A cylindrical battery tab welding positioning assembly

Abstract

The utility model discloses a cylindrical battery current collecting plate welding positioning assembly, including bottom plate, be provided with stroke cylinder fixed plate on bottom plate through support plate, the stroke cylinder fixed plate bottom is installed stroke cylinder, and the stroke cylinder fixed plate is linked with rotary cylinder fixed base through guide pillar guide bush structure, be provided with rotary cylinder on rotary cylinder fixed base, and rotary cylinder is linked with the mechanical jaw of electricity core through connecting plate, and the mechanical jaw of electricity core is cooperated with pre -pressing jaw, and the battery that the mechanical jaw of electricity core clamped the current collecting plate of waiting to weld is placed in the battery fixed groove on the top of battery fixed base, and pre -pressing jaw sets up battery top, and battery fixed base sets up on the connecting fixed plate, and connecting fixed plate sets up on the bottom plate through the increase high pole. The utility model discloses through " mechanical positioning + pneumatic drive + pre -tightening fixed " design, has realized the automation accurate positioning in cylindrical battery current collecting plate welding process, has effectually promoted welding efficiency and quality stability, and compact structure, and strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, specifically to a cylindrical battery current collector welding and positioning assembly. Background Technology

[0002] With the increasing demands for energy density, safety, and cycle life of power batteries from markets such as electric vehicles and energy storage systems, cylindrical lithium-ion batteries have become one of the mainstream battery types. In the structural design of cylindrical batteries, the reliability and electrical performance of the terminal (current collector) connections have a crucial impact on the overall performance of the entire battery pack.

[0003] 1. Resistance and energy loss problem The positive and negative electrode tabs (current collectors) of a cylindrical battery are connected to the battery top cover terminals by ultrasonic welding or laser welding to achieve efficient current conduction. If the welding position is off or the weld quality is unstable, it will lead to increased contact resistance, resulting in additional I²R loss. The battery is also prone to overheating during high-rate charging and discharging, further accelerating the aging of electrode materials and reducing cycle life.

[0004] 2. Challenges to mechanical reliability and safety.

[0005] During battery assembly and subsequent use, batteries must withstand various loads such as vibration, drops, and thermal expansion and contraction. If the current collector welding area is not accurately positioned or the weld strength is insufficient, it may become loose, disconnected, or experience stress concentration, leading to internal circuit breaks or short circuits. At the same time, localized high-temperature electric arcs may also cause thermal runaway, which can lead to battery safety accidents in severe cases.

[0006] 3. Production consistency and automation Currently, large-scale production lines mostly use robotic arms or multi-station platforms for loading, welding, and inspecting current collectors. Due to the shape and elasticity of the current collectors and workpiece clamping errors, there are often slight deviations in the relative position between the welding head and the current collector, leading to fluctuations in weld quality. The lack of high-precision, repeatable positioning devices makes it impossible to meet the dual requirements of welding position accuracy (±0.1mm level) and production cycle time (≤1s / piece) in mass production.

[0007] 4. Shortcomings of existing technology Existing patents mostly focus on improvements to welding head structures or station switching devices. Pre-welding workpiece positioning relies on simple mechanical stops or cylinder clamping, and positioning accuracy is easily affected by workpiece dimensional tolerances and changes in clamping force. Furthermore, manual adjustment or calibration is required when switching stations, resulting in low automation and a difficulty in balancing production efficiency and accuracy. This fails to fully meet the stringent requirements of high-performance, high-reliability batteries in the new energy vehicle and energy storage sectors.

[0008] In summary, there is an urgent need for a new type of cylindrical battery current collector welding and positioning assembly that features high positioning accuracy, high repeatability, and ease of automated integration, in order to improve weld consistency, reduce resistance loss, enhance mechanical reliability, and meet the cycle time requirements of large-scale production lines. Utility Model Content

[0009] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a cylindrical battery current collector welding positioning component. The component has a reasonable structural design and achieves automated and precise positioning during the welding process of cylindrical battery current collectors through a design of "mechanical positioning + pneumatic drive + pre-tightening fixation". This effectively improves welding efficiency and quality stability. At the same time, it has the characteristics of compact structure and strong adaptability, making it suitable for large-scale production scenarios.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a cylindrical battery current collector welding and positioning assembly, comprising a base plate, a stroke cylinder fixing plate mounted on the base plate via a support plate, a stroke cylinder mounted at the bottom of the stroke cylinder fixing plate, the stroke cylinder fixing plate being connected to a rotary cylinder fixing seat via a guide post and guide sleeve structure, a rotary cylinder mounted on the rotary cylinder fixing seat, the rotary cylinder being connected to a cell mechanical gripper via a connecting plate, the cell mechanical gripper engaging with a pre-clamping gripper, the cell mechanical gripper holding the battery with the current collector to be welded and placing it in the battery fixing groove at the top of the battery fixing base, the pre-clamping gripper being positioned above the battery, the battery fixing base being mounted on a connecting fixing plate, and the connecting fixing plate being mounted on the base plate via an extension rod.

[0011] Preferably, the stroke cylinder fixing plate is provided with a limit post.

[0012] Preferably, the pre-compression jaws are positioned above the battery to pre-compress it.

[0013] The beneficial effects of this utility model are: 1. High positioning accuracy and stable welding quality The rigid fit between the mechanical grippers and the battery fixing slot, combined with the pre-tightening effect of the pre-clamping grippers, enables precise alignment of the battery and the current collector, reducing the risk of welding misalignment. The limiting post and guide post / sleeve structure further enhances the stability of mechanical movement and ensures consistent welding trajectory.

[0014] 2. High degree of automation and integration, improving production efficiency. The rotary cylinder works in conjunction with the stroke cylinder to automate the gripping, transfer and placement of battery cells, reducing manual intervention; the external robotic arm and the clamping module work together to form a continuous process of "picking up - positioning - placement - welding", shortening the process time.

[0015] 3. Compact structure and strong adaptability The components are integrated onto the base plate via an extension rod and a connecting fixing plate, resulting in a compact layout and saving equipment space. The fixing groove design of the battery fixing base can be adjusted according to the battery model, making it suitable for welding current collectors of different specifications of cylindrical batteries.

[0016] 4. Safe and reliable operation The dual fixation of mechanical grippers and pre-clamping grippers avoids problems such as incomplete or missing welds caused by battery shaking during the welding process; the limit design of the stroke cylinder prevents damage to components due to over-stroke, thus improving the safety of equipment operation. Attached Figure Description

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments; Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] Reference Figure 1 The specific embodiment adopts the following technical solution: a stroke cylinder fixing plate 3 is provided, a stroke cylinder 4 is installed at the bottom of the stroke cylinder fixing plate 3, the stroke cylinder fixing plate 3 is connected to the rotary cylinder fixing seat 6 through the guide post and guide sleeve structure 5, a rotary cylinder 7 is provided on the rotary cylinder fixing seat 6, the rotary cylinder 7 is connected to the cell mechanical gripper 9 through the connecting plate 8, the cell mechanical gripper 9 cooperates with the pre-compression gripper 10, the cell mechanical gripper 9 clamps the battery with the current collector A to be welded and places it in the battery fixing groove at the top of the battery fixing base 11, the pre-compression gripper 10 is set above the battery, the battery fixing base 11 is set on the connecting fixing plate 12, and the connecting fixing plate 12 is set on the base plate 1 through the raising rod 13.

[0020] It is worth noting that a limit post 31 is provided on the stroke cylinder fixing plate 3.

[0021] In addition, the pre-compression gripper 10 is located above the battery to pre-compress it.

[0022] The working principle of this specific embodiment is as follows: The rotary cylinder 7 drives the mechanical gripper 9 of the battery cell to rotate to the material picking position through the connecting plate 8, and picks up the battery with the current collector A to be welded; the stroke cylinder 4 drives the rotary cylinder fixing seat 6 and the gripper assembly to rise and fall as a whole through the guide post and guide sleeve structure 5, and moves the battery into the battery fixing slot of the battery fixing base 11. The pre-clamping gripper 10 is located above the battery and pre-clamps it after the battery is placed in the fixing slot to prevent the battery from shifting during the welding process. The external robot places the current collector in the welding area of ​​the battery, and then the clamping module (not shown) presses down to further fix the relative position of the current collector and the battery. The laser equipment welds the current collector to the battery tab / casing through a preset path to complete the electrical connection. The limiting post 31 on the stroke cylinder fixing plate 3 limits the lifting stroke to ensure the accuracy of the battery placement position; the guide post and guide sleeve structure 5 ensures a smooth lifting process and avoids the battery cell shifting.

[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A welding and positioning assembly for current collectors of a cylindrical battery, characterized in that, The system includes a base plate (1), on which a stroke cylinder fixing plate (3) is provided via a support plate (2). A stroke cylinder (4) is installed at the bottom of the stroke cylinder fixing plate (3). The stroke cylinder fixing plate (3) is connected to a rotary cylinder fixing seat (6) via a guide post and guide sleeve structure (5). A rotary cylinder (7) is provided on the rotary cylinder fixing seat (6). The rotary cylinder (7) is connected to a cell mechanical gripper (9) via a connecting plate (8). The cell mechanical gripper (9) cooperates with a pre-clamping gripper (10). The cell mechanical gripper (9) clamps the battery with the current collector (A) to be welded and places it in the battery fixing groove at the top of the battery fixing base (11). The pre-clamping gripper (10) is located above the battery. The battery fixing base (11) is located on a connecting fixing plate (12). The connecting fixing plate (12) is located on the base plate (1) via a heightening rod (13).

2. The cylindrical battery current collector welding and positioning assembly according to claim 1, characterized in that, Limit pins (31) are provided on the stroke cylinder fixing plate (3).

3. The cylindrical battery current collector welding and positioning assembly according to claim 1, characterized in that, The pre-compression jaws (10) are located above the battery to pre-compress it.

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