Collecting plate of lithium ion battery

Abstract

The utility model belongs to the field of batteries, particularly relates to a current collecting plate of a lithium ion battery, and provides the following scheme aiming at the problems that an existing traditional current collecting plate is relatively low in strength, is not supported with a steel shell boss, is easy to warp after being extruded by a roll core, and is difficult to reverse, and the current collecting plate of the lithium ion battery comprises a current collecting plate main body of the lithium ion battery, the boss is arranged at the middle position of the top of the current collecting plate main body of the lithium ion battery; the shell welding area is arranged on the outer side of the boss; by means of the design of the boss, the shell body welding area and the tab welding area, the edge of the shell body welding area can be prevented from warping, the gap between the shell body and the current collecting disc body of the lithium ion battery is reduced, the welding stability is improved, the boss and the liquid guide groove hole area enable attachment to be better, the welding stability is improved, and the reliability of the lithium ion battery is improved. The strength of the collector plate main body of the lithium ion battery can be improved, and an anti-reaction effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a lithium ion battery current collecting disc. BACKGROUND

[0002] Cylindrical batteries are widely used in the fields of intelligent furniture, power tools, two-wheeled electric vehicles, etc. due to their high mechanical strength, good safety, and the fact that the battery volume does not expand and deform during use.

[0003] Power tools, two-wheeled electric vehicles, etc. require batteries to have both high capacity and high power capability to meet the needs of range, charging speed, and high-power discharge. As market demand continues to increase, the diameter and height of cylindrical batteries continue to increase, from the initial 18650 model to the 21700 / 26700 / 32140 / 40135 / 4680 / 46120 / 60150 model, and the battery volume and weight continue to increase.

[0004] Large cylindrical full-tab cylindrical batteries are an extremely effective way to improve the rate capability of cylindrical batteries. They are made by setting positive and negative full tabs at both ends of the winding core.

[0005] Flexible tabs need to be attached to the ends of the winding core by extrusion, flattening, or flattening. Since the tabs at both ends of the winding core are flexible, the end face cannot be guaranteed to be flat, which leads to poor welding stability of the current collecting disc and the tabs. The existing steel shell structure has a boss at the bottom to avoid damage due to thermal expansion and contraction during production. The traditional current collecting plate has low strength and no support between the steel shell boss, which is prone to warping after being extruded by the winding core, affecting the welding of the current collecting disc and the shell. At the same time, the circular current collecting disc is a symmetrical structure, which is difficult to prevent from being reversed and prone to assembly errors. SUMMARY

[0006] The utility model aims at solving the problems of low strength of traditional current collecting plates, lack of support between the steel shell boss, and difficulty in preventing reversal in the prior art, and provides a lithium ion battery current collecting disc.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] A lithium ion battery current collecting disc, comprising

[0009] A lithium ion battery current collecting disc body;

[0010] A boss is arranged at the middle position of the top of the lithium ion battery current collecting disc body;

[0011] A shell welding area is arranged on the outer side of the boss;

[0012] A tab welding area is arranged in the gap of the boss;

[0013] The liquid guide groove hole area is arranged at the bottom of the boss;

[0014] The D-shaped hole is arranged at the inner side of the liquid guide groove hole area, through the design of the boss, the shell welding area and the tab welding area, the edge warping of the shell welding area can be prevented, the gap between the shell and the lithium ion battery current collector main body is reduced, the welding stability is improved, the boss and the liquid guide groove hole area make the fit better, the welding stability is improved, the strength of the lithium ion battery current collector main body is also improved, and the anti-reaction effect is achieved.

[0015] As a preferred scheme of the utility model, the lithium ion battery current collector main body is a non-mirror symmetry structure, and the shell welding area at the outer edge of the lithium ion battery current collector main body is circular, so that the tightness of the fit can be ensured.

[0016] As a preferred scheme of the utility model, the shell welding area is a circular plane, the boss protrudes upward, the liquid guide groove hole area is a downward recess, and the depth of the liquid guide groove hole area is 0.05mm-1mm, so that the effect of a reinforcing rib is formed, and the strength of the whole structure is enhanced.

[0017] As a preferred scheme of the utility model, the top of the shell welding area is provided with a shell welding point, the shell welding point is a laser welding track, the top of the tab welding area is provided with a tab welding point, the tab welding point is a laser welding track, the laser welding track is one of a point, a spiral line, a sine line, a straight line and an arc line, the shell welding point is a welding position of the shell welding area and a battery shell, and the tab welding point is a welding position of the tab welding area and a battery tab.

[0018] As a preferred scheme of the utility model, the number of the tab welding areas is greater than or equal to 2, and the tab welding areas are uniformly distributed along the radial direction, the liquid guide groove hole area is a hollow structure, the number of the liquid guide groove hole areas is greater than or equal to 2, and the liquid guide groove hole areas are uniformly distributed along the radial direction, so that the function of the structure can be enhanced.

[0019] As a preferred scheme of the utility model, the D-shaped hole of the liquid guide groove hole area is D-shaped and is rotationally distributed and uniformly oriented, the positions where the boss, the shell welding area and the tab welding area intersect are each provided with a fillet transition, the thickness of the lithium ion battery current collector main body is greater than or equal to 0.1mm and less than or equal to 0.5mm, the D-shaped hole can not only guide liquid but also prevent the reaction, after the current collector is turned over, the holes before and after the turning over cannot completely coincide, and the current collector is prevented from being placed upside down during welding. Advantageous effects

[0020] 1. The large-area boss in the middle of the shell welding area is beneficial to supporting the roll core, preventing the edge warping of the shell welding area, reducing the gap between the shell and the lithium ion battery current collector main body, and improving the welding stability.

[0021] 2. The design of the liquid guide groove hole area ensures that the concave area of the liquid guide groove hole area is reduced under the condition of the same welding area, the contact surface pressure of the tab is increased, the tab is better attached, and the welding stability is improved;

[0022] 3. The tab welding area is uniformly distributed along the radial direction of the circle, which is beneficial to the uniform flow of the current in the battery roll core and shortens the current flow distance;

[0023] 4. The boss of the lithium ion battery current collector main body and the side wall of the concave boss of the liquid guide groove hole area act as a reinforcing rib, which can improve the strength of the lithium ion battery current collector main body, the boss and the concave boss are staggered, so that reinforcing ribs exist in all directions of the lithium ion battery current collector main body, the bending resistance of the lithium ion battery current collector main body is improved, the lithium ion battery current collector main body is not easy to deform, and the welding stability is improved;

[0024] 5. The hollow design of the liquid guide groove hole area is beneficial to improving the efficiency of electrolyte injection and increasing the electrolyte infiltration speed;

[0025] 6. The design of the D-shaped hole liquid guide groove can not only guide the liquid, but also prevent the reverse action. After the lithium ion battery current collector main body is turned over, the holes before and after the turning cannot completely coincide, so that the lithium ion battery current collector main body is prevented from being placed in reverse during welding;

[0026] 7. The shell welding area is arranged at the edge, the welding circle diameter is maximized, the welding area is larger than the center welding, the battery overcurrent energy is improved, the battery internal resistance is reduced, and the rate performance is improved;

[0027] In the utility model, through the design of the boss, the shell welding area and the tab welding area, the edge warping of the shell welding area can be prevented, the gap between the shell and the lithium ion battery current collector main body is reduced, the welding stability is improved, the boss and the liquid guide groove hole area make the attachment better, the welding stability is improved, and the strength of the lithium ion battery current collector main body is also improved, and the reverse action is prevented. ACCOUT OF DRAWINGS

[0028] Figure 1 It is the overall perspective view of the utility model;

[0029] Figure 2 It is the lithium ion battery current collector main body perspective view of the utility model;

[0030] Figure 3 It is the current collector welding line schematic view of the utility model;

[0031] Figure 4 It is the penetration welding schematic view of the utility model.

[0032] In the drawing: 1, lithium ion battery current collector main body; 2, boss; 3, shell welding area; 4, tab welding area; 5, liquid guide groove hole area; 6, D-shaped hole; 7, shell welding point; 8, tab welding point. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. EMBODIMENT

[0034] Referring to Figures 1-4 A lithium ion battery current collecting disc comprises

[0035] A lithium ion battery current collecting disc body 1;

[0036] A boss 2 is arranged at the middle position of the top of the lithium ion battery current collecting disc body 1;

[0037] A shell welding area 3 is arranged at the outer side of the boss 2;

[0038] A tab welding area 4 is arranged at the gap of the boss 2;

[0039] A liquid guide groove hole area 5 is arranged at the bottom of the boss 2;

[0040] A D-shaped hole 6 is arranged at the inner side of the liquid guide groove hole area 5.

[0041] Through the design of the boss 2, the shell welding area 3 and the tab welding area 4, the edge of the shell welding area 3 can be prevented from warping, the gap between the shell and the lithium ion battery current collecting disc body 1 can be reduced, the welding stability can be improved, the boss 2 and the liquid guide groove hole area 5 can make the fit better and improve the welding stability, and the strength of the lithium ion battery current collecting disc body 1 can be improved, thereby preventing the reverse effect.

[0042] Referring to Figure 1 The lithium ion battery current collecting disc body 1 is a non-mirror-symmetrical structure, and the shell welding area 3 at the outer edge of the lithium ion battery current collecting disc body 1 is circular, so that the tightness of the fit can be ensured.

[0043] Referring to Figure 2 The shell welding area 3 is a circular plane, the boss 2 protrudes upward, the liquid guide groove hole area 5 is a downward recess, the depth of the liquid guide groove hole area 5 is 0.05mm-1mm, a reinforcing rib is formed, the bending resistance of the current collecting disc is improved, the current collecting disc is not easy to deform, and the welding stability is improved.

[0044] Referring to Figure 3The top of the shell welding area 3 is provided with a shell welding point 7, the shell welding point 7 is a laser welding track, the top of the tab welding area 4 is provided with a tab welding point 8, the tab welding point 8 is a laser welding track, the laser welding track is one of a point, a spiral line, a sine line, a straight line and an arc line, the shell welding point 7 is a welding position of the shell welding area 3 and a battery shell, and the tab welding point 8 is a welding position of the tab welding area 4 and a battery tab.

[0045] Please refer to Figure 3 The number of the tab welding area 4 is greater than or equal to 2, and the tab welding area 4 is uniformly distributed along the radial direction, the liquid guide groove hole area 5 is a hollow structure, the number of the liquid guide groove hole area 5 is greater than or equal to 2, and the liquid guide groove hole area 5 is uniformly distributed along the radial direction, the structure can be enhanced, the hollow design is beneficial to improve the electrolyte injection efficiency and increase the electrolyte infiltration speed.

[0046] Please refer to Figure 3 The D-shaped hole 6 of the liquid guide groove hole area 5 is a D-shaped hole, and is rotationally distributed and uniformly oriented, the positions where the boss 2, the shell welding area 3 and the tab welding area 4 intersect are each provided with a fillet transition, the thickness of the lithium ion battery current collector main body 1 is greater than or equal to 0.1 mm and less than or equal to 0.5 mm, the D-shaped hole 6 can not only guide liquid, but also prevent inversion, after the current collector is turned over, the holes before and after the turning over cannot completely coincide, and the current collector is prevented from being placed upside down during welding.

[0047] The working principle of the utility model is as follows: the boss 2 in the middle of the shell welding area 3 is beneficial to support the winding core of the battery, prevent the edge of the shell welding area 3 from warping, reduce the gap between the shell and the lithium ion battery current collector main body 1, improve the welding stability, the setting of the liquid guide groove hole area 5 can ensure that the concave area of the liquid guide groove hole area 5 is reduced under the condition of the same welding area, the contact surface pressure of the tab is increased, the tab is better attached, the welding stability is improved, the tab welding area 4 is uniformly distributed along the radial direction, which is beneficial to the uniform flow of the current in the battery winding core, shortens the current flow distance, the boss 2 of the lithium ion battery current collector main body 1 and the side wall of the concave area of the liquid guide groove hole area 5 play the role of reinforcing ribs, which can improve the strength of the lithium ion battery current collector main body 1, the structure of the boss 2 and the liquid guide groove hole area 5 makes the lithium ion battery current collector main body 1 have reinforcing ribs in each direction, improves the bending resistance of the lithium ion battery current collector main body 1, the lithium ion battery current collector main body 1 is not easy to deform, improves the welding stability, the hollow design of the liquid guide groove hole area 5 is beneficial to improve the electrolyte injection efficiency and increase the electrolyte infiltration speed, the liquid guide groove design of the D-shaped hole 6 can not only guide liquid, but also prevent inversion, after the lithium ion battery current collector main body 1 is turned over, the holes before and after the turning over cannot completely coincide, the lithium ion battery current collector main body 1 is prevented from being placed upside down during welding, the shell welding area 3 is arranged at the edge, the welding circle diameter is maximized, the welding area is larger than the center welding, the battery overcurrent energy is improved, the battery internal resistance is reduced, and the rate performance is improved.

[0048] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A lithium-ion battery current collector, characterized in that, include Lithium-ion battery current collector body (1); The boss (2) is located at the middle position of the top of the lithium-ion battery current collector body (1); Shell welding area (3), which is located on the outside of boss (2); The electrode welding area (4) is located in the gap of the boss (2); Liquid guiding groove hole area (5) is located at the bottom of boss (2); D-type hole (6) is located inside the liquid guide groove hole area (5).

2. A lithium-ion battery current collector according to claim 1, characterized in that, The lithium-ion battery current collector body (1) has a non-mirror symmetrical structure, and the outer edge of the lithium-ion battery current collector body (1) has a circular shell welding area (3).

3. A lithium-ion battery current collector according to claim 1, characterized in that, The shell welding area (3) is a circular plane, the boss (2) protrudes upward, the liquid guiding groove area (5) is a downward concave platform, and the depth of the liquid guiding groove area (5) is 0.05mm-1mm.

4. A lithium-ion battery current collector according to claim 1, characterized in that, The top of the shell welding area (3) is provided with a shell welding point (7), which is the trajectory of laser welding. The top of the electrode welding area (4) is provided with an electrode welding point (8), which is the trajectory of laser welding. The trajectory of laser welding is one of the following: dotted, spiral, sine, straight, or arc.

5. A lithium-ion battery current collector according to claim 1, characterized in that, The number of electrode welding areas (4) is ≥2 and they are evenly distributed along the diameter direction. The liquid guiding groove hole area (5) is a hollow structure with ≥2 holes and they are evenly distributed along the diameter direction.

6. A lithium-ion battery current collector according to claim 1, characterized in that, The D-shaped holes (6) in the liquid guiding groove hole area (5) are D-shaped and rotated, with a uniform orientation. The intersection of the boss (2), the shell welding area (3) and the electrode welding area (4) is provided with rounded corner transitions. The thickness of the lithium-ion battery current collector body (1) is ≥0.1mm and ≤0.5mm.

Images