Stripping equipment and stripping method for battery pole piece
By using water vapor to separate active materials and current collectors through battery electrode stripping equipment, the problems of pollution and high cost in existing technologies have been solved, and pollution-free and low-cost battery recycling has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-06
- Publication Date
- 2026-04-14
AI Technical Summary
Existing methods for stripping lithium-ion battery electrodes suffer from serious pollution and high costs, making it difficult to meet the needs of battery recycling.
A battery electrode stripping device is used, which includes a housing, a heating device and an electrode fixing device. Water vapor is generated by heating water and its rate is controlled so that it acts on the surface of the battery electrode to separate the active material from the current collector, avoiding the use of chemical solvents.
It achieves pollution-free and low-cost separation of active substances from current collectors, improves the integrity of the active substances after stripping, and meets the raw material quality requirements.
Smart Images
Figure CN121847569A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery recycling technology, specifically to a battery electrode stripping device and stripping method. Background Technology
[0002] With the rapid development of the new energy industry, lithium-ion batteries have become the core energy carrier for electric vehicles, energy storage systems, and consumer electronics. This large-scale application has led to a corresponding increase in the volume of retired batteries. The recycling of retired lithium-ion batteries is of strategic significance in alleviating resource shortages and reducing environmental pollution.
[0003] In related technologies, lithium-ion battery electrodes are composed of current collectors (aluminum or copper foil) and active materials bonded together with an adhesive. The current collectors and active materials are then separated using a chemical stripping method. However, chemical stripping methods suffer from problems such as severe pollution or excessive cost, making it difficult to meet the recycling needs of batteries. Summary of the Invention
[0004] To address the aforementioned technical problems, this application provides a battery electrode stripping device and method, which can reduce pollution and stripping costs to meet the battery recycling needs.
[0005] In a first aspect, this application provides a battery electrode stripping device, the stripping device comprising: a housing, a heating device located within the housing, and an electrode fixing device;
[0006] The heating device is located at the bottom of the housing and is used to heat water to generate water vapor for stripping the battery electrodes.
[0007] The electrode fixing device is located at the top of the housing and is used to fix the battery electrode above the heating device;
[0008] During the peeling process of the battery electrode, the rate of water vapor generation is controlled by adjusting the operating temperature of the heating device, so that the water vapor acts on the surface of the battery electrode to separate the active material and the current collector of the battery electrode.
[0009] In one alternative embodiment, the housing includes a body and a cover, the cover being provided with a vent or a pressure relief valve; during the process of peeling off the battery electrode, the vent or pressure relief valve is used to balance the pressure inside and outside the housing, so that water vapor acts on the surface of the battery electrode from bottom to top, thereby separating the active material and the current collector of the battery electrode.
[0010] In one alternative embodiment, the electrode fixing device includes a bracket and a clamp; the bracket is connected to the housing cover; one end of the clamp is connected to the bracket, and the other end of the clamp is used to fix the battery electrode above the heating device.
[0011] Secondly, this application provides a method for peeling off battery electrodes, applied to the aforementioned battery electrode peeling equipment, the peeling method comprising:
[0012] The battery electrode is placed inside the housing and fixed above the heating device using an electrode fixing device;
[0013] A preset volume of distilled water is injected into the heating device and heated to generate water vapor for stripping the battery electrodes.
[0014] The rate of water vapor generation is controlled by adjusting the operating temperature of the heating device, so that the water vapor acts on the surface of the battery electrode to separate the active material and the current collector of the battery electrode.
[0015] In one alternative embodiment, the battery electrode includes a positive electrode or a negative electrode; wherein the positive electrode is treated with water vapor for a period of 10 to 60 minutes, and the negative electrode is treated with water vapor for a period of 1 to 10 minutes.
[0016] In one alternative embodiment, the operating temperature range of the heating device is set to 100 degrees Celsius to 150 degrees Celsius.
[0017] In one alternative embodiment, the battery electrode is placed horizontally or vertically above the heating device.
[0018] In one alternative embodiment, the battery electrode includes waste battery electrode that has not been in contact with the electrolyte, waste battery electrode that has been in contact with the electrolyte, or recycled battery electrode that has been in contact with the electrolyte.
[0019] In one alternative embodiment, before placing the battery electrode inside the housing and fixing it above the heating device using an electrode fixing device, the method further includes:
[0020] If the battery electrode includes waste battery electrode that has been in contact with electrolyte or recycled battery electrode that has been in contact with electrolyte, the battery electrode is dried to remove residual electrolyte from the battery electrode.
[0021] In one optional embodiment, the active material of the positive electrode includes at least one of lithium cobalt oxide, lithium iron phosphate, and ternary materials; the active material of the negative electrode includes graphite.
[0022] As described above, this application provides a battery electrode peeling device and method. The peeling device includes: a housing, a heating device located within the housing, and an electrode fixing device. The heating device is located at the bottom of the housing and is used to heat water to generate steam for peeling the battery electrode. The electrode fixing device is located at the top of the housing and is used to fix the battery electrode above the heating device. During the peeling process, the steam generation rate is controlled by adjusting the operating temperature of the heating device, allowing the steam to act on the surface of the battery electrode to separate the active material and the current collector. In this application embodiment, after the water is heated to a steam state, the binder is thermally softened through heat transfer. Simultaneously, the interfacial stress generated by the steam flow further breaks the bonding force between the binder and the current collector, achieving the peeling of the active material and the current collector. Furthermore, the steam action is uniform and controllable during the peeling process, allowing for precise control of the peeling strength. This avoids direct impact of mechanical force on the active material particles, prevents damage to the active material structure, and improves the integrity of the active material after peeling, meeting the requirements for raw material quality for direct repair. Moreover, using steam as a medium eliminates the need for chemical solvents, reducing pollution and processing costs. Attached Figure Description
[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.
[0024] Figure 1 This is a schematic diagram of the structure of a battery electrode stripping device provided in an embodiment of this application;
[0025] Figure 2 This is a schematic diagram of the structure of an electrode fixing device provided in an embodiment of this application;
[0026] Figure 3 A flowchart illustrating a method for peeling off battery electrodes provided in an embodiment of this application;
[0027] Figure 4 This is a schematic diagram illustrating the peeling effect of a battery electrode as provided in an embodiment of this application.
[0028] The realization of the objectives, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation
[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.
[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Optionally, components, features, or elements with the same name in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which needs to be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.
[0031] It should be understood that although the terms first, second, third, etc., may be used herein to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this document, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if," as used herein, may be interpreted as "when," "when," or "in response to determination." Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to also include the plural forms, unless the context indicates otherwise. It should be further understood that the terms "comprising," "including," indicate the presence of a feature, step, operation, element, component, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, kinds, and / or groups. The terms "or," "and / or," "including at least one of the following," etc., used in this application may be interpreted as inclusive, or mean any one or any combination thereof. For example, "including at least one of the following: A, B, C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C." Similarly, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C." Exceptions to this definition only occur when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.
[0032] It should be understood that although the steps in the flowcharts of this application's embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.
[0033] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”
[0034] It should be noted that step designations such as S100 are used in this document for the purpose of more clearly and concisely describing the corresponding content, and do not constitute a substantial limitation on the order. Those skilled in the art may use these designations in specific implementations, but they should all be within the scope of protection of this application.
[0035] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.
[0036] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.
[0037] With the rapid development of the new energy industry, lithium-ion batteries have become the core energy carrier for electric vehicles, energy storage systems, and consumer electronics. This large-scale application has led to a corresponding increase in the volume of retired batteries. The recycling of retired lithium-ion batteries is of strategic significance in alleviating resource shortages and reducing environmental pollution.
[0038] In related technologies, lithium-ion battery electrodes are composed of current collectors (aluminum or copper foil) and active materials bonded together with an adhesive. The current collectors and active materials are then separated using a chemical stripping method. However, chemical stripping methods suffer from problems such as severe pollution or excessive cost, making it difficult to meet the recycling needs of batteries.
[0039] Therefore, developing an electrode stripping technology that can separate active materials from current collectors while avoiding material damage and environmental pollution has become a pressing technical challenge in the field of battery recycling.
[0040] To address the aforementioned problems, the inventors proposed the following technical concept: a device specifically designed for peeling battery electrodes and a corresponding peeling method. The peeling device mainly comprises a housing, and a heating device and an electrode fixing device disposed within the housing. The heating device, located at the bottom of the housing, heats water to generate high-temperature steam, which is used to perform surface peeling treatment on the battery electrodes. Simultaneously, the electrode fixing device, located at the top of the housing, fixes the battery electrodes to be treated above the heating device to ensure accurate positioning during the peeling process.
[0041] During the stripping process of battery electrodes, the generation rate of water vapor can be controlled by adjusting the operating temperature of the heating device, ensuring that the generated water vapor fully acts on the surface of the battery electrodes. Through the thermal and humid effects and physical impact of the water vapor, the active material and current collector of the battery electrodes can be effectively and uniformly separated. This method uses water as a medium, eliminating the need for chemical solvents, thus reducing pollution and processing costs. Furthermore, the controlled steam action improves the integrity of the stripping process, meeting the quality requirements of the raw materials for remediation.
[0042] Figure 1 This is a schematic diagram of a battery electrode stripping device provided in an embodiment of this application. Figure 1 As shown, the stripping device includes: a housing, a heating device located inside the housing, and an electrode fixing device;
[0043] The heating device is located at the bottom of the housing and is used to heat water to generate water vapor for peeling off the battery electrodes. The electrode fixing device is located at the top of the housing and is used to fix the battery electrodes above the heating device. During the peeling process of the battery electrodes, the water vapor generation rate is controlled by adjusting the working temperature of the heating device, so that the water vapor acts on the surface of the battery electrodes to separate the active material and the current collector of the battery electrodes.
[0044] In this embodiment, the shape, size, and material of the shell are not specifically limited. Optionally, the shell may be cylindrical. The shell material may be metals such as copper, iron, and aluminum, or metal alloys such as aluminum alloys.
[0045] In some embodiments, the housing includes a body and a cover, the cover being provided with a vent or a pressure relief valve; during the process of peeling off the battery electrode, the vent or pressure relief valve is used to balance the pressure inside and outside the housing, so that water vapor acts on the surface of the battery electrode from bottom to top, thereby separating the active material and the current collector of the battery electrode.
[0046] In this embodiment, the size and number of vent holes are not specifically limited. Optionally, the heating device includes a heating element and a water container; wherein the water container is used to hold distilled water; the heating element is used to heat the water container, and the steam generation rate is controlled by adjusting the operating temperature of the heating element. The heating element can be any type of heating element. For example, the heating element can be a resistance heating element or an electromagnetic induction heating element.
[0047] In some embodiments, such as Figure 2 As shown, the electrode fixing device includes a bracket and a clamp; the bracket is connected to the shell cover; one end of the clamp is connected to the bracket, and the other end of the clamp is used to fix the battery electrode above the heating device.
[0048] Optionally, the electrode fixing device can be a suspended support structure. The bracket is a rigid beam structure, horizontally mounted below the housing cover, and is typically made of metal or high-strength engineering plastic. The top of the bracket is fixed to the housing cover by bolts or clips, providing a load-bearing foundation for the entire electrode fixing device.
[0049] Optionally, one end of the clamp is detachably connected to the bracket and can slide along the bracket to adjust the spacing between two adjacent clamps, thereby adapting to battery electrode sheets of different sizes. Optionally, the other end of the clamp is designed with a bayonet or elastic claw structure to clamp the upper edge of the battery electrode sheet, ensuring that the battery electrode sheet is suspended vertically and does not wobble. In this embodiment, the number of clamps is not specifically limited. Optionally, the number of clamps can be 5. Multiple clamps can be evenly arranged along the length of the bracket, with the number matching the number of battery electrode sheets to be fixed.
[0050] This application provides a battery electrode peeling device, comprising: a housing, a heating device located within the housing, and an electrode fixing device. The heating device is located at the bottom of the housing and is used to heat water to generate steam for peeling the battery electrode. The electrode fixing device is located at the top of the housing and is used to fix the battery electrode above the heating device. During the peeling process, the steam generation rate is controlled by adjusting the operating temperature of the heating device, allowing the steam to act on the surface of the battery electrode to separate the active material and the current collector. In this application embodiment, after the water is heated to a steam state, the binder is thermally softened through heat transfer. Simultaneously, the interfacial stress generated by the steam flow further breaks the bonding force between the binder and the current collector, achieving the peeling of the active material from the current collector. Furthermore, the steam action is uniform and controllable during the peeling process, allowing for precise control of the peeling strength. This avoids direct impact of mechanical force on the active material particles, preventing structural damage to the active material and improving the integrity of the active material after peeling, meeting the requirements for raw material quality for direct repair. Moreover, using steam as a medium eliminates the need for chemical solvents, reducing pollution and processing costs.
[0051] Figure 3 This is a flowchart illustrating a method for peeling off battery electrodes according to an embodiment of this application. This method is applied to the aforementioned battery electrode peeling equipment, such as... Figure 3 As shown, the method for peeling off the battery electrode includes the following steps S301 to S303:
[0052] S301. Place the battery electrode inside the housing and fix the battery electrode above the heating device using the electrode fixing device.
[0053] In this embodiment, the placement method and height of the battery electrodes are not specifically limited. Optionally, the battery electrodes can be placed horizontally or vertically above the heating device. For example, as shown... Figure 1 As shown, the battery electrodes are placed vertically above the heating device.
[0054] In some embodiments, battery electrode sheets include waste battery electrode sheets that have not been in contact with the electrolyte, waste battery electrode sheets that have been in contact with the electrolyte, or recycled battery electrode sheets that have been in contact with the electrolyte. Waste battery electrode sheets refer to battery electrode sheets that failed to meet standards during the battery production process. Recycled battery electrode sheets refer to battery electrode sheets from used batteries.
[0055] Optionally, before placing the battery electrode in the housing and fixing it above the heating device by the electrode fixing device, the method further includes: if the battery electrode includes waste battery electrode that has been in contact with the electrolyte or recycled battery electrode that has been in contact with the electrolyte, then drying the battery electrode to remove residual electrolyte on the battery electrode.
[0056] Alternatively, the battery electrodes can be dried using a vacuum drying oven.
[0057] For example, recycled waste lithium-ion batteries are disassembled to obtain recycled battery electrodes that have been in contact with the electrolyte. At this point, the recycled battery electrodes need to be dried to remove any residual electrolyte.
[0058] In some embodiments, the battery electrode sheets can be cut to a preset size for ease of subsequent operations. In this application embodiment, the size of the battery electrode sheets is not specifically limited. Optionally, the preset size is 2cm × 2cm.
[0059] S302. Inject a preset volume of distilled water into the heating device and heat it to generate water vapor for stripping the battery electrodes.
[0060] In this embodiment, the value of the preset volume is not specifically limited. Optionally, the preset volume may be half the volume of the heating device.
[0061] S303. By adjusting the operating temperature of the heating device, the rate of water vapor generation is controlled, so that the water vapor acts on the surface of the battery electrode to separate the active material and the current collector of the battery electrode.
[0062] In this embodiment, the operating temperature range of the heating device is set to 100°C to 150°C. The higher the operating temperature, the faster the water vapor generation rate and the faster the separation speed. It should be noted that the active material adheres to the current collector via a binder. Water vapor, acting as a heat medium, transfers its heat to the binder upon contact with the battery electrode, raising the binder's temperature and causing increased molecular motion and thermal softening. At this time, as the water vapor flows across the electrode surface and within the pores, shear stress and impact stress are generated due to velocity differences, pressure gradients, and turbulence. These stresses act directly on the interface between the softened binder and the current collector, causing microcracks to form at the interface. Continuous water vapor flow further peels away the binder at the crack tips, ultimately causing the active material to detach entirely from the current collector surface.
[0063] In some embodiments, the battery electrode includes a positive electrode or a negative electrode; wherein the positive electrode is treated with water vapor for a period ranging from 10 to 60 minutes, and the negative electrode is treated with water vapor for a period ranging from 1 to 10 minutes. Optionally, the active material of the positive electrode includes at least one of lithium cobalt oxide, lithium iron phosphate, and ternary materials; the active material of the negative electrode includes graphite. The active material on the negative electrode is easier to peel off than the active material on the positive electrode.
[0064] For example, taking a water bath as the heating device, the steam generation rate can be controlled by adjusting the operating temperature of the water bath. For instance, steam can be used to peel off lithium iron phosphate cathode sheets. The peeling effect of lithium iron phosphate cathode sheets is compared and evaluated below by changing the operating temperature and processing time. The results are as follows... Figure 4 As shown. The specific processing steps are as follows: (1) Adjust the working temperature of the water bath to 80℃ and the steam treatment time to 30 minutes. The results showed that the electrode peeling effect was poor. (2) Adjust the working temperature of the water bath to 120℃ and the steam treatment time to 5 minutes. The results showed that the electrode peeling effect was improved compared to 80℃, but some active material (black powder) remained on the surface of the aluminum foil current collector. (3) Adjust the working temperature of the water bath to 120℃ and the steam treatment time to 30 minutes. The results showed that the active material layers on both sides of the electrode were completely peeled off, the aluminum foil surface was smooth and clean, and there was no black powder residue, and the peeling effect was good.
[0065] For example, by changing the operating temperature and processing time, the peeling effect of the negative electrode sheet was compared and evaluated, and the results were as follows: Figure 4 As shown. The specific processing procedure is as follows:
[0066] (1) Adjust the working temperature of the water bath to 80℃ and the steam treatment time to 5 minutes. The treatment results showed that the active material layer at the edge of the negative electrode sheet protruded, while the central area remained firmly attached to the copper foil, resulting in poor electrode sheet peeling effect.
[0067] (2) Adjust the working temperature of the water bath to 120℃ and the steam treatment time to 5 minutes. The treatment results showed that the negative electrode active material was completely separated from the copper foil current collector, and the overall shape of the electrode remained intact without any breakage.
[0068] (3) Adjust the working temperature of the water bath to 120℃ and the steam treatment time to 20 minutes. The results showed that the active material separated from the copper foil, but due to the long treatment time, the steam continued to act on the electrode, resulting in a loose structure of the active material layer, which increased the difficulty of complete peeling.
[0069] This application provides a method for peeling battery electrodes. The method includes: placing the battery electrode in a housing and fixing it above a heating device using an electrode fixing device; injecting a predetermined volume of distilled water into the heating device and heating it to generate steam for peeling the battery electrode; controlling the steam generation rate by adjusting the operating temperature of the heating device, allowing the steam to act on the surface of the battery electrode to separate the active material and the current collector. In this application embodiment, after the water is heated to a steam state, the adhesive softens through heat transfer, and the interfacial stress generated by the steam flow further breaks the bonding force between the adhesive and the current collector, achieving the peeling of the active material and the current collector. Furthermore, the steam action is uniform and controllable during the peeling process, allowing for precise control of the peeling strength, avoiding direct impact of mechanical force on the active material particles, preventing structural damage to the active material, and improving the integrity of the active material after peeling, meeting the requirements for raw material quality for direct repair. Moreover, using steam as a medium eliminates the need for chemical solvents, reducing pollution and processing costs.
[0070] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A battery electrode stripping device, characterized in that, The stripping device includes: a housing, a heating device located inside the housing, and an electrode fixing device; The heating device is located at the bottom of the housing and is used to heat water to generate water vapor for stripping the battery electrodes. The electrode fixing device is located at the top of the housing and is used to fix the battery electrode above the heating device; During the peeling process of the battery electrode, the rate of water vapor generation is controlled by adjusting the operating temperature of the heating device, so that the water vapor acts on the surface of the battery electrode to separate the active material and the current collector of the battery electrode.
2. The stripping device according to claim 1, characterized in that, The housing includes a housing body and a housing cover, and the housing cover is provided with an exhaust port or a pressure relief valve; During the process of peeling off the battery electrode, the vent or pressure relief valve is used to balance the pressure inside and outside the housing, so that water vapor acts on the surface of the battery electrode from bottom to top to separate the active material and the current collector of the battery electrode.
3. The stripping device according to claim 2, characterized in that, The electrode fixing device includes a bracket and a clamp; The bracket is connected to the shell cover; One end of the clamp is connected to the bracket, and the other end of the clamp is used to fix the battery electrode above the heating device.
4. A method for peeling off battery electrodes, characterized in that, The stripping apparatus applied to the battery electrode sheet according to any one of claims 1 to 3, the stripping method comprising: The battery electrode is placed inside the housing and fixed above the heating device by an electrode fixing device; A preset volume of distilled water is injected into the heating device and heated to generate water vapor for stripping the battery electrodes. The rate of water vapor generation is controlled by adjusting the operating temperature of the heating device, so that the water vapor acts on the surface of the battery electrode to separate the active material and the current collector of the battery electrode.
5. The method according to claim 4, characterized in that, The battery electrode includes a positive electrode or a negative electrode; wherein the positive electrode is treated with water vapor for a period of 10 to 60 minutes, and the negative electrode is treated with water vapor for a period of 1 to 10 minutes.
6. The method according to claim 4, characterized in that, The operating temperature range of the heating device is set to 100 degrees Celsius to 150 degrees Celsius.
7. The method according to claim 4, characterized in that, The battery electrodes are placed horizontally or vertically above the heating device.
8. The method according to claim 4, characterized in that, The battery electrode includes waste battery electrode that has not been in contact with the electrolyte, waste battery electrode that has been in contact with the electrolyte, or recycled battery electrode that has been in contact with the electrolyte.
9. The method according to claim 8, characterized in that, Before placing the battery electrode plates inside the housing and fixing them above the heating device using the electrode fixing device, the method further includes: If the battery electrode includes waste battery electrode that has been in contact with electrolyte or recycled battery electrode that has been in contact with electrolyte, the battery electrode is dried to remove residual electrolyte from the battery electrode.
10. The method according to claim 5, characterized in that, The active material of the positive electrode includes at least one of lithium cobalt oxide, lithium iron phosphate, and ternary materials; the active material of the negative electrode includes graphite.