Anti-loose electrical connection battery pack

Abstract

The application relates to the technical field of battery packs, in particular to an anti-loose electrical connection battery pack. The technical scheme comprises a shell, an internal battery pack and a liquid cooling channel. The innovation is that a hydraulic locking module is integrated into the connecting part of the copper bar leading out of the shell. The module fills transmission medium in the flow cavity of the limiting ring, and controls the in-out of the plug by using a driving mechanism, so as to block or release the rotating path of the blocking block linked with the nut. When the plug blocks the flow cavity, a hydraulic lock is formed, and the nut is completely prevented from loosening; when the plug exits, the nut can be normally screwed. The application fundamentally solves the problem that the electrical connection is prone to loosening in a vibrating environment, is high in safety and convenient in operation and maintenance.

Description

Technical Field

[0001] This invention relates to the field of battery pack technology, and more particularly to a battery pack with an anti-loosening electrical connection. Background Technology

[0002] Battery packs, especially high-power battery packs used in electric vehicles, special vehicles, and large energy storage systems, consist of multiple cells connected in series and parallel via copper busbars. These busbars then transmit high-voltage, high-current energy to an external load. During operation, battery packs are continuously subjected to intense mechanical vibration, impact, and thermal expansion and contraction stress from charge-discharge cycles. These factors can easily cause the traditional bolted connections of the lead terminals to loosen.

[0003] Currently, the main methods for preventing loosening of electrical connections are mechanical, such as using spring washers, toothed washers, self-locking nuts, or applying thread-locking agents. However, these existing technologies all have significant limitations: spring washers and toothed washers may fail due to fatigue or embed into the substrate under long-term vibration and stress, leading to a decrease in preload; the nylon portion of self-locking nuts is prone to aging at high temperatures, and their anti-loosening effect diminishes sharply after repeated disassembly and reassembly; while thread-locking agents require significant torque during disassembly and need to be reapplied afterward, making on-site maintenance inconvenient. These methods essentially still rely on friction or elastic deformation, and under extremely complex operating conditions, their reliability and durability in preventing loosening cannot be fundamentally guaranteed. Summary of the Invention

[0004] The purpose of this application is to address the problems existing in the background technology by proposing a novel electrical connection scheme that is more fundamental, more reliable, and easier to operate and maintain, in order to solve the problem of anti-loosening electrical connection battery packs in high-reliability application scenarios.

[0005] The technical solution of this application: A battery pack with anti-loosening electrical connection, comprising a housing, multiple batteries fixedly installed inside the housing, adjacent batteries being connected by connecting copper busbars, wherein two of the batteries are fixedly installed with lead-out copper busbars, the lead-out copper busbars extending through one side of the housing to the outside of the housing, and further comprising:

[0006] A connecting component is provided, wherein an external copper busbar is connected to the connecting component, and the connecting component fixes the lead-out copper busbar and the external copper busbar together. The connecting component includes a mounting base fixedly installed on the housing, a pressure plate connected to the mounting base, and a connecting pin fixedly installed on the pressure plate. A nut that is threadedly connected to the connecting pin is installed on the mounting base.

[0007] A locking module for controlling the connection state between a nut and a mounting base, the connection state including a fixed connection and a rotatable connection, the locking module including a limiting ring mounted on the mounting base, the limiting ring having a flow cavity, a sealing ring rotatably mounted on the limiting ring and fixedly connected to the nut, at least one sealing block fixedly mounted on the sealing ring, at least two plugs slidably mounted in the flow cavity to block the flow cavity, the flow cavity being filled with a transmission medium, and a drive mechanism mounted on the mounting base to control the entry and exit of multiple plugs in the flow cavity.

[0008] Optionally, the limiting ring is provided with an annular connecting groove communicating with the flow cavity, and the sealing ring is installed inside the connecting groove and seals the connecting groove.

[0009] Optionally, the limiting ring is provided with a plurality of connecting chambers corresponding one-to-one with the plugs, and the plugs are slidably installed inside the connecting chambers.

[0010] Optionally, the connecting pin is provided with threads for connection with the nut, and a connecting disc is fixedly installed on the nut, the connecting disc being fixedly connected to the sealing ring.

[0011] Optionally, a sliding sleeve is fixedly installed on the mounting base, and the driving mechanism includes a rotating ring slidably installed inside the sliding sleeve. The rotating ring is provided with a plurality of protrusions that correspond one-to-one with the plugs, and a telescopic rod with elasticity and slidably connected to the protrusions is installed on the plug.

[0012] Optionally, the protrusion includes a lifting part and a leveling part, and both the lifting part and the leveling part are provided with sliding grooves.

[0013] Optionally, the telescopic rod includes a slide rod fixedly installed on the plug and a slide cylinder slidably installed on the slide rod. A spring is fixedly installed between the slide cylinder and the slide rod. A rolling element is rotatably installed on the slide cylinder and is slidably installed inside the slide groove.

[0014] Optionally, a handle is fixedly installed on the rotating ring, the handle is provided with a connecting hole, and the mounting base is provided with two positioning holes. The connecting hole is fixedly connected to either of the positioning holes by a pin.

[0015] Optionally, a buffer assembly is installed on the limiting ring. The buffer assembly includes a buffer cylinder that is fixedly installed on the limiting ring and communicates with the flow cavity. A sealing plate is slidably and sealingly connected inside the buffer cylinder.

[0016] Optionally, the bottom of the housing is provided with a liquid cooling channel, and connectors are fixedly installed at both ends of the liquid cooling channel.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] This application provides an extremely reliable anti-vibration loosening protection that surpasses traditional friction self-locking. By hydraulically locking, it fundamentally eliminates the possibility of nut rotation, greatly improving the safety and reliability of the battery pack under harsh working conditions.

[0019] Furthermore, the locking structure is controllable, and the unlocking and locking operations are convenient. It can be reused without replacing parts, which facilitates the maintenance and disassembly of the battery pack and reduces the total life cycle cost. The design cleverly utilizes fluid transmission, resulting in a large and uniform locking force. It is not sensitive to changes in preload caused by vibration, thermal expansion and contraction, etc., and its performance is stable and durable. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the battery pack structure;

[0021] Figure 2 This is a schematic diagram of the liquid cooling channel structure;

[0022] Figure 3 This is a schematic diagram of the internal structure of the shell;

[0023] Figure 4 A schematic diagram of the structure connecting the copper busbar and the lead-out copper busbar;

[0024] Figure 5 Schematic diagram of the connecting components Figure 1 ;

[0025] Figure 6 Schematic diagram of the connecting components Figure 2 ;

[0026] Figure 7 Schematic diagram of the connecting components Figure 3 ;

[0027] Figure 8 Schematic diagram of the connecting components Figure 4 ;

[0028] Figure 9 for Figure 6 A magnified view of a section at point A in the middle;

[0029] Figure 10 for Figure 8 A magnified view of a section at point B in the middle;

[0030] Figure 11 Schematic diagram of the locking module Figure 1 ;

[0031] Figure 12 Schematic diagram of the locking module Figure 2 ;

[0032] Figure 13 Schematic diagram of the locking module Figure 3;

[0033] Figure 14 This is a structural diagram of the connecting pin.

[0034] Reference numerals: 1. Outer shell; 11. Liquid cooling channel; 12. Connector; 2. Battery; 21. Connecting copper busbar; 22. Lead-out copper busbar; 3. Connecting component; 31. Mounting base; 32. Pressure plate; 321. Connecting pin; 322. Thread; 33. Sliding sleeve; 34. Nut; 341. Connecting plate; 35. Locking module; 351. Limiting ring; 352. Flow chamber; 353. Connecting groove; 354. Sealing ring; 355. Sealing block; 356. Connecting chamber; 357. Plug; 358. Transmission medium; 36. Drive mechanism; 361. Rotary ring; 362. Protrusion; 3621. Lifting part; 3622. Leveling part; 3623. Slide groove; 363. Telescopic rod; 3631. Slide rod; 3632. Slide cylinder; 3633. Spring; 364. Rolling element; 365. Handle; 366. Connecting hole; 367. Positioning hole; 368. Pin; 37. Buffer assembly; 371. Buffer cylinder; 372. Sealing plate; 4. External copper busbar; 41. Through hole. Detailed Implementation

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] Example: Figures 1 to 4 As shown, this application proposes an anti-loosening electrical connection battery pack, including a housing 1 and multiple batteries 2 fixedly installed inside the housing 1. Adjacent batteries 2 are connected by connecting copper busbars 21. Two lead-out copper busbars 22 are fixedly installed on two batteries 2, extending through one side of the housing 1 to the outside of the housing 1. The connecting copper busbars 21 and lead-out copper busbars 22 are connected to the batteries 2 by welding. Welding can ensure the stability of the connection and has good anti-vibration and anti-loosening performance. The lead-out copper busbars 22 serve as the electrical interface for the battery pack to transmit energy to the outside. They are directly connected to the core battery unit inside the battery pack and are responsible for efficiently and reliably guiding the DC power stored in the battery pack to the outside of the housing 1.

[0037] The bottom of the outer casing 1 is provided with a liquid cooling channel 11, and connectors 12 are fixedly installed at both ends of the liquid cooling channel 11. The battery 2 will continuously generate heat during charging and discharging. If the heat accumulates, it will lead to performance degradation, shortened life and even safety risks. The liquid cooling channel 11 is integrated into the bottom of the outer casing 1. Coolant can flow inside it. It directly and efficiently absorbs the heat generated by the battery 2 through the principle of liquid cooling plate to achieve balanced heat dissipation. The connectors 12 serve as quick interfaces, which facilitate quick and sealed connection with external cooling pipes when the battery pack is integrated into the vehicle or system, forming a complete liquid cooling circulation system to ensure that the battery pack always works in the optimal temperature range.

[0038] like Figure 4 , Figure 5 and 14 As shown, the electrical connection battery pack of this embodiment also includes a connecting component 3. An external copper busbar 4 is connected to the connecting component 3. The connecting component 3 securely connects the lead-out copper busbar 22 and the external copper busbar 4. The connecting component 3 includes a mounting base 31 fixedly mounted on the outer casing 1, a pressure plate 32 connected to the mounting base 31, and a connecting pin 321 fixedly mounted on the pressure plate 32. The connecting pin 321 passes through a through hole 41 on the external copper busbar 4, thus limiting the movement of the external copper busbar 4. A nut 34 is installed on the mounting base 31 and threadedly connected to the connecting pin 321. The connecting pin 321 has a thread 322 that connects to the nut 34. A connecting disc 341 is fixedly mounted on the nut 34. When the battery pack needs to be put into use, the external copper busbar 4 is firmly pressed onto the end of the lead-out copper busbar 22 through the connecting component 3. Since both are made of highly conductive copper and the connection surface is tightly fixed, a low-resistance, high-current electrical node is formed. Thus, the electrical energy inside the battery pack can pass through the battery 2 – connecting copper busbar 21. - Lead-out copper busbar 22 - Connecting component 3 - External copper busbar 4 This path conducts to the outside, and the other end of the external copper busbar 4 is connected to the input terminal of the external electrical equipment, thereby completing the entire electrical connection and supplying power to the external equipment.

[0039] like Figure 5 and Figures 10 to 14As shown, the electrical connection battery pack also includes a locking module 35 that controls the connection state between the nut 34 and the mounting base 31. The connection state includes a fixed connection and a rotating connection. When the nut 34 is fixedly connected to the mounting base 31, the nut 34 cannot rotate. At this time, the connecting pin 321 cannot disengage from the nut 34 even under vibration, so that the connecting pin 321 cannot rotate under vibration, thereby ensuring the stability of the connection. The locking module 35 includes a limiting ring 351 installed on the mounting base 31. The limiting ring 351 has a flow cavity 352. A sealing ring 354 fixedly connected to the nut 34 is rotatably installed on the limiting ring 351. The limiting ring 351 has an annular connecting groove 353 communicating with the flow cavity 352. The sealing ring 354 is installed inside the connecting groove 353 and seals the connecting groove 353. When the nut 34 is rotated, the sealing ring 354 will rotate. Under the action of the sealing ring 354, the flow cavity 352 can always be kept in a sealed state.

[0040] Furthermore, at least one sealing block 355 is fixedly installed on the sealing ring 354. The sealing block 355 will rotate synchronously with the sealing ring 354 and the nut 34, and the sealing block 355 will block the flow cavity 352. At least two plugs 357 that block the flow cavity 352 are slidably installed inside the flow cavity 352. When rotating the nut 34, the plugs 357 need to be moved away from the flow cavity 352 to prevent movement interference with the sealing block 355. After the nut 34 is tightened, the plugs 357 need to be reset. At this time, the plugs 357 may overlap with the sealing block 355. The setting of multiple plugs 357 can ensure that at least one plug 357 can block the flow cavity 352. The limiting ring 351 is provided with multiple connecting chambers 356 that correspond one-to-one with the plugs 357. The connecting chambers 356 support the plugs 357 and can improve the contact area and sealing performance.

[0041] It is worth noting that the plug 357 is slidably installed inside the connecting chamber 356, and the flow cavity 352 is filled with a transmission medium 358, which is an incompressible fluid under working conditions. When the nut 34 is rotated to drive the sealing block 355 to rotate, the transmission medium 358 between the sealing block 355 and the plug 357 needs to be compressed. If the plug 357 blocks the flow cavity 352 at this time, and the transmission medium cannot be compressed, then the sealing block 355 will not be able to rotate, thereby causing the nut 34 to... The inability to rotate effectively prevents the nut 34 from loosening. When it is necessary to rotate the nut 34, simply move the plug 357 so that the plug 357 no longer blocks the flow cavity 352. At this time, the transmission medium 358 inside the flow cavity 352 will move freely and will not affect the rotation of the plugging block 355 and the nut 34. This allows the nut 34 to be locked at any position, and the locking state can be released while maintaining stability, effectively improving the convenience and stability of locking the nut 34.

[0042] like Figures 5 to 9 As shown, in this embodiment, a drive mechanism 36 is installed on the mounting base 31 to control the entry and exit of multiple plugs 357 into and out of the flow cavity 352. A sliding sleeve 33 is fixedly installed on the mounting base 31. The drive mechanism 36 includes a rotating ring 361 slidably installed inside the sliding sleeve 33. The rotating ring 361 is provided with multiple protrusions 362 corresponding one-to-one with the plugs 357. A telescopic rod 363 with elasticity and slidably connected to the protrusions 362 is installed on the plugs 357. When the rotating ring 361 is rotated, it will drive the multiple protrusions 362 to rotate. At this time, the arc-shaped setting of the protrusions 362 will drive the telescopic rod 363 to move. The moving telescopic rod 363 will drive the plugs 357 connected to it to move, thereby controlling whether the plugs 357 block the flow cavity 352. If the plugs 357 are blocked by the blocking block 355, the telescopic rod 363 will be compressed to ensure that the rotating ring 361 can rotate normally.

[0043] Furthermore, the protrusion 362 includes a lifting part 3621 and a leveling part 3622. Both the lifting part 3621 and the leveling part 3622 are provided with sliding grooves 3623. When the telescopic rod 363 is located on the lifting part 3621, the rotation of the rotating ring 361 will drive the telescopic rod 363 to move along its axis. When the telescopic rod 363 moves to the leveling part 3622, the telescopic rod 363 will not move if the rotating ring 361 is rotated further. By setting a longer leveling part 3622, the telescopic rod 363 can only move to the lifting part 3621 when the rotating ring 361 is rotated over a wide range. This can prevent the rotating ring 361 from rotating slightly under vibration and ensure the stability of the locking.

[0044] Furthermore, the telescopic rod 363 includes a slide rod 3631 fixedly installed on the plug 357 and a slide cylinder 3632 slidably installed on the slide rod 3631. A spring 3633 is fixedly installed between the slide cylinder 3632 and the slide rod 3631. A rolling element 364 is rotatably installed on the slide cylinder 3632. The rolling element 364 is slidably installed inside the slide groove 3623. When the telescopic rod 363 is compressed, it is necessary to overcome the elastic force of the spring 3633. Under the action of the elastic force of the spring 3633, the plug 357 can be pressed tighter inside the flow cavity 352, ensuring the sealing of the flow cavity 352.

[0045] The rotating ring 361 is fixedly equipped with a handle 365, which has a connecting hole 366. The mounting base 31 has two positioning holes 367. The connecting hole 366 is fixedly connected to either of the positioning holes 367 by a pin 368. By rotating the handle 365, the rotating ring 361 can be rotated, which can control whether the plug 357 blocks the flow cavity 352, and thus control whether the nut 34 can be rotated. Furthermore, the pin 368 prevents the rotating ring 361 from rotating too much, ensuring the stability of the plug 357.

[0046] like Figure 11 As shown, in this embodiment, a buffer assembly 37 is installed on the limiting ring 351. The buffer assembly 37 includes a buffer cylinder 371 fixedly installed on the limiting ring 351 and communicating with the flow cavity 352. A sealing plate 372 is slidably and sealingly connected inside the buffer cylinder 371. When the plug 357 enters or exits the flow cavity 352, a portion of the transmission medium 358 inside the flow cavity 352 needs to be replenished or discharged. At this time, this portion of the transmission medium 358 will enter or leave the buffer cylinder 371, ensuring that the flow cavity 352 is always filled with the transmission medium 358.

[0047] Working principle: When connecting the battery pack to an external device, align the external copper busbar 4 with the lead-out copper busbar 22 of the battery pack. Tightening the nut 34 will cause the nut 34 and the connecting pin 321 to move relative to each other, and the pressure plate 32 will press the two copper busbars tightly together. When rotating the nut 34, the nut 34 will rotate and move up and down. The rotation of the nut 34 will drive the sealing block 355 to rotate and move up and down, which can drive the rotating ring 361 to move on the sliding sleeve 33. However, since the plug 357 will not contact the sealing block 355 at this time, the rotation of the sealing block 355 will not drive the rotating ring 361 to rotate. The rotating ring 361 is only affected by the vertical movement, so there is no motion interference when rotating the nut 34, forming a low-resistance electrical path. When the nut 34 is tightened, the drive mechanism 36 rotates the rotating ring 361, pushing the telescopic rod 363 and its associated components. The connected plug 357 moves inward, inserts into the flow cavity 352, and seals it. At this time, the flow cavity 352 is filled with incompressible transmission medium 358. Since the sealing block 355, which rotates synchronously with the nut 34, is also located in the flow cavity 352, the sealing of the plug 357 prevents the transmission medium 358 from flowing, thus forming a hydraulic lock that firmly locks the sealing block 355 and the nut 34, preventing them from rotating and achieving absolute anti-loosening. When disassembly or adjustment is required, the drive mechanism 36 rotates the rotating ring 361 in the opposite direction, causing the plug 357 to exit from the flow cavity 352. At this time, the transmission medium 358 can flow freely in the flow cavity 352 and no longer obstructs the rotation of the sealing block 355. Therefore, the nut 34 can be rotated normally. The buffer assembly 37, through the movement of the sealing plate 372, compensates for the volume change of the transmission medium 358 caused by the entry and exit of the plug 357, ensuring that the system is always filled with medium. The sealing ring 354 ensures the dynamic seal between the rotating and stationary parts.

[0048] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A battery pack with anti-loosening electrical connection, comprising a housing, a plurality of batteries fixedly installed inside the housing, adjacent batteries being connected by connecting copper busbars, wherein two batteries are fixedly mounted with lead-out copper busbars, the lead-out copper busbars extending through one side of the housing to the outside of the housing, characterized in that, Also includes: The connecting component has an external copper busbar connected to it. The connecting component fixes the lead-out copper busbar and the external copper busbar together. The connecting component includes a mounting base fixedly installed on the housing, a pressure plate connected to the mounting base, and a connecting pin fixedly installed on the pressure plate. A nut that is threadedly connected to the connecting pin is installed on the mounting base. A locking module for controlling the connection state between a nut and a mounting base, the connection state including a fixed connection and a rotatable connection, the locking module including a limiting ring mounted on the mounting base, a flow cavity provided in the limiting ring, a sealing ring rotatably mounted on the limiting ring and fixedly connected to the nut, at least one sealing block fixedly mounted on the sealing ring, at least two plugs that block the flow cavity are slidably mounted in the flow cavity, the flow cavity is filled with a transmission medium, and a drive mechanism for controlling the entry and exit of multiple plugs in the flow cavity is mounted on the mounting base; The limiting ring is provided with an annular connecting groove that communicates with the flow cavity, and the sealing ring is installed inside the connecting groove and seals the connecting groove; The limiting ring is provided with multiple connecting chambers that correspond one-to-one with the plugs, and the plugs are slidably installed inside the connecting chambers.

2. The anti-loosening electrical connection battery pack according to claim 1, characterized in that, The connecting pin is provided with threads for connecting with the nut, and a connecting plate is fixedly installed on the nut, and the connecting plate is fixedly connected to the sealing ring.

3. The anti-loosening electrical connection battery pack according to claim 2, characterized in that, A sliding sleeve is fixedly installed on the mounting base. The driving mechanism includes a rotating ring that is slidably installed inside the sliding sleeve. The rotating ring has a plurality of protrusions that correspond one-to-one with the plugs. A telescopic rod with elasticity and slidably connected to the protrusions is installed on the plug.

4. The anti-loosening electrical connection battery pack according to claim 3, characterized in that, The protrusion includes a lifting part and a leveling part, and both the lifting part and the leveling part are provided with sliding grooves.

5. The anti-loosening electrical connection battery pack according to claim 4, characterized in that, The telescopic rod includes a slide rod fixedly installed on the plug and a slide cylinder slidably installed on the slide rod. A spring is fixedly installed between the slide cylinder and the slide rod. A rolling element is rotatably installed on the slide cylinder and is slidably installed inside the slide groove.

6. The anti-loosening electrical connection battery pack according to claim 5, characterized in that, A handle is fixedly installed on the rotating ring, and the handle is provided with a connecting hole. The mounting base is provided with two positioning holes, and the connecting hole is fixedly connected to either of the positioning holes by a pin.

7. A battery pack with anti-loosening electrical connection according to claim 6, characterized in that, A buffer assembly is installed on the limiting ring. The buffer assembly includes a buffer cylinder that is fixedly installed on the limiting ring and communicates with the flow cavity. A sealing plate is slidably and sealed inside the buffer cylinder.

8. The anti-loosening electrical connection battery pack according to claim 7, characterized in that, The bottom of the outer casing is provided with a liquid cooling channel, and connectors are fixedly installed at both ends of the liquid cooling channel.

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