Battery pack and battery module

Abstract

A battery pack (100) and a battery module. The battery pack (100) comprises a case (1), a battery cell module (3) and a connecting assembly (4), wherein at least two cross beams (2) are provided in the case (1), two adjacent cross beams (2) are spaced apart from each other to form an accommodating space (20), and the battery cell module (3) is arranged in the accommodating space (20). At least one connecting assembly (4) is provided, and the connecting assembly (4) is configured to connect the two cross beams (2) which form the accommodating space (20), so as to restrict the deformation of the two cross beams (2) in directions away from each other.

Description

Battery pack and battery module

[0001] The present application claims priority to the Chinese patent application No. 202420815862.9, filed on April 18, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage devices, in particular to a battery pack and a battery module. BACKGROUND

[0003] When assembling the battery pack, the compressibility of the buffer material is usually utilized by pasting the buffer material between two battery cells. During the installation process, a certain pressure needs to be applied manually to make the overall width of the battery cells smaller than the internal width of the box, so that a certain assembly gap is left between the overall battery cells and the box, and the overall battery cells are installed into the box. After the battery cells are installed, the compressed buffer material recovers due to the removal of the applied pressure, and the overall width of the battery cells after the original pasting of the buffer material is slightly larger than the internal width of the box, that is, there is a certain installation interference, so that the inner wall of the box can exert a certain degree of pre-tightening force on the battery cells after the battery cells are installed to facilitate the fixation of the position. SUMMARY

[0004] However, the battery cells also exert a certain reaction force on the box, and in severe cases, the box is even squeezed and deformed, affecting the normal operation of the battery pack.

[0005] The present application provides a battery pack. The battery pack comprises:

[0006] a box, at least two cross beams are arranged in the box, and two adjacent cross beams are arranged at intervals to form a containing space;

[0007] a battery cell module arranged in the containing space;

[0008] a connecting assembly arranged at least once, the connecting assembly is arranged to connect the two cross beams forming the containing space to limit the deformation of the two cross beams in the direction away from each other.

[0009] The present application also provides a battery module comprising a plurality of the above-mentioned battery packs, and the plurality of battery packs are arranged in layers. ADVANTAGEOUS EFFECTS

[0010] The battery pack provided by the present application positions the battery cells by arranging cross beams inside the box and connecting the cross beams at both ends by connecting pieces, which is beneficial to prevent the cross beams from deforming under the extrusion of the battery cells and improves the quality of the battery pack and the battery module.

[0011] The battery module provided by the application comprises a plurality of battery packs as described above, the plurality of battery packs are arranged in layers, and two cross beams surrounding a containing space are connected through a connecting assembly, so that the resistance of the cross beams to the expansion of the battery cell module is improved, the deformation of the cross beams is reduced, and the safety of the battery pack as a whole is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is a structural schematic diagram of a battery module provided by a possible implementation manner of the application.

[0013] Fig. 2 is a structural schematic diagram of a box body and a cross beam provided by a possible implementation manner of the application.

[0014] Fig. 3 is a disassembled structural schematic diagram of a battery module provided by a possible implementation manner of the application.

[0015] Explanation of reference signs:

[0016] 100, battery pack;

[0017] 1, box body; 10, gap; 11, avoiding hole;

[0018] 2, cross beam; 20, containing space; 21, avoiding groove; 22, connecting hole;

[0019] 3, battery cell module; 31, battery cell; 32, tab;

[0020] 4, connecting assembly; 41, screw rod; 42, screw head; 43, nut; 44, insulating sleeve;

[0021] 5, elastic buffer;

[0022] 6, heat insulation piece. Embodiments of the application

[0023] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0024] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, and the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, and the horizontal height of the first feature is lower than that of the second feature.

[0025] In the description of the present embodiment, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are arranged to distinguish the description, and have no special meaning.

[0026] As shown in FIG. 1, the present embodiment provides a battery pack 100 and a battery module, and a plurality of battery packs 100 are stacked to form a battery module. In the present embodiment, the battery pack 100 is mainly improved to prevent deformation due to the expansion force of the battery pack 100.

[0027] Specifically, as shown in FIGS. 2 and 3, the battery pack 100 includes a box body 1, a battery cell module 3 and a connecting assembly 4. At least two cross beams 2 are arranged in the box body 1, and the adjacent two cross beams 2 are arranged to form a containing space 20, and the battery cell module 3 is arranged in the containing space 20. The connecting assembly 4 is provided with at least one group, and the connecting assembly 4 is arranged to connect the two cross beams 2 forming the containing space 20 to limit the deformation of the two cross beams 2 away from each other.

[0028] By arranging the cross beams 2 in the box body 1 and surrounding the containing space 20 between the adjacent two cross beams 2, the battery cell module 3 is arranged in the containing space 20. When the battery cell module 3 expands, the expansion force will be applied to the cross beams 2, which can avoid the direct stress on the box body 1 and is beneficial to prevent the deformation of the box body 1. Furthermore, the connecting assembly 4 is arranged to connect the two cross beams 2 surrounding the containing space 20 to improve the resistance of the cross beams 2 to the expansion of the battery cell module 3 and reduce the deformation of the cross beams 2, thereby improving the safety of the whole battery pack 100.

[0029] In the embodiment, as shown in FIGS. 2 and 3, each battery pack 100 is provided with two crossbeams 2, which are arranged at opposite ends of the box body 1 and parallel to each other to clamp the battery cell module 3 therebetween. Of course, more than two crossbeams 2 can be arranged in the box body 1, and a containing space 20 is formed between each two adjacent crossbeams 2, and a group of battery cell modules 3 can be arranged in each containing space 20.

[0030] Alternatively, in the embodiment, the crossbeams 2 are connected to the inside of the box body 1 by welding, and the connecting assembly 4 is installed after the crossbeams 2 are welded in the box body 1, and then the two crossbeams 2 after welding are connected. In other embodiments, the crossbeams 2 and the box body 1 can also be arranged as an integrated structure, which can be integrally processed by injection molding or casting. The integrally formed structure is more firm and convenient to process.

[0031] Alternatively, as shown in FIGS. 2 and 3, a gap 10 is arranged between the crossbeam 2 and the inner wall of the box body 1. On the one hand, the gap 10 can be provided with electrical elements; on the other hand, the gap 10 can provide a space for the expansion deformation of the crossbeam 2 to avoid extrusion deformation of the box body 1 caused by the crossbeam 2. The sizes of the gaps 10 formed by the two crossbeams 2 and the box body 1 can be the same or different, and in actual cases, the sizes can be designed according to the sizes of the elements to be contained.

[0032] As shown in FIG. 3, the battery cell module 3 includes a plurality of stacked battery cells 31 and tabs 32, and when the battery cell 31 is placed in the containing space 20, the tab 32 will protrude out of the containing space 20. Therefore, the crossbeam 2 is provided with a relief groove 21, and the tab 32 is inserted into the relief groove 21. By providing the relief groove 21 on the crossbeam 2, a relief space is provided for the tab 32.

[0033] Alternatively, as shown in FIG. 3, the bottom of the battery cell module 3 is arranged towards the bottom of the box body 1, and the top of the battery cell module 3 is provided with a heat insulation member 6, which plays a heat insulation role to prevent the temperature at the top of the battery cell 31 from being transmitted to the upper battery pack 100 during charging and discharging, and to prevent the spread of high temperature to the upper battery pack 100 in case of thermal runaway. The heat insulation member 6 can be aerogel, which should be arranged in the battery pack 100 to meet the requirements of flame retardation, heat insulation, electrical insulation, mechanical strength and impact resistance.

[0034] Optionally, as shown in Figure 3, the elastic buffer 5 is arranged between the battery cell module 3 and the cross beam 2, and the elastic buffer 5 can be a vacuum bubble cotton. The elastic buffer 5 can play a heat preservation role to reduce the temperature difference between the two end battery cells 31 and the middle battery cell 31 in the battery cell module 3. In addition, during the process of placing the battery cell module 3 into the box body 1, the elastic buffer 5 is expanded to provide instantaneous pre-tightening force for the battery cell module 3, thereby preventing the battery cell module 3 from falling during the process of entering the box.

[0035] Optionally, as shown in Figure 3, the connecting assembly 4 is provided in two groups, and the two groups of connecting assemblies 4 are arranged on the two sides of the battery cell module 3, respectively, to provide connection for the two cross beams 2 forming the accommodation space 20 on the two sides of the battery cell module 3, so that the connection force between the two cross beams 2 is more balanced and stable, and the deformation of the cross beam 2 is further reduced. Specifically, two connecting assemblies 4 are arranged on the two sides of the battery cell module 3, respectively, to further improve the locking force of the cross beam 2.

[0036] Optionally, the connecting assembly 4 can be detachably connected to the two cross beams 2 to facilitate replacement. Of course, in other embodiments, the connecting assembly 4 can also be connected to the two cross beams 2 by welding, which can achieve the locking and fixing of the two cross beams 2. The specific structure of the connecting assembly 4 and the connection mode of the connecting assembly 4 and the cross beam 2 are not limited herein.

[0037] In this embodiment, as shown in Figure 3, the connecting assembly 4 includes a bolt and a nut 43, the bolt penetrates the two cross beams 2, and the nut 43 is threadedly connected to one end of the bolt penetrating the cross beam 2 to lock the bolt. The two cross beams 2 are provided with connecting holes 22 in alignment, the bolt is sequentially penetrated through the connecting holes 22 of the two cross beams 2, and the nut 43 is tightened to lock, thereby achieving the effect of pulling the two cross beams 2.

[0038] The bolt includes a screw rod 41 and a screw head 42, and an insulating sleeve 44 is sleeved on the screw rod 41. The insulating sleeve 44 is provided for insulation protection to prevent electrical contact with the battery cell 31. Specifically, the insulating sleeve 44 can be a 0.5mm thick heat shrink sleeve, and of course other thicknesses can also be provided as needed.

[0039] Optionally, the nut 43 can be a pull rivet nut, a press rivet nut or a steel wire sleeve. It can be understood that a common nut 43 can also be used, which can be locked with the screw rod 41, and the specific structure of the nut 43 is not limited herein.

[0040] In order to facilitate the insertion of the bolt into the connecting hole 22 of the cross beam 2, as shown in Figure 3, the box body 1 is provided with a avoiding hole 11 opposite to the screw head 42 of the bolt, and the bolt can be inserted into the cross beam 2 through the avoiding hole 11 to prevent the gap 10 between the cross beam 2 and the inner wall of the box body 1 being too small, and the box body 1 blocking the bolt to prevent the bolt from being inserted into the connecting hole 22.

Claims

1. A battery pack, comprising: a box (1), at least two beams (2) being arranged in the box (1), two adjacent beams (2) being spaced apart to form a containing space (20) ; a cell module (3) arranged in the containing space (20) ; a connecting assembly (4) arranged in at least one group, the connecting assembly (4) being arranged to connect two beams (2) forming the containing space (20) to limit the deformation of the two beams (2) in the direction away from each other.

2. The battery pack of claim 1, wherein, The connecting assembly (4) is arranged in two groups, and the two groups of connecting assemblies (4) are arranged on both sides of the cell module (3) respectively.

3. The battery pack of claim 1 or 2, wherein, The connecting assembly (4) comprises a bolt penetrating through the two beams (2) ; a nut (43) threadedly connected to one end of the bolt penetrating through the beam (2) to lock the bolt.

4. The battery pack of claim 3, wherein, The bolt comprises a screw rod (41) and a screw head (42), and an insulating sleeve (44) is sleeved on the screw rod (41).

5. The battery pack of claim 3 or 4, wherein, The nut (43) is a pull rivet nut, a press rivet nut or a steel wire sleeve.

6. The battery pack of any one of claims 3-5, wherein, The box (1) is provided with a clearance hole (11) opposite to the screw head (42) of the bolt, and the bolt can penetrate through the clearance hole (11) to insert into the beam (2).

7. The battery pack of any one of claims 1-6, wherein, A gap (10) is arranged between the beam (2) and the inner wall of the box (1).

8. The battery pack of any one of claims 1-7, wherein, The cell module (3) comprises a plurality of stacked cell (31) and tab (32), and the beam (2) is provided with a clearance groove (21) opposite to the tab (32), and the tab (32) is inserted into the clearance groove (21).

9. The battery pack of any one of claims 1-8, wherein, An elastic buffer (5) is arranged between the cell module (3) and the beam (2).

10. The battery pack of any one of claims 1-9, wherein, The bottom of the cell module (3) is arranged towards the bottom of the box (1), and the top of the cell module (3) is provided with a heat insulating member (6). 11.A battery module, comprising a plurality of battery packs according to any one of claims 1-10, and the plurality of battery packs are arranged in a stacked manner.

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