Manufacturing device and method for electrode assembly

Abstract

The present application provides a manufacturing device and method for an electrode assembly. The manufacturing device for an electrode assembly comprises a winding pin and a heating component, wherein the winding pin is used for winding an electrode sheet and a separator to form a winding structure, and the heating component is configured to be inserted into the winding center of the winding structure and heat the winding structure. By means of the manufacturing device, the heating component can heat the winding structure at the winding center of the winding structure, such that at least some of ion channels in the separator in the inner ring of the winding structure are melt and close, thereby blocking ion shuttling, facilitating reduction of lithium deposition in the winding structure, and effectively lowering the risk of lithium deposition in a battery.

Description

Electrode assembly manufacturing equipment and method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311413172.7, filed on October 27, 2023, entitled “Equipment and method for manufacturing electrode assemblies,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a manufacturing device and method for an electrode assembly. Background Art

[0004] Lithium-ion batteries have the advantages of high specific energy and high power density. They are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric airplanes, electric ships, and electric tools.

[0005] As the application scope of lithium-ion batteries continues to expand, how to effectively reduce the risk of battery lithium plating has attracted more and more attention from those skilled in the art.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides an electrode assembly manufacturing device and method, and the electrode assembly manufactured by the electrode assembly manufacturing device can effectively reduce the risk of battery lithium plating.

[0008] In a first aspect, some embodiments of the present application provide an electrode assembly manufacturing device, comprising a winding needle and a heating component. The winding needle is used to wind the electrode sheet and separator to form a wound structure, and the heating component is used to be inserted into the winding center of the wound structure and heat the wound structure. Through the above-mentioned manufacturing device, the heating component can heat the wound structure at the winding center of the wound structure, causing at least some ion channels in the separator of the inner ring of the wound structure to melt and close, thereby blocking the shuttling of ions, which is beneficial to reducing lithium plating in the wound structure and can effectively reduce the risk of lithium plating in the battery.

[0009] According to the manufacturing equipment provided by some embodiments of the present application, two heating components are provided, and the two heating components can move away from each other and flatten the winding structure to reshape the winding structure.

[0010] According to the manufacturing equipment provided in some embodiments of the present application, the manufacturing equipment also includes a pressurizing component arranged opposite to the heating component. The pressurizing component and the heating component are respectively located on the outside and inside of the winding structure and clamp the winding structure, so that the insulating member of the winding structure is re-bonded to the pole piece and is compressed thinner, which can not only reduce the bending degree of the winding structure, but also improve the consistency of the winding gap of the winding structure, which is conducive to the shaping of the winding structure.

[0011] According to the manufacturing equipment provided in some embodiments of the present application, the winding needle is provided with an avoidance recess, which is recessed inward from the outer circumference of the winding needle; the heating component is inserted into the winding center through the avoidance recess, so that after the winding needle withdraws from the winding center, the heating component can remain in the winding center, thereby facilitating flattening and heating the winding structure.

[0012] According to the manufacturing equipment provided in some embodiments of the present application, the heating component includes a cover body and a heating lamp, the cover body is sleeved on the outer periphery of the heating lamp, the cover body includes a shielding part and a light-transmitting part that are interconnected, and the light-transmitting part is arranged toward the winding structure, so that the light emitted by the heating lamp passes through the light-transmitting part to irradiate the preset position of the winding structure, so as to heat the preset position.

[0013] According to the manufacturing equipment provided in some embodiments of the present application, the light-transmitting portion and the shielding portion are connected along the circumference of the cover body, and the range of the central angle of the light-transmitting portion corresponding to the cover body is set to 10° to 90°, so that the heating component can heat the designated area, reducing the possibility of capacity loss of the winding structure due to heating over a large area.

[0014] According to the manufacturing equipment provided in some embodiments of the present application, the light-transmitting portion extends along the axial direction of the heating component, and the size of the light-transmitting portion in the axial direction is larger than the size of the winding structure in the axial direction, so that the entire continuous area in the axial direction of the designated area in the winding structure can be heated by the heating component, which can effectively reduce the possibility of lithium deposition in the bending area.

[0015] According to the manufacturing equipment provided by some embodiments of the present application, the heating lamp includes at least one of an infrared lamp, a laser infrared lamp, a ceramic heating lamp, and a UVA lamp.

[0016] According to the manufacturing equipment provided in some embodiments of the present application, the heating component also includes a temperature sensor, which is used to detect the temperature of the winding structure, which is conducive to achieving temperature control of the heating area of ​​the winding structure and facilitating controlling the temperature of the heating area of ​​the winding structure within an appropriate range.

[0017] According to the manufacturing equipment provided by some embodiments of the present application, the heating device further includes a control unit, which is communicatively connected with the temperature sensor and the heating component.

[0018] According to the manufacturing equipment provided by some embodiments of the present application, the pressurizing component includes a first abutting surface, and the heating component includes a second abutting surface. The first abutting surface is configured as a concave arc surface, and the second abutting surface is configured as a convex arc surface. The pressurizing component is abutted against the outer side of the winding structure through the first abutting surface, and the heating component is abutted against the inner side of the winding structure through the second abutting surface, which is beneficial to increasing the contact area between the first abutting surface and the second abutting surface and the winding structure, and is beneficial to improving the stability of the pressing of the first abutting surface and the second abutting surface against the winding structure.

[0019] In a second aspect, some embodiments of the present application further provide a method for manufacturing an electrode assembly, the method comprising:

[0020] Winding the pole piece and the separator to form a winding structure;

[0021] The wound structure is heated at a winding center of the wound structure.

[0022] According to the manufacturing method provided in some embodiments of the present application, heating the wound structure further comprises:

[0023] The winding structure is clamped and pressed to bond the pole piece and the separator.

[0024] The technical solutions provided by the embodiments of the present disclosure bring at least the following beneficial effects:

[0025] Some embodiments of the present application provide an electrode assembly manufacturing device, which includes a winding needle and a heating component. The winding needle is used to wind the electrode sheet and the separator to form a wound structure, and the heating component is used to be inserted into the winding center of the wound structure and heat the wound structure. Through the above-mentioned manufacturing device, the heating component can heat the wound structure at the winding center of the wound structure, causing at least some ion channels in the separator of the inner ring of the wound structure to melt and close, blocking the shuttling of ions, which is beneficial to reducing lithium plating in the wound structure and can effectively reduce the risk of lithium plating in the battery.

[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0028] FIG1 is an exploded view of a battery provided in some embodiments of the present application;

[0029] FIG2 is a schematic diagram of a disassembled battery module provided in some embodiments of the present application;

[0030] FIG3 is a schematic diagram of a winding needle in a winding structure provided by some embodiments of the present application;

[0031] FIG4 is a schematic diagram of a heating component provided by some embodiments of the present application in a state where the winding structure is flattened;

[0032] FIG5 is a schematic diagram of a portion of the structure of an electrode assembly manufacturing device provided in some embodiments of the present application;

[0033] FIG6 is a schematic structural diagram of a heating component provided in some embodiments of the present application;

[0034] FIG7 is a cross-sectional view of a heating component provided in some embodiments of the present application.

[0035] The figure numbers in the specific implementation method are as follows: 1. Winding needle; 11. Avoidance recess; 2. Heating component; 21. Cover body; 211. Light-transmitting portion; 212. Shielding portion; 213. Second abutting surface; 22. Heating lamp; 3. Pressurizing component; 31. First abutting surface; 4. Spreading assembly; 41. Clamp; 5. Box body; 5a. First box body part; 5b. Second box body part; 5c. Accommodating space; 6. Battery module; 7. Battery cell; 71. Winding structure; 8. Battery. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0038] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0041] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0042] In the embodiments of this application, "parallel" includes not only absolute parallelism but also approximately parallelism as commonly understood in engineering practice. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximately perpendicularity as commonly understood in engineering practice. For example, if the angle between two directions is 85°-90°, they are considered perpendicular; if the angle between two directions is 0°-5°, they are considered parallel.

[0043] The term "plurality" used in this application refers to two or more (including two).

[0044] Currently, judging by market developments, batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace.

[0045] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0046] The battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0047] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0048] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, located between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes and provides ion channels for the active ions to pass through.

[0049] When the battery cell is charging, metal ions are released from the positive electrode and embedded in the negative electrode. However, some abnormal situations may occur, causing the precipitation of metal ions and the risk of short circuit between the positive and negative electrodes.

[0050] For example, taking a lithium-ion battery cell as an example, due to insufficient lithium embedding space in the negative electrode, too much resistance to lithium ion embedding in the negative electrode, or too fast lithium ion escapes from the positive electrode, the escaped lithium ions cannot be embedded in the negative electrode in equal amounts. The lithium ions that cannot be embedded in the negative electrode can only obtain electrons on the surface of the negative electrode, thereby forming metallic lithium. This is the lithium plating phenomenon. Lithium plating not only reduces the performance of lithium-ion battery cells and significantly shortens the cycle life, but also limits the fast charging capacity of lithium-ion battery cells. In addition, when lithium plating occurs in a battery cell, the precipitated lithium metal is very active and can react with the electrolyte at a lower temperature, causing the starting temperature of the battery cell's self-heating to decrease and the self-heating rate to increase, seriously endangering the safety of the battery cell.

[0051] The wound electrode assembly is more prone to lithium deposition in its bending area, and the main reason for the lithium deposition is that the positive and negative electrode sheets located in the bending area need to be bent, and the positive electrode active material layer and the negative electrode active material layer are prone to stress concentration during the bending process and cause the respective active materials to fall off. Due to the shedding of active materials, especially the shedding of active materials on the negative electrode sheet, the number of lithium insertion sites of the negative electrode active material layer of the negative electrode sheet may be less than the number of lithium ions that can be provided by the positive electrode active material layer of the adjacent positive electrode sheet, thereby causing lithium deposition. When lithium deposition is severe, the released lithium ions can form lithium crystals on the surface of the negative electrode sheet, and the lithium crystals can easily puncture the separator, causing the risk of short circuit between the adjacent positive and negative electrode sheets.

[0052] In view of this, an embodiment of the present application provides a manufacturing device for an electrode assembly, in which a winding needle can wind the electrode and the isolation member to form a winding structure, and a heating component can be inserted into the winding center of the winding structure to heat the winding structure, so that at least part of the ion channels in the isolation member of the inner circle of the winding structure are melted and closed, so that the shuttling of ions is blocked, which is beneficial to reducing lithium plating of the winding structure and can effectively reduce the risk of lithium plating in the battery.

[0053] The electrode assembly manufacturing equipment provided in the embodiments of the present application can be applied to the battery manufacturing process. The manufactured electrode assembly can be used to produce batteries. The produced batteries can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. Batteries manufactured using the electrode assembly manufacturing equipment disclosed in this application can be used to form the power supply system of such electrical devices. This helps reduce the risk of lithium deposition in batteries.

[0054] The electrical devices provided in the embodiments of the present application may be vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include aircraft, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0055] Figure 1 is an exploded view of a battery according to some embodiments of the present invention. As shown in Figure 1 , a battery 8 includes a housing 5 and a battery cell (not shown), which is housed within the housing 5. A battery cell is the smallest unit of a battery.

[0056] The housing 5 is used to house battery cells and can have various structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b. The first housing portion 5a and the second housing portion 5b overlap each other, and the first housing portion 5a and the second housing portion 5b together define a storage space 5c for accommodating the battery cells. The second housing portion 5b can be a hollow structure with one end open. The first housing portion 5a is a plate-like structure, and the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. The first housing portion 5a and the second housing portion 5b can also be hollow structures with one end open. The open side of the first housing portion 5a overlaps the open side of the second housing portion 5b to form the housing 5 with the storage space 5c. Of course, the first housing portion 5a and the second housing portion 5b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0057] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0058] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box body.

[0059] In battery 8, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery module can be housed within housing 5. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 6, and then the battery modules 6 can be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within housing 5.

[0060] FIG2 is a schematic diagram of an explosion of the battery module shown in FIG1 .

[0061] As shown in FIG2 , in some embodiments, there are multiple battery cells 7, which are first connected in series, in parallel, or in hybrid to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in hybrid to form a whole and accommodated in a box.

[0062] The multiple battery cells 7 in the battery module 6 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0063] The battery cell 7 may be a cylindrical battery cell, a square battery cell, or a battery cell of other shapes.

[0064] Some embodiments of the present application provide a manufacturing device for an electrode assembly, as shown in Figure 3, the manufacturing device includes a winding needle 1 and a heating component 2, the winding needle 1 is used to wind the electrode sheet and the isolation member to form a winding structure 71, and the heating component 2 is used to be inserted into the winding center of the winding structure 71 and heat the winding structure 71.

[0065] The winding needle 1 may be a component used to wind the electrode and separator to form a wound structure 71. The separator is an insulator with an ion channel. After the electrode and separator are stacked and wound, the separator can isolate two adjacent electrode layers, reducing the possibility of short circuits. At the same time, the ion channel allows active ions to pass through.

[0066] For example, the winding needle 1 may have a cylindrical structure, and the winding structure 71 formed by the winding thereof may be a cylindrical winding structure 71 having a winding center. In some embodiments, the winding needle 1 may also have a columnar structure, such as a prismatic structure or an elliptical columnar structure, so that the winding needle 1 can exert sufficient force on the electrode piece and the separator to wind the electrode piece and the separator. The prismatic structure may be a columnar structure having a regular polygonal cross-section, such as a regular hexagonal prism structure.

[0067] The heating element 2 can be a component used to heat the coiled structure 71 formed by the electrode and the separator. By using the heating element 2 to heat the coiled structure 71, the separator in the coiled structure 71 is heated and melted, at least partially closing the ion channel, thereby preventing the shuttle of ions in the separator.

[0068] Because the inner ring of the coiled structure 71 is more bent and subjected to greater stress, it is more susceptible to lithium deposition. By inserting the heating element 2 into the center of the coiled structure 71, the heating element 2 can heat the separator in the inner ring of the coiled structure 71, causing at least some of the ion channels in the separator to melt and close, effectively reducing the risk of lithium deposition.

[0069] For example, the heating component 2 may include but is not limited to a heating rod, a heat lamp, an electric heating wire, etc., and those skilled in the art may select one according to actual conditions.

[0070] Exemplarily, the heating component 2 heats the coiled structure 71 by raising the temperature of the coiled structure 71 to a range of 140°C to 180°C and maintaining the temperature within this temperature range for 10 seconds, which can effectively melt and close at least some of the ion channels of the coiled structure 71, thereby effectively reducing the risk of lithium deposition. In some embodiments, the heating component 2 raises the temperature of the coiled structure 71 to a range of 150°C to 170°C. Exemplarily, the heating component 2 can raise the temperature of the coiled structure 71 to 155°C, 160°C, or 165°C, so that some of the ion channels in the coiled structure 71 can be smoothly melted and closed, effectively reducing lithium deposition.

[0071] In some embodiments, as shown in FIG. 4 , two heating components 2 are provided, and the two heating components 2 can move away from each other and flatten the winding structure 71 .

[0072] The two heating components 2 are arranged relative to each other so that after being inserted into the winding center of the winding structure 71, they can move away from each other to support the winding structure 71 in the direction of separation, thereby flattening the winding structure 71 and forming a straight area and a bent area. The two heating components 2 are respectively pressed against the inner side of the bent area. Since the pole pieces in the bent area generate stress concentration during the bending process, causing their respective active materials to fall off, it is more likely to cause lithium deposition. The heating component 2 pressed against the inner side of the bent area can melt and close the ion channel of the separator, effectively reducing the risk of lithium deposition in the battery 8.

[0073] For example, as shown in FIG5 , the manufacturing apparatus may further include a spreading assembly 4, with two heating components 2 connected to the output end of the spreading assembly 4, capable of flattening the coiled structure 71 under the action of the spreading assembly 4. In some embodiments, the spreading assembly 4 may include a clamping jaw 41, which can drive the heating components 2 under the action of hydraulic pressure or a motor.

[0074] In some embodiments, the manufacturing equipment further includes a pressurizing component 3 disposed opposite to the heating component 2 . The pressurizing component 3 and the heating component 2 are respectively located on the outside and inside of the winding structure 71 and clamp the winding structure 71 .

[0075] The pressurizing component 3 may be a component for pressing the wound structure 71. The heating component 2 heats the bend area of ​​the wound structure 71, melting the separator and softening it. Pressing the bend area of ​​the wound structure 71 re-bonds the separator to the electrode and thins it. This not only reduces the degree of bending in the bend area but also improves the consistency of the winding gap in the bend area, facilitating the shaping of the bend area of ​​the wound structure 71.

[0076] By arranging the pressurizing component 3 and the heating component 2 opposite to each other and arranging them on the outside and inside of the winding structure 71 respectively, the pressurizing component 3 and the heating component 2 can clamp and press the winding structure 71 therebetween by being relatively close to each other, so as to perform good pressing on the winding structure 71.

[0077] In some embodiments, the pressurizing component 3 can be connected to the clamping jaws 41 of the stretching assembly 4 . Under the action of the clamping jaws 41 , the pressurizing component 3 and the heating component 2 can approach each other to clamp and press the winding structure 71 .

[0078] In some embodiments, the winding needle 1 is provided with an avoidance recess 11 , which is recessed inward from the outer circumference of the winding needle 1 ; the heating component 2 is inserted into the winding center through the avoidance recess 11 .

[0079] The relief recess 11 can be a recessed structure provided on the winding needle 1, formed by an inward depression on the outer circumference of the winding needle 1. The heating component 2 is inserted into the winding center through the relief recess 11. Alternatively, the heating component 2 can be placed in the relief recess 11 and extend into the winding center of the winding structure 71 along with the winding needle 1. By integrating the heating component 2 into the recessed structure of the winding needle 1, the heating component 2 can remain in the winding center after the winding needle 1 exits, facilitating flattening and heating of the winding structure 71.

[0080] In some embodiments, the avoidance recess 11 can be formed by removing material from the winding needle 1 through machining such as milling, or can be formed simultaneously with the winding needle 1 through an integral molding process such as casting.

[0081] In some embodiments, as shown in FIG6 , the heating component 2 includes a cover 21 and a heating lamp 22, wherein the cover 21 is sleeved around the outer periphery of the heating lamp 22. As shown in FIG7 , the cover 21 includes a shielding portion 212 and a light-transmitting portion 211 connected to each other, wherein the light-transmitting portion 211 is disposed toward the winding structure 71.

[0082] The cover 21 may be a wall structure around the outer periphery of the heating component 2, which is placed around the outer periphery of the heating lamp 22 and has a strong structural strength, so that it can provide sufficient force to flatten the coiled structure 71. The heating lamp 22 may be a heating component 2 that heats the coiled structure 71 by irradiating the coiled structure 71 with light.

[0083] The shielding portion 212 and the light-transmitting portion 211 are respectively different parts of the cover body 21, wherein the shielding portion 212 can be a part for blocking the light emitted by the heating lamp 22, which can block the light from irradiating in a preset direction to reduce the influence of the light on the position of the winding structure 71 that does not need to be heated, and the light-transmitting portion 211 can be a part for passing the light emitted by the heating lamp 22. Through the cooperation of the shielding portion 212 and the light-transmitting portion 211, the light emitted by the heating lamp 22 is irradiated to the preset position of the winding structure 71 through the light-transmitting portion 211 so as to heat the preset position.

[0084] In some embodiments, the shielding portion 212 can be made of a quartz mixed metal such as ferrosilicon or silicon steel, which not only provides the shielding portion 212 with good structural strength but also has good high-temperature resistance. For example, the light-transmitting portion 211 can be made of high-temperature resistant glass, allowing light from the heating lamp 22 to pass through the light-transmitting portion 211 and be emitted to a predetermined position of the winding structure 71.

[0085] The light-transmitting portion 211 is disposed toward the winding structure 71 , and may be disposed toward a bending region of the winding structure 71 , so that the heating component 2 can heat the bending region through light.

[0086] In some embodiments, the light-transmitting portion 211 and the shielding portion 212 are connected along the circumference of the cover body 21 , and the central angle of the light-transmitting portion 211 relative to the cover body 21 is set to range from 10° to 90°.

[0087] The light-transmitting portion 211 and the shielding portion 212 are connected along the circumference of the cover 21, and can be arranged along the circumference of the cover 21. By setting the range of the central angle of the light-transmitting portion 211 relative to the cover 21 to 10° to 90°, the heating component 2 can heat a specific area, thereby reducing the possibility of capacity loss caused by heating a large area of ​​the winding structure 71.

[0088] For example, the central angle of the light-transmitting portion 211 relative to the cover 21 can be set to a range of 30° to 40°, which facilitates control of the heating range of the bending area by the heating component 2 and reduces heating of a large area of ​​the coiled structure 71. In some embodiments, the central angle of the light-transmitting portion 211 relative to the cover 21 can be set to a range of 30°, 35°, or 40°, so that the heating component 2 can heat an appropriate area of ​​the coiled structure 71 and reduce the possibility of heating a large area of ​​the coiled structure 71.

[0089] For example, the range of the central angle of the light-transmitting portion 211 relative to the cover body 21 can be set to 70° to 80°, which facilitates the control of the heating range of the bending area by the heating component 2, and can achieve heating of a larger area of ​​the coiled structure 71. In some embodiments, the range of the central angle of the light-transmitting portion 211 relative to the cover body 21 can be set to 70°, 75°, or 80°, so that the heating component 2 can heat a larger range of the designated area of ​​the coiled structure 71, achieving heating of a larger area of ​​the coiled structure 71.

[0090] In some embodiments, the light-transmitting portion 211 extends along the axial direction of the heating component 2 , and a size of the light-transmitting portion 211 in the axial direction is larger than a size of the winding structure 71 in the axial direction.

[0091] The light-transmitting portion 211 extends along the axial direction of the heating component 2. Both the light-transmitting portion 211 and the shielding portion 212 may extend along the axial direction of the heating component 2. When the heating component 2 is inserted into the winding center, the light-transmitting portion 211 can heat a continuous area of ​​the winding structure 71 along the axial direction of the heating component 2, thereby heating a continuous area within the bending region of the winding structure 71. By setting the axial dimension of the light-transmitting portion 211 to be larger than the axial dimension of the winding structure 71, the entire continuous axial region of the bending region of the winding structure 71 can be heated by the heating component 2, effectively reducing the possibility of lithium deposition in the bending region.

[0092] In some embodiments, the heating lamp 22 includes at least one of an infrared lamp, a laser infrared lamp, a ceramic heating lamp 22 , and a UVA lamp.

[0093] Infrared lamps, laser infrared lamps, ceramic heating lamps 22, and UVA lamps are all devices that can use the light they emit to heat external devices. By making the heating lamp 22 include at least one of the infrared lamps, laser infrared lamps, ceramic heating lamps 22, and UVA lamps, the heating lamp 22 can heat the winding structure 71 by emitting light.

[0094] The heating lamp 22 includes at least one of an infrared lamp, a laser infrared lamp, a ceramic heating lamp 22, and a UVA lamp. The heating lamp 22 can be an infrared lamp, a laser infrared lamp, a ceramic heating lamp 22, or a UVA lamp; or the heating lamp 22 includes multiple heating sections, each of which can be an infrared lamp, a laser infrared lamp, a ceramic heating lamp 22, or a UVA lamp.

[0095] In some embodiments, the heating component 2 further includes a temperature sensor, and the temperature sensor is used to detect the temperature of the winding structure 71 .

[0096] The temperature sensor can be a device for detecting the temperature of the heated area of ​​the coiled structure 71. Providing a temperature sensor in the heating component 2 facilitates temperature control of the heated area of ​​the coiled structure 71, facilitating control of the temperature within the range of 140°C to 180°C.

[0097] In some embodiments, the heating device further includes a control unit, which is communicatively connected with the temperature sensor and the heating component 2 .

[0098] The control unit can be a centralized or distributed controller. For example, the control unit can be a single single-chip microcomputer or a distributed multiple single-chip microcomputer. The single-chip microcomputer can run a control program to control the heating component 2 to realize its function. For example, when the temperature sensor detects that the temperature of the heating area of ​​the winding structure 71 is lower than 140°C, the control unit can control the heating component 2 to heat the winding structure 71 so that the temperature rises to a range of 140°C to 180°C; when the temperature sensor detects that the temperature of the heating area of ​​the winding structure 71 is higher than 180°C, the control unit can control the heating component 2 to stop heating the winding structure 71 so that the temperature falls back to the range of 140°C to 180°C; when the temperature sensor detects that the temperature of the heating area of ​​the winding structure 71 is within the range of 140°C to 180°C, the control unit can control the heating component 2 to stop heating the winding structure 71.

[0099] In some embodiments, the pressure component 3 includes a first supporting surface 31, and the heating component 2 includes a second supporting surface 213. The first supporting surface 31 is configured as a concave arc surface, and the second supporting surface 213 is configured as a convex arc surface. The pressure component is supported on the outer side of the winding structure 71 through the first supporting surface 31, and the heating component 2 is supported on the inner side of the winding structure 71 through the second supporting surface 213.

[0100] The first abutting surface 31 can be the surface of the pressure component 3, which is used to abut against the winding structure 71. The second abutting surface 213 can be the surface of the heating component 2, which is used to abut against the winding structure 71. By clamping the first abutting surface 31 and the second abutting surface 213 on the outer side and the inner side of the winding structure 71, the winding structure 71 can be pressed together.

[0101] By configuring the first supporting surface 31 that supports the outer side of the winding structure 71 as a concave arc surface and configuring the second supporting surface 213 that supports the inner side of the winding structure 71 as a convex arc surface, it is beneficial to increase the contact area between the first supporting surface 31 and the second supporting surface 213 and the winding structure 71, and it is beneficial to improve the stability of the pressing of the first supporting surface 31 and the second supporting surface 213 on the winding structure 71.

[0102] Some embodiments of the present application also provide a method for manufacturing an electrode assembly, the method comprising the following steps:

[0103] S1. Winding the pole piece and the separator to form a winding structure 71.

[0104] The above steps can be performed using the manufacturing equipment for the electrode assembly provided by the aforementioned technical solution, and the stacked electrode sheets and separators are wound using a winding needle 1 to form a wound structure 71 .

[0105] S2 . Heating the wound structure 71 at the winding center of the wound structure 71 .

[0106] The above steps can be performed using the manufacturing equipment of the electrode assembly provided by the aforementioned technical solution. The winding structure 71 is heated by inserting the heating component 2 into the winding center of the winding structure 71, so that the isolation member in the winding structure 71 is melted by the heat, and at least part of the ion channel is closed, so that the shuttle of ions in the isolation member is blocked, which can effectively reduce the risk of lithium deposition in the winding structure 71.

[0107] In some embodiments, heating the wound structure 71 also includes clamping and pressing the wound structure 71 to bond the pole piece and the separator.

[0108] By clamping and pressing the winding structure 71 while heating it, the isolation member in the winding structure 71 is re-bonded to the pole piece and thinned, which can improve the consistency of the winding gap of the winding structure 71 and facilitate the shaping of the winding structure 71.

[0109] Some embodiments of the present application provide a manufacturing device for an electrode assembly, as shown in FIG3 , the manufacturing device for the electrode assembly includes a winding needle 1, two heating components 2, and two pressurizing components 3. The heating component 2 is inserted into the winding center through an avoidance recess 11 provided on the winding needle 1. The heating component 2 and the pressurizing component 3 are provided in pairs, and the two pairs of heating components 2 and pressurizing components 3 are respectively connected to the two clamping claws 41 of the expansion assembly 4. As shown in FIG4 , the first abutting surface 31 of the heating component 2, which is a concave arc surface, and the second abutting surface 213 of the pressurizing component 3, which is a convex arc surface, respectively abut against the outer side and inner side of the winding structure 71, for pressing the winding structure 71. As shown in FIG7 , the heating component 2 includes a cover body 21 and a heating lamp 22. The light-transmitting portion 211 and the shielding portion 212 in the cover body 21 are connected along the circumference of the cover body 21, and the light-transmitting portion 211 faces the bending area of ​​the winding structure 71 to heat the bending area of ​​the winding structure 71.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A manufacturing device for an electrode assembly, comprising: A winding needle, used to wind the pole piece and the separator and form a winding structure; A heating component is used for being inserted into the winding center of the winding structure and heating the winding structure.

2. The manufacturing equipment according to claim 1, wherein: The two heating components are provided with two heating components, and the two heating components can move away from each other and flatten the winding structure.

3. The manufacturing equipment according to claim 1 or 2, wherein: The manufacturing equipment further includes a pressurizing component disposed opposite to the heating component, wherein the pressurizing component and the heating component are respectively located at an outer side and an inner side of the winding structure and clamp the winding structure.

4. The manufacturing equipment according to claim 3, wherein: The winding needle is provided with an avoidance recess, and the avoidance recess is recessed inward from the outer circumference of the winding needle; The heating member is inserted into the winding center through the escape recess.

5. The manufacturing equipment according to claim 3 or 4, wherein: The pressurizing component includes a first abutting surface, and the heating component includes a second abutting surface. The first abutting surface is configured as a concave arc surface, and the second abutting surface is configured as a convex arc surface. The pressurizing component is abutted against the outer side of the winding structure through the first abutting surface, and the heating component is abutted against the inner side of the winding structure through the second abutting surface.

6. The manufacturing equipment according to any one of claims 1 to 5, wherein: The heating component comprises a cover body and a heating lamp. The cover body is sleeved on the outer circumference of the heating lamp. The cover body comprises a shielding portion and a light-transmitting portion connected to each other. The light-transmitting portion is arranged toward the winding structure.

7. The manufacturing apparatus according to claim 6, wherein: The light-transmitting portion and the shielding portion are connected along the circumferential direction of the cover body, and the range of the central angle of the light-transmitting portion corresponding to the cover body is set to be 10° to 90°.

8. The manufacturing equipment according to claim 6 or 7, wherein: The light-transmitting portion extends along an axial direction of the heating component, and a dimension of the light-transmitting portion in the axial direction is greater than a dimension of the winding structure in the axial direction.

9. The manufacturing equipment according to any one of claims 6 to 8, wherein: The heating lamp includes at least one of an infrared lamp, a laser infrared lamp, a ceramic heating lamp, and a UVA lamp.

10. The manufacturing equipment according to any one of claims 1 to 9, wherein: The heating component further includes a temperature sensor, and the temperature sensor is used to detect the temperature of the winding structure.

11. The manufacturing apparatus according to claim 10, wherein: The manufacturing equipment further includes a control unit communicatively connected to the temperature sensor and the heating component.

12. A method for manufacturing an electrode assembly, comprising: Winding the pole piece and the separator to form a winding structure; The wound structure is heated at a winding center of the wound structure.

13. The manufacturing method according to claim 12, wherein: Heating the wound structure at the winding center of the wound structure further comprises: The winding structure is clamped and pressed to bond the pole piece and the isolation member.

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