Battery cell diaphragm tail rolling mechanism

Abstract

The utility model relates to a battery cell diaphragm tail rolling mechanism. The battery cell diaphragm tail rolling mechanism comprises a left rotating mechanism, a right rotating mechanism and a horizontal servo module, the clamping contact pin is horizontally mounted at the movable end of the left rotating mechanism; a right rotating servo motor, an inserting plate and a pressing wheel mechanism are mounted on the right rotating mechanism; the pressing wheel mechanism comprises a horizontally-arranged pressing wheel extending air cylinder, a vertically-arranged pressing wheel lifting air cylinder and a pressing wheel. The pinch roller extending cylinder extends out and the pinch roller lifting cylinder descends to drive the pinch roller to be in contact with a diaphragm on the surface of the battery cell and press the diaphragm; and the left rotating mechanism and the right rotating mechanism drive the battery cell to rotate to finish diaphragm tail winding. A pin on one side is changed into a plug board with high structural strength, so that the battery cell can be clamped more tightly and stably; and unqualified battery cells caused by bending of the battery cells are avoided. A pressing wheel and a diaphragm blowing rod are additionally arranged, so that the diaphragm is more uniformly and tightly adhered to the battery cell; the creasing of the wrinkled diaphragm on the surface of the battery cell in the subsequent battery cell hot-pressing process caused by poor diaphragm pasting is avoided, and the qualified rate of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core diaphragm winding, in particular to a battery core diaphragm tail winding mechanism. Background Art

[0002] In new energy lithium-ion battery cells, which are produced using a stacking process, the separator is a crucial barrier between the positive and negative electrodes. Damage to the separator can cause a short circuit, posing a fire hazard. Separator winding is a crucial process after cell stacking, and different winding methods are used for different battery cells.

[0003] Existing technical solutions use a membrane wrapping mechanism to wrap the separator around the battery cell. This mechanism has the following characteristics: 1) It uses two simple rotating mechanisms to wrap the separator one to two turns across the width of the battery cell; 2) Each rotating mechanism is equipped with a servo module for forward and reverse movement along the length of the battery cell; and 3) Both rotating mechanisms use two sets of pins to securely clamp the battery cell.

[0004] Among them, the existing battery cell diaphragm tail winding mechanism has the following disadvantages: 1) The diaphragm wrinkles after tail winding: The existing tail winding mechanism simply wraps the diaphragm around the battery cell by rotating the battery cell. Since the thickness of the diaphragm is only between 10 microns and 25 microns, the diaphragm is very thin and will wrinkle after being wrapped around the battery cell; 2) When the clamping pins are feeding and clamping the battery cell, they are prone to hitting the tabs, causing the tabs to fold; 3) The clamping pins are too long, about 350 mm, and the thickness of the pins is about 1.5 mm. The length and thinness of the pins make the battery cell clamped unstable, and even the battery cell is twisted and deformed in the middle; 4) The existing solution uses two sets of servo modules to drive a rotating clamping mechanism respectively, resulting in higher space and cost. Utility Model Content

[0005] The purpose of the utility model is to provide a battery cell diaphragm tail rolling mechanism, aiming to overcome the defects of the existing technology and solve the problem that the battery cell will wrinkle after wrapping, causing the wrinkled diaphragm to produce indentations on the surface of the battery cell during the subsequent battery cell hot pressing process, thereby affecting the battery cell qualification rate.

[0006] To this end, the utility model proposes a battery cell diaphragm tail winding mechanism, comprising a left-rotating mechanism, a right-rotating mechanism, and a horizontal servo module connected to the lower end thereof; the left-rotating mechanism is equipped with a left-rotating servo motor and a clamping pin; the clamping pin is horizontally mounted on the movable end of the left-rotating mechanism;

[0007] The right-rotating mechanism is equipped with a right-rotating servo motor, an insert plate and a pressure wheel mechanism; the pressure wheel mechanism and the insert plate are horizontally installed at the movable end of the right-rotating mechanism, and the pressure wheel mechanism includes a horizontally arranged pressure wheel extension cylinder, a vertically arranged pressure wheel lifting cylinder, and a pressure wheel; wherein, the clamping pin cooperates with the insert plate to clamp the battery cell; the extension of the pressure wheel extension cylinder and the descending of the pressure wheel lifting cylinder drive the pressure wheel to contact the diaphragm on the surface of the battery cell and press the diaphragm; and the left-rotating mechanism and the right-rotating mechanism drive the battery cell to rotate to complete the diaphragm tail winding.

[0008] As a preferred technical solution of the present application, a horizontally extending diaphragm blowing rod is also installed on the pressing wheel mechanism, and the blowing hole of the diaphragm blowing rod faces the surface of the battery cell, so that the diaphragm and the battery cell are completely attached.

[0009] As a preferred technical solution of the present application, the clamping pins have four pins and are distributed in a rectangular array for clamping the battery core.

[0010] As a preferred technical solution of the present application, there are two plug-in plates in total and they are arranged parallel to each other, and cooperate with the clamping pins to clamp the battery core.

[0011] As a preferred technical solution of the present application, the right-rotating mechanism is provided with a tab air blowing mechanism, and the air outlets of the tab air blowing mechanism extend in the horizontal direction.

[0012] As a preferred technical solution of the present application, a tab air blowing mechanism is also provided on the left-hand rotating mechanism, and the two tab air blowing mechanisms are arranged facing each other.

[0013] As a preferred technical solution of the present application, the connecting pipe of the tab blowing mechanism is a flexible and adjustable serpentine pipe.

[0014] As a preferred technical solution of the present application, the horizontal servo module is a dual-slider linear module having two sliders, the left-rotating mechanism is connected to one of the sliders, and the right-rotating mechanism is connected to the other slider.

[0015] As a preferred technical solution of the present application, the horizontal servo module is installed on a horizontal servo module substrate, and a lifting servo base and a lifting servo motor are provided below the horizontal servo module substrate.

[0016] As a preferred technical solution of the present application, a lifting linear guide rail is further provided between the lifting servo base and the horizontal servo module substrate.

[0017] The battery cell diaphragm tail winding mechanism provided by the utility model replaces the pins on one side with a plug plate. The plug plate has high strength and can clamp the battery cell tighter and more stably. It prevents the battery cell from bending, causing damage to the diaphragm and wrinkling inside the battery cell, which may result in unqualified battery cells. By adding a pressure wheel and a diaphragm blowing rod, the diaphragm and the battery cell are attached more evenly and tightly. It prevents the wrinkled diaphragm from causing indentations on the surface of the battery cell during the subsequent hot pressing of the battery cell due to poor diaphragm attachment, thereby improving the qualified rate of the battery cell. By adding a tab blowing mechanism, the tab is prevented from flipping. Tab flipping is also a type of unqualified battery cell. Adding the tab blowing function increases the qualified rate of the battery cell. By replacing two servo modules with one module, costs are reduced and the occupied space is reduced.

[0018] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0020] Figure 1 This is a structural diagram of the battery cell diaphragm tail winding mechanism of the utility model;

[0021] Figure 2 This is an axonometric diagram of the battery cell diaphragm tail winding mechanism of the present invention;

[0022] Description of Reference Numerals

[0023] 1. Lifting servo base; 2. Lifting servo motor; 3. Lifting linear guide rail; 4. Horizontal servo module base plate; 5. Horizontal servo module; 6. Left rotation mechanism; 7. Right rotation mechanism; 8. Left rotation servo motor; 9. Right rotation servo motor; 10. Clamping pin; 11. Insert plate; 12. Pinch wheel; 13. Tab blowing mechanism; 14. Diaphragm blowing rod; 15. Pinch wheel lifting cylinder; 16. Pinch wheel extension cylinder. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] like Figure 1~Figure 2 As shown, the battery cell diaphragm tail winding mechanism of the present invention includes: a lifting servo motor 2, a lifting linear guide rail 3, a lifting servo base 1, a horizontal servo module 5, a horizontal servo module substrate 4, a left rotation mechanism 6, a right rotation mechanism 7, an insert plate 11 and a pressure wheel mechanism.

[0026] The horizontal servo module 5 is a dual-slider linear module with two sliders. A left-hand rotation mechanism 6 is connected to one slider, and a right-hand rotation mechanism 7 is connected to the other slider. Integrating the two rotation mechanisms into one servo module allows for synchronized motion. Placing the two rotation mechanisms on a single long module reduces cost and space.

[0027] Specifically, the lifting servo motor 2 and the lifting linear guide 3 are installed on the lifting servo base 1, the horizontal servo module substrate 4 is installed on the lifting linear guide 3, the horizontal servo module 5 is installed on the horizontal servo module substrate 4, the left rotation mechanism 6 and the right rotation mechanism 7 are installed on the horizontal servo module 5; the left rotation servo motor 8 and the clamping pin 10 are installed on the left rotation mechanism 6; and the clamping pin 10 is horizontally installed at the movable end of the left rotation mechanism 6; the right rotation servo motor 9, the plug plate 11 and the pressure wheel mechanism are installed on the right rotation mechanism 7; and the plug plate 11 and the pressure wheel mechanism are installed at the movable end of the right rotation mechanism 7.

[0028] The clamping pins 10 have four pins arranged in a rectangular array, and two parallel insert plates 11 are provided. These work together to clamp the battery cell. The battery cell clamping pins are redesigned to have pins on one side and an insert plate on the other. The clamping pins on one side of the rotating mechanism are replaced with an insert plate. The shorter and more rigid insert plate provides a tighter and more stable clamping of the battery cell.

[0029] The pressure roller mechanism includes a horizontally mounted pressure roller extension cylinder 16, a vertically mounted pressure roller lifting cylinder 15, and several pressure rollers 12. The extension of the pressure roller extension cylinder 16 and the lowering of the pressure roller lifting cylinder 15 drive the pressure rollers 12 into contact with the diaphragm on the cell surface, compressing the diaphragm. The left-hand rotation mechanism 6 and the right-hand rotation mechanism 7 rotate the cell to complete the diaphragm tail roll. The pressure roller mechanism also features a horizontally extending diaphragm blow rod 14, with its blowhole facing the cell surface, ensuring a complete diaphragm-to-cell contact.

[0030] The four pressing wheels are evenly arranged along the length of the battery cell. When the battery cell is wrapped with the diaphragm and rotates, the pressing wheels always press on the diaphragm, preventing the diaphragm from separating from the battery cell and thus forming an irregular shape. In addition, a blowing rod with the same length as the battery cell is arranged in parallel with the pressing wheels. The blowing rod is hollow and has evenly distributed blowing holes with a diameter of 1.5mm. The blowing holes face the surface of the battery cell. During the process of rotating and wrapping the diaphragm, air is blown to ensure that the diaphragm is tightly and evenly adhered to the surface of the battery cell. In addition, when the diaphragm wrapping is completed and the cutter cuts off the tail diaphragm, the blowing function is also used to blow the end of the diaphragm onto the battery cell.

[0031] The right rotating mechanism 7 is provided with a tab air blowing mechanism 13, the air outlets of which extend horizontally. The left rotating mechanism 6 is also provided with a tab air blowing mechanism 13, and the two tab air blowing mechanisms 13 are arranged facing each other. The connecting pipe of the tab air blowing mechanism 13 is a flexible and adjustable serpentine pipe.

[0032] The problem of the tabs folding down due to gravity is solved by adding an air blowing function: when the battery cells are incoming and the pins on both sides approach the battery cells through the servo, the tabs of the battery cells fold down due to gravity, and the pins will hit the tabs, causing the tabs to flip over. By adding an air blowing tab mechanism, the tabs can overcome gravity and fold down under the action of air pressure, and the pins can be smoothly inserted into the battery cells and clamp the battery cells.

[0033] It should be noted that in order to solve the problem of the qualified rate of the tail roll of the battery cell diaphragm, the addition of air blowing and the pressure wheel of the same type are all protected by this patent.

[0034] The working principle and working process of the battery cell diaphragm tail winding mechanism of the present invention are briefly described below.

[0035] When the battery cell enters the workstation, the lifting servo motor 2 is started, the horizontal servo module substrate 4 rises to the working position, and the tab blowing mechanism 13 is started to keep the tab in a state of overcoming gravity;

[0036] The right-hand rotation mechanism 7 is driven by the horizontal servo module 5 to move in the same direction toward the middle to the working position. At this time, the clamping pin 10 and the plug plate 11 reach the battery cell clamping position and then clamp the battery cell. The pressure roller extension cylinder 16 extends and the pressure roller lifting cylinder 15 descends, so that the pressure roller 12 contacts the diaphragm on the surface of the battery cell and compresses the diaphragm;

[0037] The left-rotating servo motor 8 and the right-rotating servo motor 9 are started synchronously to rotate the battery cell. The diaphragm wraps the battery cell while the battery cell rotates. During this process, the pressure wheel 12 always presses the diaphragm on the surface of the battery cell, and the diaphragm blowing rod 14 always keeps blowing. When the tail roll is finished, the cutter cuts the diaphragm, and the diaphragm blowing rod 14 continues to blow the broken end of the diaphragm to ensure that the diaphragm and the battery cell are fully attached.

[0038] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell diaphragm tail winding mechanism, characterized in that: It includes a left-rotating mechanism (6), a right-rotating mechanism (7), and a horizontal servo module (5) connected to the lower ends thereof; The left-rotating mechanism (6) is provided with a left-rotating servo motor (8) and a clamping pin (10); the clamping pin (10) is horizontally mounted on the movable end of the left-rotating mechanism (6); The right-rotating mechanism (7) is equipped with a right-rotating servo motor (9), an insert plate (11) and a pressure wheel mechanism; the pressure wheel mechanism and the insert plate (11) are horizontally installed at the movable end of the right-rotating mechanism (7); the pressure wheel mechanism includes a horizontally arranged pressure wheel extension cylinder (16), a vertically arranged pressure wheel lifting cylinder (15), and a pressure wheel (12); The clamping pin (10) cooperates with the plug plate (11) to clamp the battery cell; the pressing wheel extension cylinder (16) extends and the pressing wheel lifting cylinder (15) descends to drive the pressing wheel (12) to contact the diaphragm on the surface of the battery cell and press the diaphragm; and the left rotation mechanism (6) and the right rotation mechanism (7) drive the battery cell to rotate to complete the diaphragm tail roll.

2. The battery cell diaphragm tail winding mechanism according to claim 1, characterized in that: A horizontally extending diaphragm blowing rod (14) is also mounted on the pressing wheel mechanism, with the blowing hole of the diaphragm blowing rod (14) facing the surface of the battery cell, so that the diaphragm and the battery cell are completely attached.

3. The battery cell diaphragm tail winding mechanism according to claim 1, characterized in that: The clamping pins (10) have four pins distributed in a rectangular array and are used to clamp the battery core.

4. The battery cell diaphragm tail winding mechanism according to claim 3, characterized in that: There are two plug boards (11) in total and they are arranged parallel to each other, and cooperate with the clamping pins (10) to clamp the battery core.

5. The battery cell diaphragm tail winding mechanism according to claim 1, characterized in that: The right-hand rotating mechanism (7) is provided with a tab air blowing mechanism (13), and the air outlets of the tab air blowing mechanism (13) all extend in the horizontal direction.

6. The battery cell diaphragm tail winding mechanism according to claim 5, characterized in that: The left-hand rotating mechanism (6) is also provided with a tab air blowing mechanism (13), and the two tab air blowing mechanisms (13) are arranged facing each other.

7. The battery cell diaphragm tail winding mechanism according to claim 6, characterized in that: The connecting pipe of the tab blowing mechanism (13) is a flexible and adjustable serpentine pipe.

8. The battery cell diaphragm tail winding mechanism according to claim 1, characterized in that: The horizontal servo module (5) is a double-slider linear module having two sliders, the left rotation mechanism (6) is connected to one of the sliders, and the right rotation mechanism (7) is connected to the other slider.

9. The battery cell diaphragm tail winding mechanism according to claim 8, characterized in that: The horizontal servo module (5) is mounted on a horizontal servo module substrate (4), and a lifting servo base (1) and a lifting servo motor (2) are provided below the horizontal servo module substrate (4).

10. The battery cell diaphragm tail winding mechanism according to claim 9, characterized in that: A lifting linear guide rail (3) is also provided between the lifting servo base (1) and the horizontal servo module substrate (4).

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