Liquid cooling lower box body structure and lithium battery pack

Abstract

The utility model relates to the technical field of lithium battery packs, in particular to a liquid cooling lower box body structure which comprises an edge beam body, a surface plate, a liquid cooling plate and a protection plate which are sequentially arranged from top to bottom, wherein the liquid cooling plate is provided with a concave part, a flow channel fin is installed in the concave part, the periphery of the surface plate is connected with the plane part of the liquid cooling plate in a sealing mode so that a cavity can be formed in the concave part, and two water nozzle switching blocks are fixedly installed at the side end of the surface plate. The stamping die forming machining scheme is high in machining speed, high in production efficiency, good in product consistency and more suitable for large-scale production, in addition, the front edge beam, the rear edge beam and the side edge beams adopt the profile aluminum extrusion technology and the profile aluminum extrusion machining scheme, the product consistency is good, the used six-series aluminum alloy is better in structural strength, and the service life is prolonged. And the requirement of the liquid cooling lower box body on the structural strength in the vertical direction can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery packs, and in particular to a liquid-cooled lower box structure and a lithium battery pack. Background Art

[0002] With the continuous development of the energy storage industry, energy storage device technologies, led by lithium-ion batteries, are increasingly being used in energy storage systems. During actual operation, the lower case of the lithium battery pack houses the energy storage device and provides heat dissipation and insulation. To meet the high performance, safety, and long life requirements of lithium batteries, liquid cooling systems are widely used in lithium battery packs to provide superior heat dissipation.

[0003] The existing liquid cooling lower box structure is complex to manufacture and has low production efficiency. Traditional liquid cooling plate processing methods often require multiple steps, resulting in extended production cycles and unfavorable for large-scale production. Therefore, there are still certain limitations in terms of structural simplicity and low cost. Utility Model Content

[0004] The purpose of the present invention is to solve the shortcomings of the prior art in terms of structural simplicity and low cost, and to propose a liquid-cooled lower box structure and a lithium battery pack.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] Design a liquid cooling lower box structure, including a side beam, a flat plate, a liquid cooling plate and a protective plate arranged in sequence from top to bottom;

[0007] Among them, the liquid cooling plate has a recessed portion, in which a flow channel fin is installed, and the four sides of the flat plate are sealedly connected to the flat portion of the liquid cooling plate to form a cavity at the recessed portion, and two water nozzle adapter blocks are fixedly installed on the side ends of the flat plate, and the two water nozzle adapter blocks are connected to the cavity. The liquid cooling plate is an integrated stamped part.

[0008] Furthermore, the side beam body includes a front side beam, a rear side beam and two side beams;

[0009] The front side beam, the rear side beam and the two side beams are in contact with the plane plate, and the tops thereof are all located in the same plane.

[0010] Furthermore, the protective plate includes a protective bottom plate and a side plate connected to the protective bottom plate; the protective bottom plate and the side plate enclose a portion required for the dry liquid cooling plate, and connection holes are opened on the side plates corresponding to the two side beams.

[0011] Furthermore, an open side is formed between the protective bottom plate and the top of the side plate, and a support portion is extended at the open side. The front side beam has a bent surface, and the bent surface stops on the outside of the support portion. A notch is provided on the bent surface for the faucet adapter block to pass through.

[0012] Furthermore, the front side beam is configured as a profile body, a mounting channel is provided at the bottom of the front side beam, the support block is installed in the mounting channel, and a connecting hole is provided at the top of the front side beam that sequentially passes through the support block and the support portion;

[0013] Wherein, a support block is further provided between the support portion and the front side beam.

[0014] Furthermore, the liquid cooling plate, flat plate, and faucet adapter block are all made of three-series aluminum alloy parts, and the front side beam, rear side beam, and side beam are all made of six-series aluminum alloy parts.

[0015] Furthermore, reserved holes for fixing to the upper box body are provided on the sides of the front side beam, the rear side beam and the two side beams, and / or wire brace holes for fixing to the energy storage device are provided on the front side beam and the rear side beam.

[0016] Furthermore, an insulating paint layer is sprayed on the top of the side beam body and the plane plate.

[0017] Furthermore, a thermal insulation coating is provided on the bottom of the liquid cooling plate.

[0018] In addition, the present invention also proposes a lithium battery pack, which includes a box body, battery cells placed in the box body, and the above-mentioned liquid-cooled lower box body structure. The liquid-cooled lower box body structure is installed at the bottom of the box body, and a cover plate is also fixedly installed on the top of the box body.

[0019] The liquid cooling lower box structure and lithium battery pack proposed in this utility model have the following beneficial effects:

[0020] The liquid cooling plate in this utility model adopts a stamping forming process and a stamping die forming processing scheme, which has a fast processing speed and high production efficiency, and has good product consistency, making it more suitable for large-scale production. In addition, the front side beams, rear side beams and side beams adopt a profile aluminum extrusion process and a profile aluminum extrusion processing scheme, which has good product consistency. The six-series aluminum alloy used has better structural strength and can meet the structural strength requirements of the liquid cooling lower box in the vertical direction.

[0021] By spraying an insulating paint layer, the battery pack has better insulation and voltage resistance performance. Secondly, by spraying a thermal insulation coating, the battery pack has better thermal insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic diagram of the explosion structure of the utility model;

[0023] Figure 2 The three-dimensional Figure 1 ;

[0024] Figure 3 The three-dimensional Figure 2 .

[0025] In the figure: 1. Side beam body; 11. Front side beam; 111. Bending surface; 112. Support block; 113. Installation channel; 12. Rear side beam; 13. Side beam; 14. Reserved hole; 15. Wire sleeve hole; 2. Flat plate; 21. Water nozzle adapter block; 3. Liquid cooling plate; 31. Recessed part; 32. Flow channel fin; 4. Protective plate; 41. Support part; 5. Thermal insulation coating. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] Reference Figure 1-3 This is an embodiment of the present invention, which discloses a liquid cooling lower box structure, which includes a side beam body 1, a flat plate 2, a liquid cooling plate 3 and a protective plate 4 arranged in sequence from top to bottom;

[0028] Among them, the liquid cooling plate 3 has a recessed portion 31, in which a flow channel fin 32 is installed. The four sides of the flat plate 2 are sealed and connected to the flat portion of the liquid cooling plate 3 to form a cavity at the recessed portion 31. Two water nozzle adapter blocks 21 are fixedly installed on the side ends of the flat plate 2. The two water nozzle adapter blocks 21 are connected to the cavity. Specifically, the two water nozzle adapter blocks 21 are used to connect the circulating coolant. The coolant flows in the cavity and is guided and heat-exchanged through the flow channel fins 32 to realize liquid cooling of the battery cell.

[0029] In some embodiments, the side beam body 1 of the present invention includes a front side beam 11, a rear side beam 12 and two side beams 13, wherein the front side beam 11, the rear side beam 12 and the two side beams 13 together form a frame structure, and the two side beams 13 are attached to both sides of the front side beam 11 and the rear side beam 12;

[0030] The front side beam 11 , the rear side beam 12 and the two side beams 13 are in contact with the flat panel 2 , and their tops are all located in the same plane.

[0031] On the basis of the above embodiment, the protective plate includes a protective bottom plate and a side plate connected to the protective bottom plate; the protective bottom plate and the side plates enclose a container portion for a dry liquid cooling plate, and connection holes are provided on the side plates corresponding to the two side beams 13. Specifically, both sides of the protective plate 4 are provided with bent edges, and the holes are provided on the bent edges. Of course, technical personnel in the relevant field know that corresponding bent edges and holes should also be provided on the side beams 13, and the upper and lower holes correspond to each other, so as to form a reserved hole 14 for connecting the box body after the overall assembly.

[0032] Furthermore, in this embodiment, an open side is formed between the protective bottom plate and the top of the side plate, and a support portion 41 is further extended at the open side, and the extension direction is horizontal. The front side beam 11 has a bent surface 111, and the bent surface 111 stops on the outside of the support portion 41. A notch for the faucet adapter block 21 to pass through is opened on the bent surface 111, that is, in this embodiment, the support portion 41 is used in conjunction with the front side beam 11 to shield and protect the faucet adapter block 21. Since most of the faucet adapter block 21 is built into the inner side of the bent surface 111, this can avoid the faucet adapter block 21 from protruding out, affecting the appearance and safety.

[0033] Among them, a support block 112 is further arranged between the support portion 41 and the front side beam 11, and the support block 112 is used to strengthen the connection strength between the support portion 41 and the front side beam 11 to improve the protection stability of the faucet adapter block 21. Preferably, the support blocks 112 described in this embodiment are provided with four, and of course the support portions 41 are also provided with four, among which the two middle support portions 41 are widened, and their purpose is to shield and protect the bottom of the faucet adapter block 21.

[0034] In some embodiments, the front side beam 11 in the present invention is configured as a profile body, and a mounting channel 113 is provided at the bottom of the front side beam 11, the support block 112 is installed in the mounting channel 113, and a connecting hole is provided at the top of the front side beam 11 that passes through the support block 112 and the support portion 41 in sequence.

[0035] In addition, the liquid cooling plate 3, the flat plate 2, and the faucet adapter block 21 in this embodiment are all made of three-series aluminum alloy parts, and the front side beam 11, the rear side beam 12, and the side beam 13 are all made of six-series aluminum alloy parts.

[0036] To facilitate subsequent assembly, in this embodiment, reserved holes 14 for fixing to the upper box body are provided on the sides of the front side beam 11, the rear side beam 12 and the two side beams 13, and / or wire brace holes 15 for fixing to the energy storage device are provided on the front side beam 11 and the rear side beam 12.

[0037] In some embodiments, in the utility model, an insulating paint layer is sprayed on the top of the side beam 1 and the plane plate 2. The insulating paint layer can be set to materials such as silicone rubber insulating paint or polyurethane insulating paint. The purpose of spraying the insulating paint layer is to improve the insulation performance of the structure and prevent leakage or electrochemical corrosion. This is a common technical measure in electrical equipment.

[0038] Of course, in order to achieve the bottom insulation operation of the liquid cooling plate 3, the liquid cooling plate 3 in this embodiment is an integrated stamping part. The liquid cooling plate 3 adopts a stamping forming process and a stamping die forming processing scheme, which has a fast processing speed and high production efficiency, good product consistency, and is more suitable for large-scale production.

[0039] A thermal insulation coating 5 is provided at the bottom of the liquid cooling plate 3 , and the thermal insulation coating is made of foamed polyurethane material.

[0040] The specific assembly of the liquid cooling lower box includes the following steps:

[0041] S10: using a stamping die to stamp the plate into shape to prepare a liquid cooling plate 3;

[0042] S20: Extruding the aluminum ingot into profile strips using a profile mold, and then subjecting the strips to aging treatment, sawing, and CNC machining to prepare a front side beam 11, a rear side beam 12, and two side beams 13;

[0043] S30: Prepare the faucet adapter block 21 by CNC machining the block raw material;

[0044] S40: placing the flat plate 2 on the liquid cooling plate 3, placing the flow channel fins 32 between the liquid cooling plate 3 and the flat plate 2, then placing the two faucet adapter blocks 21 on the flat plate 2, and fixing the four together by brazing;

[0045] S50: placing the front side beam 11, the rear side beam 12 and the two side beams 13 on the flat plate 2 through tooling positioning, and fixing and sealing them on the flat plate 2 by laser welding;

[0046] S60: placing the four support blocks 112 in the mounting channel 113 at the bottom of the front side beam 11 and fixing them to the front side beam 11 by laser welding;

[0047] S70: Spray insulating paint on the top of the entire liquid-cooled lower box;

[0048] S80: Spraying a thermal insulation material onto the bottom of the liquid cooling plate 3 to form the thermal insulation coating.

[0049] That is, in this embodiment, the liquid cooling plate 3, the flow channel fin 32, the flat plate 2 and the water nozzle adapter block 21 are positioned by tooling and fixedly connected by brazing in one step, which ensures the structural strength while facilitating the mass production of the liquid cooling lower box.

[0050] The entire side beam body 1 is laser welded and sealed to the flat plate by a robotic arm. Automated laser welding helps to improve the production efficiency of the liquid-cooled lower box and reduce risks in the manufacturing process. While ensuring the production efficiency and yield rate of the energy storage lower box, it can also reduce the workload of operators, reduce hidden dangers in the production process, improve the working environment, and protect the personal health of operators.

[0051] Furthermore, this embodiment also discloses a lithium battery pack, including a box body, battery cells placed in the box body, and the above-mentioned liquid-cooled lower box body structure. The liquid-cooled lower box body structure is installed at the bottom of the box body, and a cover plate is also fixedly installed on the top of the box body.

[0052] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid cooling lower box structure, characterized in that: It comprises a side beam body (1), a plane plate (2), a liquid cooling plate (3) and a protective plate (4) which are arranged in sequence from top to bottom; The liquid cooling plate (3) has a recessed portion (31), in which a flow channel fin (32) is installed. The four sides of the flat plate (2) are sealed and connected to the flat portion of the liquid cooling plate (3) to form a cavity at the recessed portion (31). Two water nozzle adapter blocks (21) are fixedly installed at the side ends of the flat plate (2), and the two water nozzle adapter blocks (21) are connected to the cavity. The liquid cooling plate (3) is an integrated stamped part.

2. The liquid cooling lower box structure according to claim 1, characterized in that: The side beam body (1) comprises a front side beam (11), a rear side beam (12) and two side beams (13); The front side beam (11), the rear side beam (12) and the two side beams (13) are in contact with the plane plate (2), and the tops thereof are all located in the same plane.

3. The liquid cooling lower box structure according to claim 2, characterized in that: The protective plate comprises a protective bottom plate and side plates connected to the protective bottom plate; the protective bottom plate and the side plates enclose a portion for containing a dry liquid cooling plate, and connection holes are provided on the side plates corresponding to the two side beams (13).

4. The liquid cooling lower box structure according to claim 3, characterized in that: An open side is formed between the protective bottom plate and the top of the side plate, and a support portion (41) is extended from the open side. The front side beam (11) has a bent surface (111), and the bent surface (111) is stopped at the outside of the support portion (41). A notch is formed on the bent surface (111) for the faucet adapter block (21) to pass through.

5. The liquid cooling lower box structure according to claim 4, characterized in that: The front side beam (11) is configured as a profile body, and a mounting channel (113) is provided at the bottom of the front side beam (11). A support block (112) is further provided between the support portion (41) and the front side beam (11), and the support block (112) is installed in the mounting channel (113). A connecting hole is provided at the top of the front side beam (11) and passes through the support block (112) and the support portion (41) in sequence.

6. The liquid cooling lower box structure according to claim 2, characterized in that: The liquid cooling plate (3), the flat plate (2), and the water nozzle adapter block (21) are all three-series aluminum alloy parts, and the front side beam (11), the rear side beam (12), and the side beam (13) are all six-series aluminum alloy parts.

7. The liquid cooling lower box structure according to claim 2, characterized in that: Pre-set holes (14) for fixing to the upper box body are provided on the sides of the front side beam (11), the rear side beam (12) and the two side beams (13), and / or wire brace holes (15) for fixing to the energy storage device are provided on the front side beam (11) and the rear side beam (12).

8. The liquid cooling lower box structure according to claim 1, characterized in that: An insulating paint layer is sprayed on the top of the side beam body (1) and the plane plate (2).

9. The liquid cooling lower box structure according to claim 1, characterized in that: A thermal insulation coating (5) is provided on the bottom of the liquid cooling plate (3).

10. A lithium battery pack, characterized in that: It comprises a box body, a battery cell placed in the box body and a liquid-cooled lower box body structure according to any one of claims 1 to 9, wherein the liquid-cooled lower box body structure is installed at the bottom of the box body, and a cover plate is fixedly installed on the top of the box body.

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