Reinforcing device of lithium battery tab

Abstract

The utility model provides a lithium battery tab reinforcing device which comprises a hot welding machine, a reinforcing structure, a hot pressing plate and a tab plate, the reinforcing structure comprises a plurality of trapezoidal reinforcing strips and a plurality of oblique angle reinforcing ribs, and the reinforcing structure is fixed above the tab plate; the tab plate is a sheet plate which is trapezoidal when overlooked, the distance between the trapezoidal upper bottom edge of the tab plate and the trapezoidal upper bottom edge of the reinforcing structure is greater than or equal to 1 / 4 of the height of the tab plate, and the tab plate is used for supplying a cut-off distance of a mark hole; the hot pressing plate is connected with the hot welding machine, the bottom of the hot pressing plate is in contact with the upper part of the reinforcing structure, the range of a tab reinforcing rib is narrowed, the cost is reduced, a gap is reserved between the reinforcing rib and the top of the tab, the cutting of a mark hole is not hindered, the folding amplitude of the tab is reduced, and the risk of short circuit of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery production and processing, in particular to a reinforcing device for a lithium battery pole ear. Background Art

[0002] Lithium battery refers to a battery containing lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in the electrochemical system. In recent years, the application scope of lithium batteries has become increasingly wide. Lithium batteries are widely used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace, and other fields. In the era of rapid development of lithium batteries, the industry has higher and higher requirements for each process of lithium batteries. At present, the pole ears of lithium batteries will fold when they are wound, resulting in NG in the subsequent bare cell insulation test, and there is also a risk of short circuit. The current solution is to insert reinforcing ribs into the pole ears during die cutting to reduce the folding of the pole ears, but there are the following defects: 1. The reinforcing ribs interfere with the cutting of the mark holes; 2. The pole ears are still at risk of folding, which can easily cause short circuits in the battery cells.

[0003] To achieve the above objectives, the utility model provides a reinforcing device for a lithium battery tab, which can solve the problems raised in the above background technology. Utility Model Content

[0004] The utility model adopts the following technical solutions to achieve:

[0005] A reinforcing device for a lithium battery tab, comprising a heat welding machine, a reinforcing structure, a hot pressing plate, and a tab plate, wherein the reinforcing structure comprises a plurality of trapezoidal reinforcing strips and a plurality of oblique reinforcing ribs, and the reinforcing structure is fixed above the tab plate;

[0006] The pole lug plate is a plate that is trapezoidal in top view, and the distance between the trapezoidal upper bottom edge of the pole lug plate and the trapezoidal upper bottom edge of the reinforcement structure is greater than or equal to 1 / 4 of the height of the pole lug plate, which is used to provide a mark hole cutting distance;

[0007] The hot pressing plate is connected to the heat welding machine, and the bottom of the hot pressing plate is in contact with the upper part of the reinforcement structure.

[0008] Preferably, the midpoint of the lower base of the plurality of trapezoidal reinforcement strips is the same as the midpoint of the lower base of the pole lug plate, and the plurality of trapezoidal reinforcement strips are evenly spaced and increased in sequence along the vertical height line of the midpoint of the lower base, and the distance between the upper base of the trapezoidal reinforcement strip with the largest trapezoidal height and the lower base of the pole lug plate is less than or equal to 3 / 4 of the height of the pole lug plate.

[0009] Preferably, the plurality of said oblique angle reinforcement ribs are located above said trapezoidal reinforcement strip;

[0010] The plurality of oblique angle reinforcement ribs include a centerline reinforcement rib, two diagonal reinforcement ribs, and two side midpoint reinforcement ribs;

[0011] The centerline reinforcement rib is located on the vertical line of the midpoint of the lower bottom edge of the trapezoidal reinforcement strip;

[0012] The two diagonal reinforcing ribs are respectively located on the connecting lines of the end points of the upper bottom edges on the same side of the plurality of trapezoidal reinforcing strips;

[0013] The two side midpoint reinforcement ribs are respectively located on the same side side midpoint connection line of the plurality of trapezoidal reinforcement strips.

[0014] Preferably, the upper surface of the hot pressing plate is provided with an upper fixing area connected to the heat welding machine.

[0015] Preferably, the hot pressing plate is a sheet plate that is trapezoidal in top view, and the bottom of the hot pressing plate is provided with two positioning angles that are symmetrical along the midpoint height line of the bottom edge of the hot pressing plate, and the positioning angles are arc-shaped positioning angles;

[0016] The intersection of the upper bottom edge and the side edge of a single trapezoidal reinforcement strip is rounded;

[0017] The two rounded corners of the upper bottom edge of the trapezoidal reinforcement strip with the largest height value correspond to the positioning angles.

[0018] Preferably, a front stopper is provided on the side of the upper bottom edge of the hot pressing plate, and one end of the front stopper extends out of the lowest point of the side of the upper bottom edge of the hot pressing plate;

[0019] A rear pressure strip is provided on the bottom surface of the hot pressing plate near the lower bottom edge, and the distance from the midpoint of the rear pressure strip to the midline of the front stopper is greater than or equal to the height of the pole lug plate.

[0020] Preferably, rear side positioning piles are provided on both sides of the hot pressing plate, and the spacing between the rear side positioning piles is greater than or equal to the maximum bottom side length of the pole lug plate.

[0021] Preferably, the positioning angle and the vertical height of the rear side molding are smaller than the vertical height of the reinforcement structure.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model strengthens the structure by arranging a reinforcement structure on the pole ear part of the lithium battery, thereby enhancing the bending resistance of the pole ear, and at the same time retains a certain position at the edge of the pole ear to adapt to the cutting operation of the mark hole, thereby ensuring the process yield, preventing edge cracking, and improving production efficiency;

[0024] Compared with traditional reinforcement structure solutions, the method described in the utility model can reduce the setting range of the reinforcing ribs, further reduce costs, and at the same time narrow the reinforcement range, which can improve the tensile strength of key areas; after protecting key parts, the bending angle of the pole ear can be reduced to a smaller extent, reducing the risk of battery short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the position of the reinforcement structure of the utility model laid on the pole ear plate;

[0026] Figure 2 A top view of the position where the reinforcement structure of the utility model is laid on the pole lug plate;

[0027] Figure 3 It is a schematic diagram of the upper surface structure of the hot pressing plate of the utility model;

[0028] Figure 4 The schematic diagram of the lower surface structure of the hot pressing plate of the utility model is

[0029] In the figure: 1. Welding heat machine; 2. Reinforcement structure; 3. Hot pressing plate; 4. Lug plate;

[0030] 201, trapezoidal reinforcement strip; 202, oblique angle reinforcement rib;

[0031] 301, front stopper; 302, rear pressure strip; 303, positioning angle; 304, rear positioning pile; 305, upper fixing area. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly connected by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0035] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0036] Please refer to the attached Figure 1-4 , including a heat welding machine, a reinforcement structure 2, a hot pressing plate 3, and a pole ear plate 4, wherein the reinforcement structure 2 includes a plurality of trapezoidal reinforcement strips 201 and a plurality of oblique angle reinforcement ribs 202, and the reinforcement structure is fixed above the pole ear plate 4;

[0037] The pole lug plate 4 is a sheet plate that is trapezoidal in top view, and the distance between the trapezoidal upper base of the pole lug plate 4 and the trapezoidal upper base of the reinforcement structure 2 is greater than or equal to 1 / 4 of the height of the pole lug plate 4, which is used to provide a mark hole cutting distance; the mark hole is a term for positioning marking holes in lithium battery production, which is used to locate and identify the edge connection position of the pole lug, facilitating a series of operations such as connection by fully automatic machinery.

[0038] The hot pressing plate 3 is connected to the heat welding machine, and the bottom of the hot pressing plate 3 is in contact with the upper part of the reinforcement structure 2 .

[0039] Please refer to Figure 2 The midpoint of the lower base of the plurality of trapezoidal reinforcement strips 201 is the same as the midpoint of the lower base of the pole lug plate 4, and the plurality of trapezoidal reinforcement strips 201 are evenly spaced and increased in sequence along the vertical height line of the midpoint of the lower base, and the distance between the upper base of the trapezoidal reinforcement strip 201 with the largest trapezoidal height and the lower base of the pole lug plate 4 is less than or equal to 3 / 4 of the height of the pole lug plate 4.

[0040] Please pay attention to Figure 1 , Figure 2 , the plurality of oblique angle reinforcement ribs 202 are located above the trapezoidal reinforcement strip 201;

[0041] The plurality of oblique angle reinforcement ribs 202 include a centerline reinforcement rib, two diagonal reinforcement ribs, and two side midpoint reinforcement ribs;

[0042] The centerline reinforcement rib is located on the vertical line of the midpoint of the lower bottom edge of the trapezoidal reinforcement strip 201;

[0043] The two diagonal reinforcing ribs are respectively located on the connection lines of the end points of the upper bottom edges on the same side of the plurality of trapezoidal reinforcing strips 201;

[0044] The two side midpoint reinforcement ribs are respectively located on the same side side midpoint connection line of the plurality of trapezoidal reinforcement strips 201 .

[0045] Please pay attention to Figure 4 The upper surface of the hot pressing plate 3 is provided with an upper fixing area 305 connected to the heat welding machine.

[0046] Please pay attention to Figure 3 The hot pressing plate 3 is a sheet plate that is trapezoidal in top view, and the bottom of the hot pressing plate 3 is provided with two positioning angles 303 that are symmetrical along the midpoint height line of the bottom side of the hot pressing plate 3, and the positioning angles 303 are arc-shaped positioning angles 303;

[0047] The intersection of the upper bottom edge and the side edge of the single trapezoidal reinforcement strip 201 is rounded;

[0048] The two rounded corners of the upper bottom side of the trapezoidal reinforcement strip 201 with the largest height value correspond to the positioning angle 303 .

[0049] Please pay attention to Figure 1-3 , a front side stopper 301 is provided on the side of the upper bottom edge of the hot pressing plate 3, and one end of the front side stopper 301 extends out of the lowest point of the side of the upper bottom edge of the hot pressing plate 3;

[0050] A rear pressure strip 302 is provided on the bottom surface of the hot pressing plate 3 near the lower bottom edge, and the distance from the midpoint of the rear pressure strip 302 to the midline of the front stopper 301 is greater than or equal to the height of the pole lug plate 4; rear positioning piles 304 are provided on both sides of the hot pressing plate 3, and the spacing between the rear positioning piles 304 is greater than or equal to the maximum bottom edge length of the pole lug plate 4;

[0051] The vertical height of the positioning angle 303 and the rear pressure strip 302 is smaller than the vertical height of the reinforcement structure 2 .

[0052] The specific implementation of the utility model is as follows: First, in the utility model, the selection of the heat welding machine is mainly to use a series of electric soldering tools to fix the heat welding machine and the hot pressing plate 3, so that the heat welding machine can heat the hot pressing plate 3, and use a device similar to an electric heating clamp to clamp the pole ear plate 4. The upper contact plate surface is the hot pressing plate 3, and the lower part is an adaptation platform. The heat welding machine is used to heat the hot pressing plate 3, melt and hot press the structure of the reinforcement structure 2, and fix it to the surface of the pole ear plate 4;

[0053] When the operator is performing the lug reinforcement operation, he uses a hot welding machine to move the hot pressing plate 3 to the surface of the lug plate 4, places the reinforcement structure 2 and the upper surface of the lug plate 4, so that the inner side of the front stopper 301 is aligned with the side of the trapezoidal upper bottom surface of the lug plate 4, presses down the rear pressure strip 302 at the front end of the hot pressing plate 3, pushes the front end of the reinforcement structure 2 to align and position at the positioning angle 303, and the two corners of the rear positioning pile 304 are close to the lug corners of the lithium battery. Manual clamping or pressing is performed to generate a bite force on the reinforcement structure 2 and the lug plate 4, and heating is performed at the same time to obtain a hot pressing effect on the reinforcement structure 2, so that it is fixed to the upper surface of the lug plate 4. The material of the reinforcement structure 2 can be a metal with a low melting point, such as tin, or an alloy material with a low melting point.

[0054] The above description of the utility model in combination with the accompanying drawings is an exemplary description. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as the non-substantial improvements are made by adopting the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A reinforcing device for a lithium battery tab, characterized in that: It comprises a thermal welding machine, a reinforcement structure (2), a hot pressing plate (3), and a pole lug plate (4), wherein the reinforcement structure (2) comprises a plurality of trapezoidal reinforcement strips (201) and a plurality of oblique reinforcement ribs (202), and the reinforcement structure is fixed above the pole lug plate (4); The pole lug plate (4) is a plate having a trapezoidal shape when viewed from above, and the distance between the trapezoidal upper bottom edge of the pole lug plate (4) and the trapezoidal upper bottom edge of the reinforcement structure (2) is greater than or equal to 1 / 4 of the height of the pole lug plate (4), so as to provide a cutting distance for the mark hole; The hot pressing plate (3) is connected to the heat welding machine, and the bottom of the hot pressing plate (3) is in contact with the upper part of the reinforcement structure (2); The midpoint position of the lower base of the plurality of trapezoidal reinforcement strips (201) is the same as the midpoint position of the lower base of the pole lug plate (4); the plurality of trapezoidal reinforcement strips (201) are evenly spaced and increase in sequence along the vertical height line of the midpoint of the lower base; the distance between the upper base of the trapezoidal reinforcement strip (201) with the largest trapezoidal height and the lower base of the pole lug plate (4) is less than or equal to 3 / 4 of the height of the pole lug plate (4).

2. The reinforcing device for a lithium battery tab according to claim 1, characterized in that: The plurality of oblique angle reinforcement ribs (202) are located above the trapezoidal reinforcement strip (201); The plurality of oblique angle reinforcement ribs (202) include a centerline reinforcement rib, two diagonal reinforcement ribs, and two side midpoint reinforcement ribs; The centerline reinforcement rib is located on a vertical line at the midpoint of the lower bottom edge of the trapezoidal reinforcement strip (201); The two diagonal reinforcing ribs are respectively located on the connection lines of the end points of the upper bottom edges of the plurality of trapezoidal reinforcing strips (201) on the same side; The two side midpoint reinforcement ribs are respectively located on the same-side side midpoint connection line of the plurality of trapezoidal reinforcement strips (201).

3. The reinforcing device for a lithium battery tab according to claim 1, characterized in that: An upper fixing area (305) is provided on the upper surface of the hot pressing plate (3) and is connected to the heat welding machine.

4. The reinforcing device for a lithium battery tab according to claim 1, characterized in that: The hot pressing plate (3) is a sheet plate that is trapezoidal in plan view, and the bottom of the hot pressing plate (3) is provided with two positioning angles (303) that are symmetrical along the midpoint height line of the bottom edge of the hot pressing plate (3), and the positioning angles (303) are arc-shaped positioning angles (303); The intersection of the upper bottom edge and the side edge of a single trapezoidal reinforcement strip (201) is rounded; The two rounded corners of the upper bottom edge of the trapezoidal reinforcement strip (201) with the largest height value correspond to the positioning angle (303).

5. The reinforcing device for a lithium battery tab according to claim 4, characterized in that: A front stopper (301) is provided on the side of the upper bottom edge of the hot pressing plate (3), and one end of the front stopper (301) extends out of the lowest point of the side of the upper bottom edge of the hot pressing plate (3); A rear pressure strip (302) is provided on the bottom surface of the hot pressing plate (3) near the lower bottom edge, and the distance from the midpoint of the rear pressure strip (302) to the midline of the front stopper (301) is greater than or equal to the height of the pole lug plate (4).

6. A lithium battery tab reinforcement device according to claim 5, characterized in that: Rear positioning piles (304) are provided on both sides of the hot pressing plate (3), and the spacing between the rear positioning piles (304) is greater than or equal to the maximum bottom edge length of the pole lug plate (4).

7. The reinforcing device for a lithium battery tab according to claim 5, characterized in that: The vertical heights of the positioning angle (303) and the rear pressure strip (302) are smaller than the vertical height of the reinforcement structure (2).

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