Laminated battery pack

Abstract

The utility model provides a laminated battery pack. The laminated battery pack comprises a plurality of single-layer battery packs, the single-layer battery pack comprises a box body frame, a first liquid cooling plate, a second liquid cooling plate and a battery module; the box body frame comprises four supporting beams which are sequentially connected end to end; the first liquid cooling plate is arranged at the bottom of the box body frame, the plurality of battery modules are arranged on the first liquid cooling plate, a second liquid cooling plate is arranged between every two adjacent battery modules, and heat conduction pads are arranged on the battery modules in the single-layer battery pack; the plurality of single-layer battery packs are stacked, the box body frame of the single-layer battery pack at the upper layer is aligned with the box body frame of the single-layer battery pack at the lower layer, and the first liquid cooling plate of the single-layer battery pack at the upper layer is pressed on the heat conduction pad of the single-layer battery pack at the lower layer; and a cover plate covers the single-layer battery pack on the top layer. According to the utility model, the temperature of the high-level battery pack can be reduced, and the problem of large temperature difference in the laminated battery pack is solved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically to a stacked battery pack. Background Technology

[0002] In the commercial vehicle market, to achieve high capacity and high voltage platforms, multi-layered battery packs with large capacity and high voltage platforms are often used. However, this multi-layered approach presents several challenges. For instance, the bottom battery pack bears a significant weight, requiring consideration of its structural and support strength. Furthermore, as the packs are stacked, the overall center of gravity shifts upwards, necessitating consideration of instability during movement and the strength of connections between the packs. Additionally, the heat dissipation of the middle packs decreases, while the temperature of the higher-level packs gradually increases, resulting in a significant temperature difference across the entire battery pack. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the prior art by proposing a stacked battery pack that can reduce the temperature of the high-position battery pack and minimize the problem of large temperature differences within the stacked battery pack.

[0004] This utility model proposes a stacked battery pack, comprising several single-layer battery packs; each single-layer battery pack includes a housing frame, a first liquid cooling plate, a second liquid cooling plate, and battery modules; the housing frame includes four support beams connected end-to-end in sequence; the first liquid cooling plate is disposed at the bottom of the housing frame, the several battery modules are arranged on the first liquid cooling plate, and a second liquid cooling plate is disposed between two adjacent battery modules; a thermally conductive pad is disposed on each battery module within the single-layer battery pack; the several single-layer battery packs are stacked, with the housing frame of the upper single-layer battery pack aligned with the housing frame of the lower single-layer battery pack, and the first liquid cooling plate of the upper single-layer battery pack pressing against the thermally conductive pad of the lower single-layer battery pack; a cover plate is provided on the top single-layer battery pack.

[0005] The preferred technical solution of this utility model is as follows: the battery module includes a number of battery cells arranged in a row, and the thermal pad is laid on top of the battery cells.

[0006] The preferred technical solution of this utility model is that the height of the second liquid cooling plate is the same as the height of the battery cell.

[0007] The preferred technical solution of this utility model is as follows: a positioning plate is provided inside the box frame, the two ends of the positioning plate are fixedly connected to the support beam, and the battery module is disposed between the two positioning plates.

[0008] The preferred technical solution of this utility model is as follows: the support beam includes a side plate and an auxiliary beam disposed on the side plate. The side plate is a sandwich structure, and a horizontally arranged connecting plate is disposed inside it. Several connecting plates are spaced apart along the height direction of the side plate.

[0009] The preferred technical solution of this utility model is as follows: support ridges are respectively provided at the top and bottom of the side plate, the two support ridges are located on the same end face of the side plate, the auxiliary beam is vertically arranged between the two support ridges, and a plurality of auxiliary beams are spaced apart along the length direction of the side plate.

[0010] The preferred technical solution of this utility model is as follows: a plurality of connecting holes are provided on the supporting edge, and bolts are provided in the connecting holes for connecting the box frames of two adjacent single-layer battery packs.

[0011] The preferred technical solution of this utility model is as follows: In each of the single-layer battery packs, a sealing ring is provided on the housing frame, and the sealing ring is provided on the top of the support beam; the sealing ring is pressed between two adjacent housing frames.

[0012] The preferred technical solution of this utility model is that a groove for accommodating the sealing ring is provided at the top of the support beam.

[0013] The preferred technical solution of this utility model is as follows: the support beam is provided with an inlet and an outlet, and the first liquid cooling plate and the second liquid cooling plate are connected in parallel to the inlet and the outlet.

[0014] The stacked battery pack of this utility model has the following beneficial effects:

[0015] 1. In a single-layer battery pack, the first liquid cooling plate is directly set at the bottom of the battery module as the base plate of the housing frame to reduce the thickness and weight of the single-layer battery pack. At the same time, when multiple single-layer battery packs are stacked, the first liquid cooling plate in the upper single-layer battery pack is located on top of the lower single-layer battery pack, which can heat the lower single-layer battery pack and effectively reduce the problems of poor heat dissipation, increased temperature of the single-layer battery pack at the higher position, and large temperature difference of the stacked battery packs after stacking.

[0016] 2. A thermal pad is installed on the top of the single-layer battery pack to further increase the heat dissipation effect of the lower single-layer battery pack and the cooling effect of the upper single-layer battery pack on the lower single-layer battery pack.

[0017] 3. The supporting beams are equipped with horizontally arranged connecting plates and vertically arranged auxiliary beams to increase the shear resistance of the box frame. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of a single-layer battery pack in an embodiment of this utility model.

[0021] Figure 3 This is an exploded view of a single-layer battery pack in an embodiment of this utility model.

[0022] Figure 4 This is a schematic diagram of the support beam in an embodiment of this utility model.

[0023] In the diagram: 10. Stacked battery pack; 11. Cover plate; 20. Single-layer battery pack; 30. Box frame; 301. Water inlet; 302. Water outlet; 31. Support beam; 32. Side plate; 321. Tank; 33. Connecting plate; 34. Support ridge; 341. Connecting hole; 35. Auxiliary beam; 36. Sealing ring; 41. First liquid cooling plate; 42. Second liquid cooling plate; 43. Thermal pad; 44. Positioning plate; 50. Battery module. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0025] Please see Figures 1 to 4A stacked battery pack includes several single-layer battery packs 20. Each single-layer battery pack 20 includes a housing frame 30, a first liquid cooling plate 41, a second liquid cooling plate 42, and several battery modules 50. The housing frame 30 includes four support beams 31 connected end-to-end. The first liquid cooling plate 41 is disposed at the bottom of the housing frame 30, and the battery modules 50 are disposed on the first liquid cooling plate 41. A second liquid cooling plate 42 is sandwiched between two adjacent battery modules 50. The several single-layer battery packs 20 are stacked, with the housing frame 30 of the upper single-layer battery pack 20 aligned with the housing frame 30 of the lower single-layer battery pack 20. When multiple single-layer battery packs 20 are stacked, the first liquid cooling plate 41 is located between the upper and lower single-layer battery packs 20, which can simultaneously cool and dissipate heat from both single-layer battery packs 20, avoiding the problem of poor heat dissipation in the stacked battery pack 10.

[0026] Please see Figure 3 and Figure 4 The housing frame 30 includes four support beams 31 connected end to end in sequence. Two support beams 31 are arranged opposite each other as side walls, and the other two support beams 31 are arranged opposite each other as end plates. A first liquid cooling plate 41 is laid inside the housing frame 30 and at the lower end of the support beams 31. The first liquid cooling plate 41 serves as the bottom plate of the housing frame 30 to support the battery module 50. Compared with the traditional housing, the thickness and height of the housing frame 30 are reduced.

[0027] The supporting beam 31 includes a side plate 32 and auxiliary beams 35 disposed on the side plate 32. The side plate 32 is a clamping frame with horizontally arranged connecting plates 33 inside to improve the structural strength of the side plate 32 and resist the external horizontal forces acting on the supporting beam 31. In this embodiment, multiple connecting plates 33 are arranged along the height direction of the side plate 32 to evenly distribute the structural strength of the side plate 32. Supporting ribs 34 are provided on the outward-facing end face of the side plate 32. Two supporting ribs 34 are respectively disposed at the upper and lower ends of the side plate 32. The auxiliary beams 35 are vertically disposed between the two supporting ribs 34, and their two ends are fixedly connected to the two supporting ribs 34 to improve the structural strength of the side plate 32 and resist the external vertical forces acting on the supporting beam 31. In this embodiment, multiple auxiliary beams 35 are arranged along the length direction of the side plate 32 to evenly distribute the structural strength of the side plate 32.

[0028] In actual production, the number of first liquid cooling plates 41 should be determined according to the size of the battery module 50 and the capacity of the single-layer battery pack 20, and multiple first liquid cooling plates 41 should be laid flat inside the housing frame 30. The support beam 31, which serves as the end plate, has an inlet 301 and an outlet 302. Multiple first liquid cooling plates 41 are connected in series or in parallel to the inlet 301 and the outlet 302. Preferably, multiple first liquid cooling plates 41 are connected in parallel to the inlet 301 to improve the cooling effect of the first liquid cooling plates 41. Coolant enters the first liquid cooling plate 41 through the inlet 301, circulates within the first liquid cooling plate 41 to cool the battery module 50 inside the housing frame 30, and then flows out through the outlet 302.

[0029] The battery module 50 includes several neatly arranged battery cells. Several battery modules 50 are housed within the housing frame 30. In actual production, the number of battery modules 50 should be determined based on the capacity of a single-layer battery pack 20. The battery modules 50 are laid flat on a first liquid cooling plate 41. A second liquid cooling plate 42 is positioned between adjacent battery modules 50. The second liquid cooling plate 42 is vertically positioned to cool the end faces of the two battery modules 50. Preferably, the height of the second liquid cooling plate 42 is the same as the height of the battery cells within the battery module 50. In this application, the second liquid cooling plate 42 is connected in parallel with the first liquid cooling plate 41 to the inlet 301 and the outlet 302.

[0030] The housing frame 30 is also provided with positioning plates 44. Two positioning plates 44 are spaced apart in the housing frame 30. The two ends of the positioning plates 44 are fixedly connected to the two side support beams 31 respectively. The battery module 50 is placed between the two positioning plates 44, and the two end faces of the battery module 50 abut against the two positioning plates 44 respectively. The positioning plates 44 are used to limit the displacement of the battery module 50 and fix the battery module 50 in the housing frame 30.

[0031] This application does not impose any restrictions on the structure of the first liquid cooling plate 41 and the second liquid cooling plate 42. Any liquid cooling plate that can be arranged in the housing frame 30 or between the two battery modules 50 can be used in this application. Therefore, the structure of the liquid cooling plate should not affect the technical solution of this application.

[0032] Several single-layer battery packs 20 are stacked and assembled into a stacked battery pack 10. The number of stacked single-layer battery packs 20 should be determined according to the capacity of the stacked battery pack 10 produced. When the single-layer battery packs 20 are stacked, the housing frames 30 of the two single-layer battery packs 20 are aligned. The first liquid cooling plate 41 located in the upper single-layer battery pack 20 is located above the lower single-layer battery pack 20. It can serve as the top cover of the lower single-layer battery pack 20 to reduce the height of the stacked battery pack and lower the center of the stacked battery pack 10. At the same time, it cools the bottom of the battery module 50 in the upper single-layer battery pack 20 and the top of the battery module 50 in the lower single-layer battery pack 20 simultaneously, improving the internal heat dissipation of the stacked battery pack 10, uniformizing the internal temperature of the stacked battery pack 10, and reducing the internal temperature difference of the stacked battery pack 10.

[0033] Furthermore, within the single-layer battery pack 20, a thermal pad 43 is also provided on the battery module 50, with the thermal pad 43 located on top of the battery cell. Within the stacked battery pack 10, the thermal pad 43 contacts the first liquid cooling plate 41 of the upper single-layer battery pack 20 to accelerate the heat dissipation of the upper first liquid cooling plate 41.

[0034] On the top single-layer battery pack 20, a cover plate 11 is also provided. The cover plate 11 is fixedly connected to the support beam 31 by bolts to seal the stacked battery pack 10.

[0035] The support beam 31 is provided with connection holes 341. Specifically, a number of connection holes 341 are provided on the upper and lower auxiliary beams 35. When the single-layer battery pack 20 is stacked, the two box frames 30 are aligned. The connection holes 341 on the upper auxiliary beam 35 correspond to the connection holes 341 on the lower auxiliary beam 35. Bolts are provided in the connection holes 341. The two adjacent single-layer battery packs 20 are fixedly connected by bolts.

[0036] Furthermore, on each single-layer battery panel, a groove 321 is provided on the top of the side panel 32, and four support beams 31 are connected end to end, with the grooves 321 connected to form an annular groove. A sealing ring 36 is provided inside the groove 321. When the single-layer battery packs 20 are stacked, the upper box frame 30 presses on the lower box frame 30, and the sealing ring 36 is pressed down by the weight of the single-layer battery pack 20, and fixed with bolts to form a seal.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A stacked battery pack, characterized in that, Includes several single-layer battery packs (20); The single-layer battery pack (20) includes a housing frame (30), a first liquid cooling plate (41), a second liquid cooling plate (42), and a battery module (50). The box frame (30) includes four support beams (31) connected end to end in sequence. The first liquid cooling plate (41) is disposed at the bottom of the housing frame (30), and a plurality of battery modules (50) are arranged on the first liquid cooling plate (41). A second liquid cooling plate (42) is disposed between two adjacent battery modules (50). In the single-layer battery pack (20), a thermal pad (43) is disposed on the battery module (50). Several single-layer battery packs (20) are stacked together, with the housing frame (30) of the upper single-layer battery pack (20) aligned with the housing frame (30) of the lower single-layer battery pack (20), and the first liquid cooling plate (41) of the upper single-layer battery pack (20) pressed onto the thermal pad (43) of the lower single-layer battery pack (20); a cover plate (11) is provided on the top single-layer battery pack (20).

2. The stacked battery pack according to claim 1, characterized in that, The battery module (50) includes several cells arranged in a row, and the thermal pad (43) is laid on top of the cells.

3. A stacked battery pack according to claim 2, characterized in that, The height of the second liquid cooling plate (42) is the same as the height of the battery cell.

4. A stacked battery pack according to claim 1, characterized in that, The housing frame (30) is provided with a positioning plate (44), and the two ends of the positioning plate (44) are fixedly connected to the support beam (31). The battery module (50) is disposed between the two positioning plates (44).

5. A stacked battery pack according to claim 1, characterized in that, The supporting beam (31) includes a side plate (32) and an auxiliary beam (35) disposed on the side plate (32). The side plate (32) is a sandwich structure, and a horizontally arranged connecting plate (33) is disposed inside it. Several connecting plates (33) are spaced apart along the height direction of the side plate (32).

6. A stacked battery pack according to claim 5, characterized in that, The side plate (32) is provided with support ribs (34) at the top and bottom respectively. The two support ribs (34) are located on the same end face of the side plate (32). The auxiliary beams (35) are vertically arranged between the two support ribs (34). A number of auxiliary beams (35) are spaced apart along the length direction of the side plate (32).

7. A stacked battery pack according to claim 6, characterized in that, The support rib (34) is provided with a plurality of connecting holes (341), and bolts are provided in the connecting holes (341) to connect the box frame (30) of the two adjacent single-layer battery packs (20) above and below.

8. A stacked battery pack according to claim 1, characterized in that, In each of the single-layer battery packs (20), a sealing ring (36) is provided on the housing frame (30), and the sealing ring (36) is provided on the top of the support beam (31); the sealing ring (36) is pressed between the two adjacent housing frames (30).

9. A stacked battery pack according to claim 8, characterized in that, The top of the support beam (31) is provided with a groove (321) for accommodating the sealing ring (36).

10. A stacked battery pack according to claim 1, characterized in that, The support beam (31) is provided with an inlet (301) and an outlet (302), and the first liquid cooling plate (41) and the second liquid cooling plate (42) are connected in parallel to the inlet (301) and the outlet (302).

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