Battery cell winding equipment

Abstract

The utility model discloses battery cell winding equipment, the battery cell winding equipment comprises a heating assembly and a winding assembly, the heating assembly comprises a first heating part and a second heating part, the first heating part is internally provided with a first heating channel, the first heating part is used for heating a first diaphragm, and the first diaphragm can move in the first heating channel; a second heating channel is formed in the second heating component, the second heating component is used for heating a second diaphragm, the second diaphragm can move in the second heating channel, and the winding assembly is used for sequentially stacking and winding the pole piece, the first diaphragm and the second diaphragm to form a winding core. According to the battery cell winding equipment disclosed by the utility model, a diaphragm at a corner can be heated, so that the diaphragm and a pole piece are uniformly adhered, the phenomenon that a battery cell is wrinkled is improved, and the quality of the battery cell is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and specifically relates to a battery core winding device. Background Art

[0002] With the continuous development of the new energy vehicle market, the demand for power batteries is also increasing. As an important link in the lithium battery manufacturing process, the technical level and production efficiency of power battery winding technology are of great significance to meeting market demand and improving corporate competitiveness.

[0003] The battery cell winding process processes the positive electrode sheet, separator and negative electrode sheet into a laminated sheet and winds them into a battery cell. The degree of adhesion between the separator and the electrode sheet after winding will seriously affect the quality of the battery cell. In the process of battery cell processing in related technologies, the electrode sheet and separator are generally directly hot-pressed and wound into shape. However, during the hot-pressing process, some parts of the separator are prone to uneven heating or no heating, which leads to reduced adhesion at the corners where the separator and the battery cell are combined, causing wrinkles in some areas of the battery cell, affecting the quality of the battery cell. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art to at least a certain extent. To this end, the embodiment of the utility model provides a battery cell winding device, which can make the diaphragm heat more evenly and ensure the adhesion between the diaphragm and the pole piece, thereby improving the wrinkling phenomenon of the battery cell and improving the quality of the battery cell.

[0005] The battery cell winding device of the embodiment of the utility model includes: a heating component, the heating component includes a first heating part and a second heating part, the first heating part has a first heating channel, the first heating part is used to heat the first diaphragm, and the first diaphragm is movable in the first heating channel, the second heating part has a second heating channel, the second heating part is used to heat the second diaphragm, and the second diaphragm is movable in the second heating channel; a winding component, the winding component is used to stack and wind the pole piece, the first diaphragm and the second diaphragm in sequence to form a winding core.

[0006] The battery cell winding equipment of the embodiment of the utility model heats the diaphragm by arranging a heating component, so that the diaphragm is heated more evenly, and the glue layer on the diaphragm reaches a molten state. The glue layer in the molten state can be better distributed on the diaphragm, thereby improving the adhesion of the diaphragm, that is, ensuring the adhesion between the diaphragm and the pole piece, and cooperating with the winding tension generated by the winding component, so that the pole piece and the glue layer on the diaphragm are more evenly bonded, thereby improving the wrinkling phenomenon of the battery cell corners.

[0007] In some embodiments, the first heating component and the second heating component are arranged at intervals in the thickness direction of the pole piece.

[0008] In some embodiments, the first heating component and the second heating component each include a first heating plate and a second heating plate, the first heating plate and the second heating plate are spaced apart in a thickness direction of the diaphragm to form a heating channel, and the spacing distance between the first heating plate and the second heating plate is adjustable.

[0009] In some embodiments, the first heating plate is a magnetic induction heating plate, and / or the second heating plate is a magnetic induction heating plate.

[0010] In some embodiments, the heating range of the first heating component is greater than or equal to 60°C, and / or the heating range of the second heating component is greater than or equal to 60°C.

[0011] In some embodiments, the winding assembly includes a winding needle and an auxiliary roller, the winding needle is used to wind the pole piece, the first diaphragm and the second diaphragm to form a winding core, the auxiliary roller is arranged on the periphery of the winding needle, and the auxiliary roller abuts against the outer peripheral surface of the winding core.

[0012] In some embodiments, in the radial direction of the winding core, the auxiliary roller may be close to or far away from the winding needle.

[0013] In some embodiments, there are multiple auxiliary rollers, and the multiple auxiliary rollers are arranged at intervals in the circumferential direction of the winding needle.

[0014] In some embodiments, the plurality of auxiliary rollers are symmetrically arranged in a radial direction of the winding needle.

[0015] In some embodiments, the winding tension of the coil with respect to the pole piece, the first diaphragm and the second diaphragm is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a battery cell winding device according to an embodiment of the utility model.

[0017] Figure 2 It is a schematic structural diagram of the first diaphragm of an embodiment of the utility model.

[0018] Reference numerals:

[0019] Heating assembly 100, winding assembly 200,

[0020] first heating component 1, first heating channel 11, first heating plate 12, second heating plate 13,

[0021] The second heating component 2, the second heating channel 21,

[0022] The first diaphragm 3 , the diaphragm base film 31 , the adhesive layer 32 , the second diaphragm 4 , the winding needle 5 , and the auxiliary roller 6 . DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0024] In the related art, during the cell rolling process, the diaphragm and the electrode are directly hot-pressed into shape. However, during the hot-pressing process, the corners of the diaphragm cannot be heated or are heated unevenly, and the glue layer at the corners of the diaphragm cannot melt, resulting in a decrease in the adhesion between the corners of the diaphragm and the electrode, resulting in wrinkles at the corners of the battery cell.

[0025] like Figure 1 and Figure 2 As shown, the battery cell winding device of the embodiment of the utility model includes a heating component 100 and a winding component 200. The heating component is used to heat the diaphragm, and the heated diaphragm and the pole piece are wound together to form a winding core through the winding component 200. The heating component 100 includes a first heating component 1 and a second heating component 2. The first heating component 1 has a first heating channel 11. The first heating component 1 is used to heat the first diaphragm 3, and the first diaphragm 3 is movable in the first heating channel 11. The second heating component 2 has a second heating channel 21. The second heating component 2 is used to heat the second diaphragm 4, and the second diaphragm 4 is movable in the second heating channel 21. The winding component 200 is used to stack and wind the pole piece, the first diaphragm 3 and the second diaphragm 4 in sequence to form a winding core.

[0026] Specifically, Figure 1 As shown, the first diaphragm 3 is inserted into the first heating channel 11, and tension is applied to the first diaphragm 3 by the winding assembly 200, so that the first diaphragm 3 moves in the first heating channel 11, and the first diaphragm 3 is wound on the winding assembly 200, the second diaphragm 4 is inserted into the second heating channel 21, and tension is applied to the second diaphragm 4 by the winding assembly 200, so that the second diaphragm 4 moves in the second heating channel 21, and the second diaphragm 4 is wound on the winding assembly 200, the pole piece is also connected to the winding assembly 200, moves driven by the winding assembly 200, and the pole piece is located between the first diaphragm 3 and the second diaphragm 4.

[0027] like Figure 2 As shown, the first diaphragm 3 and the second diaphragm 4 have the same structure and both include a diaphragm base film 31 and a glue layer 32 . The glue layer 32 is divided into an upper glue layer 32 and a lower glue layer 32 . The upper glue layer 32 and the lower glue layer 32 are distributed and smeared on the upper and lower ends of the diaphragm base film 31 .

[0028] The battery cell winding device of the embodiment of the utility model heats the diaphragm by arranging a heating component 100, so that the diaphragm is heated more evenly, and the glue layer 32 on the diaphragm reaches a molten state. The glue layer 32 in the molten state can be better distributed on the diaphragm, thereby improving the adhesion of the diaphragm, that is, ensuring the adhesion between the diaphragm and the pole piece, and cooperating with the winding tension generated by the winding component 200, so that the pole piece and the glue layer 32 on the diaphragm are more evenly bonded, thereby improving the wrinkling phenomenon of the battery cell corners and improving the quality of the core winding.

[0029] In some embodiments, the first heating component 1 and the second heating component 2 are arranged at intervals in the thickness direction of the pole piece.

[0030] Specifically, Figure 1 As shown, the first heating component 1 and the second heating component 2 are respectively arranged at the upper and lower ends of the electrode piece, the first heating component 1 heats the first diaphragm 3, and the second heating component 2 heats the second diaphragm 4. In other words, the first diaphragm 3 and the second diaphragm 4 are respectively arranged at the upper and lower ends of the electrode piece. The first heating component 1 and the second heating component 2 are used to heat the first diaphragm 3 and the second diaphragm 4 at the upper and lower ends of the electrode piece, which can not only improve the heating efficiency of the diaphragm, but also ensure the uniformity of the adhesion between the first diaphragm 3 and the second diaphragm 4 and the electrode piece.

[0031] In some embodiments, the first heating component 1 and the second heating component 2 both include a first heating plate 12 and a second heating plate 13, which are spaced apart in the thickness direction of the diaphragm to form a heating channel, and the spacing distance between the first heating plate 12 and the second heating plate 13 is adjustable.

[0032] Specifically, Figure 1 As shown, the first heating plate 12 and the second heating plate 13 are respectively arranged at the upper and lower ends of the diaphragm, and a heating channel is formed between the first heating plate 12 and the second heating plate 13. It should be noted that the first heating plate 12 and the second heating plate 13 in the first heating component 1 form a first heating channel 11, and the first heating plate 12 and the second heating plate 13 in the second heating component 2 form a second heating channel 21. The spacing distance between the first heating plate 12 and the second heating plate 13 can be increased or decreased, that is, the first heating plate 12 and the second heating plate 13 can be close to or far away from each other.

[0033] For example, the first heating plate 12 is a magnetic induction heating plate, and / or the second heating plate 13 is a magnetic induction heating plate.

[0034] It should be noted that when the distance between the first heating plate 12 and the second heating plate 13 decreases, the temperature of the first heating component 1 increases. Conversely, when the distance between the first heating plate 12 and the second heating plate 13 increases, the temperature of the first heating component 1 decreases.

[0035] In some embodiments, the heating range of the first heating component 1 is greater than or equal to 60°C, and / or the heating range of the second heating component 2 is greater than or equal to 60°C.

[0036] For example, the temperature of the first heating component 1 is 60°C, 70°C, 75°C, 80°C, and 90°C, and the temperature of the second heating component 2 is 60°C, 70°C, 75°C, 80°C, and 90°C. It should be noted that the temperatures of the first heating component 1 and the second heating component 2 can be the same or different.

[0037] In some embodiments, the winding assembly 200 includes a winding needle 5 and an auxiliary roller 6. The winding needle 5 is used to wind the pole piece, the first diaphragm 3 and the second diaphragm 4 to form a winding core. The auxiliary roller 6 is arranged on the periphery of the winding needle 5, and the auxiliary roller 6 abuts against the outer peripheral surface of the winding core.

[0038] Specifically, Figure 1 As shown, the axis of the winding needle 5 and the axis of the auxiliary roller 6 are arranged in parallel, the auxiliary roller 6 is located on the periphery of the winding needle 5, the auxiliary roller 6 abuts against the outer peripheral surface of the winding core, and the distance between the auxiliary roller 6 and the winding needle 5 can increase with the increase of the winding core diameter and decrease with the decrease of the winding core diameter. By providing the auxiliary roller 6, pressure can be applied to the winding core to ensure the uniformity and stability of the adhesion between the pole piece and the diaphragm.

[0039] In some embodiments, in the radial direction of the winding core, the auxiliary roller 6 is movable relative to the winding needle 5 to approach or move away from the winding needle 5 .

[0040] It should be noted that when the diameter of the winding core increases, the auxiliary roller 6 moves away from the winding needle 5. Conversely, when the diameter of the winding core decreases, the auxiliary roller 6 moves closer to the winding needle 5. When the winding of the winding core is completed, the auxiliary roller 6 can automatically leave the winding core, making it easy to remove the winding core.

[0041] In some embodiments, there are multiple auxiliary rollers 6 , and the multiple auxiliary rollers 6 are arranged at intervals in the circumferential direction of the winding needle 5 .

[0042] For example, the number of auxiliary rollers 6 may be two, and the two auxiliary rollers 6 are arranged at 180° intervals in the circumferential direction of the winding needle 5, or the number of auxiliary rollers 6 may be three, and the three auxiliary rollers 6 are arranged at 120° intervals in the circumferential direction of the winding needle 5, or the number of auxiliary rollers 6 may be four, and the four auxiliary rollers 6 are arranged at 90° intervals in the circumferential direction of the winding needle 5. By providing multiple auxiliary rollers 6, pressure can be applied to the winding core in multiple directions to ensure balanced force during the winding process of the winding core.

[0043] In some embodiments, the plurality of auxiliary rollers 6 are symmetrically arranged in the radial direction of the winding needle 5 .

[0044] For example, when there are two auxiliary rollers 6, the two auxiliary rollers 6 are symmetrically arranged in the left-right direction of the winding needle 5, or the two auxiliary rollers 6 are symmetrically arranged in the up-down direction of the winding needle 5. The auxiliary rollers 6 are symmetrically arranged in the radial direction of the winding needle 5 to ensure uniform pressure applied to the winding core, thereby improving uniform force during winding of the winding core and ensuring uniform adhesion between the pole piece and the diaphragm.

[0045] In some embodiments, the winding tension of the winding needle 5 on the pole piece, the first diaphragm 3 and the second diaphragm 4 is adjustable.

[0046] For example, the winding needle 5 adjusts the winding tension of the electrode sheet, the first diaphragm 3 and the second diaphragm 4 by controlling the rotation speed, or adjusts the winding tension of the electrode sheet and the diaphragm by adjusting the distance between the winding needle 5 and the electrode sheet unwinding mechanism or the diaphragm unwinding mechanism. It should be noted that the winding tension of the electrode sheet, the first diaphragm 3 and the second diaphragm 4 can be adjusted by the winding needle 5, which is common knowledge in the art and will not be elaborated here.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A battery cell winding device, characterized in that: include: A heating assembly, the heating assembly comprising a first heating component and a second heating component, the first heating component having a first heating channel therein, the first heating component being used to heat a first diaphragm, and the first diaphragm being movable within the first heating channel, the second heating component having a second heating channel therein, the second heating component being used to heat a second diaphragm, and the second diaphragm being movable within the second heating channel; A winding assembly is used to stack and wind the pole piece, the first diaphragm and the second diaphragm in sequence to form a winding core.

2. The battery cell winding device according to claim 1, characterized in that: The first heating component and the second heating component are arranged with a gap in the thickness direction of the pole piece.

3. The battery cell winding device according to claim 2, characterized in that: The first heating component and the second heating component each include a first heating plate and a second heating plate, the first heating plate and the second heating plate are spaced apart in a thickness direction of the diaphragm to form a heating channel, and the spacing distance between the first heating plate and the second heating plate is adjustable.

4. The battery cell winding device according to claim 3, characterized in that: The first heating plate is a magnetic induction heating plate, and / or the second heating plate is a magnetic induction heating plate.

5. The battery cell winding device according to any one of claims 1 to 4, characterized in that: The heating range of the first heating component is greater than or equal to 60°C, and / or the heating range of the second heating component is greater than or equal to 60°C.

6. The battery cell winding device according to claim 1, characterized in that: The winding assembly includes a winding needle and an auxiliary roller. The winding needle is used to wind the pole piece, the first diaphragm and the second diaphragm to form a winding core. The auxiliary roller is arranged on the periphery of the winding needle and abuts against the outer peripheral surface of the winding core.

7. The battery cell winding device according to claim 6, characterized in that: In the radial direction of the winding core, the auxiliary roller may be close to or far away from the winding needle.

8. The battery cell winding device according to claim 6, characterized in that: There are multiple auxiliary rollers, and the multiple auxiliary rollers are arranged at intervals in the circumferential direction of the winding needle.

9. The battery cell winding device according to claim 8, characterized in that: The plurality of auxiliary rollers are symmetrically arranged in a radial direction of the winding needle.

10. The battery cell winding device according to any one of claims 6 to 9, characterized in that: The winding tension of the winding pin for the pole piece, the first diaphragm and the second diaphragm is adjustable.

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