Liquid cooling assembly, battery case, and battery pack

Abstract

The present application provides a liquid cooling assembly, a battery case, and a battery pack. An energy storage case comprises: a bottom plate; a plurality of first side plates surrounding the periphery of the bottom plate, the plurality of first side plates and the bottom plate jointly defining an accommodating cavity, and the accommodating cavity being used for accommodating an electrical element; a bearing member arranged in the accommodating cavity, one side of the bearing member being fixedly connected to the bottom plate and the other side of the bearing member being used for mounting the electrical element; and a plurality of connecting members arranged on the bottom plate, the bearing member being connected to the bottom plate by means of the connecting members.

Description

Liquid cooling assembly, battery box and battery pack

[0001] The present application claims priority to the Chinese patent application No. 202421954055.1 filed on August 12, 2024 with the China Patent Office, the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery pack, in particular to a liquid cooling assembly, a battery box and a battery pack. BACKGROUND

[0003] The rapid development of the new energy industry puts higher requirements on the thermal management technology of the battery system, and the structural design of the liquid cooling plate is particularly important. SUMMARY

[0004] The liquid cooling plate is generally fixed in the lower box or tray of the battery pack and needs to bear part of the weight of the module. In the related technology, there is a technical solution that the upper cover and the bottom plate of the battery box are both set as liquid cooling plates, which can improve the cooling and heat dissipation effect of the battery. However, due to the low strength of the liquid cooling plate itself, the liquid cooling plate is exposed outside and is easily damaged by external collisions, which reduces the service life of the liquid cooling plate and also affects the heat dissipation effect of the battery module.

[0005] Therefore, it is urgent to design a liquid cooling assembly, a battery box and a battery pack to solve the technical hidden danger.

[0006] In a first aspect, the present application provides a liquid cooling assembly, comprising: a first liquid cooling plate, a second liquid cooling plate arranged below the first liquid cooling plate and connected with the first liquid cooling plate, an end face of the second liquid cooling plate facing the first liquid cooling plate being provided with a flow channel groove, a bottom of the flow channel groove being protruded from the second liquid cooling plate in a direction away from the first liquid cooling plate; and a reinforcing plate arranged below the second liquid cooling plate and connected with the second liquid cooling plate, an end face of the reinforcing plate facing the second liquid cooling plate being provided with a containing groove corresponding to the bottom of the flow channel groove, the containing groove being used for containing the part of the flow channel groove protruded from the second liquid cooling plate.

[0007] In a second aspect, the present application provides a battery box, comprising the above-mentioned liquid cooling assembly; a frame at least partially surrounding the first liquid cooling plate of the liquid cooling assembly, a containing cavity being formed between the frame and the first liquid cooling plate, the containing cavity being used for containing a battery module.

[0008] In a third aspect, the present application provides a battery pack, comprising the above-mentioned battery box; and a battery module arranged in the battery box. ADVANTAGEOUS EFFECTS

[0009] The liquid cooling assembly provided in the application is provided with a flow channel groove on the second liquid cooling plate, and the flow channel groove protrudes the second liquid cooling plate in a direction away from the first liquid cooling plate. Thus, when the battery module is deformed to generate an expansion force, the flow channel groove can be prevented from being extruded by the excessive expansion force to deform, thereby protecting the flow channel groove. Meanwhile, a reinforcing plate is arranged below the second liquid cooling plate, and the end face of the reinforcing plate towards the second liquid cooling plate is provided with a receiving groove corresponding to the flow channel groove. Thus, the protruding flow channel groove can be protected to prevent damage to the structure of the flow channel groove due to vibration and impact, thereby improving the service life of the liquid cooling assembly and ensuring the heat dissipation effect of the battery module.

[0010] The battery box provided in the application uses the liquid cooling assembly described above, thereby improving the heat dissipation effect of the battery box.

[0011] The battery pack provided in the application uses the liquid cooling assembly described above, thereby improving the heat dissipation effect of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0012] The following drawings of the embodiments of the application are hereby incorporated into this application as part of the application for the purpose of understanding the application. The embodiments of the application and the description thereof shown in the drawings are used to explain the principles of the application. In the drawings,

[0013] Fig. 1 is a perspective view of the liquid cooling assembly provided in the embodiment;

[0014] Fig. 2 is an exploded view of the liquid cooling assembly provided in the embodiment;

[0015] Fig. 3 is a structural view of the second liquid cooling plate from another perspective provided in the embodiment;

[0016] Fig. 4 is a perspective view of the battery box provided in the embodiment;

[0017] Fig. 5 is a perspective view of the first or third frame provided in the embodiment;

[0018] Fig. 6 is a perspective view of the battery pack provided in the embodiment.

[0019] Among them, the above drawings include the following reference signs:

[0020] 10, first liquid cooling plate;

[0021] 20, second liquid cooling plate; 21, flow channel groove;

[0022] 30, reinforcing plate; 31, receiving groove;

[0023] 41, first connecting hole; 42, second connecting hole;

[0024] 51, liquid inlet connector; 52, liquid outlet connector;

[0025] 60, frame; 61, accommodating cavity; 62, first side frame; 63, second side frame; 64, third side frame;

[0026] 70, accommodating structure;

[0027] 80, buffer;

[0028] 90, avoiding groove;

[0029] 100, battery module;

[0030] X, first direction; Y, second direction. Embodiments of the present application

[0031] As shown in FIGS. 1-3, in a first aspect, embodiments of the present application provide a liquid cooling assembly, which comprises: a first liquid cooling plate 10, a second liquid cooling plate 20 arranged below the first liquid cooling plate 10 and connected with the first liquid cooling plate 10, an end surface of the second liquid cooling plate 20 facing the first liquid cooling plate 10 is provided with a flow channel groove 21, a bottom of the flow channel groove 21 is arranged to protrude the second liquid cooling plate 20 in a direction away from the first liquid cooling plate 10; a reinforcing plate 30 arranged below the second liquid cooling plate 20 and connected with the second liquid cooling plate 20, an end surface of the reinforcing plate 30 facing the second liquid cooling plate 20 is provided with a receiving groove 31 corresponding to the bottom of the flow channel groove 21, the receiving groove 31 is used to accommodate the part of the flow channel groove 21 protruding the second liquid cooling plate 20.

[0032] By applying the technical solution of the present application, the flow channel groove 21 is arranged on the second liquid cooling plate 20, and the flow channel groove 21 is arranged to protrude the second liquid cooling plate 20 in a direction away from the first liquid cooling plate 10, so that when the battery module 100 deforms to generate an expansion force, the flow channel groove 21 can be prevented from being extruded by the excessive expansion force to deform, thereby protecting the flow channel groove 21, and the reinforcing plate 30 is arranged below the second liquid cooling plate 20, and the end surface of the reinforcing plate 30 facing the second liquid cooling plate 20 is provided with the receiving groove 31 corresponding to the flow channel groove 21, so that the protruding flow channel groove 21 can be protected, and damage to the structure of the flow channel groove 21 caused by vibration and impact can be prevented, thereby improving the service life of the liquid cooling assembly to ensure the heat dissipation effect of the battery module 100.

[0033] In the present application, X is the first direction, and Y is the second direction.

[0034] In the present application, the first liquid cooling plate 10 and / or the second liquid cooling plate 20 are formed by a plurality of metal structures by tailor welding. In this way, the use demand of the large-size liquid cooling plate in the present application can be met. At the same time, the tailor welding can realize the material optimization of a single component, reduce the design waste, and improve the overall structural strength, thereby being beneficial to prolong the service life of the first liquid cooling plate 10 and the second liquid cooling plate 20. In the present application, the first liquid cooling plate 10 and the second liquid cooling plate 20 are both formed by a plurality of metal structures by tailor welding, and after the tailor welding, the flow channel groove 21 is processed on the second liquid cooling plate 20.

[0035] In an embodiment, the cross-sectional shape of the metal structure includes a trapezoidal shape. In the present application, the contact surface of the two adjacent metal structures is a bevel, which can increase the contact area of the two metal structures, thereby facilitating the welding of the two metal structures, and also improving the structural strength after welding.

[0036] Specifically, the cross section of the flow channel groove 21 along the first direction is a continuous U-shaped structure, and the first direction is parallel to the length direction of the second liquid cooling plate 20. In this way, the contact area of the liquid cooling plate and the battery module 100 can be as large as possible, thereby improving the cooling effect of the liquid cooling assembly on the battery module 100.

[0037] Optionally, in other embodiments of the present application, the flow channel groove 21 can also be provided in a square structure or a ring structure, etc., as long as the heat dissipation demand of the liquid cooling assembly can be met.

[0038] In an embodiment, the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30 are all provided with first connecting holes 41, the first connecting holes 41 on the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30 are correspondingly arranged, and the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30 are connected and fixed by a connecting piece passing through the first connecting holes 41. In this way, the connection strength between the above-mentioned structures can be ensured. In the present application, the first connecting hole 41 is a bolt hole, which not only facilitates the disassembly and installation between structures, but also has a low cost of bolt fixation, thereby reducing the production cost of the device and being beneficial to realize the mass production of the device.

[0039] In the present application, the axis of the first connecting hole 41 is parallel to the second direction, which is not only beneficial to processing, but also facilitates the assembly between the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30, thereby improving the installation efficiency between the first liquid cooling plate 10, the second liquid cooling plate 20, and the reinforcing plate 30.

[0040] Further, the first connecting hole 41 is arranged at the middle part of the first liquid cooling plate 10. In this way, the structure of the first liquid cooling plate 10 is reasonably utilized, and no additional installation space is occupied, thereby being beneficial to realize the miniaturization development of the device.

[0041] Specifically, the first connecting holes 41 are arranged in multiple numbers and arrayed. By arranging the above structure, the connection of the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 can be ensured to be firm, thereby ensuring the stability of the liquid cooling assembly during operation.

[0042] In an embodiment, the liquid cooling assembly further comprises an inlet joint 51 and an outlet joint 52, and the inlet joint 51 and the outlet joint 52 are respectively connected to the flow channel groove 21. By arranging the above structure, the cooling liquid can be circulated in the flow channel groove 21 to cool the battery module 100 in time, thereby ensuring the normal operation of the battery module 100.

[0043] As shown in FIGS. 4 and 5, in a second aspect, the embodiments of the present application provide a battery box, which comprises the above-mentioned liquid cooling assembly; a frame 60, which is at least partially arranged on the first liquid cooling plate 10 of the liquid cooling assembly, and a containing cavity 61 is formed between the frame 60 and the first liquid cooling plate 10, and the containing cavity 61 is used for containing the battery module 100.

[0044] In an embodiment, the frame 60, the first liquid cooling plate 10 of the liquid cooling assembly, the second liquid cooling plate 20 of the liquid cooling assembly and the reinforcing plate 30 of the liquid cooling assembly are all provided with second connecting holes 42, and the frame 60 and the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 are connected and fixed by fasteners penetrating the second connecting holes 42. In the application, the second connecting holes 42 are FDS (rotary tapping riveting) holes, and such arrangement can ensure the connection strength of the frame 60, the first liquid cooling plate 10 of the liquid cooling assembly, the first liquid cooling plate 10 of the liquid cooling assembly and the reinforcing plate 30 of the liquid cooling assembly, thereby being conducive to ensuring the structural strength of the whole battery box to meet the use requirements of the battery box.

[0045] In the present application, the second connecting holes 42 are arranged close to the edge of the first liquid cooling plate 10.

[0046] In an embodiment, the second connecting holes 42 are arranged in multiple numbers and are arranged at intervals along the circumference of the first liquid cooling plate 10. By arranging the above structure, the connection of the frame 60, the first liquid cooling plate 10, the second liquid cooling plate 20 and the reinforcing plate 30 can be ensured to be firm, thereby ensuring the stability of the liquid cooling assembly during operation.

[0047] Alternatively, the frame 60 can also be arranged to be welded and fixed with the first liquid cooling plate 10, and the specific connection condition should be selected according to the use environment of the device, as long as the use requirements of the device can be met.

[0048] In an embodiment, the frame 60 comprises a first side frame 62, a second side frame 63 and a third side frame 64 connected in sequence, the first side frame 62 and the third side frame 64 are respectively located on both sides of the first liquid cooling plate 10, and the first side frame 62 and the third side frame 64 are respectively provided with a containing structure 70 between the outer side wall and the inner side wall, and the containing structure 70 is used for containing the liquid cooling pipe. In this way, the space of the first side frame 62 and the third side frame 64 is reasonably utilized, so as to save the occupied space of the liquid cooling pipe.

[0049] In an embodiment, the material of the frame 60 comprises aluminum or steel, and the material of the liquid cooling pipe comprises steel or rubber, wherein the inner wall of the liquid cooling pipe is further provided with an isolation coating. In this way, the frame 60 will not react with the liquid cooling pipe, and the isolation coating can also prevent the chemical reaction between the cooling liquid and the liquid cooling pipe, so as to ensure the stability of the cooling liquid flowing in the liquid cooling pipe, thereby facilitating the cooling of the battery module 100 to maintain the stable operation of the battery module 100.

[0050] Specifically, the containing structure 70 is a circular hole and / or a square hole. In this application, the containing structure 70 is a circular hole. Of course, the containing structure 70 should be arranged according to the shape of the liquid cooling pipe, so as to improve the applicability and scope of the containing structure 70.

[0051] In an embodiment, the containing structure 70 has a plurality of containing structures 70 arranged in sequence along the second direction, and the second direction is parallel to the height direction of the frame 60. In this way, as many liquid cooling pipes as possible can be accommodated, thereby meeting the accommodation requirements of the device.

[0052] Further, the first side frame 62 and / or the third side frame 64 is an extruded aluminum profile structure. Because the extrusion forming can improve the organizational structure of aluminum and improve its mechanical properties. After quenching and aging, the mechanical properties in the longitudinal direction (extrusion direction) are much higher than those of similar products produced by other processing methods, so as to improve the structural strength of the device in this application and ensure the safety during use. At the same time, the size precision of the extruded product is high, and the surface quality is good, so as to meet the use requirements of the device.

[0053] In an embodiment, the inner side wall of the first side frame 62 and / or the third side frame 64 is provided with a buffer 80. In this application, the buffer 80 is specifically a foam, which can prevent the side wall of the battery module 100 from colliding with the inner side wall of the first side frame 62 and / or the third side frame 64, thereby protecting the structure of the battery module 100 to prolong its service life.

[0054] In the present application, the inner side wall of the first frame 62 and / or the third frame 64 is further provided with a recessed avoiding groove 90 in the first direction, and the avoiding groove 90 extends in the second direction. In this way, when the battery module 100 is moved into the accommodating cavity 61 by the external clamp, the avoiding groove 90 can allow the clamp to extend into the accommodating cavity 61, thereby facilitating the transfer of the battery module 100 from the outside to the accommodating cavity 61.

[0055] As shown in FIG. 6, in a third aspect, the embodiments of the present application provide a battery pack, which comprises the battery box described above, the battery module 100, and is arranged in the battery box.

[0056] By applying the technical solutions of the present application, the flow channel groove 21 is arranged on the second liquid cooling plate 20, and the flow channel groove 21 is arranged protruding from the second liquid cooling plate 20 in a direction away from the first liquid cooling plate 10. In this way, when the battery module 100 deforms to generate an expansion force, the flow channel groove 21 can be prevented from being extruded by the excessive expansion force to deform, thereby protecting the flow channel groove 21. Meanwhile, the reinforcing plate 30 is arranged below the second liquid cooling plate 20, and the end face of the reinforcing plate 30 towards the second liquid cooling plate 20 is provided with an accommodating groove 31 corresponding to the flow channel groove 21. In this way, the protruding flow channel groove 21 can be protected, and damage to the structure of the flow channel groove 21 caused by vibration and impact can be prevented. Therefore, the service life of the liquid cooling assembly can be improved, and the heat dissipation effect of the battery module 100 can be ensured.

Claims

1. A liquid cooling assembly, comprising: a first liquid cooling plate; a second liquid cooling plate arranged below and connected with the first liquid cooling plate, an end surface of the second liquid cooling plate facing the first liquid cooling plate is provided with a flow channel groove, a bottom of the flow channel groove is arranged protruding the second liquid cooling plate in a direction away from the first liquid cooling plate; a reinforcing plate arranged below and connected with the second liquid cooling plate, an end surface of the reinforcing plate facing the second liquid cooling plate is provided with a receiving groove corresponding to the bottom of the flow channel groove, the receiving groove is used for accommodating the part of the flow channel groove protruding the second liquid cooling plate.

2. The liquid cooling assembly of claim 1, wherein, The first liquid cooling plate and / or the second liquid cooling plate are formed by tailor-welding a plurality of metal structures.

3. The liquid cooling assembly of claim 2, wherein, The cross-sectional shape of the metal structure comprises a trapezoidal shape.

4. The liquid cooling assembly of claim 1, wherein, The cross-section of the flow channel groove along a first direction is a continuous U-shaped structure, the first direction is parallel to the length direction of the second liquid cooling plate.

5. The liquid cooling assembly of any of claims 1-4, wherein, The first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are all provided with first connecting holes, the first connecting holes of the first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are arranged corresponding to each other, and the first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are connected and fixed by a connecting piece penetrating through the first connecting holes.

6. The liquid cooling assembly of claim 5, wherein, The first connecting hole is arranged at the middle part of the first liquid cooling plate.

7. The liquid cooling assembly of claim 5, wherein, The first connecting hole is arranged in a plurality of forms, and the plurality of first connecting holes are arranged in an array.

8. The liquid cooling assembly of any of claims 1-4, wherein, The liquid cooling assembly further comprises a liquid inlet joint and a liquid outlet joint, the liquid inlet joint and the liquid outlet joint are respectively connected with the flow channel groove.

9. A battery pack, wherein, The battery box comprises: The liquid cooling assembly according to any one of claims 1-8; a frame at least partially surrounding the first liquid cooling plate of the liquid cooling assembly, the frame and the first liquid cooling plate form a receiving cavity, and the receiving cavity is used for accommodating a battery module.

10. The battery pack of claim 9, wherein, The first liquid cooling plate, the second liquid cooling plate and the reinforcing plate of the liquid cooling assembly, and the frame are all provided with second connecting holes, and the frame and the first liquid cooling plate, the second liquid cooling plate and the reinforcing plate are connected and fixed by a fastener penetrating through the second connecting holes.

11. The battery pack of claim 10, wherein, The second connecting hole is arranged close to the edge of the first liquid cooling plate.

12. The battery pack of claim 10, wherein, The second connecting hole is arranged in a plurality of forms, and the plurality of second connecting holes are arranged in an array along the circumferential direction of the first liquid cooling plate.

13. The battery pack of claim 9, wherein, The frame and the first liquid cooling plate are welded and fixed.

14. The battery pack of any one of claims 9-13, wherein, The frame comprises a first side frame, a second side frame and a third side frame connected in sequence, the first side frame and the third side frame are respectively located on both sides of the first liquid cooling plate, and the outer side wall and the inner side wall of the first side frame and the third side frame are both provided with a receiving structure, and the receiving structure is used for accommodating a liquid cooling pipe.

15. The battery pack of claim 14, wherein, The material of the frame comprises aluminum or steel, the material of the liquid cooling pipe comprises steel or rubber, and an isolation coating is further arranged on the inner wall of the liquid cooling pipe.

16. The battery pack of claim 14, wherein, The receiving structure is a circular hole and / or a square hole.

17. The battery pack of claim 14, wherein, The first side frame and / or the third side frame are extruded aluminum profiles.

18. The battery pack of claim 14, wherein, ​ 19. The battery pack of claim 14, wherein, The inner side wall of the first frame and / or the third frame is provided with a buffer.

20. The battery pack of claim 14, wherein, The inner side wall of the first frame and / or the third frame is further provided with a recessed avoiding groove in the first direction, the avoiding groove extending in the second direction, the first direction being perpendicular to the second direction.

21. A battery pack comprising: The battery box of any one of claims 9-20; A battery module disposed in the battery box.

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