Battery pack and battery module

Abstract

The utility model belongs to the technical field of energy storage devices, and discloses a battery pack and a battery module. The battery pack comprises a box body, a battery cell module and a connecting assembly, at least two cross beams are arranged in the box body, every two adjacent cross beams are arranged at intervals to form a containing space, and the battery cell module is arranged in the containing space. The number of the connecting assemblies is at least one, and the connecting assemblies are used for connecting the two cross beams forming the containing space so as to limit the two cross beams from deforming in the direction away from each other. According to the battery pack, the cross beams are arranged in the box body, the accommodating space is defined by the two adjacent cross beams, and the battery cell modules are arranged in the accommodating space, so that when expansion occurs, expansion force is applied to the cross beams, the box body can be prevented from being directly stressed, and deformation of the box body can be prevented. Furthermore, the two cross beams which define the accommodating space are connected by arranging the connecting assembly, so that the resistance of the cross beams to the expansion of the battery cell modules is improved, the deformation of the cross beams is reduced, and the overall safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to a battery pack and a battery module. Background Art

[0002] When assembling the battery pack, buffer materials are usually pasted between the two battery cells, mainly utilizing the compressibility of the buffer materials. During the installation process, it is necessary to manually apply a certain amount of pressure to make the overall width of the battery cell smaller than the internal width of the box, so that a certain assembly gap is left between the battery cell as a whole and the box, and the battery cell can be installed into the box as a whole. After the battery cell is installed, the compressed and deformed buffer material is restored due to the removal of the applied pressure, and because the overall width of the battery cell after the original buffer material is pasted is slightly larger than the internal width of the box, that is, there is a certain amount of installation interference, so that after the battery cell is installed, the inner wall of the box can apply a certain degree of pre-tightening force to the battery cell to facilitate its position fixation.

[0003] However, the battery cells also exert a certain reaction force on the box, which may even cause the box to be squeezed and deformed in severe cases, affecting the normal operation of the battery pack.

[0004] Therefore, there is an urgent need to improve battery packs and battery modules to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a battery pack and a battery module, by arranging a crossbeam inside the box to position the battery cell, and arranging a connecting piece to connect and fix the crossbeam at both ends, which is beneficial to prevent the crossbeam from deforming under the extrusion of the battery cell, thereby improving the quality of the battery pack and the battery module.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Battery pack, including:

[0008] A box body, wherein at least two cross beams are arranged in the box body, and two adjacent cross beams are arranged at intervals to form an accommodating space;

[0009] A battery cell module is arranged in the accommodating space;

[0010] At least one connecting assembly is provided, and the connecting assembly is used to connect the two beams forming the accommodating space to limit the deformation of the two beams in a direction away from each other.

[0011] As an optional solution, two groups of the connection components are provided, and the two groups of the connection components are respectively arranged on both sides of the battery cell module.

[0012] As an optional solution, the connection component includes:

[0013] A bolt, wherein the bolt passes through the two cross beams;

[0014] A nut is threadedly connected to one end of the bolt passing through the crossbeam to lock the bolt.

[0015] As an optional solution, the bolt includes a screw rod and a screw head, and the screw rod is covered with an insulating sleeve.

[0016] As an optional solution, the nut is a pull rivet nut, a pressure rivet nut or a wire thread sleeve.

[0017] As an optional solution, an avoidance hole is provided on the box body facing the screw head of the bolt, and the bolt can pass through the avoidance hole to be inserted into the crossbeam.

[0018] As an optional solution, a gap is provided between the cross beam and the inner wall of the box body.

[0019] As an optional solution, the battery cell module includes a plurality of stacked battery cells and pole tabs, and an avoidance groove is provided on the crossbeam facing the pole tab, and the pole tab is inserted into the avoidance groove.

[0020] As an optional solution, an elastic buffer is sandwiched between the battery cell module and the crossbeam.

[0021] As an optional solution, the bottom of the battery cell module is arranged toward the bottom of the box body, and a heat insulating member is arranged on the top of the battery cell module.

[0022] A battery module comprises a plurality of battery packs as described above, wherein the plurality of battery packs are stacked.

[0023] Beneficial effects:

[0024] The battery pack proposed by the utility model is provided with a crossbeam in the box body, and a storage space is formed between two adjacent crossbeams, and the battery cell module is provided in the storage space. When the battery cell module expands, the expansion force will be applied to the crossbeam, which can avoid the box body from being directly subjected to force, and is conducive to preventing the box body from being deformed. Furthermore, by providing a connecting component to connect the two crossbeams that form the storage space, the crossbeam's resistance to the expansion of the battery cell module is improved, and the deformation of the crossbeam is reduced, thereby improving the overall safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a battery module provided by an embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of a box body and a crossbeam provided in an embodiment of the utility model;

[0027] Figure 3It is a schematic diagram of the disassembled structure of the battery module provided by the embodiment of the utility model.

[0028] In the figure:

[0029] 100. Battery pack;

[0030] 1. Box body; 10. Gap; 11. Avoidance hole;

[0031] 2. Beam; 20. Accommodation space; 21. Avoidance groove; 22. Connection hole;

[0032] 3. Battery module; 31. Battery cell; 32. Tab;

[0033] 4. Connecting assembly; 41. Screw rod; 42. Screw head; 43. Nut; 44. Insulating sleeve;

[0034] 5. Elastic buffer;

[0035] 6. Thermal insulation parts. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] like Figure 1 As shown, this 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 this embodiment, the battery pack 100 is mainly improved to prevent the battery pack 100 from being deformed due to expansion force.

[0041] Specifically, Figure 2 and Figure 3 As shown, the battery pack 100 includes a box body 1, a battery cell module 3 and a connecting assembly 4. At least two beams 2 are arranged in the box body 1. Two adjacent beams 2 are arranged at intervals to form an accommodating space 20. 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 used to connect the two beams 2 forming the accommodating space 20 to limit the deformation of the two beams 2 in the direction away from each other.

[0042] By arranging the crossbeam 2 in the box body 1 and enclosing the accommodation space 20 between two adjacent crossbeams 2, the battery module 3 is arranged in the accommodation space 20. When the battery module 3 expands, the expansion force will be applied to the crossbeam 2, which can avoid the box body 1 from being directly subjected to force, which is beneficial to prevent the box body 1 from being deformed. Furthermore, by arranging the connecting component 4 to connect the two crossbeams 2 that enclose the accommodation space 20, the resistance of the crossbeam 2 to the expansion of the battery module 3 is improved, the deformation of the crossbeam 2 is reduced, and the overall safety of the battery pack 100 is improved.

[0043] In this embodiment, Figure 2 and Figure 3 As shown, each battery pack 100 is provided with two crossbeams 2, which are respectively arranged at opposite ends of the box body 1, and the two crossbeams 2 are arranged in parallel to clamp the battery cell module 3 therebetween. Of course, more than two crossbeams 2 can be arranged in the box body 1, and the above-mentioned accommodation space 20 is formed between two adjacent crossbeams 2, and a group of battery cell modules 3 can be arranged in each accommodation space 20.

[0044] Optionally, in this embodiment, the cross beam 2 is connected to the inside of the box body 1 by welding. Before the connection component 4 is installed, the cross beam 2 is first welded to the box body 1, and then the connection component 4 is installed to connect the two welded cross beams 2. In other embodiments, the cross beam 2 and the box body 1 can also be set as an integrated structure, which can be integrally processed by injection molding or casting. The integrally formed structure is more solid and more convenient to process.

[0045] Alternatively, if Figure 2 and Figure 3 As shown, a gap 10 is provided between the cross beam 2 and the inner wall of the box body 1. On the one hand, electrical components can be arranged in the gap 10; on the other hand, the gap 10 can provide an escape space for the expansion and deformation of the cross beam 2, thereby preventing the cross beam 2 from squeezing and deforming the box body 1. The sizes of the gaps 10 formed by the two cross beams 2 and the box body 1 can be the same or different, and in actual situations, they can be specifically designed according to the size of the components to be accommodated.

[0046] Furthermore, if Figure 3 As shown, the battery module 3 includes a plurality of stacked battery cells 31 and tabs 32. When the battery cell 31 is placed in the accommodation space 20, the tabs 32 will protrude out of the accommodation space 20. For this purpose, an avoidance groove 21 is provided on the crossbeam 2, and the tabs 32 are inserted into the avoidance groove 21. By providing the avoidance groove 21 on the crossbeam 2, an avoidance space is provided for the tabs 32.

[0047] Alternatively, if Figure 3 As shown, the bottom of the battery cell module 3 is arranged toward the bottom of the box body 1, and a heat insulating member 6 is arranged on the top of the battery cell module 3. The heat insulating member 6 plays a role of heat insulation, preventing the top temperature of the battery cell 31 from being transferred to the upper battery pack 100 during charging and discharging, and preventing the high temperature from spreading to the upper battery pack 100 during thermal runaway. The heat insulating member 6 can specifically be aerogel, which is applied to the battery pack 100, which can meet the requirements of flame retardancy and heat insulation, electrical insulation, mechanical strength and impact resistance.

[0048] Alternatively, if Figure 3 As shown, an elastic buffer 5 is sandwiched between the battery module 3 and the crossbeam 2, and the elastic buffer 5 can be specifically made of vacuum foam. The elastic buffer 5 can play a role in heat preservation, reducing the temperature difference between the battery cells 31 at both ends and the middle battery cell 31 in the battery module 3. In addition, when the battery module 3 is placed in the box body 1, the elastic buffer 5 is bounced open to provide instantaneous pre-tightening force for the battery module 3 to prevent the battery module 3 from falling during the box placement process.

[0049] Alternatively, if Figure 3As shown, two groups of connection components 4 are provided, and the two groups of connection components 4 are respectively provided on both sides of the battery module 3, and provide connection for the two beams 2 forming the accommodating space 20 on both sides of the battery module 3, so that the connection force between the two beams 2 is more balanced and stable, and the deformation of the beams 2 is further reduced. Specifically, two connection components 4 are respectively provided on both sides of the battery module 3 to further improve the locking force on the beams 2.

[0050] Optionally, the connection assembly 4 can be detachably connected to the two beams 2 to facilitate replacement. Of course, in other embodiments, the connection assembly 4 can also be connected to the two beams 2 by welding, so as to achieve the locking and fixing of the two beams 2. The specific structural form of the connection assembly 4 and the connection method of the connection assembly 4 and the beam 2 are not limited here.

[0051] In this embodiment, Figure 3 As shown, the connection assembly 4 includes a bolt and a nut 43. The bolt passes through the two beams 2, and the nut 43 is threadedly connected to one end of the bolt passing through the beam 2 to lock the bolt. The two beams 2 are aligned with connection holes 22. The bolts are passed through the connection holes 22 on the two beams 2 in turn, and the nuts 43 are tightened to lock them, so as to achieve the effect of pulling the two beams 2.

[0052] Further, 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 heat shrink sleeve with a thickness of 0.5 mm, and of course, it can also be set to other thicknesses as needed.

[0053] Optionally, the nut 43 can be a pull rivet nut, a pressure rivet nut or a wire screw sleeve. It is understandable that a common nut 43 can also be used, which can be locked with the screw rod 41, and the specific structural form of the nut 43 is not limited here.

[0054] In order to facilitate the insertion of the bolts into the connecting holes 22 on the crossbeam 2, as shown in FIG. Figure 3 As shown, an avoidance hole 11 is provided on the box body 1 opposite to the screw head 42 of the bolt, and the bolt can pass through the avoidance hole 11 and be inserted into the cross beam 2, thereby solving the problem that the gap 10 between the cross beam 2 and the inner wall of the box body 1 is too small and the box body 1 blocks the bolt, resulting in the bolt being unable to be inserted into the connecting hole 22.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (1), wherein at least two cross beams (2) are arranged inside the box body (1), and two adjacent cross beams (2) are arranged at intervals to form a containing space (20); A battery cell module (3) is arranged in the accommodating space (20); At least one connection assembly (4) is provided, and the connection assembly (4) is used to connect the two crossbeams (2) forming the accommodating space (20) so as to limit the two crossbeams (2) from deforming in a direction away from each other.

2. The battery pack according to claim 1, characterized in that: The connection components (4) are provided in two groups, and the two groups of the connection components (4) are respectively arranged on both sides of the battery core module (3).

3. The battery pack according to claim 1, characterized in that: The connection component (4) comprises: A bolt, wherein the bolt passes through the two cross beams (2); A nut (43) is threadedly connected to one end of the bolt passing through the cross beam (2) to lock the bolt.

4. The battery pack according to claim 3, characterized in that: 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 according to claim 3, characterized in that: The nut (43) is a pull rivet nut, a pressure rivet nut or a wire thread sleeve.

6. The battery pack according to claim 3, characterized in that: The box body (1) is provided with an avoidance hole (11) facing the screw head (42) of the bolt, and the bolt can pass through the avoidance hole (11) to be inserted into the crossbeam (2).

7. The battery pack according to claim 1, characterized in that: A gap (10) is provided between the crossbeam (2) and the inner wall of the box body (1).

8. The battery pack according to claim 1, characterized in that: The battery cell module (3) comprises a plurality of stacked battery cells (31) and pole tabs (32); an avoidance groove (21) is provided on the crossbeam (2) facing the pole tabs (32); and the pole tabs (32) are inserted into the avoidance groove (21).

9. The battery pack according to any one of claims 1 to 8, characterized in that: An elastic buffer (5) is sandwiched between the battery core module (3) and the crossbeam (2).

10. The battery pack according to any one of claims 1 to 8, characterized in that: The bottom of the battery cell module (3) is arranged toward the bottom of the box body (1), and a heat insulating member (6) is arranged on the top of the battery cell module (3).

11. A battery module, characterized in that: It comprises a plurality of battery packs as described in any one of claims 1 to 10, wherein the plurality of battery packs are stacked.

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