An assembly positioning device for cylindrical batteries

Abstract

The utility model discloses a kind of assembly positioning device of cylindrical battery, cylindrical battery includes roll core and cylindrical shell, cylindrical shell can be determined by assembly positioning device and set position, assembly positioning device includes: mounting plate;Center positioning rod, for along the axial insertion of roll core and the center hole of roll core to form positioning to roll core;First laser positioner, with first laser emission port;Second laser positioner, with second laser emission port;Displacement component, at least two in center positioning rod, first laser positioner and second laser positioner can be driven and move in first plane, so that the projection of center positioning rod and first laser emission port on first plane has first interval in first direction, the projection of second laser emission port and center positioning rod on first plane has second interval in second direction, wherein, the length of first interval matches the radius of roll core, the length of second interval matches the radius of cylindrical shell.

Description

Technical Field

[0001] This utility model relates to the field of cylindrical battery technology, and in particular to an assembly and positioning device for cylindrical batteries. Background Technology

[0002] As market demand for battery energy density continues to increase, the materials used in battery components are constantly being upgraded. Among these upgrades, anode materials are gradually shifting from traditional graphite to silicon-based materials with higher specific capacity. However, silicon-based materials exhibit significant volume expansion during charging and discharging, resulting in a substantial difference in the total thickness of the core between the assembled state and the fully charged state. In cylindrical batteries, this difference manifests as a smaller group margin during the assembly stage, meaning a smaller gap between the core and the casing after assembly.

[0003] In the assembly process of cylindrical batteries, a "lay-down welding" process is typically used to meet production cycle requirements, where the battery is placed horizontally for welding. This process easily leads to eccentricity of the core during assembly into the casing, meaning the core's axis tends to deviate from the central axis of the casing. The aforementioned insufficient margin in the assembly stage, combined with this core eccentricity problem, further results in uneven gap distribution between the core and the casing in the assembled cylindrical battery.

[0004] Uneven gap distribution can cause a series of problems during subsequent charge and discharge cycles of the battery. For example, if the gap is too small, the movable area of ​​the tabs is relatively small, which will lead to uneven stress on the core; if the gap is too large, the space reserved for the tabs is too large, which will repeatedly pull on the tabs during charge and discharge, causing the tabs to deform and break. Utility Model Content

[0005] To solve the above problems, this utility model provides an assembly and positioning device for cylindrical batteries.

[0006] This utility model discloses an assembly and positioning device for a cylindrical battery. The cylindrical battery includes a core and a cylindrical outer shell. The cylindrical outer shell can be positioned by the assembly and positioning device. The assembly and positioning device includes:

[0007] Mounting plate;

[0008] The center positioning rod, fixed to the mounting plate and perpendicular to the mounting plate, is used to be inserted into the center hole of the core along the axial direction of the core to position the core.

[0009] The first laser positioner has a first laser emission port from which laser light can be emitted, and the first laser emission port is oriented in the same direction as the extension of the central positioning rod.

[0010] The second laser positioner has a second laser emission port from which laser light can be emitted, and the direction of the second laser emission port is consistent with the extension direction of the central positioning rod.

[0011] The displacement component can move at least two of the central positioning rod, the first laser positioner, and the second laser positioner within a first plane, such that the projection of the central positioning rod onto the first plane is spaced apart in a first direction, and the projection of the second laser positioner onto the central positioning rod onto the first plane is spaced apart in a second direction.

[0012] The first plane is one or more planes perpendicular to the extension direction of the center positioning rod. The first direction and the second direction are consistent with the radial direction of the core. The length of the first interval matches the radius of the core, and the length of the second interval matches the radius of the cylindrical shell.

[0013] By adopting the above technical solution, the uneven gap distribution caused by the eccentric insertion of the core into the casing is effectively avoided, so that the stress generated by the volume expansion of the battery during subsequent charge and discharge cycles can be released evenly in all directions, effectively avoiding abnormal failure caused by excessive local stress.

[0014] Optionally, the central positioning rod, the first laser positioner, and the second laser positioner are mounted on the mounting plate, with the first plane being the plane on which the mounting plate is located.

[0015] Optionally, the assembly positioning device also includes rollers mounted on the bottom of the mounting plate, which can be moved by the rollers.

[0016] Optionally, the rollers are caster wheels, and / or the assembly positioning device also includes a locking structure mounted on the bottom of the mounting plate, the locking structure being able to prevent the rollers from moving.

[0017] Optionally, the center positioning rod, the first laser positioner, and the second laser positioner are all mounted on the front side of the mounting plate, which faces the core and the cylindrical housing.

[0018] Optionally, the center positioning rod is installed on the front of the mounting plate, and the first laser positioner and the second laser positioner are installed on the back of the mounting plate, which is made of transparent or semi-transparent material.

[0019] Optionally, the first direction and the second direction are the same.

[0020] Optionally, the cylindrical battery also includes a current collector, which is disposed at the end of the core along the axial direction of the core. The assembly positioning device also includes a clamping block, which is sleeved on the outer periphery of the central positioning rod and can slide along the extension direction of the central positioning rod to push the current collector and the end of the core to abut.

[0021] Optionally, the diameter of the center positioning rod is smaller than the diameter of the center hole of the core.

[0022] Optionally, the length of the center positioning rod inserted into the center hole of the core is less than or equal to the length of the core along its axial direction. Attached Figure Description

[0023] Figure 1 This invention presents a schematic diagram of the assembly positioning device and the cylindrical battery before assembly.

[0024] Figure 2 The diagram shows a left-side view of the mounting plate of this utility model.

[0025] Figure 3 This diagram shows the assembly positioning device and the assembled cylindrical battery in Embodiment 1 of this utility model.

[0026] Figure 4 Show Figure 3 A schematic diagram of the cross-sectional structure along the CC direction;

[0027] Figure 5 This diagram shows the structure of the assembled cylindrical battery in Comparative Example 1 of this invention.

[0028] (Symbol Explanation)

[0029] 10. Mounting plate, 11. Center positioning rod, 12. Clamping block, 13. First laser positioner, 131. First laser emission port, 14. Second laser positioner, 141. Second laser emission port, 20. Cylindrical housing, 201. Second outermost edge, 21. Core, 211. First outermost edge, 212. Center hole, 22. Collector plate, 221. Through hole, x. Axial direction of core, y. Radial direction, a. First direction, b. Second direction, R. Radius of cylindrical housing, r. Radius of core, d. Fixed spacing Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0031] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0035] refer to Figures 1-4 As shown, this utility model provides an assembly and positioning device for a cylindrical battery. The cylindrical battery includes a core 21 and a cylindrical outer shell 20. The cylindrical outer shell 20 can be positioned by the assembly and positioning device. The assembly and positioning device includes:

[0036] Mounting plate 10;

[0037] The center positioning rod 11, fixed to the mounting plate 10 and perpendicular to the mounting plate 10, is used for positioning along the axial direction of the core 21 (e.g., Figure 1 Insert the core 21 into the center hole 212 of the core 21 in the direction shown (x) to position the core 21.

[0038] The first laser positioner 13 has a first laser emission port 131 from which laser light can be emitted. The orientation of the first laser emission port 131 is consistent with the extension direction of the central positioning rod 11.

[0039] The second laser positioner 14 has a second laser emission port 141 from which laser light can be emitted. The orientation of the second laser emission port 141 is consistent with the extension direction of the central positioning rod 11.

[0040] The displacement assembly can move at least two of the central positioning rod 11, the first laser positioner 13, and the second laser positioner 14 within a first plane. Specifically, the displacement assembly can move the central positioning rod 11 and the first laser positioner 13 within the first plane, or it can move the central positioning rod 11 and the second laser positioner 14 within the first plane, or it can move the first laser positioner 13 and the second laser positioner 14 within the first plane, or it can move the central positioning rod 11, the first laser positioner 13, and the second laser positioner 14 within the first plane. This causes the projection of the central positioning rod 11 and the first laser emission port 131 onto the first plane in a first direction (e.g., ...). Figure 4 The second laser emission port 141 and the projection of the center positioning rod 11 on the first plane are in the second direction (e.g., direction a) having a first interval, and the projection of the second laser emission port 141 and the center positioning rod 11 on the first plane is in the second direction (e.g., direction a) having a first interval. Figure 4 The direction shown (b) has a second interval. Preferably, the displacement component drives the first laser positioner 13 and the second laser positioner 14 to move within the first plane, further ensuring positioning accuracy.

[0041] Wherein, the first plane is one or more planes perpendicular to the extending direction of the central positioning rod 11, the first direction (e.g. Figure 4 The directions shown are: direction a) and second direction (e.g.) Figure 4 The direction shown (b) is aligned with the radial direction of the core. The length of the first interval matches the radius r of the core, and the length of the second interval matches the radius R of the cylindrical shell. Further, the length of the first interval matches the radius r of the core, and the length of the second interval matches the radius R of the cylindrical shell. Even further, the length of the first interval is equal to the radius r of the core, and the length of the second interval is equal to the radius R of the cylindrical shell. In other words, the first laser emitted from the first laser emission port 131 is aligned with the core 21 radially (e.g., Figure 1 and Figure 2 The second laser emitted from the second laser emission port 141 is aligned with the second outermost 201 of the cylindrical housing 20 in the radial direction at the first outermost 211 in the direction y).

[0042] Specifically, this invention achieves initial positioning of the core 21 by inserting the central positioning rod 11 into the central hole 212 of the core along its axial direction. Next, the first laser positioner 13 and the second laser positioner 14 emit a first laser and a second laser, respectively, in the same direction as the extension of the central positioning rod 11. Subsequently, the displacement assembly moves the central positioning rod and at least two of the two laser positioners in a plane perpendicular to the central positioning rod 11, thereby forming a first interval matching the radius r of the core and a second interval matching the radius R of the cylindrical outer shell in the radial direction. Thus, the first laser can be accurately aligned with the first outermost point 211 of the core 21 in the radial direction, and the second laser is aligned with the second outermost point 201 of the cylindrical outer shell in the radial direction, thereby determining the fitting position of the cylindrical outer shell 20. This ensures that the cylindrical outer shell 20 and the core 21 maintain a fixed radial distance d in the assembled cylindrical battery, where the fixed distance d is the difference between the radius R of the cylindrical outer shell and the radius r of the core.

[0043] By adopting the above technical solution, the uneven gap distribution caused by the eccentric insertion of the core 21 into the casing can be effectively avoided. This allows the stress generated by the volume expansion of the battery during subsequent charge and discharge cycles to be released evenly in all directions, effectively preventing abnormal failures caused by excessive local stress. In addition, the cylindrical battery usually needs to be baked in the production process to remove moisture or volatile substances. The fixed gap d allows heat to be evenly transferred to all areas of the cylindrical battery. Residual moisture inside (such as moisture in the core) will be smoothly discharged outward from the gaps between the layers of the core 21 and between the core 21 and the cylindrical casing 20 in a uniform temperature field and spatial environment. This prevents moisture from accumulating due to narrow local spaces or excessively concentrated moisture evaporation due to excessive local spaces, thus avoiding problems such as battery bulging and electrolyte decomposition caused by residual moisture.

[0044] In some embodiments of this utility model, reference is made to Figure 2 As shown, the central positioning rod 11, the first laser positioner 13, and the second laser positioner 14 are mounted on the mounting plate 10, and the first plane is the plane where the mounting plate 10 is located.

[0045] By adopting the above technical solution, component positional offsets caused by dispersed installation can be avoided, facilitating the adjustment of the relative positions of the central positioning rod 11, the first laser positioner 13, and the second laser positioner 14, and reducing positioning deviations caused by factors such as vibration and external force interference. The first plane is the plane where the mounting plate 10 is located, eliminating the need for an additional independent reference plane. This eliminates reference calibration errors between different planes and quickly achieves accurate calibration of the first and second intervals, ensuring more reliable positioning of the first laser aligned with the outermost radial direction of the core and the second laser aligned with the outermost radial direction of the cylindrical shell. Furthermore, the integration of all three components onto the same mounting plate 10 facilitates pre-adjustment during assembly and component inspection during subsequent maintenance, eliminating the need for separate reference positioning of each component. This reduces the difficulty of device assembly and debugging time, further improving assembly efficiency and yield.

[0046] For example, the center positioning rod 11, the first laser positioner 13 and the second laser positioner 14 are all mounted on the front side of the mounting plate 10, which faces the core 21 and the cylindrical housing 20. This makes the entire device structure more compact and avoids problems such as cable tangling and inconvenient operation that may result from mounting the components on the back or side.

[0047] As another example, the central positioning rod 11 is mounted on the front of the mounting plate 10, and the first laser positioner 13 and the second laser positioner 14 are mounted on the back of the mounting plate 10. The mounting plate 10 is made of a transparent or semi-transparent material. Because the mounting plate 10 is transparent or semi-transparent, the laser beam can pass through without damage. At the same time, the first laser positioner 13 and the second laser positioner 14 are mounted on the back of the mounting plate 10 to avoid movement interference with the central positioning rod 11.

[0048] Furthermore, the first direction (e.g.) Figure 4 The directions shown are: direction a) and second direction (e.g.) Figure 4As shown in direction b), specifically, the radial distance between the first outermost 211 and the second outermost 201 is the fixed distance d. In other words, the projected intervals of the central positioning rod 11 and the first laser emission port 131 and the second laser emission port 141 can form a corresponding relationship in the same radial direction. There is no need to make independent adjustments in two different directions. The staff or the automated system only needs to focus on the distance calibration in a single direction to simultaneously confirm whether the first interval matching the radius r of the core and the second interval matching the radius R of the cylindrical shell are accurate. At the same time, it can quickly confirm that the core 21 and the cylindrical shell 20 are concentric during the assembly process, avoiding visual judgment errors caused by different directions and improving the accuracy and efficiency of concentricity calibration. In addition, the displacement component does not need to drive the relevant parts to move in two different directions. It only needs to complete the distance adjustment in a single direction, which reduces the motion dimension and control parameters of the displacement component, reduces the difficulty of mechanical structure design and the programming complexity of the control system, and also reduces the coordination error that may be caused by multi-directional adjustment, further ensuring positioning accuracy.

[0049] In some embodiments of this utility model, the assembly positioning device further includes rollers installed at the bottom of the mounting plate 10. The mounting plate 10 can be moved by the rollers. The movement of the mounting plate 10 can synchronously drive the movement of the central positioning rod 11, thereby the central positioning rod 11 drives the core 21 to move so that the cylindrical shell 21 is in the sleeve position, so that the core 21 and the cylindrical shell 21 maintain a fixed distance d after being inserted into the cylindrical shell 21.

[0050] Furthermore, the assembly positioning device also includes a locking structure installed at the bottom of the mounting plate 10. The locking structure can prevent the rollers from moving. Specifically, the locking mechanism can prevent the rollers from moving after the mounting plate 10 moves to the target position, ensuring that the mounting plate 10 and the center positioning rod 11 are stable during the assembly of the core 21 and the cylindrical housing 20. This avoids the core 21 from shifting due to accidental slippage of the rollers, ensuring the accuracy of the assembly spacing and concentricity, and reducing defective products caused by assembly deviations.

[0051] Furthermore, the rollers are omnidirectional rollers, which allow the mounting plate 10 to rotate 360° flexibly without being restricted by the direction of movement. The movement path can be flexibly adjusted according to the layout of the workstation and the placement of the cylindrical shell 20, which further improves the adaptability of the assembly positioning device in complex production environments, making the positioning of the core 21 and the cylindrical shell 20 more convenient and efficient, and indirectly reducing assembly time and costs.

[0052] In some embodiments of this utility model, the cylindrical battery further includes a current collector 22, which is disposed at the end of the winding core along the axial direction of the winding core.

[0053] Specifically, the current collector 22 is, for example, a negative current collector. Exemplarily, in this embodiment, the core 21 is a core after the positive and negative electrode tabs have been shaped. The center positioning rod 11 is inserted sequentially along the axial direction of the core into the through hole 221 of the current collector 22, the center hole of the core 21, and the through hole of the positive current collector to position the current collector 22, the core 21, and the positive current collector, facilitating the concentric fitting of the cylindrical outer shell 20 onto the outer periphery of the current collector 22, the core 21, and the positive current collector. Here, "shaping" refers to the mechanical processing of the metal conductive strips (i.e., tabs, typically divided into positive and negative tabs) extending from the core 21 to achieve a specific shape, angle, thickness, and surface flatness.

[0054] Furthermore, the assembly positioning device also includes a clamping block 12, which is sleeved on the outer periphery of the central positioning rod 11 and can slide along the extension direction of the central positioning rod 11 (i.e., the axial direction of the core) to push the ends of the collector plate 22 and the core 21 to abut, thereby avoiding problems such as poor welding connection and excessive resistance caused by the fitting gap, and ensuring the reliability of the electrical connection between the core 21 and the collector plate 22.

[0055] For example, after the positive current collector and the core 21 are welded, the center positioning rod 11 is inserted sequentially along the axial direction of the core into the through hole 221 of the current collector 22, the center hole of the core 21, and the through hole of the positive current collector to position the current collector 22, the core 21, and the positive current collector, so that the current collector 22, the core 21, and the positive current collector are installed in the cylindrical shell 20, that is, the cylindrical shell 20 is concentrically fitted around the outer periphery of the current collector 22, the core 21, and the positive current collector. After assembly, the core 21 and the cylindrical shell 20 maintain a fixed distance d in the radial direction, and the clamping block 12 pushes the current collector 22 and the core 21 to abut (e.g. Figure 3 (As shown), thus achieving the welding of the core 21 and the collector plate 22. After welding is completed, the center positioning rod 11 can be removed.

[0056] In some embodiments of this utility model, the diameter of the center positioning rod 11 is smaller than the diameter of the center hole 212 of the core 21, which facilitates the insertion of the center positioning rod 11 to achieve positioning, and also facilitates easy removal to reduce damage to other components, such as avoiding scratching and squeezing of the core 21.

[0057] Furthermore, the length of the center positioning rod 11 inserted into the center hole 212 of the core 21 is less than or equal to the length of the core 21 in the axial direction, which facilitates the insertion and removal of the center positioning rod 11.

[0058] The following will describe the implementation method in more detail.

[0059] Example 1

[0060] A cylindrical outer shell 20 with a radius of 23 mm is fitted onto the outer periphery of a core 21 with a radius of 22.3 mm using the aforementioned assembly and positioning device. The fixed radial distance d between the core 21 and the cylindrical outer shell 20 is 0.7 mm. Figure 3 The diagram shown is a schematic of the cylindrical battery assembled using an assembly positioning device in Example 1.

[0061] Comparative Example 1

[0062] The difference from Embodiment 1 is that the aforementioned assembly and positioning device is not used; instead, the core 21 is directly moved and inserted into the cylindrical outer casing 20 via grippers. Figure 5 The diagram shows a schematic of the cylindrical battery after assembly in Comparative Example 1.

[0063] Depend on Figure 3 and Figure 5 As can be seen, compared with Comparative Example 1, the cylindrical shell 20 of Example 1 is fitted onto the outer periphery of the core 21 by using the assembly and positioning device of this utility model, so that the gap between the core 21 and the cylindrical shell 20 in the assembled cylindrical battery is evenly distributed, so that the stress on the battery in all directions is relatively uniform after subsequent charging and discharging, avoiding abnormal failure of the battery due to excessive local stress.

[0064] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. An assembly and positioning device for a cylindrical battery, the cylindrical battery comprising a winding core and a cylindrical outer casing, characterized in that, The cylindrical outer shell can be positioned by the assembly positioning device, which includes: Mounting plate; A center positioning rod, fixed to the mounting plate and perpendicular to the mounting plate, is used to be inserted into the center hole of the core along the axial direction of the core to position the core. The first laser positioner has a first laser emission port from which laser light can be emitted, and the first laser emission port is oriented in the same direction as the extension direction of the central positioning rod. The second laser positioner has a second laser emission port from which laser light can be emitted, and the orientation of the second laser emission port is consistent with the extension direction of the central positioning rod. The displacement component can move at least two of the central positioning rod, the first laser positioner, and the second laser positioner within a first plane, such that the projection of the central positioning rod and the first laser emission port onto the first plane has a first distance in a first direction, and the projection of the second laser emission port and the central positioning rod onto the first plane has a second distance in a second direction. The first plane is one or more planes perpendicular to the extension direction of the central positioning rod. The first direction and the second direction are consistent with the radial direction of the core. The length of the first interval matches the radius of the core, and the length of the second interval matches the radius of the cylindrical shell.

2. The assembly and positioning device for a cylindrical battery as described in claim 1, characterized in that, The central positioning rod, the first laser positioner, and the second laser positioner are mounted on the mounting plate, and the first plane is the plane on which the mounting plate is located.

3. The assembly and positioning device for a cylindrical battery as described in claim 2, characterized in that, The assembly positioning device also includes rollers, which are mounted on the bottom of the mounting plate, and the mounting plate can be moved by the rollers.

4. The assembly and positioning device for a cylindrical battery as described in claim 3, characterized in that, The roller is a caster wheel, and / or the assembly positioning device further includes a locking structure installed on the bottom of the mounting plate, the locking structure being able to prevent the roller from moving.

5. The assembly and positioning device for a cylindrical battery as described in claim 1, characterized in that, The central positioning rod, the first laser positioner, and the second laser positioner are all mounted on the front side of the mounting plate, which faces the core and the cylindrical outer shell.

6. The assembly and positioning device for a cylindrical battery as described in claim 1, characterized in that, The central positioning rod is installed on the front of the mounting plate, and the first laser positioner and the second laser positioner are installed on the back of the mounting plate. The mounting plate is made of transparent or semi-transparent material.

7. The assembly and positioning device for a cylindrical battery as described in claim 1, characterized in that, The first direction and the second direction are the same.

8. The assembly and positioning device for a cylindrical battery as described in claim 1, wherein the cylindrical battery further comprises a current collector, the current collector being disposed at the end of the winding core along the axial direction of the winding core, characterized in that, The assembly positioning device further includes a clamping block, which is sleeved on the outer periphery of the central positioning rod and can slide along the extension direction of the central positioning rod to push the ends of the collector plate and the winding core to abut.

9. The assembly and positioning device for a cylindrical battery as described in claim 1, characterized in that, The diameter of the central positioning rod is smaller than the diameter of the central hole of the winding core.

10. The assembly and positioning device for a cylindrical battery as described in claim 1, characterized in that, The length of the center positioning rod inserted into the center hole of the core is less than or equal to the length of the core along its axial direction.

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