Immersed cooling battery pack

Abstract

The utility model relates to the technical field of power batteries, in particular to an immersed cooling battery pack which comprises a lower box body, a lower sash, a battery cell and an upper sash which are sequentially arranged from bottom to top. The lower sash is arranged in the sash accommodating cavity of the lower box body, the battery cell is arranged in the battery cell accommodating cavity of the lower sash, the upper sash is arranged above the battery cell, and the size of the upper sash is matched with that of the lower sash. The cooling efficiency of the battery pack is improved in an immersion cooling mode, and the specific structure is as follows: the lower frame lattice is arranged at the bottom of the lower box body, so that the movement of the battery cells in the X and Y directions can be limited, the whole pack mode of the battery pack is increased, and the structural stability is improved. And the upper part of the battery cell is provided with the structure of the upper sash, the sealant and the upper pressing plate, so that the problem that cooling liquid is difficult to flow in the battery cell due to too small gap of the battery cell is avoided, and the sealing reliability of the structure is ensured. Therefore, the battery pack can solve the technical problems that an existing battery pack is poor in heat dissipation effect and low in heat transfer efficiency.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to an immersion-cooled battery pack. Background Technology

[0002] Currently, power battery packs generally consist of a casing and multiple battery cells housed within it. Liquid cooling is a commonly used battery cooling method within battery packs, which involves installing water-cooled plates inside the casing for cooling or heating.

[0003] However, a single liquid cooling plate can only handle the heat dissipation of one or two battery cells, resulting in limited heat dissipation capacity and poor heat dissipation effect. Moreover, the heat transfer efficiency of using water cooling plates for cooling or heating is relatively low. Utility Model Content

[0004] The purpose of this invention is to provide an immersion-cooled battery pack that can solve the technical problems of poor heat dissipation and low heat transfer efficiency in existing battery packs.

[0005] To achieve the above objectives, the present invention provides an immersion-cooled battery pack, comprising a lower housing, a lower frame, a battery cell, and an upper frame arranged sequentially from bottom to top. The lower frame is disposed within the frame receiving cavity of the lower housing, the battery cell is disposed within the battery cell receiving cavity of the lower frame, and the upper frame is disposed above the battery cell. The upper frame is matched in size with the lower frame.

[0006] As a preferred embodiment, the lower housing includes a bottom plate, an outer frame, a front beam, and a rear beam. The outer frame is located at the outer edge of the bottom plate, and the front and rear beams are arranged parallel to each other at the upper end of the bottom plate. The two sides of the front and rear beams are connected to the outer frame, and the front and rear beams, the bottom plate, and the two sides of the outer frame together form a frame to accommodate the cavity.

[0007] As a preferred embodiment, the lower frame includes a left beam, a right beam, a front crossbeam, a rear crossbeam, and a frame base plate. The left beam and the right beam are respectively located inside the outer frame. The front crossbeam and the rear crossbeam have a hollow structure inside and are respectively located inside the front beam and the rear beam. The frame base plate is located at the upper end of the box bottom plate. The left beam, the right beam, the front crossbeam, the rear crossbeam, and the frame base plate together form a cell housing cavity.

[0008] Furthermore, the front beam is provided with a liquid inlet communicating with the front crossbeam, and the rear beam is provided with a liquid outlet communicating with the rear crossbeam.

[0009] Furthermore, the front crossbeam and the rear crossbeam are respectively provided with vertical notches on their inner sides, and the size of the vertical notches matches the gap between two adjacent battery cells.

[0010] Further, the left beam, the right beam, the front cross beam and the rear cross beam have equal height.

[0011] Further, the height of the lower frame is less than the height of the frame receiving cavity.

[0012] Further, the height difference between the lower frame and the frame receiving cavity is equal to the thickness of the upper frame.

[0013] As a preferred solution, the immersion-cooled battery pack further comprises an upper pressing plate arranged above the upper frame and bonded to the upper frame by a sealing adhesive.

[0014] The utility model discloses beneficial effect has:

[0015] The utility model provides a kind of immersion-cooled battery pack, the cooling efficiency of battery pack is improved by the way of immersion cooling, specific structure: ①lower frame is arranged in lower box bottom, and the movement of X and Y direction of battery cell can be limited, the whole package modal of battery pack is increased, and structural stability is improved.②In the upper portion of battery cell, the structure of upper frame+sealing adhesive+upper pressing plate is arranged, avoid the problem that cooling liquid is difficult to flow in due to the too small gap between battery cell, and guarantee the sealing reliability of structure.

[0016] Therefore, the utility model can solve the technical problems that the existing battery pack has poor heat dissipation effect and low heat transfer efficiency. DRAWINGS

[0017] Figure 1 It is the explosion schematic diagram of the utility model.

[0018] Figure 2 It is the plane schematic diagram of the utility model.

[0019] Figure 3 It is the three-dimensional schematic diagram of lower box and lower frame.

[0020] Figure 4 It is Figure 3 It is the enlarged schematic diagram at A.

[0021] Figure 5 It is the plane schematic diagram of lower box and lower frame.

[0022] Mark explanation:

[0023] Lower box 1, lower frame 2, battery cell 3, upper frame 4, sealing adhesive 5, upper pressing plate 6;

[0024] Lower box 1: frame receiving cavity 11, box bottom plate 12, outer frame 13, front beam 14, rear beam 15, liquid inlet 16, liquid outlet 17;

[0025] The lower frame 2 includes a battery cell accommodating cavity 21, a left side beam 22, a right side beam 23, a front cross beam 24, a rear cross beam 25, a frame bottom plate 26, and a vertical notch 27. DETAILED DESCRIPTION

[0026] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, rather than limit the utility model. In addition, it needs to be explained that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, rather than all.

[0027] In the description of the utility model, it needs to be explained that, the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model in that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0028] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] As shown in Figure 1 , 2 The utility model provides a kind of battery pack of immersion cooling, including by lower and upper sequentially arranged lower box 1, lower frame 2, battery cell 3, upper frame 4, sealing glue 5, upper pressing plate 6, the lower frame 2 is arranged in the frame accommodating cavity 11 of lower box 1, the battery cell 3 is arranged in the battery cell accommodating cavity 21 of lower frame 2, the upper frame 4 is arranged above battery cell 3, and the size of upper frame 4 is matched with lower frame 2. The upper pressing plate 6 is arranged above upper frame 4, and is bonded with upper frame 4 by sealing glue 5.

[0030] As shown in Figure 3 , 5As shown, the lower box 1 includes a box bottom plate 12, an outer frame 13, a front edge beam 14, and a rear edge beam 15. The outer frame 13 is arranged at the outer edge of the box bottom plate 12. The front edge beam 14 and the rear edge beam 15 are arranged in parallel at the upper end of the box bottom plate 12. The two sides of the front edge beam 14 and the rear edge beam 15 are connected to the outer frame 13. The front edge beam 14, the rear edge beam 15, the box bottom plate 12, and the two sides of the outer frame 13 form a frame containing cavity 11. The front edge beam 14 is provided with a liquid inlet 16 communicating with a front cross beam 24. The rear edge beam 15 is provided with a liquid outlet 17 communicating with a rear cross beam 25.

[0031] As shown in Figure 3 , 5 As shown, the lower frame 2 includes a left edge beam 22, a right edge beam 23, a front cross beam 24, a rear cross beam 25, and a frame bottom plate 26. The left edge beam 22 and the right edge beam 23 are arranged inside the outer frame 13. The front cross beam 24 and the rear cross beam 25 are hollow structures. The front cross beam 24 and the rear cross beam 25 are arranged inside the front edge beam 14 and the rear edge beam 15, respectively. The frame bottom plate 26 is arranged at the upper end of the box bottom plate 12. The frame bottom plate 26 is provided with a plurality of battery cell mounting grooves. The left edge beam 22, the right edge beam 23, the front cross beam 24, the rear cross beam 25, and the frame bottom plate 26 form a battery cell containing cavity 21. The inner sides of the front cross beam 24 and the rear cross beam 25 are respectively provided with vertical notches 27. The size of the vertical notches 27 matches the gap between two adjacent battery cells 3. The heights of the left edge beam 22, the right edge beam 23, the front cross beam 24, and the rear cross beam 25 are equal.

[0032] As shown in Figure 4 The height of the lower frame 2 is less than the height of the frame containing cavity 11, forming a stepped surface. That is, the heights of the left edge beam 22 and the right edge beam 23 are less than the height of the outer frame 13. The heights of the front cross beam 24 and the rear cross beam 25 are less than the heights of the front edge beam 14 and the rear edge beam 15, respectively. The height difference between the lower frame 2 and the frame containing cavity 11 is equal to the thickness of the upper frame 4.

[0033] The connection mode of the battery pack is as follows:

[0034] The lower box bottom plate is connected to the edge beams and cross beams of the lower frame by friction stir welding or other sealing methods. The edge beams and cross beams of the lower frame are connected by arc welding, and the connection position is sealed. The lower frame is clamped in the lower box bottom plate by interference fit. The battery cells are placed in the lower frame, and the lower frame is used to limit the transverse and longitudinal movement of the battery cells.

[0035] The left and right edge beams and the front and rear cross beams of the lower frame have a step with a depth greater than 5 mm from the lower box. The upper frame is clamped into the gap between the battery cells and placed on the step.

[0036] The upper frame is sealed by sealant, and the upper cover plate is connected to the lower box body by screwing, clamping or the like.

[0037] The liquid inlet and the liquid outlet are arranged on the rear beam and the front beam of the lower box body respectively; and vertical notches are formed on the front beam and the rear beam of the lower box body at positions corresponding to the gaps between the battery cells, as the liquid inlets and outlets.

[0038] The working mode of the battery pack is as follows:

[0039] The cooling liquid enters the front beam cavity through the liquid inlet, enters the gap between the battery cells through the notch of the front beam, and then enters the rear beam cavity through the gap between the battery cells, and finally is discharged from the liquid outlet.

[0040] The utility model has the advantages of:

[0041] The lower bottom plate and the beam are sealed by friction stir welding, the beams are sealed by arc welding, the beams and the middle beam are sealed by arc welding, and the upper gap of the battery cell is sealed by sealant.

[0042] ①The lower frame arranged at the bottom of the lower box body can limit the movement of the battery cell in the X and Y directions, increase the overall modal, and improve the structural stability.

[0043] ②The upper frame, sealant and upper cover plate arranged at the upper part of the battery cell can avoid the problem that the cooling liquid cannot flow in the small gap between the battery cells and ensure the sealing reliability of the structure.

[0044] ③The steps arranged on the beam and the beam can limit the Z-direction movement of the upper frame, and the width of the step should be greater than 5mm to ensure the sealing performance.

[0045] ④Vertical notches are formed on the side of the front beam and the rear beam corresponding to the battery cell, and the notch position corresponds to the gap between the battery cells.

[0046] The above-described embodiments only express several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the utility model patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, some modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A battery pack with immersion cooling, characterized in that: The device includes a lower housing (1), a lower frame (2), a battery cell (3), and an upper frame (4) arranged sequentially from bottom to top. The lower frame (2) is located inside the frame receiving cavity (11) of the lower housing (1), the battery cell (3) is located inside the battery receiving cavity (21) of the lower frame (2), and the upper frame (4) is located above the battery cell (3). The upper frame (4) is the same size as the lower frame (2). The lower frame (2) includes a front crossbeam (24) and a rear crossbeam (25). The front crossbeam (24) and the rear crossbeam (25) have hollow structures inside. The front crossbeam (24) and the rear crossbeam (25) are respectively provided with vertical notches (27) on their inner sides. The size of the vertical notches (27) matches the gap between two adjacent battery cells (3). The lower box (1) includes a front side beam (14) and a rear side beam (15). The front side beam (14) is provided with a liquid inlet (16) communicating with the front crossbeam (24), and the rear side beam (15) is provided with a liquid outlet (17) communicating with the rear crossbeam (25). Coolant enters the cavity of the front crossbeam (24) through the inlet (16), enters the cell gap through the notch of the front crossbeam (24), and after being fully mixed in the cell gap, enters the cavity of the rear crossbeam (25) through the gap of the rear crossbeam, and finally exits through the outlet (17) from the cavity of the rear crossbeam (25), thereby achieving cooling of the battery pack.

2. The immersion-cooled battery pack according to claim 1, characterized in that: The lower box (1) also includes a box bottom plate (12) and an outer frame (13). The outer frame (13) is set on the outer edge of the box bottom plate (12). The front side beam (14) and the rear side beam (15) are set parallel to each other on the upper end of the box bottom plate (12). The two sides of the front side beam (14) and the rear side beam (15) are connected to the outer frame (13). The front side beam (14), the rear side beam (15), the box bottom plate (12), and the outer frame (13) together form a frame to accommodate the cavity (11).

3. The immersion-cooled battery pack according to claim 2, characterized in that: The lower frame (2) also includes a left beam (22), a right beam (23), and a frame bottom plate (26). The left beam (22) and the right beam (23) are respectively located on the inner side of the outer frame (13). The front crossbeam (24) and the rear crossbeam (25) are respectively located on the inner side of the front side beam (14) and the rear side beam (15). The frame bottom plate (26) is located at the upper end of the box bottom plate (12). The left beam (22), the right beam (23), the front crossbeam (24), the rear crossbeam (25), and the frame bottom plate (26) together form a cell housing cavity (21).

4. The immersion-cooled battery pack according to claim 3, characterized in that: The left beam (22), right beam (23), front crossbeam (24), and rear crossbeam (25) are all of equal height.

5. The immersion-cooled battery pack according to claim 1, characterized in that: The height of the lower frame (2) is less than the height of the frame housing cavity (11).

6. The immersion-cooled battery pack according to claim 5, characterized in that: The height difference between the lower frame (2) and the frame cavity (11) is equal to the thickness of the upper frame (4).

7. The immersion-cooled battery pack according to claim 1, characterized in that: The immersion-cooled battery pack also includes an upper pressure plate (6), which is disposed above the upper frame (4) and is bonded to the upper frame (4) by sealant (5).

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