Battery cell winding device and secondary battery production line

Abstract

The utility model relates to a battery cell winding device and a secondary battery production line, and the device comprises a winding needle which is used for winding a pole piece to form a battery cell; the dislocation adjusting assembly comprises a pressing roller, a brake disc and a brake mechanism, and the brake disc is in a disc shape and is configured to rotate along with the pressing roller; when the tab dislocation amount of the battery cell is greater than a threshold value, the brake mechanism is configured to apply a braking force to at least one side of the brake disc to brake the brake disc, and the brake disc is used for driving the compression roller to be braked and the compression roller abuts against the battery cell, so that the tab dislocation amount is reduced by adjusting the winding tightness degree of the battery cell. According to the battery cell winding device and the secondary battery production line, the dislocation adjustment effect can be effectively improved, the dislocation quantity of the battery cell tabs can be improved, and the dislocation adjustment time can be shortened.

Description

Technical Field

[0001] The present application relates to the technical field of battery manufacturing, and particularly to a core winding device and a secondary battery production line. Background Art

[0002] A core winding device is a device used to wind a strip-shaped electrode sheet around a winding needle to form a core. A plurality of tabs are arranged at intervals along the length direction of the electrode sheet according to a certain rule. In an ideal state, when the electrode sheet is wound around the winding needle, along the radial direction of the winding needle, the plurality of tabs should be exactly aligned.

[0003] However, due to various reasons such as insufficient equipment accuracy and tab size deviation, when the electrode sheet is wound around the winding needle, the tabs may be misaligned with each other, resulting in a high misalignment amount of the tabs and affecting the performance of the core. In the related art, a pressing roller is used to rub the core, so that the misaligned tabs move in the opposite direction of the misalignment to reduce the misalignment amount of the tabs. However, in actual use, the rubbing correction effect is still not good, and the misalignment amount of the core tabs cannot be effectively improved. Summary of the Utility Model

[0004] In view of the above problems, embodiments of the present application provide a core winding device and a secondary battery production line, which can effectively improve the misalignment adjustment effect, improve the misalignment amount of the core tabs, and reduce the misalignment adjustment time.

[0005] In a first aspect, an embodiment of the present application provides a core winding device, including: a winding needle for winding an electrode sheet to form a core; and a misalignment adjustment assembly including a pressing roller, a brake disc, and a braking mechanism. The brake disc is disc-shaped and is configured to rotate following the pressing roller. When the misalignment amount of the tabs of the core is greater than a threshold value, the braking mechanism is configured to apply a braking force to at least one side of the brake disc to brake the brake disc, and the brake disc is used to drive the pressing roller to be braked and the pressing roller presses against the core, so as to reduce the misalignment amount of the tabs by adjusting the winding tightness of the core.

[0006] When the misalignment amount of the tabs of the core is greater than a threshold value, the pressing roller presses against the core, and the braking mechanism applies a braking force to the brake disc that rotates following the pressing roller, so that the brake disc drives the pressing roller to be braked to stop or decelerate. Compared with using a freely rotating pressing roller to rub the core, using a braked pressing roller to press against the core can hinder the movement of the electrode segment in contact with the pressing roller of the core, so that the electrode segment at the center of the core and the electrode segment pressed by the pressing roller generate relative movement, and then reduce the misalignment amount of the tabs by adjusting the winding tightness of the core, effectively improving the misalignment adjustment effect, improving the misalignment amount of the core tabs, and reducing the misalignment adjustment time.

[0007] In some embodiments, when the misalignment amount of the tab of the battery cell in the first direction is greater than a threshold value, the winding needle is further configured to rotate in the first direction, where the first direction is opposite to the second direction, and the second direction is the direction in which the winding needle winds the electrode sheet.

[0008] When the misalignment amount of the tab of the battery cell in the first direction is greater than a threshold value, setting the winding needle to rotate in a direction opposite to the direction of winding the electrode sheet can cause the electrode segment at the pressing position of the pressing roller to have a relative movement opposite to the first direction with respect to the electrode segment at the center of the battery cell, thereby reducing the misalignment amount of the tab in the first direction.

[0009] In some embodiments, when the misalignment amount of the tab of the battery cell in the second direction is greater than a threshold value, the winding needle is further configured to rotate in the second direction, where the second direction is the direction in which the winding needle winds the electrode sheet.

[0010] When the misalignment amount of the tab of the battery cell in the second direction is greater than a threshold value, setting the winding needle to rotate in the direction of winding the electrode sheet can cause the electrode segment at the pressing position of the pressing roller to have a relative movement opposite to the second direction with respect to the electrode segment at the center of the battery cell, thereby reducing the misalignment amount of the tab in the second direction.

[0011] In some embodiments, the brake disc is coaxially arranged with the pressing roller.

[0012] By coaxially arranging the brake disc with the pressing roller, the brake disc can follow the pressing roller to rotate synchronously, and when the brake disc is braked, the brake disc can drive the pressing roller to be braked synchronously.

[0013] In some embodiments, the brake disc is arranged on the journal of the pressing roller.

[0014] By arranging the brake disc on the journal of the pressing roller, the position where the pressing roller presses the battery cell and the position where the brake disc is arranged are reasonably arranged, so that the pressing roller can not only press the battery cell but also be braked under the drive of the brake disc with a simple and compact structure.

[0015] In some embodiments, the brake disc is connected to the journal by a key.

[0016] By connecting the brake disc to the journal by a key, it can be ensured that the brake disc is firmly connected to the journal of the pressing roller, so that the braking force applied to the brake disc can be effectively transmitted to the pressing roller.

[0017] In some embodiments, the braking mechanism includes a driver and a brake block, and the brake block is detachably connected to the driver.

[0018] Setting the braking mechanism to include a driver and a brake block, the driver can apply a braking force to the brake disc through the brake block. Setting the brake block to be detachably connected to the driver can facilitate the replacement of the brake block after it wears out.

[0019] In some embodiments, the misalignment adjustment assembly further includes a bracket. The pressing roller is disposed on the bracket. The bracket is provided with a kidney-shaped hole, and the braking mechanism is connected to the kidney-shaped hole. The length direction of the kidney-shaped hole is parallel to the axial direction of the pressing roller.

[0020] By arranging the braking mechanism to be connected to the kidney-shaped hole on the bracket, with the length direction of the kidney-shaped hole parallel to the axial direction of the pressing roller and the pressing roller disposed on the bracket, the braking mechanism can adjust its installation position in the direction parallel to the axial direction of the pressing roller, so as to adjust the relative position between the braking mechanism and the brake disc to reduce eccentric braking.

[0021] In some embodiments, the pressing roller includes a main body portion and journal heads located at both ends of the main body portion. The main body portion includes a cylinder and a wear-resistant layer sleeved on the cylinder.

[0022] By arranging the main body portion of the pressing roller to include a cylinder, the inertia of the rotation of the pressing roller can be reduced, which is convenient for the braking mechanism to apply a braking force to the brake disc to drive the pressing roller to be braked. By arranging the main body portion of the pressing roller to include a wear-resistant layer sleeved on the cylinder, the friction force between the pressing roller and the electrode segment of the battery cell being pressed can be increased when the pressing roller presses the battery cell, enhancing the effect of hindering the movement of the electrode segment of the battery cell being pressed. At the same time, the wear-resistant layer can be replaced separately after wear to improve the service life of the pressing roller.

[0023] In a second aspect, an embodiment of the present application provides a secondary battery production line, including the battery cell winding device according to any one of the above embodiments.

[0024] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0026] Figure 1 (a) is a schematic structural diagram in which a plurality of tab ears are aligned with each other, (b) is a first schematic structural diagram in which a plurality of tab ears are misaligned with each other, and (c) is a second schematic structural diagram in which a plurality of tab ears are misaligned with each other;

[0027] Figure 2 is a schematic structural diagram of the battery cell winding device when the misalignment amount of the tab ears of the battery cell in some embodiments of the present application along the first direction is greater than the threshold value;

[0028] Figure 3It is a schematic structural diagram of a battery core winding device when the misalignment amount of the tabs of the battery core in some embodiments of the present application in the second direction is greater than the threshold value;

[0029] Figure 4 It is a schematic structural diagram of a misalignment adjustment component in some embodiments of the present application;

[0030] Figure 5 It is an exploded schematic diagram of a misalignment adjustment component in some embodiments of the present application;

[0031] Figure 6 It is a top view of a misalignment adjustment component in some embodiments of the present application;

[0032] Figure 7 is Figure 6 a sectional view of the misalignment adjustment component along the A-A direction in

[0033] The reference numerals in the accompanying drawings in the specific embodiments are as follows:

[0034] 100, misalignment adjustment component; 200, winding needle; 300, battery core; 310, tab; 311, positive tab; 312, negative tab; 10, bracket; 11, first bearing seat; 12, second bearing seat; 111, first bearing installation position; 112, first bearing installation seat; 113, first bearing; 121, second bearing installation position; 122, second bearing installation seat; 123, second bearing; 14, bearing cover; 17, kidney-shaped hole; 20, pressure roller; 21, journal; 22, main body part; 23, cylinder; 24, wear-resistant layer; 30, brake disc; 31, shaft end cover; 32, shaft sleeve; 33, key; 40, braking mechanism; 41, driver; 42, mounting sleeve; 43, brake block; 44, fixing structure. Specific embodiments

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0037] Reference to "embodiment" in this application means that a specific feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "joined", 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] The term "and / or" in this application is merely 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 simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0040] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only illustrative and should not constitute any limitation to this application.

[0041] The "plurality" mentioned in this application refers to two or more (including two).

[0042] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0043] In the process of battery production and manufacturing, winding can be used for the production of square and circular batteries. During the winding process, a core winding device can be used to wind the positive and negative electrode plates and the separator into a cylindrical or square battery core in sequence. The state of the tabs of the battery core has a relatively important impact on the product quality of the battery core. Tab misalignment is a common tab defect state, which occurs during the production and manufacturing process of the battery. Due to various reasons such as insufficient equipment accuracy and tab size deviation, the tabs are misaligned with each other when the electrode plate is wound on the winding needle.

[0044] For example, referring to Figure 1 (a)-1(c), Figure 1 (a) is a schematic structural diagram in which multiple tabs are aligned with each other, Figure 1 (b) is a first schematic structural diagram in which multiple tabs are misaligned with each other, Figure 1 (c) is a second schematic structural diagram in which multiple tabs are misaligned with each other.

[0045] For the convenience of description, it is defined that Figure 1 the width direction of the battery core 300 shown is the X-axis direction, the thickness direction of the battery core 300 is the Z-axis direction, and the X-axis direction and the Z-axis direction are perpendicular. As Figure 1 (a) shows, for the battery core 300 wound by the core winding device qualified, its multiple tabs 310 are stacked along its thickness direction (Z-axis direction), and the multiple tabs 310 include a positive tab 311 and a negative tab 312, and the positive tab 311 and the negative tab 312 are arranged at intervals. The positive tabs 311 (or negative tabs 312) are aligned with each other in the width direction (X-axis direction) of the battery core 300, or the tab misalignment amount of the positive tabs 311 (or negative tabs 312) along the width direction (X-axis direction) of the battery core 300 is within the allowable range of the process standard, which does not affect the subsequent assembly and use of the battery core 300.

[0046] During the winding process of the battery core 300, due to the thickness fluctuation of the electrode plate and the rotational speed fluctuation of the winding needle, it is easier for multiple tabs of the same polarity to be misaligned, especially for co-directional misalignment. Co-directional misalignment means that multiple tabs of the same polarity have a deviation with the same trend in the width direction (X-axis direction) of the battery core 300, which can be divided into clockwise misalignment and counterclockwise misalignment.

[0047] Taking the positive electrode tab 311 as an example, when the positive electrode tab 311 of the battery cell 300 is misaligned in the clockwise direction, it means that during the winding process, each positive electrode tab 311 of the battery cell 300 is misaligned clockwise relative to the previous wound positive electrode tab 311. After removing the battery cell 300 with the positive electrode tab 311 misaligned in the clockwise direction, it is as shown in Figure 1 (b). Each positive electrode tab 311 on the battery cell 300 deviates to the right (positive X-axis direction) from the previous wound positive electrode tab 311. Since the positive electrode plate and the negative electrode plate are wound simultaneously, when the positive electrode tab 311 is misaligned in the clockwise direction, the negative electrode tab 312 will also be misaligned in the clockwise direction synchronously.

[0048] Taking the positive electrode tab 311 as an example, when the positive electrode tab 311 of the battery cell 300 is misaligned in the counterclockwise direction, it means that during the winding process, each positive electrode tab 311 of the battery cell 300 is misaligned counterclockwise relative to the previous wound positive electrode tab 311. After removing the battery cell 300 with the positive electrode tab 311 misaligned in the counterclockwise direction, it is as shown in Figure 1 (c). Each positive electrode tab 311 on the battery cell 300 deviates to the left (negative X-axis direction) from the previous wound positive electrode tab 311. Since the positive electrode plate and the negative electrode plate are wound simultaneously, when the positive electrode tab 311 is misaligned in the counterclockwise direction, the negative electrode tab 312 will also be misaligned in the counterclockwise direction synchronously.

[0049] In the related art, to solve the problem of tab misalignment, the battery cell winding device uses a correction mechanism opposite to the winding needle at an interval. When it is detected that the misalignment amount of the tab of the battery cell is greater than a preset threshold, the pressing roller of the correction mechanism kneads the battery cell, so that the misaligned tab moves in the opposite direction of the misalignment to reduce the misalignment amount of the tab. However, in actual use, the pressing roller in the related art is in a free state, and there is a problem that the kneading and correction effect of the free pressing roller is not good, and this correction mechanism cannot meet the improvement of the winding tab misalignment.

[0050] In view of this, the embodiments of the present application provide a battery cell winding device and a secondary battery production line. By providing that the battery cell winding device includes a winding needle for winding the electrode plates to form a battery cell and a misalignment adjustment component. The misalignment adjustment component includes a pressing roller, a brake disc and a braking mechanism, and the brake disc is configured to rotate following the pressing roller. When the misalignment amount of the tab of the battery cell is greater than the threshold, the braking mechanism is configured to apply a braking force to at least one side of the brake disc to brake the brake disc, and the brake disc is used to drive the pressing roller to be braked and the pressing roller presses against the battery cell, so as to reduce the misalignment amount of the tab by adjusting the winding tightness of the battery cell.

[0051] When the misalignment amount of the tab of the battery cell is greater than the threshold value, press the battery cell with a pressure roller, and apply a braking force to the brake disc that rotates following the pressure roller through a braking mechanism, so that the brake disc drives the pressure roller to be braked to stop or decelerate. Compared with kneading the battery cell with a freely rotating pressure roller, pressing the battery cell with a braked pressure roller can hinder the movement of the tab segment in contact with the pressure roller of the battery cell, causing relative movement between the tab segment at the center of the battery cell and the tab segment pressed by the pressure roller. Furthermore, by adjusting the winding tightness of the battery cell, the misalignment amount of the tab can be reduced, effectively improving the misalignment adjustment effect, improving the misalignment amount of the tab of the battery cell, and reducing the misalignment adjustment time.

[0052] The electrode tab is a sheet-like object made by coating an active slurry and other coatings on a current collector, and can be divided into a positive electrode tab and a negative electrode tab.

[0053] The battery cell winding device is a special device for winding components such as positive electrode tabs, negative electrode tabs, and separators with matching sizes after slitting into a battery cell by precisely controlling factors such as speed, tension, size, and deviation.

[0054] The battery cell is a product made by winding components such as positive electrode tabs, negative electrode tabs, and separators with a battery cell winding device.

[0055] The winding needle is a device component with a cylindrical or flat structure used to tightly wind positive electrode tabs, negative electrode tabs, and separators into a battery cell in a certain order.

[0056] The misalignment adjustment component is a mechanical component that can effectively adjust the misalignment amount of the tab when the misalignment amount of the tab of the battery cell is greater than the threshold value during the battery cell winding process.

[0057] The pressure roller is a device that realizes functions such as pressing and leveling by applying pressure to an object.

[0058] The brake disc is a friction component with a generally disc shape.

[0059] The braking mechanism is a mechanism that generates a braking force to hinder the movement or movement tendency of an object in a certain way (such as friction, hydraulic pressure, etc.).

[0060] The braking force is a force that decelerates or stops a moving object, and prevents a stationary object from moving.

[0061] Braking is an action that causes an object to stop or decelerate.

[0062] The misalignment amount of the tab is the position offset amount of the tab of the battery cell during the battery cell winding process. The position offset amount can be determined by measuring the relative position of the tab and other parts of the battery cell (such as the central axis of the battery cell) through a detection mechanism such as a visual detection component or an optical detection component.

[0063] The core winding device and the secondary battery production line according to the embodiments of the present application can be but are not limited to being used in the production and manufacturing of batteries for vehicles, energy storage, ships, aircraft, etc.

[0064] Please refer to Figure 2 In a first aspect, the embodiments of the present application provide a core winding device, including a winding needle 200 and a misalignment adjustment assembly 100. The winding needle 200 is used for winding the electrode sheet to form a core 300. The misalignment adjustment assembly 100 includes a pressure roller 20, a brake disc 30, and a braking mechanism 40.

[0065] The brake disc 30 is disc-shaped and is configured to rotate following the pressure roller 20. Exemplarily, the outer contour of the disc-shaped brake disc 30 can be either circular or approximately circular. In some embodiments, the brake disc 30 is coaxially arranged with the pressure roller 20, and the pressure roller 20 drives the brake disc 30 to rotate synchronously; in other embodiments, the brake disc 30 is non-coaxially arranged with the pressure roller 20, and the pressure roller 20 drives the brake disc 30 to move through a transmission structure (such as gear transmission, etc.).

[0066] Optionally, the braking mechanism 40 can include a pneumatic gripper, an electric gripper, a hydraulic gripper, etc.

[0067] Optionally, the pressure roller 20 and the braking mechanism 40 can be arranged on the same bracket 10; the pressure roller 20 and the braking mechanism 40 can be arranged on different brackets 10 (not shown).

[0068] When the misalignment amount of the tab of the core 300 is greater than the threshold value, the braking mechanism 40 is configured to apply a braking force to at least one side of the brake disc 30 to brake the brake disc 30. When the brake disc 30 is braked by the braking mechanism 40, the brake disc 30 is stationary or moves at a reduced speed. The brake disc 30 is used to drive the pressure roller 20 to be braked and the pressure roller 20 presses against the core 300, so as to reduce the misalignment amount of the tab by adjusting the winding tightness of the core 300.

[0069] Optionally, the misalignment amount of the tab of the core 300 can be collected by a detection mechanism such as a visual detection component or an optical detection component.

[0070] Optionally, the braking mechanism 40 can be configured to apply a braking force to one side of the brake disc 30 to brake the brake disc 30; the braking mechanism 40 can also be configured to apply a braking force to both sides of the brake disc 30 to brake the brake disc 30.

[0071] Optionally, when the misalignment amount of the tab of the core 300 is less than or equal to the threshold value, the pressure roller 20 is away from the core 300. When the detection mechanism detects that the misalignment amount of the tab of the core 300 is greater than the threshold value, the control device (for example, it can be a programmable logic controller) controls the drive mechanism to drive the pressure roller 20 to approach the core 300 and press against the core 300.

[0072] Optionally, the threshold value can be preset or can be adaptively adjusted during the winding process of the battery cell 300.

[0073] In the above embodiment, when the misalignment amount of the tab of the battery cell 300 is greater than the threshold value, the pressing roller 20 presses against the battery cell 300, and the braking mechanism 40 applies a braking force to the brake disc 30 that rotates following the pressing roller 20, so that the brake disc 30 drives the pressing roller 20 to be braked to be stationary or decelerated. Compared with kneading the battery cell 300 by using the freely rotating pressing roller 20, pressing against the battery cell 300 by using the braked pressing roller 20 can hinder the movement of the tab segment in contact with the pressing roller 20 of the battery cell 300, so that the tab segment at the center of the battery cell 300 and the tab segment at the position pressed by the pressing roller 20 generate relative movement, and further reduce the misalignment amount of the tab by adjusting the winding tightness of the battery cell 300, effectively improving the misalignment adjustment effect, improving the misalignment amount of the battery cell tab, and reducing the misalignment adjustment time.

[0074] In some embodiments, when the misalignment amount of the tab 310 of the battery cell 300 in the first direction is greater than the threshold value, the winding needle 200 is further configured to rotate in the first direction. Wherein, the first direction is opposite to the second direction, and the second direction is the direction when the winding needle 200 winds the electrode sheet.

[0075] Exemplarily, the first direction can be the counterclockwise direction, and the second direction can be the clockwise direction; the first direction can also be the clockwise direction, and the second direction can also be the counterclockwise direction.

[0076] Reference Figure 2 , here, an example is given with the first direction being the counterclockwise direction. The winding needle 200 winds the electrode sheet in the clockwise direction to form the battery cell 300 when winding the electrode sheet. When the misalignment amount of the tab of the battery cell 300 in the counterclockwise direction is greater than the threshold value, the winding needle 200 is further configured to rotate in the counterclockwise direction, that is, rotate in the direction opposite to the direction in which the winding needle 200 winds the electrode sheet. The battery cell 300 rotates counterclockwise following the winding needle 200, the pressing roller 20 presses against the battery cell 300, and the pressing roller 20 is driven to have a tendency to rotate clockwise. The braking mechanism 40 drives the pressing roller 20 to be braked to be stationary or decelerated through the brake disc 30, so as to apply a frictional force that hinders the counterclockwise rotation of the tab segment at the position where the battery cell 300 is pressed. Thereby, a rotational speed difference appears between the tab segment at the center of the battery cell 300 connected to the winding needle 200 and the tab segment of the battery cell 300 pressed by the pressing roller 20, so as to generate relative movement, and further reduce the misalignment amount in the counterclockwise direction by adjusting the winding tightness of the battery cell 300.

[0077] In the above embodiments, when the misalignment amount of the tab of the battery cell 300 in the first direction is greater than the threshold value, it is set that the winding needle 200 rotates in the direction opposite to the direction of winding the electrode sheet, so that the electrode segment at the position pressed by the pressing roller 20 generates a relative movement opposite to the first direction with respect to the electrode segment at the center of the battery cell 300, thereby reducing the misalignment amount of the tab in the first direction.

[0078] In some embodiments, when the misalignment amount of the tab 310 of the battery cell 300 in the second direction is greater than the threshold value, the winding needle 200 is further configured to rotate in the second direction. Wherein, the second direction is the direction when the winding needle 200 winds the electrode sheet.

[0079] Exemplarily, the second direction may be the counterclockwise direction, and the second direction may also be the clockwise direction.

[0080] Reference Figure 3 , here, an example is given with the second direction being the clockwise direction. The winding needle 200 winds the electrode sheet in the clockwise direction to form the battery cell 300 when winding the electrode sheet. When the misalignment amount of the tab of the battery cell 300 in the clockwise direction is greater than the threshold value, the winding needle 200 is further configured to rotate in the clockwise direction, that is, continue to rotate in the direction of winding the electrode sheet by the winding needle 200. The battery cell 300 rotates clockwise following the winding needle 200, and the pressing roller 20 presses the battery cell 300, and the pressing roller 20 is driven to have a tendency to rotate counterclockwise. The braking mechanism 40 drives the pressing roller 20 to be braked to be stationary or decelerated through the brake disc 30, so as to apply a frictional force that hinders the clockwise rotation of the electrode segment at the position where the battery cell 300 is pressed. Thus, a rotational speed difference appears between the electrode segment at the center where the battery cell 300 is connected to the winding needle 200 and the electrode segment where the battery cell 300 is pressed by the pressing roller 20, thereby generating a relative movement, and further reducing the misalignment amount in the counterclockwise direction by adjusting the winding tightness of the battery cell 300.

[0081] In the above embodiments, when the misalignment amount of the tab 310 of the battery cell 300 in the second direction is greater than the threshold value, it is set that the winding needle 200 rotates in the direction of winding the electrode sheet, so that the electrode segment at the position pressed by the pressing roller 20 generates a relative movement opposite to the second direction with respect to the electrode segment at the center of the battery cell 300, thereby reducing the misalignment amount of the tab 310 in the second direction.

[0082] Reference Figures 4 - 7 , in some embodiments, the brake disc 30 and the pressing roller 20 are coaxially arranged.

[0083] The journal refers to a section of the shaft with the same diameter or a cylindrical surface with an uneven diameter but a uniform and continuous outer circular surface. The journal is generally the place on the shaft where the bearing is installed.

[0084] The coaxial arrangement can ensure a stable connection between the brake disc 30 and the pressure roller 20, reducing uneven friction and vibration caused by misalignment or offset. By arranging the brake disc 30 and the pressure roller 20 coaxially, the brake disc 30 can rotate synchronously with the pressure roller 20, and when the brake disc 30 is braked, the brake disc 30 can drive the pressure roller 20 to be braked synchronously.

[0085] In some embodiments, the brake disc 30 is arranged on the journal 21 of the pressure roller 20.

[0086] Optionally, the brake disc 30 can be arranged on the journal 21 at one end of the pressure roller 20, and the braking mechanism 40 is arranged opposite to the brake disc 30; the journals 21 at both ends of the pressure roller 20 can be respectively provided with brake discs 30, and two braking mechanisms 40 are respectively arranged opposite to the two brake discs 30.

[0087] By arranging the brake disc 30 on the journal 21 of the pressure roller 20, the position where the pressure roller 20 presses against the battery core 300 and the position where the brake disc 30 is arranged are reasonably arranged. With a simple and compact structure, the pressure roller 20 can not only press against the battery core 300, but also be braked to stop or decelerate under the drive of the brake disc 30, reducing the occupation of extra space.

[0088] In some embodiments, the brake disc 30 is connected to the journal 21 by a key 33.

[0089] A key refers to a component used for circumferential fixation between a shaft and a component on the shaft to transmit torque.

[0090] The connection of the key 33 can ensure the circumferential fixation between the brake disc 30 and the journal 21. At the same time, through the connection of the key 33, the torque on the shaft of the pressure roller 20 can be effectively transmitted to the brake disc 30. During braking, the brake disc 30 transmits the braking force to the pressure roller 20 through the connection of the key 33, so that the pressure roller 20 is braked to stop or decelerate.

[0091] Optionally, referring to Figure 7 , the journal 21 of the pressure roller 20 has a recess for accommodating the key 33. Correspondingly, the brake disc 30 is also provided with a corresponding recess for accommodating the key 33.

[0092] Optionally, the brake disc 30 and the journal 21 can be connected by one key 33, or the brake disc 30 and the journal 21 can also be connected by multiple keys 33.

[0093] Optionally, the misalignment adjustment assembly 100 further includes an end cap 31 and a bushing 32. The bushing 32 is sleeved on the outer periphery of the journal 21 of the pressure roller 20. The end cap 31 is connected to the end of the journal 21 by screws. The brake disc 30 is sleeved on the outer periphery of the journal 21 and is arranged between the end cap 31 and the bushing 32 to realize the axial positioning of the brake disc 30 on the pressure roller 20.

[0094] In the above embodiments, the brake disc 30 and the journal 21 are connected by a key 33, which can ensure the stable connection between the brake disc 30 and the journal 21 of the pressure roller 20, so that the braking force applied to the brake disc 30 can be effectively transmitted to the pressure roller 20.

[0095] In some embodiments, the braking mechanism 40 includes a driver 41 and a brake block 43, and the brake block 43 is detachably connected to the driver 41.

[0096] A driver is a component that provides power to maintain motion or reverse the mechanical direction in a mechanical device, and can provide sufficient power and torque for the mechanical equipment so that the machine can work properly.

[0097] A brake block is a block-shaped part made of a friction material for direct contact with the brake disc.

[0098] Optionally, the driver 41 can be a driving component such as a cylinder, a hydraulic cylinder or a motor.

[0099] The braking mechanism 40 is provided with a driver 41 and a brake block 43. The driver 41 can apply a braking force to the brake disc 30 through the brake block 43. The brake block 43 is detachably connected to the driver 41, which facilitates the replacement of the brake block 43 after it is worn.

[0100] Optionally, the braking mechanism 40 further includes a mounting sleeve 42 and a fixing structure 44. The brake block 43 is detachably connected to the driver 41 by cooperating with the mounting sleeve 42 and the fixing structure 44.

[0101] Optionally, there are a pair of brake blocks 43, and the pair of brake blocks 43 are respectively located on both sides of the brake disc 30 so that the braking mechanism 40 can apply braking forces to both sides of the brake disc 30, making the braking force more uniform and the eccentricity smaller.

[0102] Exemplarily, the detachable connection can be a threaded connection, a snap connection, a pin connection, a bayonet connection, etc.

[0103] In some embodiments, the battery cell winding device further includes a bracket 10, the pressure roller 20 is arranged on the bracket 10, and a kidney-shaped hole 17 is arranged on the bracket 10. The braking mechanism 40 is connected to the kidney-shaped hole 17, and the length direction of the kidney-shaped hole 17 is parallel to the axial direction of the pressure roller 20.

[0104] A bracket is a commonly used mechanical component for supporting and fixing objects.

[0105] A kidney-shaped hole is a special hole shape, including two parallel straight segments and two semi-circular arc segments, where the straight segment represents the major axis of the kidney-shaped hole, and the semi-circular arc segments represent both ends of the kidney-shaped hole.

[0106] Optionally, a single kidney-shaped hole 17 may be provided on the bracket 10 for connection to the braking mechanism 40, or multiple kidney-shaped holes 17 may be provided on the bracket 10 for connection to the braking mechanism 40.

[0107] By providing the braking mechanism 40 to be connected to the kidney-shaped hole 17 on the bracket 10, with the length direction of the kidney-shaped hole 17 parallel to the axial direction of the pressure roller 20, the braking mechanism 40 can adjust its installation position in the direction parallel to the axial direction of the pressure roller 20, thereby adjusting the relative position between the braking mechanism 40 and the brake disc 30 to reduce eccentric braking.

[0108] In some embodiments, the bracket 10 includes a first bearing seat 11 and a second bearing seat 12. The journal shafts 21 at both ends of the pressure roller 20 are respectively connected to the first bearing seat 11 and the second bearing seat 12.

[0109] Optionally, the first bearing seat 11 includes a first bearing installation position 111 and a first bearing installation seat 112, and the first bearing installation position 111 and the first bearing installation seat 112 are fixedly connected by bolts. The second bearing seat 12 includes a second bearing installation position 121 and a second bearing installation seat 122, and the second bearing installation position 121 and the second bearing installation seat 122 are fixedly connected by bolts.

[0110] Optionally, the first bearing 113 and the second bearing 123 are respectively sleeved on the journal shafts 21 at both ends of the pressure roller 20. The journal shaft 21 of the pressure roller 20 is installed on the first bearing seat 11 through the first bearing 113, and the other journal shaft 21 of the pressure roller 20 is installed on the second bearing seat 12 through the second bearing 123.

[0111] Optionally, the bracket 10 further includes bearing covers 14. The two bearing covers 14 are respectively sleeved on the outer periphery of the journal shafts 21 and respectively cover the first bearing seat 11 and the second bearing seat 12. The bearing covers 14 can protect the bearings, prevent dust, water or other impurities from entering the interior of the bearings, thereby ensuring that the bearings operate in a clean environment and extending their service life.

[0112] In the above embodiments, by connecting the journal shafts 21 at both ends of the pressure roller 20 to the first bearing seat 11 and the second bearing seat 12 of the bracket 10, the eccentric rotation of the pressure roller 20 can be reduced, and at the same time, the connection is reliable, the structure is simple, and the space occupation is small.

[0113] In some embodiments, the pressure roller 20 includes a main body portion 22 and journal shafts 21 located at both ends of the main body portion 22, and the main body portion 22 includes a cylinder body 23 and a wear-resistant layer 24 sleeved on the cylinder body 23.

[0114] Optionally, the material of the journal shaft 21 is stainless steel. Using stainless steel as the material of the journal shaft 21 can improve the service life of the pressure roller 20 and facilitate the installation of the brake disc 30 at the journal shaft 21.

[0115] Optionally, the material of the cylinder body 23 is aluminum. The cylinder body 23 made of aluminum can reduce the weight of the pressure roller 20 and decrease the inertia of the rotation of the pressure roller 20.

[0116] Optionally, the material of the wear-resistant layer 24 is polyurethane. Polyurethane has appropriate hardness and can provide flexible buffering at the same time. It can improve the effect of tab misalignment adjustment of the pressure roller 20 and reduce the damage to the battery core 300 when the pressure roller 20 presses against the battery core 300.

[0117] In the above embodiment, by setting the main body portion 22 of the pressure roller 20 to include the cylinder body 23, the inertia of the rotation of the pressure roller 20 can be reduced, which is convenient for the braking mechanism 40 to apply a braking force to the brake disc 30 to brake the driven pressure roller 20. Setting the main body portion 22 of the pressure roller 20 to include the wear-resistant layer 24 sleeved on the cylinder body 23 can increase the friction force between the pressure roller 20 and the tab segment of the battery core 300 pressed when the pressure roller 20 presses against the battery core 300, enhance the effect of hindering the movement of the tab segment of the battery core 300 being pressed, and at the same time, the wear-resistant layer 24 can be replaced separately after wear to improve the service life of the pressure roller 20.

[0118] In a second aspect, an embodiment of the present application further provides a secondary battery production line, which is characterized by including the battery core winding device according to any one of the above embodiments.

[0119] Refer to the appendix again Figures 2 - 7 , according to some embodiments of the present application, a battery core winding device is provided, including a winding needle 200 and a misalignment adjustment assembly 100. The winding needle 200 is used for winding electrode tabs to form a battery core 300. The misalignment adjustment assembly 100 includes a pressure roller 20, a brake disc 30, and a braking mechanism 40. The brake disc 30 is disc-shaped and is configured to rotate following the pressure roller 20.

[0120] The brake disc 30 is coaxially arranged with the pressure roller 20. The brake disc 30 is arranged on the journal 21 of the pressure roller 20, and the brake disc 30 and the journal 21 are connected by a key 33. The braking mechanism includes a driver 41 and a brake block 43, and the brake block 43 is detachably connected to the driver 41. The pressure roller 20 includes a main body portion 22 and journals 21 at both ends of the main body portion 22. The main body portion 22 includes a cylinder body 23 and a wear-resistant layer 24 sleeved on the cylinder body 23.

[0121] The misalignment adjustment assembly further includes a bracket 10. The pressure roller 20 is arranged on the bracket 10. A kidney-shaped hole 17 is arranged on the bracket 10, and the braking mechanism 40 is connected to the kidney-shaped hole 17. The length direction of the kidney-shaped hole 17 is parallel to the axial direction of the pressure roller 20.

[0122] Taking the winding needle 200 rotating clockwise when winding the electrode tabs as an example, the method of tab misalignment adjustment will be described below.

[0123] When the misalignment amount of the tab 310 of the battery cell 300 in the counterclockwise direction is greater than the threshold value, the winding needle 200 is configured to rotate in the counterclockwise direction (opposite to the direction in which the winding needle 200 winds the electrode sheet, that is, reverse rotation), and the braking mechanism 40 is configured to apply a braking force to at least one side of the brake disc 30 to brake the brake disc 30. The brake disc 30 is used to drive the pressure roller 20 to be braked and the pressure roller 20 presses against the battery cell 300, so as to reduce the misalignment amount of the tab by adjusting the winding tightness of the battery cell 300.

[0124] When the misalignment amount of the tab 310 of the battery cell 300 in the clockwise direction is greater than the threshold value, the winding needle 200 is configured to rotate in the clockwise direction (the same as the direction in which the winding needle 200 winds the electrode sheet, that is, continue to rotate forward), and the braking mechanism 40 is configured to apply a braking force to at least one side of the brake disc 30 to brake the brake disc 30. The brake disc 30 is used to drive the pressure roller 20 to be braked and the pressure roller 20 presses against the battery cell 300, so as to reduce the misalignment amount of the tab by adjusting the winding tightness of the battery cell 300.

[0125] In the above-mentioned battery core winding device, when the misalignment amount of the tab of the battery core 300 is greater than the threshold value, the pressing roller 20 presses against the battery core 300, and the braking mechanism 40 applies a braking force to the brake disc 30 that rotates following the pressing roller 20, so that the brake disc 30 drives the pressing roller 20 to be braked to be stationary or decelerated. Compared with kneading the battery core 300 with a freely rotating pressing roller 20, pressing the battery core 300 with a braked pressing roller 20 can hinder the movement of the tab segment in contact with the battery core 300 and the pressing roller 20, making the tab segment at the center of the battery core 300 and the tab segment pressed by the pressing roller 20 have relative movement. Furthermore, by adjusting the winding tightness of the battery core 300, the misalignment amount of the tab can be reduced, effectively improving the misalignment adjustment effect, improving the misalignment amount of the battery core tab, and reducing the misalignment adjustment time. The brake disc 30 is coaxially arranged on the journal 21 of the pressing roller 20 and the brake disc 30 is connected to the journal 21 through a key 33, which can reasonably arrange the part where the pressing roller 20 presses against the battery core 300 and the part where the brake disc 30 is arranged. With a simple and compact structure, the pressing roller 20 can not only press against the battery core 300 but also be braked under the drive of the brake disc 30, while ensuring the stable connection between the brake disc 30 and the journal 21 of the pressing roller 20, so that the braking force applied to the brake disc 30 can be effectively transmitted to the pressing roller 20. The brake block 43 is detachably connected to the driver 41, which is convenient for replacing the brake block 43 after it wears. The braking mechanism 40 is connected to the waist-shaped hole 17 on the bracket 10, and the length direction of the waist-shaped hole 17 is parallel to the axial direction of the pressing roller 20, so that the braking mechanism 40 can adjust its installation position in the direction parallel to the axial direction of the pressing roller 20, thereby adjusting the relative position between the braking mechanism 40 and the brake disc 30 to reduce eccentric braking. By setting the main body part 22 of the pressing roller 20 to include a cylinder body 23 and a wear-resistant layer 24 sleeved on the cylinder body 23, the inertia of the rotation of the pressing roller 20 can be reduced, which is convenient for the braking mechanism 40 to apply a braking force to the brake disc 30 to drive the pressing roller 20 to be braked. At the same time, the friction force between the pressing roller 20 and the tab segment of the battery core 300 pressed when the pressing roller 20 presses against the battery core 300 can be increased, enhancing the effect of hindering the movement of the tab segment of the battery core 300 being pressed.

[0126] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell winding device, characterized in that: include: A winding needle (200), the winding needle (200) being used to wind the pole piece to form a battery core (300); and A misalignment adjustment assembly (100) comprises a pressure roller (20), a brake disc (30) and a brake mechanism (40), wherein: The brake disc (30) is in the shape of a disc and is configured to rotate following the pressure roller (20); When the misalignment amount of the tab of the battery cell (300) is greater than a threshold value, the braking mechanism (40) is configured to apply a braking force to at least one side of the brake disc (30) to brake the brake disc (30), and the brake disc (30) is configured to drive the pressure roller (20) to be braked and the pressure roller (20) to press against the battery cell (300), so as to reduce the misalignment amount of the tab by adjusting the tightness of the winding of the battery cell (300).

2. The battery core winding device according to claim 1, characterized in that: When the misalignment amount of the pole lug (310) of the battery cell (300) along the first direction is greater than the threshold value, the winding needle (200) is also configured to rotate along the first direction, wherein the first direction is opposite to a second direction, and the second direction is the direction in which the winding needle (200) winds the pole piece.

3. The battery core winding device according to claim 1, characterized in that: When the misalignment amount of the pole lug (310) of the battery cell (300) along the second direction is greater than the threshold value, the winding needle (200) is further configured to rotate along the second direction, wherein the second direction is the direction in which the winding needle (200) winds the pole piece.

4. The battery core winding device according to any one of claims 1 to 3, characterized in that: The brake disc (30) is coaxially arranged with the pressure roller (20).

5. The battery cell winding device according to claim 4, characterized in that: The brake disc (30) is arranged on the journal (21) of the pressure roller (20).

6. The battery cell winding device according to claim 5, characterized in that: The brake disc (30) is connected to the shaft journal (21) via a key (33).

7. The battery core winding device according to any one of claims 1 to 3, characterized in that: The braking mechanism comprises a driver (41) and a brake block (43), wherein the brake block (43) is detachably connected to the driver (41).

8. The battery core winding device according to any one of claims 1 to 3, characterized in that: The misalignment adjustment assembly (100) further comprises a bracket (10), the pressure roller (20) is arranged on the bracket (10), a waist-shaped hole (17) is arranged on the bracket (10), the braking mechanism (40) is connected to the waist-shaped hole (17), and the length direction of the waist-shaped hole (17) is parallel to the axial direction of the pressure roller (20).

9. The battery core winding device according to any one of claims 1 to 3, characterized in that: The pressure roller (20) comprises a main body (22) and shaft necks (21) located at both ends of the main body (22); the main body (22) comprises a cylinder (23) and a wear-resistant layer (24) sleeved on the cylinder (23).

10. A secondary battery production line, characterized in that: It comprises a battery cell winding device as described in any one of claims 1 to 9.

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