Battery module frame assembly, battery module and battery pack

Abstract

The utility model provides a battery module frame assembly, a battery module and a battery pack. The battery module frame assembly is used for accommodating and bundling a plurality of battery cells (1) which are arranged in parallel along an X direction, and comprises two end plates (3) which are oppositely arranged in the X direction and two side plates (2) which are oppositely arranged in a Y direction perpendicular to the X direction, and two ends of each side plate (2) in the X direction are fixedly connected with the two end plates (3) respectively; each side plate (2) is made of PET (Polyethylene Terephthalate), and a heat insulation plate (4) is fixed on the inner side surface of each side plate (2). By utilizing the battery module frame assembly, the manufacturing cost can be obviously reduced, and the problems that the structure or parts are invalid and the heat of the battery core is transferred to the adjacent module to influence the safety are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and specifically, to a battery module frame assembly, a battery module and a battery pack. Background Art

[0002] In recent years, the energy storage industry has been developing day by day, and new energy storage has risen rapidly, especially electrochemical energy storage as a representative. As a key link of electrochemical energy storage, the energy storage battery system plays an irreplaceable role, and the battery module is the core of the energy storage battery system.

[0003] A battery module generally consists of multiple battery cells, end plates, steel belts, and CCS (Cell collection system) components. After multiple battery cells are stacked, they are compressed by the end plates, and then tied up by two upper and lower steel belts. Finally, the CCS components are combined on the upper part of the battery cells to form a complete battery cell module. There is also a design that uses two metal side plates and two end plates welded end to end to form a battery module frame assembly to replace the steel belt. Whether using a steel belt or a metal side plate, there is a problem of high cost.

[0004] In addition, battery modules are usually arranged in a battery pack in a side-by-side manner. When each battery module is charged and discharged, heat will be generated. However, the existing battery modules either do not have a heat insulation plate, which may cause the temperature to transfer to adjacent battery modules, resulting in an overall temperature rise or thermal runaway, thus affecting safety; or the heat insulation plate is directly adhered to the side of the battery module, and then the end plate is compressed and the steel belt is tied up. In this way, when the battery module rebounds after being compressed, the heat insulation plate will be torn and deformed laterally, which may lead to structural failure. Summary of the Utility Model

[0005] To solve at least a part of the above technical problems, the utility model provides a battery module frame assembly and a battery module.

[0006] As the first aspect of the utility model, a battery module frame assembly is provided. The battery module frame assembly is used to accommodate and tie up multiple battery cells arranged side by side or stacked along a first direction. Wherein, the battery module frame assembly includes: two end plates opposed to each other in the first direction and two side plates opposed to each other in a second direction perpendicular to the first direction; both ends of each side plate in the first direction are fixedly connected to the two end plates respectively; the material of each side plate is PET (polyethylene terephthalate), and a heat insulation plate is fixedly arranged on the inner side surface of each side plate.

[0007] Optionally, both ends of each side plate are fixedly connected to the two end plates respectively through threaded connectors.

[0008] Optionally, both ends of each side plate are respectively formed into bent portions that are bent toward the corresponding end plate, and first connection holes are formed in each bent portion; corresponding second connection holes are formed on both sides of each end plate in the second direction; each of the threaded connectors passes through the corresponding first connection hole and second connection hole in the first direction to fixedly connect the corresponding side plate and end plate.

[0009] Optionally, each side plate and the corresponding heat insulation plate are fixed together in a pasted manner.

[0010] Optionally, the material of each heat insulation plate is ceramic aerogel, fireproof cloth, rock wool board or a combination thereof.

[0011] Optionally, the material of each end plate is a composite material, such as SMC (unsaturated polyester fiberglass reinforced molding compound).

[0012] Optionally, along the second direction, the thickness of each side plate is 0.8 mm to 1.2 mm; and / or the thickness of each heat insulation plate is 0.8 mm to 1.2 mm.

[0013] Optionally, the thickness of each side plate is the same as the thickness of each heat insulation plate, for example, both are 1.0 mm.

[0014] As a second aspect of the present invention, there is provided a battery module, which includes: the above-mentioned battery module frame assembly; and a plurality of battery cells accommodated and bundled by the battery module frame assembly.

[0015] Optionally, in the battery module, each heat insulation plate contacts but is not fixed to each battery cell.

[0016] Optionally, the battery module further includes a CCS assembly located at the top of the plurality of battery cells in a third direction perpendicular to the first direction and the second direction, and both ends of the CCS assembly in the first direction are respectively connected to the tops of the two end plates.

[0017] Optionally, in a third direction perpendicular to the first direction and the second direction, the size of each side plate is 80% to 100% of the size of each battery cell.

[0018] As a third aspect of the present invention, there is provided a battery pack, which includes a plurality of the above-mentioned battery modules.

[0019] The battery module frame assembly and the battery module provided by the present invention adopt a PET side plate fixedly connected to the end plate, and a heat insulation plate is fixed on the inner side surface of the side plate. In this way, while ensuring a good fixing effect on the battery cells, the manufacturing cost is significantly reduced, and the problems of structural or component failure and heat transfer of the battery cells to adjacent modules, which affect safety, are effectively avoided. Description of the Drawings

[0020] The accompanying drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the accompanying drawings:

[0021] Figure 1 It is a schematic exploded view of the structure of the battery module provided by an embodiment of the present utility model;

[0022] Figure 2 It is a schematic diagram of the structure of the battery module provided by an embodiment of the present utility model.

[0023] List of reference numerals:

[0024] 1, battery cell; 11, battery cell terminal; 2, side plate; 21, bent portion; 22, first connection hole; 3, end plate; 31, second connection hole; 32, positioning groove; 33, bolt hole; 34, through hole; 35, grid-shaped heat dissipation area; 4, heat insulation plate; 5, CCS component; 51, bus bar; 52, flexible circuit board; 53, plastic suction plate; 54, output pole of flexible circuit board; 55, output pole of bus bar; 61, threaded connector; 62, bolt. Specific embodiments

[0025] To enable those skilled in the art to better understand the technical solutions of the present utility model, the following will describe in detail the battery module frame assembly and the battery module provided by the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described are only used to illustrate and explain the present utility model and do not limit the present utility model.

[0026] It can be understood that, without conflict, the various embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0027] It can be understood that, for the convenience of description, only the parts related to the embodiments of the present utility model are shown in the accompanying drawings of the present utility model, and the parts unrelated to the embodiments of the present utility model are not shown in the accompanying drawings.

[0028] It can be understood that the ordinal numbers "first", "second", etc. used in the present utility model are only for distinguishing descriptions and cannot be understood as indicating or implying relative importance or order.

[0029] As the first aspect of the present utility model, a battery module frame assembly is provided.

[0030] Such as Figure 1 And Figure 2As shown, the battery module frame assembly is used to accommodate and bundle a plurality of battery cells 1 arranged side by side (or stacked) along the X direction (or the first direction, or the longitudinal direction of the battery module) in the figure. The battery module frame assembly includes: two end plates 3 opposed in the X direction and two side plates 2 opposed in the Y direction (or the second direction, or the transverse direction of the battery module) perpendicular to the X direction. Wherein, both ends of each side plate 2 in the X direction are respectively fixedly connected to the two end plates 3; the material of each side plate 2 is PET (polyethylene terephthalate), and a heat insulation plate 4 is fixedly arranged on the inner side surface of each side plate 2.

[0031] The battery module frame assembly provided by the present utility model uses side plates made of PET material to replace the steel belts or metal side plates in the related art. While ensuring good fixing effect on the battery cells, the manufacturing cost is significantly reduced. At the same time, a heat insulation plate is fixedly arranged on the inner side surface (i.e., the side facing the battery cells) of each side plate, effectively avoiding the problem that the overall temperature rises or thermal runaway affects safety due to the transfer of heat from the battery cells to adjacent modules. And because the heat insulation plate is fixed on the side plate rather than on the battery cells, the problem that the battery cells tear the heat insulation plate under the action of expansion force, resulting in structural or component failure, is also avoided.

[0032] In some embodiments, as Figure 1 and Figure 2 shown, both ends of each side plate 2 are respectively fixedly connected to the two end plates 3 through threaded connectors 61. The threaded connectors 61 can be bolts, screws, etc.

[0033] Compared with the related art, when bundling battery cells with a closed-loop steel belt, if it is desired to maintain or replace the steel belt after being fixed in a group, it is difficult to remove the steel belt due to the expansion of the battery cells, or when welding the metal side plate and the end plate into a frame assembly, it is difficult to disassemble. By using threaded connectors such as bolts to fix the side plate and the end plate, the battery module frame assembly can be easily disassembled when needed after being fixed in a group.

[0034] In some embodiments, as Figure 1 and Figure 2 shown, in order to facilitate the connection / dismantling between the side plate 2 and the end plate 3, both ends of each side plate 2 respectively form bending parts 21 bent towards the corresponding end plate 3, and first connection holes 22 are opened on each bending part 21. Correspondingly, second connection holes 31 corresponding to the first connection holes 22 are formed on both sides of each end plate 3 in the Y direction. Each threaded connector 61 passes through (screws into) the corresponding first connection hole 22 and second connection hole 31 along the X direction to fixedly connect the corresponding side plate 2 and end plate 3.

[0035] In some embodiments, the bent portion 21 has a stepped structure as shown in the figure. Two first connection holes 22 are formed on each bent portion 21, and each first connection hole 22 is formed on the lug portion at the end of the bent portion 21. Correspondingly, positioning grooves 32 matching the contour of the bent portion 21 can be respectively formed on both sides of each end plate 3 in the Y direction to facilitate the positioning of the bent portion 21. Exemplarily, the second connection hole 31 and / or the first connection hole 22 can be threaded holes to facilitate fixation using a threaded connector 61. Exemplarily, the number of the first connection holes 22 on each bent portion 21 can also be 1 or more than 3.

[0036] In some embodiments, each side plate 2 and the corresponding heat insulation plate 4 are fixed together in a pasting manner. This pasting fixation can be achieved by using any suitable adhesive or double-sided tape etc. (such as 3M tape), and the present utility model does not make special regulations thereon.

[0037] In some embodiments, the material of the heat insulation plate 4 is a heat insulation material to achieve heat insulation between modules, prevent the temperature of the battery cells in the module from rising or when the battery cells reach thermal runaway, prevent the temperature from being transmitted to adjacent modules and affecting the overall performance and safety. Exemplarily, the material of the heat insulation plate 4 is ceramic aerogel, fireproof cloth, rock wool board or a combination thereof. The material of the heat insulation plate 4 can also be other materials mainly for heat insulation and heat absorption, and the present utility model does not make special regulations thereon.

[0038] In some embodiments, the thickness of each side plate 2 is 0.8 mm to 1.2 mm, and the thickness of each heat insulation plate 4 is 0.8 mm to 1.2 mm. Exemplarily, each side plate 2 and each heat insulation plate 4 can have the same thickness. Exemplarily, the thickness of each side plate 2 and each heat insulation plate 4 can be 1.0 mm.

[0039] In some embodiments, in the Z direction (or referred to as the third direction, or the height direction of the battery module) perpendicular to the X direction and the Y direction, the size of each side plate 2 is 80% to 100% of the size of each battery cell 1. By adopting relatively wide side plates, the strength of the entire battery module frame assembly can be ensured. Exemplarily, the size of each side plate 2 in the X direction is 300 to 1000 mm, and the size in the Y direction is 100 to 300 mm.

[0040] In some embodiments, each side plate 2 and the heat insulation plate 4 are substantially rectangular plates. Additionally, each side plate 2 and the heat insulation plate 4 can have a structure symmetric in the X direction and the Z direction to improve universality.

[0041] In some embodiments, the material of the end plate 3 is a composite material. Exemplarily, the composite material is SMC (unsaturated polyester glass fiber reinforced molding compound).

[0042] In some embodiments, asFigure 1 As shown, on the outer side surface of the end plate 3, a grid-shaped heat dissipation area 35 is formed by being recessed or penetratingly formed towards the inner side in contact with the surface of the battery cell 1, so as to facilitate heat dissipation of the battery cell 1 through the end plate 3. A bolt hole 33 may be provided at the top (in the Z direction) of the end plate 3 for fixing the end plate 3 to the bus bar output pole 55 and the flexible circuit board output pole 54 in the CCS assembly 5 through bolts 62. Through holes 34 along the Z direction may also be formed on both side portions of the end plate 3 in the Y direction for fixing the entire battery module to an external device.

[0043] As a second aspect of the present utility model, a battery module is provided.

[0044] As Figure 1 and Figure 2 shown, the battery module includes the battery module frame assembly provided in the first aspect of the present utility model, and further includes the aforementioned multiple battery cells 1 accommodated and bundled by the battery module frame assembly.

[0045] In Figure 2 the assembled state shown, each battery cell 1 is arranged (stacked) side by side in the X direction with the large surfaces of the battery cells in contact with each other. The number and size of the battery cells 1, as well as the sizes of the side plates 2 and the end plates 3, are designed such that each heat insulation plate 4 (in the Y direction) contacts the surface of each battery cell 1 facing the heat insulation plate 4. As described above, only contact exists between the heat insulation plate 4 and the battery cell 1, but they are not fixed to each other by means such as adhesives or welding, thus avoiding the problem that the battery cell 1 tears the heat insulation plate 4 under the action of the expansion force, resulting in structural or component failure.

[0046] In some embodiments, in Figure 2 the assembled state shown, in the X direction, each side plate 2 is in a tensioned state to apply a pulling force to the two end plates 3, so that the two end plates 3 clamp the multiple battery cells 1 arranged side by side, thereby ensuring electrical contact between adjacent battery cells 1; in the Y direction, each heat insulation plate 4 presses against the surface of each battery cell 1 in contact with the heat insulation plate 4 with a certain force. In this way, the end plates 3 and the heat insulation plates 4 press against the battery cells 1 in the X and Y directions respectively, thereby effectively bundling and fixing the multiple battery cells 1.

[0047] In some embodiments, the battery module further includes a CCS assembly 5 located at the top of the multiple battery cells 1 in the Z direction, and both ends of the CCS assembly 5 in the X direction are respectively connected to the tops of the two end plates 3.

[0048] In some embodiments, as Figure 1As shown, the CCS component 5 includes a busbar 51, a flexible printed circuit board (FPC) 52, and a plastic suction board 53. The busbar 51 is fixed on the plastic suction board 53 and welded to the pole post of the battery cell 1. The output pole 55 of the busbar and the output pole 54 of the flexible printed circuit board are fixed to the bolt hole 33 at the top of the end plate 3 through bolts 62, thereby connecting the CCS component to the top of the end plate 3.

[0049] As a third aspect of the present utility model, a battery pack is provided, which includes a plurality of battery modules provided by the second aspect of the present utility model.

[0050] In some embodiments, the plurality of battery modules are arranged side by side in the Y direction in the battery pack, that is, the adjacent side plates 2 of the adjacent battery modules face each other.

[0051] It can be understood that the battery pack may further include other components or accessories such as a battery box, a battery module fixing member, an electrical connection member, or an element disposed between adjacent battery modules. The remaining conventional structures of the battery pack will not be elaborated here.

[0052] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present utility model. However, the present utility model is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present utility model, and these modifications and improvements are also regarded as the protection scope of the present utility model.

Claims

1. A battery module frame assembly for accommodating and bundling a plurality of battery cells (1) arranged side by side in a first direction (X), characterized in that, the battery module frame assembly includes: two end plates (3) opposed to each other in the first direction (X) and two side plates (2) opposed to each other in a second direction (Y) perpendicular to the first direction (X); both ends of each side plate (2) in the first direction (X) are fixedly connected to the two end plates (3) respectively; the material of each side plate (2) is PET, and a heat insulation plate (4) is fixed on the inner surface of each side plate (2).

2. The battery module frame assembly according to claim 1, characterized in that, both ends of each side plate (2) are fixedly connected to the two end plates (3) respectively through threaded connectors (61).

3. The battery module frame assembly according to claim 2, characterized in that, both ends of each side plate (2) are respectively formed into bent portions (21) bent towards the corresponding end plates (3), and first connection holes (22) are formed in each bent portion (21); corresponding second connection holes (31) are formed on both sides of each end plate (3) in the second direction (Y); each threaded connector (61) passes through the corresponding first connection hole (22) and second connection hole (31) in the first direction (X) to fixedly connect the corresponding side plate (2) and end plate (3).

4. The battery module frame assembly according to any one of claims 1 to 3, characterized in that, each side plate (2) and the corresponding heat insulation plate (4) are fixedly together by pasting; and / or the material of each heat insulation plate (4) is ceramic aerogel, fireproof cloth, rock wool board or a combination thereof; and / or the material of each end plate (3) is a composite material.

5. The battery module frame assembly according to any one of claims 1 to 3, characterized in that, Along the second direction (Y): the thickness of each side plate (2) is 0.8 mm to 1.2 mm; and / or the thickness of each heat insulation plate (4) is 0.8 mm to 1.2 mm; and / or the thickness of each side plate (2) is the same as the thickness of each heat insulation plate (4).

6. A battery module, characterized in that, The battery module includes: the battery module frame assembly according to any one of claims 1 to 5; and the plurality of battery cells (1) accommodated and bundled by the battery module frame assembly.

7. The battery module according to claim 6, characterized in that, each heat insulation plate (4) contacts but is not fixed to each battery cell (1).

8. The battery module according to claim 7, wherein The battery module frame assembly bundles the plurality of battery cells (1) such that: along the first direction (X), each side plate (2) is in a tensioned state to apply a pulling force to the two end plates (3), so that the two end plates (3) clamp the plurality of battery cells (1); along the second direction (Y), each heat insulation plate (4) presses against the surface of each battery cell (1) in contact with the heat insulation plate (4).

9. The battery module according to any one of claims 7 to 8, characterized in that, The battery module further includes a CCS component (5) located at the top of the plurality of battery cells (1) in a third direction (Z) perpendicular to the first direction (X) and the second direction (Y), and two ends of the CCS component (5) in the first direction (X) are respectively connected to the tops of the two end plates (3); and / or In a third direction (Z) perpendicular to the first direction (X) and the second direction (Y), the size of each side plate (2) is 80% to 100% of the size of each battery cell (1).

10. A battery pack, characterized in that, The battery pack includes a plurality of battery modules according to any one of claims 6 to 9.

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