Collector plate of cylindrical lithium ion battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cylindrical lithium ion battery collector plate which comprises a main body mechanism, the main body mechanism comprises a battery collector plate body, and a collector plate shell welding area is fixedly arranged in the middle of the upper end of the battery collector plate body. A collector plate limiting ring area is fixedly arranged at the outer end of the upper end of the battery collector plate body, the collector plate limiting ring area is located on the outer side of the collector plate shell welding area, and a collector plate tab welding area is fixedly arranged at the upper end of the battery collector plate body. According to the cylindrical lithium ion battery collector plate, the collector plate shell welding area is in a boss design, close contact with the shell is facilitated, contact internal resistance and gaps are reduced, the collector plate shell welding area is in a boss embossing design, close contact with the shell is further facilitated, the contact internal resistance and gaps are reduced, and the welding stability is improved; and the liquid guide groove hole area of the collector plate is hollowed out, so that the electrolyte injection efficiency is improved, and the electrolyte infiltration speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical lithium-ion battery current collecting disk. Background Art

[0002] Cylindrical batteries are widely used in smart furniture, power tools, two-wheeled electric vehicles and other fields because of their small size, high mechanical strength, good safety, and the fact that the battery volume will not expand or deform during use. Power tools, two-wheeled electric vehicles, etc. require batteries with both high capacity and high power capabilities to meet the needs of cruising range, charging speed, and high-power discharge.

[0003] Full-ear tab cylindrical batteries are an extremely effective way to improve the rate performance of cylindrical batteries. They are made by setting positive and negative full-ear tabs at both ends of the core. To ensure welding quality, the flexible ears need to be squeezed, flattened or patted to fit on both ends of the core. This will cause the ears to block the passage for the electrolyte to enter the core, and the flexible ears are prone to rebound deformation, resulting in poor welding stability between the collector plate, the ears and the shell. At the same time, the collector plate further blocks the passage for the electrolyte to enter the core, resulting in even lower injection efficiency.

[0004] Therefore, we provide a cylindrical lithium-ion battery current collector. Utility Model Content

[0005] The utility model aims to provide a cylindrical lithium-ion battery collector disc to solve the problems of poor welding stability and low liquid injection efficiency of the existing battery collector discs mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cylindrical lithium-ion battery collector tray, comprising a main body mechanism, the main body mechanism comprising a battery collector tray body, a collector tray shell welding area is fixedly arranged in the middle of the upper end of the battery collector tray body;

[0007] A current collecting disc limiting ring area is fixedly arranged at the outer end of the upper end of the battery current collecting disc body, and the current collecting disc limiting ring area is located outside the current collecting disc shell welding area.

[0008] Preferably, the upper end of the battery collector plate body is evenly distributed with a collector plate lug welding area, the collector plate lug welding area is located in the middle of the collector plate shell welding area and the collector plate limiting ring area, the outer edge of the collector plate body is circular, and the outer diameter of the collector plate is ≤ the inner diameter of the shell, the number of the lug welding areas is ≥ 2, and they are evenly distributed along the circular diameter direction, the width of the lug welding area gradually increases in the direction away from the center of the circle, and the shape can be trapezoidal, fan-shaped, triangular, eight-shaped, etc.

[0009] Preferably, the upper end of the battery current collecting disc body is evenly distributed with current collecting disc liquid guiding slot hole areas, and the intersection positions of all adjacent areas are provided with rounded corner transitions.

[0010] Preferably, the collecting plate liquid guide slot hole area is located in the middle of the collecting plate shell welding area and the collecting plate limiting ring area, the collecting plate liquid guide slot hole area and the collecting plate pole ear welding area are cross-distributed, and the intersection positions of all adjacent areas are provided with rounded transitions.

[0011] Preferably, a welding point structure is fixedly arranged inside the welding area of ​​the current collecting disk pole tab, and the number of welding point structures inside each group of the welding area of ​​the current collecting disk pole tab is two groups.

[0012] Preferably, a welding wire structure is fixedly arranged inside the welding area of ​​the current collecting plate pole tab, and the number of welding wire structures inside each group of welding wire structures in the welding area of ​​the current collecting plate pole tab is two.

[0013] Preferably, the welding area of ​​the collecting plate shell has a boss, the boss protrudes in a direction close to one side of the shell, and the depth of the boss is 0.05-1 mm.

[0014] Preferably, the collector plate pole ear welding area has a concave platform, the concave platform is concave in a direction close to the winding core pole ear side, and the depth of the concave platform is 0.05-1mm.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The cylindrical lithium-ion battery collector plate has a convex design in the welding area of ​​the collector plate shell, which is conducive to close contact with the shell, reducing the contact internal resistance and gap. The collector plate shell welding area is a convex embossing design, which is further conducive to close contact with the shell, reducing the contact internal resistance and gap, and improving welding stability. The collector plate liquid guide slot hole area is hollowed out, which is conducive to improving the electrolyte injection efficiency and increasing the electrolyte infiltration speed;

[0017] 2. The cylindrical lithium-ion battery collector has a collector tab welding area that is evenly distributed along the circular diameter direction, which is beneficial to the uniform flow of current inside the battery core and shortens the current flow distance. The width of the collector tab welding area gradually increases in the direction away from the center of the circle, which is further beneficial to the uniform flow of current between the inner and outer circles of the core and shortens the current flow distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the plan view of the battery collector disc body (with embossing) and a structural diagram of the utility model;

[0020] Figure 3This is a schematic diagram of the structure of the battery collector disc body (without embossing) of the utility model;

[0021] Figure 4 This is a schematic diagram of the planar structure of the welding point structure of the utility model

[0022] Figure 5 It is a schematic diagram of the planar structure of the welding wire structure of the utility model.

[0023] In the figure: 1. Main body; 101. Battery collector plate body; 102. Collector plate shell welding area; 103. Collector plate limiting ring area; 104. Collector plate ear welding area; 105. Collector plate liquid guide slot hole area; 106. Welding point structure; 107. Welding wire structure. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 - Figure 5 The utility model provides a technical solution: a cylindrical lithium-ion battery collector disk, comprising a main body mechanism 1, the main body mechanism 1 comprises a battery collector disk body 101, and a collector disk shell welding area 102 is fixedly arranged in the middle of the upper end of the battery collector disk body 101;

[0026] A current collecting disc limiting ring area 103 is fixedly provided at the outer end of the upper end of the battery current collecting disc body 101 , and the current collecting disc limiting ring area 103 is located outside the current collecting disc shell welding area 102 .

[0027] Preferably, the outer edge of the battery current collecting disc body 101 is circular, and the outer diameter of the battery current collecting disc body 101 is less than or equal to the inner diameter of the shell.

[0028] Optionally, an extension handle is further provided on the edge of the battery current collecting plate body 101 for welding with the cover plate.

[0029] Preferably, the collecting plate shell welding area 102 has a boss, the boss protrudes in a direction close to one side of the shell, and the boss depth is 0.05-1 mm.

[0030] Optionally, the surface of the boss of the collecting plate housing welding area 102 is also embossed.

[0031] Furthermore, the welding between the collecting plate shell welding area 102 and the shell may be resistance welding, ultrasonic torque welding, laser welding or the like.

[0032] The upper end of the battery collector plate body 101 is fixedly and evenly provided with a collector plate pole lug welding area 104, which is located in the middle of the collector plate shell welding area 102 and the collector plate limiting ring area 103.

[0033] Preferably, the collector plate tab welding area 104 has a concave platform, the concave platform is concave in a direction close to the winding core tab side, and the depth of the concave platform is 0.05-1 mm.

[0034] Optionally, the concave surface of the current collecting plate tab welding area 104 is also subjected to chemical or mechanical treatment, such as pickling, alkali washing, electrochemical oxidation, electroplating, grinding, polishing, etc.

[0035] Furthermore, the welding between the collector plate tab welding area 104 and the tab is laser welding.

[0036] Preferably, the number of the collector plate tab welding areas 104 is ≥ 2 and they are evenly distributed along the circular diameter direction.

[0037] Preferably, the width of the collector plate tab welding area 104 gradually increases in a direction away from the center of the circle, and the shape may be a trapezoid, a fan, a triangle, an eight-shaped shape, or the like.

[0038] Optionally, the welding trajectory can be in the shape of a dot, a spiral, a sinusoidal line, a straight line, an arc, etc.

[0039] The upper end of the battery collector plate body 101 is fixedly and evenly provided with a collector plate liquid guide slot hole area 105, which is located in the middle of the collector plate shell welding area 102 and the collector plate limiting ring area 103, and the collector plate liquid guide slot hole area 105 is cross-distributed with the collector plate pole ear welding area 104.

[0040] Preferably, the collecting plate liquid guiding slot hole area 105 is of hollow design, with a number of ≥2 and evenly distributed along the circular diameter direction.

[0041] Optionally, the shape of the liquid guiding slot holes in the liquid guiding slot hole area 105 of the collecting plate may be circular, square, diamond, triangle, pentagon, fan-shaped, trapezoidal, etc.

[0042] Preferably, all intersections of adjacent regions are provided with rounded corner transitions.

[0043] Preferably, the thickness of the battery current collecting disc body 101 is ≥0.1 mm and ≤0.5 mm.

[0044] A welding point structure 106 is fixedly arranged inside the collector plate tab welding area 104, and the number of welding point structures 106 inside each group of collector plate tab welding areas 104 is two. A welding wire structure 107 is fixedly arranged inside the collector plate tab welding area 104, and the number of welding wire structures 107 inside each group of collector plate tab welding areas 104 is two.

[0045] Working principle: During the use of the battery collector plate body 101, the staff will, according to processing requirements, emboss the boss of the collector plate shell welding area 102, and then weld the collector plate shell welding area 102 to the shell, which can be resistance welding, ultrasonic torque welding or laser welding. According to the use requirements of the battery collector plate body 101, the concave platform of the collector plate pole ear welding area 104 is chemically or mechanically treated. The staff welds the welding wire structure 107 and the welding point structure 106, and then laser welds the collector plate pole ear welding area 104 to the pole ear. The collector plate liquid guide slot hole area 105 is hollowed out to improve the electrolyte injection efficiency and increase the electrolyte infiltration speed during the welding process of cylindrical lithium-ion batteries.

[0046] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A cylindrical lithium-ion battery current collector, comprising a main body (1), characterized in that: The main body structure (1) comprises a battery current collecting disc body (101), and a current collecting disc shell welding area (102) is fixedly arranged in the middle of the upper end of the battery current collecting disc body (101); A current collecting disc limiting ring area (103) is fixedly provided at the outer end of the upper end of the battery current collecting disc body (101), and the current collecting disc limiting ring area (103) is located outside the current collecting disc shell welding area (102); and current collecting disc pole lug welding areas (104) are evenly distributed at the upper end of the battery current collecting disc body (101), and the current collecting disc pole lug welding areas (104) are located in the middle of the current collecting disc shell welding area (102) and the current collecting disc limiting ring area (103).

2. A cylindrical lithium-ion battery current collector according to claim 1, characterized in that: The upper end of the battery current collecting disc body (101) is evenly distributed with current collecting disc liquid guiding slot hole areas (105).

3. A cylindrical lithium-ion battery current collector according to claim 2, characterized in that: The collecting plate liquid guide slot hole area (105) is located in the middle of the collecting plate shell welding area (102) and the collecting plate limiting ring area (103), and the collecting plate liquid guide slot hole area (105) and the collecting plate pole ear welding area (104) are cross-distributed.

4. A cylindrical lithium-ion battery current collector according to claim 1, characterized in that: A welding point structure (106) is fixedly arranged inside the current collecting plate pole tab welding area (104), and the number of welding point structures (106) inside each group of current collecting plate pole tab welding areas (104) is two groups.

5. A cylindrical lithium-ion battery current collector according to claim 1, characterized in that: A welding wire structure (107) is fixedly arranged inside the current collecting plate pole tab welding area (104), and the number of welding wire structures (107) inside each group of current collecting plate pole tab welding areas (104) is two groups.

6. A cylindrical lithium-ion battery current collector according to claim 1, characterized in that: The collector plate shell welding area (102) has a boss, the boss protrudes in a direction close to one side of the shell, and the boss depth is 0.05-1 mm.

7. A cylindrical lithium-ion battery current collector according to claim 1, characterized in that: The collector plate pole ear welding area (104) has a concave platform, the concave platform is concave in a direction close to one side of the winding core pole ear, and the depth of the concave platform is 0.05-1 mm.

Images