Position determining tool for foil tabs of multi-tab lithium ion battery pole group

Abstract

The utility model belongs to the technical field of multi-tab lithium ion battery manufacturing, and particularly relates to a multi-tab lithium ion battery pole group foil tab position determining tool. Comprising a supporting plate, a cover plate and fixing buckles, a groove used for containing a pole group is formed in the middle of the supporting plate, the cover plate is hinged to the bottom of the supporting plate and used for pressing the pole group, the fixing buckles are arranged on the two sides of the supporting plate and used for pressing the cover plate, and a supporting plate through groove is formed in the top of the supporting plate and used for allowing a blade to penetrate through to cut the pole group. The tool is simple in structure, convenient to operate and free of theoretical calculation. The adaptive pole group is placed in the groove of the supporting plate of the tool, and the adaptive through groove is cut by the blade, so that the positions of positive and negative pole foil tabs are simply, quickly and accurately confirmed, the laser cutting process of positive and negative pole pieces is further confirmed, the winding remodeling efficiency is greatly improved, the remodeling cost is saved, and the tool is suitable for batch production.

Description

Technical Field

[0001] This utility model belongs to the field of multi-tab lithium-ion battery manufacturing technology, and in particular relates to a tooling for determining the position of the tabs on the electrode group foil of a multi-tab lithium-ion battery. Background Technology

[0002] With the increasing demand for fast charging and discharging in polymer pouch lithium-ion batteries, stacked and wound electrode structures are being used in many multi-tab cells. Among them, the multi-tab wound electrode structure is relatively simple, adding foil tabs to the ordinary wound electrode structure, which greatly reduces the internal resistance of the cell and helps to improve the lithium-ion transmission efficiency, playing an important role in improving various performance aspects of the cell.

[0003] Because multi-tab wound battery manufacturing requires pre-reserving foil tabs above each layer of positive and negative electrode sheets for subsequent hard tab transfer, the position of the foil tabs corresponding to each layer of electrode sheets is difficult to determine. Chinese invention patent CN107394097B discloses a method for accurately positioning the tabs of a multi-tab wound lithium-ion battery. This method establishes an ideal physical model for tab positioning during the winding of the multi-tab core, derives a unified mathematical expression for each layer of tabs, introduces actual working conditions (parameters including tab center distance, winding needle width, correction factor, thickness of positive and negative electrode sheets, and thickness of separator), and then numerically corrects the mathematical expression using correction factors to finally calculate the precise position of each tab. However, this method does not consider the influence of other uncontrollable factors such as winding tension during the electrode winding process, which may lead to deviations between the theoretical calculations and actual values. Therefore, the alignment of each layer of foil tabs directly affects the subsequent welding effect. This tooling design allows for direct confirmation of the positions of the positive and negative electrode tabs based on the confirmed electrode width and the coverage of the positive and negative electrode sheets. This, in turn, confirms the laser cutting process of the positive and negative electrode sheets, greatly improving the winding and changing efficiency and saving changing costs. Utility Model Content

[0004] The purpose of this utility model is to provide a tooling for determining the position of the tabs on the electrode group foil of a multi-tab lithium-ion battery, which solves the problem of directly determining the position of the positive and negative electrode foil tabs after confirming the width of the electrode group and the coverage of the positive and negative electrode sheets.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fixture for determining the position of the tabs on a multi-tab lithium-ion battery electrode assembly foil, comprising a support plate, a cover plate, and fixing buckles. The support plate has a groove in the middle for placing the electrode assembly. The cover plate is hinged to the bottom of the support plate to press the electrode assembly firmly. The fixing buckles are located on both sides of the support plate to press the cover plate firmly. The top of the support plate has a through groove for a blade to pass through and cut the electrode assembly. The through groove design of this fixture facilitates precise positioning and cutting of the electrode assembly by the blade.

[0006] Preferably, the position of the tray through groove matches the design value of the electrode assembly foil tab. This facilitates the use of a blade to make cuts on the top of the electrode assembly along the tray through groove after the electrode assembly has been fully pressed together by the cover plate and locked with the retaining buckle.

[0007] Preferably, the length, width, and depth of the groove in the tray match the size of the electrode assembly.

[0008] Preferably, the retaining buckle is movably connected to the tray via a rotating shaft. When the cover is closed, the retaining buckle is rotated to press the cover tightly.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] This fixture has a simple structure, is easy to operate, requires no theoretical calculations, and is highly efficient. By placing the suitable electrode assembly into the groove of this fixture and cutting the suitable through groove with a blade, the position of the positive and negative electrode tabs can be easily, quickly, and accurately determined, thereby confirming the laser cutting process of the positive and negative electrode sheets. This greatly improves the winding and changing efficiency, thus saving changing costs and making it suitable for mass production. Attached Figure Description

[0011] Figure 1 This is a perspective view of the entire utility model;

[0012] Figure 2 This is a perspective view of the present invention after the electrode assembly has been placed;

[0013] Figure 3 This is a perspective view of the cutting of the pole assembly with a blade in this utility model;

[0014] Figure 4 This is a three-dimensional view of the electrode assembly with through slots cut out.

[0015] In the diagram: 1. Support plate; 2. Cover plate; 3. Fixing buckle; 4. Support plate through slot; 5. Pole group; 6. Blade; 7. Pole group through slot. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the specific implementation of this utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixed connection," and "fixed connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through specific circumstances. Without departing from the principle of this utility model, several improvements and modifications can be made, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0019] like Figure 1 As shown, a fixture for determining the position of the tabs on a multi-tab lithium-ion battery electrode assembly includes a support plate 1, a cover plate 2, and a retaining clip 3. The groove in the center of the support plate 1 is used to place the electrode assembly. The cover plate 2 is hinged to the bottom of the support plate 1, making it easier to open and close. The retaining clip 3 is connected to both sides of the support plate via a rotating shaft; when the cover plate is closed, the retaining clip 3 is rotated to press the cover plate 2 firmly. The top of the support plate has a through groove that matches the design value of the electrode assembly foil tabs.

[0020] like Figure 2 As shown, specifically, in this scheme, the electrode assembly 5 is placed in the groove of the support plate 1, and the size of the groove is designed to match the size of the electrode assembly 5. The groove of the support plate 1, together with the pressing cover plate 2, firmly fixes the electrode assembly 5 in the groove of the support plate 1, which facilitates subsequent cutting by the blade 6.

[0021] like Figure 3 As shown, specifically, in this scheme, a blade 6 is used to make cuts along the tray groove 4 on the top of the electrode assembly 5. Since the position of the tray groove 4 matches the position of the foil tabs of the electrode assembly 5, the final result is as follows... Figure 4 As shown, there is an electrode through-slot 7 above electrode group 5. The cutting depth of electrode through-slot 7 depends on the alignment of the electrode sheets in electrode group 5, that is, the minimum depth is sufficient to cut to the electrode sheets. After cutting the electrode sheets, the position of each foil tab (blade mark position) is obtained by unwinding the wound electrode group, thereby assisting the subsequent laser cutting process.

[0022] The working principle of this tooling is as follows: First, place the electrode group 5 to be cut in the tray 1. Then, press the electrode group 5 with the cover plate 2 and rotate the fixing buckle 3 so that the cover plate 2 completely presses the electrode group 5 into the groove of the tray 1. Take out the blade 6 and make a cutting mark on the top of the electrode group 5 along the through groove 4 of the tray to finally obtain the position of each foil tab.

[0023] It should be noted that this fixture is also suitable for various soft-pack battery cells that require confirmation of tab positions, such as laminated structures and multi-tab structures. The dimensions of this fixture can be designed according to the battery cell model, making it suitable for mass production of battery cells of the same size. In principle, based on the minimum precision of the machining head, the upper limit of the width of the electrode slot 7 is determined to be 0.4mm, and the range of battery cell sizes that can be processed is: length 20mm-150mm, width 20mm-120mm, and thickness 1mm-20mm.

Claims

1. A fixture for determining the position of the tabs on a multi-tab lithium-ion battery electrode assembly foil, characterized in that: The device includes a tray, a cover plate, and a retaining buckle. The tray has a groove in the middle for placing the electrode assembly. The cover plate is hinged to the bottom of the tray for pressing the electrode assembly. The retaining buckle is located on both sides of the tray for pressing the cover plate. The top of the tray has a tray through groove for the blade to pass through and cut the electrode assembly.

2. The fixture for determining the position of the tabs on a multi-tab lithium-ion battery electrode assembly according to claim 1, characterized in that: The position of the tray through groove matches the design value of the electrode group foil tab.

3. The fixture for determining the position of the tabs on a multi-tab lithium-ion battery electrode assembly according to claim 1, characterized in that: The length, width, and depth of the groove in the tray match the dimensions of the electrode assembly.

4. The fixture for determining the position of the tabs on a multi-tab lithium-ion battery electrode assembly according to claim 1, characterized in that: The fixing buckle is movably connected to the tray via a rotating shaft.

Images