greater than the oxidation potential of the metallic element or alloy to be electrolyzed in the battery slurry.

[0034] In the embodiment of the present application, a slurry electrolysis device is provided. Since the electrolysis positive electrode and the electrolysis negative electrode are located between the slurry inlet and the slurry outlet and are in contact with the battery slurry, thus, when the potential applied by the power supply connected between the electrolysis positive electrode and the electrolysis negative electrode is greater than the oxidation potential of the metallic element or alloy to be electrolyzed in the battery slurry, the metallic element or alloy to be electrolyzed in the battery slurry will act as a microscopic anode, and its surface is oxidized due to the potential difference and gradually dissolved into ions. As the electrolysis progresses, the larger metallic element particles are continuously oxidized, and the volume gradually shrinks, and finally completely dissolved into metal ions without self-discharge risk, realizing the removal of the metallic element or alloy to be electrolyzed in the battery slurry and reducing the risk of battery self-discharge.

[0035] It should be noted that there are OH - plasma in the battery slurry. After the metallic element or alloy to be electrolyzed is electrolyzed into metal ions, it can combine with OH - plasma to form a complex, or be further oxidized into a metal oxide, and the complex and the metal oxide do not have self-discharge risk.

[0036] It is feasible that a filter screen is provided at the slurry outlet, so as to filter out the complex formed by the combination of the metallic element or alloy to be electrolyzed into metal ions and OH - plasma, or other impurities such as large particle metal impurity oxides, and improve the purity of the battery slurry.

[0037] It is feasible that the potential applied by the power supply is less than the oxidation potential of the electrolysis positive electrode. That is to say, the potential applied by the power supply is greater than the oxidation potential of the metallic element or alloy to be electrolyzed and less than the oxidation potential of the electrolysis positive electrode. Thus, during the electrolysis process, the electrolysis positive electrode is prevented from being oxidized.

[0038] It is feasible that the material of the electrolytic positive electrode and the electrolytic negative electrode is one of titanium, stainless steel, iridium tantalum titanium, ruthenium iridium titanium, titanium plated with platinum, graphite, and conductive ceramics, so as to prevent the electrolytic positive electrode and the electrolytic negative electrode from being corroded by the battery slurry, and at the same time, prevent the electrolytic positive electrode from being oxidized and decomposed before the metal element or alloy to be electrolyzed.

[0039] The potential applied by the power supply can be 4V~100V. At this potential, the metal element or alloy to be electrolyzed in the battery slurry, such as copper, zinc, iron, nickel, stainless steel, etc., can be oxidized and decomposed.

[0040] It is achievable when the power supply applies a potential of 4V to 100V, and the substrate of the electrolytic positive electrode is titanium, and the substrate surface is coated with iridium-tantalum-titanium, ruthenium-iridium-titanium, or titanium-plated-platinum. This electrolytic positive electrode has high electrochemical stability and is not easily oxidized and decomposed in an electric field with a potential of 4V to 100V. It also has excellent corrosion resistance, which can significantly reduce the risk of the electrolytic positive electrode being corroded by battery slurry.

[0041] It is feasible. Since the electrolytic anode undergoes a reduction reaction, the electrochemical stability requirements for the electrolytic anode are not high. The electrolytic anode can be made of low-cost stainless steel or titanium, which have certain corrosion resistance. To further improve the corrosion resistance of the electrolytic anode, an anti-corrosion coating can be applied to its surface. Of course, if cost is not a factor, the electrolytic cathode and electrolytic anode can be made of the same material.

[0042] It is feasible that the surfaces of the electrolytic positive electrode and the electrolytic negative electrode are provided with a microporous structure, a corrugated structure or a mesh structure, which can increase the contact area between the battery slurry and the electrolytic positive electrode and the electrolytic negative electrode, and the battery slurry can form slurry turbulence at the microporous structure, corrugated structure or mesh structure, thereby enhancing the lateral fluidity of the battery slurry.

[0043] It is feasible that the electrolytic positive electrode has a spiral or wavy structure, thereby increasing the contact area between the battery slurry and the electrolytic positive electrode and improving the electrolysis efficiency.

[0044] In one possible implementation, Figure 1 As shown, the slurry electrolysis device includes: a pipe body 40, a slurry inlet 101 as the inlet of the pipe body 40, and a slurry outlet 102 as the outlet of the pipe body 40; the pipe body 40 is conductive and serves as the electrolysis negative electrode 20; the electrolysis positive electrode 10 is arranged in the pipe body 40 along the axial direction of the pipe body 40.

[0045] Attachment Figure 1The cross-sectional shape of the pipe body 40 is shown as circular for illustrative purposes only. In actual applications, the cross-sectional shape of the pipe body 40 may also be rectangular, polygonal, or irregular, without limitation. In this application, the axial direction of the pipe body 40 is the longitudinal direction of the pipe body 40 , and the transverse direction of the pipe body 40 is the direction in which the cross-sectional shape of the pipe body 40 extends.

[0046] The pipe body 40 is made of a conductive material and has electrical conductivity, and serves as the electrolytic negative electrode 20. The electrolytic positive electrode 10 is disposed in the pipe body 40 along the axial direction thereof and does not contact the pipe body 40.

[0047] The power supply 30 is disposed outside the pipe body 40 , and the electrolysis positive electrode 10 and the electrolysis negative electrode 20 (pipe body 40 ) are connected to the power supply 30 via a connecting line. In this way, the power supply 30 applies a potential between the electrolysis positive electrode 10 and the electrolysis negative electrode 20 (pipe body 40 ), and the applied potential is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry.

[0048] During actual use, the battery slurry is fed into the inlet of the pipeline body 40, and the battery slurry flows in the pipeline body 40. The power supply 30 is turned on, and the power supply 30 applies a potential between the electrolysis positive electrode 10 and the electrolysis negative electrode 20 (pipe body 40). The applied potential is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry. In this way, during the flow of the battery slurry in the pipeline body 40, the metal element or alloy to be electrolyzed in the battery slurry will act as a microscopic anode, and its surface will be oxidized due to the potential difference and gradually dissolved into ions. As the electrolysis proceeds, larger metal element particles are continuously oxidized, and their volume gradually shrinks, and finally completely dissolved into metal ions with no discharge risk, thereby realizing the removal of the metal element or alloy to be electrolyzed during the battery slurry transmission process, thereby simultaneously realizing the functions of transmitting and electrolyzing the battery slurry, and reducing the risk of battery self-discharge.

[0049] Achievable, see Figure 1 There can be only one electrolytic positive electrode 10, which is arranged in the middle position of the electrolytic negative electrode 20 (the pipe body 40).

[0050] Achievable, such as Figure 2 and Figure 3 As shown, there can be multiple electrolytic positive electrodes 10, and the multiple electrolytic positive electrodes 10 are dispersed along the transverse direction of the electrolytic negative electrode 20 (pipe body 40). In this way, the multiple electrolytic positive electrodes 10 can fully electrolyze the battery slurry in the pipe body 40, further reducing the risk of battery self-discharge.

[0051] It should be noted that the plurality of electrolytic positive electrodes 10 can be directly connected to the power supply 30, or, as Figure 2 As shown, multiple electrolytic positive electrodes 10 are connected together through a wire 103, and the power supply 30 is connected to one of the multiple electrolytic positive electrodes 10.

[0052] To fully electrolyze the battery paste, the distance between two adjacent electrolysis anodes 10 should be as close as possible. However, considering that the battery paste needs to flow through the gaps between multiple electrolysis anodes 10, the distance between two adjacent electrolysis anodes 10 can be 3 to 5 millimeters.

[0053] It is achievable that the cross-section of the electrolysis anode 10 is circular, with a diameter between 5 millimeters and 50 millimeters, and the total number of electrolysis anodes 10 is between 2 and 30, which can be set according to the situation.

[0054] To evenly disperse and arrange multiple electrolysis anodes 10 in the transverse direction of the electrolysis cathode 20 (pipe body 40), it is necessary to fix the multiple electrolysis anodes 10.

[0055] In a feasible implementation, as Figure 4 shown, the device further includes: a first support member 51 and a second support member 52. The first support member 51 is arranged at the entrance of the pipe body 40 in the transverse direction of the pipe body 40, and the second support member 52 is arranged at the exit of the pipe body 40 in the transverse direction of the pipe body 40. The first support member 51 and the second support member 52 are used to support the multiple electrolysis anodes 10.

[0056] In this embodiment, the first support member 51 and the second support member 52 are built into the entrance and exit of the pipe body 40. The first support member 51 and the second support member 52 jointly fix the multiple electrolysis anodes 10 in the electrolysis cathode 20 (pipe body 40) by means of support.

[0057] It is achievable that, referring to Figure 5 , the first support member 51 includes a first support plate 511, and multiple first openings 512 are provided on the first support plate 511. The second support member 52 includes a second support plate 521, and multiple second openings 522 are provided on the second support plate 521. The multiple first openings 512 and the multiple second openings 522 respectively correspond to the multiple electrolysis anodes 10 one by one, and one end of the electrolysis anode 10 passes through the first opening 512, and the other end of the electrolysis anode 10 passes through the second opening 522.

[0058] Both the first support plate 511 and the second support plate 521 are circular plates and are transversely clamped in the electrolysis cathode 20 (pipe body 40) along the transverse direction of the electrolysis cathode 20 (pipe body 40). The difference is that the first support plate 511 is arranged at the entrance of the electrolysis cathode 20 (pipe body 40), and the second support plate 521 is arranged at the exit of the electrolysis cathode 20 (pipe body 40).

[0059] A plurality of first openings 512 are formed in the first support plate 511, and a plurality of second openings 522 are provided on the second support plate 521. The plurality of first openings 512 and the plurality of second openings 522 respectively correspond to the plurality of electrolytic positive electrodes 10 one by one, that is, the number of the first openings 512, the number of the second openings 522 and the number of the electrolytic positive electrodes 10 are the same. In this way, one end of the electrolytic positive electrode 10 is located in the first opening 512, and the other end is located in the second opening 522, so that it is fixed in the electrolytic negative electrode 20 (pipe body 40) by the first support member 51 and the second support member 52.

[0060] In order to reduce the obstruction of the first support plate 511 and the second support plate 521 to the flow of the battery slurry in the electrolytic negative electrode 20 (pipe body 40), in this embodiment, a plurality of third openings 513 are provided on the first support plate 511, and a plurality of fourth openings 523 are provided on the second support plate 521. The plurality of third openings 513 and the plurality of fourth openings 523 are used for the battery slurry to flow through, thereby reducing the obstruction of the first support member 51 and the second support member 52 to the flow of the battery slurry.

[0061] In order to extend the retention time of the battery slurry in the pipe body 40 and improve the removal rate of the metal simple substance or alloy to be electrolyzed in the battery slurry, the length of the pipe body 40 should not be too short, and the flow rate of the battery slurry should not be too fast. In this embodiment, the length of the pipe body 40 reaches the meter level, and the flow rate of the battery slurry reaches the cm / s level. Specifically, the length of the pipe body 40 can be between 1 m and 10 m, such as 4 m, 5 m, 7 m, etc., and the flow rate of the battery slurry can be between 1 cm / s and 10 cm / s, such as 2 cm / s, 4 cm / s, 5 cm / s, 7 cm / s, etc. In practical applications, the flow rate of the battery slurry can be appropriately matched according to the pipe length, so as to ensure the retention time of the battery slurry in the pipe body 40. For example, if the length of the pipe body 40 is 5 m, the flow rate of the battery slurry can be 5 cm / s; if the length of the pipe body 40 is 10 m, the flow rate of the battery slurry can be 10 cm / s.

[0062] Since the length of the pipe body 40 reaches the meter level, due to its own gravity, the middle position of the plurality of electrolytic positive electrodes 10 is prone to sag and contact short-circuit with the electrolytic negative electrode 20 (pipe body 40). Therefore, in this embodiment, a third support member (not shown in the figure) can also be provided. The third support member can be one or more. The third support member is built in the middle position of the electrolytic negative electrode 20 (pipe body 40). The third support member is provided with a fifth opening for the electrolytic positive electrode 10 to pass through, and a sixth opening for the battery slurry to flow through. In this way, the third support member supports the middle position of the plurality of electrolytic positive electrodes 10, avoiding the middle position of the electrolytic positive electrode 10 from sagging and contacting short-circuit with the electrolytic negative electrode 20 (pipe body 40).

[0063] In one embodiment, the diameter of the pipeline main body is between 300 mm and 800 mm, and the flow rate of the battery slurry in the pipeline main body is between 0.05 m / s and 1 m / s. Within this range, the coating speed of the battery slurry and the residence time of the battery slurry in the pipeline can be balanced, and thus the metal impurities in the battery slurry can be fully electrolyzed.

[0064] In another feasible implementation, as Figure 6 shown, the device further includes: a first suspension member 61 and a second suspension member 62. The first suspension member 61 is arranged at the inlet of the pipeline main body 40, and the second suspension member 62 is arranged at the outlet of the pipeline main body 40. One end of the first suspension member 61 is connected to a plurality of electrolysis positive electrodes 10, and the other end passes through the side wall at the inlet of the pipeline main body 40 and is clamped on the outer wall of the pipeline main body 40. One end of the second suspension member 62 is connected to a plurality of electrolysis positive electrodes 10, and the other end passes through the side wall at the outlet of the pipeline main body 40 and is clamped on the outer wall of the pipeline main body 40.

[0065] In this embodiment, the first suspension member 61 and the second suspension member 62 are arranged at the inlet and outlet of the pipeline main body 40. The first suspension member 61 and the second suspension member 62 jointly suspend a plurality of electrolysis positive electrodes 10 in the electrolysis negative electrode 20 (pipeline main body 40) by means of suspension.

[0066] In one implementation, referring to Figure 7 , the first suspension member 61 includes: a plurality of first connection lines 611, a first insulating fixing member 612; the second suspension member 62 includes: a plurality of second connection lines 621, a second insulating fixing member 622; the first ends of a plurality of electrolysis positive electrodes 10 are fixedly connected through a plurality of first connection lines 611, and the second ends of a plurality of electrolysis positive electrodes 10 are fixedly connected through a plurality of second connection lines 621; the first insulating fixing member 612 passes through the side wall at the inlet of the pipeline main body 40, and one end is clamped on the outer wall of the pipeline main body 40, and the other end is connected to the first end of an electrolysis positive electrode 10; the second insulating fixing member 622 passes through the side wall at the outlet of the pipeline main body 40, and one end is clamped on the outer wall of the pipeline main body 40, and the other end is connected to the second end of an electrolysis positive electrode 10.

[0067] The first suspension member 61 includes a plurality of first connection lines 611 and a first insulating fixing member 612. The first ends of a plurality of electrolysis positive electrodes 10 are fixedly connected through a plurality of first connection lines 611 to form a mesh structure. The first insulating fixing member 612 passes through the side wall at the inlet of the pipeline main body 40, and one end is clamped on the outer wall of the pipeline main body 40, and the other end is connected to the first end of an electrolysis positive electrode 10. In this way, the first ends of a plurality of electrolysis positive electrodes 10 can be suspended in the electrolysis negative electrode 20 (pipeline main body 40).

[0068] The second suspension member 62 includes a plurality of second connecting wires 621 and second insulating fixing members 622. The second ends of the plurality of electrolytic positive electrodes 10 are fixedly connected through the plurality of second connecting wires 621 to form a mesh structure. The second insulating fixing members 622 pass through the side wall at the outlet of the pipe body 40, and one end is clamped on the outer wall of the pipe body 40, and the other end is connected to the second end of one electrolytic positive electrode 10. In this way, the second ends of the plurality of electrolytic positive electrodes 10 can be suspended in the electrolytic negative electrode 20 (pipe body 40).

[0069] In another implementation, the first suspension member 61 includes a plurality of first connecting members (not shown in the drawings). One ends of the plurality of first connecting members are fixed to the inner wall of the electrolytic negative electrode 20 (pipe body 40), or pass through the side wall at the inlet of the pipe body 40 and are clamped on the outer wall; the other ends of the plurality of first connecting members are fixedly connected to the first ends of the plurality of electrolytic positive electrodes 10 one by one. In this way, the first ends of the plurality of electrolytic positive electrodes 10 can be suspended in the electrolytic negative electrode 20 (pipe body 40).

[0070] The second suspension member 62 includes a plurality of second connecting members (not shown in the drawings). One ends of the plurality of second connecting members are fixed to the inner wall of the electrolytic negative electrode 20 (pipe body 40), or pass through the side wall at the outlet of the pipe body 40 and are clamped on the outer wall; the other ends of the plurality of second connecting members are fixedly connected to the second ends of the plurality of electrolytic positive electrodes 10 one by one. In this way, the second ends of the plurality of electrolytic positive electrodes 10 can be suspended in the electrolytic negative electrode 20 (pipe body 40).

[0071] In another feasible implementation, as Figure 8 shown, the device further includes: a pipe body 40. The inlet of the pipe body 40 serves as a slurry inlet 101, and the outlet of the pipe body 40 serves as a slurry outlet 102. The pipe body 40 is made of an insulating material; the electrolytic positive electrode 10 and the electrolytic negative electrode 20 are arranged in the pipe body 40 along the axial direction of the pipe body 40, and the electrolytic positive electrode 10 and the electrolytic negative electrode 20 do not contact each other.

[0072] Figure 8 The cross-sectional shape of the pipe body 40 shown in

[0073] is circular for the convenience of illustration only. In actual applications, the cross-sectional shape of the pipe body 40 can also be rectangular, polygonal, irregular, etc., without limitation. In the present application, the axial direction of the pipe body 40 is the length direction of the pipe body 40, and the transverse direction of the pipe body 40 is the extending direction of the cross-section of the pipe body 40.

[0074] The power supply 30 is arranged outside the pipeline body 40, and the electrolytic positive electrode 10 and the electrolytic negative electrode 20 are connected to the power supply 30 through a connecting line. In this way, the power supply 30 applies a potential between the electrolytic positive electrode 10 and the electrolytic negative electrode 20, and the applied potential is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry.

[0075] During actual use, the battery slurry is fed into the inlet of the pipeline body 40, and the battery slurry flows in the pipeline body 40. The power supply 30 is turned on, and the power supply 30 applies a potential between the electrolysis positive electrode 10 and the electrolysis negative electrode 20, and the applied potential is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry. In this way, during the flow of the battery slurry in the pipeline body 40, the metal element or alloy to be electrolyzed in the battery slurry will act as a microscopic anode, and its surface will be oxidized due to the potential difference and gradually dissolved into ions. As the electrolysis proceeds, larger metal element particles are continuously oxidized, and the volume gradually shrinks, and finally completely dissolved into metal ions with no discharge risk, thereby realizing the removal of the metal element or alloy to be electrolyzed during the battery slurry transmission process, thereby simultaneously realizing the functions of transmitting and electrolyzing the battery slurry, and reducing the risk of battery self-discharge.

[0076] Achievable, see Figure 8 The electrolytic positive electrode 10 and the electrolytic negative electrode 20 can both be one, and are arranged in the middle position of the pipeline body 40.

[0077] Achievable, such as Figure 9 and Figure 10 As shown, there can be multiple electrolytic positive electrodes 10 and multiple electrolytic negative electrodes 20. Multiple electrolytic positive electrodes 10 and multiple electrolytic negative electrodes 20 are alternately distributed in the pipeline body 40 along the transverse direction of the pipeline body 40 to form a parallel or staggered electrode array. In this way, the multiple electrolytic positive electrodes 10 and the multiple electrolytic negative electrodes 20 can fully electrolyze the battery slurry in the pipeline body 40, further reducing the risk of battery self-discharge.

[0078] It should be noted that if Figure 9 As shown, multiple electrolytic positive electrodes 10 and multiple electrolytic negative electrodes 20 can be directly connected to the power supply 30, or multiple electrolytic positive electrodes 10 are connected together by wires, multiple electrolytic negative electrodes 20 are connected together by wires, and the power supply 30 is connected to one of the multiple electrolytic positive electrodes 10 and to one of the multiple electrolytic negative electrodes 20.

[0079] In order to fully electrolyze the battery slurry, the distance between two adjacent electrolytic positive electrodes 10 and the electrolytic negative electrodes 20 is as close as possible. However, too close a distance may cause a short circuit risk. Therefore, the spacing between adjacent electrolytic positive electrodes and electrolytic negative electrodes is 5 mm to 50 mm.

[0080] It is achievable that the cross-sections of the electrolytic positive electrode 10 and the electrolytic negative electrode 20 are circular, with a diameter between 5 mm and 50 mm, and the total number of the electrolytic positive electrodes 10 and the electrolytic negative electrodes 20 is between 2 and 30, which can be set as required.

[0081] In order to evenly disperse multiple electrolytic positive electrodes 10 and multiple electrolytic negative electrodes 20 in the transverse direction of the pipeline main body 40, it is necessary to fix the multiple electrolytic positive electrodes 10 and the multiple electrolytic negative electrodes 20.

[0082] In a feasible implementation manner, as Figure 11 shown, the device further includes: a first support member 51 and a second support member 52. The first support member 51 is arranged at the entrance of the pipeline main body 40 in the transverse direction of the pipeline main body 40, and the second support member 52 is arranged at the exit of the pipeline main body 40 in the transverse direction of the pipeline main body 40. The first support member 51 and the second support member 52 are used to support the multiple electrolytic positive electrodes 10 and the multiple electrolytic negative electrodes 20.

[0083] In this embodiment, the first support member 51 and the second support member 52 are built in at the entrance and exit of the pipeline main body 40, and the first support member 51 and the second support member 52 jointly fix the multiple electrolytic positive electrodes 10 and the multiple electrolytic negative electrodes 20 in the pipeline main body 40 by means of support.

[0084] It is achievable that, referring to Figure 12 , the first support member 51 includes a first support plate 511, and a plurality of first openings 512 are provided on the first support plate 511. The second support member 52 includes a second support plate 521, and a plurality of second openings 522 are provided on the second support plate 521. The plurality of first openings 512 and the plurality of second openings 522 respectively correspond to the multiple electrolytic positive electrodes 10 and the multiple electrolytic negative electrodes 20 one by one, and one end of the electrolytic positive electrode 10 and the electrolytic negative electrode 20 passes through the first opening 512, and the other end of the electrolytic positive electrode 10 and the electrolytic negative electrode 20 passes through the second opening 522.

[0085] Both the first support plate 511 and the second support plate 521 are circular sheets and are clamped in the pipeline main body 40 in the transverse direction of the pipeline main body 40. The difference is that the first support plate 511 is arranged at the entrance of the pipeline main body 40, and the second support plate 521 is arranged at the exit of the pipeline main body 40.

[0086] The first support plate 511 is provided with a plurality of first openings 512, and the second support plate 521 is provided with a plurality of second openings 522. The plurality of first openings 512 and the plurality of second openings 522 correspond one-to-one to the plurality of electrolytic positive electrodes 10 and the plurality of electrolytic negative electrodes 20, respectively. That is, the number of first openings 512 and the number of second openings 522 are the same as the total number of electrolytic positive electrodes 10 and the number of electrolytic negative electrodes. In this way, one end of the electrolytic positive electrode 10 and the electrolytic negative electrode 20 is located in the first opening 512, and the other end of the electrolytic positive electrode 10 and the electrolytic negative electrode 20 is located in the second opening 522, thereby being fixed in the pipeline body 40 by the first support member 51 and the second support member 52.

[0087] In order to reduce the obstruction of the first support plate 511 and the second support plate 521 to the flow of battery slurry in the pipeline body 40, in this embodiment, a plurality of third openings 513 are provided on the first support plate 511, and a plurality of fourth openings 523 are provided on the second support plate 521. The plurality of third openings 513 and the plurality of fourth openings 523 are used for circulating battery slurry, thereby reducing the obstruction of the first support plate 511 and the second support plate 521 to the flow of battery slurry.

[0088] In order to extend the retention time of the battery slurry in the pipe body 40 and improve the removal rate of the metal element or alloy to be electrolyzed in the battery slurry, the length of the pipe body 40 should not be too short, and the flow rate of the battery slurry should not be too fast. In this embodiment, the length of the pipe body 40 reaches the meter level, and the flow rate of the battery slurry reaches the cm / s level. Specifically, the length of the pipe body 40 can be between 1m and 10m, such as 4m, 5m, 7m, etc., and the flow rate of the battery slurry can be between 1cm / s and 10cm / s, such as 2cm / s, 4cm / s, 5cm / s, 7cm / s, etc. In actual applications, the appropriate battery slurry flow rate can be adapted according to the pipe length to ensure the retention time of the battery slurry in the pipe body 40. For example, if the length of the pipe body 40 is 5m, the flow rate of the battery slurry can be 5cm / s; if the length of the pipe body 40 is 10m, the flow rate of the battery slurry can be 10cm / s.

[0089] Since the length of the pipeline body 40 reaches the meter level, the middle position of multiple electrolytic positive electrodes 10 and multiple electrolytic negative electrodes 20 is prone to falling due to their own gravity, resulting in contact and short circuit with the electrolytic positive electrodes 10 and the electrolytic negative electrodes 20. Therefore, in this embodiment, a third support member (not shown in the drawings) can also be provided. The third support member can be one or more. The third support member is built into the middle position of the pipeline body 40. The third support member is provided with a fifth opening for the passage of the electrolytic positive electrode 10 and the electrolytic negative electrode 20, and a sixth opening for the circulation of battery slurry. In this way, the third support member supports the middle position of the multiple electrolytic positive electrodes 10 and the multiple electrolytic negative electrodes 20 to prevent the middle position of the electrolytic positive electrode 10 and the electrolytic negative electrode 20 from falling and contacting and short circuiting.

[0090] In one embodiment, the diameter of the pipeline body is between 300 mm and 800 mm, and the flow rate of the battery slurry in the pipeline body is between 0.05 m / s and 1 m / s. Within this range, it is possible to balance the coating speed of the battery slurry and the residence time of the battery slurry in the pipeline, thereby fully electrolyzing the metal impurities in the battery slurry.

[0091] In another feasible implementation, as Figure 13 shown, the device further includes: a first suspension member 61 and a second suspension member 62. The first suspension member 61 is disposed at the inlet of the pipeline body 40, and the second suspension member 62 is disposed at the outlet of the pipeline body 40. The first suspension member 61 and the second suspension member 62 are made of insulating materials; one end of the first suspension member 61 is connected to a plurality of electrolytic positive electrodes 10 and a plurality of electrolytic negative electrodes 20, and the other end passes through the side wall at the inlet of the pipeline body 40 and is clamped on the outer wall of the pipeline body 40; one end of the second suspension member 62 is connected to a plurality of electrolytic positive electrodes 10 and a plurality of electrolytic negative electrodes 20, and the other end passes through the side wall at the outlet of the pipeline body 40 and is clamped on the outer wall of the pipeline body 40.

[0092] In this embodiment, a first suspension member 61 and a second suspension member 62 are disposed at the inlet and outlet of the pipeline body 40. The first suspension member 61 and the second suspension member 62 jointly suspend a plurality of electrolytic positive electrodes 10 and a plurality of electrolytic negative electrodes 20 in the pipeline body 40 by means of suspension.

[0093] In one implementation, referring to Figure 14 , the first suspension member 61 includes: a plurality of first connection lines 611 and a first insulating fixing member 612; the second suspension member 62 includes: a plurality of second connection lines 621 and a second insulating fixing member 622; the first ends of a plurality of electrolytic positive electrodes 10 and a plurality of electrolytic negative electrodes 20 are fixedly connected by a plurality of first connection lines 611, and the second ends of a plurality of electrolytic positive electrodes 10 and a plurality of electrolytic negative electrodes 20 are fixedly connected by a plurality of second connection lines 621; the first insulating fixing member 612 passes through the side wall at the inlet of the pipeline body 40, and one end is clamped on the outer wall of the pipeline body 40, and the other end is connected to the first end of an electrolytic positive electrode 10 or an electrolytic negative electrode 20; the second insulating fixing member 622 passes through the side wall at the outlet of the pipeline body 40, and one end is clamped on the outer wall of the pipeline body 40, and the other end is connected to the second end of an electrolytic positive electrode 10 or an electrolytic negative electrode 20.

[0094] The first suspension member 61 includes a plurality of first connecting wires 611 and a first insulating fixing member 612. The first ends of a plurality of electrolytic anodes 10 and a plurality of electrolytic cathodes 20 are fixedly connected through the plurality of first connecting wires 611 to form a mesh structure. The first insulating fixing member 612 passes through the side wall at the entrance of the pipe body 40, and one end is clamped on the outer wall of the pipe body 40, and the other end is connected to the first end of an electrolytic anode 10 or an electrolytic cathode 20. In this way, the first ends of the plurality of electrolytic anodes 10 and the plurality of electrolytic cathodes 20 can be suspended inside the pipe body 40.

[0095] The second suspension member 62 includes a plurality of second connecting wires 621 and a second insulating fixing member 622. The second ends of a plurality of electrolytic anodes 10 and a plurality of electrolytic cathodes 20 are fixedly connected through the plurality of second connecting wires 621 to form a mesh structure. The second insulating fixing member 622 passes through the side wall at the exit of the pipe body 40, and one end is clamped on the outer wall of the pipe body 40, and the other end is connected to the second end of an electrolytic anode 10 or an electrolytic cathode 20. In this way, the second ends of the plurality of electrolytic anodes 10 and the plurality of electrolytic cathodes 20 can be suspended inside the pipe body 40.

[0096] In another implementation manner, the first suspension member 61 includes a plurality of first connecting members (not shown in the drawings). One ends of the plurality of first connecting members are fixed to the inner wall of the pipe body 40, or pass through the side wall at the entrance of the pipe body 40 and are clamped on the outer wall; the other ends of the plurality of first connecting members are fixedly connected to the first ends of the plurality of electrolytic anodes 10 and the plurality of electrolytic cathodes 20 one by one. In this way, the first ends of the plurality of electrolytic anodes 10 and the plurality of electrolytic cathodes 20 can be suspended inside the pipe body 40.

[0097] The second suspension member 62 includes a plurality of second connecting members (not shown in the drawings). One ends of the plurality of second connecting members are fixed to the inner wall of the pipe body 40, or pass through the side wall at the exit of the pipe body 40 and are clamped on the outer wall; the other ends of the plurality of second connecting members are fixedly connected to the second ends of the plurality of electrolytic anodes 10 and the plurality of electrolytic cathodes 20 one by one. In this way, the second ends of the plurality of electrolytic anodes 10 and the plurality of electrolytic cathodes 20 can be suspended inside the pipe body 40.

[0098] In one implementation manner, the device further includes a self-cleaning device (not shown in the drawings) disposed inside the pipe inlet and / or the pipe outlet. When the battery slurry does not flow inside the slurry electrolysis device, clean water can be input into the slurry electrolysis device, and the self-cleaning device can be started to clean the inside of the pipe body 40, so as to avoid corrosion of the pipe body 40 caused by the long residence time of the battery slurry on the inner wall of the pipe body 40, thereby extending the service life of the slurry electrolysis device. The self-cleaning device can be an ultrasonic generator or a pulse backwashing device.

[0099] The slurry electrolysis device of the above implementation manner will be described below with reference to specific embodiments.

[0100] In one embodiment, the slurry electrolysis device's pipe body 40 is cylindrical, 300 mm in diameter, and 5 m in length. The battery slurry flow rate is 0.05 m / s. Pipe body 40 serves as the electrolysis negative electrode 20. It is made of stainless steel, and its inner surface is plated with titanium to prevent corrosion. A cylindrical positive electrode is designed within pipe body 40. The positive electrode is made of titanium and plated with iridium-tantalum to prevent corrosion. The power supply 30 applies a 5 V potential. 0.5 ppm of copper metal is added to each of two stirred cans of battery slurry, with each can containing approximately 600 kg of slurry. The diameter of the metal metal is 50 ± 10 μm.

[0101] The first tank of slurry is transported to the slurry electrolysis device through the slurry transport system, and the power supply 30 switch is turned on for electrolysis; the second tank of slurry is transported to the slurry electrolysis device through the slurry transport system, and the power supply 30 switch is turned off for no electrolysis, for comparative verification.

[0102] After all battery slurries pass through the slurry electrolysis device, the battery slurries are taken simultaneously to test the copper metal impurity content. The experiment found that the copper metal impurity content of the electrolyzed battery slurry was reduced by ≥98.2% compared with the non-electrolyzed battery slurry. The K value (self-discharge) of the battery cells made of electrolyzed and non-electrolyzed battery slurries was tested respectively. The K value excellence rate of the battery cells electrolyzed with the battery slurry was 99.95%, and the K value excellence rate of the battery cells without electrolysis with the battery slurry was 93.52%, and the K value excellence rate was significantly improved.

[0103] In another embodiment, the pipe body 40 of the slurry electrolysis device has a diameter of 300 mm and a length of 5 m. The battery slurry flow rate is 0.05 m / s. The pipe body 40 serves as the electrolysis negative electrode 20. The pipe body 40 is made of stainless steel, and its inner surface is plated with titanium to prevent corrosion. A cylindrical positive electrode is designed inside the pipe body 40. The positive electrode is made of titanium and its surface is plated with iridium-tantalum metal to prevent corrosion. The electrolysis voltage is 5 V.

[0104] 0.5 ppm of iron metal element was added to each of the two stirred slurries, with each slurry weighing about 600 kg, wherein the size of the metal element was 50±10 μm.

[0105] The first tank of slurry is transported to the slurry electrolysis device through the slurry transport system, and the power supply 30 switch is turned on for electrolysis; the second tank of slurry is transported to the slurry electrolysis device through the slurry transport system, and the power supply 30 switch is turned off for no electrolysis, for comparative verification.

[0106] After all battery slurries pass through the slurry electrolysis device, the battery slurries are taken simultaneously to test the copper metal impurity content. Compared with the non-electrolyzed battery slurry, the copper metal impurity content of the electrolyzed battery slurry is reduced by ≥99.0%.

[0107] The battery slurries with and without electrolysis are respectively used to fabricate battery cores for testing the K value (self-discharge). The excellent rate of the K value of the battery cores with electrolyzed battery slurries is 99.93%, and the excellent rate of the K value of the battery cores with non-electrolyzed battery slurries is 94.88%. The improvement of the excellent rate of the K value is obvious.

[0108] In summary, by using the slurry electrolysis device in the embodiment of the present application for electrolysis, the electrolysis efficiency is increased by more than 30%, the slurry with a solid impurity content of up to 20% can be processed without clogging, and the energy consumption is reduced by 15% - 20% of metallic elemental impurities.

[0109] It should be understood that each part disclosed in the present application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0110] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0111] The embodiment of the present application further provides a battery production device, as Figure 15 shown, including a slurry storage device 100, a transfer pipeline 200 connected to the slurry storage device 100, a slurry electrolysis device 300 as described in any of the above embodiments connected to the transfer pipeline 200, and a coater 400 communicating with the slurry electrolysis device 300.

[0112] The slurry storage device 100 is used to store battery slurry, and the battery slurry flows through the transfer pipeline 200 and the slurry electrolysis device 300 and then flows into the coater 400.

[0113] The above is only a partial embodiment of the present application, and thus does not limit the patent scope of the present application. All equivalent structural transformations made under the technical concept of the present application by using the content of the specification and drawings of the present application, or directly / indirectly applied to other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A slurry electrolysis device, characterized in that, The device comprises: a slurry inlet and a slurry outlet, wherein the battery slurry flows into the slurry inlet and flows out of the slurry outlet; an electrolytic positive electrode and an electrolytic negative electrode, located between the slurry inlet and the slurry outlet, and in contact with the battery slurry; A power supply connected between the electrolysis positive electrode and the electrolysis negative electrode, wherein the potential applied by the power supply is greater than the oxidation potential of the metal element or alloy to be electrolyzed in the battery slurry; The device further comprises: a pipeline body, the slurry inlet being the inlet of the pipeline body, and the slurry outlet being the outlet of the pipeline body; The electrolysis positive electrode is arranged in the pipeline body along the axial direction of the pipeline body. When the battery slurry flows from the inlet of the pipeline body to the outlet of the pipeline body, the metal element or alloy to be electrolyzed in the battery slurry is electrolyzed.

2. The slurry electrolysis device according to claim 1, wherein The potential applied by the power supply is lower than the oxidation potential of the electrolytic positive electrode.

3. The slurry electrolysis device according to claim 1, characterized in that The pipeline body has conductivity and serves as the electrolysis negative electrode.

4. The slurry electrolysis device according to claim 3, wherein There are a plurality of electrolytic positive electrodes, and the plurality of electrolytic positive electrodes are dispersedly arranged along the transverse direction of the pipeline body, and the transverse direction is the extending direction of the cross section of the pipeline body.

5. The slurry electrolysis device according to claim 4, characterized in that, The device further comprises: a first support member and a second support member, wherein the first support member is arranged at the inlet of the pipeline body along the transverse direction of the pipeline body, and the second support member is arranged at the outlet of the pipeline body along the transverse direction of the pipeline body. The first support member and the second support member are used to support a plurality of the electrolytic positive electrodes.

6. The slurry electrolysis device according to claim 5, characterized in that, The first support member includes a first support plate, on which a plurality of first openings are provided. The second support member includes a second support plate, on which a plurality of second openings are provided. The plurality of first openings and the plurality of second openings correspond one-to-one to the plurality of electrolytic positive electrodes, respectively, and one end of the electrolytic positive electrode passes through the first opening, and the other end of the electrolytic positive electrode passes through the second opening.

7. The slurry electrolysis device according to claim 6, characterized in that, The first support plate is provided with a plurality of third openings, and the second support plate is provided with a plurality of fourth openings. The plurality of third openings and the plurality of fourth openings are used for circulating the battery slurry.

8. The slurry electrolysis device according to claim 4, characterized in that, The device further comprises: a first hanging member and a second hanging member, wherein the first hanging member is arranged at the inlet of the pipe body, and the second hanging member is arranged at the outlet of the pipe body; One end of the first hanging member is connected to the plurality of electrolytic positive electrodes, and the other end passes through the side wall of the inlet of the pipe body and is clamped on the outer wall of the pipe body; One end of the second hanging member is connected to the plurality of electrolytic positive electrodes, and the other end passes through the side wall of the outlet of the pipe body and is clamped on the outer wall of the pipe body.

9. The slurry electrolysis device according to claim 8, wherein, The first suspension member includes: a plurality of first connecting members and a first insulating fixing member; the second suspension member includes: a plurality of second connecting members and a second insulating fixing member; The first ends of the plurality of electrolytic positive electrodes are fixedly connected by the plurality of first connecting members, and the second ends of the plurality of electrolytic positive electrodes are fixedly connected by the plurality of second connecting members; The first insulating fixing member passes through the side wall at the inlet of the pipe body, and one end is clamped on the outer wall of the pipe body, and the other end is connected to the first end of one of the electrolytic anodes; The second insulating fixing member passes through the side wall at the outlet of the pipe body, and one end is clamped on the outer wall of the pipe body, and the other end is connected to the second end of one of the electrolytic anodes.

10. The slurry electrolysis device according to claim 1, characterized in that, The pipe body is made of insulating material; The electrolytic cathode is arranged in the pipe body along the axial direction of the pipe body, and the electrolytic anode and the electrolytic cathode do not contact each other.

11. The slurry electrolysis device according to claim 10, wherein, There are multiple electrolytic anodes and multiple electrolytic cathodes; The multiple electrolytic anodes and the multiple electrolytic cathodes are alternately distributed in the pipe body along the transverse direction of the pipe body to form a parallel or staggered electrode array.

12. The slurry electrolysis device according to claim 11, wherein The distance between adjacent electrolytic anodes and electrolytic cathodes is between 5 mm and 50 mm.

13. The slurry electrolysis device according to claim 11, wherein The device further includes: a first support member and a second support member. The first support member is arranged at the inlet of the pipe body along the transverse direction of the pipe body, and the second support member is arranged at the outlet of the pipe body along the transverse direction of the pipe body. The first support member and the second support member are used to support the multiple electrolytic anodes and the multiple electrolytic cathodes.

14. The slurry electrolysis device according to claim 13, wherein, The first support member includes a first support plate, and multiple first openings are provided on the first support plate. The second support member includes a second support plate, and multiple second openings are provided on the second support plate; The multiple first openings and the multiple second openings respectively correspond to the multiple electrolytic anodes and the multiple electrolytic cathodes one by one, and one end of the electrolytic anode and the electrolytic cathode passes through the first opening, and the other end of the electrolytic anode and the electrolytic cathode passes through the second opening.

15. The slurry electrolysis device according to claim 14, characterized in that, Multiple third openings are provided on the first support plate, and multiple fourth openings are provided on the second support plate. The multiple third openings and the multiple fourth openings are used for circulating the battery slurry.

16. The slurry electrolysis device according to claim 11, characterized in that, The device further includes: a first suspension member and a second suspension member. The first suspension member is arranged at the inlet of the pipe body, and the second suspension member is arranged at the outlet of the pipe body. The first suspension member and the second suspension member are made of insulating material; One end of the first suspension member is connected to the multiple electrolytic anodes and the multiple electrolytic cathodes, and the other end passes through the side wall at the inlet of the pipe body and is clamped on the outer wall of the pipe body; One end of the second suspension member is connected to the multiple electrolytic anodes and the multiple electrolytic cathodes, and the other end passes through the side wall at the outlet of the pipe body and is clamped on the outer wall of the pipe body.

17. The slurry electrolysis device according to claim 16, characterized in that, The first suspension member includes: multiple first connecting members, a first insulating fixing member; the second suspension member includes: multiple second connecting members, a second insulating fixing member; The first ends of the multiple electrolytic anodes and the multiple electrolytic cathodes are fixedly connected through the multiple first connecting members, and the second ends of the multiple electrolytic anodes and the multiple electrolytic cathodes are fixedly connected through the multiple second connecting members; The first insulating fixing member passes through the side wall at the inlet of the pipeline body, and one end is clamped on the outer wall of the pipeline body, and the other end is connected to the first end of one of the electrolytic positive electrode or the electrolytic negative electrode; The second insulating fixing member passes through the side wall at the outlet of the pipeline body, and one end is clamped on the outer wall of the pipeline body, and the other end is connected to the second end of one of the electrolytic positive electrode or the electrolytic negative electrode.

18. The slurry electrolysis device according to claim 1, characterized in that, The diameter of the pipeline body is between 300 mm and 800 mm, and the flow rate of the battery slurry in the pipeline body is between 0.05 m / s and 1 m / s.

19. The slurry electrolysis device according to claim 1, characterized in that, The potential applied by the power supply is between 4 V and 100 V.

20. The slurry electrolysis device according to claim 1, characterized in that, The base material of the electrolytic positive electrode is titanium, and the surface of the base material has a coating of iridium tantalum titanium, ruthenium iridium titanium or platinum-plated titanium.

21. A battery production device, characterized in that, It includes a slurry storage device, a transfer pipeline connecting the slurry storage device, a slurry electrolysis device as described in any one of claims 1 to 20 connecting the transfer pipeline, and a coater communicating with the slurry electrolysis device.

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