Lithium ion battery roll core tab shaping tool

Abstract

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery roll core tab shaping tool. The using method of the lithium ion battery roll core tab shaping tool comprises the steps that before an ultrasonic welding device is used for welding, the pressing plate is arranged on the roll core, the pressing plate is tightly pressed to be tightly attached to the upper surface of the roll core, and the limiting strips are flush with the side face of the roll core. At the moment, the bending plate forming a preset angle with the pressing plate extends downwards, and the bending end is in contact with and bends part of or all the tabs, so that the position difference between the tail ends of the tabs and the roll core caused by different positions of the roots of the tabs after gathering is compensated. The lithium ion battery roll core tab shaping tool can simply shape tabs, so that the last layer of tabs is flush with or basically flush with the first layer of tabs, tab cutting is not needed, the time required by the cutting procedure and the equipment investment are saved, the production efficiency is improved, and the production cost is reduced. And safety accidents such as safety explosion caused by short circuit of the battery cell in the later period due to metal foreign matters possibly introduced in the cutting process can be avoided.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, specifically relating to a lithium-ion battery core tab shaping tool. Background Technology

[0002] Lithium-ion batteries are prone to fire and explosion under conditions such as short circuits, impacts, and punctures. As a crucial component connecting the lithium-ion battery to the external circuit for electron transmission, the design and manufacturing process of the tabs significantly impacts battery performance and safety.

[0003] After ultrasonic welding of lithium-ion battery tabs, the tabs typically need to be trimmed and shaped to prevent untrimmed portions from affecting subsequent processes. For example, excessively long tabs can cover the laser welding marks, making laser welding impossible. However, the tab trimming process inevitably generates metal debris, which can fall into the battery cell and puncture the separator during charging and discharging, causing a short circuit and potentially leading to fire or explosion. Another solution involves designing the top cover pins for laser welding to be wide enough to allow sufficient spacing between the two weld marks. This eliminates the need for tab trimming and shaping, and the tabs do not cover the laser welding area. However, increasing the pin width increases material costs, top cover weight, reduces cell energy density, and increases production costs, ultimately reducing the cell's market competitiveness.

[0004] Therefore, how to control the shape and size of the electrode lugs after welding is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] In view of the current situation, this utility model provides a lithium-ion battery core tab shaping tool, which solves at least one of the above-mentioned technical problems.

[0006] The technical solution provided in this application is a lithium-ion battery core tab shaping fixture, including: a pressure plate for contacting and positioning the core surface, and a bending plate connected to the pressure plate; the bending plate includes a bent end for contacting and bending the tab, and the bending plate and the pressure plate are fixed relative to each other at a preset angle; the pressure plate includes a limiting strip for abutting against the side of the core to limit the relative position of the bent end and the core.

[0007] Furthermore, the preset angle is 90 degrees to 150 degrees.

[0008] Furthermore, the thickness of the bent end is 0.05 to 0.3 times the thickness of the core.

[0009] Furthermore, the horizontal distance between the bent end and the side of the limiting strip closest to the core is 0.1 to 1 times the thickness of the core.

[0010] Furthermore, the vertical distance between the bent end and the side of the pressure plate closest to the core is 0.1 to 1 times the thickness of the core.

[0011] Furthermore, the width of the bent plate is greater than or equal to the width of the tab.

[0012] Furthermore, the bent end is configured with rounded corners.

[0013] Furthermore, the pressure plate and the bending plate are rotatably connected, and the system also includes a support for fixing the pressure plate and the bending plate to form a preset angle.

[0014] Furthermore, the bending plate includes a gripping plate for easy holding to adjust the rotation angle, the gripping plate being integrally formed with the bending plate and located at the end away from the bending end.

[0015] Furthermore, the support includes a toothed pattern and a retaining plate. The toothed pattern is provided on the gripping plate, and the retaining plate is rotatably connected to the pressure plate. The retaining plate can abut against different positions within the toothed pattern to fix the pressure plate and the bending plate to form a preset angle.

[0016] The beneficial effects of this application are as follows:

[0017] The lithium-ion battery core tab shaping fixture of this application is used as follows: Before welding with an ultrasonic welding device, a pressure plate is placed on the core and pressed tightly against the upper surface of the core, and the limiting strip is flush with the side of the core. At this time, a bending plate at a preset angle to the pressure plate extends downward, and the bending end contacts and bends part or all of the tabs to compensate for the difference in the position of the tab end from the core caused by the different positions of the tab roots after gathering. The lithium-ion battery core tab shaping fixture of this application can perform simple shaping of the tabs, so that the last layer of tabs is flush with or nearly flush with the first layer of tabs, without the need for tab cutting, saving the time and equipment investment required for the cutting process, and avoiding safety accidents such as short circuits and explosions caused by metal foreign objects introduced during the cutting process. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0019] Figure 1 A schematic diagram of the winding core and electrode tabs;

[0020] Figure 2 This is a schematic diagram of ultrasonic welding electrode tabs;

[0021] Figure 3 A schematic diagram of an embodiment of a lithium-ion battery core tab shaping fixture;

[0022] Figure 4 A schematic diagram of using the ultrasonic welding electrode tab assisted in Example 1;

[0023] Figure 5 A schematic diagram of Embodiment 2 of a lithium-ion battery core tab shaping fixture;

[0024] Figure 6 for Figure 5 A side view diagram.

[0025] Figure label:

[0026] The lithium-ion battery core tab shaping fixture provided in Example 1 includes: core 201; tab 202; welding head 301; boss 302; pressure plate 1; bending plate 2; bending end 21; limiting strip 3; holding plate 4; support part 5; serrated pattern 51; clamping plate 52; and blocking strip 6. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of description and simplification of operation. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0032] First reference Figure 1 A layered core 201 has two or more stacked tabs 202, which must be ultrasonically welded together before subsequent processes. (Reference) Figure 2 An ultrasonic welding device includes a welding head 301 and a boss 302. During ultrasonic welding, the tabs 202 are placed above the boss 302, and the welding head 301 reciprocates to ultrasonically weld together two or more tabs 202. This welding method can cause the ends of the tabs 202 to be uneven, and the distance between the farthest and nearest tab ends from the core 201 can be as shown in D1.

[0033] In a single-turn, two-tab winding design, D1 ≥ the design thickness of a single winding. For example, if the design thickness of a single winding is 10mm, then D1 ≥ 10mm. In a single-turn, one-tab winding design, D1 ≥ 1 / 2 the design thickness of a single winding. For example, if the design thickness of a winding is 10mm, then D1 ≥ 5mm. An excessively large D1 can lead to a series of problems, such as occupying internal battery space, reducing battery energy density, and causing short circuits due to the tab 202 being inserted backwards into the electrode. Cutting off the excess tab 202 would require additional time and equipment investment for the cutting process, and the potential for metal foreign objects introduced during the cutting process to cause short circuits and explosions in the later stages of the battery cell.

[0034] The lithium-ion battery core tab shaping fixture 100 provided in Embodiment 1 includes: a pressure plate 1 for contacting and positioning the core 201 surface, and a bending plate 2 connected to the pressure plate 1; the bending plate 2 includes a bent end 21 for contacting and bending the tab 202, and the bending plate 2 and the pressure plate 1 are fixed relative to each other at a preset angle; the pressure plate 1 includes a limiting strip 3 for abutting against the side of the core 201 to limit the relative position of the bent end 21 and the core 201.

[0035] For ease of implementation and use, in this embodiment, the pressure plate 1 and the bending plate 2 are integrally formed.

[0036] The method of using the lithium-ion battery core tab shaping fixture of this application is as follows: Before welding with an ultrasonic welding device, the pressure plate 1 is placed on the core 201 and pressed tightly against the upper surface of the core 201, and the limiting strip 3 is flush with the side of the core 201 (the limiting strip 3 may press down on part of the tab 202 at this time). At this time, the bending plate 2, which is at a preset angle to the pressure plate 1, extends downward, and the bending end 21 contacts and bends part or all of the tab 202, so as to compensate for the positional difference between the end of the tab 202 and the core 201 caused by the different positions of the roots of the tab 202 after gathering.

[0037] The lithium-ion battery core tab shaping fixture of this application performs simple shaping on the tab 202, and the farthest and closest tab ends from the core 201 can be separated by a distance such as D2. By adjusting the preset angle, D2 can be changed accordingly, so that the last layer of tabs 202 is flush or basically flush with the first layer of tabs 202. There is no need to cut the tabs 202, which saves the time and equipment investment required for the cutting process, as well as the safety accidents such as explosions caused by metal foreign objects that may be introduced during the cutting process and lead to short circuits in the battery cells later.

[0038] In some embodiments of this disclosure, the preset angle is 90 degrees to 150 degrees. The preset angle can be specifically determined according to the distribution of the tabs 202. If the angle is too large, the bending effect will be insignificant and the overall size will increase. If the angle is too small, the tabs 202 will bend too much or too quickly, which may damage the tabs 202. In this embodiment, the preset angle is 97 degrees.

[0039] In some embodiments of this disclosure, the thickness of the bent end 21 is 0.05 to 0.3 times the thickness of the core 201. The greater the thickness, the larger the "U"-shaped bend at the bend, and the gentler the bend. Therefore, the thickness can be determined comprehensively based on the structural strength of the tab 202 and the positional differences of the tabs 202 between layers. In this embodiment, the thickness of the bent end 21 is 0.1 times the thickness of the core 201.

[0040] In some embodiments of this disclosure, the horizontal distance between the bent end 21 and the side of the limiting strip 3 near the core 201 is 0.1 to 1 times the thickness of the core 201. A larger distance results in a gentler bend; however, an excessively large distance will cause the bend angle to be too close to the ultrasonic welding working area. This distance can be determined based on the size of the electrode tab 202 and other factors. In this embodiment, the horizontal distance between the bent end 21 and the side of the limiting strip 3 near the core 201 is 0.15 times the thickness of the core 201.

[0041] In some embodiments of this disclosure, the vertical distance between the bent end 21 and the side of the pressure plate 1 closest to the core 201 is 0.1 to 1 times the thickness of the core 201. This distance determines the proportion of the tabs 202 bent by this tooling to all tabs 202. In some implementation scenarios, the tabs 202 on the side away from this tooling are gathered together by ultrasonic welding and are not far from other tabs 202 without bending, so there is no need to affect the normal welding of this application. In this embodiment, the vertical distance between the bent end 21 and the side of the pressure plate 1 closest to the core 201 is 0.3 times the thickness of the core 201.

[0042] In some embodiments of this disclosure, the width of the bending plate 2 is greater than or equal to the width of the tab 202, so that the contact area between the bent end 21 and the tab 202 is as large as possible, thereby reducing the probability of damage to the tab 202.

[0043] In this embodiment, the bent end 21 is configured with rounded corners to reduce the probability of the bent end 21 damaging or scratching the tab 202.

[0044] The lithium-ion battery core tab shaping fixture provided in Embodiment 2 is similar to that in Embodiment 1, and also includes a pressure plate 1 for contacting and positioning the core 201 surface, and a bending plate 2 connected to the pressure plate 1; the bending plate 2 includes a bent end 21 for contacting and bending the tab 202, and the bending plate 2 and the pressure plate 1 are fixed relative to each other at a preset angle; the pressure plate 1 includes a limiting strip 3 for abutting against the side of the core 201 to limit the relative position of the bent end 21 and the core 201.

[0045] In this embodiment, the pressure plate 1 and the bending plate 2 are rotatably connected, and a support part 5 is also included for fixing the pressure plate 1 and the bending plate 2 to form a preset angle. That is, the preset angle in this embodiment is easy to adjust, which facilitates the adjustment of the bending degree of the tab 202, and allows the user to observe and adjust D2 step by step. The lithium-ion battery core tab shaping fixture provided in this embodiment is suitable as a testing fixture to determine the preset angle and obtain a better bending scheme. Compared with Embodiment 1, it is easier to adjust, but its stability during the bending process in actual production is weaker than that of Embodiment 1.

[0046] In this embodiment, the bending plate 2 includes a gripping plate 4 for easy holding to adjust the rotation angle, located at the end away from the bending end 21. Specifically, the gripping plate 4 is integrally formed with the bending plate 2, and the middle part of the plate body formed by the gripping plate 4 and the bending plate 2 is hinged to the pressure plate 2. One end of the plate body is easy to hold, and the other end has a bending end 21.

[0047] In this embodiment, the side of the pressure plate 1 away from the core 201 also includes a blocking strip 6. The test fixture usually needs to be manually pressed down, and a heavy object is used to press down the pressure plate 1 during ultrasonic welding to prevent the fixture from shifting. The blocking strip 6 is used to prevent the heavy object from falling accidentally during ultrasonic welding to avoid damaging the ultrasonic welding device and other equipment.

[0048] In this embodiment, the support part 5 includes a toothed pattern 51 and a retaining plate 52. The toothed pattern 51 is disposed on the gripping plate 4, and the retaining plate 52 is rotatably connected to the pressure plate 1. The retaining plate 52 can abut against different positions in the toothed pattern 51 to fix the pressure plate 1 and the bending plate 2 to form a preset angle.

[0049] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A lithium-ion battery core tab shaping fixture, characterized in that, include: A pressure plate (1) for contacting and positioning the core (201) surface, and a bending plate (2) connected to the pressure plate (1); the bending plate (2) includes a bent end (21) for contacting and bending the tab (202), and the bending plate (2) is fixed relative to the pressure plate (1) at a preset angle; the pressure plate (1) includes a limiting strip (3) for abutting against the side of the core (201) to define the relative position of the bent end (21) and the core (201).

2. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The preset angle is 90 degrees to 150 degrees.

3. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The thickness of the bent end (21) is 0.05 to 0.3 times the thickness of the core (201).

4. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The horizontal distance between the bent end (21) and the limiting strip (3) on the side near the core (201) is 0.1 to 1 times the thickness of the core (201).

5. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The vertical distance between the bent end (21) and the side of the pressure plate (1) near the core (201) is 0.1 to 1 times the thickness of the core (201).

6. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The width of the bending plate (2) is greater than or equal to the width of the tab (202).

7. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The bent end (21) is configured with a rounded corner.

8. The lithium-ion battery core tab shaping fixture according to claim 1, characterized in that, The pressure plate (1) is rotatably connected to the bending plate (2), and also includes a support part (5) for fixing the pressure plate (1) and the bending plate (2) to form the preset angle.

9. The lithium-ion battery core tab shaping fixture according to claim 8, characterized in that, The bending plate (2) includes a gripping plate (4) for easy gripping to adjust the rotation angle. The gripping plate (4) is integrally disposed with the bending plate (2) and located at the end away from the bending end (21).

10. The lithium-ion battery core tab shaping fixture according to claim 9, characterized in that, The support part (5) includes a toothed pattern (51) and a retaining plate (52). The toothed pattern (51) is disposed on the gripping plate (4). The retaining plate (52) is rotatably connected to the pressure plate (1). The retaining plate (52) can abut against different positions in the toothed pattern (51) to fix the pressure plate (1) and the bending plate (2) to form the preset angle.

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