Device for improving ion concentration of wet film pole piece

Abstract

The utility model belongs to the technical field of battery manufacturing, and discloses a device for improving the ion concentration of a wet film pole piece, which comprises an electrolysis component and a power supply component. The electrolysis assembly is used for enabling metal ions in slurry of the pole piece to directionally move and forming a metal simple substance and / or a metal oxide on the outer side of the slurry of the pole piece, and the electrolysis assembly comprises a first electrode electrically connected with the slurry of the pole piece and a second electrode electrically connected with an empty foil area of the pole piece; the cathode of the power supply assembly is connected with the first electrode, and the anode is connected with the second electrode. According to the device for improving the ion concentration of the wet film pole piece, metal ions in the coated pole piece can be separated out in the form of a metal simple substance and / or a metal oxide, so that the ion concentration in the coated pole piece is effectively reduced, and the safety and the service life of a battery are ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery manufacturing technology, and in particular to a device for improving the ion concentration of wet film electrodes. Background Technology

[0002] The coating process refers to applying a slurry to the current collector through slit coating, scraping, or roller coating. The slurry is formed by mixing active materials, binders, conductive agents, and solvents through mechanical stirring. However, some metal ions are inevitably introduced or generated in the raw materials of the slurry and during the slurry stirring process. In the subsequent electrode baking process, these metal ions are prone to forming metal oxides at high temperatures and mixing into the electrode. After the battery is assembled, during subsequent charging and discharging, the metal oxides will precipitate, forming sharp foreign objects that can puncture the separator, thereby affecting the safety and lifespan of the battery.

[0003] Therefore, there is an urgent need for a device to improve the ion concentration of wet film electrodes in order to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a device for improving the ion concentration of wet film electrodes, which can precipitate metal ions in the electrodes in the form of elemental metals and / or metal oxides, thereby effectively reducing the ion concentration in the electrodes and ensuring the safety and service life of the battery.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Devices for improving ion concentration on wet film electrodes include:

[0007] An electrolysis assembly is used to direct the movement of metal ions in the slurry of an electrode and to form elemental metals and / or metal oxides on the outside of the slurry of the electrode. The electrolysis assembly includes a first electrode electrically connected to the slurry of the electrode and a second electrode electrically connected to the empty foil area of ​​the electrode.

[0008] A power supply component, wherein the negative terminal of the power supply component is connected to the first electrode, and the positive terminal of the power supply component is connected to the second electrode.

[0009] Optionally, the electrolysis assembly further includes a flexible electrical connector disposed on the side of the first electrode facing the electrode sheet, the flexible electrical connector being able to abut against the electrode sheet to electrically connect the first electrode and the second electrode.

[0010] Optionally, it also includes a suction component for suctioning away the gas generated after the solvent electrolysis in the slurry. The electrolysis component also includes a mounting base, the first electrode is disposed on the mounting base, the mounting base is provided with an airflow channel, the air inlet of the airflow channel is directly facing the electrode, and the suction component is in communication with the airflow channel.

[0011] Optionally, an air intake groove is provided on the mounting base, the air intake groove is located on the side of the first electrode, the opening of the air intake groove faces the electrode plate, and the air intake groove is connected to the airflow channel.

[0012] Optionally, the air intake groove is arranged around the periphery of the first electrode.

[0013] Optionally, the airflow channel includes a main channel and multiple branch channels that are connected to each other. The multiple branch channels are radially distributed, and each branch channel is connected to the air intake groove.

[0014] Optionally, the air intake assembly includes a negative pressure pump and an air intake pipe, wherein the air intake pipe is connected between the negative pressure pump and the air outlet of the airflow channel.

[0015] Optionally, the power supply component includes a power supply, an electrical connection line, and conductive rollers. The negative terminal of the power supply is electrically connected to the first electrode through the electrical connection line, and the positive terminal of the power supply is connected to the conductive rollers through the electrical connection line. Two conductive rollers are provided, and the two conductive rollers are symmetrically connected to the empty foil areas on both sides of the electrode sheet.

[0016] Optionally, the metal ions within the electrode can also form the elemental metal and / or the metal oxide on the surface of the electrode;

[0017] The device for improving the ion concentration of the wet film electrode further includes a support and a detection component. The detection component is disposed on the support and located downstream of the electrolysis component. The detection component is capable of detecting and identifying the elemental metal and / or the metal oxide on the surface of the electrode.

[0018] Optionally, the device for improving the ion concentration of the wet film electrode further includes an identification component, which is disposed on the support and communicatively connected to the detection component. The identification component is capable of identifying the elemental metal and / or the metal oxide on the surface of the electrode.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a device for improving the ion concentration of wet film electrode sheets. A first electrode is electrically connected between the negative electrode of the power supply component and the slurry of the electrode sheet, and a second electrode is electrically connected between the positive electrode of the power supply component and the empty foil area of ​​the electrode sheet. In use, the power supply component provides electrical energy, forming an electrical circuit between the first electrode, negative electrode, slurry, empty foil area, positive electrode, and second electrode, thereby creating an electric field between the first electrode and the slurry. Under the action of the electric field, metal ions in the slurry move towards the first electrode and gain electrons at the first electrode, thus forming elemental metals and / or metal oxides. When the metal ions gain electrons, the solvent in the slurry loses electrons and electrolyzes to produce gas, connecting the second electrode to the empty foil area of ​​the electrode sheet. This effectively reduces excessive solvent loss in the slurry before the electrode sheet undergoes the drying process. This device for improving the ion concentration of wet film electrode sheets can electrolyze metal ions in the electrode sheet to precipitate in the form of elemental metals and / or metal oxides, thereby effectively reducing the ion concentration in the electrode sheet and ensuring battery safety and lifespan. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0022] Figure 1 This is a partial structural schematic diagram of the device for improving the ion concentration of a wet film electrode provided in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the electrolysis assembly provided in this embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the airflow channel and air intake groove structure of the electrolysis component provided in this embodiment of the utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the device for improving the ion concentration of the wet film electrode provided in this embodiment of the present invention during use.

[0026] In the picture:

[0027] 100. Electrode; 101. Empty foil area; 102. Paste;

[0028] 1. Electrolysis assembly; 11. First electrode; 12. Mounting base; 121. Airflow channel; 1211. Main channel; 1212. Branch channel; 122. Suction groove; 13. Flexible electrical connector;

[0029] 2. Suction assembly; 21. Negative pressure pump; 22. Suction pipe;

[0030] 3. Power supply components; 31. Power supply; 32. Electrical connection wires; 33. Conductive rollers;

[0031] 4. Detection components;

[0032] 5. Identification components;

[0033] 6. Bracket. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this utility model, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this utility model, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0042] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0043] The production process of secondary battery electrodes mainly includes steps such as raw material preparation, mixing and preparation, coating and drying, cutting and shaping, baking and curing, and packaging and inspection. The "mixing and preparation" step involves mixing raw materials to form positive and negative electrode slurries, which are then coated onto the current collector; these are collectively referred to as slurries. The main steps of the "coating and drying" step are as follows: after coating the slurry onto the current collector, the wet film electrode is placed in an oven for drying, evaporating the solvent in the slurry, and allowing the slurry on the wet film electrode to completely solidify, finally forming a dry film electrode.

[0044] One embodiment of this application provides a device for improving the ion concentration of a wet film electrode, such as... Figure 1 and Figure 4As shown, the electrode 100 includes a current collector and a slurry 102 coated on the current collector (black part in the figure). The part of the current collector not coated with slurry 102 is the empty foil area 101 of the electrode 100 (white part in the figure). Specifically, the slurry 102 is formed by mixing active material, binder, conductive agent and solvent by mechanical stirring. This is prior art and will not be described in detail.

[0045] like Figure 1 and Figure 2 As shown, the device for improving the ion concentration of a wet film electrode includes an electrolysis assembly 1 and a power supply assembly 3. The electrolysis assembly 1 is used to direct the movement of metal ions within the slurry 102 of the electrode 100 and to form elemental metals and / or metal oxides on the outer side of the slurry 102 of the electrode 100. The power supply assembly 3 is capable of providing electrical energy to the electrolysis assembly 1.

[0046] Specifically, the electrolysis assembly 1 includes a first electrode 11 electrically connected to the slurry 102 of the electrode 100, and a second electrode electrically connected to the empty foil region 101 of the electrode 100. The negative electrode of the power supply assembly 3 is connected to the first electrode 11, and the positive electrode of the power supply assembly 3 is connected to the second electrode. When the power supply assembly 3 supplies power, an electrical circuit is formed between the first electrode 11, the negative electrode, the slurry 102, the empty foil region 101, the positive electrode, and the second electrode, thereby creating an electric field between the first electrode 11 and the slurry 102. Under the action of the electric field, metal ions in the slurry 102 move towards the first electrode 11 and gain electrons on the first electrode 11, thereby forming elemental metals and / or metal oxides, effectively reducing the ion concentration in the electrode 100 and ensuring the safety and lifespan of the battery.

[0047] It is understandable that, as metal ions gain electrons, the solvent in the slurry 102 loses electrons and electrolyzes to produce gas, thus causing solvent loss. In this embodiment, the second electrode is connected to the empty foil area 101 of the electrode 100. This arrangement can effectively reduce excessive solvent loss in the slurry 102 before the electrode 100 undergoes the drying process.

[0048] Optionally, such as Figure 1 and Figure 2As shown, the electrolysis assembly 1 also includes a flexible electrical connector 13. The flexible electrical connector 13 is disposed on the side of the first electrode 11 facing the electrode plate 100. The flexible electrical connector 13 can abut against the electrode plate 100 to electrically connect the first electrode 11 and the electrode plate 100. The flexible electrical connector 13 is used to achieve circuit conduction between the first electrode 11 and the electrode plate 100, so that metal ions in the slurry 102 of the electrode plate 100 can move towards the first electrode 11 under the action of an electric field. Simultaneously, the flexible electrical connector 13 also prevents direct contact between the first electrode 11 and the electrode plate 100, preventing collisions and scratches to the electrode plate 100. In this embodiment, the flexible electrical connector 13 can be selected as a soft contact brush with conductive function, such as a carbon fiber conductive brush or a conductive fiber brush. By controlling the brush density and the current of the power supply assembly 3, the electric field strength between the first electrode 11 and the electrode plate 100 can be adjusted, thereby controlling the movement speed of metal ions and the precipitation rate of elemental metals and / or metal oxides.

[0049] Optionally, the system also includes a suction component 2, which is used to remove the gas generated by the solvent in the slurry 102 after electrolysis. The electrolysis component 1 also includes a mounting base 12, on which the first electrode 11 is detachably mounted. An airflow channel 121 is provided inside the mounting base 12, with the air inlet of the airflow channel 121 facing the electrode 100. The airflow channel 121 is connected to the suction component 2 to facilitate the recovery of the gas generated during electrolysis.

[0050] During electrolysis, water molecules lose electrons at the positive electrode, generating oxygen gas and hydrogen ions (H+). + The reaction is: 4H₂O(l) → O₂(g) + 4H₂O + (aq)+4e - In the formula, l represents liquid, g represents gas, and aq represents solution. To improve the gas absorption efficiency after electrolysis, such as... Figures 1-3 As shown, in this embodiment, the mounting base 12 has an air intake groove 122. The air intake groove 122 is located on the side of the first electrode 11, with the opening of the groove facing the electrode 100. The air intake groove 122 is connected to the airflow channel 121. The opening of the air intake groove 122 is the air inlet of the airflow channel 121. When gas is generated by electrolysis, it can be quickly absorbed by the air intake groove 122 on the side of the first electrode 11.

[0051] Preferably, the gas absorption groove 122 is arranged around the periphery of the first electrode 11 to effectively improve the gas absorption rate and absorption efficiency.

[0052] Specifically, refer to Figure 2 and Figure 3The airflow channel 121 includes a main channel 1211 and multiple branch channels 1212 connected to each other. The multiple branch channels 1212 are radially distributed, and each branch channel 1212 is connected to the suction groove 122. In this embodiment, the first electrode 11 is a rectangular sheet, and the mounting base 12 is a cuboid block, with the bottom surface of the mounting base 12 serving as the mounting surface. The first electrode 11 is detachably mounted on the mounting surface. The suction groove 122 surrounds the periphery of the first electrode 11, forming a rectangular ring structure. At least one vent hole is provided at the bottom of the suction groove 122 corresponding to each side of the rectangular ring. Each vent hole is connected to a branch channel 1212. The ends of the multiple branch channels 1212 opposite to the suction groove 122 are connected to the main channel 1211, thereby absorbing the gas generated by electrolysis.

[0053] Of course, in other embodiments, multiple air intake holes can be provided on the mounting base 12, with multiple air intake holes spaced apart on the side of the first electrode 11. Each air intake hole is connected to the airflow channel 121, which can also effectively improve the gas absorption speed and absorption efficiency.

[0054] Optionally, such as Figure 1 As shown, the suction assembly 2 includes a negative pressure pump 21 and a suction pipe 22, which connects the negative pressure pump 21 to the outlet of the airflow channel 121. The negative pressure pump 21 can output negative pressure to the suction pipe 22, thereby absorbing the gas generated by electrolysis through the suction pipe 22.

[0055] Continue to refer to Figure 1 The power supply component 3 includes a power supply 31, an electrical connection line 32, and conductive rollers 33. The negative terminal of the power supply 31 is electrically connected to the first electrode 11 via the electrical connection line 32, and the positive terminal of the power supply 31 is connected to the conductive rollers 33 via the electrical connection line 32. Two conductive rollers 33 are provided, and the two conductive rollers 33 are symmetrically connected to the empty foil areas 101 on both sides of the electrode 100. The conductive rollers 33 and the first electrode 11 can slide relatively synchronously along the length direction of the electrode 100, thereby causing metal ions in the electrode 100 to precipitate from the slurry 102 and reducing the metal ion concentration in the electrode 100.

[0056] Understandably, when metal ions move under the influence of an electric field and form solid deposits such as elemental metals and / or metal oxides, a large portion of these solid deposits adhere to the surface of the first electrode 11, while a small portion adheres to the surface of the electrode 100. The solid deposits on the first electrode 11 can be resolved by cleaning or replacing the first electrode 11. However, the solid deposits on the electrode 100 require inspection, labeling, and treatment to prevent them from flowing into subsequent processes and affecting battery quality.

[0057] Specifically, such as Figure 4As shown, the device for improving the ion concentration of the wet film electrode also includes a support 6 and a detection component 4. The detection component 4 is disposed on the support 6 and located downstream of the electrolysis component 1. The detection component 4 is capable of detecting and identifying elemental metals and / or metal oxides on the surface of the electrode 100. In this embodiment, the detection component 4 can be selected as a vision camera in the prior art, which can identify the deposited metals and / or metal oxides.

[0058] More specifically, the device for improving the ion concentration of the wet film electrode also includes an marking component 5. The marking component 5 is mounted on the support 6 and is communicatively connected to the detection component 4. The marking component 5 can mark the elemental metals and / or metal oxides on the surface of the electrode 100. In this embodiment, the marking component 5 is an inkjet mechanism, which can mark the metals and / or metal oxides identified by the visual camera, facilitating subsequent identification and processing by operators.

[0059] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A device for improving the ion concentration of a wet film electrode, characterized in that, include: An electrolysis assembly (1) is used to direct the movement of metal ions in the slurry (102) of the electrode (100) and form elemental metals and / or metal oxides on the outside of the slurry (102) of the electrode (100). The electrolysis assembly (1) includes a first electrode (11) electrically connected to the slurry (102) of the electrode (100) and a second electrode electrically connected to the empty foil region (101) of the electrode (100). The power supply component (3) has its negative terminal connected to the first electrode (11) and its positive terminal connected to the second electrode.

2. The device for improving the ion concentration of a wet film electrode according to claim 1, characterized in that, The electrolysis assembly (1) further includes a flexible electrical connector (13), which is disposed on the side of the first electrode (11) facing the electrode (100). The flexible electrical connector (13) can abut against the electrode (100) to electrically connect the first electrode (11) and the second electrode.

3. The device for improving the ion concentration of a wet film electrode according to claim 1, characterized in that, It also includes a suction component (2) for suctioning away the gas generated after the solvent electrolysis in the slurry (102). The electrolysis component (1) also includes a mounting base (12). The first electrode (11) is disposed on the mounting base (12). An airflow channel (121) is provided in the mounting base (12). The air inlet of the airflow channel (121) is directly facing the electrode (100). The suction component (2) is connected to the airflow channel (121).

4. The device for improving the ion concentration of a wet film electrode according to claim 3, characterized in that, An air intake groove (122) is provided on the mounting base (12). The air intake groove (122) is located on the side of the first electrode (11). The opening of the air intake groove (122) is directly opposite the electrode (100). The air intake groove (122) is connected to the airflow channel (121).

5. The apparatus for improving the ion concentration of a wet film electrode according to claim 4, characterized in that, The air intake groove (122) is arranged around the periphery of the first electrode (11).

6. The apparatus for improving the ion concentration of a wet film electrode according to claim 4, characterized in that, The airflow channel (121) includes a main channel (1211) and multiple branch channels (1212) that are connected to each other. The multiple branch channels (1212) are radially distributed, and each branch channel (1212) is connected to the air intake groove (122).

7. The device for improving the ion concentration of a wet film electrode according to claim 3, characterized in that, The air intake assembly (2) includes a negative pressure pump (21) and an air intake pipe (22), wherein the air intake pipe (22) is connected between the negative pressure pump (21) and the air outlet of the airflow channel (121).

8. The apparatus for improving the ion concentration of a wet film electrode according to claim 1, characterized in that, The power supply component (3) includes a power supply (31), an electrical connection line (32), and a conductive roller (33). The negative terminal of the power supply (31) is electrically connected to the first electrode (11) through the electrical connection line (32), and the positive terminal of the power supply (31) is connected to the conductive roller (33) through the electrical connection line (32). There are two conductive rollers (33), and the two conductive rollers (33) are symmetrically connected to the empty foil area (101) on both sides of the electrode (100).

9. The apparatus for improving the ion concentration of a wet film electrode according to any one of claims 1-8, characterized in that, The metal ions within the electrode (100) can also form the elemental metal and / or the metal oxide on the surface of the electrode (100); The device for improving the ion concentration of the wet film electrode also includes a support (6) and a detection component (4), the detection component (4) being disposed on the support (6) and located downstream of the electrolysis component (1), the detection component (4) being capable of detecting and identifying the elemental metal and / or the metal oxide on the surface of the electrode (100).

10. The apparatus for improving the ion concentration of a wet film electrode according to claim 9, characterized in that, The device for improving the ion concentration of the wet film electrode also includes an identification component (5), which is disposed on the support (6) and is communicatively connected to the detection component (4). The identification component (5) is capable of identifying the elemental metal and / or the metal oxide on the surface of the electrode (100).

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