Shell assembly and battery pack with same

Abstract

The utility model discloses a shell assembly and a battery pack with the shell assembly, the shell assembly comprises an edge beam, a middle cross beam and a switching structure, the middle cross beam is arranged in the edge beam, and one end of the middle cross beam in the length direction is connected with the edge beam; the adapter structure is arranged at the connecting position of the middle cross beam and the edge beam and comprises an adapter plate, one end face, in the thickness direction, of the adapter plate is connected with the edge beam, a limiting protrusion is arranged on the other end face of the adapter plate, and the middle cross beam is sleeved with the limiting protrusion. According to the shell assembly disclosed by the utility model, the switching structure is arranged at the connecting position of the middle cross beam and the side beam, so that the switching structure can absorb abnormal deformation of the battery pack caused by collision or impact in the test and daily use processes, and the supporting capability of the side beam and the middle cross beam is enhanced; and therefore, the cracking risk caused by stress concentration at the transfer structure is reduced. Meanwhile, the switching structure does not interfere with the arrangement of other structures in the shell assembly and does not interfere with the arrangement of the internal structure of the battery pack.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and in particular to a shell assembly and a battery pack having the same. Background Art

[0002] In the field of new energy, the middle crossbeam of the battery pack can improve the modal state of the entire pack and increase the stiffness of the entire pack. The middle crossbeam and its connection structure with the side beams may encounter vibration and impact during vehicle driving, resulting in the risk of deformation and cracking. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a shell assembly, which can increase strength and reduce the risk of deformation and cracking.

[0004] The utility model also provides a battery pack, which includes the above-mentioned shell assembly.

[0005] According to the shell assembly of the embodiment of the utility model, it includes a side beam, an intermediate cross beam and a transfer structure, the intermediate cross beam is arranged inside the side beam, and one end of the intermediate cross beam in the length direction is connected to the side beam; the transfer structure is arranged at the connection position between the intermediate cross beam and the side beam, and the transfer structure includes a transfer plate, one end face of the transfer plate in the thickness direction is connected to the side beam, and a limiting protrusion is provided on the other end face, and the limiting protrusion is sleeved outside the intermediate cross beam.

[0006] According to the shell assembly of the embodiment of the utility model, by arranging the adapter structure at the connection position between the middle cross beam and the side beam, one end face of the adapter plate in the thickness direction is connected to the side beam, and a limiting protrusion is provided on the other end face, and the limiting protrusion is sleeved outside the middle cross beam. The adapter structure can absorb the abnormal deformation of the battery pack caused by collision or impact during testing and daily use, strengthen the supporting capacity of the side beam and the middle cross beam, thereby reducing the risk of cracking caused by stress concentration at the adapter structure. At the same time, the adapter structure does not interfere with the arrangement of other structures inside the shell assembly, and the adapter structure does not interfere with the internal structure arrangement of the battery pack.

[0007] In some embodiments of the utility model, a cavity is provided in the middle cross beam, and a limit block is provided on the adapter structure. Along the thickness direction of the adapter plate, the limit block is provided on one side of the adapter plate where the limit protrusion is provided and together with the limit protrusion defines the insertion groove of the middle cross beam.

[0008] In some embodiments of the present utility model, there are multiple cavities, the limiting blocks include a first limiting block and a second limiting block, two of the first limiting blocks are provided in each cavity, the first limiting blocks extend along the width direction of the adapter plate, and along the length direction of the cavity, the two first limiting blocks are oppositely arranged; two of the second limiting blocks are provided in each cavity, the second limiting blocks extend along the length direction of the adapter plate, and along the width direction of the cavity, the two second limiting blocks are oppositely arranged.

[0009] In some embodiments of the present utility model, the adapter structure further includes a first connecting portion and a second connecting portion, the first connecting portion connects two opposite first limiting blocks into an integral part; the second connecting portion connects two opposite second limiting blocks into an integral part, and the first connecting portion and the second connecting portion are arranged in a staggered manner.

[0010] In some embodiments of the present utility model, along the width direction of the adapter plate, the length dimension n of the first limiting block satisfies: n≥10mm; and / or, along the length direction of the adapter plate, the length dimension m of the second limiting block satisfies: m≥8mm.

[0011] In some embodiments of the present utility model, the minimum distance g1 between the outer peripheral wall of the middle cross beam and the inner peripheral wall of the limiting protrusion satisfies: 0.1mm≤g1≤0.5mm; and / or, along the thickness direction of the adapter plate, the minimum distance g2 between the middle cross beam and the adapter plate satisfies: 0.1mm≤g2≤0.5mm.

[0012] In some embodiments of the present utility model, along the thickness direction of the adapter plate, the thickness dimension t1 of the adapter plate satisfies: t1≥4mm; and / or, the height dimension h of the limiting protrusion satisfies: h≥10mm; and / or, the wall thickness t of the middle cross beam satisfies 1mm≤t≤2mm.

[0013] In some embodiments of the present utility model, along the width direction of the adapter plate, the minimum distance a between the limiting protrusion and the outer peripheral wall of the adapter plate satisfies: a≥t1; and / or, along the length direction of the adapter plate, the minimum distance b between the limiting protrusion and the outer peripheral wall of the adapter plate satisfies: b≥10mm; and / or, along the length direction of the adapter plate, the thickness dimension t2 of the limiting protrusion satisfies: t2≥2t.

[0014] In some embodiments of the present utility model, the adapter plate is welded to the side beam.

[0015] The battery pack according to the embodiment of the present utility model includes the above-mentioned housing assembly.

[0016] According to the battery pack of the embodiment of the utility model, the adapter structure is arranged at the connection position between the middle cross beam and the side beam, one end face of the adapter plate in the thickness direction is connected to the side beam, and a limiting protrusion is arranged on the other end face, and the limiting protrusion is sleeved outside the middle cross beam. The adapter structure can absorb the abnormal deformation of the battery pack caused by collision or impact during testing and daily use, strengthen the supporting capacity of the side beam and the middle cross beam, thereby reducing the risk of cracking caused by stress concentration at the adapter structure. At the same time, the adapter structure does not interfere with the arrangement of other structures inside the shell assembly, and the adapter structure does not interfere with the internal structure arrangement of the battery pack.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a three-dimensional diagram of a partial structure of a housing assembly according to an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0021] Figure 3 is a top view of a transfer structure and part of an intermediate crossbeam according to an embodiment of the utility model;

[0022] Figure 4 is a cross-sectional view of a transfer structure and part of an intermediate cross beam according to an embodiment of the utility model;

[0023] Figure 5 is a cross-sectional view of the transition structure and part of the middle cross beam according to another angle of the embodiment of the utility model;

[0024] Figure 6 It is a front view of the transfer structure and part of the middle cross beam according to an embodiment of the utility model;

[0025] Figure 7 It is a left side view of the transfer structure and part of the middle cross beam according to the embodiment of the utility model;

[0026] Figure 8 is a top view of a transition structure and a portion of an intermediate crossbeam according to another embodiment of the utility model;

[0027] Figure 9 is a cross-sectional view of a transfer structure and a portion of an intermediate cross beam according to another embodiment of the utility model;

[0028] Figure 10 is a cross-sectional view of the adapter structure and a part of the middle crossbeam from another angle according to another embodiment of the present utility model;

[0029] Figure 11 is a top view of the adapter structure and a part of the middle crossbeam according to still another embodiment of the present utility model;

[0030] Figure 12 is a cross-sectional view of the adapter structure and a part of the middle crossbeam according to still another embodiment of the present utility model;

[0031] Figure 13 is a cross-sectional view of the adapter structure and a part of the middle crossbeam from another angle according to still another embodiment of the present utility model.

[0032] Reference numerals:

[0033] 100, housing assembly;

[0034] 1, side beam;

[0035] 2, middle crossbeam; 21, cavity;

[0036] 3, adapter structure; 31, adapter plate; 32, limiting protrusion; 33, limiting block; 331, first limiting block; 332, second limiting block; 34, first connecting portion; 35, second connecting portion. Detailed implementation manners

[0037] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the features defined with "first", "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Reference below Figures 1 - 13 A housing assembly 100 according to an embodiment of the present invention is described.

[0041] like Figure 1 As shown, the housing assembly 100 according to the embodiment of the utility model includes a side beam 1 , a middle cross beam 2 and a transition structure 3 .

[0042] Specifically, Figure 1 and Figure 2 As shown, the housing assembly 100 is used for a battery pack, the middle cross beam 2 is arranged in the side beam 1, and the length direction of the middle cross beam 2 (such as Figure 4 One end of the third direction (as shown) is connected to the side beam 1, which can increase the force transmission effect between the middle cross beam 2 and the side beam 1, increase the overall strength of the shell assembly 100, and enhance the overall strength of the battery pack.

[0043] like Figures 3 - 7 As shown, the transfer structure 3 is arranged at the connection position between the middle cross beam 2 and the side beam 1, and the transfer structure 3 includes a transfer plate 31 and a limiting protrusion 32. The thickness direction of the transfer plate 31 (such as Figure 4 One end face of the housing assembly 100 (in the third direction shown in the figure) is connected to the side beam 1, and a limiting protrusion 32 is provided on the other end face, and the limiting protrusion 32 is sleeved outside the middle cross beam 2. The transfer structure 3 can absorb the abnormal deformation of the battery pack caused by impact or shock during testing and daily use, strengthen the supporting capacity of the side beam 1 and the middle cross beam 2, and thus reduce the risk of cracking caused by stress concentration at the transfer structure 3. At the same time, the transfer structure 3 does not interfere with the arrangement of other structures inside the housing assembly 100, and the transfer structure 3 does not interfere with the internal structure arrangement of the battery pack.

[0044] According to the shell assembly 100 of the embodiment of the utility model, by setting the adapter structure 3 at the connection position between the middle cross beam 2 and the side beam 1, one end face of the adapter plate 31 in the thickness direction is connected to the side beam 1, and a limiting protrusion 32 is provided on the other end face, and the limiting protrusion 32 is sleeved outside the middle cross beam 2. The adapter structure 3 can absorb the abnormal deformation of the battery pack caused by collision or impact during testing and daily use, strengthen the supporting capacity of the side beam 1 and the middle cross beam 2, and thus reduce the risk of cracking caused by stress concentration at the adapter structure 3. At the same time, the adapter structure 3 does not interfere with the arrangement of other structures inside the shell assembly 100, and the adapter structure 3 does not interfere with the internal structure arrangement of the battery pack.

[0045] In some embodiments of the present invention, the adapter plate 31 is welded to the side beam 1 to avoid excessive thermal impact on the material caused by the welding of the original middle beam 2 and the side beam 1, thereby avoiding affecting the material strength of the middle beam 2 and the side beam 1.

[0046] In some embodiments of the present invention, Figures 8 - 10 As shown, a cavity 21 is provided in the middle cross beam 2, and a limit block 33 is provided on the adapter structure 3. Along the thickness direction of the adapter plate 31, the limit block 33 is provided on one side of the adapter plate 31 where the limit protrusion 32 is provided, and together with the limit protrusion 32, defines a plug-in slot of the middle cross beam 2. By adding the limit block 33, the strength of the adapter structure 3 can be increased, and the middle cross beam 2 is inserted into the plug-in slot, and the adapter structure 3 has a better limiting effect on the middle cross beam 2.

[0047] Furthermore, if Figures 8 - 10 As shown, there are multiple cavities 21, and the limit blocks 33 include a first limit block 331 and a second limit block 332. Two first limit blocks 331 are provided in each cavity 21. The first limit blocks 331 extend along the width direction of the adapter plate 31 (such as Figure 3 The second direction shown in FIG. 2 extends along the length direction of the cavity 21 (as shown in FIG. Figure 3 Two first limit blocks 331 are arranged opposite to each other, so that two, four, or six positions are added to limit the middle cross beam 2 along the length direction of the cavity 21, so that the position of the middle cross beam 2 is more reliable. Two second limit blocks 332 are arranged in each cavity 21, and the second limit blocks 332 are arranged along the length direction of the adapter plate 31 (such as Figure 3 The first direction shown in FIG. 1 extends along the width direction of the cavity 21 (as shown in FIG. 1 ). Figure 3 The second direction shown in the figure), the two second limit blocks 332 are arranged opposite to each other, so that two, four, or six or more limit positions for the middle cross beam 2 are added along the width direction of the cavity 21, so that the position of the middle cross beam 2 is more reliable.

[0048] Furthermore, if Figures 11 - 13As shown, the transfer structure 3 further includes a first connection portion 34 and a second connection portion 35, wherein the first connection portion 34 connects two opposite first limit blocks 331 into an integral part, and the second connection portion 35 connects two opposite second limit blocks 332 into an integral part, and the first connection portion 34 and the second connection portion 35 are arranged alternately. The strength of the transfer structure 3 can be further increased, the connection strength between the middle cross beam 2 and the side beam 1 can be further increased, and the risk of cracking caused by stress concentration at the connection between the middle cross beam 2 and the side beam 1 can be reduced.

[0049] In some embodiments of the present invention, Figure 8 As shown, the length dimension n of the first limit block 331 is ≥ 10 mm. It is understandable that the length dimension n of the first limit block 331 can be 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, etc. The length dimension n of the first limit block 331 is not less than 10 mm, which can ensure the strength of the first limit block 331 and the limiting effect on the middle cross beam 2, increase the overall strength of the transfer structure 3, and increase the overall strength of the housing assembly 100.

[0050] In some embodiments of the present invention, Figure 8 As shown, along the length direction of the adapter plate 31, the length dimension m of the second limit block 332 is ≥ 8 mm. It is understandable that the length dimension m of the second limit block 332 can be 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, etc. The length dimension m of the second limit block 332 is not less than 10 mm, which can ensure the strength of the second limit block 332 and the limiting effect on the middle cross beam 2, increase the overall strength of the adapter structure 3, and increase the overall strength of the housing assembly 100.

[0051] In some embodiments of the present invention, Figure 4As shown, the minimum distance g1 between the outer peripheral wall of the middle cross beam 2 and the inner peripheral wall of the limiting protrusion 32 satisfies: 0.1mm≤g1≤0.5mm. It can be understood that the minimum distance g1 between the outer peripheral wall of the middle cross beam 2 and the inner peripheral wall of the limiting protrusion 32 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm. The minimum distance g1 between the outer peripheral wall of the middle cross beam 2 and the inner peripheral wall of the limiting protrusion 32 is not less than 0.1mm, which can ensure that the limiting block 33 maintains a certain distance from the middle cross beam 2, which is convenient for the assembly of the middle cross beam 2 and the transfer structure 3; the minimum distance g1 between the outer peripheral wall of the middle cross beam 2 and the inner peripheral wall of the limiting protrusion 32 is not greater than 0.5mm, which can ensure the assembly reliability of the middle cross beam 2 and the transfer structure 3 and avoid the separation of the middle cross beam 2 and the transfer structure 3.

[0052] In some embodiments of the present invention, Figure 5 As shown, along the thickness direction of the adapter plate 31, the minimum distance g2 between the middle beam 2 and the adapter plate 31 satisfies: 0.1mm≤g2≤0.5mm. It is understandable that the minimum distance g2 between the middle beam 2 and the adapter plate 31 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm. The minimum distance g2 between the middle beam 2 and the adapter plate 31 is not less than 0.1mm, which can ensure that the limit block 33 maintains a certain distance from the middle beam 2, which is convenient for the assembly of the middle beam 2 and the adapter structure 3; the minimum distance g2 between the middle beam 2 and the adapter plate 31 is not greater than 0.5mm, which can ensure the assembly reliability of the middle beam 2 and the adapter structure 3 and avoid the separation of the middle beam 2 and the adapter structure 3.

[0053] In some embodiments of the present invention, Figure 5 As shown, along the thickness direction of the adapter plate 31, the thickness dimension t1 of the adapter plate 31 is ≥ 4 mm. It is understandable that the thickness dimension t1 of the adapter plate 31 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, etc. The thickness dimension t1 of the adapter plate 31 is not less than 4 mm, which can ensure the strength of the adapter plate 31 and the limiting effect on the middle cross beam 2, increase the overall strength of the adapter structure 3, and increase the overall strength of the shell assembly 100.

[0054] In some embodiments of the present invention, Figure 4As shown, along the thickness direction of the adapter plate 31, the height dimension h of the limit protrusion 32 satisfies h≥10 mm. It can be understood that the height dimension h of the limit protrusion 32 can be 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, etc. The height dimension h of the limit protrusion 32 not less than 10 mm can ensure the strength of the limit protrusion 32 and the limit effect on the middle cross beam 2, increase the overall strength of the adapter structure 3, and increase the overall strength of the housing assembly 100.

[0055] In some embodiments of the present invention, as Figure 4 As shown, along the thickness direction of the adapter plate 31, the wall thickness t of the middle cross beam 2 satisfies 1 mm≤t≤2 mm. It can be understood that the wall thickness t of the middle cross beam 2 can be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm. The wall thickness t of the middle cross beam 2 not less than 1 mm can ensure the strength of the middle cross beam 2 and increase the overall strength of the housing assembly 100; the wall thickness t of the middle cross beam 2 not greater than 2 mm can avoid a relatively large weight of the middle cross beam 2, can reduce the overall weight of the housing assembly 100, and can reduce the overall weight of the battery pack.

[0056] In some embodiments of the present invention, as Figure 3 As shown, along the width direction of the adapter plate 31, the minimum distance a between the limit protrusion 32 and the outer peripheral wall of the adapter plate 31 satisfies a≥t1. While ensuring a certain distance between the limit protrusion 32 and the adapter plate 31, the dimension of the housing assembly 100 along the width direction of the adapter plate 31 can be reduced, and the general adaptability of the housing assembly 100 can be increased.

[0057] In some embodiments of the present invention, as Figure 3 As shown, along the length direction of the adapter plate 31, the minimum distance b between the limit protrusion 32 and the outer peripheral wall of the adapter plate 31 satisfies b≥10 mm. It can be understood that the minimum distance b between the limit protrusion 32 and the outer peripheral wall of the adapter plate 31 can be 10 mm, 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, 13.5 mm, 14 mm, 14.5 mm, 15 mm, etc. The minimum distance b between the limit protrusion 32 and the outer peripheral wall of the adapter plate 31 not less than 10 mm can make the dimension of the adapter plate 31 larger, can increase the structural strength of the adapter plate 31, can increase the overall strength of the adapter structure 3, and can increase the overall strength of the housing assembly 100.

[0058] In some embodiments of the present invention, as Figure 4As shown, along the length direction of the adapter plate 31, the thickness dimension t2 of the limit protrusion 32 ≥ 2t. It can be understood that the thickness dimension t2 of the limit protrusion 32 is not less than twice the wall thickness t of the middle cross beam 2, which can increase the strength of the limit protrusion 32, increase the overall strength of the adapter structure 3, and increase the overall strength of the housing assembly 100.

[0059] The battery pack according to an embodiment of the present invention includes the above-mentioned housing assembly 100.

[0060] In the battery pack according to an embodiment of the present invention, by arranging the adapter structure 3 at the connection position between the middle cross beam 2 and the side beam 1, one end face in the thickness direction of the adapter plate 31 is connected to the side beam 1, and a limit protrusion 32 is provided on the other end face. The limit protrusion 32 is sleeved outside the middle cross beam 2. The adapter structure 3 can absorb abnormal deformation generated due to impact or shock during the test and daily use of the battery pack, strengthen the supporting ability of the side beam 1 and the middle cross beam 2, thereby reducing the cracking risk caused by stress concentration at the adapter structure 3. At the same time, the adapter structure 3 does not interfere with the layout of other structures inside the housing assembly 100, and the adapter structure 3 does not interfere with the layout of the internal structure of the battery pack.

[0061] The other components and operations of the housing assembly 100 according to an embodiment of the present invention and the battery pack having the same are known to those of ordinary skill in the art and will not be described in detail here.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0063] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A housing assembly, characterized in that: include: side beam; An intermediate cross beam, wherein the intermediate cross beam is disposed inside the side beam, and one end of the intermediate cross beam in the length direction is connected to the side beam; A transition structure is arranged at the connection position between the middle cross beam and the side beam, and the transition structure includes a transition plate, one end face of the transition plate in the thickness direction is connected to the side beam, and a limiting protrusion is provided on the other end face, and the limiting protrusion is sleeved outside the middle cross beam.

2. The housing assembly according to claim 1, characterized in that: A cavity is provided in the middle cross beam, and a limit block is provided on the adapter structure. Along the thickness direction of the adapter plate, the limit block is provided on one side of the adapter plate where the limit protrusion is provided and together with the limit protrusion defines the insertion groove of the middle cross beam.

3. The housing assembly according to claim 2, characterized in that: There are multiple cavities, and the limit block includes: A first limit block, wherein two first limit blocks are provided in each of the cavities, the first limit blocks extend along the width direction of the adapter plate, and along the length direction of the cavity, the two first limit blocks are arranged opposite to each other; The second limit blocks are provided in each of the cavities. The second limit blocks extend along the length direction of the adapter plate. The two second limit blocks are arranged opposite to each other along the width direction of the cavity.

4. The housing assembly according to claim 3, characterized in that: The switching structure also includes: A first connecting portion, wherein the first connecting portion connects two opposite first limiting blocks into an integral part; The second connection part connects two opposite second limit blocks into an integral piece, and the first connection part and the second connection part are arranged alternately.

5. The housing assembly according to claim 3, characterized in that: Along the width direction of the adapter plate, the length dimension n of the first limit block is ≥10 mm; And / or, along the length direction of the adapter plate, the length dimension m of the second limit block is ≥8 mm.

6. The housing assembly according to claim 1, characterized in that: The minimum distance g1 between the outer peripheral wall of the intermediate cross beam and the inner peripheral wall of the limiting protrusion satisfies: 0.1mm≤g1≤0.5mm; And / or, along the thickness direction of the adapter plate, the minimum distance g2 between the middle cross beam and the adapter plate satisfies: 0.1 mm≤g2≤0.5 mm.

7. The housing assembly according to claim 1, characterized in that: Along the thickness direction of the adapter plate, The thickness dimension t1 of the adapter plate is ≥4 mm; And / or, the height dimension h of the limiting protrusion is ≥ 10 mm; And / or, the wall thickness t of the middle cross beam satisfies 1mm≤t≤2mm.

8. The housing assembly according to claim 7, characterized in that: Along the width direction of the adapter plate, the minimum distance between the limiting protrusion and the outer peripheral wall of the adapter plate is a≥t1; And / or, along the length direction of the adapter plate, the minimum distance b between the limiting protrusion and the outer peripheral wall of the adapter plate is ≥10 mm; And / or, along the length direction of the adapter plate, the thickness dimension t2 of the limiting protrusion is ≥2t.

9. The housing assembly according to claim 1, characterized in that: The adapter plate is welded to the side beam.

10. A battery pack, characterized in that: include: A housing assembly according to any one of claims 1 to 9.

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