Battery PACK pressure maintaining tool

Abstract

The utility model discloses a battery PACK pressure maintaining tool, which belongs to the technical field of batteries and comprises a cuboid base plate, a limiting plate and a counterweight plate, a plurality of supporting prisms are laid on the upper end face of the base plate, the middle of the upper end of the base plate is connected with the counterweight plate through the limiting plate, a rectangular hole is formed in the middle of the counterweight plate, and the bottom of the limiting plate is fixedly connected with the supporting prisms. The upper end of the limiting plate is fixedly connected with the balance weight plate through a connecting block, base plates are laid at the upper ends of the two opposite edges of the base plate, the same edges of the base plates and the base plate are symmetrically provided with a pair of U-shaped mounting grooves with outward openings, and balance weight plug pin assemblies capable of being overturned up and down are arranged in the U-shaped mounting grooves. The counterweight bolt assembly which can be turned over and adjusted up and down is arranged at the edge of the pressure maintaining tool, so that the requirement of different PACKs for applying pressure to the upper cover can be met by adjusting the supporting and height adjusting piece up and down when an airtight test is performed on the PACK.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a battery PACK pressure holding tool. Background Technology

[0002] The battery pack system of an electric vehicle, with its ingenious mechanical structure design, connects numerous individual battery cells in a precise series-parallel configuration. Utilizing an integrated battery management system (BMS) and communication frame technology, it establishes a seamless information exchange bridge with the electric vehicle's microcontroller (MCU). To maximize the utilization efficiency of the vehicle's interior space, the battery pack is often cleverly embedded in the chassis or under the vehicle body. While this saves space, it also exposes the pack to the complex and ever-changing external environment. Given the diversity of automotive operating conditions and the harshness of the environment, implementing efficient and comprehensive protection strategies for the battery is particularly important.

[0003] Currently, the assembly structure design of lithium-ion battery packs is quite complex. When the battery pack casing faces the risk of deformation, the careful design of the battery pressure-holding structure is crucial to effectively mitigate potential battery damage or even explosion hazards caused by localized impacts. With the booming electric vehicle market, the application of power battery packs is becoming increasingly widespread. After assembly, conducting airtightness testing to obtain accurate airtightness data has become an indispensable step. During airtightness testing, to prevent data distortion due to pack expansion, specialized pressure-holding fixtures are needed to effectively constrain expansion and ensure a constant test volume. However, existing fixture solutions based on steel frames installed during testing, while meeting the need to limit pack expansion to some extent, are limited in their application scope and efficiency due to the need for manual installation, on-site height adjustment, and limited versatility.

[0004] Existing technologies disclose some patents for battery module pressure-holding fixtures. Chinese utility model patent CN219383201U discloses a battery module pressure-holding and positioning tray. By setting movable pressure components, it can press modules of different lengths. The side plate pressure components enable pressure-holding and positioning around the module. During the assembly and production of the PACK battery pack, after a series of key processes, the top cover needs to be pressed and pressure-held to ensure that the internal structure of the PACK battery pack is not contaminated, maintain its airtightness, and ensure a tight fit between the top cover and the module. However, when conducting airtightness tests on the PACK, there are still issues that cannot meet the requirements of different types of PACKs regarding whether pressure should be applied to the top cover and how the pressure can be adjusted, and problems remain regarding its inconvenience for storage, machine handling, and installation. Utility Model Content

[0005] To overcome the limitations of existing technologies that cannot meet the requirements of different types of PACKs regarding whether pressure is applied to the top cover and how the pressure can be adjusted, as well as the inconvenience of storage and machine handling and installation, this utility model provides a battery PACK pressure-holding fixture. The fixture includes a cuboid pad, a limiting plate, and a counterweight plate. Several supporting prisms are laid on the upper surface of the pad. The counterweight plate is positioned at the center of the upper surface of the pad via the limiting plate, and the center of the counterweight plate has a rectangular hole. The bottom of the limiting plate is fixedly connected to the supporting prisms, and the upper surface of the limiting plate is fixedly connected to the counterweight plate via a connecting block. A base plate is laid on the upper edge of each of the two opposite edges of the pad. A pair of outward-facing U-shaped mounting grooves are symmetrically formed on the same edge of both the base plate and the pad. A counterweight pin assembly that can be flipped up and down is installed within the U-shaped mounting groove.

[0006] A counterweight pin assembly that can be flipped up and down is used at the edge of the pressure-holding fixture. When performing airtightness testing on the PACK, the support height adjustment component can be freely adjusted up and down to adapt to the pressure requirements of different types of PACKs on the top cover, and to meet the needs of the battery PACK pressure-holding fixture and the different height limits on the upper and lower sides.

[0007] Furthermore, the counterweight pin assembly includes two U-shaped mounting seats, a positioning pin, and a support shaft. The mounting seats are fixedly installed on the two opposite edges of the U-shaped mounting groove. Each of the two mounting seats has a horizontally opened connecting hole. The two ends of the support shaft pass through the corresponding connecting holes, and the support shaft is rotatably fixed to the connecting holes. The positioning pin is fixedly sleeved on the middle of the support shaft. The mounting seat is provided with a pin limiting member on the side opposite to the opening of the U-shaped mounting groove to restrict the up-and-down rotation of the positioning pin.

[0008] With the above technical solution, mounting seats are installed at the two opposite edges of the U-shaped mounting groove. The two ends of the support shaft are respectively mounted on the mounting seats at the two opposite edges of the U-shaped mounting groove to provide support for fixing the positioning pin. The positioning pin is sleeved in the middle of the support shaft. When the positioning pin needs to rotate up and down, the two ends of the support shaft can be rotated relative to the connecting hole by holding the positioning pin and lifting it up and down. In order to prevent the positioning pin from shaking back and forth in the U-shaped mounting groove, which would cause the connection between the positioning pin and other components to be unstable, a pin limiting member is set at the closed end of the U-shaped mounting groove.

[0009] Furthermore, the pin limiting component includes a fixed base, a limiting base, and a limiting rod. The fixed base and the limiting base are respectively installed on the two mounting bases. One end of the limiting rod is rotatably connected to the fixed base, and the other end is engaged with the limiting base.

[0010] Through the above technical solution, a fixed seat and a limiting seat are installed on the bottom surface of the convex mounting base. The limiting rod is rotated and fixed inside the fixed seat so that the limiting rod rotates around the fixed seat between the two mounting bases and is engaged with the limiting seat. When it is necessary to rotate the positioning pin up and down, the limiting rod is lifted and placed vertically. After the rotation is completed, its free end is engaged with the limiting seat to limit the positioning pin and prevent it from rotating freely, thus ensuring its stability.

[0011] Furthermore, the pressure-holding fixture also includes a tray placed below the pad, and a support and height adjustment component is fixedly provided at the edge of the upper surface of the tray corresponding to the positioning pin, and the positioning pin abuts against the support and height adjustment component.

[0012] Furthermore, the height adjustment support includes a support and a height adjustment component. The height adjustment component is provided with an adjustment platform with a stepped height distribution, and the adjustment platform abuts against the support.

[0013] Furthermore, the free end of the positioning pin is provided with an inverted conical abutment, which is integrally connected to the positioning pin and abuts against the support height adjustment component.

[0014] By using the above technical solution, an inverted conical abutment is integrally connected to the bottom of the positioning pin, which allows the positioning pin to better contact and connect with the support height adjustment component. While ensuring the counterweight of the positioning pin, it can also better abut against the support height adjustment component, ensuring a stable connection between the two.

[0015] Furthermore, an I-shaped support seat is symmetrically arranged on the upper surface of the pad near the limiting rod, and a buffer pad is fixedly provided on the upper end of the I-shaped support seat.

[0016] Furthermore, the pressure-holding fixture also includes several body plates, which are laid at equal intervals on the bottom of the pad.

[0017] By using the above technical solution, laying several body plates at the bottom of the pad can improve the overall counterweight and weight uniformity of the pressure holding fixture.

[0018] Furthermore, each of the two free ends of the support shaft is fixedly provided with a limiting ring, and each side of the positioning pin is provided with a limiting block, and the limiting block is fixedly connected to the support shaft.

[0019] By using the above technical solution, limiting rings and limiting blocks are respectively set at the two free ends and the middle of the support shaft around the two ends of the positioning pin, which can prevent the positioning pin from moving left and right during use, and also make the connection between the support shaft and the mounting base more stable.

[0020] The beneficial effects of adopting the technical solution of this utility model are as follows:

[0021] (1) The pressure-holding fixture in this solution is innovatively designed with an upward stackable structure, which greatly facilitates the storage, machine gripping and installation process. When performing airtightness testing on the PACK, the specific pressure required for different types of PACKs to be applied to the top cover can be adjusted by flipping the positioning pins up and down. It is particularly worth mentioning that the counterweight plate is designed with a rectangular hole (i.e., a square ring) in the middle. This unique design not only enhances the stability of the structure, but also greatly facilitates the machine gripping and installation operation.

[0022] (2) This tooling is cleverly designed with a locating pin that can be flipped up and down. When the locating pin is in the lower position, it fits tightly with the sleeve and support on the tray, so that the pressure holding tooling and the PACK are kept at an appropriate distance to provide a limiting function without pressing the PACK cover. When the locating pin is raised to the upper position, the tooling can be directly and firmly pressed on the PACK, which is suitable for scenarios where continuous pressure needs to be applied to the PACK cover.

[0023] (3) The pressure-holding fixture of this application not only significantly reduces production costs and manpower input, but also greatly improves production efficiency and PACK yield. Its flip-top design of the positioning pin greatly enhances the flexibility and efficiency of production, meeting the needs of modern production lines for diversified and efficient production. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a battery PACK pressure holding tool and tray according to the present invention;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the installation of a battery PACK pressure-holding fixture and tray according to this utility model;

[0029] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6This is a schematic diagram of the installation of the support and height adjustment component of a battery PACK pressure holding fixture according to this utility model.

[0031] Figure 7 This is a schematic diagram of the support and height adjustment component structure of a battery PACK pressure holding fixture according to this utility model;

[0032] In the diagram, 1. Pad; 2. Limiting plate; 3. Counterweight plate; 4. Support prism; 5. Connecting block; 6. U-shaped mounting groove; 7. Counterweight pin assembly; 8. Mounting seat; 9. Positioning pin; 10. Support shaft; 11. Connecting hole; 12. Fixed seat; 13. Limiting seat; 14. Limiting rod; 15. Tray; 16. Support height adjustment component; 17. Abutment component; 18. I-shaped support seat; 19. Buffer pad; 20. Body plate; 21. Limiting ring; 22. Limiting block; 23. Base; 24. Support seat; 25. Sleeve; 26. Adjusting rod; 27. Arc-shaped adjustment channel; 28. Arc-shaped adjustment plate; 29. ​​Auxiliary plate; 30. Height adjustment platform; 31. Rotating fixed axis; 32. Adjusting handle; 33. Limiting through hole; 34. Pin hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0034] The pressure-holding fixture used in this embodiment has a stackable structure for easy storage and machine handling and installation. During airtightness testing of the PACK, the height of the support base can be freely adjusted vertically to accommodate the pressure requirements of different PACKs on the top cover. Simultaneously, the design of the support base, sleeve, and annular height selector can meet the limiting needs of PACKs of different heights, making adjustment simple and convenient. The specific implementation method is as follows:

[0035] like Figure 1-6As shown, a battery pack pressure holding fixture includes a rectangular pad 1, a limiting plate 2, and a counterweight plate 3. The upper surface of the pad 1 is covered with several supporting prisms 4. The counterweight plate 3 is placed in the middle of the upper end of the pad 1 through the limiting plate 2. The middle of the counterweight plate 3 has a rectangular hole. The bottom of the limiting plate 2 is fixedly connected to the supporting prisms 4. The upper end of the limiting plate 2 is fixedly connected to the counterweight plate 3 through a connecting block 5. The upper ends of the two opposite edges of the pad 1 are covered with substrates. A pair of U-shaped mounting grooves 6 with outward openings are symmetrically opened on the same edge of the substrate and the pad 1. The U-shaped mounting grooves 6 are provided with counterweight pin assemblies 7 that can be flipped up and down.

[0036] Here, a counterweight pin assembly 7 that can be flipped up and down is used at the edge of the pressure-holding fixture. When the PACK is tested for air tightness, the support height adjustment component 16 can be freely adjusted up and down to adapt to the pressure requirements of different types of PACKs on the top cover, and to meet the needs of the battery PACK pressure-holding fixture and the different height limits on the upper and lower sides.

[0037] In a preferred embodiment, the counterweight pin assembly 7 includes two U-shaped mounting seats 8, a positioning pin 9, and a support shaft 10. The mounting seats 8 are fixedly installed on the two opposite edges of the U-shaped mounting groove 6. Each mounting seat 8 has a horizontally opened connecting hole 11. The two ends of the support shaft 10 pass through the corresponding connecting hole 11, and the support shaft 10 is rotatably fixed to the connecting hole 11. The positioning pin 9 is fixedly sleeved in the middle of the support shaft 10. The mounting seat 8 is provided with a pin limiting member on the side opposite to the opening of the U-shaped mounting groove 6 to limit the up and down rotation of the positioning pin 9.

[0038] Here, mounting seats 8 are installed at the two opposite edges of the U-shaped mounting groove 6. The two ends of the support shaft 10 are respectively mounted on the mounting seats 8 at the two opposite edges of the U-shaped mounting groove 6 to provide support for fixing the positioning pin 9. The positioning pin 9 is sleeved in the middle of the support shaft 10. When the positioning pin 9 needs to rotate up and down, the two ends of the support shaft 10 can be rotated relative to the connecting hole 11 by holding the positioning pin 9 up and down. In order to prevent the positioning pin 9 from shaking back and forth in the U-shaped mounting groove 6, so as to make the connection between the positioning pin 9 and other components unstable, a pin limiting member is provided at the closed end of the U-shaped mounting groove 6.

[0039] In a preferred embodiment, the pin limiting component includes a fixed seat 12, a limiting seat 13, and a limiting rod 14. The fixed seat 12 and the limiting seat 13 are respectively installed on two mounting seats 8. One end of the limiting rod 14 is rotatably connected to the fixed seat 12, and the other end is engaged with the limiting seat 13.

[0040] Here, a fixed seat 12 and a limiting seat 13 are installed on the bottom surface of the convex mounting base 8. The limiting rod 14 is rotated and fixed inside the fixed seat 12 so that the limiting rod 14 rotates around the fixed seat 12 between the two mounting bases 8 and is engaged with the limiting seat 13. When it is necessary to rotate the positioning pin 9 up and down, the limiting rod 14 is lifted and placed vertically. After the rotation is completed, its free end is engaged with the limiting seat 13 to limit the positioning pin 9 so that it cannot rotate freely and ensures its stability.

[0041] In a preferred embodiment, the pressure holding fixture also includes a tray 15 placed below the pad 1. A support and height adjustment component 16 is fixedly provided at the edge of the upper surface of the tray 15 corresponding to the positioning pin 9, and the positioning pin 9 abuts against the support and height adjustment component 16.

[0042] Here, a support height adjustment component 16 is provided on the upper end of the tray 15. The distance between the pad 1 and the tray 15 can be adjusted by the support height adjustment component 16 when needed. When the PACK is inflated for air tightness testing, a pressure holding fixture is added to the PACK to limit the expansion and keep its volume constant.

[0043] In a preferred embodiment, the height adjustment support 16 includes a support and a height adjustment component. The height adjustment component is provided with an adjustment platform with a stepped height distribution, and the adjustment platform abuts against the support.

[0044] Here, a counterweight pin assembly 7 and a support height adjustment component 16 are set at the connection between the pressure holding fixture and the tray 15 to cooperate with each other. When performing airtightness testing on the PACK, the height of the support height adjustment component 16 can be adjusted as needed to adapt to the pressure requirements of different types of PACKs on the top cover, and to meet the limit requirements of PACKs of different heights.

[0045] Here, the support includes a base 23 fixedly connected to the upper end of the tray 15, a support seat 24, and a sleeve 25 slidably connected to the support seat 24. The sleeve 25 is fixedly installed on the upper end of the base 23. An adjusting rod 26 is fixedly installed in the middle of the bottom surface of the support seat 24. The adjusting rod 26 passes through the upper end surface of the sleeve 25 and is placed inside the sleeve 25. An arc-shaped adjusting channel 27 is vertically opened in the middle of the sleeve body. A height adjustment component is provided on the upper end surface of the base 23 corresponding to the arc-shaped adjusting channel 27. The height adjustment component includes an arc-shaped adjustment plate 28, an auxiliary plate 29 integrally connected to the adjustment plate, and a height adjustment platform 30. The radius lines of the auxiliary plate 29 and the arc-shaped adjustment plate 28 coincide. The free end of the auxiliary plate 29 is rotatably connected to the base 23 via a rotating fixed axis 31. An adjustment handle 32 is installed on the arc-shaped adjustment plate 28 close to the auxiliary plate 29. The height adjustment platform 30 is fixedly located on the upper surface of the arc-shaped adjustment plate 28 away from the adjustment handle 32 and abuts against the adjustment rod 26. The upper surface of the base 23 is connected to the base via a rotating fixed axis. 31 has several adjustment holes on the rotation trajectory of the fixed point handle. The adjustment handle 32 passes through the auxiliary plate 29 and abuts against the adjustment holes. The height of the height adjustment platform 30 decreases in a stepped manner from the free end of the arc-shaped adjustment plate 28 to the rotation fixed axis 31. A limit through hole 33 is vertically opened on the adjustment rod 26. The limit through hole 33 horizontally passes through the rod body of the adjustment rod 26. A pin hole 34 is opened at the upper end of the sleeve 25 corresponding to the limit through hole 33. A pin is provided through the pin hole 34 and the limit through hole 33.

[0046] In a preferred embodiment, the free end of the positioning pin 9 is provided with an inverted conical abutment 17, which is integrally connected to the positioning pin 9 and abuts against the support height adjustment member 16.

[0047] Here, an inverted conical abutment 17 is integrally connected to the bottom of the positioning pin 9, which allows the positioning pin 9 to better contact and connect with the support height adjustment component 16. While ensuring the counterweight of the positioning pin 9, it can also better abut against the support height adjustment component 16, ensuring the stable connection between the two.

[0048] In a preferred embodiment, an I-shaped support seat 18 is symmetrically arranged on the upper surface of the pad 1 near the limiting rod 14, and a buffer pad 19 is fixedly provided on the upper end of the I-shaped support seat 18.

[0049] Here, the I-shaped support seat 18 is provided on the upper end of the pad 1 to facilitate the support of the upper stacked pressure holding fixtures, and the buffer pad 19 is provided on the upper end of the I-shaped support seat 18 to avoid wear when supporting the upper stacked pressure holding fixtures and to increase friction.

[0050] In a preferred embodiment, the pressure-holding fixture further includes a plurality of body plates 20, which are laid at equal intervals on the bottom of the pad 1.

[0051] Here, several body plates 20 are laid at the bottom of the pad 1, which can improve the overall counterweight and weight uniformity of the pressure holding fixture.

[0052] In a preferred embodiment, both free ends of the support shaft 10 are fixedly provided with limiting rings 21, and both sides of the positioning pin 9 are provided with limiting blocks 22, and the limiting blocks 22 are fixedly connected to the support shaft 10.

[0053] Here, limiting rings 21 and limiting blocks 22 are respectively set at the two free ends and the middle of the support shaft 10 around the two ends of the positioning pin 9, which can prevent the positioning pin 9 from moving left and right during use, and also make the connection between the support shaft 10 and the mounting base 8 more stable.

[0054] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack pressure holding fixture, characterized in that, The pressure-holding fixture includes a cuboid pad (1), a limiting plate (2), and a counterweight plate (3). The upper surface of the pad (1) is covered with several supporting prisms (4). The counterweight plate (3) is placed in the middle of the upper part of the pad (1) through the limiting plate (2). The middle part of the counterweight plate (3) is a rectangular hole. The bottom of the limiting plate (2) is fixedly connected to the supporting prisms (4). The upper end of the limiting plate (2) is fixedly connected to the counterweight plate (3) through a connecting block (5). The upper ends of the two opposite edges of the pad (1) are covered with substrates. A pair of U-shaped mounting grooves (6) with outward openings are symmetrically opened on the same edge of the substrate and the pad (1). The U-shaped mounting grooves (6) are provided with counterweight pin assemblies (7) that can be flipped up and down.

2. The battery PACK pressure holding fixture according to claim 1, characterized in that, The counterweight pin assembly (7) includes two U-shaped mounting seats (8), a positioning pin (9), and a support shaft (10). The mounting seats (8) are fixedly installed on the two opposite edges of the U-shaped mounting groove (6). Both mounting seats (8) are provided with connecting holes (11) laterally. The two ends of the support shaft (10) pass through the corresponding connecting holes respectively, and the support shaft (10) is rotatably fixed with the connecting holes. The positioning pin (9) is fixedly sleeved in the middle of the support shaft (10). The mounting seat (8) is provided with a pin limiting member on the side away from the opening of the U-shaped mounting groove (6) to limit the up and down rotation of the positioning pin (9).

3. The battery pack pressure holding fixture according to claim 2, characterized in that, The pin limiting component includes a fixed seat (12), a limiting seat (13) and a limiting rod (14). The fixed seat (12) and the limiting seat (13) are respectively installed on the two mounting seats (8). One end of the limiting rod (14) is rotatably connected to the fixed seat (12), and the other end is snapped into the limiting seat (13).

4. The battery PACK pressure holding fixture according to claim 2, characterized in that, The pressure-holding fixture also includes a tray (15) placed below the pad (1). A support and height adjustment component (16) is fixedly provided at the edge of the upper surface of the tray (15) corresponding to the positioning pin (9). The positioning pin (9) abuts against the support and height adjustment component (16).

5. The battery PACK pressure holding fixture according to claim 4, characterized in that, The height adjustment component (16) includes a support component and a height adjustment component. The height adjustment component is provided with an adjustment platform with a stepped height distribution, and the adjustment platform abuts against the support component.

6. The battery pack pressure holding fixture according to claim 4, characterized in that, The free end of the positioning pin (9) is provided with an inverted conical abutment (17), the abutment (17) is integrally connected with the positioning pin (9), and the abutment (17) abuts against the support height adjustment member (16).

7. A battery pack pressure holding fixture according to claim 2, characterized in that, An I-shaped support seat (18) is provided on the same side as the positioning pin (9) on the upper end of the pad (1), and a buffer pad (19) is fixedly provided on the upper end of the I-shaped support seat (18).

8. The battery pack pressure holding fixture according to claim 1, characterized in that, The pressure-holding fixture also includes several body plates (20), which are laid at equal intervals on the bottom of the pad (1).

9. A battery pack pressure holding fixture according to claim 2, characterized in that, Both free ends of the support shaft (10) are fixedly provided with limiting rings (21), and both sides of the positioning pin (9) are provided with limiting blocks (22), and the limiting blocks (22) are fixedly connected to the support shaft (10).

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