An electric vehicle battery pack water cooling structure

Abstract

The application relates to the technical field of new energy automobile battery packs, and discloses an electric automobile battery pack water cooling structure, which comprises a shell, two battery packs are arranged in the shell, a supporting frame is fixedly connected to the lower side of the inner wall of the shell, a water cooling plate is arranged at the top of the supporting frame, the top of the water cooling plate is in close contact with the bottom of the battery pack, a plurality of placing grooves are formed in the inner wall of the shell, clamping grooves are formed in the left and right sides of the inner wall of the placing grooves, and clamping blocks are clamped in the clamping grooves. The shell is modularized, the battery pack is limited by the limiting frame, the heat dissipation grooves in the limiting frame can concentrate heat dissipation on the position with high temperature of the battery pack, the overall temperature of the battery pack is balanced, the service life of the battery pack is good, the water cooling plate can be conveniently replaced, the labor cost is reduced, and the use economy is good.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle battery pack technology, specifically to a water-cooled structure for an electric vehicle battery pack. Background Technology

[0002] New energy vehicles refer to automobiles that use unconventional vehicle fuels as their power source, integrating advanced technologies in vehicle power control and drive to form vehicles with advanced technical principles, new technologies, and new structures. New energy vehicle battery packs are widely used in new energy hybrid vehicles. However, due to the high charge / discharge rates of hybrid vehicle battery packs, battery overheating becomes a serious problem, and normal natural cooling is insufficient. Therefore, a water-cooling structure is installed inside the battery pack's mounting housing for heat dissipation. Research shows that existing battery pack water-cooling structures generally consist of a cooling plate assembly, including a cooling water pump, antifreeze, refrigerant, compressor oil, and a control unit. These components work together to achieve the circulation of the cooling medium. When the battery pack temperature exceeds a preset value, the system activates, adjusting the refrigerant flow through an electronic expansion valve, and combining this with compressor speed control to precisely cool the battery to a predetermined stable temperature before stopping. However, in actual use, the water-cooling plate is usually directly attached to the outside of the bottom shell of the battery module or installed on both sides of the battery module. This causes the area of ​​the battery pack away from the water-cooling plate to have a relatively high temperature due to delayed heat dissipation. This results in a temperature gradient inside the battery module, increasing the internal resistance of the cells in the high-temperature area and reducing the usable capacity, thus shortening the cycle life. In the low-temperature area, the activity is insufficient, resulting in a decrease in the actual capacity utilization rate of the entire pack. Summary of the Invention

[0003] The purpose of this invention is to provide a water-cooled structure for an electric vehicle battery pack to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a water-cooled structure for an electric vehicle battery pack, comprising a housing, wherein at least two battery packs are installed inside the housing, a support frame is fixedly connected to the lower side of the inner wall of the housing, a water-cooling plate is installed at the top of the support frame, the top of the water-cooling plate is in contact with the bottom of the battery pack, a plurality of placement slots are provided on the inner wall of the housing, and slots are provided on the left and right sides of the inner wall of each placement slot, a locking block is engaged inside the slot, a limiting frame is slidably connected to the outside of the locking block, a connecting block is slidably connected to the outside of the limiting frame, the connecting block is fixedly connected to the water-cooling plate, a heat dissipation groove is provided inside the limiting frame, the heat dissipation groove is a slanted groove structure, a connecting pipe is detachably connected inside the heat dissipation groove, and the connecting pipe is connected to the water-cooling plate.

[0005] Preferably, the connecting block has a connecting groove inside, a sealing groove is formed on the upper side of the inner wall of the connecting groove, and an installation groove is formed on the lower side of the inner wall of the connecting groove. An elastic element is fixedly connected to the inner wall of the installation groove, a blocking block is fixedly connected to the top of the elastic element, a sealing block is fixedly connected to the top of the blocking block, and the top of the blocking block is in contact with the bottom end of the connecting pipe.

[0006] Preferably, the lower inner wall of the limiting frame is provided with multiple limiting grooves, the end of the card block away from the card groove is fixedly connected to a pressing block, the end of the pressing block away from the card block is fixedly connected to a pull rope, the pull rope is sleeved with an elastic element II, and the top end of the pull rope is fixedly connected to a pull block.

[0007] Preferably, the card block slides inside the connecting block, and the connecting block is slidably connected inside the placement slot.

[0008] Preferably, both sides of the heat dissipation groove have a "W" shaped groove structure, the end of the connecting pipe has a pipe opening, and the inner wall of the heat dissipation groove has multiple air inlets.

[0009] Preferably, the connecting groove is connected to the pipe opening, the connecting pipe is slidably connected inside the connecting groove, the blocking block is slidably connected inside the connecting groove, and the sealing block is in contact with the inner wall of the sealing groove.

[0010] Preferably, the card block is slidably connected inside the limiting groove, and the squeezing block is slidably connected inside the limiting groove.

[0011] Preferably, two grooves are formed inside the upper side of the limiting frame, one side of the pull rope is slidably connected to the inside of the limiting groove, and the other side of the pull rope is slidably connected to the inside of the groove.

[0012] Preferably, one end of the second elastic element is fixedly connected to the inner wall of the limiting groove, and the other end of the second elastic element is fixedly connected to the extrusion block.

[0013] Preferably, the pull block is slidably connected inside the slide groove, and two latching slots are provided at the top of the pull block.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] 1. In this invention, the limiting frame is selectively installed inside the heat dissipation slot as needed, improving ease of use and flexibility. The limiting frame is used to limit the battery pack to ensure installation stability. Heat dissipation slots without the limiting frame can dissipate heat from the sides of the battery pack. 2. In this invention, a blocking block is used to allow the coolant inside the battery pack's built-in water-cooling components to flow into the connecting pipes inside the heat dissipation slot, thereby achieving simultaneous water cooling and air cooling, improving the heat dissipation effect.

[0016] 3. In this invention, the heat dissipation groove has a special shape, which makes the airflow slower in the wider part of the heat dissipation groove and faster in the narrower part. Therefore, the appropriate heat dissipation groove can be selected according to the part of the battery pack with higher temperature, so that heat dissipation can be targeted and the heat dissipation effect is better.

[0017] 4. In this invention, a connecting pipe is detachably connected inside the heat dissipation groove. The air circulating in the heat dissipation groove can blow cooler air outside the connecting pipe, ensuring the water cooling efficiency of the connecting pipe and improving the air cooling quality. 5. In this invention, the modular design of the shell and the use of a limiting frame to limit the battery pack allow the heat dissipation groove inside the limiting frame to concentrate heat dissipation on the hottest areas of the battery pack, resulting in a more balanced overall temperature of the battery pack, a longer battery pack lifespan, and convenient replacement of the water-cooled plate, reducing labor costs and thus improving economic efficiency. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 For the present invention Figure 2 Cross-sectional view of the structure at point AA;

[0021] Figure 4 For the present invention Figure 3 Enlarged view of the structure at point A in the middle;

[0022] Figure 5 For the present invention Figure 3 Enlarged view of the structure at point B in the middle;

[0023] Figure 6 For the present invention Figure 2 Cross-sectional view of the structure at point BB;

[0024] Figure 7 This is a schematic diagram of the limiting frame structure of the present invention;

[0025] Figure 8 For the present invention Figure 7 Cross-sectional view of the structure at point CC;

[0026] Figure 9 For the present invention Figure 8 Enlarged view of the structure at point C;

[0027] Figure 10 For the present invention Figure 7 Cross-sectional view of the structure at point DD;

[0028] Figure 11 For the present invention Figure 10 Enlarged view of the structure at point D.

[0029] In the diagram: 1. Housing; 2. Battery pack; 3. Placement slot; 4. Slot; 5. Block; 6. Limiting frame; 7. Connecting block; 8. Heat dissipation slot; 9. Connecting pipe; 10. Pipe opening; 11. Connecting slot; 12. Support frame; 13. Water-cooled plate; 14. Slide groove; 15. Mounting slot; 16. Elastic element one; 17. Blocking block; 18. Sealing block; 19. Sealing slot; 20. Limiting slot; 21. Extrusion block; 22. Pull rope; 23. Elastic element two; 24. Pull block; 25. Clip slot; 26. Air inlet. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: Please refer to Figures 1 to 11This invention provides a technical solution: a water-cooled structure for an electric vehicle battery pack, including a housing 1. Two battery packs 2 are installed inside the housing 1, providing installation space for the battery packs 2. A support frame 12 is fixedly connected to the lower inner wall of the housing 1. A water-cooling plate 13 is installed at the top of the support frame 12. The support frame 12 has a mesh design, thus ensuring ventilation on the lower side while supporting the water-cooling plate 13. The top of the water-cooling plate 13 is in contact with the bottom of the battery pack 2, and the water-cooling plate 13 is used to cool the support frame 12. However, the inner wall of the housing 1 has multiple placement slots 3, and the left and right sides of the inner wall of the placement slot 3 have slots 4. A locking block 5 is engaged inside the slot 4, and a limiting frame 6 is slidably connected to the outside of the locking block 5. The limiting frame 6 is slidably connected inside the placement slot 3, allowing the placement slot 3 to limit the limiting frame 6. When the limiting frame 6 is not installed inside the placement slot 3, the placement slot 3 can act as a heat dissipation recess to cool the battery pack 2. A connecting block 7 is slidably connected to the outside of the limiting frame 6, and the locking block 5 slides against the inside of the connecting block 7. The connecting block 7 is slidably connected inside the placement slot 3, allowing it to be confined within the slot 3 and abutting against the limiting frame 6. The connecting block 7 is fixedly connected to the water-cooling plate 13, thus confining the water-cooling plate 13. The limiting frame 6 has a heat dissipation slot 8 inside, which is a slanted slot structure with "W"-shaped slots on both sides. This results in a slower airflow at wider sections and a faster airflow at narrower sections of the heat dissipation slot 8. This allows for the selection of the appropriate heat dissipation slot 8 based on the location of higher temperature in the battery pack 2. The heat dissipation can be targeted, resulting in better heat dissipation effect. The heat dissipation tank 8 is detachably connected to a connecting pipe 9. The connecting pipe 9 is used to water cool the battery pack 2 and cool the air inside the heat dissipation tank 8, resulting in better air cooling effect. The end of the connecting pipe 9 is provided with a pipe port 10. The inner wall of the heat dissipation tank 8 is provided with multiple air inlets 26. The air inlets 26 allow air to flow into the heat dissipation tank 8. The connecting pipe 9 is connected to the water cooling plate 13, allowing the coolant inside the water cooling plate 13 to flow inside the connecting pipe 9.

[0032] When heat dissipation is required for battery pack 2, the limiting frame 6 is slid into the placement groove 3, allowing it to slide against the connecting block 7, thus limiting the connection block 7. Then, the two locking blocks 5 are moved outwards, allowing them to penetrate the connection block 7 and engage with the groove 4. This ensures the limiting frame 6 and the connection block 7 are stably positioned within the placement groove 3, allowing the water-cooling plate 13 to be stably installed inside the housing 1. The connecting pipe 9 then slides into the connecting block 7, connecting the pipe to the water-cooling plate 13. This allows the coolant inside the water-cooling plate 13 to enter the connecting pipe 9, enabling water cooling of the upper part of battery pack 2. Combined with the heat dissipation groove 8, this improves cooling efficiency at higher temperatures, resulting in a more balanced overall temperature for battery pack 2 and a longer lifespan. Conversely, the water-cooling plate 13 can be easily replaced, reducing labor costs and improving economic efficiency.

[0033] Example 2: Based on Example 1, in order to achieve automatic blocking of the connecting groove 11 by the blocking block 17, a connecting groove 11 is provided inside the connecting block 7. The connecting groove 11 is connected to the pipe opening 10. The connecting pipe 9 is slidably connected inside the connecting groove 11. The connecting groove 11 limits the movement of the connecting pipe 9, allowing it to slide smoothly. A sealing groove 19 is provided on the upper side of the inner wall of the connecting groove 11, and an installation groove 15 is provided on the lower side of the inner wall of the connecting groove 11. An elastic element 16 is fixedly connected to the inner wall of the installation groove 15, providing installation space for the elastic element 16. A blocking block 17 is fixedly connected to the top of the elastic element 16. The blocking block 17 is slidably connected inside the connecting groove 11. The connecting groove 11 limits the blocking block 17, allowing the blocking block 17 to slide smoothly. A sealing block 18 is fixedly connected to the top of the blocking block 17. The sealing block 18 fits against the inner wall of the sealing groove 19, thereby blocking the connecting groove 11 and preventing the coolant inside the water-cooled plate 13 from entering the connecting groove 11. The top of the blocking block 17 fits against the bottom of the connecting pipe 9, allowing the connecting pipe 9 to push the blocking block 17 downward.

[0034] When the limiting frame 6 slides against the connecting block 7, the connecting pipe 9 slides into the interior of the connecting groove 11, causing the connecting pipe 9 to push the blocking block 17 downwards. This causes the blocking block 17 to pull the sealing block 18 out of the interior of the sealing groove 19, and the blocking block 17 to squeeze the elastic element 16 to deform. Consequently, the blocking block 17 no longer blocks the entrance of the connecting groove 11, allowing the pipe opening 10 to connect with the connecting groove 11. This allows the coolant inside the water-cooled plate 13 to enter the interior of the connecting pipe 9 through the pipe opening 10. Conversely, when the connecting pipe 9 detaches from the interior of the connecting groove 11, the elastic element 16 performs a reset movement, causing the elastic element 16 to push the blocking block 17 upwards. This causes the blocking block 17 to push the sealing block 18 into contact with the interior of the sealing groove 19, preventing the connecting groove 11 from connecting to the outside. Consequently, the blocking block 17 blocks the connecting groove 11, preventing the coolant inside the water-cooled plate 13 from flowing into the interior of the connecting groove 11.

[0035] Example 3: Based on Example 2, to facilitate the pulling of the locking block 5, multiple limiting grooves 20 are provided on the lower side of the inner wall of the limiting frame 6. The locking block 5 is slidably connected inside the limiting grooves 20, which provide movement space for the locking block 5. A pressing block 21 is fixedly connected to the end of the locking block 5 away from the locking groove 4. The pressing block 21 is used to pull the locking block 5 to move. The pressing block 21 is slidably connected inside the limiting grooves 20, which limit the pressing block 21, allowing it to slide smoothly. A pull rope 22 is fixedly connected to the end of the pressing block 21 away from the locking block 5. The pull rope 22 is used to pull the pressing block 21 to move. Two sliding grooves 14 are provided inside the upper side of the limiting frame 6. One side of the pull rope 22 is slidably connected inside the limiting grooves 20. The other side is slidably connected to the inside of the slide groove 14. The limiting groove 20 and the slide groove 14 limit the pull rope 22, allowing the pull rope 22 to slide smoothly. An elastic element 23 is sleeved on the outside of the pull rope 22. One end of the elastic element 23 is fixedly connected to the inner wall of the limiting groove 20, and the other end of the elastic element 23 is fixedly connected to the pressing block 21. A pull block 24 is fixedly connected to the top of the pull rope 22. The pull block 24 is used to pull the pull rope 22 to move. The pull block 24 is slidably connected to the inside of the slide groove 14. The slide groove 14 limits the pull block 24, allowing the pull block 24 to slide smoothly. The pull block 24 can pull the limiting frame 6 upward through the slide groove 14. Two snap-fit ​​grooves 25 are opened at the top of the pull block 24. The snap-fit ​​grooves 25 are used to conveniently pull the pull block 24 to move.

[0036] When the locking block 5 needs to be pulled, the pulling block 24 is pulled upward by the latching groove 25, so that the locking groove 4 drives one end of the pulling rope 22 to move upward, so that the other end of the pulling rope 22 pulls the pressing block 21 to move inward, so that the pressing block 21 compresses the elastic element 23 to deform, so that the pressing block 21 drives the locking block 5 to slide into the interior of the limiting groove 20. When the pulling block 24 is in contact with the inner wall of the sliding groove 14, the pulling block 24 is pulled upward, so that the pulling block 24 pulls the limiting frame 6 to disengage from the interior of the placement groove 3. Conversely, by releasing the pulling block 24, the elastic element 23 can perform a reset movement, so that the elastic element 23 can push the pressing block 21 to move outward, so that the pressing block 21 can push the locking block 5 through the connecting block 7 and engage with the interior of the locking groove 4.

[0037] Example 4: Based on Example 3, a method for using a water-cooled structure for an electric vehicle battery pack is proposed, including the following steps:

[0038] Step 1: When the limiting frame 6 needs to be installed, the support frame 12 and the water-cooling plate 13 are slid into the interior of the housing 1 in sequence, and then the top of the battery pack 2 is attached to the water-cooling plate 13 so that the water-cooling plate 13 can cool the battery pack 2. Then, the pull block 24 is pulled upward by the snap-on groove 25, so that the slot 4 can drive one end of the pull rope 22 to move upward, so that the other end of the pull rope 22 can pull the pressing block 21 to move inward, so that the pressing block 21 can compress the elastic element 23 to deform, so that the pressing block 21 can drive the locking block 5 to slide into the interior of the limiting groove 20. When the pull block 24 is attached to the inner wall of the slide groove 14, the pull block 24 is pulled upward, so that the pull block 24 can pull the limiting frame 6 out of the interior of the placement groove 3 and slide the limiting frame 6 into the interior of the placement groove 3.

[0039] Step 2: After the bottom end of the limiting frame 6 is attached to the connecting block 7, the elastic element 23 is reset by releasing the pull block 24, which in turn pushes the squeezing block 21 to move outward, so that the squeezing block 21 pushes the locking block 5 through the inside of the connecting block 7 and the slot 4 to engage, so that the water cooling plate 13 and the limiting frame 6 can be stably installed inside the housing 1.

[0040] Step 3: At this time, the connecting pipe 9 can slide into the interior of the connecting groove 11, so that the connecting pipe 9 can push the blocking block 17 to move downward, so that the blocking block 17 can drive the sealing block 18 to disengage from the interior of the sealing groove 19, and so that the blocking block 17 can squeeze the elastic element 16 to deform, so that the blocking block 17 no longer blocks the entrance of the connecting groove 11, so that the pipe opening 10 can be connected to the connecting groove 11, so that the coolant inside the water cooling plate 13 can enter the interior of the connecting pipe 9 through the pipe opening 10, thereby cooling the upper side of the battery pack 2, and the external air can enter the interior of the heat dissipation groove 8 through the air inlet 26, thereby increasing the air flow rate in the narrow part of the heat dissipation groove 8, thereby rapidly cooling the higher temperature part of the battery pack 2, making the overall temperature of the battery pack 2 more uniform, resulting in better cooling effect and better service life of the battery pack 2;

[0041] Step 4: By pulling the pull block 24 upward, the locking block 5 is disengaged from the slot 4 and the inside of the connecting block 7 and slides into the inside of the limiting groove 20. This removes the restriction on the limiting frame 6 and allows it to slide upward, thereby driving the connecting pipe 9 to move upward. When the connecting pipe 9 disengages from the inside of the connecting groove 11, the elastic element 16 performs a reset movement, which pushes the blocking block 17 upward. This allows the blocking block 17 to push the sealing block 18 to fit against the inside of the sealing groove 19, preventing the connecting groove 11 from communicating with the outside. This also allows the blocking block 17 to block the connecting groove 11, preventing the coolant inside the water-cooled plate 13 from flowing into the connecting groove 11. This results in a high level of sealing and facilitates the replacement of the limiting frame 6 and the water-cooled plate 13.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-cooled structure for an electric vehicle battery pack, comprising a housing (1), wherein at least two battery packs (2) are installed inside the housing (1), characterized in that: A support frame (12) is fixedly connected to the lower side of the inner wall of the housing (1). A water-cooled plate (13) is installed on the top of the support frame (12). The top of the water-cooled plate (13) is attached to the bottom of the battery pack (2). A plurality of placement slots (3) are opened on the inner wall of the housing (1). A slot (4) is opened on both the left and right sides of the inner wall of the placement slot (3). A card block (5) is inserted inside the slot (4). A limit frame (6) is slidably connected to the outside of the card block (5). A connecting block (7) is slidably connected to the outside of the limit frame (6). The connecting block (7) is fixedly connected to the water-cooled plate (13). A heat dissipation groove (8) is opened inside the limit frame (6). The heat dissipation groove (8) is a slanted groove structure. A connecting pipe (9) is detachably connected inside the heat dissipation groove (8). The connecting pipe (9) is connected to the water-cooled plate (13). The lower inner wall of the limiting frame (6) is provided with multiple limiting grooves (20). The end of the card block (5) away from the card groove (4) is fixedly connected to a pressing block (21). The end of the pressing block (21) away from the card block (5) is fixedly connected to a pull rope (22). An elastic element (23) is sleeved on the outside of the pull rope (22). The top end of the pull rope (22) is fixedly connected to a pull block (24). The connecting block (7) has a connecting groove (11) inside. The upper side of the inner wall of the connecting groove (11) has a sealing groove (19). The lower side of the inner wall of the connecting groove (11) has an installation groove (15). An elastic element (16) is fixedly connected to the inner wall of the installation groove (15). A blocking block (17) is fixedly connected to the top of the elastic element (16). A sealing block (18) is fixedly connected to the top of the blocking block (17). The top of the blocking block (17) is in contact with the bottom of the connecting pipe (9). The connecting groove (11) is connected to the pipe opening (10), the connecting pipe (9) is slidably connected inside the connecting groove (11), the blocking block (17) is slidably connected inside the connecting groove (11), and the sealing block (18) is in contact with the inner wall of the sealing groove (19).

2. The water-cooled structure for an electric vehicle battery pack according to claim 1, characterized in that: The card block (5) slides inside the connecting block (7), and the connecting block (7) is slidably connected inside the placement slot (3).

3. The water-cooled structure for an electric vehicle battery pack according to claim 1, characterized in that: The heat dissipation groove (8) has a "W" shaped groove structure on both sides, the end of the connecting pipe (9) is provided with a pipe opening (10), and the inner wall of the heat dissipation groove (8) is provided with multiple air inlets (26).

4. The water-cooled structure for an electric vehicle battery pack according to claim 1, characterized in that: The card block (5) is slidably connected inside the limiting groove (20), and the squeezing block (21) is slidably connected inside the limiting groove (20).

5. The water-cooled structure for an electric vehicle battery pack according to claim 1, characterized in that: The upper side of the limiting frame (6) has two sliding grooves (14). One side of the pull rope (22) is slidably connected to the inside of the limiting groove (20), and the other side of the pull rope (22) is slidably connected to the inside of the sliding groove (14).

6. The water-cooled structure for an electric vehicle battery pack according to claim 1, characterized in that: One end of the second elastic element (23) is fixedly connected to the inner wall of the limiting groove (20), and the other end of the second elastic element (23) is fixedly connected to the extrusion block (21).

7. The water-cooled structure for an electric vehicle battery pack according to claim 5, characterized in that: The pull block (24) is slidably connected inside the slide groove (14), and two snap-fit ​​grooves (25) are opened at the top of the pull block (24).

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