Battery pack

Abstract

The utility model provides a battery pack which comprises a bottom plate, an edge beam and a liquid cooling assembly, the edge beam is arranged on the bottom plate in an extending mode in the Y direction and connected with the bottom plate, the liquid cooling assembly comprises a liquid cooling plate and a connecting piece, and the liquid cooling plate is detachably connected with the edge beam through the connecting piece. Compared with the prior art, the battery pack assembly is easy to operate, the excellent assembly effect can be achieved under the condition of a plurality of liquid cooling plates, and the overall structural stability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack. Background Art

[0002] The current battery pack uses liquid cooling plates to achieve the dual functions of cooling and fixing the battery cells. However, some liquid cooling plates are not firmly connected to the box, and the overall modality of the battery pack is low. In the current situation where battery packs are getting larger and larger and the number of liquid cooling plates is large, if there is no restriction on the assembly of liquid cooling plates, the entire assembly operation will be too cumbersome and chaotic, and in many environments, the battery pack’s requirements for heat or force cannot be met. It should be noted that the energy density of the battery is an important parameter in the battery’s performance. However, when improving the battery’s energy density, other performance parameters of the battery also need to be considered. Therefore, how to improve the assembly of the liquid cooling plate and the side beam to improve the battery’s performance is a technical problem that needs to be solved in battery technology. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a battery pack, which simplifies the assembly process of the liquid cooling plate and the side beam, and can also achieve a better assembly effect for multiple liquid cooling plates.

[0004] Based on this, the utility model provides a battery pack, which includes:

[0005] Base plate;

[0006] A side beam extending along the Y direction and arranged on the bottom plate and connected to the bottom plate;

[0007] A liquid cooling assembly, the liquid cooling assembly comprising a liquid cooling plate and a connecting piece, the liquid cooling plate being detachably connected to the side beam through the connecting piece, the liquid cooling plate extending along the X direction and having the connecting piece disposed at at least one end, and a plurality of the liquid cooling plates being spaced apart along the Y direction;

[0008] The battery cell is arranged between adjacent liquid cooling plates. The battery cell has a first wall and a second wall connected to each other. The first wall is the wall with the largest surface area of ​​the battery cell. The first wall is thermally connected to the liquid cooling plate, and the second wall is spaced apart from the side beam.

[0009] In some embodiments of the present application, the liquid cooling assembly extends along the X direction and is connected to the base plate.

[0010] In some embodiments of the present application, the side beam is provided with an assembly groove, and the connecting member is provided with an outer protrusion, and the outer protrusion is inserted into the assembly groove.

[0011] In some embodiments of the present application, reinforcing ribs are provided on the outer protrusion.

[0012] In some embodiments of the present application, the assembly groove is filled with an adhesive to fix the side beam and the connecting member.

[0013] In some embodiments of the present application, the outer convex portion is provided with a guide hole for the adhesive to flow, and the guide hole penetrates the outer convex portion along the thickness direction of the outer convex portion.

[0014] In some embodiments of the present application, the battery pack also has a Z direction, the connecting member has a main body, the outer protrusion is connected to the main body and a limiting groove is formed therebetween, the limiting groove is openly arranged at one end close to the assembly groove along the Z direction, the outer protrusion is inserted into the assembly groove along the Z direction, and the groove wall of the limiting groove is limitedly matched with the groove wall of the assembly groove; wherein, the X direction, the Y direction and the Z direction intersect each other.

[0015] In some embodiments of the present application, the liquid cooling plate includes a first bending portion and a second bending portion, and a plurality of the first bending portion and a plurality of the second bending portion are provided, and the first bending portion and the second bending portion are alternately arranged in sequence along the X direction.

[0016] In some embodiments of the present application, a flow channel is formed in the liquid cooling plate, a heat conduction cavity connected to the flow channel is formed in the connecting piece, and the flow channel and the heat conduction cavity are filled with a cooling medium.

[0017] In some embodiments of the present application, the liquid cooling assembly also includes a liquid cooling pipe, a through hole is opened on the main body, the liquid cooling pipe is passed through the through hole and is connected to the connecting piece, and the liquid cooling pipe is used to transmit the cooling medium to the heat conduction cavity.

[0018] In some embodiments of the present application, a guard plate is further included, which is arranged on the bottom plate and connected to the side beam. The guard plate includes a first sub-plate and a second sub-plate, and the side beam includes a first sub-beam and a second sub-beam. The two ends of the first sub-plate are connected to the first ends of the first sub-beam and the second sub-beam, and the two ends of the second sub-plate are respectively connected to the second ends of the first sub-beam and the second sub-beam.

[0019] Compared with the prior art, the battery pack provided by the present utility model has the following advantages:

[0020] The utility model provides a battery pack, which includes a bottom plate, a side beam and a liquid cooling assembly. The side beam extends along the Y direction and is arranged on the bottom plate and connected to the bottom plate. The liquid cooling assembly includes a liquid cooling plate and a connector. The liquid cooling plate is detachably connected to the side beam through the connector. Based on the above structure, the present application uses a connector to connect the side beam and the liquid cooling plate. The provision of the connector ensures an effective connection between the liquid cooling plate and the side beam, and a relatively good assembly effect can be obtained for the case of multiple liquid cooling plates; and the liquid cooling plate is detachably connected to the side beam through the connector. When a problem occurs with the side beam or the liquid cooling plate, the problematic part can be removed in time by disassembling the connector, thereby improving maintenance efficiency; in addition, the connector can also cooperate with the liquid cooling plate to transfer the heat absorbed by the liquid cooling plate to the side beam, thereby meeting the battery pack's requirements for the heating level. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a battery pack according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the assembly of the liquid cooling assembly and the box body of an embodiment of the utility model;

[0023] Figure 3 This is a structural exploded diagram of the box body of the utility model embodiment;

[0024] Figure 4 This is a schematic structural diagram of a first side beam and a second side beam in an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the liquid cooling plate of an embodiment of the utility model;

[0026] Figure 6 This is a schematic structural diagram of a first connecting member according to an embodiment of the utility model;

[0027] Figure 7 This is a schematic structural diagram of a second connecting member according to an embodiment of the utility model;

[0028] Figure 8 A schematic diagram of the structure of a battery cell according to an embodiment of the utility model;

[0029] Fig. 9 A front cross-sectional view of a battery pack according to an embodiment of the present utility model;

[0030] Fig.10 for Fig. 9 Detailed drawing of point A in FIG.

[0031] Fig.11 for Fig. 9 Detail of point B in the figure.

[0032] In the figure: 1. bottom plate; 2. side beam; 21. assembly groove; 22. first sub-beam; 23. second sub-beam; 3. guard plate; 31. first sub-plate; 32. second sub-plate; 4. liquid cooling assembly; 41. liquid cooling plate; 42. connecting piece; 421. outer protrusion; 4211. reinforcing rib; 4212. guide hole; 422. main body; 423. limit groove; 424. heat conduction cavity; 425. through hole; 43. liquid cooling pipe; 5. battery cell; 51. first wall; 52. second wall; 6. mounting groove. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] It should be understood that the terms "front", "rear", etc. are used in the present invention to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, "front" information can also be referred to as "rear" information without departing from the scope of the present invention, and "rear" information can also be referred to as "front" information. In the embodiment of the present invention, the side of the vacuum packaging bag facing the operator is defined as the front side.

[0035] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0036] Further, such as Figure 1 As shown, the battery pack defined in the present application has an intersecting X direction and Y direction.

[0037] like Figures 1 to 11 As shown, the utility model provides a battery pack, which includes a base plate 1, a side beam 2 and a liquid cooling assembly 4, the side beam 2 extends along the Y direction and is arranged on the base plate 1 and connected to the base plate 1, the liquid cooling assembly 4 includes a liquid cooling plate 41 and a connecting member 42, and the liquid cooling plate 41 is connected to the side beam 2 through the connecting member 42.

[0038] Based on the above structure, the present application utilizes a connector 42 to connect the side beam 2 and the liquid cooling plate 41. The provision of the connector 42 ensures an effective connection between the liquid cooling plate 41 and the side beam 2, and a relatively reliable assembly effect can also be obtained for the case of multiple liquid cooling plates 41; and the liquid cooling plate 41 is detachably connected to the side beam 2 via the connector 42. When a problem occurs to the side beam 2 or the liquid cooling plate 41, the problem part can be removed in time by disassembling the matching relationship between the connector 42 and the side beam 2, thereby improving maintenance efficiency; in addition, the connector 42 can also cooperate with the liquid cooling plate 41 to transfer the heat absorbed by the liquid cooling plate 41 to the side beam 2, thereby meeting the battery pack's requirements for the heating level.

[0039] In fact, for the battery pack of the present application, it includes a plurality of battery cells 5. At this time, in order to achieve stable assembly of the plurality of battery cells 5, the liquid cooling assembly 4 is also provided with a plurality of corresponding ones. Specifically, the plurality of liquid cooling assemblies 4 are arranged at intervals along the Y direction, and a mounting groove 6 is formed between two adjacent liquid cooling assemblies 4, and at least one battery cell 5 is arranged in each mounting groove 6. Further, the liquid cooling assembly 4 includes a plurality of liquid cooling plates 41 and a plurality of connectors 42. The connector 42 is connected to at least one end of the length extension direction of the liquid cooling plate 41 (which may be the X direction). The liquid cooling plate 41 is detachably connected to the side beam 2 through the connector 42. The plurality of liquid cooling plates 41 are arranged at intervals along the Y direction. In some more specific embodiments, the connectors 42 are connected to both ends of the length extension direction of the liquid cooling plate 41.

[0040] In this embodiment, the liquid cooling plate 41 is connected to the bottom plate 1 to further improve the structural stability of the liquid cooling assembly 4, thereby improving the overall mode of the battery pack. In some specific embodiments, the liquid cooling plate 41 is bonded to the bottom plate 1, or the liquid cooling plate 41 abuts against the bottom plate 1.

[0041] In this embodiment, a plurality of battery cells 5 are disposed in the mounting groove 6, and the plurality of battery cells 5 are arranged along the X direction. Figure 8As shown, for the battery cell 5 of the present application, it has a first wall 51 and a second wall 52 connected to each other. The first wall 51 is the wall with the largest surface area of ​​the battery cell 5. The first wall 51 is thermally connected to the liquid cooling plate 41, and the second wall 52 is spaced from the side beam 2. In this way, the heat exchange area between the battery cell 5 and the liquid cooling plate 41 can be increased, and the cooling efficiency of the battery pack can be improved. In addition, the spacing between the second wall 52 and the side beam 2 can form a buffer space for the side beam 2, so that the side beam 2 bears more collision impact force, and improves the collision performance and safety of the battery pack. It can be understood that for the multiple battery cells 5 in this embodiment, at least the battery cell 5 closest to the side beam 2 along the X direction is spaced from the side beam 2, so that it can be known that all the battery cells 5 and the side beam 2 are spaced; in other embodiments, a battery cell 5 is arranged between the mounting grooves 6, and at this time, both ends of the battery cell 5 along the X direction are spaced from the side beam 2, and it can also be known that all the battery cells 5 and the side beam 2 are spaced, thereby improving the side collision performance of the battery pack.

[0042] Optional, such as Figure 6 and Figure 7 As shown, in one embodiment of the present application, the connector 42 has an outer protrusion 421, and the corresponding side beam 2 is provided with an assembly groove 21. During assembly, the outer protrusion 421 of the connector 42 is inserted into the assembly groove 21 to achieve effective connection between the side beam 2 and the liquid cooling plate 41. Through the arrangement of the outer protrusion 421 and the assembly groove 21, fast plug-in matching can be achieved, thereby improving the installation efficiency of the battery pack and reducing the manufacturing cost.

[0043] Furthermore, the connector 4 of the present application also has a main body 422 connected to the outer protrusion 421, and a limiting groove 423 is formed between the outer protrusion 421 and the main body 422. The limiting groove 423 is openly arranged near one end of the assembly groove 21 along the Z direction. When the outer protrusion 421 is inserted into the assembly groove 21, the groove wall of the limiting groove 423 is limitedly matched with the groove wall of the assembly groove 21, and the groove wall of one side of the assembly groove 21 enters the limiting groove 423 along the opening. When assembled in this way, the side beam 2 is fixed, and then the outer protrusion 421 is inserted into the assembly groove 21 to achieve an effective connection between the connector 42 and the side beam 2. Of course, the length of the outer protrusion 421 can also be further extended. At this time, the outer protrusion 421 is partially inserted into the assembly groove 21, and other connection structures can be arranged on the outer protrusion 421 outside the assembly groove 21 to strengthen the connection effect between the connector 4 and the side beam 2. In this embodiment, the connection between the connector 4 and the frame 2 is realized by the cooperation between the limiting groove and the assembly groove 21 , which is efficient and quick, can greatly improve the assembly efficiency and reduce the manufacturing cost.

[0044] Furthermore, the outer protrusion 421 of the connector 42 of the present application is also provided with a reinforcing rib 4211. The reinforcing rib 4211 can improve the structural strength of the outer protrusion 421, thereby improving the service life of the outer protrusion 421. Of course, it can be found that the reinforcing rib 4211 can also increase the contact area between the outer protrusion 421 and the outside world to a certain extent, thereby improving the heat conduction effect to achieve effective heat transfer. It should be noted that the reinforcing rib of the present application has a variety of structural forms, which can be square as in the present application, or can be set to a cylindrical or other irregular shape.

[0045] In some embodiments, there are multiple reinforcing ribs 4211, and multiple reinforcing ribs 4211 are spaced apart on both sides of the outer protrusion 421 in the thickness direction to further improve the structural strength of the outer protrusion.

[0046] In order to further improve the assembly stability of the side beam 2 and the connecting member 42, in one embodiment of the present application, the assembly groove 21 is also filled with an adhesive such as glue, that is, in addition to the outer protrusion 421, the assembly groove 21 is also filled with an adhesive that contacts the assembly groove 21 and the outer protrusion 421, so that the adhesive can simultaneously bond the side beam 2 and the connecting member 42 to improve the connection strength between the two. Correspondingly, in order to ensure that the adhesive can quickly fill the assembly groove 21, the outer protrusion 421 of the connecting member 42 is provided with a guide hole 4212 for the adhesive to flow, so that the glue on one side of the outer protrusion 421 can overflow to the other side, and the glue can also be filled in the guide hole 4212, so that the adhesive on both sides of the outer protrusion 421 can form a whole. Obviously, when the adhesive fills the assembly groove 21, the guide hole 4221 is also filled with the adhesive, thereby improving the connection strength between the outer protrusion 421 and the side beam 2. It should be noted that in the prior art, the liquid cooling plate 41 and the side beam 2 are mostly directly locked and fixedly connected by a rigid structure. This design often causes the external force to be transmitted to the battery cell without being relieved. Unlike the prior art, the present application uses an adhesive to achieve a buffering effect on the force transmission path. This design can also alleviate the force transmission path inside the entire battery pack when the battery pack is subjected to external force, and play a buffering role to a certain extent.

[0047] Optionally, in an embodiment of the present application, the liquid cooling plate 41 includes a first bending portion 411 and a second bending portion 412, and a plurality of the first bending portion 411 and the second bending portion 412 are provided, and the first bending portion 411 and the second bending portion 412 are alternately arranged in sequence along the X direction. An angle less than 180° is provided between adjacent first bending portions 411 and second bending portions 412, and the first bending portion 411 cooperates with the second bending portion 412 to form a continuous "V"-shaped structure, which can further enhance the fixing effect of the battery cell 5. Specifically in the embodiment of the utility model, the battery cell 5 can be alternately arranged in the mounting groove 6 to abut against the liquid cooling plate 41 on both sides to achieve effective and reasonable stable assembly.

[0048] Furthermore, in one embodiment of the present application, the liquid cooling plate 41 is arranged in a hollow shape, a flow channel is formed in the hollow part of the liquid cooling plate 41, a heat conduction cavity 424 connected to the flow channel is formed in the connector 42 connected to the liquid cooling plate 41, and the flow channel and the heat conduction cavity 424 are filled with cooling medium, and more specifically, a heat conduction cavity 424 is formed in the main body 422. Based on the above structure, the cooling medium continuously flows in the flow channel and the heat conduction cavity 424, and then continuously exchanges heat with the battery cell 5 arranged close to the liquid cooling plate 41 to achieve temperature regulation of the battery cell 5.

[0049] Furthermore, in one embodiment of the present application, the liquid cooling assembly 4 also includes a liquid cooling pipe 43, a through hole 425 is opened on the connecting piece 42, the liquid cooling pipe 43 is passed through the through hole 425 and is connected to the connecting piece 42, and the liquid cooling pipe 43 is used to transmit the cooling medium to the heat transfer cavity to realize the circulation flow of the heat transfer medium, realize the cooling and heat dissipation of the battery pack, and thereby improve the safety of the battery pack.

[0050] In addition, in one embodiment of the present application, the battery pack further includes a guard plate 3, the guard plate 3 is disposed on the bottom plate 1 and connected to the side beam 2, the guard plate 3 includes a first sub-plate 31 and a second sub-plate 32 which are parallel to each other, the side beam 2 includes a first sub-beam 22 and a second sub-beam 23 which are parallel to each other, wherein the two ends of the first sub-plate 31 are respectively connected to the first ends of the first sub-beam 22 and the second sub-beam 23, and the two ends of the second sub-plate 32 are respectively connected to the second ends of the first sub-beam 22 and the second sub-beam 23. Based on the above structure, the present application connects the first sub-beam 22 and the second sub-beam 23 which are disposed in parallel by providing a guard plate 3, and the first sub-plate 31 and the second sub-plate 32 can also cooperate with the first sub-beam 22 and the second sub-beam 23 to form an assembly area to limit the assembly range of the liquid cooling assembly 4, thereby reducing the positioning time consumption of the liquid cooling assembly 4 during assembly and improving the assembly efficiency of the battery pack.

[0051] In summary, the utility model provides a battery pack, which includes a bottom plate, a side beam and a liquid cooling assembly, wherein the side beam extends along the Y direction and is arranged on the bottom plate and connected to the bottom plate, the liquid cooling assembly extends along the X direction and is connected to the bottom plate, and the liquid cooling assembly includes a liquid cooling plate and a connecting piece, and the liquid cooling plate is connected to the side beam through the connecting piece. Compared with the prior art, the battery pack simplifies the cumbersome assembly operation in the past, and can also obtain a relatively excellent assembly effect for multiple liquid cooling plates.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: The battery pack has an X direction and a Y direction intersecting each other, and the battery pack includes: Bottom plate (1); A side beam (2), the side beam (2) extending along the Y direction and arranged on the bottom plate (1) and connected to the bottom plate (1); A liquid cooling assembly (4), the liquid cooling assembly (4) comprising a plurality of liquid cooling plates (41) and a plurality of connecting pieces (42), the liquid cooling plates (41) being detachably connected to the side beams (2) via the connecting pieces (42), the liquid cooling plates (41) extending along the X direction and having the connecting piece (42) disposed at at least one end, the plurality of liquid cooling plates (41) being spaced apart along the Y direction; A battery cell (5) is arranged between adjacent liquid cooling plates (41), and the battery cell (5) has a first wall (51) and a second wall (52) connected to each other, the first wall (51) being the wall with the largest surface area of ​​the battery cell (5), the first wall (51) being thermally connected to the liquid cooling plate (41), and the second wall (52) being spaced apart from the side beam (2).

2. The battery pack according to claim 1, characterized in that: The side beam (2) is provided with a mounting groove (21), and the connecting piece (42) is provided with an outer protrusion (421), and the outer protrusion (421) is inserted into the mounting groove (21).

3. The battery pack according to claim 2, characterized in that: The outer protrusion (421) is provided with a reinforcing rib (4211).

4. The battery pack according to claim 2, characterized in that: The assembly groove (21) is filled with an adhesive to fixedly connect the side beam (2) and the connecting member (42).

5. The battery pack according to claim 4, characterized in that: The outer convex portion (421) is provided with a guide hole (4212) for the adhesive to flow, and the guide hole (4212) penetrates the outer convex portion (421) along the thickness direction of the outer convex portion (421).

6. The battery pack according to claim 2, characterized in that: The battery pack also has a Z direction, the connecting member (42) has a main body (422), the outer protrusion (421) is connected to the main body (422) and a limiting groove (423) is formed between the two, the limiting groove (423) is openly arranged at one end close to the assembly groove (21) along the Z direction, the outer protrusion (421) is inserted into the assembly groove (21) along the Z direction, and the groove wall of the limiting groove (423) is limitedly matched with the groove wall of the assembly groove (21); wherein the X direction, the Y direction and the Z direction intersect each other.

7. The battery pack according to claim 1, characterized in that: The liquid cooling plate (41) comprises a first bending portion (411) and a second bending portion (412), and a plurality of the first bending portion (411) and a plurality of the second bending portion (412) are provided, and the first bending portion (411) and the second bending portion (412) are alternately arranged in sequence along the X direction.

8. The battery pack according to claim 6, characterized in that: A flow channel is formed in the liquid cooling plate (41), a heat conduction cavity (424) connected to the flow channel is formed in the connecting piece (42), and the flow channel and the heat conduction cavity (424) are filled with cooling medium.

9. The battery pack according to claim 8, characterized in that: The liquid cooling component also includes a liquid cooling pipe (43). A through hole (425) is opened on the main body (422). The liquid cooling pipe (43) is inserted into the through hole (425) and connected to the connecting piece (42). The liquid cooling pipe (43) is used to transmit the cooling medium to the heat conduction cavity (424).

10. The battery pack according to claim 1, characterized in that: The liquid cooling plate (41) is connected to the base plate (1).

11. The battery pack according to claim 1, characterized in that: It also includes a guard plate (3), which is arranged on the bottom plate (1) and connected to the side beam (2), the guard plate (3) includes a first sub-plate (31) and a second sub-plate (32), the side beam (2) includes a first sub-beam (22) and a second sub-beam (23), the two ends of the first sub-plate (31) are connected to the first ends of the first sub-beam (22) and the second sub-beam (23), and the two ends of the second sub-plate (32) are respectively connected to the second ends of the first sub-beam (22) and the second sub-beam (23).

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