Battery pack casing and battery pack

Abstract

A battery pack casing and a battery pack. The battery pack casing comprises: a lower housing, a first accommodating recess being formed in the circumferential direction of an opening of the lower housing, the first accommodating recess comprising a first wall (11) close to the central axis of the battery pack casing and a second wall (12) away from the central axis of the battery pack casing, and in the direction of the central axis of the battery pack casing, the extension length of the second wall (12) being greater than the extension length of the first wall (11); and an upper housing, a third wall (21) being formed in the circumferential direction of an opening of the upper housing, a sealant being accommodated in the accommodating recess, and the third wall (21) being inserted into the accommodating recess. The sealant will overflow from the first wall (11) to the inside of the battery pack casing without overflowing to the outside of the battery pack casing; the third wall (21) is fixed in the first accommodating recess by means of the solid-state sealant, thus achieving fixed connection of the upper housing and the lower housing; in addition, there is no gap at the joint of the upper housing and the lower housing, thus ensuring the sealing performance of the battery pack casing, avoiding the risk of sealing failure of the whole battery pack, and ensuring the service life of the battery pack.

Description

Battery pack shell and battery pack Technical Field

[0001] The present application relates to the field of battery technology, and more specifically to a battery pack casing; and also to a battery pack comprising the above-mentioned battery pack casing. Background Art

[0002] With the rapid development of the new energy industry, electric vehicles are gradually becoming a common sight. As the energy provider of electric vehicles, battery packs are particularly important. The sealing of battery packs is particularly crucial. Failure to ensure this seal can lead to the risk of seal failure throughout the battery pack, shortening the battery pack's service life and affecting the vehicle's range.

[0003] Summary of the Invention

[0004] In view of this, the present application provides a battery pack housing and also provides a battery pack including the above-mentioned battery pack housing, which solves the problem that the sealing of the battery pack cannot be guaranteed.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A battery pack housing, comprising:

[0007] The lower housing has a first accommodating groove formed along the circumference of its opening; the first accommodating groove includes a first wall proximate to the central axis of the battery pack housing and a second wall distal to the central axis of the battery pack housing; the second wall extends longer than the first wall along the central axis of the battery pack housing;

[0008] The upper shell has a third wall formed along the circumference of its opening;

[0009] The first accommodating groove contains sealant, and the third wall is inserted into the first accommodating groove to seal and fix the lower shell and the upper shell together.

[0010] Optionally, in the above-mentioned battery pack shell, the difference between the extension length of the first wall and the extension length of the second wall is 0.5 mm-2 mm.

[0011] Optionally, in the above battery pack housing, along the direction of the central axis of the battery pack housing, the distance between the bottom surface of the third wall close to the lower shell and the bottom wall of the first accommodating groove is 0.3 mm-1.3 mm.

[0012] Optionally, in the above-mentioned battery pack housing, the upper shell is formed with a second accommodating groove along the circumference of its opening; the second accommodating groove includes the third wall and a fourth wall; the fourth wall is located on a side of the third wall away from the central axis of the battery pack housing;

[0013] A first abutting surface is formed on a side of the second wall away from the central axis of the battery pack housing;

[0014] The fourth wall is located outside the first accommodating groove and is in close contact with the first abutting surface.

[0015] Optionally, in the above-mentioned battery pack housing, the first abutting surface is extended outwardly from a side of the second wall away from the central axis of the battery pack housing;

[0016] The bottom surface of the fourth wall close to the lower shell is in contact with the first abutting surface.

[0017] Optionally, in the above-mentioned battery pack shell, along the direction of the central axis of the battery pack shell, the gap distance between the bottom surface of the fourth wall close to the lower shell and the first abutting surface is 0.1mm-0.3mm.

[0018] Optionally, in the above-mentioned battery pack shell, along the direction of the central axis of the battery pack shell, the distance between the top surface of the second wall close to the upper shell and the bottom wall of the second accommodating groove is 0.2 mm-1.0 mm.

[0019] Optionally, in the above-mentioned battery pack shell, in the direction from the central axis of the battery pack shell to the edge of the battery pack shell, the gap distance between the second wall (12) and the fourth wall (22) is 0.1mm-0.3mm.

[0020] Optionally, in the above-mentioned battery pack housing, the upper shell is formed with a third accommodating groove along the circumference of its opening; the third accommodating groove includes the third wall and a fifth wall; the fifth wall is located on a side of the third wall close to the central axis of the battery pack housing;

[0021] A second abutting surface integrally formed with the first wall is formed on one side of the first wall close to the central axis of the battery pack housing;

[0022] Along the central axis of the battery pack housing, the extension length of the fifth wall is greater than the extension length of the first wall; the fifth wall is located outside the first accommodating groove and is in contact with the second abutting surface.

[0023] Optionally, in the above-mentioned battery pack housing, the second abutment surface is extended inwardly from the bottom of the upper shell on the side of the first wall close to the central axis of the battery pack housing;

[0024] The bottom surface of the fifth wall close to the lower shell is in contact with the second abutting surface.

[0025] Optionally, in the above-mentioned battery pack shell, when the top surface of the first wall close to the upper shell has an area of ​​sufficient size, the top surface of the first wall close to the side of the central axis of the battery pack shell is the second abutment surface; the bottom surface of the fifth wall close to the lower shell is in contact with the second abutment surface.

[0026] Optionally, in the above-mentioned battery pack shell, the third accommodating groove forms a closed accommodating space for accommodating the sealant.

[0027] Optionally, in the above-mentioned battery pack shell, a first mounting hole is provided on the lower shell; a second mounting hole is provided on the upper shell; and a fastener is passed through the second mounting hole and the first mounting hole in sequence to fix the upper shell and the lower shell together.

[0028] Optionally, in the above-mentioned battery pack shell, the second wall is formed with a widened area; and the first mounting hole is opened in the widened area.

[0029] Optionally, in the above-mentioned battery pack shell, the first wall forms a rectangular ring, and circular chamfers are formed at the four corners of the rectangular ring.

[0030] Optionally, in the above-mentioned battery pack shell, the outer side wall of the lower shell is provided with reinforcing ribs.

[0031] A battery pack comprises a battery cell module and the battery pack shell described above; the battery cell module is placed in the battery pack shell.

[0032] In the battery pack shell and battery pack provided by the present application, a first accommodating groove is formed in the circumference of the opening of the lower shell to limit the third wall of the upper shell to the first accommodating groove; since the extension length of the second wall of the first accommodating groove is greater than the extension length of the first wall, when the third wall is inserted into the first accommodating groove cast with sealant, the sealant will overflow from the first wall with a smaller extension length and close to the central axis of the battery pack shell to the inside of the battery pack shell, and will not overflow to the outside of the battery pack shell; the second wall with a larger extension length forms a sealant blocking structure to prevent the sealant from overflowing, which effectively avoids the outflow and waste of sealant; the sealant has a molten state and a fixed state, and the molten sealant can cover the third wall inserted into the first accommodating groove; then the molten sealant solidifies into a fixed state, and the fixed sealant fixes the third wall in the first accommodating groove, realizing a fixed connection between the upper shell and the lower shell, and there is no gap at the connection between the two, thereby ensuring the sealing of the battery pack shell, avoiding the risk of failure of the sealing of the entire battery pack, and ensuring the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0034] FIG1 is an exploded view of the battery pack of the present application;

[0035] FIG2 is an exploded view of the battery pack housing of the present application;

[0036] FIG3 is a front view of the battery pack housing of the present application;

[0037] FIG4 is a cross-sectional view taken along line AA of FIG3 ;

[0038] FIG5 is a partial enlarged view of area B in FIG4 ;

[0039] FIG6 is a partial enlarged view of another structural form of area B in FIG4;

[0040] FIG7 is a partial enlarged view of another structural form of area B in FIG4;

[0041] FIG8 is a partial enlarged view of another structural form of area B in FIG4;

[0042] FIG9 is a top view of the battery pack housing of the present application.

[0043] In Figures 1 to 9:

[0044] 1. Lower shell; 2. Upper shell; 3. Fasteners; 4. Reinforcement ribs; 5. Sealant;

[0045] 11. First wall; 12. Second wall; 13. First mounting hole; 14. Round chamfer;

[0046] 21. Third wall; 22. Fourth wall; 23. Fifth wall; 24. Second mounting hole. DETAILED DESCRIPTION

[0047] The present application provides a battery pack housing and also provides a battery pack including the battery pack housing.

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] During the assembly of the battery pack, if the sealing of the upper and lower shells cannot be guaranteed, there is a risk of failure of the sealing of the entire battery pack, which will reduce the service life of the battery pack and affect the mileage of the electric vehicle.

[0050] To this end, as shown in Figures 1-9, an embodiment of the present application provides a battery pack housing, comprising a lower housing 1 and an upper housing 2. The lower housing 1 has a first accommodating recess formed along its circumference; the opening of the first accommodating recess faces upward. The first accommodating recess includes a first wall 11 and a second wall 12. The first wall 11 and the second wall 12 extend upward along the central axis of the battery pack housing. The first wall 11 is located on the inner side, and the second wall 12 is located on the outer side, i.e., the first wall 11 is closer to the central axis of the lower housing 1, and the second wall 12 is farther away from the central axis of the lower housing 1. The extension length of the second wall 12 is greater than that of the first wall 11. The upper housing 2 has a third wall 21 formed along its circumference; the third wall 21 extends downward. The first accommodating recess contains sealant. The third wall 21 is inserted into the first accommodating recess to seal and securely connect the third wall 21 to the first accommodating recess, thereby achieving a sealed and secure connection between the lower housing 1 and the upper housing 2.

[0051] It should be noted that the central axis of the lower shell 1 and the central axis of the upper shell 2 are the same as the central axis of the battery pack shell. The inner side refers to the side closer to the central axis of the battery pack shell, and the outer side refers to the side farther from the central axis of the battery pack shell.

[0052] A first accommodating groove is formed around the opening of the lower shell 1 to limit the third wall 21 of the upper shell 2 within the first accommodating groove; since the extension length of the second wall 12 of the first accommodating groove is greater than the extension length of the first wall 11, when the third wall 21 is inserted into the first accommodating groove filled with sealant, the sealant will overflow from the first wall 11 with a smaller extension length and close to the central axis of the battery pack shell to the inside of the battery pack shell, and will not overflow to the outside of the battery pack shell; the second wall 12 with a larger extension length forms a sealant blocking structure to prevent the sealant from overflowing, effectively avoiding the outflow and waste of sealant.

[0053] It should be noted that the sealant has a certain viscosity; along the direction of the central axis of the battery pack shell, the height of the sealant filled in the first accommodating groove can exceed the first wall 11, and the sealant exceeding the first wall 11 will not immediately flow into the interior of the battery pack shell, but will maintain its own shape to a certain extent within a certain period of time; the above-mentioned time period is sufficient to complete the installation of the upper shell 2 in the lower shell 1.

[0054] The sealant has a molten state and a fixed state. The molten sealant can cover the third wall 21 inserted into the first accommodating groove; then the molten sealant solidifies into a fixed state, and the fixed sealant fixes the third wall 21 in the first accommodating groove, realizing a fixed connection between the upper shell 2 and the lower shell 1, and there is no gap at the connection between the two, thereby ensuring the sealing of the battery pack shell, avoiding the risk of sealing failure of the entire battery pack, and ensuring the service life of the battery pack.

[0055] In some embodiments of the present application, along the central axis of the battery pack housing, the difference between the extension length of the first wall 11 and the extension length of the second wall 12 is 0.5 mm to 2 mm. Preferably, the difference between the extension length of the first wall 11 and the extension length of the second wall 12 is 1 mm.

[0056] As described above, the sealant can be effectively prevented from overflowing outside the first wall 11 .

[0057] Furthermore, along the central axis of the battery pack housing, the distance between the bottom surface of the third wall 21 close to the lower shell 1 and the bottom wall of the first accommodating groove is 0.3mm-1.3mm. Preferably, the distance between the third wall 21 and the bottom wall of the first accommodating groove is 1mm.

[0058] As described above, it can be ensured that the extension length of the third wall 21 is not too long, and that when the third wall 21 of the upper shell 2 extends into the first accommodating groove, it does not touch the bottom wall of the first accommodating groove, thereby ensuring that the part of the third wall 21 extending into the first accommodating groove can be fully covered by the sealant, ensuring a firm and stable assembly effect of the third wall 21 in the first accommodating groove.

[0059] Referring to Figures 4 and 9 , in certain embodiments of the present application, the upper housing 2 is formed with a second accommodating recess along its circumference, with its opening facing downward. The second accommodating recess includes a third wall 21 and a fourth wall 22, with the fourth wall 22 extending downward along the central axis of the battery pack housing. The fourth wall 22 is located on the side of the third wall 21 away from the central axis of the upper housing 2. A first abutting surface is integrally formed with the second wall 12 on the side away from the central axis of the lower housing 1. The fourth wall 22 is located outside the first accommodating recess and is in contact with the first abutting surface.

[0060] It should be noted that the direction from the central axis of the battery pack housing to the edge of the battery pack housing is the outward direction, and the direction from the edge of the battery pack housing to the central axis of the battery pack housing is the inward direction. The outer side refers to the side away from the central axis of the battery pack housing; the inner side refers to the side close to the central axis of the battery pack housing.

[0061] The second wall 12 and the first abutting surface are integrally arranged, which means that the second wall 12 and the first abutting surface are connected uninterruptedly, so that when the fourth wall 22 is affixed to the first abutting surface, the third wall 21 and the first accommodating groove are in a closed environment, thereby effectively preventing the sealant from overflowing through the second wall 12 to the outside of the battery pack shell.

[0062] Furthermore, the second wall 12 is a flat plate-shaped structure; the first abutting surface may be the outer side surface of the second wall 12 , or the first abutting surface may be an extended surface extending outward from the outer side surface of the second wall 12 .

[0063] The first accommodating groove and the second accommodating groove are alternately arranged, the third wall 21 of the second accommodating groove is located inside the first accommodating groove, and the fourth wall 22 of the second accommodating groove is located outside the second wall 12 of the first accommodating groove.

[0064] Referring to Figure 6 , when the first abutting surface is the outer side of the second wall 12, the inner side of the fourth wall 22 is in contact with the outer side of the second wall 12. As described above, the second accommodating groove seals the second wall 12 and the third wall 21. The fourth wall 22 of the second accommodating groove forms another sealant barrier, preventing the sealant from overflowing the battery pack housing. The dual protection provided by the fourth wall 22 and the second wall 12 provides even better sealant prevention.

[0065] Please refer to Figure 5. When the first abutting surface is an extension surface extending outward from the outer surface of the second wall 12, the bottom surface of the fourth wall 22 near the lower shell 1 is in contact with the first abutting surface. Preferably, when the bottom surface of the fourth wall 22 near the lower shell 1 is in contact with the first abutting surface, the outer side surface of the second wall 12 is also in contact with the inner side surface of the fourth wall 22. As described above, while preventing glue overflow, it ensures that the outermost side of the lower shell 1 can be aligned and fitted with the outermost side of the upper shell 2, further ensuring the sealing of the battery pack shell.

[0066] In certain embodiments of the present application, along the central axis of the battery pack housing, the distance between the top surface of the second wall 12 near the upper shell 2 and the bottom wall of the second accommodating recess is 0.2 mm to 1.0 mm. Preferably, the distance between the top surface of the second wall 12 near the upper shell 2 and the bottom wall of the second accommodating recess is 0.4 mm.

[0067] As described above, a gap can be ensured between the second wall 12 and the upper shell 2, so that the sealant 5 can also overflow from the second wall 12 until it just fills the gap between the second wall 12 and the upper shell 2, further ensuring a secure sealing connection between the upper shell 2 and the lower shell 1.

[0068] Furthermore, along the central axis of the battery pack housing to the edge of the battery pack housing, the gap between the second wall 12 and the fourth wall 22 is 0.1mm-0.3mm; along the central axis of the battery pack housing, the gap between the bottom surface of the fourth wall 22 near the lower shell 1 and the first abutting surface is 0.1mm-0.3mm. Preferably, the gap between the second wall 12 and the fourth wall 22 is 0.2mm; and the gap between the bottom surface of the fourth wall 22 near the lower shell 1 and the first abutting surface is 0.2mm.

[0069] The amount of sealant 5 overflowing from the second wall 12 is controlled so that it can just fill the gap between the second wall 12 and the upper shell 2, the gap between the second wall 12 and the fourth wall 22, and the gap between the bottom surface of the fourth wall 22 close to the lower shell 1 and the first abutting surface, without overflowing to the outside of the battery pack shell; as described above, while avoiding the waste of sealant 5 flowing out, the secure sealing connection effect between the upper shell 2 and the lower shell 1 is maximized.

[0070] Please refer to Figures 3-8. In certain embodiments of the present application, the upper shell 2 is formed with a third accommodating groove along the circumference of its opening, and the opening of the third accommodating groove faces downward. The third accommodating groove includes a third wall 21 and a fifth wall 23. The fifth wall 23 has a downward extension length along the direction of the central axis of the battery pack shell; the fifth wall 23 is located on the side of the third wall 21 close to the central axis of the battery pack shell. A second abutment surface is formed integrally with the first wall 11 on the side close to the central axis of the battery pack shell. The extension length of the fifth wall 23 is greater than the extension length of the first wall 11; the fifth wall 23 is located outside the first accommodating groove and is in contact with the second abutment surface.

[0071] It should be noted that the integral arrangement of the first wall 11 and the second abutting surface means that the first wall 11 and the second abutting surface are connected uninterruptedly, so as to ensure that when the fifth wall 23 of the third accommodating groove is affixed to the second abutting surface, the first wall 11 is in a closed environment with a certain accommodating space, thereby effectively accommodating the sealant overflowing from the first wall 11.

[0072] The third accommodating groove forms a closed accommodating space for accommodating the sealant, which can effectively prevent the overflowing sealant from flowing turbulently inside the battery pack and avoid adverse effects on other components inside the battery pack shell.

[0073] Furthermore, the height of the sealant 5 filled in the first accommodating groove exceeds the first wall 11; the sealant 5 overflowing from the first wall 11 to the interior of the battery pack shell can fill the third accommodating groove; as above, the sealing connection effect of the upper shell 2 and the lower shell 1 is further guaranteed.

[0074] Referring to Figures 5 and 7 , the second abutting surface extends inward from the inner side surface of the first wall 11. Preferably, the second abutting surface extends inward from the bottom of the inner side surface of the first wall 11, away from the upper housing 2. In this case, the bottom surface of the fifth wall 23, which is adjacent to the lower housing 1, is in contact with the second abutting surface. Furthermore, the size of the second abutting surface can be appropriately increased to ensure a certain gap between the first wall 11 and the fifth wall 23, thereby increasing the space to accommodate sealant that overflows from the first wall 11.

[0075] It should be noted that the first wall 11 forms a rectangular ring, and circular chamfers 14 are formed at the four corners of the rectangular ring.

[0076] Referring to Figure 8 , when the top surface of the first wall 11 near the upper shell 2 has a sufficient area, the second abutting surface can also be the top surface of the first wall 11 near the upper shell 2. In this case, the bottom surface of the fifth wall 23 near the lower shell 1 is in contact with the second abutting surface. As described above, since the top surface of the first wall 11 near the upper shell 2 has a sufficient area, sufficient space is ensured between the bottom wall of the third receiving groove and the top surface of the first wall 11 near the upper shell 2 to accommodate sealant that overflows from the first wall 11.

[0077] Referring to Figures 1-2 and 9 , in certain embodiments of the present application, a first mounting hole 13 is defined in the lower housing 1, and a second mounting hole 24 is defined in the upper housing 2. Fasteners 3 are passed sequentially through the second mounting hole 24 and the first mounting hole 13 to securely connect the upper housing 2 to the lower housing 1.

[0078] As described above, the reliability of the connection between the upper shell 2 and the lower shell 1 is further ensured, and the performance of the battery pack is guaranteed.

[0079] In certain embodiments of the present application, a widened area is formed on the top surface of the second wall 12 close to the upper shell 2; and the first mounting hole 13 is opened on the widened area.

[0080] Furthermore, multiple widened areas are provided and distributed at the corners of the battery pack shell.

[0081] As described above, the convenience of opening the first mounting hole 13 is ensured, and the installation strength of the fastener 3 on the first mounting hole 13 and the second mounting hole 24 is effectively guaranteed, and the connection is more reliable and stable.

[0082] Referring to FIG3 , in certain embodiments of the present application, the outer side wall of the lower housing 1 is provided with reinforcing ribs 4. The provision of the reinforcing ribs 4 effectively increases the strength of the battery pack housing, providing excellent safety protection for the battery pack.

[0083] In summary, the present application also provides a battery pack, which includes a battery cell module and the battery pack shell described above; the battery cell module is placed in the battery pack shell.

[0084] Since the battery pack includes the battery pack shell described above, the beneficial effects of the battery pack brought by the battery pack shell can be found above and will not be repeated here.

[0085] The components and devices involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the accompanying drawings. As will be appreciated by those skilled in the art, these components and devices can be connected, arranged, or configured in any manner. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0086] It should also be noted that in the device of the present application, each component can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as equivalent solutions of the present application.

[0087] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0088] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0089] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery pack housing, characterized in that: include: The lower housing (1) is provided with a first accommodating groove along the circumference of its opening; the first accommodating groove comprises a first wall (11) close to the central axis of the battery pack shell and a second wall (12) away from the central axis of the battery pack shell; in the direction along the central axis of the battery pack shell, the extension length of the second wall (12) is greater than the extension length of the first wall (11); The upper shell (2) is formed with a third wall (21) along the circumference of its opening; The first accommodating groove contains sealant, and the third wall (21) is inserted into the first accommodating groove to seal and fix the lower shell (1) and the upper shell (2) together.

2. The battery pack housing according to claim 1, characterized in that: The difference between the extension length of the first wall (11) and the extension length of the second wall (12) is 0.5 mm-1 mm.

3. The battery pack housing according to claim 1 or 2, characterized in that: In the direction of the central axis of the battery pack housing, the distance between the bottom surface of the third wall (21) close to the lower shell (1) and the bottom wall of the first accommodating groove is 0.3 mm-1.3 mm.

4. The battery pack casing according to any one of claims 1 to 3, characterized in that: The upper shell (2) is formed with a second accommodating groove along the circumference of its opening; the second accommodating groove includes the third wall (21) and the fourth wall (22); the fourth wall (22) is located on a side of the third wall (21) away from the central axis of the battery pack housing; A first abutment surface is formed on one side of the second wall (12) away from the central axis of the battery pack housing and integrally formed therewith; The fourth wall (22) is located outside the first accommodating groove and is in close contact with the first abutting surface.

5. The battery pack housing according to claim 4, characterized in that: The second wall (12) has the first abutment surface extending outwardly from one side of the second wall (12) away from the central axis of the battery pack housing; The bottom surface of the fourth wall (22) close to the lower shell (1) is in close contact with the first abutting surface.

6. The battery pack casing according to claim 5, characterized in that: In the direction of the central axis of the battery pack housing, the gap distance between the bottom surface of the fourth wall (22) close to the lower shell (1) and the first abutment surface is 0.1 mm-0.3 mm.

7. The battery pack casing according to any one of claims 4 to 6, characterized in that: In the direction of the central axis of the battery pack housing, the distance between the top surface of the second wall (12) close to the upper shell (2) and the bottom wall of the second accommodating groove is 0.2 mm-1.0 mm.

8. The battery pack casing according to any one of claims 4 to 7, characterized in that: In the direction from the central axis of the battery pack shell to the edge of the battery pack shell, the gap distance between the second wall (12) and the fourth wall (22) is 0.1 mm-0.3 mm.

9. The battery pack casing according to any one of claims 1 to 8, characterized in that: The upper shell (2) is formed with a third accommodating groove along the circumference of its opening; the third accommodating groove comprises the third wall (21) and a fifth wall (23); the fifth wall (23) is located on a side of the third wall (21) close to the central axis of the battery pack housing; A second abutment surface is formed on one side of the first wall (11) close to the central axis of the battery pack housing and is integrally provided therewith; In the direction of the central axis of the battery pack housing, the extension length of the fifth wall (23) is greater than the extension length of the first wall (11); the fifth wall (23) is located outside the first accommodating groove and is in close contact with the second abutting surface.

10. The battery pack housing according to claim 9, characterized in that: The first wall (11) has a second abutment surface extending inwardly on one side close to the central axis of the battery pack housing and away from the bottom of the upper housing (2); The bottom surface of the fifth wall (23) close to the lower shell (1) is in close contact with the second abutting surface.

11. The battery pack housing according to claim 9, characterized in that: When the top surface of the first wall (11) close to the upper shell (2) has an area of ​​sufficient size, the top surface of the first wall (11) close to the central axis of the battery pack shell is the second abutment surface; and the bottom surface of the fifth wall (23) close to the lower shell (1) is in close contact with the second abutment surface.

12. The battery pack housing according to any one of claims 9 to 11, characterized in that: The third accommodating groove forms a closed accommodating space for accommodating the sealant.

13. The battery pack housing according to any one of claims 1 to 12, characterized in that: The lower shell (1) is provided with a first mounting hole (13); the upper shell (2) is provided with a second mounting hole (24); a fastener (3) is passed through the second mounting hole (24) and the first mounting hole (13) in sequence to fix the upper shell (2) and the lower shell (1).

14. The battery pack housing according to claim 13, characterized in that: The second wall (12) is formed with a widened area; the first mounting hole (13) is opened in the widened area.

15. The battery pack housing according to any one of claims 1 to 14, characterized in that: The first wall (11) forms a rectangular ring, and circular chamfers (14) are formed at the four corners of the rectangular ring.

16. The battery pack housing according to any one of claims 1 to 15, characterized in that: The outer side wall of the lower shell (1) is provided with reinforcing ribs (4).

17. A battery pack, characterized in that: It comprises a battery cell module and a battery pack casing according to any one of claims 1 to 16; the battery cell module is placed in the battery pack casing.

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