Flame treatment apparatus and method for prepararing battery electrode sheet

Abstract

The present application provides a flame treatment apparatus and a method for preparing a battery electrode sheet. The flame treatment apparatus comprises a burner and a flame stabilizing cover. The burner is provided with a premixing cavity and a flame outlet that are in communication with one another. The flame stabilizing cover is provided on the burner. The flame stabilizing cover is provided with a flame guiding channel, one end of the flame guiding channel is provided with a first opening, and the other end thereof is provided with a second opening. The first opening is in communication with the flame outlet for guiding a flame ejected from the flame outlet into the flame guiding channel and ejecting same by means of the second opening, so as to perform flame treatment on a surface of a battery electrode sheet preform. Specifically, by means of adding the flame stabilizing cover at the flame outlet of the burner, the flame is not easily affected by an external flow field, the morphological stability of the flame is improved, and the flame utilization efficiency is improved, thereby improving the flame treatment effect on the battery electrode sheet preform.

Description

A flame treatment device and a method for preparing battery electrodes.

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 2024115383043, filed on October 30, 2024, the entire contents of which are incorporated herein by reference. [Technical Field]

[0003] This application relates to the field of battery technology, specifically to a flame treatment device and a method for preparing battery electrodes. [Background Technology]

[0004] In recent years, judging from the development of the market, the application scope of lithium-ion batteries has continued to expand, widely covering energy storage power systems such as mobile terminals, hydropower, thermal power, wind power and solar power plants, as well as mobile phones, tablets, laptops, power tools, electric bicycles, electric motorcycles, electric cars, military equipment, aerospace and many other fields.

[0005] To improve the energy density, cycle performance, and overall performance of lithium-ion batteries, the surface of the rolled battery electrode preform can be flame-treated. The battery electrode preform includes a current collector and an active layer disposed on the surface of the current collector. Flame treatment removes excess binder forming a polymer film on the surface of the active layer, creating micropores that connect to the current collector and improving the battery electrode performance.

[0006] However, existing flame treatment devices have low flame utilization efficiency for flame treatment of battery electrode preforms. [Summary of the Invention]

[0007] In view of the above problems, this application provides a battery device and an electrical device that can solve the problem of low flame utilization efficiency of existing flame treatment devices for flame treatment of battery electrode preforms.

[0008] In a first aspect, this application provides a flame treatment apparatus, comprising:

[0009] The burner has an interconnected premixing chamber and a flame outlet;

[0010] A flame stabilizer is installed on the burner;

[0011] The flame stabilizer has a flame guiding channel, one end of which has a first opening and the other end has a second opening; the first opening is connected to the flame outlet.

[0012] Specifically, by installing a flame stabilizer at the burner's outlet, the flame is less affected by the external flow field, improving the flame's morphological stability and increasing flame utilization efficiency, thereby enhancing the flame treatment effect on battery electrode preforms.

[0013] In some embodiments, the flame guiding channel is a straight channel; the extending direction of the flame guiding channel is the same as the extending direction of the flame outlet, or the extending direction of the flame guiding channel is inclined relative to the extending direction of the flame outlet.

[0014] Specifically, by setting the flame guide channel as a straight channel, and ensuring that its extension direction is the same as that of the flame outlet, the flame ejected from the flame outlet can be directly ejected along the straight channel, reducing the resistance of the flame ejection within the flame guide channel and thus improving the flame treatment efficiency of the battery electrode preform. Furthermore, by setting the flame guide channel as a straight channel, and ensuring that its extension direction is inclined relative to the extension direction of the flame outlet—for example, inclined towards the moving direction of the battery electrode preform—the "tailing" problem of the flame caused by the movement of the battery electrode preform is further mitigated.

[0015] In some embodiments, the angle of inclination of the extension direction of the flame guide channel relative to the extension direction of the flame outlet is 5 to 30°.

[0016] Specifically, the above settings can reduce the waste of flame heat caused by excessive tilting, thereby reducing energy consumption, and also ensure that the flame has a sufficient tilt in the direction of movement of the battery electrode preform, which can further improve the optimal solution to the "tailing" problem of the flame caused by the movement of the battery electrode preform.

[0017] In some embodiments, the extension direction of the flame guide channel is curved relative to the extension direction of the flame outlet.

[0018] Specifically, by setting the extension direction of the flame guide channel to bend relative to the extension direction of the flame outlet, for example, bending towards the moving direction of the battery electrode preform, the problem of flame "tailing" caused by the movement of the battery electrode preform can be further mitigated.

[0019] In some embodiments, the flame guide channel is curved into an arc shape.

[0020] Specifically, when the flame guide channel is curved and extended, the arc-shaped flame guide channel can reduce the energy loss of the flame in the flame guide channel and improve the morphological stability of the flame.

[0021] In some embodiments, the curvature of the arc is 4–20 m. -1 .

[0022] Specifically, the curvature of the arc-shaped flame guide channel is 4–20 m. -1This not only reduces the waste of flame heat caused by excessive bending, thereby reducing energy consumption, but also allows the flame to have sufficient curvature in the direction of movement towards the battery electrode preform, which can further improve the "tailing" problem of the flame caused by the movement of the battery electrode preform.

[0023] In some embodiments, the flame guiding channel has a flat structure; the extending direction of the flame guiding channel is inclined or bent to one side relative to the extending direction of the flame outlet in the thickness direction of the flame guiding channel.

[0024] Specifically, the flame guiding channel is designed with a flat structure. This flat shape allows for uniform flame flow and control over the combustion zone. The ejected flame is also flat. By moving the battery electrode preform along the thickness direction of the flame guiding channel, the flame treatment effect on the electrode preform is improved. Furthermore, the extension direction of the flame guiding channel is tilted or bent to one side in the thickness direction, for example, towards the direction of movement of the battery electrode preform, thereby further mitigating the "tailing" problem of the flame caused by the movement of the battery electrode preform 1.

[0025] In some embodiments, the flame stabilizer is further provided with two baffles at the end away from the burner, and the two baffles are disposed at opposite ends of the second opening along the width direction of the second opening.

[0026] Specifically, the two baffles reduce the probability that the flame ejected from the second opening will spread outwards in the width direction of the second opening towards the area outside the flame guide channel, thereby reducing the spread of the flame into areas that do not require flame treatment.

[0027] In some embodiments, the baffle extends along the height direction of the second opening to opposite ends of the second opening and protrudes from the second opening.

[0028] Specifically, the baffle is further configured to extend to the opposite ends of the second opening along the height direction of the second opening and protrude beyond the second opening. The baffle restricts the flame from spreading to the outside of the width direction of the second opening to a larger extent. Thus, when the battery electrode preform moves, the baffle can further improve the spread of the flame ejected from the second opening to the area outside the flame guide channel in the width direction of the second opening, thereby further reducing the side effects caused by the flame spreading to the area that does not require flame treatment.

[0029] In some embodiments, the baffle protrudes 25 to 100 mm from one end of the second opening along the height direction of the second opening.

[0030] Specifically, the baffle is set to protrude 25-100mm along the height direction of the second opening at one end. This simplifies the flame stabilizer structure, controls costs, and ensures that the baffle protrudes sufficiently along the height direction of the second opening at one end, thereby more effectively reducing the probability of flame spreading to areas that do not require flame treatment.

[0031] In some embodiments, the protruding length of the baffle on one side of the height direction of the second opening is greater than the protruding length on the other side; the extension direction of the flame guide channel is inclined or bent towards the side of the baffle with a larger protruding length in the thickness direction of the flame guide channel relative to the extension direction of the flame outlet.

[0032] Specifically, by setting the flame guide channel to tilt or bend towards the side with a larger protruding length of the baffle, the side effects caused by the flame jetting from the second opening having a longer flame tail in the tilting or bending direction of the flame guide channel, which leads to the flame spreading into areas that do not require flame treatment, can be reduced.

[0033] In some embodiments, the flame outlet has a flat structure, the width of the first opening is 1-3 mm greater than the width of the flame outlet, the height of the first opening is 1-3 mm greater than the height of the flame outlet, the length of the flame guiding channel is 25-45 mm, and the length of the flame outlet is 10-30 mm.

[0034] Specifically, the flame outlet is designed with a flat structure. The flat shape of the flame outlet helps control the combustion zone and improves the flame treatment effect on the electrode plates. Furthermore, the width of the first opening is 1-3 mm greater than the width of the flame outlet, and the height of the first opening is 1-3 mm greater than the height of the flame outlet. This ensures that the flame ejected from the flame outlet can be completely received into the flame guiding channel by the first opening, reducing energy loss of the flame as it enters the flame guiding channel. In addition, the length of the flame guiding channel is set to 25-45 mm, and the length of the flame outlet is 10-30 mm. Within this length range, the consistency of the flame can be improved.

[0035] In some embodiments, the burner has a plurality of flame outlets spaced apart; the flame stabilizer includes a cover body and a plurality of partition plates disposed within the cover body, the plurality of partition plates dividing the space within the cover body into a plurality of flame guiding channels, the plurality of flame guiding channels corresponding one-to-one with the plurality of flame outlets, and the first opening of each flame guiding channel covering one of the flame outlets.

[0036] Specifically, through the above design, the flame treatment device can simultaneously process multiple battery electrode areas on the battery electrode preform, thereby improving processing efficiency.

[0037] In some embodiments, the partition plates of two adjacent flame guide channels are spaced apart.

[0038] Specifically, through the above settings, the interval between two adjacent partitions can correspond to areas that do not require flame treatment, thereby reducing the side effects caused by flame spreading to areas that do not require flame treatment.

[0039] Secondly, this application provides a method for preparing a battery electrode, comprising:

[0040] Prepare a battery electrode preform; the battery electrode preform includes a current collector and an active layer;

[0041] The surface of the battery electrode preform is subjected to flame treatment; wherein the flame treatment is performed using any one of the flame treatment devices described above.

[0042] Specifically, the flame treatment device described above is used to flame treat the electrode preform, making the flame ejected from the flame outlet less susceptible to the influence of the external flow field, improving the morphological stability, consistency, and controllability of the combustion zone of the flame, thereby increasing the flame utilization efficiency and thus improving the flame treatment effect on the battery electrode preform.

[0043] In some embodiments, the step of flame treating the surface of the battery electrode preform includes:

[0044] The second opening of the flame guiding channel is positioned at an interval toward the active layer; wherein the distance between the second opening of the flame guiding channel and the active layer is 5–25 mm.

[0045] Flames are ejected from the second opening of the flame guide channel.

[0046] Specifically, the distance between the second opening of the flame guiding channel and the active layer is set to 5-25mm. This not only improves the problem of flame "tailing" caused by the movement of the battery electrode preform, but also reduces the probability of scratching the active layer due to the small distance between the second opening of the flame guiding channel and the active layer.

[0047] In some embodiments, the width of the second opening is smaller than the width of the active layer; the step of positioning the second opening of the flame guiding channel toward the active layer at a distance includes:

[0048] The active layer is made to protrude from the second opening at both ends in the width direction.

[0049] In this way, the flame that spreads in the width direction can be used to flame-treat the protruding areas at both ends of the active layer in the width direction. This can reduce the probability of the flame spreading to areas that do not require flame treatment, and also improve the utilization rate of the flame, thereby increasing the efficiency of electrode production.

[0050] In some embodiments, the width of the protrusion formed by the second opening at one end of the active layer in the width direction is greater than or equal to 5 mm and less than or equal to 25 mm.

[0051] Specifically, setting the width of the protrusion to be greater than or equal to 5mm and less than or equal to 25mm can achieve the goal of the active layer being fully covered by the flame for flame treatment, while also reducing the side effects caused by the flame from the second opening spreading to areas that do not require flame treatment.

[0052] In some embodiments, the extension direction of the flame guiding channel is inclined or bent relative to the extension direction of the flame outlet; the step of flame treating the surface of the battery electrode preform includes:

[0053] The battery electrode preform is moved in a direction that is inclined or bent relative to the second opening toward the flame guide channel.

[0054] Specifically, the flame guide channel can guide the direction of the flame ejected from the second opening. By setting the battery electrode preform to move in a tilted or bent direction relative to the second opening towards the flame guide channel, the influence of the airflow driven by the movement of the battery electrode preform on the flame's "tailing" effect can be reduced, thereby improving the flame's morphological stability.

[0055] In some embodiments, the flame treatment employs a flame treatment apparatus according to any one of the foregoing descriptions; the step of positioning the second opening of the flame guiding channel toward the active layer at intervals includes:

[0056] The distance between the baffle and the active layer is 0.1 to 1 mm.

[0057] Specifically, in this embodiment, the distance between the baffle and the active layer is set to 0.1 to 1 mm, which reduces the probability of flame spreading in the height direction of the second opening and also reduces the probability of the baffle scratching the active layer. [Attached Image Description]

[0058] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0059] Figure 1 is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0060] Figure 2 is a schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from a single perspective.

[0061] Figure 3 is a cross-sectional view of the flame treatment device and battery electrode preform shown in Figure 2.

[0062] Figure 4 is a structural schematic diagram of the flame treatment device and battery electrode preform shown in Figure 2 from another perspective.

[0063] Figure 5 is a structural schematic diagram of the flame treatment device and battery electrode preform shown in Figure 2 from another perspective.

[0064] Figure 6 is a structural cross-sectional view of the flame treatment apparatus and battery electrode preform provided in some other embodiments of this application;

[0065] Figure 7 is a schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from a different perspective.

[0066] Figure 8 is a cross-sectional view of the flame treatment device and battery electrode preform shown in Figure 7.

[0067] Figure 9 is a schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from a different perspective.

[0068] Figure 10 is a structural cross-sectional view of the flame treatment device and battery electrode preform shown in Figure 9.

[0069] Figure 11 is a schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from a different perspective.

[0070] Figure 12 is a structural cross-sectional view of an embodiment of the flame treatment device and battery electrode preform shown in Figure 11;

[0071] Figure 13 is a structural cross-sectional view of another embodiment of the flame treatment device and battery electrode preform shown in Figure 11;

[0072] Figure 14 is a schematic flowchart of a method for preparing battery electrode sheets according to some embodiments of this application;

[0073] Figure 15 is a flowchart illustrating some embodiments of step S2 in Figure 14.

[0074] Reference numerals: Several battery cells - 100; Casing - 101, Electrode assembly - 102; Cover plate - 103; Pressure relief mechanism - 104; Terminal post - 105; Connecting component - 106; 1-Battery electrode preform; 11-Active layer; 12-Current collector; 2-Flame treatment device; 20-Burner; 21-Premixing chamber; 22-Flame outlet; 23-Flame stabilizer; 231-Flame guide channel; 232-First opening; 233-Second opening; 234-Cover; 235-Separator; α-Inclination angle; X1-Thickness direction; X2-Width direction; X3-Height direction; X4-Length direction.

Detailed Implementation Methods

[0075] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0076] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0077] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0078] In the description of the embodiments in this application, 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0079] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0080] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0081] Batteries are widely used in daily life. A battery cell refers to the smallest unit that makes up a battery.

[0082] Referring to Figure 1, the battery cell 100 may include a housing 101, an electrode assembly 102, and a cover 103. The housing 101 has a communicating cavity and a mounting port. The number of electrode assemblies 102 may be one or more; the electrode assemblies 102 are mounted within the cavity of the housing 101. The cover 103 is connected to the housing 101 and covers the mounting port. The housing 101 is filled with an electrolyte, such as an electrolyte solution. The electrode assembly 102 may include a positive electrode and a negative electrode, and a separator disposed between the positive and negative electrode. During the charging and discharging process of the battery cell 100, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator can, to some extent, prevent short circuits between the positive and negative electrode while allowing active ions to pass through.

[0083] The battery cell 100 may further include a pressure relief mechanism 104, two terminals 105, and two connecting members 106 (also referred to as current collectors). The pressure relief mechanism 104 may be disposed on the cover plate 103, for example, the pressure relief mechanism 104 may be fixed to the cover plate 103. The pressure relief mechanism 104 is used to actuate and release the internal electrolyte when the internal pressure or temperature of the battery cell 100 reaches a threshold, thereby reducing the internal pressure or temperature of the battery cell 100. For example, the pressure relief mechanism 104 may be a temperature-sensitive valve, or for example, a pressure-sensitive valve. The two terminals 105 may be disposed on the cover plate 103, for example, the two terminals 105 may be fixed to the cover plate 103. The two terminals 105 are respectively a positive terminal 105 and a negative terminal 105. Each terminal 105 is correspondingly connected to a connecting member 106. The connecting member 106 is located between the cover plate 103 and the electrode assembly 102, and is used to electrically connect the electrode assembly 102 and the terminal 105.

[0084] The housing 101 is a hollow structure. The material of the housing 101 can be metal or plastic; for example, the material of the housing 101 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the housing 101 can be a steel shell, aluminum shell, plastic shell (such as polypropylene), composite metal shell (such as a copper-aluminum composite shell), or aluminum-plastic film, etc. The shape of the housing 101 can be determined according to the specific shape of the electrode assembly 102; for example, if the electrode assembly 102 is rectangular, then the housing 101 can be a rectangular shell; or, for example, if the electrode assembly 102 is cylindrical, then the housing 101 can be a cylindrical shell.

[0085] Each battery cell 100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 100 can be cylindrical, flat, cuboid, or other shapes.

[0086] Battery cells 100 can be assembled into battery modules and installed in a battery housing to form a battery device. In a battery module, there can be multiple battery cells 100, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 100 is housed within the housing 10. Alternatively, the battery module can be formed by first connecting multiple battery cells 100 in series, parallel, or a combination thereof to form a battery cell assembly, and then connecting these battery cell assemblies in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 10. The battery module may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 100.

[0087] The positive electrode includes a positive current collector and a positive active layer disposed on at least one surface of the positive current collector, the positive active layer comprising a positive active material. The negative electrode includes a negative current collector and a negative active layer disposed on at least one surface of the negative current collector, the negative active layer comprising a negative active material.

[0088] Developing a higher energy density battery cell 100 means filling more electrode active material into a smaller space, resulting in higher compaction density and lower porosity of the battery electrode sheets. Since the electrode slurry is not a stable system, when the electrode slurry is applied to the surface of the current collector (copper or aluminum foil) to form the active layer, the denser solid active material slowly settles, while the less dense binder floats. This results in a higher binder content on the surface of the battery electrode preform compared to areas further away from the surface. After subsequent drying and rolling, the battery electrode preform forms a smooth polymer film with a high binder content. This polymer film hinders electrolyte wetting and lithium ion diffusion, causing difficulties in adding electrolyte and poor rate performance, among other problems.

[0089] In the prior art, to solve the problem of polymer film on the surface of battery electrode preforms after rolling, the surface of the rolled battery electrode preforms is flame-treated to remove the polymer film formed by excessive binder on the surface of the active layer, forming micropores that lead to the current collector and improving the performance of the battery electrode.

[0090] Currently, flame treatment devices are commonly used to flame-treat battery electrode preforms. These devices typically have a premixing chamber and a flame outlet. Fuel and air enter the premixing chamber and mix, then the mixture is ejected through the flame outlet and combusted to form a flame, thus flame-treating the battery electrode preform. Generally, the distance between the flame outlet and the battery electrode preform is greater than 50 mm, for example, 50–100 mm. This relatively large distance makes the flame susceptible to external flow field influences, such as disturbances from ambient wind or movement of the battery electrode preform (carrier slippage), resulting in unstable flame morphology and low flame utilization efficiency, ultimately leading to poor flame treatment results for the battery electrode.

[0091] To address the aforementioned problems in flame treatment devices, this application provides a flame treatment device, including a burner and a flame stabilizer. The burner has a premixing chamber and a flame outlet that are interconnected. The flame stabilizer is disposed on the burner. The flame stabilizer has a flame guiding channel, one end of which has a first opening, and the other end has a second opening. The first opening communicates with the flame outlet and is used to guide the flame ejected from the flame outlet into the flame guiding channel, and then eject it through the second opening.

[0092] Specifically, by installing a flame stabilizer at the burner's outlet, the flame is less affected by the external flow field, improving the flame's morphological stability and flame utilization efficiency, thereby increasing the production efficiency of battery electrodes.

[0093] Referring to Figures 2-5, Figure 2 is a structural schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from one perspective; Figure 3 is a structural cross-sectional view of the flame treatment apparatus and battery electrode preform shown in Figure 2; Figure 4 is a structural schematic diagram of the flame treatment apparatus and battery electrode preform shown in Figure 2 from another perspective; and Figure 5 is a structural schematic diagram of the flame treatment apparatus and battery electrode preform shown in Figure 2 from yet another perspective. A first aspect of this application provides a flame treatment apparatus 2, including a burner 20 and a flame stabilizer 23. The burner 20 has a premixing chamber 21 and a flame outlet 22 that are interconnected; the flame stabilizer 23 is disposed on the burner 20; the flame stabilizer 23 has a flame guiding channel 231, one end of which has a first opening 232, and the other end has a second opening 233; the first opening 232 communicates with the flame outlet 22.

[0094] The burner 20 is a device capable of burning fuel and then ejecting a flame. The premixing chamber 21 is a cavity with a certain capacity inside the burner 20, where fuel and air can be mixed. The flame outlet 22 is a through-hole opened in the wall of the premixing chamber 21, used to eject the mixed gas and cause combustion to produce a flame. The shapes of the premixing chamber 21 and the flame outlet 22 can be designed as needed. In this embodiment, the premixing chamber 21 is rectangular, and three flat flame outlets 22 are spaced apart and linearly arranged along the length of the premixing chamber 21. The burner 20 can be made of high-temperature resistant materials such as metal.

[0095] The flame stabilizer 23 is a device used to stabilize a flame. It ensures that the flame can burn or spray stably at a specific location and with a specific morphology by changing the flame flow characteristics. The flame stabilizer 23 is usually installed near the flame outlet 22 to help the flame form and maintain a stable morphology. It is understood that the stable morphology in this application is relative to the absence of the flame stabilizer 23, because it is difficult for a flame to maintain a definite morphology like a solid.

[0096] Specifically, the flame stabilizer 23 can be a cylindrical body formed by an annular sidewall or a hollow structure formed by hollowing out the interior of a solid. The flame stabilizer 23 has a flame guiding channel 231, the first opening 232 of which communicates with the flame outlet 22, for guiding the flame ejected from the flame outlet 22 into the flame guiding channel 231, and then ejecting it from the second opening 233 after being guided by the flame guiding channel 231. The shape of the flame guiding channel 231 can be designed as needed. In this embodiment, the flame guiding channel 231 is flat, so that the ejected flame is flat, which facilitates the flame treatment of the active layer 11 of the battery electrode preform 1.

[0097] The flame stabilizer 23 can be fixedly connected to the burner 20, for example, by welding; or the flame stabilizer 23 can be detachably connected to the burner 20, for example, by snap-fit, for easy replacement and cleaning; or the flame stabilizer 23 can be integrally molded with the burner 20, for example, the flame stabilizer 23 can be part of the outer shell of the burner 20, and this is not limited thereto. The flame stabilizer 23 can be made of high-temperature resistant materials such as high-temperature resistant steel, alumina, and silicon carbide.

[0098] Specifically, by adding a flame stabilizer 23 to the flame outlet 22 of the burner 20, the flame is less affected by the external flow field, improving the morphological stability of the flame and increasing the flame utilization efficiency, thereby improving the flame treatment effect on the battery electrode preform 1.

[0099] Furthermore, by installing a flame stabilizer 23 at the flame outlet 22 of the burner 20, the following effects are also achieved:

[0100] Effect 1: The flame is easily affected by the movement of the battery electrode preform 1, causing a "tailing" problem; by adding a flame stabilizer 23 at the flame outlet 22 of the burner 20, the distance between the second opening 233 of the flame stabilizer 23 and the battery electrode preform 1 is less than the distance between the flame outlet 22 and the battery electrode preform 1, thereby reducing the "tailing" problem of the flame caused by the movement of the battery electrode preform 1 and improving the morphological stability of the flame.

[0101] Effect 2: The flame temperature is easily affected by the external environment and the consistency of the gas ejected from the flame outlet 22, resulting in poor flame temperature consistency. By adding a flame stabilizer 23 at the flame outlet 22 of the burner 20, the flame stabilizer 23 can achieve a uniform flow effect and improve the consistency of the flame.

[0102] Effect 3: The flame combustion area is difficult to control and is prone to burning unwanted areas such as the electrode substrate (e.g., current collector 12); by adding a flame stabilizer 23 at the flame outlet 22 of the burner 20, the flame stabilizer 23 can play a guiding role and improve the controllability of the flame combustion area.

[0103] Effect 4: Unconcentrated flame combustion area leads to energy waste; by adding a flame stabilizer 23 at the flame outlet 22 of the burner 20, the flame stabilizer 23 can concentrate the flame combustion area, thereby improving energy utilization.

[0104] Please refer to Figures 2-5, where Figure 4 can be understood as a top view of the flame treatment device 2, and Figure 5 can be understood as a front view of the flame treatment device 2. In some embodiments, the flame guiding channel 231 is a straight channel; the extending direction of the flame guiding channel 231 is the same as the extending direction of the flame outlet 22.

[0105] In this embodiment, the straight channel guides the flame guide channel 231 to extend along a straight line from one end of the flame stabilizer 23 to the opposite end. For example, the flame guide channel 231 is cylindrical or prismatic. In one embodiment, the flame guide channel 231 is a quadrangular prism with a rectangular cross-section, i.e., the flame guide channel 231 has a flat structure. This design can reduce the resistance of the flame jet within the flame guide channel 231, improve efficiency, and simplify the system structure.

[0106] In this embodiment, the extension direction of the flame guide channel 231 is the same as the extension direction of the flame outlet 22, meaning that the axis of the flame outlet 22 is parallel to the axis of the flame guide channel 231. In one embodiment, the flame outlet 22 and the flame guide channel 231 are coaxially arranged.

[0107] Specifically, by setting the flame guide channel 231 as a straight channel, and the extension direction of the flame guide channel 231 is the same as the extension direction of the flame outlet 22, the flame ejected from the flame outlet 22 can be directly ejected along the straight channel, reducing the resistance of the flame ejection in the flame guide channel 231, thereby improving the flame treatment efficiency of the battery electrode preform 1.

[0108] Referring to Figure 6, which is a structural cross-sectional view of the flame treatment apparatus and battery electrode preform provided in some other embodiments of this application; in some other embodiments, the flame guiding channel 231 is a straight channel; the extending direction of the flame guiding channel 231 is inclined relative to the extending direction of the flame outlet 22.

[0109] In this embodiment, the extension direction of the flame guiding channel 231 is inclined relative to the extension direction of the flame outlet 22, meaning that the axis of the flame outlet 22 is not parallel to the axis of the flame guiding channel 231. Specifically, in one embodiment, the flame guiding channel 231 is flat, and the extension direction of the flame guiding channel 231 is inclined in the thickness direction X1 of the flame guiding channel 231 relative to the extension direction of the flame outlet 22, to facilitate flame treatment of the battery electrode preform 1.

[0110] Specifically, since the battery electrode preform 1 moves in a certain direction during flame treatment, the flame will have a "tailing" problem in the direction of movement of the battery electrode preform 1. This application solves this problem by setting the flame guiding channel 231 as a straight channel and the extension direction of the flame guiding channel 231 is inclined relative to the extension direction of the flame outlet 22, for example, inclined towards the direction of movement of the battery electrode preform 1. This allows the flame guiding channel 231 to guide the direction of the flame ejected from the second opening 233 towards the direction of movement of the battery electrode preform 1, thereby further mitigating the "tailing" problem of the flame caused by the movement of the battery electrode preform 1.

[0111] In some embodiments, the angle α at which the extension direction of the flame guide channel 231 is inclined relative to the extension direction of the flame outlet 22 is 5 to 30°.

[0112] In this embodiment, the angle of inclination of the extension direction of the flame guide channel 231 relative to the extension direction of the flame outlet 22 is the angle between the axis of the flame outlet 22 and the axis of the flame guide channel 231. For example, the angle α of inclination of the extension direction of the flame guide channel 231 relative to the extension direction of the flame outlet 22 can be 5°, 10°, 15°, 20°, 25° or 30°, etc., and is not limited here. It can be selected according to actual needs.

[0113] In this embodiment, the extension direction of the flame guide channel 231 is tilted at an angle α of 5 to 30° relative to the extension direction of the flame outlet 22. This can reduce the waste of flame heat caused by excessive tilting, thereby reducing energy consumption, and also ensure that the direction in which the flame moves toward the battery electrode preform 1 has a sufficient tilt, which can further improve the "tailing" problem of the flame caused by the movement of the battery electrode preform 1.

[0114] In some embodiments, the extension direction of the flame guide channel 231 is curved relative to the extension direction of the flame outlet 22.

[0115] In this embodiment of the application, the extension direction of the flame guide channel 231 is curved relative to the extension direction of the flame outlet 22, which means that the flame outlet 22 is a straight hole and the flame guide channel 231 is curved.

[0116] Specifically, by setting the extension direction of the flame guide channel 231 to bend relative to the extension direction of the flame outlet 22, for example, bending towards the moving direction of the battery electrode preform 1, the flame guide channel 231 can guide the direction in which the flame is ejected from the second opening 233 to tilt towards the moving direction of the battery electrode preform 1, thereby reducing the "tailing" problem of the flame caused by the movement of the battery electrode preform 1.

[0117] Referring to Figures 7 and 8, Figure 7 is a structural schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from a certain perspective; Figure 8 is a structural cross-sectional view of the flame treatment apparatus and battery electrode preform shown in Figure 7; in some embodiments, the flame guiding channel 231 is curved into an arc shape.

[0118] In this embodiment of the application, the flame guiding channel 231 is curved in an arc shape, which means that the flame guiding channel 231 is an arc shape, for example, the central angle of the arc is less than 180 degrees.

[0119] Specifically, when the flame guide channel 231 is curved and extended, the arc-shaped flame guide channel 231 can reduce the energy loss of the flame in the flame guide channel 231 and improve the morphological stability of the flame.

[0120] In some embodiments, the curvature of the arc is 4–20 m. -1 .

[0121] In this embodiment, the curvature of the arc refers to the reciprocal of the radius of the arc. For example, the curvature of the arc can be 4m. -1 8m -1 12m -1 16m -1 Or 20m -1 The specific options are not limited here, and can be selected according to actual needs.

[0122] In this embodiment, the arc-shaped flame guide channel 231 has a curvature of 4–20 m. -1 This can reduce the waste of flame heat caused by excessive bending, thereby reducing energy consumption, and also allow the flame to have sufficient curvature in the direction of movement of the battery electrode preform 1, which can further improve the "tailing" problem of the flame caused by the movement of the battery electrode preform 1.

[0123] Referring to Figures 6-8, in some embodiments, the flame guiding channel 231 has a flat structure; the extending direction of the flame guiding channel 231 is inclined or bent to one side in the thickness direction X1 of the flame guiding channel 231 relative to the extending direction of the flame outlet 22.

[0124] In this embodiment, the flame guide channel 231 being a flat structure means that the cross-sectional shape of the flame guide channel 231 includes two long sides and two short sides, and in particular, the length of the long sides is more than twice the length of the short sides. The two long sides are straight lines, and the two short sides can be straight lines or curves. For example, both the two long sides and the two short sides can be straight lines, that is, the cross-sectional shape of the flame guide channel 231 is a long rectangular strip.

[0125] Specifically, the flame guiding channel 231 is designed with a flat structure. This flat shape allows for uniform flame flow and control over the combustion zone. The emitted flame is also flat. By moving the battery electrode preform 1 along the thickness direction X1 of the flame guiding channel 231, the flame treatment effect on the battery electrode preform 1 is improved. Furthermore, the extension direction of the flame guiding channel 231 is tilted or bent to one side in the thickness direction X1, for example, towards the direction of movement of the battery electrode preform 1. This further mitigates the "tailing" problem of the flame caused by the movement of the battery electrode preform 1.

[0126] Specifically, the flow equalization principle of the flame stabilizer 23 is as follows: the flame ejected from the flame outlet 22 expands as it burns in the flame stabilizer 23, and the flame ejected from the flame outlet 22 is similar to a jet. The ejected flame will have a suction effect, which will drive the surrounding airflow. The flame achieves a flow equalization effect in the narrow flame stabilizer 23. Secondly, the flame stabilizer 23 blocks the interference of external airflow. Therefore, the flame stabilizer 23 can achieve a flow equalization effect.

[0127] Referring to Figures 9 and 10, Figure 9 is a structural schematic diagram of the flame treatment device and battery electrode preform provided in some embodiments of this application from a certain perspective; Figure 10 is a structural cross-sectional view of the flame treatment device and battery electrode preform shown in Figure 9; in some embodiments, the flame stabilizer 23 is further provided with two baffles 24 at one end away from the burner 20, and the two baffles 24 are provided at opposite ends of the second opening 233 along the width direction X2 of the second opening 233.

[0128] Specifically, in this embodiment, the second opening 233 has a width direction X2 and a height direction X3 that are perpendicular to each other. The width direction X2 can be perpendicular to the moving direction of the battery electrode preform, and the height direction X3 is the same as the moving direction of the battery electrode preform. That is to say, the height direction X3 of the second opening 233 is the same as the thickness direction X1 of the flame guiding channel 231.

[0129] In this embodiment, the baffle 24 is a plate-like structure, whose main function is to limit the spread of the flame ejected from the second opening 233. The material of the baffle 24 can be the same as that of the flame stabilizer 23. The baffle 24 and the flame stabilizer 23 can be fixedly connected, detachably connected, or integrally formed.

[0130] Specifically, the two baffles 24 reduce the probability that the flame ejected from the second opening 233 will spread in the width direction X2 of the second opening 233 toward the area outside the flame guide channel 231, thereby reducing the side effects (e.g., oxidation) caused by the flame spreading to areas that do not require flame treatment (such as the area of ​​the current collector 12 not covered by the active layer 11).

[0131] It should be noted that in one embodiment, there is no baffle 24 at the second opening 233 along the height direction X3 of the second opening 233. This is because when the battery electrode preform 1 moves along the height direction X3 of the second opening 233, the flame spreading along the height direction X3 of the second opening 233 will still fall on the active layer 11 and perform flame treatment on the active layer 11.

[0132] Referring to Figures 11 and 12, Figure 11 is a structural schematic diagram of the flame treatment apparatus and battery electrode preform provided in some embodiments of this application from a certain perspective; Figure 12 is a structural cross-sectional view of an embodiment of the flame treatment apparatus and battery electrode preform shown in Figure 11; in some embodiments, the baffle 24 extends along the height direction X3 of the second opening 233 to the opposite ends of the second opening 233 and protrudes from the second opening 233.

[0133] Specifically, the baffle 24 is further configured to extend along the height direction X3 of the second opening 233 to the opposite ends of the second opening 233 and protrude from the second opening 233. The baffle 24 restricts the flame from spreading outside the width direction X2 of the second opening 233 to a larger extent. Thus, when the battery electrode preform 1 moves, the baffle 24 can further improve the spread of the flame ejected from the second opening 233 towards the area outside the flame guide channel 231 in the width direction X2 of the second opening 233, thereby further reducing the side effects caused by the flame spreading to the area that does not require flame treatment.

[0134] Referring to Figure 12, in some embodiments, the length L1 of the baffle 24 protruding from one end of the second opening 233 along the height direction X3 of the second opening 233 is 25 to 100 mm.

[0135] The length L1 of the baffle 24 protruding from one end of the second opening 233 along the height direction X3 of the second opening 233 can be 25mm, 50mm, 75mm or 100mm, etc., and is not limited here. It can be selected according to actual needs.

[0136] In this embodiment, the baffle 24 is set to protrude a length L1 of 25-100mm along the height direction X3 of the second opening 233 at one end of the second opening 233. This simplifies the structure of the flame stabilizer 23 and controls costs, while also ensuring that the baffle 24 protrudes a sufficient length along the height direction X3 of the second opening 233 at one end of the second opening 233, thereby more effectively reducing the probability of flame spreading to areas that do not require flame treatment.

[0137] Referring to Figure 13, which is a structural cross-sectional view of another embodiment of the flame treatment apparatus and battery electrode preform shown in Figure 11; in some embodiments, the protruding length of the baffle 24 on one side of the height direction X3 of the second opening 233 is greater than the protruding length on the other side; the extension direction of the flame guide channel 231 is inclined or bent towards the side with the larger protruding length of the baffle 24 in the thickness direction X1 of the flame guide channel 231 relative to the extension direction of the flame outlet 22.

[0138] Specifically, the direction of the flame ejected from the second opening 233 is guided by the flame guide channel 231. Therefore, the direction of the flame ejected from the second opening 233 is the same as the tilting or bending direction of the flame guide channel 231. By setting the flame guide channel 231 to tilt or bend towards the side with a larger protruding length of the baffle 24, this embodiment of the application can reduce the side effects caused by the flame ejected from the second opening 233 having a long flame tail in the tilting or bending direction of the flame guide channel 231, which would lead to the flame spreading to areas that do not require flame treatment.

[0139] Referring to Figures 2-5, in some embodiments, the flame outlet 22 has a flat structure, the width W1 of the first opening 232 is greater than the width W2 of the flame outlet 22 and is greater than 1-3 mm, the height H1 of the first opening 232 is greater than the height H2 of the flame outlet 22 and is greater than 1-3 mm, the length L2 of the flame guiding channel 231 is 25-45 mm, and the length L3 of the flame outlet 22 is 10-30 mm.

[0140] Specifically, in this embodiment, the flame guiding channel 231 is a straight channel, the first opening 232 has a width direction X2 and a height direction X3 that are perpendicular to each other, and the width direction X2 and height direction X3 of the first opening 232 correspond to the width direction X2 and height direction X3 of the second opening 233.

[0141] In this embodiment, the length direction X4 of the flame outlet 22 is the direction in which the flame outlet 22 faces the flame stabilizer 23. The length direction X4 of the flame guiding channel 231 is the same as the extension direction of the flame guiding channel 231.

[0142] For example, the width W1 of the first opening 232 can be 1mm, 2mm or 3mm wider than the width of the flame outlet 22, etc., without limitation, and can be selected according to actual needs.

[0143] For example, the height H1 of the first opening 232 can be 1mm, 2mm or 3mm greater than the height of the flame outlet 22, etc., without limitation, and can be selected according to actual needs.

[0144] For example, the length L2 of the flame guide channel 231 can be 25mm, 30mm, 35mm, 40mm or 45mm, etc., and is not limited here. It can be selected according to actual needs.

[0145] For example, the length L3 of the flame outlet 22 can be 10mm, 15mm, 20mm, 25mm or 30mm, etc., and is not limited here. It can be selected according to actual needs.

[0146] Specifically, the flame outlet 22 is designed with a flat structure. The flat shape of the flame outlet 22 is beneficial for controlling the combustion zone and improving the flame treatment effect on the electrode plates. Furthermore, the width W1 of the first opening 232 is greater than the width W2 of the flame outlet 22, and the height H1 of the first opening 232 is greater than the height H2 of the flame outlet 22. This ensures that the flame ejected from the flame outlet 22 can be completely received into the flame guiding channel 231 by the first opening 232, reducing the energy loss of the flame as it enters the flame guiding channel 231 from the flame outlet 22. In addition, the length of the flame guiding channel 231 is set to 25-45 mm, and the length of the flame outlet 22 is set to 10-30 mm. Within this length range, the consistency of the flame can be improved.

[0147] Referring to Figures 2 and 3, in some embodiments, the burner 20 has a plurality of flame outlets 22 spaced apart; the flame stabilizer 23 includes a cover 234 and a plurality of partition plates 235 disposed within the cover 234. The plurality of partition plates 235 divide the space within the cover 234 into a plurality of flame guiding channels 231. The plurality of flame guiding channels 231 correspond one-to-one with the plurality of flame outlets 22, and the first opening 232 of each flame guiding channel 231 covers one flame outlet 22.

[0148] Specifically, through the above design, the flame treatment device 2 can simultaneously process multiple battery electrode areas A1 on the battery electrode preform 1, thereby improving processing efficiency.

[0149] In some embodiments, the partition plates 235 of two adjacent flame guide channels 231 are spaced apart.

[0150] Specifically, through the above settings, the interval area between the partition plates 235 of two adjacent flame guide channels 231 can correspond to the area that does not require flame treatment, thereby reducing the side effects caused by the flame spreading to the area that does not require flame treatment.

[0151] Referring to Figure 14, Figure 14 is a schematic flowchart of a method for preparing a battery electrode according to some embodiments of this application. A second aspect of this application provides a method for preparing a battery electrode, comprising:

[0152] Step S1: Prepare battery electrode preform 1.

[0153] Step S2: Flame treat the surface of the battery electrode preform 1.

[0154] In step S1, the preparation of the battery electrode preform 1 includes coating an active material onto the current collector 12, drying it, and rolling it.

[0155] Specifically, the battery electrode preform 1 includes several battery electrode regions A1, each battery electrode region A1 including a current collector 12 and an active layer 11, and each battery electrode region A1 is used to form a battery electrode.

[0156] Among them, the current collector 12 includes, but is not limited to, copper foil, aluminum foil, etc.

[0157] The active layer 11 is disposed on at least one surface of the current collector 12, and the material of the active layer 11 includes, but is not limited to, one or more of graphite, nano-silicon, silicon suboxide, lithium iron phosphate, lithium nickel cobalt manganese oxide, lithium nickel oxide, lithium cobalt oxide, lithium nickel cobalt aluminum oxide, and lithium manganese oxide.

[0158] Specifically, in step S2, the active layer 11 of each battery electrode region A1 is flame-treated. The flame treatment is performed using any of the flame treatment devices 2 described above.

[0159] Specifically, the flame treatment device 2 described above is used to flame treat the electrode preform, so that the flame ejected from the flame outlet 22 by the flame treatment device 2 is less affected by the external flow field, which improves the morphological stability, consistency and controllability of the combustion zone of the flame, thereby improving the flame utilization efficiency and thus improving the flame treatment effect on the battery electrode preform 1.

[0160] Referring to Figure 15, which is a flowchart illustrating some embodiments of step S2 in Figure 14, in some embodiments, the step of flame treating the surface of the battery electrode preform 1 includes:

[0161] Step S21: The second opening 233 of the flame guiding channel 231 is positioned at intervals toward the active layer 11; wherein the distance between the second opening 233 of the flame guiding channel 231 and the active layer 11 is 5 to 25 mm.

[0162] Step S22: Flame is ejected from the second opening 233 of the flame guide channel 231.

[0163] Referring to Figure 5, for example, the distance D1 between the second opening 233 of the flame guiding channel 231 and the active layer 11 can be 5mm, 10mm, 15mm, 20mm or 25mm, etc., which is not limited here, and can be selected according to actual needs.

[0164] In this embodiment, the distance D1 between the second opening 233 of the flame guiding channel 231 and the active layer 11 is set to 5-25 mm. This not only improves the problem of flame "tailing" caused by the movement of the battery electrode preform 1, but also reduces the probability of scratching the active layer 11 due to the small distance D1 between the second opening 233 of the flame guiding channel 231 and the active layer 11.

[0165] In some embodiments, the width W3 of the second opening 233 is smaller than the width W4 of the active layer 11; the step of positioning the second opening 233 of the flame guiding channel 231 at intervals toward the active layer 11 includes:

[0166] The active layer 11 protrudes from the second opening 233 at both ends in the width direction X2.

[0167] Specifically, to reduce the probability of scratching the active layer 11 due to an excessively small distance D1 between the second opening 233 of the flame guiding channel 231 and the active layer 11, a certain distance D1 needs to be maintained between them. Since the flame may also diffuse outwards along the width direction X2 of the second opening 233 within this distance D1, both ends of the active layer 11 protrude from the second opening 133 in the width direction X2. This allows the flame diffusing in the width direction X2 to treat the protruding areas of the active layer 11 at both ends, reducing the probability of flame diffusing into areas that do not require flame treatment, improving flame utilization, and increasing the efficiency of electrode production.

[0168] In some embodiments, the width of the protrusion formed by the second opening 233 at one end of the active layer 11 in the width direction X2 is greater than or equal to 5 mm and less than or equal to 25 mm.

[0169] That is, in the width direction X2 of the active layer 11, the distance between the junction of the active layer 11 and the current collector 12 and the second opening 233 is greater than or equal to 5 mm and less than or equal to 25 mm.

[0170] For example, the width of the protrusion formed by the second opening 233 at one end of the active layer 11 in the width direction X2 can be 5mm, 10mm, 15mm, 20mm or 25mm, etc., without limitation, and can be selected according to actual needs.

[0171] In this embodiment, the width of the protrusion is greater than or equal to 5 mm and less than or equal to 25 mm. This allows the active layer 11 to be fully covered by the flame for flame treatment, while also reducing the side effects caused by the flame ejected from the second opening 233 spreading to areas that do not require flame treatment.

[0172] In some embodiments, the extending direction of the flame guide channel 231 is inclined or bent relative to the extending direction of the flame outlet 22; the step of flame treating the surface of the battery electrode preform 1 includes:

[0173] The battery electrode preform 1 is moved in a direction that is tilted or bent relative to the second opening 233 to guide the flame channel 231.

[0174] Specifically, the flame guide channel 231 can guide the direction of the flame ejected from the second opening 233. The battery electrode preform 1 is set to move in a tilted or bent direction relative to the second opening 233 towards the flame guide channel 231, thereby reducing the "tailing" effect of the airflow driven by the movement of the battery electrode preform 1 on the flame, thereby improving the morphological stability of the flame.

[0175] In some embodiments, flame treatment employs a flame treatment apparatus 2 according to any one of the above; the step of positioning the second opening 233 of the flame guide channel 231 at intervals toward the active layer 11 includes:

[0176] The distance between the baffle 24 and the active layer 11 is 0.1 to 1 mm.

[0177] For example, the distance between the baffle 24 and the active layer 11 can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, or 1mm, etc., which is not limited here and can be selected according to actual needs.

[0178] Specifically, in this embodiment, the distance between the baffle 24 and the active layer 11 is set to 0.1-1 mm. This not only reduces the probability of flame spreading in the height direction X3 of the second opening 233, but also reduces the probability of the baffle 24 scratching the active layer 11.

[0179] In a first specific embodiment of this application, the flame treatment device 2 includes a burner 20 and a flame stabilizer 23. The burner 20 has a premixing chamber 21 and flame outlets 22 that are interconnected, and there are multiple flame outlets 22 that are spaced apart. The flame stabilizer 23 includes a cover 234 and multiple partition plates 235 disposed within the cover 234. The multiple partition plates 235 divide the space within the cover 234 into multiple flame guiding channels 231. The multiple flame guiding channels 231 correspond one-to-one with the multiple flame outlets 22, and the first opening 232 of each flame guiding channel 231 covers one flame outlet 22.

[0180] Among them, the flame outlet 22, the flame stabilizer 23, and the flame guide channel 231 are all flat structures.

[0181] The battery electrode preform 1 includes multiple battery electrode regions A1, each battery electrode region A1 including a current collector 12 and an active layer 11 disposed on at least one surface of the current collector 12. The flame ejected from the second opening 233 is used to flame treat the active layer 11.

[0182] Among them, the flame guiding channel 231 is a straight channel; the extension direction of the flame guiding channel 231 is the same as the extension direction of the flame outlet 22.

[0183] The width of the first opening 232 is 1-3 mm wider than the width of the flame outlet 22; the length of the flame guiding channel 231 is 25-45 mm; the length of the flame guiding channel 231 should not be too long or too short, as excessive length can easily lead to poor flame uniformity; the actual length should be adjusted according to the flow rate of the flame outlet 22; the distance between the second opening 233 of the flame guiding channel 231 and the active layer 11 is 5-25 mm; the width of the protrusion formed by the second opening 233 at one end of the active layer 11 in the width direction X2 is less than or equal to 25 mm.

[0184] In the second embodiment of this application, the difference from the first embodiment is that the extension direction of the flame guide channel 231 is curved in an arc shape relative to the extension direction of the flame outlet 22, and the curvature of the arc is 4 to 20 μm. -1 .

[0185] The battery electrode preform 1 moves along the curvature of the flame guide channel 231 (belt travel), and the belt travel speed is 30-150m / s.

[0186] In the third embodiment of this application, the difference from the first embodiment is that two baffles 24 are provided at the end of the flame stabilizer 23 away from the burner 20. The two baffles 24 are disposed at opposite ends of the second opening 233 along the width direction X2 of the second opening 233. The distance between the baffles 24 and the active layer 11 is 0.1 to 1 mm.

[0187] In the fourth embodiment of this application, the difference from the first embodiment is that the flame stabilizer 23 is provided with two baffles 24 at the end away from the burner 20. The two baffles 24 are provided at the opposite ends of the second opening 233 along the width direction X2 of the second opening 233, and the baffles 24 extend to the opposite ends of the second opening 233 along the height direction X3 of the second opening 233 and protrude from the second opening 233.

[0188] The baffle 24 protrudes from one end of the second opening 233 along the height direction X3 of the second opening 233 for a length of 25 to 100 mm. The distance between the baffle 24 and the active layer 11 is 0.1 to 1 mm.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A flame treatment apparatus, wherein, include: The burner has an interconnected premixing chamber and a flame outlet; A flame stabilizer is installed on the burner; The flame stabilizer has a flame guiding channel, one end of which has a first opening and the other end has a second opening; the first opening is connected to the flame outlet.

2. The flame treatment apparatus according to claim 1, wherein, The flame guiding channel is a straight channel; the extending direction of the flame guiding channel is the same as the extending direction of the flame outlet, or the extending direction of the flame guiding channel is inclined relative to the extending direction of the flame outlet.

3. The flame treatment apparatus according to claim 2, wherein, The extension direction of the flame guide channel is inclined at an angle of 5 to 30° relative to the extension direction of the flame outlet.

4. The flame treatment apparatus according to claim 1, wherein, The extension direction of the flame guide channel is curved relative to the extension direction of the flame outlet.

5. The flame treatment apparatus according to claim 4, wherein, The flame guide channel is curved in an arc shape.

6. The flame treatment apparatus according to claim 5, wherein, The curvature of the arc is 4–20 m. -1 .

7. The flame treatment apparatus according to claim 1, wherein, The flame guiding channel has a flat structure; the extension direction of the flame guiding channel is inclined or bent to one side relative to the extension direction of the flame outlet in the thickness direction of the flame guiding channel.

8. The flame treatment apparatus according to claim 1, wherein, Two baffles are also provided at the end of the flame stabilizer away from the burner, and the two baffles are arranged at opposite ends of the second opening along the width direction of the second opening.

9. The flame treatment apparatus according to claim 8, wherein, The baffle extends along the height direction of the second opening to opposite ends of the second opening and protrudes from the second opening.

10. The flame treatment apparatus according to claim 9, wherein, The baffle protrudes 25–100 mm from one end of the second opening along the height direction of the second opening.

11. The flame treatment apparatus according to claim 9, wherein, The protruding length of the baffle on one side of the height direction of the second opening is greater than the protruding length on the other side; the extension direction of the flame guide channel is inclined or bent towards the side of the baffle with a larger protruding length in the thickness direction of the flame guide channel, relative to the extension direction of the flame outlet.

12. The flame treatment apparatus according to any one of claims 1-11, wherein, The flame outlet has a flat structure. The width of the first opening is 1-3 mm greater than the width of the flame outlet, and the height of the first opening is 1-3 mm greater than the height of the flame outlet. The length of the flame guiding channel is 25-45 mm, and the length of the flame outlet is 10-30 mm.

13. The flame treatment apparatus according to any one of claims 1-11, wherein, The burner has a plurality of flame outlets spaced apart; the flame stabilizer includes a cover body and a plurality of partition plates disposed within the cover body, the plurality of partition plates dividing the space within the cover body into a plurality of flame guiding channels, the plurality of flame guiding channels corresponding one-to-one with the plurality of flame outlets, and the first opening of each flame guiding channel covering one of the flame outlets.

14. The flame treatment apparatus according to claim 13, wherein, The partition plates of two adjacent flame guide channels are spaced apart.

15. A method for preparing a battery electrode, wherein, include: Preparation of battery electrode preforms; The battery electrode preform includes a current collector and an active layer; The surface of the battery electrode preform is subjected to flame treatment; wherein the flame treatment is performed using the flame treatment apparatus according to any one of claims 1-14.

16. The method for preparing the battery electrode according to claim 15, wherein, The step of flame treating the surface of the battery electrode preform includes: The second opening of the flame guiding channel is positioned at an interval toward the active layer; wherein the distance between the second opening of the flame guiding channel and the active layer is 5–25 mm. Flames are ejected from the second opening of the flame guide channel.

17. The method for preparing battery electrode sheets according to claim 16, wherein, The width of the second opening is smaller than the width of the active layer; The step of positioning the second opening of the flame guiding channel toward the active layer at intervals includes: The active layer is made to protrude from the second opening at both ends in the width direction.

18. The method for preparing the battery electrode according to claim 17, wherein, The width of the protrusion formed by the second opening at one end of the active layer in the width direction is greater than or equal to 5 mm and less than or equal to 25 mm.

19. The method for preparing a battery electrode according to claim 16, wherein, The extension direction of the flame guiding channel is inclined or bent relative to the extension direction of the flame outlet; the step of flame treating the surface of the battery electrode preform includes: The battery electrode preform is moved in a direction that is inclined or bent relative to the second opening toward the flame guide channel.

20. The method for preparing the battery electrode according to claim 16, wherein, The flame treatment is performed using the flame treatment apparatus according to any one of claims 8-11; The step of positioning the second opening of the flame guiding channel toward the active layer at intervals includes: The distance between the baffle and the active layer is 0.1 to 1 mm.

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