Apparatus and method for manufacturing electrode assembly

Abstract

The invention provides an electrode assembly manufacturing device and method, the electrode assembly manufacturing device comprises a winding needle and a heating part, the winding needle is used for winding a pole piece and a separator and forming a winding structure, and the heating part is used for being inserted into the winding center of the winding structure and heating the winding structure. According to the manufacturing equipment, the heating component can heat the winding structure at the winding center of the winding structure, so that at least part of ion channels in the separator of the inner ring in the winding structure are fused and closed, shuttling of ions is blocked, lithium precipitation of the winding structure can be reduced, and the risk of lithium precipitation of the battery can be effectively reduced.

Description

Technical Field

[0001] 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

[0002] 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, electric tools, etc.

[0003] As the application scope of lithium-ion batteries continues to expand, how to effectively reduce the risk of battery lithium deposition has attracted more and more attention from technicians in this field. Summary of the invention

[0004] 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 deposition.

[0005] In the first aspect, some embodiments of the present application provide a manufacturing device for an electrode assembly, the manufacturing device for the electrode assembly comprising a winding needle and a heating component, the winding needle is used to wind the pole piece and the separator to form a winding structure, and the heating component is used to insert the winding center of the winding structure and heat the winding structure. Through the above-mentioned manufacturing equipment, the heating component can heat the winding structure at the winding center of the winding structure, so that at least part of the ion channels in the separator of the inner circle of the winding structure are melted and closed, blocking the shuttling of ions, which is conducive to reducing the lithium deposition of the winding structure, and can effectively reduce the risk of lithium deposition of the battery.

[0006] According to the manufacturing equipment provided by some embodiments of the present application, the heating components are provided in two, and the two heating components can move away from each other and flatten the winding structure to reshape the winding structure.

[0007] According to the manufacturing equipment provided by some embodiments of the present application, the manufacturing equipment also includes a pressurizing component arranged opposite to the heating component, and 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 isolation piece of the winding structure is re-bonded to the pole piece and is thinned, 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 beneficial to the shaping of the winding structure.

[0008] According to the manufacturing equipment provided by 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.

[0009] According to the manufacturing equipment provided by 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 circumference 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 a preset position of the winding structure, so as to heat the preset position.

[0010] According to the manufacturing equipment provided by 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.

[0011] 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 a 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.

[0012] 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.

[0013] According to the manufacturing equipment provided by 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.

[0014] According to the manufacturing equipment provided by some embodiments of the present application, the heating device also includes a control unit, and the control unit is communicatively connected with the temperature sensor and the heating component.

[0015] 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 increase the contact area between the first abutting surface and the second abutting surface and the winding structure, and is beneficial to improve the stability of the pressing of the first abutting surface and the second abutting surface against the winding structure.

[0016] In a second aspect, some embodiments of the present application further provide a method for manufacturing an electrode assembly, the manufacturing method comprising:

[0017] Winding the pole piece and the separator to form a winding structure;

[0018] The wound structure is heated at a winding center of the wound structure.

[0019] According to the manufacturing method provided by some embodiments of the present application, heating the winding structure further comprises:

[0020] The winding structure is clamped and pressed to bond the pole piece and the isolation member.

[0021] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0022] Some embodiments of the present application provide a manufacturing device for an electrode assembly, the manufacturing device for the electrode assembly includes a winding needle and a heating component, the winding needle is used to wind the pole piece and the separator to form a winding structure, and the heating component is used to insert the winding center of the winding structure and heat the winding structure. Through the above-mentioned manufacturing equipment, the heating component can heat the winding structure at the winding center of the winding structure, so that at least part of the ion channels in the separator of the inner circle of the winding structure melt and close, blocking the shuttling of ions, which is conducive to reducing the lithium deposition of the winding structure, and can effectively reduce the risk of lithium deposition of the battery.

[0023] 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

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 An exploded view of a battery provided in some embodiments of the present application;

[0026] Figure 2 A schematic diagram of disassembling a battery module provided in some embodiments of the present application;

[0027] Figure 3 A schematic diagram of a winding needle in a winding structure provided in some embodiments of the present application;

[0028] Figure 4 A schematic diagram of a heating component provided in some embodiments of the present application in a state where the winding structure is flattened;

[0029] Figure 5 A schematic diagram of a portion of the structure of a manufacturing device for an electrode assembly provided in some embodiments of the present application;

[0030] Figure 6 A schematic diagram of the structure of a heating component provided in some embodiments of the present application;

[0031] Figure 7 A cross-sectional view of a heating component provided in some embodiments of the present application.

[0032] The reference numerals in the specific implementation manner are as follows:

[0033] 1. Winding needle; 11. Avoiding recess; 2. Heating component; 21. Cover; 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. Clamping claw; 5. Box; 5a. First box portion; 5b. Second box portion; 5c. Accommodating space; 6. Battery module; 7. Battery cell; 71. Winding structure; 8. Battery. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0036] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0040] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the absolutely perpendicular situation, but also the roughly perpendicular situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0041] The term "plurality" used in the present application refers to two or more (including two).

[0042] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0043] 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.

[0044] The battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0045] The battery cells may 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.

[0046] A battery cell generally includes an electrode assembly. The electrode 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 embedded and removed between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting. At the same time, the ion channel arranged on it allows the active ions to pass through.

[0047] 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 metal ions to precipitate, resulting in the risk of short circuit between the positive and negative electrodes.

[0048] For example, taking a lithium-ion battery cell as an example, due to insufficient lithium embedding space in the negative electrode sheet, too much resistance to lithium ion embedding in the negative electrode sheet, or too fast lithium ion escapes from the positive electrode sheet, the escaped lithium ions cannot be embedded in the negative electrode sheet in equal amounts. The lithium ions that cannot be embedded in the negative electrode sheet can only obtain electrons on the surface of the negative electrode sheet, thereby forming metallic lithium. This is the lithium precipitation phenomenon. Lithium precipitation not only reduces the performance of lithium-ion battery cells and greatly shortens the cycle life, but also limits the fast charging capacity of lithium-ion battery cells. In addition, when lithium precipitation occurs in the battery cell, the precipitated lithium metal is very active and can react with the electrolyte at a lower temperature, causing the starting temperature of self-heat generation in the battery cell to decrease and the self-heat generation rate to increase, seriously endangering the safety of the battery cell.

[0049] The winding 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 and negative electrode active material layers 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 ions that can be provided by the negative electrode active material layer of the negative electrode sheet may be less than that of 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.

[0050] 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 sheet 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.

[0051] The manufacturing equipment of an electrode assembly provided in the embodiment of the present application can be applied to the manufacturing process of a battery, and the manufactured electrode assembly can be used to produce batteries, and the manufactured batteries can be used in but not limited to electric devices such as vehicles, ships or aircraft, and the batteries manufactured by the manufacturing equipment of the electrode assembly disclosed in the present application can be used to form the power supply system of the electric device. In this way, the risk of lithium deposition in the battery is reduced.

[0052] The electrical device provided in the embodiment of the present application may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc.

[0053] Figure 1 Schematic diagram of an explosion of a battery provided in some embodiments of the present application. Figure 1 As shown, the battery 8 includes a housing 5 and a battery cell (not shown), and the battery cell is accommodated in the housing 5. The battery cell may be the smallest unit constituting the battery.

[0054] The box 5 is used to accommodate the battery cells, and the box 5 can be of various structures. In some embodiments, the box 5 can include a first box portion 5a and a second box portion 5b, the first box portion 5a and the second box portion 5b cover each other, and the first box portion 5a and the second box portion 5b jointly define a storage space 5c for accommodating the battery cells. The second box portion 5b can be a hollow structure with one end open, the first box portion 5a is a plate-like structure, and the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c; the first box portion 5a and the second box portion 5b can also be hollow structures with one side open, and the open side of the first box portion 5a covers the open side of the second box portion 5b to form a box 5 with a storage space 5c. Of course, the first box portion 5a and the second box portion 5b can be of various shapes, such as a cylinder, a cuboid, etc.

[0055] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0056] 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.

[0057] In the battery 8, there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells are both connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box 5; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 6, and the multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5.

[0058] Figure 2 for Figure 1 An exploded schematic diagram of the battery module is shown.

[0059] like Figure 2 As shown, in some embodiments, there are multiple battery cells 7, and the multiple battery cells 7 are first connected in series, in parallel, or in mixed connection to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in a box.

[0060] The multiple battery cells 7 in the battery module 6 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0061] The battery cell 7 may be a cylindrical battery cell, a square battery cell, or a battery cell of other shapes.

[0062] Some embodiments of the present application provide a manufacturing device for an electrode assembly, such as Figure 3 As shown, the manufacturing equipment includes a winding needle 1 and a heating component 2, the winding needle 1 is used to wind the pole piece and the separator 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.

[0063] The winding needle 1 may be a component for winding the pole piece and the separator to form a winding structure 71. The separator is an insulator with an ion channel. After the pole piece and the separator are stacked and wound, the separator can isolate two adjacent pole pieces to reduce the possibility of short circuit, and at the same time, the active ions can be shuttled through by using the set ion channel.

[0064] Exemplarily, the winding needle 1 may be a cylindrical structure, and the winding structure 71 formed by winding may be a cylindrical winding structure 71 having a winding center. In some embodiments, the winding needle 1 may also be 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 pole piece and the separator to wind the pole piece and the separator. Among them, the prismatic structure may be a columnar structure having a regular polygonal cross-sectional shape such as a regular hexagonal prism structure.

[0065] The heating component 2 may be a component for heating the winding structure 71 formed by the pole piece and the separator. By heating the winding structure 71 with the heating component 2, the separator 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 separator is blocked.

[0066] Since the inner circle of the winding structure 71 is bent to a greater extent and is subjected to greater stress, lithium deposition is more likely to occur in the inner circle of the winding structure 71. By inserting the heating component 2 into the winding center of the winding structure 71, the heating component 2 can heat the separator of the inner circle of the winding structure 71, so that at least part of the ion channels of the separator located in the inner circle are melted and closed, which can effectively reduce the risk of lithium deposition.

[0067] Exemplarily, 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.

[0068] Exemplarily, the heating of the winding structure 71 by the heating component 2 may be to raise the temperature of the winding structure 71 to a range of 140°C to 180°C, and maintain the temperature within the temperature range for 10S, which can effectively melt and close at least part of the ion channels of the winding structure 71, and effectively reduce the risk of lithium precipitation. In some embodiments, the range to which the temperature of the winding structure 71 is raised by the heating component 2 may be 150°C to 170°C. Exemplarily, the heating component 2 may raise the temperature of the winding structure 71 to 155°C, 160°C, or 165°C, so that part of the ion channels in the winding structure 71 can be smoothly melted and closed, effectively reducing lithium precipitation.

[0069] In some embodiments, Figure 4 As shown, two heating components 2 are provided, and the two heating components 2 can move away from each other and flatten the winding structure 71 .

[0070] The two heating components 2 are arranged relative to each other so that after the two heating components 2 are inserted into the winding center of the winding structure 71, the winding structure 71 can be supported outwardly in the separation direction through separation movement, thereby flattening the winding structure 71, so that the winding structure 71 forms a straight area and a bending area, and the two heating components 2 are respectively pressed against the inner side of the bending area. Since the pole pieces in the bending area generate stress concentration during the bending process, causing the respective active materials to fall off, it is more likely to cause lithium deposition, and the heating component 2 pressed against the inner side of the bending area can melt and close the ion channel of the separator, which can effectively reduce the risk of lithium deposition in the battery 8.

[0071] For example, Figure 5 As shown, the manufacturing equipment may further include a spreading assembly 4, and two heating components 2 are connected to the output end of the spreading assembly 4, which can flatten the winding 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 component 2 to move under the action of hydraulic pressure or a motor.

[0072] In some embodiments, the manufacturing equipment further includes a pressurizing component 3 disposed opposite to the heating component 2 , and the pressurizing component 3 and the heating component 2 are respectively located on the outer side and the inner side of the winding structure 71 and clamp the winding structure 71 .

[0073] The pressurizing component 3 may be a component for pressing the winding structure 71. The heating component 2 heats the bending area of ​​the winding structure 71 to melt the separator, so that the separator can be softened, and then the bending area of ​​the winding structure 71 is pressed, so that the separator in the bending area is re-bonded to the pole piece and pressed thin, which can not only reduce the bending degree of the bending area, but also improve the consistency of the winding gap in the bending area, which is conducive to shaping the bending area of ​​the winding structure 71.

[0074] 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 press the winding structure 71 well.

[0075] In some embodiments, the pressurizing component 3 may 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 may be brought closer to each other to clamp and press the winding structure 71 .

[0076] 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 .

[0077] The avoidance recess 11 may be a recessed structure provided on the winding needle 1, which may be formed by the outer circumference of the winding needle 1 being recessed inwardly. The heating component 2 is inserted into the winding center through the avoidance recess 11, and the heating component 2 may be placed in the avoidance recess 11 and extend into the winding center of the winding structure 71 together with the winding needle 1. The heating component 2 is integrated into the recessed structure of the winding needle 1, so that after the winding needle 1 withdraws from the winding center, the heating component 2 can remain in the winding center, which is convenient for flattening and heating the winding structure 71.

[0078] In some embodiments, the avoidance recess 11 can be formed by removing material from the winding needle 1 through mechanical processing such as milling, or can be formed simultaneously with the winding needle 1 through an integral molding process such as casting.

[0079] In some embodiments, Figure 6 As shown, the heating component 2 includes a cover 21 and a heating lamp 22, wherein the cover 21 is sleeved on the outer periphery of the heating lamp 22. Figure 7 As shown, the cover body 21 includes a shielding portion 212 and a light-transmitting portion 211 that are connected to each other, and the light-transmitting portion 211 is arranged toward the winding structure 71 .

[0080] The cover 21 may be a wall structure of the outer periphery of the heating component 2, which is sleeved on the outer periphery of the heating lamp 22 and has a strong structural strength, so that it can provide sufficient force to flatten the winding structure 71. The heating lamp 22 may be a heating component 2 that heats the winding structure 71 by irradiating the winding structure 71 with light.

[0081] 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 used to block 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 used to pass 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.

[0082] In some embodiments, the shielding portion 212 can be made of quartz mixed metals such as ferrosilicon and silicon steel, which not only makes the shielding portion 212 have good structural strength, but also makes the shielding portion 212 have good high temperature resistance. Exemplarily, the light-transmitting portion 211 can be made of high temperature resistant glass, so that the light emitted by the heating lamp 22 can pass through the light-transmitting portion 211 and be emitted to the preset position of the winding structure 71.

[0083] 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.

[0084] 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 range of the central angle of the light-transmitting portion 211 corresponding to the cover body 21 is set to be 10° to 90°.

[0085] The light-transmitting portion 211 and the shielding portion 212 are connected along the circumference of the cover body 21, and the light-transmitting portion 211 and the shielding portion 212 may be arranged along the circumference of the cover body 21. By setting the range of the central angle of the light-transmitting portion 211 corresponding to the cover body 21 to 10° to 90°, the heating component 2 can heat the designated area, thereby reducing the possibility of capacity loss of the winding structure 71 due to heating over a large area.

[0086] Exemplarily, the range of the central angle of the light-transmitting portion 211 corresponding to the cover body 21 can be set to 30° to 40°, which is convenient for controlling the heating range of the bending area by the heating component 2, and can reduce the large-area heating of the winding structure 71. In some embodiments, the range of the central angle of the light-transmitting portion 211 corresponding to the cover body 21 can be set to 30°, 35° or 40°, so that the heating component 2 can heat the appropriate area of ​​the winding structure 71, reducing the possibility of heating the winding structure 71 over a large area.

[0087] Exemplarily, the range of the central angle of the light-transmitting portion 211 corresponding to the cover body 21 can also be set to 70° to 80°, so as to facilitate the control of the heating range of the bending area by the heating component 2, and to achieve heating of a larger designated area in the winding structure 71. In some embodiments, the range of the central angle of the light-transmitting portion 211 corresponding to the cover body 21 can be set to 70°, 75° or 80°, so that the heating component 2 can heat a larger designated area of ​​the winding structure 71, and achieve heating of a larger area of ​​the winding structure 71.

[0088] 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 greater than a size of the winding structure 71 in the axial direction.

[0089] The light-transmitting portion 211 extends along the axial direction of the heating component 2, and both the light-transmitting portion 211 and the shielding portion 212 extend along the axial direction of the heating component 2, so that when the heating component 2 is inserted into the winding center, the light-transmitting portion 211 can heat the continuous area of ​​the winding structure 71 along the axial direction of the heating component 2, so as to heat the continuous area in the bending area of ​​the winding structure 71. By setting the size of the light-transmitting portion 211 in the axial direction to be larger than the size of the winding structure 71 in the axial direction, the entire continuous area of ​​the bending area in the winding structure 71 in the axial direction can be heated by the heating component 2, which can effectively reduce the possibility of lithium deposition in the bending area.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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 .

[0094] The temperature sensor may be a device for detecting the temperature of the heating area of ​​the winding structure 71. By providing the temperature sensor in the heating component 2, it is advantageous to realize the temperature control of the heating area of ​​the winding structure 71, and it is convenient to control the temperature of the heating area of ​​the winding structure 71 within the range of 140°C to 180°C.

[0095] In some embodiments, the heating device further comprises a control unit, which is communicatively connected with the temperature sensor and the heating component 2 .

[0096] 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 control program can be run in the single-chip microcomputer 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 to increase the temperature to within 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 higher than 180°C, the control unit can control the heating component 2 to stop heating the winding structure 71 to reduce the temperature to within 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.

[0097] In some embodiments, the pressure-applying 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-applying 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.

[0098] The first abutting surface 31 may be the surface of the pressurizing component 3, which is used to abut against the winding structure 71. The second abutting surface 213 may be the surface of the heating component 2, which is used to abut against the winding structure 71. The winding structure 71 can be pressed together 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.

[0099] 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.

[0100] Some embodiments of the present application also provide a method for manufacturing an electrode assembly, the method comprising the following steps:

[0101] S1. Winding the pole piece and the separator to form a winding structure 71.

[0102] The above steps can be performed using the manufacturing equipment of the electrode assembly provided by the aforementioned technical solution, and the stacked pole pieces and separators are wound using the winding needle 1 to form a winding structure 71 .

[0103] S2 . Heating the wound structure 71 at the winding center of the wound structure 71 .

[0104] The above steps can be performed using the manufacturing equipment of the electrode assembly provided by the aforementioned technical solution, by inserting the heating component 2 into the winding center of the winding structure 71 to heat the winding structure 71, so that the isolation piece in the winding structure 71 is melted by the heat, and at least part of the ion channel is closed, so that the shuttling of ions in the isolation piece is blocked, which can effectively reduce the risk of lithium deposition in the winding structure 71.

[0105] In some embodiments, the winding structure 71 is heated and the winding structure 71 is clamped and pressed to bond the pole piece and the isolation member.

[0106] 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.

[0107] Some embodiments of the present application provide a manufacturing device for an electrode assembly, such as Figure 3 As shown, the manufacturing equipment of 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 the avoidance recess 11 set on the winding needle 1. The heating component 2 and the pressurizing component 3 are arranged in pairs. The two pairs of heating components 2 and pressurizing components 3 are respectively connected to the two clamping jaws 41 of the expansion component 4. Figure 4 As shown, the first abutting surface 31 of the heating component 2 with a concave arc surface and the second abutting surface 213 of the pressure component 3 with a convex arc surface respectively abut against the outer side and the inner side of the winding structure 71, so as to press the winding structure 71. Figure 7 As shown, 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.

[0108] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, characterized in that: include: 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, characterized in that 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, characterized in that 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, characterized in that 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, characterized in that 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 claim 1, characterized in that 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 equipment according to claim 6, characterized in that 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, characterized in that 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 claim 6, characterized in that 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 claim 1, characterized in that 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 equipment according to claim 10, characterized in that 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, characterized in that: include: 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, characterized in that: 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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