Shell assembly, battery and battery pack

Abstract

The utility model provides a shell assembly, a battery and a battery pack. The shell assembly comprises a shell, a cover plate assembly and a sealing piece, an opening is formed in one end of the shell, the cover plate assembly is connected with the shell and seals the opening, the sealing piece is arranged between the cover plate assembly and the shell, and the sealing piece bypasses the side edge face of the cover plate assembly and is connected with the cover plate assembly and the shell in a sealed mode. The first sealing part is buckled between the two opposite sides of the shell and the cover plate assembly, the second sealing part protrudes out of the shell, and the thickness T1 of the first sealing part and the thickness T2 of the second sealing part meet the relation that T1 / T2 is larger than or equal to 0.1 and smaller than or equal to 0.8. The thickness T1 of the first sealing part and the thickness T2 of the second sealing part are set to be larger than or equal to 0.1 and smaller than or equal to 0.8, so that the compression amount of the sealing piece can be controlled within a proper range, the sealing piece can achieve the sealing effect and cannot lose efficacy due to excessive compression, and therefore effective sealing between the shell and the cover plate assembly is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a shell assembly, a battery and a battery pack. BACKGROUND

[0002] With the development of battery technology, the safety performance of the battery is also increasingly required, and the sealing of the battery is crucial to the safety performance of the battery. Among them, the sealing of the battery mainly includes the sealing of the battery shell and the cover plate assembly. In the related technology, welding sealing or buckling sealing is often used. When buckling sealing is used, a sealing element is arranged between the shell and the cover plate assembly, and the sealing of the shell and the cover plate assembly is realized by extruding the sealing element. However, in the related technology, when buckling sealing is used, the sealing element is prone to failure, thereby resulting in poor sealing effect of the shell and the cover plate assembly. CONTENT OF THE UTILITY MODEL

[0003] Embodiments of the present application provide a shell assembly, a battery and a battery pack, which can improve the problem of poor sealing effect of the shell and the cover plate assembly in the shell assembly.

[0004] In a first aspect, embodiments of the present application provide a shell assembly, comprising:

[0005] a shell, one end of the shell being formed with an opening;

[0006] a cover plate assembly, connected with the shell and sealing the opening;

[0007] a sealing element, arranged between the cover plate assembly and the shell, the sealing element bypassing the side edge surface of the cover plate assembly and being sealingly connected with the cover plate assembly and the shell; the sealing element comprises a first sealing portion buckled between the opposite sides of the shell and the cover plate assembly, and a second sealing portion protruding from the shell, the thickness T1 of the first sealing portion and the thickness T2 of the second sealing portion satisfy the relationship: 0.1≤T1 / T2≤0.8.

[0008] In an embodiment, the sealing element further comprises a third sealing portion buckled between the side edge surface of the cover plate assembly and the shell, the third sealing portion has a gap with the side edge surface of the cover plate assembly, and the thickness T3 of the third sealing portion and the thickness T2 of the second sealing portion satisfy the relationship: 1≤T3 / T2≤1.5.

[0009] In an embodiment, the shell comprises a buckling portion buckled to one side of the cover plate assembly away from the other end of the shell, and the minimum value T4 of the height difference between the side of the buckling portion away from the cover plate assembly and the side of the cover plate assembly away from the other end of the shell is ≤1mm.

[0010] In an embodiment, the shell further comprises a main body portion, and a support portion buckled to a side of the cover plate assembly facing the other end of the shell, the support portion being connected with the main body portion; an absolute value of a height difference T5 between a lowest point of the support portion in a thickness direction of the cover plate assembly and a connection between the support portion and the main body portion is less than or equal to 5 mm.

[0011] In an embodiment, an outer diameter T6 of the main body portion and an inner diameter T7 of the support portion satisfy a relationship: 0.3 mm≤T6-T7≤10 mm.

[0012] In an embodiment, an inner diameter of the buckling portion is less than or equal to the inner diameter of the support portion.

[0013] In an embodiment, a part of a normal projection of the cover plate assembly and the buckling portion in an axial direction of the shell overlaps, and a width of the overlapping part in a radial direction of the shell is greater than or equal to 0.2 mm.

[0014] In an embodiment, a part of a normal projection of the cover plate assembly and the support portion in the axial direction of the shell overlaps, and a width of the overlapping part in the radial direction of the shell is greater than or equal to 0.2 mm.

[0015] In an embodiment, a width T8 of the buckling portion in the radial direction of the shell and a diameter T9 of the cover plate assembly satisfy a relationship: T8≥0.03T9.

[0016] In an embodiment, a connection between the main body portion and the support portion is provided with a rounded corner, a diameter of the rounded corner being greater than or equal to a thickness of the main body portion.

[0017] In a second aspect, embodiments of the present application provide a battery, comprising:

[0018] The shell assembly according to any one of the above;

[0019] The cell assembly is located in the shell of the shell assembly; and

[0020] The terminal assembly is connected to an end of the shell away from the cover plate assembly in the shell assembly.

[0021] In an embodiment, the cell assembly comprises a first current collector, a second current collector and a winding core, the first current collector is located between the winding core and the terminal assembly, the second current collector is located between the winding core and the cover plate assembly, and a maximum value T10 of a height difference between a side of the cover plate assembly away from the terminal assembly and the second current collector is greater than or equal to 1 mm.

[0022] In a third aspect, embodiments of the present application provide a battery pack, comprising the battery described above.

[0023] Advantages of embodiments of the present application:

[0024] In embodiments of the present application, the shell assembly includes a shell, a cover plate assembly and a sealing member, one end of the shell is formed with an opening, the cover plate assembly is connected with the shell and seals the opening, the sealing member is arranged between the cover plate assembly and the shell, the sealing member bypasses the side edge surface of the cover plate assembly and is sealingly connected with the cover plate assembly and the shell, the sealing member includes a first sealing part clamped between the opposite sides of the shell and the cover plate assembly, and a second sealing part protruding from the shell, the thickness T1 of the first sealing part and the thickness T2 of the second sealing part satisfy the relationship: 0.1≤T1 / T2≤0.8. By setting the thickness T1 of the first sealing part and the thickness T2 of the second sealing part to 0.1≤T1 / T2≤0.8, the compression amount of the sealing member can be controlled within a moderate range, so that the sealing member can not only play a sealing effect, but also will not fail due to excessive compression, thereby ensuring the effective sealing between the shell and the cover plate assembly. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a structural schematic view of a shell assembly provided by an embodiment of the present application;

[0027] Figure 2 is a partial structural schematic view of a shell and a cover plate assembly clamping region provided by an embodiment of the present application;

[0028] Figure 3 is a partial structural schematic view of a shell and a cover plate assembly clamping region provided by an embodiment of the present application;

[0029] Figure 4 is a structural schematic view of a battery provided by an embodiment of the present application.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1, battery;

[0032] 10, shell assembly; 11, shell; 1111, clamping part; 1112, supporting part; 112, main body part; 113, opening; 12, cover plate assembly; 13, sealing member; 131, first sealing part; 132, second sealing part; 133, third sealing part;

[0033] 20, terminal assembly;

[0034] 30, cell assembly; 31, first current collector; 32, second current collector; 33, winding core. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person skilled in the art without any creative work under the premise that the embodiments in the present application are not deviated, belong to the scope of protection of the present application. In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0036] First, the present application provides a shell assembly, such as Figure 1 and Figure 2 As shown, the shell assembly 10 includes a shell 11, the shell 11 forms an accommodation cavity inside, the accommodation cavity is used to accommodate the cell assembly 30, one end of the shell 11 is formed with an opening 113, so as to facilitate the shell assembly of the cell assembly 30.

[0037] The shell assembly 10 includes a cover plate assembly 12, the cover plate assembly 12 is connected with the shell 11 and seals the opening 113, so as to realize the sealing protection of the cell assembly 30 placed in the shell 11, avoid the cell assembly 30 being corroded by the external environment, thereby ensuring the use performance of the battery 1.

[0038] The shell assembly 10 includes a sealing member 13, the sealing member 13 is arranged between the cover plate assembly 12 and the shell 11, the sealing member 13 bypasses the side edge surface of the cover plate assembly 12, and is sealingly connected with the cover plate assembly 12 and the shell 11. That is, the sealing member 13 has elasticity, and the cover plate assembly 12 and the shell 11 can extrude the sealing member 13 when being buckled, so as to realize the sealing connection between the cover plate assembly 12 and the shell 11.

[0039] Among them, as Figure 2As shown, the sealing member 13 includes a first sealing portion 131 clamped between the housing 11 and the cover plate assembly 12 on opposite sides, and a second sealing portion 132 protruding from the housing 11. The thickness T1 of the first sealing portion 131 and the thickness T2 of the second sealing portion 132 satisfy the relationship: 0.1≤T1 / T2≤0.8. That is, the first sealing portion 131 is the portion of the sealing member 13 compressed when the housing 11 and the cover plate assembly 12 are clamped, and the second sealing portion 132 is the portion of the sealing member 13 not compressed. The thickness of the second sealing portion 132 is the initial thickness of the sealing member 13.

[0040] If the ratio of T1 / T2 is too small, the compression of the sealing member 13 when compressed is too large, which may cause the sealing member 13 to fail due to excessive compression, thereby affecting the sealing effect of the housing 11 and the cover plate assembly 12, and even causing the side of the cover plate assembly 12 to expand too much, causing the clamping area of the cover plate assembly 12 and the housing 11 and the pressure relief groove structure provided on the cover plate assembly 12 to deform, thereby affecting the sealing effect. If the ratio of T1 / T2 is too large, the compression of the sealing member 13 when compressed is too small, which may cause the housing 11 and the sealing member 13 and the cover plate to be not tightly clamped, which also affects the sealing effect between the housing 11 and the cover plate assembly 12.

[0041] In the present embodiment, the thickness T1 of the first sealing portion 131 and the thickness T2 of the second sealing portion 132 are set to satisfy the relationship: 0.1≤T1 / T2≤0.8, which can ensure that the compression of the sealing member 13 is controlled within a moderate range, so that the sealing member 13 can not only achieve the sealing effect, but also will not fail due to excessive compression, thereby ensuring the effective sealing between the housing 11 and the cover plate assembly 12.

[0042] In actual production, the ratio can be set to 0.1, 0.2, 0.4, 0.6, or 0.8, and the specific value can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0043] Optionally, as shown in Figs. 1 and 2, the sealing member 13 further includes a third sealing portion 133 clamped between the housing 11 and the side edge surface of the cover plate assembly 12. The third sealing portion 133 has a gap with the side edge surface of the cover plate assembly 12. The thickness T3 of the third sealing portion 133 and the thickness T2 of the second sealing portion 132 satisfy the relationship: 1≤T3 / T2≤1.5. That is, when the sealing member 13 is clamped around the side edge surface of the cover plate assembly 12, the sealing member 13 can maintain a distance with the side edge surface of the cover plate assembly 12 to avoid the sealing member 13 from being compressed to the side edge surface of the cover plate assembly 12 when deformed under stress, thereby avoiding the deformation or collapse of the cover plate assembly 12 during the sealing process, and further ensuring the structural stability of the housing assembly 10 as a whole. Figure 2 and Figure 3 As shown, the sealing member 13 further includes a third sealing portion 133 clamped between the housing 11 and the side edge surface of the cover plate assembly 12. The third sealing portion 133 has a gap with the side edge surface of the cover plate assembly 12. The thickness T3 of the third sealing portion 133 and the thickness T2 of the second sealing portion 132 satisfy the relationship: 1≤T3 / T2≤1.5. That is, when the sealing member 13 is clamped around the side edge surface of the cover plate assembly 12, the sealing member 13 can maintain a distance with the side edge surface of the cover plate assembly 12 to avoid the sealing member 13 from being compressed to the side edge surface of the cover plate assembly 12 when deformed under stress, thereby avoiding the deformation or collapse of the cover plate assembly 12 during the sealing process, and further ensuring the structural stability of the housing assembly 10 as a whole.

[0044] When the first sealing part 131 on the opposite side of the cover plate assembly 12 is compressed, the first compression part is compressed towards the third sealing part 133, and the third sealing part 133 has a gap with the side surface of the cover plate assembly 12, so that the third sealing part 133 can expand. If the expansion of the third sealing part 13 is too large, it means that the compression of the first sealing part 131 is also too large, which can cause the overall sealing of the sealing part 13 to fail, and can also cause the third sealing part 13 to be pressed to the side surface of the cover plate assembly 12, thereby causing the cover plate assembly 12 to deform and affecting the overall structural stability of the shell assembly 10.

[0045] In the embodiments of the present application, the thickness T3 of the third sealing part 133 and the thickness T2 of the second sealing part 132 are set to 1≤T3 / T2≤1.5, so that the expansion of the sealing part 13 is controlled within a moderate range, so that the sealing part 13 can play a sealing effect and will not fail due to excessive expansion, thereby ensuring the effective sealing between the shell 11 and the cover plate assembly 12.

[0046] In actual production, the ratio can be set to 1, 1.1, 1.2, 1.3, 1.4 or 1.5, and the specific value can be selected and adjusted according to actual design requirements, which is not specially limited here.

[0047] As shown in Figure 3 The shell 11 includes a buckling part 1111 buckled to one side of the cover plate assembly 12 away from the other end of the shell 11, and the minimum value T4 of the height difference between the side away from the cover plate assembly 12 of the buckling part 1111 and the side away from the other end of the shell 11 of the cover plate assembly 12 is ≤1mm. That is, when the shell 11 is buckled to the cover plate assembly 12, the upper surface of the buckling part 1111 will protrude from the upper surface of the cover plate assembly 12. If the buckling part 1111 protrudes too much, it will cause the overall height of the shell assembly 10 to be too large, and will also affect the flatness of the surface of the shell assembly 10. By setting the height difference T4 to T4≤1mm, the effective buckling of the shell 11 and the cover plate assembly 12 can be ensured while avoiding a large impact on the overall height of the shell assembly 10.

[0048] The shell 11 also includes a main body part 112 and a support part 1112 buckled to the side of the cover plate assembly 12 facing the other end of the shell 11. The support part 1112 is connected to the main body part 112, and the absolute value of the height difference T5 between the lowest point of the support part 1112 in the thickness direction of the cover plate assembly 12 and the connection between the support part 1112 and the main body part 112 is less than or equal to 5mm.

[0049] When the lowest point of the support portion 1112 in the thickness direction of the cover plate assembly 12 is lower than the connection between the support portion 1112 and the main body portion 112, the support portion 1112 is fastened towards the inside of the main body portion 112. If the height difference is too large, the support portion 1112 may squeeze the cell assembly 30 placed inside the main body portion 112. When the lowest point of the support portion 1112 in the thickness direction of the cover plate assembly 12 is higher than the connection between the support portion 1112 and the main body portion 112, the support portion 1112 is fastened towards the top of the main body portion 112. If the height difference is too large, the overall height of the housing assembly 10 may be too large, which may also result in a low space utilization rate inside the housing 11, thereby affecting the energy density of the battery 1.

[0050] In some embodiments, such as Figure 2 As shown, the outer diameter T6 of the main body 112 and the inner diameter T7 of the support 1112 satisfy the relationship: 0.3mm ≤ T6 - T7 ≤ 10mm. The support 1112 is a bent structure with rounded corners at the bend. The inner diameter of the support 1112 refers to the inner diameter corresponding to the center of the rounded corner. If the difference between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support 1112 is small, it indicates that the support 1112 bends deeply into the housing 11, and since the bend of the support 1112 is formed by rolling, it may cause the support 1112 to break. If the difference between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support 1112 is large, it indicates that the support 1112 bends shallowly into the housing 11, which may result in a poor engagement between the support 1112 and the cover assembly 12.

[0051] In this embodiment, by setting the relationship between the outer diameter T6 of the main body 112 and the inner diameter T7 of the support 1112 to 0.3mm≤T6-T7≤10mm, it is possible to avoid the support 1112 from breaking and to ensure the sealing effect between the housing 11 and the cover plate assembly 12.

[0052] In actual production, the difference can be set to 0.3mm, 1mm, 2mm, 5mm, 8mm or 10mm, etc., and there are no special restrictions here.

[0053] In other embodiments, the inner diameter of the snap-fit ​​portion 1111 is less than or equal to the inner diameter of the support portion 1112 to ensure that the snap-fit ​​portion 1111 and the upper surface of the cover assembly 12 have sufficient snap-fit ​​area, thereby ensuring the sealing effect between the housing 11 and the cover assembly 12.

[0054] The cover plate assembly 12 and the buckle portion 1111 overlap in the axial projection of the shell 11, and the width of the overlapping part in the radial direction of the shell 11 is greater than or equal to 0.2 mm, that is, the upper surface of the cover plate assembly 12 and the sealing part 13 and the buckle width of the buckle portion 1111 are greater than or equal to 0.2 mm, so as to ensure that the buckle portion 1111 and the cover plate assembly 12 have sufficient sealing area, thereby ensuring the effective sealing of the shell 11 and the cover plate assembly 12.

[0055] Correspondingly, the part of the support portion 1112 abutting against the sealing part 13 and the cover plate assembly 12 overlap in the axial projection of the shell 11, and the width of the overlapping part in the radial direction of the shell 11 is greater than or equal to 0.2 mm, that is, the lower surface of the cover plate assembly 12 and the sealing part 13 and the buckle width of the support portion 1112 are greater than or equal to 0.2 mm, so as to ensure that the support portion 1112 and the cover plate assembly 12 have sufficient sealing area, thereby ensuring the effective sealing of the shell 11 and the cover plate assembly 12.

[0056] In addition, as shown in Figure 2 The width T8 of the buckle portion 1111 in the radial direction of the shell 11 and the diameter T9 of the cover plate assembly 12 satisfy the relationship: T8≥0.03T9. If the width of the buckle portion 1111 in the radial direction of the shell 11 is too small, it will also cause the buckle area of the buckle portion 1111 and the cover plate assembly 12 to be too small, thereby affecting the sealing effect of the shell 11 and the cover plate assembly 12.

[0057] In still other embodiments, the connection between the main body portion 112 and the support portion 1112 is provided with a rounded corner, that is, when the support portion 1112 is bent towards the inside of the main body portion 112, the connection between the main body portion 112 and the support portion 1112 is rounded to avoid breakage of the support portion 1112 due to stress concentration during bending.

[0058] The diameter of the rounded corner is greater than or equal to the thickness of the main body portion 112, so as to ensure that the support portion 1112 has sufficient bending radius when bent towards the inside of the main body portion 112, thereby further avoiding breakage of the support portion 1112 due to stress concentration during bending.

[0059] It should be noted that the cover plate assembly 12 is provided with a protrusion to increase the overall gas storage space of the shell assembly 10. When the shell 11 and the cover plate assembly 12 are buckled by the sealing part 13, the distance between the edge of the buckle portion 1111 and the protrusion on the cover plate assembly 12 is greater than or equal to 0, and the distance between the sealing part 13 and the protrusion on the cover plate assembly 12 is greater than or equal to 0, so as to avoid the setting of the protrusion on the cover plate assembly 12 affecting the sealing effect of the shell 11 and the cover plate assembly 12.

[0060] Secondly, the battery provided by the embodiment of the present application comprises a shell assembly, and the specific structure of the shell assembly is referred to the above embodiment. Since the battery adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0061] As shown in Figure 4 , the battery 1 comprises a shell assembly 10, a cell assembly 30 and a terminal assembly 20, the cell assembly 30 is located in the shell 11 of the shell assembly 10, and the terminal assembly 20 is connected with the end of the shell 11 away from the cover plate assembly 12 in the shell assembly 10, that is, the terminal assembly 20 and the cover plate assembly 12 are connected at the two ends of the shell 11 respectively. By arranging the terminal assembly 20 and the cover plate assembly 12 at the two ends of the shell 11, and arranging the pressure relief groove on the cover plate assembly 12, when the battery 1 occurs thermal runaway, only the cover plate assembly 12 will be damaged, and the terminal assembly 20 will not be damaged, and the arrangement of the terminal assembly 20 will not affect the pressure relief of the pressure relief groove, thereby helping to improve the overall safety performance of the battery 1.

[0062] Among them, the cell assembly 30 comprises a first current collector 31, a second current collector 32 and a winding core 33, the first current collector 31 is located between the winding core 33 and the terminal assembly 20, the second current collector 32 is located between the winding core 33 and the cover plate assembly 12, and the maximum value T10 of the height difference between the side of the cover plate assembly 12 away from the terminal assembly 20 and the second current collector 32 is greater than or equal to 1mm. That is, there is enough gas storage space between the cover plate assembly 12 and the second current collector 32 to ensure that the shell assembly 10 has enough gas storage capacity, thereby improving the overall service life of the battery 1.

[0063] Specifically, as shown in Figure 1 and Figure 2 , the shell assembly 10 comprises a shell 11, a cover plate assembly 12 and a sealing element 13, one end of the shell 11 is formed with an opening 113, the cover plate assembly 12 is connected with the shell 11 and seals the opening 113, the sealing element 13 is arranged between the cover plate assembly 12 and the shell 11, the sealing element 13 bypasses the side edge surface of the cover plate assembly 12 and is sealingly connected with the cover plate assembly 12 and the shell 11, the sealing element 13 comprises a first sealing portion 131 clamped between the opposite sides of the shell 11 and the cover plate assembly 12, and a second sealing portion 132 protruding from the shell 11, and the thickness T1 of the first sealing portion 131 and the thickness T2 of the second sealing portion 132 satisfy the relationship: 0.1≤T1 / T2≤0.8. By setting the thickness T1 of the first sealing portion 131 and the thickness T2 of the second sealing portion 132 to 0.1≤T1 / T2≤0.8, the compression amount of the sealing element 13 can be controlled within a moderate range, so that the sealing element 13 can not only play a sealing effect, but also will not fail due to excessive compression, thereby ensuring the effective sealing between the shell 11 and the cover plate assembly 12.

[0064] Finally, the application also provides a battery pack, which comprises the battery, the specific structure of which is referred to the above embodiments. Since the battery pack adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0065] The above has introduced the embodiments of the application in detail, and the principles and implementation manners of the application have been described by applying specific examples; the above embodiment descriptions are only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation manners and application ranges will have changes; in conclusion, the content of the specification should not be understood as the limitation of the application.

Claims

1. A housing assembly, characterized by, The shell includes an opening formed at one end thereof; The cover plate assembly is connected to the shell and seals the opening; The seal is arranged between the cover plate assembly and the shell, and is sealingly connected to the cover plate assembly and the shell by bypassing the side surface of the cover plate assembly; the seal includes a first sealing portion clamped between the opposite sides of the shell and the cover plate assembly, and a second sealing portion protruding from the shell; the thickness T1 of the first sealing portion and the thickness T2 of the second sealing portion satisfy the relationship: 0.1≤T1 / T2≤0.

8. The seal further includes a third sealing portion clamped between the side surface of the cover plate assembly and the shell; the third sealing portion has a gap with the side surface of the cover plate assembly; the thickness T3 of the third sealing portion and the thickness T2 of the second sealing portion satisfy the relationship: 1≤T3 / T2≤1.

5.

2. The housing assembly of claim 1, wherein, The shell includes a clamping portion clamped to one side of the cover plate assembly away from the other end of the shell; the minimum height difference T4 between the side of the clamping portion away from the cover plate assembly and the side of the cover plate assembly away from the other end of the shell is less than or equal to 1 mm.

3. The housing assembly of claim 1, wherein, The shell further includes a main body portion and a support portion clamped to the side of the cover plate assembly facing the other end of the shell; the support portion is connected to the main body portion; the absolute value of the height difference T5 between the lowest point of the support portion in the thickness direction of the cover plate assembly and the connection between the support portion and the main body portion is less than or equal to 5 mm.

4. The housing assembly of claim 3, wherein, The outer diameter T6 of the main body portion and the inner diameter T7 of the support portion satisfy the relationship: 0.3mm≤T6-T7≤10mm.

5. The housing assembly of claim 4, wherein, The inner diameter of the clamping portion is less than or equal to the inner diameter of the support portion.

6. The housing assembly of claim 4, wherein, The cover plate assembly and the clamping portion overlap in the axial projection of the shell, and the width of the overlapping portion in the radial direction of the shell is greater than or equal to 0.2 mm.

7. The housing assembly of claim 3, wherein, The portion of the support portion abutting the seal and the cover plate assembly overlap in the axial projection of the shell, and the width of the overlapping portion in the radial direction of the shell is greater than or equal to 0.2 mm.

8. The housing assembly of claim 4, wherein, The width T8 of the clamping portion in the radial direction of the shell and the diameter T9 of the cover plate assembly satisfy the relationship: T8≥0.03T9.

9. The housing assembly of claim 3, wherein, The connection between the main body portion and the support portion is provided with a rounded corner, and the diameter of the rounded corner is greater than or equal to the thickness of the main body portion.

10. The housing assembly of claim 4, wherein, The shell assembly of any one of claims 1 to 10; 11. A battery, characterized by The cell assembly is located in the shell of the shell assembly; And The terminal assembly is connected to the end of the shell away from the cover plate assembly in the shell assembly. The cell assembly includes a first current collector, a second current collector, and a roll core; the first current collector is located between the roll core and the terminal assembly; the second current collector is located between the roll core and the cover plate assembly; the maximum height difference T10 between the side of the cover plate assembly away from the terminal assembly and the second current collector is greater than or equal to 1 mm. The battery of claim 11 or 12.

12. The battery of claim 11, wherein, ​ 13. A battery pack, characterized by ​

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