Battery pack

Abstract

Provided in the present application is a battery pack, comprising: a battery case, wherein a first opening is provided on one side of the battery case, and a second opening is provided on the side of the battery case opposite the first opening; a battery module, which is assembled in the battery case; a first liquid cooling plate, which is assembled at the first opening of the battery case; a second liquid cooling plate, which is assembled at the second opening of the battery case; and a CCS assembly, which is arranged between the battery module and the first liquid cooling plate.

Description

Battery pack

[0001] The present application claims priority to the Chinese patent application No. 202421963412.0, filed on August 13, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery pack. BACKGROUND

[0003] With the rapid development of electric vehicles and energy storage technology, the charging and discharging power of battery packs is increasing to meet the growing energy demand. However, high power charging and discharging brings the problem that the heat generated inside the battery pack cannot be effectively released, resulting in a significant rise in the temperature of the battery cells, which not only affects the performance of the battery pack, but also seriously shortens its service life.

[0004] The related art battery pack heat dissipation solution is usually to set a liquid cooling plate on the top or bottom of the battery pack, and to take away the heat generated by the battery through the flow of the cooling liquid in the liquid cooling plate. TECHNICAL PROBLEM

[0005] The liquid cooling plate in the related art is usually only set on the top or bottom of the battery pack, which cannot cover the battery pack more comprehensively, resulting in uneven heat distribution and poor heat dissipation effect; and the cover body set outside the liquid cooling plate improves the support strength and protection of the battery pack, but at the same time increases the thermal resistance and reduces the heat exchange efficiency, which cannot meet the heat dissipation demand. TECHNICAL SOLUTION

[0006] The present application provides a battery pack, comprising: a battery box, the battery box being provided with a first opening on one side, and the side of the battery box opposite to the first opening being provided with a second opening; a battery module, the battery module being assembled in the battery box; a first liquid cooling plate, the first liquid cooling plate being assembled at the first opening of the battery box; a second liquid cooling plate, the second liquid cooling plate being assembled at the second opening of the battery box; and a CCS assembly, the CCS assembly being arranged between the battery module and the first liquid cooling plate. ADVANTAGEOUS EFFECTS

[0007] The battery pack provided by the application has the beneficial effects that: by arranging the first opening and the second opening on the two sides of the battery box body respectively, and respectively assembling the first liquid cooling plate and the second liquid cooling plate, the overall coverage of the battery module is realized. This design ensures that the heat generated by the battery module can be uniformly and effectively absorbed and taken away by the liquid cooling plate, thereby avoiding the phenomenon of uneven heat distribution and improving the overall heat dissipation effect. The cover body design outside the liquid cooling plate is cancelled, the liquid cooling plate is directly contacted with the external environment, the thermal resistance is reduced, the heat can be more quickly transferred to the cooling liquid, and the heat exchange efficiency is improved. This design can ensure that the heat generated by the battery module during high-power charging and discharging can be taken away in time, and keep the battery module in a suitable working temperature range. BRIEF DESCRIPTION OF DRAWINGS

[0008] FIG. 1 is a schematic diagram of the battery pack provided by the application;

[0009] FIG. 2 is a schematic diagram of the battery pack provided by the application;

[0010] FIG. 3 is a schematic diagram of the first liquid cooling plate provided by the application;

[0011] FIG. 4 is a schematic diagram of the first liquid cooling plate provided by the application;

[0012] FIG. 5 is a schematic diagram of the first liquid cooling plate provided by the application;

[0013] FIG. 6 is a schematic diagram of the first liquid cooling plate provided by the application;

[0014] FIG. 7 is a schematic diagram of the CCS assembly provided by the application;

[0015] FIG. 8 is a schematic diagram of the side surface of the battery box provided by the application.

[0016] Wherein, the reference signs have the following meanings: 1, battery box; 11, first opening; 12, second opening; 2, battery module; 3, first liquid cooling plate; 31, first flow channel plate; 311, mounting table; 32, first plane plate; 321, mounting hole; 33, first liquid cooling flow channel; 331, first inflow channel; 332, first convergence channel; 333, first outflow channel; 34, reinforcing rib; 35, first liquid cooling inlet; 36, first liquid cooling outlet; 4, second liquid cooling plate; 41, second flow channel plate; 411, bearing groove; 42, second plane plate; 43, second liquid cooling flow channel; 44, flow dividing rib; 45, flow disturbing rib; 46, flow disturbing bump; 47, second liquid cooling inlet; 48, second liquid cooling outlet; 5, CCS assembly; 51, plastic support; 511, assembly groove; 52, connecting sheet; 53, collection wire harness; 6, first heat conduction structure; 61, heat conduction pad; 7, second heat conduction structure; 71, heat conduction strip; 8, electrical element; 81, fire-fighting nozzle; 82, communication interface; 83, explosion-proof valve; 84, positive high-voltage connection socket; 85, negative high-voltage connection socket; 86, battery management unit; 87, fuse; 9, maintenance window. Embodiment of the application

[0017] Embodiment 1 of the present application is shown in FIGS. 1-8, which provides a battery pack, comprising a battery box 1, a battery module 2, a first liquid cooling plate 3, a second liquid cooling plate 4 and a CCS assembly 5. Wherein, the battery box 1 is provided with a first opening 11 on one side, and the side of the battery box 1 opposite to the first opening 11 is provided with a second opening 12. In actual use, the first opening 11 is located at the top of the battery pack, and the second opening 12 is located at the bottom of the battery pack. The battery module 2 is assembled in the battery box 1, and the fixing mode includes but is not limited to foaming glue fixing. The battery module 2 is stacked by a plurality of battery cells, and is provided with a steel belt. The first liquid cooling plate 3 is assembled at the first opening 11 of the battery box 1, the second liquid cooling plate 4 is assembled at the second opening 12 of the battery box 1, and the CCS assembly 5 is arranged between the battery module 2 and the first liquid cooling plate 3. The CCS assembly 5 comprises a plastic support 51, a connecting sheet 52 and a collection wire harness 53. The plastic support 51 is provided with a plurality of assembly grooves 511, at least one connecting sheet 52 is assembled in each assembly groove 511, and the collection wire harness 53 is connected with each connecting sheet 52. Wherein, the thickness of the connecting sheet 52 is not higher than the depth of the assembly groove 511, realizing reliable connection and signal transmission between the battery modules. By arranging the first opening 11 and the second opening 12 on the opposite sides of the battery box 1, the first liquid cooling plate 3 and the second liquid cooling plate 4 are assembled respectively, realizing full coverage of the battery module 2, which helps to improve the phenomenon of uneven heat distribution and improve the heat dissipation effect. At the same time, the cover design outside the liquid cooling plate is cancelled, the thermal resistance is reduced, and the heat exchange efficiency is improved.

[0018] Referring to FIGS. 2-5, the first liquid cooling plate 3 at the top of the battery module 2 includes a first flow channel plate 31 and a first flat plate 32, the first flat plate 32 is buckled to the first flow channel plate 31, the first flow channel plate 31 is closer to the battery module 2 than the first flat plate 32, a first liquid cooling flow channel 33 is formed between the first flow channel plate 31 and the first flat plate 32, and the first liquid cooling flow channel 33 is provided with a first liquid cooling inlet 35 and a first liquid cooling outlet 36. The first flow channel plate 31 is provided with a mounting table 311 recessed into the first liquid cooling flow channel 33, the first flat plate 32 is provided with a mounting hole 321 corresponding to the mounting table 311, and the mounting table 311 is fitted into the mounting hole 321. The first liquid cooling flow channel 33 is arranged away from the mounting hole 321 and the mounting table 311, and the first liquid cooling flow channel 33 can be U-shaped or S-shaped. In this embodiment, the first liquid cooling flow channel 33 is U-shaped, including a first inflow passage 331, a first converging passage 332 and a first outflow passage 333, the first liquid cooling inlet 35 communicates with the first inflow passage 331, the first outflow passage 333 communicates with the first liquid cooling outlet 36, and the first inflow passage 331 and the first outflow passage 333 are each provided with a plurality of passages separated by the mounting table 311. In one embodiment, the first inflow passage 331 is provided with two passages, and the first outflow passage 333 is provided with three passages. The plurality of first inflow passages 331 and the plurality of first outflow passages 333 are communicated through the first converging passage 332, the cooling liquid enters from the first liquid cooling inlet 35, flows through the first liquid cooling flow channel 33, and flows out from the first liquid cooling outlet 36 after absorbing the heat of the battery module 2, forming a complete heat dissipation cycle.

[0019] The second liquid cooling plate 4 at the bottom of the battery module 2 includes a second flow channel plate 41 and a second flat plate 42, the second flat plate 42 is buckled to the second flow channel plate 41, the second flow channel plate 41 is closer to the battery module 2 than the second flat plate 42, a second liquid cooling flow channel 43 is formed between the second flow channel plate 41 and the second flat plate 42, and the second liquid cooling flow channel 43 is provided with a second liquid cooling inlet 47 and a second liquid cooling outlet 48. The second liquid cooling flow channel 43 can be U-shaped or S-shaped, and in this embodiment, the second liquid cooling flow channel 43 is S-shaped. In order to make the cooling liquid flow more uniformly in the second liquid cooling flow channel 43, a flow dividing rib 44 is arranged in the second liquid cooling flow channel 43 along the length direction of the second flow channel plate 41, the flow dividing rib 44 is integrally arranged on the second flow channel plate 41 or the second flat plate 42 and abuts against the other, which can make the cooling liquid more uniformly distributed in the flow channel, reduce the flow dead zone and improve the heat dissipation performance. The second liquid cooling flow channel 43 along the length direction of the second flow channel plate 41 is divided into a plurality of passages, for example, 3 passages, the cooling liquid enters from the second liquid cooling inlet 47, flows through the second liquid cooling flow channel 43, and flows out from the second liquid cooling outlet 48 after absorbing the heat of the battery module 2, forming a complete heat dissipation cycle.

[0020] In other embodiments, the first liquid cooling plate 3 and the second liquid cooling plate 4 can be interchangeable in the position of the battery box 1, and the heat dissipation of the top and bottom of the battery module 2 can be achieved.

[0021] In some embodiments, referring to FIG. 3, the first liquid cooling plate 3 is arranged on the top of the battery box 1. In order to improve the bearing capacity of the top of the battery box 1, the first planar plate 32 is provided with a reinforcing rib 34 recessed towards the first liquid cooling channel 33. Alternatively, the first planar plate 32 is provided with a reinforcing rib 34 protruding away from the first liquid cooling channel 33. Alternatively, the first planar plate 32 is provided with a reinforcing rib 34 recessed towards the first liquid cooling channel 33 and a reinforcing rib 34 protruding away from the first liquid cooling channel 33. In this embodiment, only the first planar plate 32 is provided with a reinforcing rib 34 recessed towards the first liquid cooling channel 33. This design can improve the rigidity of the local area of the first planar plate 32 without increasing the overall thickness of the first planar plate 32. The recessed reinforcing rib 34 can effectively resist pressure fluctuations caused by the flow of cooling liquid, thereby ensuring the stability and sealing of the first liquid cooling channel 33. In addition, this design also helps to reduce the turbulence of the cooling liquid in the channel and improve the heat dissipation efficiency. In other embodiments, if the reinforcing rib 34 is protruding away from the first liquid cooling channel 33, this design can enhance the overall strength and rigidity of the first planar plate 32. The protruding reinforcing rib 34 can increase the surface area of the first planar plate 32, making it more resistant to external pressure and impact. This design is of great significance to improve the durability and safety of the battery pack in harsh working environments. In some embodiments, the reinforcing rib 34 can also exist in both states, which is not limited in this embodiment.

[0022] In some embodiments, referring to FIGS. 5-6, the second liquid cooling plate 4 is arranged on the bottom of the battery box 1. In order to improve the heat dissipation effect of the bottom of the battery box 1, the second liquid cooling channel 43 is provided with a turbulence rib 45 arranged towards the flow dividing rib 44. Alternatively, the flow dividing rib 44 is provided with a turbulence protrusion 46. Alternatively, the second liquid cooling channel 43 is provided with a turbulence protrusion 46 and a turbulence rib 45. In this embodiment, both the turbulence rib 45 and the turbulence protrusion 46 exist, which can improve the flow state of the cooling liquid in the channel, increase the turbulence effect, and improve the heat dissipation performance. In other embodiments, the turbulence protrusion 46 and the turbulence rib 45 can also be arranged in the first liquid cooling plate 3, which can achieve the turbulence effect.

[0023] The shape of the turbulence rib 45 and the turbulence protrusion 46 is not limited, which can be strip-shaped, semi-circular, spherical or other shapes, which can achieve the turbulence effect.

[0024] In order to improve the heat dissipation effect of the battery pack, as shown in FIG. 2, a first heat conduction structure 6 is arranged between the first liquid cooling plate 3 and the CCS assembly 5. Alternatively, a second heat conduction structure 7 is arranged between the second liquid cooling plate 4 and the battery module 2. Alternatively, the first heat conduction structure 6 is arranged between the first liquid cooling plate 3 and the CCS assembly 5, and at the same time, the second heat conduction structure 7 is arranged between the second liquid cooling plate 4 and the battery module 2. In this embodiment, the heat conduction path is optimized and the thermal resistance is reduced through the first heat conduction structure 6 and the second heat conduction structure 7, so as to ensure that the heat generated by the battery module 2 can be quickly and effectively transferred to the liquid cooling plate and then taken away by the cooling liquid. This not only helps to keep the battery module 2 running in an appropriate temperature range, improves the performance and service life of the battery, but also ensures the safe and stable operation of the battery pack.

[0025] In this embodiment, both the first heat conduction structure 6 and the second heat conduction structure 7 exist. The first heat conduction structure 6 includes a plurality of heat conduction pads 61, the heat conduction pads 61 are arranged corresponding to the assembly grooves 511, one side of the heat conduction pads 61 is in contact with the connecting pieces 52 in the assembly grooves 511, and the other side is in contact with the first liquid cooling plate 3, so as to ensure that the heat generated by each connecting piece 52 can be effectively transferred to the first liquid cooling plate 3 through the heat conduction pad 61. In one embodiment, the area of the heat conduction pad 61 is equivalent to the area of the assembly groove 511. The side of the second liquid cooling plate 4 facing the battery module 2 is provided with an inner concave supporting groove 411, i.e. the supporting groove 411 is arranged on the second flow channel plate 41, and the battery module 2 is assembled in the supporting groove 411. This contact not only ensures the stability of the battery module 2, but also improves the efficiency of heat conduction.

[0026] In one embodiment, the second heat conduction structure 7 includes a plurality of heat conduction strips 71, the heat conduction strips 71 are located in the supporting groove 411 and are arranged at intervals along the length direction of the second liquid cooling plate 4, and the heat conduction strips 71 respectively abut against the battery module 2 and the second flow channel plate 41 of the second liquid cooling plate 4, so as to ensure the uniform distribution and effective transfer of heat on the battery module 2, the efficient heat conduction from the battery module 2 to the second liquid cooling plate 4, and the improvement of the heat dissipation effect. In one embodiment, the thickness of the heat conduction strip 71 is less than the depth of the supporting groove 411, so as to ensure that the heat conduction strip 71 can be completely embedded in the supporting groove 411 and tightly fit with the battery module 2 and the second liquid cooling plate 4, reduce the thermal resistance, and improve the heat conduction efficiency. In one embodiment, the first heat conduction structure 6 and the second heat conduction structure 7 are both heat conduction glue.

[0027] In other embodiments, the first heat conduction structure 6 and the second heat conduction structure 7 can exist separately, and the specific structure is not specifically limited as long as it can achieve good heat conduction.

[0028] In some embodiments, referring to FIG. 1 and FIG. 8, in order to improve the maintainability of the battery pack, a maintenance window 9 is arranged on the battery shell. The battery shell has electrical components 8, including fire sprinkler 81, communication interface 82, explosion-proof valve 83, positive high-voltage connection socket 84, negative high-voltage connection socket 85, battery management unit 86 and fuse 87. The battery management unit 86 and the fuse 87 are covered by the maintenance window 9 and can be removed and repaired or replaced when the battery pack needs to be repaired.

[0029] The battery pack provided by the present application has the following technical effects:

[0030] 1. By arranging the first opening 11 and the second opening 12 on the two sides of the battery box 1 respectively, and respectively assembling the first liquid cooling plate 3 and the second liquid cooling plate 4, the overall coverage of the battery module 2 is realized. This design ensures that the heat generated by the battery module 2 can be uniformly and effectively absorbed and carried away by the liquid cooling plate, thereby avoiding the phenomenon of uneven heat distribution and improving the overall heat dissipation effect;

[0031] 2. The cover design outside the liquid cooling plate is cancelled, and the liquid cooling plate is directly in contact with the external environment, reducing the thermal resistance and enabling the heat to be transferred to the cooling liquid more quickly, thereby improving the heat exchange efficiency. This design can ensure that the heat generated by the battery module 2 during high-power charging and discharging can be carried away in time, keeping the battery module 2 within the appropriate working temperature range.

Claims

1. A battery pack, comprising: a battery box (1) provided with a first opening (11) on one side, and a second opening (12) on the side opposite to the first opening (11); a battery module (2) assembled in the battery box (1); a first liquid cooling plate (3) assembled at the first opening (11) of the battery box (1); a second liquid cooling plate (4) assembled at the second opening (12) of the battery box (1); a CCS assembly (5) arranged between the battery module (2) and the first liquid cooling plate (3).

2. The battery pack of claim 1, wherein, The first liquid cooling plate (3) comprises: a first flow channel plate (31); a first flat plate (32) buckled to the first flow channel plate (31), and a first liquid cooling flow channel (33) formed between the first flow channel plate (31) and the first flat plate (32), and provided with a first liquid cooling inlet (35) and a first liquid cooling outlet (36).

3. The battery pack of claim 2, wherein, The first flow channel plate (31) is provided with a mounting table (311) recessed into the first liquid cooling flow channel (33), and the first flat plate (32) is provided with a mounting hole (321) corresponding to the mounting table (311), and the mounting table (311) is assembled in the mounting hole (321).

4. The battery pack of claim 2, wherein, The first flat plate (32) is provided with a reinforcing rib (34) recessed towards the first liquid cooling flow channel (33), or provided with a reinforcing rib (34) protruding away from the first liquid cooling flow channel (33), or provided with a reinforcing rib (34) recessed towards the first liquid cooling flow channel (33) and a reinforcing rib (34) protruding away from the first liquid cooling flow channel (33).

5. The battery pack of claim 1, wherein, The second liquid cooling plate (4) comprises: a second flow channel plate (41); a second flat plate (42) buckled to the second flow channel plate (41), and a second liquid cooling flow channel (43) formed between the second flow channel plate (41) and the second flat plate (42), and provided with a second liquid cooling inlet (47) and a second liquid cooling outlet (48).

6. The battery pack of claim 5, wherein, The second liquid cooling flow channel (43) is provided with a flow dividing rib (44) arranged along the length direction of the second flow channel plate (41).

7. The battery pack of claim 6, wherein, The second liquid cooling flow channel (43) is provided with a flow disturbing rib (45) arranged towards the flow dividing rib (44), or the flow dividing rib (44) is provided with a flow disturbing protrusion (46), or the second liquid cooling flow channel (43) is provided with a flow disturbing rib (45) arranged towards the flow dividing rib (44), and the flow dividing rib (44) is provided with a flow disturbing protrusion (46).

8. The battery pack of any one of claims 1-7, wherein, The first liquid cooling plate (3) and the CCS assembly (5) are provided with a first heat conduction structure (6); or, the second liquid cooling plate (4) and the battery module (2) are provided with a second heat conduction structure (7); or, the first liquid cooling plate (3) and the CCS assembly (5) are provided with a first heat conduction structure (6), and the second liquid cooling plate (4) and the battery module (2) are provided with a second heat conduction structure (7).

9. The battery pack of claim 8, wherein, The CCS assembly (5) comprises: A plastic support (51) provided with a plurality of assembly grooves (511); A connecting sheet (52) is assembled in each assembly groove (511); A collection wire harness (53) connected with each connecting sheet (52); The thickness of the connecting sheet (52) is not higher than the depth of the assembly groove (511).

10. The battery pack of claim 9, wherein, The first heat conduction structure (6) comprises a plurality of heat conduction pads (61), which are arranged corresponding to the assembly grooves (511), one side of the heat conduction pad (61) is in contact with the connecting sheet (52) in the assembly groove (511), and the other side is in contact with the first liquid cooling plate (3).

11. The battery pack of claim 8, wherein, The second liquid cooling plate (4) is provided with an inner concave supporting groove (411) on the side facing the battery module (2), and the battery module (2) is assembled in the supporting groove (411).

12. The battery pack of claim 11, wherein, The second heat conduction structure (7) comprises a plurality of heat conduction strips (71), which are arranged along the length direction of the second liquid cooling plate (4).

13. The battery pack of claim 12, wherein, The thickness of the heat conduction strip (71) is less than the depth of the supporting groove (411).

14. The battery pack of any one of claims 1-7, wherein, The battery module (2) is provided with a maintenance window (9).

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