Pre-pressing mechanism for sealing detection of battery pack

Abstract

The utility model relates to a pre-pressing mechanism for battery pack sealing detection, which comprises a fixed frame, a driving structure and a pressing plate, the driving structure is fixed on the fixed frame and positioned above a battery pack pre-pressing station, the driving structure is in driving connection with the pressing plate, and the mechanism also comprises a floating structure which is fixed on the fixed frame and positioned above the battery pack pre-pressing station. The floating structure comprises a first rotating base, a rotating shaft base and a second rotating base; a first rotating shaft and a second rotating shaft which are perpendicular to each other are fixed on the rotating shaft base, the first rotating base and the second rotating base are of hole digging plate structures, the first rotating base is fixed on the driving structure, the first rotating shaft is rotatably connected with the first rotating base, the second rotating base is fixed on the pressing plate, and the second rotating shaft is rotatably connected with the second rotating base. Compared with the prior art, the floating structure is used for adaptively adjusting the contact between the pressing plate and the battery pack, so that the pre-pressing efficiency and quality of the battery pack are high, and the like.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, and in particular to a pre-pressing mechanism for battery pack seal detection. Background Art

[0002] Air tightness is a basic requirement for lithium-ion battery packs. Therefore, during the production process of battery pack boxes or the whole packs, air tightness is required to be detected at 100%. This requires the design of air tightness detection tooling for battery pack boxes.

[0003] Currently, during the closed detection process of battery packs, pre-pressing treatment is usually not carried out, or workers use hand-held clamps to perform pre-pressing treatment on the battery packs. However, for this kind of battery pack without pre-pressing treatment or manual pre-pressing treatment method, the pressing effect of the battery pack is not good and the pressing efficiency is low, resulting in low production efficiency and easy deformation of the battery pack's shape. Against the background of the increasing production line capacity and the continuous increase in labor costs, traditional operations can no longer meet the requirements, and there is an urgent need for technological transformation to meet the development needs.

[0004] For example, the utility model with the publication number CN217331497U discloses a downward pressing tooling for the air tightness test of a power battery pack, including: a support frame; a lifting drive module; a downward pressing bracket fixedly connected to the output end of the lifting drive module; a lower pressing plate; a pressing block with a vertical shaft provided upward; a first limiting member provided at the top end of the vertical shaft; the vertical shaft is vertically movably connected to the downward pressing bracket or the lower pressing plate, and the bottom surface of the pressing block protrudes from the bottom surface of the lower pressing plate; a return spring sleeved on the vertical shaft, with the bottom end abutting against the pressing block and the top end abutting against the downward pressing bracket or the lower pressing plate; a detection device fixed to the downward pressing bracket or the lower pressing plate and used to detect whether the first limiting member reaches a predetermined overpressure protection position when the vertical shaft moves upward.

[0005] However, for the above-mentioned existing pre-pressing mechanism, the lower pressing plate is directly driven by the drive module to press the battery pack, without considering the shape and position of the battery pack, and it cannot make adaptive adjustments according to the inclination or shape error of the battery pack, and it is easy to cause the deformation of the battery pack's shape. Summary of the Utility Model

[0006] The purpose of the present utility model is to overcome the defect that the above-mentioned existing technology directly presses the battery pack by driving the lower pressing plate through a driving structure and cannot make adaptive adjustments according to the position or shape error of the battery pack, resulting in the deformation of the battery pack's shape, and to provide a pre-pressing mechanism for battery pack seal detection.

[0007] The purpose of the present utility model can be achieved through the following technical solutions:

[0008] A pre - pressing mechanism for battery pack airtight detection, comprising a fixed frame, a driving structure and a pressing plate. The driving structure is fixed on the fixed frame and is located above the pre - pressing station of the battery pack. The driving structure is drivingly connected to the pressing plate. The mechanism further includes a floating structure, and the floating structure includes a first rotating base, a rotating shaft base and a second rotating base;

[0009] A first rotating shaft and a second rotating shaft perpendicular to each other are fixed on the rotating shaft base. Both the first rotating base and the second rotating base are perforated plate structures. The first rotating base is fixed on the driving structure, the first rotating shaft is rotatably connected to the first rotating base, the second rotating base is fixed on the pressing plate, and the second rotating shaft is rotatably connected to the second rotating base.

[0010] Preferably, the floating structure further includes a first support plate. A first card slot matching the first rotating shaft is provided on the first support plate. The first support plate is fixed on the first rotating base. The first support plate is located above the first rotating shaft, and the upper end of the first rotating shaft abuts against the first card slot.

[0011] Preferably, the floating structure further includes a second support plate. A second card slot matching the second rotating shaft is provided on the second support plate. The second support plate is fixed on the second rotating base. The second support plate is located below the second rotating shaft, and the lower end of the second rotating shaft abuts against the second card slot.

[0012] Preferably, the driving structure includes a servo - cylinder, an electric cylinder fixing frame and a transition plate;

[0013] The electric cylinder fixing frame is fixed on the fixed frame. The servo - cylinder is fixed on the electric cylinder fixing frame. The transition plate is connected to the piston of the servo - cylinder. The transition plate is located below the electric cylinder fixing frame. The first rotating base is fixed on the side of the transition plate away from the servo - cylinder.

[0014] Preferably, the driving structure further includes a first cylinder and a second cylinder. Both the first cylinder and the second cylinder are fixed on the electric cylinder fixing frame. The pistons of the first cylinder and the second cylinder are both drivingly connected to the transition plate. The first cylinder and the second cylinder are symmetrically distributed on both sides of the servo - cylinder.

[0015] Preferably, the driving structure further includes a guiding member, and the guiding member includes a guiding rod and a guiding cylinder;

[0016] A guiding through - hole is provided on the electric cylinder fixing frame. The guiding cylinder passes through the guiding through - hole and is fixed on the electric cylinder fixing frame. One end of the guiding rod is fixed on the side of the transition plate close to the electric cylinder fixing frame, and the other end is slidably inserted into the guiding cylinder.

[0017] Preferably, the number of the guiding members is multiple, and the guiding members are symmetrically distributed around the servo cylinder. A synchronous plate is provided at one end of the guiding member away from the transition plate, and the synchronous plate is respectively connected to each guiding member.

[0018] Preferably, the driving structure further includes a limit bolt. A threaded hole is provided on the transition plate, and the limit bolt is rotatably fixed on the transition plate, and the other end of the limit bolt contacts the pressing plate.

[0019] Preferably, the number of the limit bolts is multiple, and one ends of the limit bolts close to the pressing plate are located in the same plane, and the limit bolts are symmetrically distributed around the transition plate.

[0020] Preferably, a distance sensor is provided on the pressing plate, and the number of the distance sensors is multiple, and the distance sensors are symmetrically distributed on both sides of the pressing plate.

[0021] Compared with the prior art, the utility model has the following advantages:

[0022] (1) In this solution, the battery pack is moved to the pre-pressing station, and the driving structure drives the floating structure and the pressing plate to move downward and approach the battery pack. After the pressing plate contacts the battery pack, according to the position or the shape of the upper end surface of the battery pack, the first rotating shaft rotates relative to the first rotating base, and the pressing plate and the rotating shaft base rotate, or the second rotating base rotates relative to the second rotating shaft, driving the pressing plate to rotate, adjusting the contact situation between the pressing plate and the battery pack, and then the driving structure drives the pressing plate to perform pre-pressing treatment on the battery pack.

[0023] Through the cooperation of the first rotating shaft and the first rotating base, the pressing plate and the rotating shaft base rotate as a whole around the first direction, and the second rotating base cooperates with the second rotating shaft to make the pressing plate rotate around the second direction perpendicular to the first direction. Thus, the pressing plate can adjust the inclination angle adaptively according to the upper end surface situation of the battery pack. Through the tolerance compensation of the floating structure, the fitting contact between the pressing plate and the battery pack is ensured, and the adjustment is flexible and highly accurate, which can effectively avoid the problem of deformation of the battery pack after pre-pressing caused by the position error of the battery pack, and improve the accuracy and safety of pre-pressing.

[0024] (2) In this solution, the first cylinder and the second cylinder are symmetrically arranged on both sides of the servo cylinder to assist the servo cylinder in pressing the pressing plate, and cooperate with the transition plate and the floating structure to synchronize the piston actions of the cylinder and the cylinder, ensuring uniform force on the pressing plate, thereby further improving the pre-pressing effect of the battery pack; on the other hand, the moving direction of the transition plate is guided by the guiding member, and each guiding rod is connected by the synchronous plate to ensure the synchronism of the movement of the guiding rod and improve the accuracy of the transition movement, further improving the pre-pressing effect of the battery pack. Description of the Drawings

[0025] Figure 1Structural schematic diagram of the battery pack pre - pressing mechanism provided by the present utility model;

[0026] Figure 2 Structural schematic diagram of the pre - pressing mechanism provided by the present utility model fixed on the fixed frame;

[0027] Figure 3 Structural schematic diagram of the driving structure provided by the present utility model;

[0028] Figure 4 is Figure 1 Partial enlarged view of position A in

[0029] In the figure: 1. Fixed frame, 2. Driving structure, 3. Pressure plate, 4. Floating structure, 5. Limit bolt; 21. Servo electric cylinder, 22. Electric cylinder fixing frame, 23. Transition plate, 24. First cylinder, 25. Second cylinder, 26. Guide, 27. Guide rod, 28. Guide cylinder, 29. Synchronization plate; 31. Distance sensor; 41. First rotating base, 42. Rotating shaft base, 43. Second rotating base, 44. First rotating shaft, 45. Second rotating shaft, 46. First support plate, 47. Second support plate. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0032] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0034] It should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0035] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0036] Embodiment 1

[0037] As Figure 1 and Figure 2 shown, this embodiment provides a pre-pressing mechanism for battery pack airtight detection, including a fixed frame 1, a driving structure 2 and a pressing plate 3. The driving structure 2 is fixed on the fixed frame 1 and is located above the battery pack pre-pressing station. The driving structure 2 is drivingly connected to the pressing plate 3. The mechanism further includes a floating structure 4, and the floating structure 4 includes a first rotating base 41, a rotating shaft base 42 and a second rotating base 43;

[0038] A first rotating shaft 44 and a second rotating shaft 45 perpendicular to each other are fixed on the rotating shaft base 42. Both the first rotating base 41 and the second rotating base 43 are perforated plate structures. The first rotating base 41 is fixed on the driving structure 2, the first rotating shaft 44 is rotatably connected to the first rotating base 41, the second rotating base 43 is fixed on the pressing plate 3, and the second rotating shaft 45 is rotatably connected to the second rotating base 43.

[0039] Working principle: Move the battery pack to the pre-pressing station. The driving structure 1 drives the floating structure 4 and the pressing plate 3 to move downward to approach the battery pack. After the pressing plate 3 contacts the battery pack, according to the position or the shape of the upper end face of the battery pack, the first rotating shaft 44 rotates relative to the first rotating base 41, and the pressing plate 3 and the rotating shaft base 42 rotate, or the second rotating base 43 rotates relative to the second rotating shaft 45 to drive the pressing plate 3 to rotate, adjusting the contact situation between the pressing plate 3 and the battery pack. Then, the driving structure 2 drives the pressing plate to perform pre-pressing treatment on the battery pack.

[0040] Through the cooperation of the first rotating shaft 44 and the first rotating base 41, the pressing plate 3 and the rotating shaft base 42 rotate as a whole around the first direction, and the second rotating base 43 cooperates with the second rotating shaft 45 to make the pressing plate 3 rotate around the second direction perpendicular to the first direction. Thus, the pressing plate 3 can adjust the inclination angle adaptively according to the upper end face situation of the battery pack. Through the tolerance compensation of the floating structure 4, it is ensured that the pressing plate is in close contact with the battery pack, with flexible adjustment and high precision, effectively avoiding the problem of battery pack deformation after pre-pressing caused by the position error of the battery pack, and improving the accuracy and safety of pre-pressing.

[0041] Preferred implementation mode, such as Figure 3 As shown, the floating structure 4 further includes a first support plate 46. A first card slot matching the first rotating shaft 44 is provided on the first support plate 46. The first support plate 46 is fixed on the first rotating base 41. The first support plate 46 is located above the first rotating shaft 44, and the upper end of the first rotating shaft 44 abuts against the first card slot.

[0042] Among them, the floating structure 4 further includes a second support plate 47. A second card slot matching the second rotating shaft 45 is provided on the second support plate 47. The second support plate 47 is fixed on the second rotating base 43. The second support plate 47 is located below the second rotating shaft 45, and the lower end of the second rotating shaft 45 abuts against the second card slot.

[0043] By providing the first support plate 46 on the first rotating base 41 and arranging the first support plate 46 at the upper end of the first rotating shaft 44, the contact area between the first rotating shaft 44 and the first rotating base 41 is increased. Similarly, by providing the second support plate 47 on the second rotating base 43 and arranging the second support plate 47 at the lower end of the second rotating shaft 45, the contact area between the second rotating shaft 45 and the second support plate 47 is increased. It can effectively improve the stability of the rotating shaft connection and the reliability of the floating structure for compensating tolerance.

[0044] Preferred implementation mode, such as Figure 4 As shown, the driving structure 2 includes a servo electric cylinder 21, an electric cylinder fixing frame 22 and a transition plate 23;

[0045] The electric cylinder fixing bracket 22 is fixed on the fixed frame 1, the servo electric cylinder 21 is fixed on the electric cylinder fixing bracket 22, the transition plate 23 is connected to the piston of the servo electric cylinder 21, the transition plate 23 is located below the electric cylinder fixing bracket 22, and the first rotating base 41 is fixed on the side of the transition plate 23 away from the servo electric cylinder 21.

[0046] Specifically, the driving structure 2 further includes a first air cylinder 24 and a second air cylinder 25. Both the first air cylinder 24 and the second air cylinder 25 are fixed on the electric cylinder fixing bracket 22. The pistons of the first air cylinder 24 and the second air cylinder 25 are both drivingly connected to the transition plate 23. The first air cylinder 24 and the second air cylinder 25 are symmetrically distributed on both sides of the servo electric cylinder 21.

[0047] Furthermore, the driving structure 2 further includes a guiding member 26. The guiding member 26 includes a guiding rod 27 and a guiding cylinder 28;

[0048] The electric cylinder fixing bracket 22 is provided with a guiding through hole. The guiding cylinder 28 passes through the guiding through hole and is fixed on the electric cylinder fixing bracket 22. One end of the guiding rod 27 is fixed on the side of the transition plate 23 close to the electric cylinder fixing bracket 22, and the other end is slidably inserted into the guiding cylinder 28.

[0049] Even further, the number of the guiding members 26 is multiple. Each guiding member 26 is symmetrically distributed around the servo electric cylinder 21. A synchronous plate 29 is provided at one end of the guiding member 26 away from the transition plate 23. The synchronous plate 29 is respectively connected to each guiding member 26.

[0050] The first air cylinder and the second air cylinder are symmetrically arranged on both sides of the servo electric cylinder, assisting the servo electric cylinder to press the pressing plate, and cooperating with the transition plate and the floating structure to synchronize the piston actions of the electric cylinder and the air cylinder, ensuring uniform force on the pressing plate, thereby further improving the pre-pressing effect of the battery pack; on the other hand, guiding the moving direction of the transition plate through the guiding member, and connecting each guiding rod with the synchronous plate to ensure the synchronism of the movement of the guiding rod, improving the accuracy of the transition movement, and further improving the pre-pressing effect of the battery pack.

[0051] Optionally, the driving structure 2 further includes a limit bolt 5. The transition plate 23 is provided with a threaded hole. The limit bolt 5 is rotatably fixed on the transition plate 23. The other end of the limit bolt 5 contacts the pressing plate 3. The number of the limit bolts 5 is multiple. One end of each limit bolt 5 close to the pressing plate 3 is located in the same plane. Each limit bolt 5 is symmetrically distributed around the transition plate 23.

[0052] By arranging a plurality of limit bolts 5 between the transition plate 23 and the pressing plate 3, the rotation range of the pressing plate 3 along each rotating shaft is phased to ensure the stability of the floating structure.

[0053] Among them, a distance sensor 31 is provided on the pressing plate 3, and the number of the distance sensors 31 is multiple. Each distance sensor 31 is symmetrically distributed on both sides of the pressing plate 3. By arranging the distance sensors 31 on both sides of the pressing plate 3, the distances between both sides of the pressing plate 3 and the battery pack are detected. Through the specific comparison and feedback on both sides, the flatness of the pressing plate 3 and the pre-pressing effect of the battery pack are assisted in judgment.

[0054] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A pre-pressing mechanism for battery pack airtightness detection, comprising a fixed frame (1), a driving structure (2) and a pressing plate (3), wherein the driving structure (2) is fixed on the fixed frame (1) and is located above a battery pack pre-pressing station, and the driving structure (2) drives the connecting pressing plate (3), characterized in that: The mechanism further comprises a floating structure (4), wherein the floating structure (4) comprises a first rotating base (41), a rotating shaft base (42) and a second rotating base (43); A first rotating shaft (44) and a second rotating shaft (45) which are perpendicular to each other are fixed on the rotating shaft base (42); the first rotating base (41) and the second rotating base (43) are both perforated plate structures; the first rotating base (41) is fixed on the driving structure (2); the first rotating shaft (44) is rotatably connected to the first rotating base (41); the second rotating base (43) is fixed on the pressing plate (3); and the second rotating shaft (45) is rotatably connected to the second rotating base (43).

2. A pre-pressing mechanism for battery pack airtightness detection according to claim 1, characterized in that: The floating structure (4) further comprises a first support plate (46), the first support plate (46) being provided with a first slot matched with the first rotating shaft (44), the first support plate (46) being fixed on the first rotating base (41), the first support plate (46) being located above the first rotating shaft (44), and the upper end of the first rotating shaft (44) being against the first slot.

3. A pre-pressing mechanism for battery pack airtightness detection according to claim 1, characterized in that: The floating structure (4) further comprises a second support plate (47), the second support plate (47) being provided with a second slot matched with the second rotating shaft (45), the second support plate (47) being fixed on the second rotating base (43), the second support plate (47) being located below the second rotating shaft (45), and the lower end of the second rotating shaft (45) being against the second slot.

4. A pre-pressing mechanism for battery pack airtightness detection according to claim 1, characterized in that: The driving structure (2) comprises a servo electric cylinder (21), an electric cylinder fixing frame (22) and a transition plate (23); The electric cylinder fixing frame (22) is fixed on the fixing frame (1), the servo electric cylinder (21) is fixed on the electric cylinder fixing frame (22), the transition plate (23) is connected to the piston of the servo electric cylinder (21), the transition plate (23) is located below the electric cylinder fixing frame (22), and the first rotating base (41) is fixed on a side of the transition plate (23) away from the servo electric cylinder (21).

5. A pre-pressing mechanism for battery pack airtightness detection according to claim 4, characterized in that: The driving structure (2) further comprises a first cylinder (24) and a second cylinder (25), wherein the first cylinder (24) and the second cylinder (25) are both fixed on the electric cylinder fixing frame (22), the pistons of the first cylinder (24) and the second cylinder (25) are both driven to connect the transition plate (23), and the first cylinder (24) and the second cylinder (25) are symmetrically distributed on both sides of the servo electric cylinder (21).

6. A pre-pressing mechanism for battery pack airtightness detection according to claim 4, characterized in that: The driving structure (2) further comprises a guide member (26), wherein the guide member (26) comprises a guide rod (27) and a guide cylinder (28); The electric cylinder fixing frame (22) is provided with a guide through hole, the guide tube (28) passes through the guide through hole and is fixed on the electric cylinder fixing frame (22), one end of the guide rod (27) is fixed to a side of the transition plate (23) close to the electric cylinder fixing frame (22), and the other end is slidably inserted in the guide tube (28).

7. A pre-pressing mechanism for battery pack airtightness detection according to claim 6, characterized in that: There are a plurality of guide members (26), each guide member (26) is symmetrically distributed around a circumference of the servo electric cylinder (21), and a synchronization plate (29) is provided at one end of the guide member (26) away from the transition plate (23), and the synchronization plate (29) is respectively connected to each guide member (26).

8. A pre-pressing mechanism for battery pack airtightness detection according to claim 4, characterized in that: The driving structure (2) further comprises a limiting bolt (5), a threaded hole is provided on the transition plate (23), the limiting bolt (5) can be rotatably fixed on the transition plate (23), and the other end of the limiting bolt (5) contacts the pressure plate (3).

9. A pre-pressing mechanism for battery pack airtightness detection according to claim 8, characterized in that: The number of the limiting bolts (5) is large, and one end of each limiting bolt (5) close to the pressure plate (3) is located in the same plane, and each limiting bolt (5) is symmetrically distributed around the transition plate (23).

10. A pre-pressing mechanism for battery pack airtightness detection according to claim 1, characterized in that: The pressing plate (3) is provided with a distance sensor (31), and there are a plurality of distance sensors (31), each distance sensor (31) being symmetrically distributed on both sides of the pressing plate (3).

Images