Winding equipment, winding methods, individual cells and devices for battery modules

Abstract

This application relates to the field of energy storage, providing a winding device, winding method, battery cell, and apparatus for battery cell components. The winding device includes: multiple traction roller groups for conveying winding material to a winding mechanism, each traction roller group including multiple traction rollers, at least two of which are equipped with heating devices; a winding mechanism for winding the material to form a core; a hot pressing module for hot pressing and shaping the core; the winding device having a cavity, with the winding mechanism, hot pressing module, and multiple traction roller groups located within the cavity; and an ambient heating module for heating the cavity. The battery cell component winding device provided by this application can at least improve battery cell production efficiency.

Description

Technical Field

[0001] This application relates to the field of energy storage, and in particular to a winding device for a battery cell assembly, a winding method for a battery cell assembly, a battery cell, a battery device, an electrical device, and an energy storage device. Background Technology

[0002] The production of lithium-ion battery cells typically involves multiple independent processes. First, after the cells are wound in a winding machine, they need to be transferred to a preheating furnace for preheating to ensure the material reaches the appropriate temperature. Then, the preheated cells are transferred again to a hot press for hot pressing and shaping. This process of transferring and waiting between multiple independent machines significantly reduces production efficiency. Furthermore, the number and size of the equipment greatly increase the production line's floor space and the costs of equipment procurement and maintenance. Summary of the Invention

[0003] This application provides a winding device for battery cell components, a winding method for battery cell components, a battery cell, a battery device, an electrical device, and an energy storage device, which at least solves the problem of low battery cell production efficiency.

[0004] According to some embodiments of this application, one aspect of this application provides a winding device for a battery cell assembly, comprising: a plurality of traction roller groups for conveying winding material to a winding mechanism, each traction roller group including a plurality of traction rollers, at least two of the traction rollers in each traction roller group being provided with a heating device; a winding mechanism for winding the winding material to form a core; a hot pressing module for hot pressing and shaping the core; the winding device having a cavity, the winding mechanism, the hot pressing module and the plurality of traction roller groups being located within the cavity; and an ambient heating module for heating the cavity.

[0005] In some embodiments, the winding material includes a positive electrode winding material, a negative electrode winding material, and a separator winding material. The plurality of traction roller groups include: a first traction roller group for conveying the positive electrode winding material; a second traction roller group for conveying the negative electrode winding material; and a third traction roller group for conveying the separator winding material. The first traction roller group includes a plurality of traction rollers arranged sequentially along the conveying direction of the positive electrode winding material; the second traction roller group includes a plurality of traction rollers arranged sequentially along the conveying direction of the negative electrode winding material; and the third traction roller group includes a plurality of traction rollers arranged sequentially along the conveying direction of the separator winding material.

[0006] In some embodiments, the operating temperature of each traction roller in the first traction roller group increases along the conveying direction of the positive electrode winding material within a first preset temperature range according to a first preset temperature gradient; the operating temperature of each traction roller in the second traction roller group increases along the conveying direction of the negative electrode winding material within a second preset temperature range according to a second preset temperature gradient; and the operating temperature of each traction roller in the third traction roller group increases along the conveying direction of the diaphragm winding material within a third preset temperature range according to a third preset temperature gradient.

[0007] In some embodiments, the operating temperature of the hot pressing module is greater than or equal to the operating temperature of the traction roller closest to the hot pressing module in each of the traction roller groups.

[0008] In some embodiments, the winding apparatus further includes a conveying device for conveying the core formed by the winding mechanism to the hot pressing module.

[0009] In some embodiments, the outer casing of the winding device and / or the inner wall of the cavity are provided with a heat insulation layer.

[0010] In some embodiments, the winding apparatus further includes: a positive electrode unwinding assembly for providing positive electrode winding material to the traction roller group; a negative electrode unwinding assembly for providing negative electrode winding material to the traction roller group; and a diaphragm unwinding assembly for providing diaphragm winding material to the traction roller group.

[0011] According to some embodiments of this application, another aspect of this application provides a method for winding a battery cell assembly, comprising: controlling an ambient heating module to heat a cavity so that the ambient temperature of the cavity reaches a preset temperature; heating each of the traction rollers according to a preset mapping table of traction rollers and target working temperatures so that the temperature of each of the traction rollers reaches the target working temperature corresponding to each of the traction rollers; using the heated traction roller group to transport the corresponding winding material to a winding mechanism, and using the winding mechanism to wind the winding material to obtain a core, wherein the winding material corresponds one-to-one with the traction roller group; and using a hot pressing module to hot press the core to obtain a shaped core.

[0012] In some embodiments, the preset temperature is 50°C-70°C.

[0013] In some embodiments, the traction roller group includes a first traction roller group for conveying positive electrode winding material, wherein the target operating temperature of the traction roller in the first traction roller group that is farthest from the hot pressing module is 65°C-75°C, and the target operating temperature of the traction roller in the first traction roller group that is closest to the hot pressing module is 90°C-100°C.

[0014] In some embodiments, the traction roller group includes a second traction roller group for conveying negative electrode winding material, wherein the target operating temperature of the traction roller in the second traction roller group that is farthest from the hot pressing module is 65°C-75°C, and the target operating temperature of the traction roller in the second traction roller group that is closest to the hot pressing module is 90°C-100°C.

[0015] In some embodiments, the traction roller group includes a third traction roller group for conveying diaphragm winding material, wherein the target operating temperature of the traction roller in the third traction roller group that is farthest from the hot pressing module is 65°C-75°C, and the target operating temperature of the traction roller in the third traction roller group that is closest to the hot pressing module is 90°C-95°C.

[0016] According to some embodiments of this application, another aspect of this application provides a battery cell, the battery cell including a cell assembly, the cell assembly being prepared by any of the cell assembly winding equipment or any of the cell assembly winding methods, the cell assembly including a positive electrode, a negative electrode and a separator.

[0017] According to some embodiments of this application, another aspect of this application provides a battery device, the battery device including the aforementioned battery cell, and the battery device including one or more of a battery module, a battery pack, and an energy storage battery.

[0018] According to some embodiments of this application, this application also provides an electrical device, the electrical device including the aforementioned battery device, the battery device being used to provide electrical energy.

[0019] According to some embodiments of this application, another aspect of this application provides an energy storage device, the energy storage device including the aforementioned battery device, the battery device being used to store electrical energy.

[0020] The technical solution provided in this application has at least the following advantages: By integrating a winding mechanism, a hot pressing module, an ambient heating module, and multiple traction roller groups within the same cavity, winding, preheating, and hot pressing are continuously completed within a single set of equipment, eliminating the need to transfer the core between the winding equipment, preheating furnace, and hot press. The traction roller groups are heated simultaneously while conveying the winding material, ensuring the material reaches a suitable temperature before entering the winding mechanism; the ambient heating module provides a stable and constant temperature environment; and the hot pressing module, located within the cavity, allows for direct hot pressing after winding. This reduces intermediate handling, shortens production cycle time, lowers energy consumption, and improves the temperature consistency and forming quality of the core from winding to hot pressing, effectively solving the problem of low cell production efficiency in the prior art. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the drawings in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this application or in the conventional art, the drawings used in 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.

[0022] Figure 1 This is a schematic diagram of a single-station integrated winding hot pressing system according to an embodiment of this application;

[0023] Figure 2 This application provides a method for winding a battery cell assembly according to an embodiment of the present application.

[0024] Figure 3 This application provides a system for multiple winding heads operating in parallel, according to an embodiment of the present application.

[0025] Figure 4 This application provides a variable parameter system suitable for large-size or irregularly shaped battery cells, according to an embodiment of the present application. Detailed Implementation

[0026] As is known from the background art, in the prior art, the production of lithium battery cells requires transferring from the winding equipment to the preheating furnace for preheating, and then to the hot press for hot pressing and shaping, resulting in low cell production efficiency. In order to solve the above technical problems, the embodiments of this application provide a winding equipment for battery cell components, a winding method for battery cell components, a battery cell, a battery device, an electrical device, and an energy storage device.

[0027] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0028] 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.

[0029] 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 three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0030] 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).

[0031] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0033] In the accompanying drawings corresponding to the embodiments of this application, the thickness and area of ​​the layers are enlarged for better understanding and ease of description. When describing a component (such as a layer, film, region, or substrate) on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be a third component between the two components. Conversely, when describing a component on the surface of another component, or when another component is formed or disposed on the surface of a component, it indicates that there is no third component between the two components. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a portion of the edge of the entire surface.

[0034] In the description of the embodiments of this application, when a component "includes" another component, other components are not excluded unless otherwise stated, and other components may be further included. Furthermore, when a component such as a layer, film, region, or plate is referred to as being "on / located" on another component, it can be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may be present therein. Moreover, when a component such as a layer, film, region, or plate is "directly located" on another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it indicates that no other components are located therein.

[0035] The terminology used in the description of the various embodiments described herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "foreword" is also intended to include the plural form unless the context clearly indicates otherwise. Components include layers, films, regions, or plates, etc.

[0036] The embodiments of this application will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0037] This embodiment provides a winding device for a battery cell assembly, comprising:

[0038] Multiple traction roller groups are used to transport the winding material to the winding mechanism. Each traction roller group includes multiple traction rollers, and at least two of the traction rollers in each traction roller group are provided with heating devices.

[0039] Specifically, each traction roller group is set on the conveying path of the wound material to apply traction force and guide constraint to the wound material.

[0040] The aforementioned winding mechanism is used to wind the aforementioned winding material to form a core;

[0041] Specifically, the winding mechanism is located downstream of the winding material conveying path, and is used to receive the winding material conveyed by the traction roller group and wind the winding material into a core according to a predetermined winding trajectory.

[0042] The hot pressing module is used to hot press and shape the aforementioned core.

[0043] Specifically, the hot pressing module is located near the working area of ​​the winding mechanism and is used to apply heat and pressure to the core after it is formed to perform hot pressing and shaping treatment on the core. The hot pressing module includes hot pressing components arranged opposite each other and a pressurizing mechanism for driving the hot pressing components closer to or away from the core.

[0044] The winding equipment described above has a cavity, and the winding mechanism, the hot pressing module, and the plurality of traction roller groups are located within the cavity;

[0045] An ambient heating module is used to heat the aforementioned cavity.

[0046] Specifically, the ambient heating module includes a heating element for heating the gas inside the cavity and a temperature detection component for detecting the temperature inside the cavity. The heating element can be turned on or off or its power adjusted by the control system, so that the inside of the cavity is maintained within a temperature range suitable for the winding and hot pressing processes.

[0047] In the above embodiments, by integrating a winding mechanism, a hot pressing module, an ambient heating module, and multiple traction roller groups within the same cavity, winding, preheating, and hot pressing are continuously completed within a single set of equipment, eliminating the need to transfer the core between the winding equipment, preheating furnace, and hot press. The traction roller groups are heated simultaneously while conveying the winding material, ensuring the material reaches a suitable temperature before entering the winding mechanism; the ambient heating module provides a stable, constant temperature environment; and the hot pressing module, located within the cavity, allows for direct hot pressing after winding. This reduces intermediate handling, shortens production cycle time, lowers energy consumption, and improves the temperature consistency and forming quality of the core from winding to hot pressing, effectively solving the problem of low cell production efficiency in existing technologies.

[0048] Furthermore, integrating winding equipment, preheating furnaces, and hot presses into a single unit can significantly reduce the number of devices, lower equipment procurement costs (by approximately 30%), save production line space, and improve factory space utilization. Process integration also simplifies operations, reduces the number of operational positions, and facilitates fully automated and intelligent operation, thereby reducing labor costs and improving the overall automation level of the production line.

[0049] In one alternative embodiment, the winding material includes a positive electrode winding material, a negative electrode winding material, and a diaphragm winding material. The plurality of traction roller sets include: a first traction roller set for conveying the positive electrode winding material; a second traction roller set for conveying the negative electrode winding material; and a third traction roller set for conveying the diaphragm winding material. The first traction roller set includes a plurality of traction rollers arranged sequentially along the conveying direction of the positive electrode winding material; the second traction roller set includes a plurality of traction rollers arranged sequentially along the conveying direction of the negative electrode winding material; and the third traction roller set includes a plurality of traction rollers arranged sequentially along the conveying direction of the diaphragm winding material.

[0050] In the above embodiments, by separating the winding materials into positive electrode winding materials, negative electrode winding materials, and diaphragm winding materials, and conveying them separately by corresponding traction roller groups, mutual interference is avoided and conveying stability is improved. Each traction roller group is equipped with multiple traction rollers along the material conveying direction, so that the material undergoes multi-stage guidance and traction during the conveying process, which helps to maintain the tension and positional stability of the material and reduce problems such as deviation and wrinkling.

[0051] Specifically, the first traction roller group includes multiple traction rollers arranged sequentially along the conveying direction of the positive electrode winding material. Each traction roller guides and pulls the positive electrode winding material sequentially, causing it to be fed to the winding mechanism along a predetermined path. Similarly, the second traction roller group includes multiple traction rollers arranged sequentially along the conveying direction of the negative electrode winding material, used for segmented traction of the negative electrode winding material; the third traction roller group includes multiple traction rollers arranged sequentially along the conveying direction of the diaphragm winding material, used for guiding and conveying the diaphragm winding material.

[0052] It should be noted that multiple traction roller groups are not limited to the three groups mentioned above. In other embodiments, a fourth traction roller group, a fifth traction roller group, etc., can be added according to the cell structure and process requirements to transport additional functional layer materials or other types of winding materials, or to perform multi-stage traction and correction on the same winding material. The number of traction roller groups and the corresponding winding material types can be adjusted according to specific application scenarios. This application does not limit the specific number and combination of traction roller groups.

[0053] In another alternative, the operating temperature of each traction roller in the first traction roller group increases along the conveying direction of the positive electrode winding material within a first preset temperature range according to a first preset temperature gradient; the operating temperature of each traction roller in the second traction roller group increases along the conveying direction of the negative electrode winding material within a second preset temperature range according to a second preset temperature gradient; and the operating temperature of each traction roller in the third traction roller group increases along the conveying direction of the diaphragm winding material within a third preset temperature range according to a third preset temperature gradient.

[0054] In the above embodiments, under gradient heating mode, each traction roller is heated progressively along the conveying direction of the winding material, allowing the material to undergo a controllable temperature change from low to high during conveying, ensuring that it reaches a suitable preheated state before reaching the winding position. This segmented heating method avoids thermal shock caused by a sudden, one-time temperature increase, reduces the risk of material deformation and performance degradation, and essentially completes the preheating process that originally required an independent preheating furnace during the traction stage. This allows the core to directly enter the hot-pressing and shaping stage within the same equipment, thereby reducing equipment switching and transfer, and improving production cycle time and temperature consistency. Simultaneously, the gradient setting ensures that the temperature history experienced by the material in each segment remains accurate, continuous, and repeatable, resulting in better overall thermal consistency and improving core thickness uniformity and interlayer bonding quality. Stable temperature distribution and reduced local hot and cold spots can be expected to reduce the probability of thermally related defects such as black spots and lithium plating, thereby improving cell yield and consistency.

[0055] In some exemplary embodiments, the operating temperature of the hot pressing module is greater than or equal to the operating temperature of the traction roller closest to the hot pressing module in each of the traction roller groups.

[0056] In the above embodiments, by setting the working temperature of the hot pressing module to be no lower than the working temperature of the traction roller closest to the hot pressing module in each traction roller group, the core can maintain continuous temperature conditions during the process of entering the hot pressing station from the winding area, avoiding midway cooling or reheating, which is beneficial to improving the thermal consistency of the core, improving the interlayer bonding quality, and reducing hot pressing defects.

[0057] In some other exemplary embodiments, the winding apparatus further includes a conveying device for conveying the winding core formed by the winding mechanism to the hot pressing module.

[0058] In the above embodiments, by setting up a conveying device, the core formed by the winding mechanism is directly transported to the hot pressing module, allowing the core to continuously flow inside the cavity after winding without needing additional preheating equipment or intermediate heating modules before entering the hot pressing process. Compared with the prior art where the core needs to be transferred to an independent preheating furnace for reheating after winding, this equipment can maintain the core at a stable process temperature jointly established by the traction roller group and the cavity environment during the conveying process, thereby avoiding cooling or temperature fluctuations of the core during the transfer. This not only eliminates the intermediate heating step and improves the overall production cycle time, but also enhances the temperature consistency of the core when it enters the hot pressing stage, which is beneficial to improving the hot pressing forming quality and process stability.

[0059] In some exemplary embodiments, a heat insulation layer is provided on the outer shell of the winding device and / or the inner wall of the cavity.

[0060] In the above embodiments, the insulation layer reduces heat dissipation between the cavity and the external environment, making the internal temperature of the cavity more stable and reducing energy loss. The insulation layer helps maintain the constant temperature environment required for the winding, preheating, and hot-pressing processes, preventing temperature fluctuations from affecting the material's condition, thereby improving process continuity and molding quality, and increasing overall production efficiency.

[0061] In some exemplary embodiments of this application, the winding apparatus further includes: a positive electrode unwinding assembly for providing positive electrode winding material to the traction roller group; a negative electrode unwinding assembly for providing negative electrode winding material to the traction roller group; and a diaphragm unwinding assembly for providing diaphragm winding material to the traction roller group.

[0062] In the above embodiments, by integrating the positive electrode unwinding assembly, the negative electrode unwinding assembly, and the diaphragm unwinding assembly into the winding equipment, various winding materials can complete the continuous processing of unwinding, traction, and winding within the same equipment without relying on external material supply equipment. This reduces the transfer and docking links of materials between different equipment, and allows the material supply, conveying, and winding processes to be completed in the same station, which is conducive to improving the overall automation level of the equipment and the efficiency of process connection. At the same time, it avoids the alignment deviation and unstable material supply problems caused by external unwinding mechanisms, thereby further improving the continuity and consistency of the core forming process and supporting the whole machine to achieve a higher production cycle.

[0063] An embodiment of this application provides a schematic diagram of a single-station integrated winding hot pressing system, as shown below. Figure 1 As shown, the winding and hot-pressing system includes a positive electrode unwinding assembly, a diaphragm unwinding assembly, a negative electrode unwinding assembly, a positive electrode traction roller group, a diaphragm traction roller group, a negative electrode traction roller group, a winding head, and an integrated hot-pressing plate. The system is housed within a sealed equipment cavity and maintained at a constant temperature of 60°C by an ambient heating module. The positive and negative electrode sheets and the diaphragm pass through heated traction rollers with temperature gradients along their respective paths, converging at the winding head for shaping. After winding, the hot-pressing plate integrated below the winding head immediately hot-presses the battery cell.

[0064] Embodiments of this application also provide a method for winding a battery cell assembly, such as... Figure 2 As shown, it includes:

[0065] Step S101: Control the ambient heating module to heat the cavity so that the ambient temperature of the cavity reaches the preset temperature.

[0066] Specifically, the winding equipment is started, and the ambient heating module is controlled to heat the cavity.

[0067] Step S102: According to the preset mapping relationship table between traction rollers and target working temperature, each of the above-mentioned traction rollers is heated so that the temperature of each of the above-mentioned traction rollers reaches the target working temperature corresponding to each of the above-mentioned traction rollers.

[0068] Specifically, target operating temperatures are pre-set for traction rollers at different positions or with different functions, and a mapping table between traction rollers and target operating temperatures is established. During execution, heating control is applied to each traction roller according to this mapping table, ensuring that the actual temperature of the corresponding traction roller reaches its respective target operating temperature. The aforementioned mapping table between traction rollers and target operating temperatures is pre-set according to process requirements. The target operating temperature is determined based on factors such as the type, thickness, and thermal performance parameters (e.g., heat resistance temperature, heat shrinkage characteristics) of the winding material, the winding linear speed, and the desired material temperature at the winding position. For traction rollers located at different positions along the winding material conveying path, target operating temperatures are set separately based on their distance from the winding mechanism to achieve segmented preheating, thus forming a temperature setting that gradually increases in temperature along the conveying direction.

[0069] Step S103: The corresponding winding material is conveyed to the winding mechanism using the heated traction roller group, and the winding mechanism is used to wind the winding material to obtain the core. The winding material corresponds one-to-one with the traction roller group.

[0070] Specifically, after the traction rollers are heated to the target operating temperature, the heated traction roller group is used to traction and transport the corresponding winding material, so that various winding materials are stably fed into the winding mechanism along a predetermined path.

[0071] Step S104: The above-mentioned core is hot-pressed using a hot-pressing module to obtain a shaped core.

[0072] In the above embodiments, heating the cavity maintains the winding environment within a suitable temperature range. Processing the winding material under an overall constant temperature environment avoids sudden temperature rises and falls caused by transferring the winding material between different devices, thus reducing thermal shock. Heating each traction roller separately according to a mapping relationship allows the winding material to achieve a gradual heating effect along the conveying path, preventing stress concentration, warping, or coating peeling caused by localized sudden heating. This also makes the heating process more uniform, reducing thermal stress caused by temperature differences between the inside and outside of the material. Under the combined effect of traction roller preheating and cavity environment heating, the winding material gradually releases internal stress upon contact with the traction rollers, ensuring that the polymer diaphragm, the binder in the electrode coating, and the active material layer are in a more stable and compliant temperature state before winding. These conditions help improve the fit during winding, reduce interlayer gaps, and improve the core interface quality. Finally, the wound core can be directly hot-pressed and shaped within the same cavity without needing to be transferred to an independent preheating furnace and hot press, significantly shortening the production cycle and improving process continuity and cell forming quality.

[0073] In some exemplary embodiments, the preset temperature is 50°C-70°C.

[0074] In the above embodiments, by setting the preset temperature of the cavity to an ambient temperature of 50℃–70℃, effective preheating of the winding material is provided, while preventing premature shrinkage of the diaphragm or excessive softening of the adhesive. This maintains the mechanical strength and processing stability of the material, further ensuring the consistency of the core winding and hot pressing processes. Under this basic temperature field, the energy required for the traction roller to rise from the ambient temperature to a higher target temperature is significantly reduced. Simultaneously, precise heating is applied only to the critical traction roller and its localized areas, allowing heat to be directly transferred to the moving winding material, reducing ineffective heating and improving thermal efficiency. As a result, the overall energy consumption of the machine can be reduced by approximately 20%–30%.

[0075] In some other exemplary embodiments, the traction roller group includes a first traction roller group for conveying positive electrode winding material, wherein the target operating temperature of the traction roller in the first traction roller group that is farthest from the hot pressing module is 65°C-75°C, and the target operating temperature of the traction roller in the first traction roller group that is closest to the hot pressing module is 90°C-100°C.

[0076] In the above embodiments, by setting a target operating temperature for the first traction roller group used to transport the positive electrode winding material, a stable, gradually increasing temperature gradient is formed in the material during transport. This allows the material to receive gentle preheating in the initial stage, avoiding thermal shock caused by sudden temperature increases, while simultaneously reaching a temperature close to that required for the hot pressing process at the end. This allows the core to directly enter the hot pressing module after winding without the need for additional preheating equipment. This not only improves the temperature continuity and material adaptability between winding and hot pressing but also reduces heat loss, improving core forming quality and production cycle time.

[0077] In one alternative embodiment, the aforementioned traction roller group includes a second traction roller group for conveying negative electrode winding material. The target operating temperature of the traction roller in the second traction roller group that is furthest from the hot pressing module is 65°C-75°C, and the target operating temperature of the traction roller in the second traction roller group that is closest to the hot pressing module is 90°C-100°C.

[0078] In the above embodiments, by setting a target operating temperature for the second traction roller group used to transport the negative electrode winding material, a stable and progressively increasing heating process is achieved for the negative electrode winding material during transport. The material is gently preheated at the beginning of transport to avoid stress concentration caused by rapid temperature rise, and then heated to near the process temperature required for hot pressing at the end. This allows the core to directly enter the hot pressing module for shaping after winding. This improves the thermal adaptability and interlayer bonding quality of the negative electrode material, further enhances the overall consistency of the core forming, and reduces temperature loss and production cycle delay between winding and hot pressing.

[0079] In another alternative embodiment, the aforementioned traction roller group includes a third traction roller group for conveying the diaphragm winding material. The target operating temperature of the traction roller in the third traction roller group that is furthest from the hot pressing module is 65°C-75°C, and the target operating temperature of the traction roller in the third traction roller group that is closest to the hot pressing module is 90°C-95°C.

[0080] In the above embodiments, by setting a target operating temperature for the third traction roller group used to transport the diaphragm winding material, a progressive and gentle heating process can be achieved for the diaphragm during transport. This temperature gradient effectively improves the diaphragm's flexibility, reduces defects caused by wrinkles or uneven tension, and prevents excessive shrinkage or thermal damage to the diaphragm at high temperatures. When the diaphragm reaches a stable temperature close to that required for the hot-pressing process at the end, it can enter the hot-pressing module simultaneously with the positive and negative electrode materials, maintaining the overall temperature consistency of the core, thereby improving the interlayer bonding quality and increasing the stability and yield of core forming.

[0081] By setting different target operating temperatures and temperature gradients based on the thermal characteristics of the positive electrode winding material, negative electrode winding material, and separator winding material, the heating method of each material during transportation is made more suitable to its own thermal sensitivity, thickness, and mechanical performance requirements. The positive and negative electrode materials can have their coating softening adaptability improved through higher end temperatures, while the separator uses a milder temperature range to avoid thermal shrinkage or damage. This differentiated temperature control method ensures that different materials reach their respective optimal processing temperatures before winding, improving interlayer bonding uniformity, reducing winding defects, enhancing the overall core forming quality, and further improving the consistency and yield of battery cell production.

[0082] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the winding method of this application will be described in detail below with reference to specific embodiments.

[0083] This embodiment designs a specific winding method for a battery cell assembly, including:

[0084] Step S1: Environment setup;

[0085] Start the equipment and use the ambient heating module to heat and stabilize the internal temperature of the winding equipment at 58°C to 62°C.

[0086] Step S2: Material delivery and gradient heating:

[0087] The positive electrode sheet passes through traction rollers at temperatures of 70℃, 80℃, 85℃...100℃ in sequence; the diaphragm passes through traction rollers at temperatures of 70℃, 80℃, and 90℃ in sequence; and the negative electrode sheet passes through traction rollers at temperatures of 70℃, 85℃, and 100℃ in sequence.

[0088] S3: Hot winding;

[0089] The preheated electrode and diaphragm are wound on a winding head at 60°C. During the winding process, the material is continuously subjected to heat from the environment and accumulated internally.

[0090] S4: Instant hot pressing;

[0091] Once the winding is complete, the winding head stops rotating. The integrated hot press plate (with the upper and lower plate temperatures set to 100℃) immediately closes the mold, applies a certain pressure (e.g., 2MPa) to the battery cell, and holds the pressure for a certain time (e.g., 10 seconds).

[0092] S5: Discharge;

[0093] Once the hot pressing is complete, the hot pressing plate is released, and the shaped battery cell is removed.

[0094] Embodiments of this application also provide a system with multiple winding heads operating in parallel, such as... Figure 3As shown, the system includes: a shared constant-temperature environment chamber, multiple parallel winding and hot-pressing units, a central control system, and a robotic handling system. The shared constant-temperature environment chamber is a large, sealed chamber whose internal temperature is maintained at a constant 60±2℃. Distributed heating elements and high-precision temperature sensors are installed inside the chamber for real-time monitoring and control of the temperature at different locations within the chamber. The chamber walls are designed with an insulation layer to reduce heat loss and improve the overall energy efficiency of the system. Multiple parallel winding and hot-pressing units are located within the shared constant-temperature environment chamber. Each unit constitutes an independent winding and hot-pressing station, and each unit is electrically and mechanically independent to avoid mutual interference during operation. Each winding and hot pressing unit includes three complete winding material supply paths: a positive electrode unwinding path with gradient heating rollers at temperatures ranging from 70℃ to 85℃ to 100℃; a diaphragm unwinding path with gradient heating rollers at temperatures ranging from 70℃ to 80℃; and a negative electrode unwinding path with gradient heating rollers at temperatures ranging from 70℃ to 85℃ to 100℃. Each winding and hot pressing unit is equipped with an independent winding head and an independent hot pressing station, allowing for winding, preheating, and hot pressing shaping processes to be performed separately according to production needs. A central control system is used for centralized management of the parallel processes of multiple units. Specifically: a temperature control system provides unified temperature control for the shared constant temperature chamber and monitors the temperature of each zone in real time to ensure uniform temperature distribution within the chamber; a motion control module coordinates the winding speed, material tension, and hot pressing cycle of each winding unit; and a process parameter management module stores process formulas for different products and calls them up as needed to achieve rapid switching between multiple product specifications. The system further includes a robotic handling system, which employs a six-axis industrial robot equipped with flexible grippers to automatically retrieve and handle cores from each hot-pressing station according to the production cycle. The robot system also features a vision recognition module for core posture recognition and precise positioning, improving the reliability and automation of the handling process. The multi-winding hot-pressing units operate in parallel, with each unit running asynchronously. For example, while the first unit performs the hot-pressing process, the second unit can simultaneously perform winding, and the third unit can load the cores. The robot system dynamically schedules the picking sequence according to a set priority, ensuring continuous and efficient overall production. With a unit cycle of approximately 45 seconds per core, the theoretical production capacity of this system, configured with three parallel units, can reach approximately 240 cores per hour, representing a 200% increase in system capacity compared to a single-station structure. This embodiment, while retaining the core advantages of the aforementioned integrated winding hot-pressing technology, achieves a large-scale, multi-station parallel high-cycle production mode. By sharing a constant-temperature environment chamber and a parallel winding hot-pressing architecture, the cost and footprint of deploying multiple devices can be significantly reduced, while improving the automation, integration, and large-scale manufacturing capabilities of the production line.

[0095] Embodiments of this application further provide a variable parameter system suitable for large-size or irregularly shaped battery cells, such as... Figure 4 As shown, the central controller in the system pre-stores various process formulas for different cell sizes and structural forms. Before production, the operator selects the target cell specification via the interface, and the system automatically sets the temperature gradient of the traction roller, the hot-pressing pressure, and the hot-pressing time according to the selected formula, thus enabling the system to adapt to the processing requirements of cells of different shapes. Specifically, for large-size square cells: For large-size square cells, due to their larger electrode length, there are challenges in heat loss and uneven overall core temperature during conveying and winding. To solve these problems, this embodiment uses a steeper temperature gradient, for example, setting the traction roller temperature sequentially from 65°C to 90°C to 105°C to compensate for the heat attenuation caused by the increased length of the material during conveying. To ensure the core forming effect, the final hot-pressing temperature of the hot-pressing unit is simultaneously increased to approximately 105°C, and the hot-pressing pressure and time are correspondingly increased, for example, using a hot-pressing pressure of approximately 2.5 MPa and a hot-pressing duration of approximately 15 seconds, to ensure that large-size cells have sufficient heat and pressure to achieve overall forming during the hot-pressing shaping stage. Implementation for irregularly shaped (e.g., long, thin blade) battery cells: For irregularly shaped cells, such as long, thin blade batteries, the electrode thickness is thinner and the structure is more prone to deformation. Therefore, a gentler and more uniform heating method is needed during winding and preheating to avoid stress concentration and material curling caused by sudden local temperature changes. To address these characteristics, this embodiment uses a relatively gentle temperature gradient, such as a 75°C to 95°C to 95°C mode, reaching the final temperature early and maintaining a constant temperature in the later stages. This setting ensures that the material remains at a stable temperature over a longer period, which helps reduce stress accumulation in the thin areas of the electrode. During the hot-pressing stage, to avoid crushing or structural deformation of the cell, this embodiment uses a lower hot-pressing pressure, such as approximately 1.8 MPa, and sets an appropriate holding time, such as approximately 12 seconds, to achieve shape control of the thin structure through "shape-preserving pressurization."

[0096] The embodiments of this application also provide a battery cell, which includes a cell assembly. The cell assembly is prepared by any of the above-mentioned cell assembly winding equipment or by any of the above-mentioned cell assembly winding methods. The cell assembly includes a positive electrode, a negative electrode, and a separator.

[0097] In the above embodiments, by using the winding equipment or method described in this application to prepare the battery cell assembly, the winding, preheating, and hot-pressing of the battery cell can be completed continuously in the same equipment, and the core is always in a controlled temperature environment during the processing. Therefore, the prepared battery cell has better core compactness, interlayer adhesion, and molding consistency, reducing quality deviations caused by handling and temperature fluctuations in traditional multi-equipment processes, thereby improving the overall structural stability and production consistency of the battery cell.

[0098] An embodiment of this application further provides a battery device, which includes the aforementioned battery cell and includes one or more of a battery module, a battery pack, and an energy storage battery.

[0099] In the above embodiments, by applying the aforementioned battery cells to battery devices, battery modules, battery packs, or energy storage batteries can utilize battery cells that have undergone continuous processing—winding, preheating, and hot pressing—within the same equipment. These cells offer greater reliability in terms of interlayer bonding, compactness, and molding consistency, thereby improving the battery device's cycle life, consistency, thermal stability, and reliability, further enhancing the overall performance and operational stability of the battery module, battery pack, or energy storage battery.

[0100] An embodiment of this application provides an electrical device, which includes the aforementioned battery device, and the battery device is used to provide electrical energy.

[0101] In the above embodiments, by applying the battery device to an electrical device, the electrical device can utilize the battery device composed of the aforementioned battery cells to provide electrical energy. Because the battery device employs an integrated wound hot-pressed battery cell with higher molding quality and tighter interlayer bonding, the electrical device can obtain a more stable power output during operation, thereby improving its operational reliability and service life.

[0102] An embodiment of this application also provides an energy storage device, which includes the aforementioned battery device for storing electrical energy.

[0103] In the above embodiments, by applying the battery device to the energy storage device, the energy storage device can use battery cells composed of the wound and hot-pressed cells of this solution for energy storage. Since the winding, preheating and hot-pressing processes of the cells are all completed continuously in the same equipment, the molding consistency is high and the interlayer bonding is tighter. Therefore, the energy storage device is improved in terms of charge-discharge cycle stability, capacity retention rate and overall reliability, which is beneficial to improving the service life and safety of the energy storage system.

[0104] Those skilled in the art will understand that the above embodiments are specific examples of implementing this application, and in practical applications, various changes in form and detail can be made without departing from the spirit and scope of this application. Any person skilled in the art can make various alterations and modifications without departing from the spirit and scope of this application; therefore, the scope of protection of this application should be determined by the scope defined in the claims.

Claims

1. A winding device for a battery cell assembly, characterized in that, include: Multiple traction roller groups are used to transport the winding material to the winding mechanism. Each traction roller group includes multiple traction rollers, and at least two of the traction rollers in each traction roller group are provided with a heating device. The winding mechanism is used to wind the winding material to form a core; A hot-pressing module is used to hot-press and shape the core. The winding equipment has a cavity, and the winding mechanism, the hot pressing module, and the plurality of traction roller groups are located inside the cavity; An ambient heating module is used to heat the cavity.

2. The winding equipment for the battery cell assembly according to claim 1, characterized in that, The winding material includes positive electrode winding material, negative electrode winding material, and diaphragm winding material, and the multiple traction roller groups include: The first traction roller group is used to convey the positive electrode winding material; The second traction roller group is used to convey the negative electrode winding material; The third traction roller group is used to convey the diaphragm winding material; The first traction roller group includes a plurality of traction rollers arranged sequentially along the conveying direction of the positive electrode winding material; The second traction roller group includes a plurality of traction rollers arranged sequentially along the conveying direction of the negative electrode winding material; The third traction roller group includes a plurality of traction rollers arranged sequentially along the conveying direction of the diaphragm winding material.

3. The winding equipment for the battery cell assembly according to claim 2, characterized in that, The operating temperature of each traction roller in the first traction roller group increases along the conveying direction of the positive electrode winding material within a first preset temperature range and according to a first preset temperature gradient. The operating temperature of each traction roller in the second traction roller group increases along the conveying direction of the negative electrode winding material within a second preset temperature range and according to a second preset temperature gradient. The operating temperature of each traction roller in the third traction roller group increases along the conveying direction of the diaphragm winding material within a third preset temperature range and according to a third preset temperature gradient.

4. The winding equipment for the battery cell assembly according to claim 3, characterized in that, The operating temperature of the hot pressing module is greater than or equal to the operating temperature of the traction roller closest to the hot pressing module in each of the traction roller groups.

5. The winding equipment for the battery cell assembly according to claim 1, characterized in that, The winding equipment also includes: A conveying device is used to convey the core formed by the winding mechanism to the hot pressing module.

6. The winding equipment for the battery cell assembly according to claim 1, characterized in that, The outer shell of the winding equipment and / or the inner wall of the cavity are provided with a heat insulation layer.

7. The winding equipment for the battery cell assembly according to claim 1, characterized in that, The winding equipment also includes: A positive electrode unwinding assembly is used to supply positive electrode winding material to the traction roller group; A negative electrode unwinding assembly is used to provide negative electrode winding material to the traction roller group; A diaphragm unwinding assembly is used to supply diaphragm winding material to the traction roller group.

8. A method for winding a battery cell assembly, applied to the winding apparatus for the battery cell assembly according to any one of claims 1 to 7, characterized in that, The winding method includes: The ambient heating module is controlled to heat the cavity so that the ambient temperature of the cavity reaches the preset temperature. According to the preset mapping table between traction rollers and target working temperatures, each traction roller is heated so that the temperature of each traction roller reaches the target working temperature corresponding to each traction roller. The corresponding winding material is conveyed to the winding mechanism by a heated traction roller group, and the winding mechanism is used to wind the winding material to obtain a core. The winding material corresponds one-to-one with the traction roller group. The core is hot-pressed using a hot-pressing module to obtain a shaped core.

9. The method for winding a battery cell assembly according to claim 8, characterized in that, The preset temperature is 50℃-70℃.

10. The method for winding a battery cell assembly according to claim 8, characterized in that, The traction roller group includes a first traction roller group for conveying positive electrode winding material. The target operating temperature of the traction roller in the first traction roller group that is farthest from the hot pressing module is 65℃-75℃, and the target operating temperature of the traction roller in the first traction roller group that is closest to the hot pressing module is 90℃-100℃.

11. The method for winding a battery cell assembly according to claim 8, characterized in that, The traction roller group includes a second traction roller group for conveying negative electrode winding material. The target operating temperature of the traction roller in the second traction roller group that is farthest from the hot pressing module is 65℃-75℃, and the target operating temperature of the traction roller in the second traction roller group that is closest to the hot pressing module is 90℃-100℃.

12. The method for winding a battery cell assembly according to claim 8, characterized in that, The traction roller group includes a third traction roller group for conveying the diaphragm winding material. The target operating temperature of the traction roller in the third traction roller group that is farthest from the hot pressing module is 65℃-75℃, and the target operating temperature of the traction roller in the third traction roller group that is closest to the hot pressing module is 90℃-95℃.

13. A single battery cell, characterized in that, The battery cell includes a cell assembly, which is prepared by a winding device for a cell assembly as described in any one of claims 1 to 7, or by a winding method for a cell assembly as described in any one of claims 8 to 12, and the cell assembly includes a positive electrode, a negative electrode, and a separator.

14. A battery device, characterized in that, The battery device includes the battery cell as described in claim 13, and the battery device includes one or more of the following: battery module, battery pack, and energy storage battery.

15. An electrical appliance, characterized in that, The electrical device includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

16. An energy storage device, characterized in that, The energy storage device includes the battery device as described in claim 14, the battery device being used to store electrical energy.

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