Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises at least one battery cell, the first shell comprises at least one sleeve, and the battery cell is at least partially accommodated in the accommodating cavity; the second shell at least partially covers the first shell along the upper part; the third shell at least partially covers the sleeve along the two sides of the axial direction of the battery cell; a gap is formed between the corner part of the third shell and the periphery of the sleeve, so that a buffer space is provided for deformation of the corner part; a clamping structure is further included, the clamping structure comprises a first matching part arranged on the third shell and a second matching part arranged on the first shell and / or the second shell, the first matching part is connected with the second matching part in a clamped mode, movement of the third shell towards the first shell in the gap is limited, the deformation quantity of the third shell at the corner part is reduced, and the clamping structure is arranged on the third shell. Therefore, the battery cell is prevented from being damaged when the battery pack falls off, and the safety of the battery pack is ensured.

Description

TECHNICAL FIELD

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

[0002] With the development of science and technology, electric tools become an important kind of living supplies in human life. When the electric tools are used, the battery pack needs to support the power supply of the electric tools. In the prior art, the battery pack usually comprises a shell, a sleeve accommodated in the shell, and a battery cell accommodated in the sleeve. The shell and the sleeve provide protection for the battery cell. SUMMARY

[0003] In order to overcome the defects of the prior art, the embodiments of the present application provide a battery pack, which solves the problem that the battery cell is easily damaged when the battery pack is impacted, and increases the safety of the battery pack.

[0004] The present application provides a battery pack, which comprises:

[0005] at least one battery cell;

[0006] a first shell comprising at least one sleeve, the sleeve being enclosed to form an accommodation cavity, and each battery cell being at least partially accommodated in a corresponding accommodation cavity;

[0007] a second shell at least partially covering the first shell in the upward direction;

[0008] a third shell at least partially covering the sleeve in the axial direction of the battery cell;

[0009] The third shell comprises a peripheral wall covering at least part of the outer periphery of the sleeve, the peripheral wall comprising an upper wall located in the upward direction, a lower wall located opposite to the upper wall, a pair of side walls located between the upper wall and the lower wall, and a corner portion, the side walls being connected to the upper wall or the lower wall through the corner portion;

[0010] The inner surface of the corner portion and the outer periphery of the sleeve covered by the corner portion have a gap therebetween;

[0011] The battery pack further comprises a clamping structure, the clamping structure comprising a first fitting portion and a second fitting portion matched and clamped with the first fitting portion; the first fitting portion is protruded or recessed from the end surface of the peripheral wall facing the axial direction of the battery cell; the second fitting portion is arranged on the first shell and / or the second shell;

[0012] The clamping structure is configured to limit the movement of the third shell in the gap towards the first shell.

[0013] The battery pack provided in the application houses the battery cell in the sleeve of the first shell, the third shell covers both ends of the sleeve, and a gap is arranged between the sleeve and the corner part of the third shell to provide a buffer space for the deformation of the corner part; a clamping structure is also arranged to limit the movement of the third shell, reduce the deformation amount of the third shell at the corner part, prevent the battery cell from being damaged when the battery pack falls, and ensure the safety of the battery pack.

[0014] Optionally, the mechanical strength of the first fitting part and / or the second fitting part is lower than the mechanical strength of the third shell and / or the second shell and / or the first shell.

[0015] Optionally, the first shell and / or the second shell is provided with at least one supporting rib, and the second fitting part is arranged as a groove recessed on the supporting rib.

[0016] Optionally, the first fitting part or the second fitting part is arranged as a convex rib, and the wall thickness of the first fitting part is smaller than the wall thickness of the peripheral wall.

[0017] Optionally, the maximum distance of the gap is greater than or equal to 0.5 mm.

[0018] Optionally, the first fitting part is arranged on the corner part.

[0019] Optionally, the corner part includes an upper corner part connecting the side wall and the upper wall and a lower corner part connecting the side wall and the lower wall.

[0020] Optionally, the inner surface of the corner part matches at least part of the contour of the outer periphery of the sleeve covered by the corner part.

[0021] Optionally, the first fitting part and the second fitting part are arranged along at least part of the contour of the corner part.

[0022] Optionally, the upper wall and / or the lower wall has a second gap with the outer periphery of the sleeve covered by the upper wall and / or the lower wall; the battery pack further includes a stop structure configured to limit the movement of the third shell towards the first shell within the second gap, and the stop structure includes a third fitting part and a fourth fitting part matched with the third fitting part; the third fitting part is arranged protruding or recessed from the end surface of the upper wall and / or the lower wall in the axial direction towards the battery cell; and the fourth fitting part is arranged on the first shell and / or the second shell. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an explosion schematic diagram of the battery pack in the prior art;

[0024] Figure 2 It is a schematic diagram of the battery cell in the prior art;

[0025] Figure 3 It is a structural schematic diagram of the battery pack in an embodiment of the application;

[0026] Figure 4 Fig. 1 is a schematic view of a battery pack according to an embodiment of the present application; Figure 1

[0027] Figure 5 Fig. 4 is a schematic view of an explosion of the battery pack according to an embodiment of the present application;

[0028] Figure 6 Fig. 5 is a schematic view of a structure of a first housing according to an embodiment of the present application;

[0029] Figure 7 Fig. 6 is a schematic view of a structure of a second housing according to an embodiment of the present application; Figure 3 Fig. 7 is a schematic view of a cross-section along line A-A;

[0030] Figure 8 Fig. 8 is a schematic view of a detail in B of Fig. 7; Figure 6

[0031] Figure 9 Fig. 9 is a schematic view of a structure of a third housing according to an embodiment of the present application;

[0032] Figure 10 Fig. 10 is a schematic view of a detail in C of Fig. 9; Figure 8

[0033] Fig. 11 is a schematic view of a partial cross-section of the battery pack according to an embodiment of the present application; Figure 11

[0034] Fig. 12 is a schematic view of a detail in D of Fig. 11. Figure 12 DETAILED DESCRIPTION Figure 10 The present application will now be described in detail with reference to a few embodiments thereof as illustrated in the accompanying drawings. The present application may, however, be carried out in many different constructions and arrangements of parts, and thus the present application is not limited to the specific embodiments described herein. Rather, specific structural and functional details disclosed herein are merely representative for purposes of describing and disclosing the present application.

[0035] It is to be understood that the figures and descriptions of the present application are intended to be illustrative only and that changes can be made to the details (e.g., shape of parts, the relative positions of parts, the materials used, the shapes of the components, the sizes of the components, etc.) without departing from the scope of the application. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring the present application.

[0036] It is to be understood that the figures and descriptions of the present application are intended to be illustrative only and that changes can be made to the details (e.g., shape of parts, the relative positions of parts, the materials used, the shapes of the components, the sizes of the components, etc.) without departing from the scope of the application. In other instances, well-known structures and functions have not been described in detail in order to avoid obscuring the present application.

[0037] ​​​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0038] Referring to Figure 1 and Figure 2 In the prior art, a battery pack generally comprises a shell 90, a sleeve 91 received in the shell 90, and a battery cell 92 received in the sleeve 91, the shell 90 and the sleeve 91 provide protection for the battery cell 92. In order to ensure the compactness of the battery pack structure, the inner wall 901 of the shell 90 abuts against the openings at both ends of the sleeve 91 in the axial direction of the battery cell, so that the electrode ends 921 of the battery cell 92 are arranged at the corners 902 of the shell. However, the corners 902 of the shell 90 are prone to stress concentration and deformation or damage when falling or being impacted. Further, the battery cell 921 generally comprises a cylindrical steel can 921 and a rolled film received in the steel can 921; the edges 922 at the ends of the steel can 921 are fixed with the electrode cover 923 by welding or the like, so that the edges 922 of the steel can 921 are relatively weak and are prone to deformation when impacted, thereby impacting the rolled film inside the battery cell 92 and causing internal short circuit of the battery cell 92. However, when the battery pack falls, the force is generally borne by the corners 902 of the battery pack, causing the corners 902 of the shell to deform and be damaged, thereby impacting the edges 932 of the steel can of the battery cell and causing damage to the battery cell 92, which poses a safety risk.

[0039] Referring to Figures 3-5 The embodiments of the present application provide a battery pack, which comprises a first shell 1 and at least one battery cell 4 received in the first shell 1. Specifically, referring to Figure 5 and Figure 6 The first shell 1 comprises at least one sleeve 11, the sleeve 11 encloses a receiving cavity 112, and each battery cell 4 is at least partially received in a corresponding receiving cavity 112. In a specific embodiment, the battery pack can comprise a plurality of battery cells 4, the first shell 1 comprises a plurality of sleeves 11 arranged in sequence in the length direction, and the plurality of sleeves 11 are integrally formed. The battery cells 4 are sequentially received in the sleeves 11. The sleeves 11 have openings 111 at both ends, and each battery cell 4 is received in the receiving cavity 112 of each sleeve 11 through the opening 111. The opening 111 exposes the electrode ends 41 at both ends of the battery cell 4, and the electrode ends 41 of each battery cell are electrically connected to each other through the connecting sheet 5.

[0040] In some other embodiments, the sleeve can also comprise two sub-sleeves, and the two sub-sleeves are respectively sleeved at both ends of the battery cell. In another optional embodiment, the first shell can comprise a plurality of rows of sleeves, and the plurality of rows of sleeves are arranged in the height direction.

[0041] Referring to Figure 3 and Figure 4 The battery pack further comprises a second housing 2, which at least partially covers the upper surface of the first housing 1 along the upper direction.

[0042] Referring to Figure 4 In some embodiments, the battery pack comprises a battery pack interface 21 and a locking assembly 22, which are used for detachable connection with the power tool. Specifically, the battery pack interface 21 comprises a guide rail assembly 211 arranged on the second housing 2, which is used for pluggable mechanical connection with the power tool.

[0043] Referring to Figure 5 The battery pack further comprises a circuit board 6 arranged between the second housing 2 and the first housing 1, which is used for controlling the charging and discharging of the battery pack. The battery pack structure 21 further comprises power terminals 61 and signal terminals 62 arranged on the circuit board 6, which are used for electrical connection with the power tool.

[0044] Referring to Figures 3-5 The battery pack further comprises a third housing 3, which at least partially covers the sleeve 11 along the axial direction of the battery cell. It can be understood that the third housing can be arranged integrally with the first housing or the second housing, or can be arranged separately from the first housing and the second housing, as long as it can cover and protect the end of the sleeve.

[0045] Referring to Figure 4 and Figure 7 The third housing 3 comprises a peripheral wall 31 that at least partially covers the outer periphery of the sleeve 11.

[0046] Referring to Figure 5 and Figure 9 In some embodiments, the third housing 3 comprises two end covers 32 arranged opposite to each other along the width direction, which cover the openings 111 at the two ends of the sleeve 11, respectively. The edge of each end cover 32 extends along the width direction to form the peripheral wall 31, so that the third housing 3 covers the two ends of the sleeve 11. The end cover 32 further comprises a plurality of threaded holes 33, through which screws are used to fix the third housing 3 to the first housing 1 and / or the second housing 2.

[0047] A flexible gasket 7 is arranged between the third housing 3 and the sleeve opening 111, which abuts against the battery cell 4 and the connecting piece 5, preventing the battery cell 4 from moving along the axial direction. When the third housing 3 is impacted, the flexible gasket 7 can absorb the impact force, preventing the battery cell 4 from being damaged.

[0048] Referring to Figure 7 and Figure 9The peripheral wall 31 includes an upper wall 311 above the sleeve 11, a lower wall 312 opposite to the upper wall 311, a pair of side walls 313 between the upper wall 311 and the lower wall 312, and a corner portion 314, the side walls 313 connecting the upper wall 311 or the lower wall 312 through the corner portion 314, specifically, the upper wall 311 and the lower wall 312 cover the outer periphery of the sleeve 11 in the height direction, and the side walls 313 cover the outer periphery of the sleeve 11 in the length direction.

[0049] In the above Figures 3-7 , the X direction is the length direction, the Y direction is the width direction, and the Z direction is the height direction, wherein the length direction X, the width direction Y and the height direction Z are perpendicular to each other, the width direction Y is parallel to the axial direction of the battery cell, and the height direction Z includes opposite upper and lower directions.

[0050] Further referring to Figure 7 and Figure 8 , in a specific embodiment, the plurality of battery cells 4 are arranged in sequence, wherein the battery cell adjacent to both the side wall 313 and the upper wall 311 or the lower wall 312 is an edge battery cell 4', the edge battery cell 4' has a center W along the A-A line, an extension line L1 formed by the center W extending in the length direction X, and an extension line L2 formed by the center W extending in the height direction Z, and the area between the extension line L1 and the extension line L2 on the peripheral wall 31 is the corner portion 314. It can be understood that in some other embodiments, part of the area between the extension line L1 and the extension line L2 on the peripheral wall 31 is the corner portion, which can be specifically designed by those skilled in the art according to the situation.

[0051] Referring to Figure 11 and Figure 12 , the inner surface of the corner portion 314 and the outer periphery of the sleeve 11 covered by the corner portion 314 have a gap G1. When the corner portion 314 is impacted, the third shell 3 at the corner portion 314 deforms, and because there is a gap G1 between the sleeve 11 and the corner portion 314, the deformation of the corner portion 314 provides a buffer space, avoiding the third shell 3 from being extruded by the deformation of the sleeve 11 and the battery cell 4, ensuring the safety of the battery cell 4. The deformation amount of the shell with different strengths is different when it is impacted, and the size of the gap G1 can be determined according to the strength of the shell.

[0052] In an optional embodiment, the maximum distance of the gap G1 is greater than or equal to 0.5 mm to ensure sufficient buffer space. The inner surface of the corner portion 314 or the outer periphery of the sleeve 11 covered by the corner portion 314 can be a flat surface or a curved surface. When the inner surface of the corner portion 314 and the outer periphery of the sleeve 11 covered by the corner portion 314 are both flat surfaces, the distance of the gap G1 is equal at different positions. In this case, the maximum distance of the gap G1 should be understood as the distance between any position of the inner surface of the corner portion 314 and the corresponding outer periphery of the sleeve 11 covered by the corner portion 314. When the inner surface of the corner portion 314 and / or the outer periphery of the sleeve 11 covered by the corner portion 314 is a curved surface, the distance of the gap G1 is not equal at different positions. In this case, the maximum distance of the gap G1 should be understood as the maximum distance between the inner surface of the corner portion 314 and the corresponding outer periphery of the sleeve 11 covered by the corner portion 314.

[0053] In an embodiment, referring to Figure 7 , the corner portion 314 includes a lower corner portion 3141 connecting the side wall 313 and the lower wall 312, and a gap G1 exists between each lower corner portion 3141 and the sleeve 11. In this embodiment, a gap G1 exists between each of the four corner portions 314 of the bottom of the battery pack and the corresponding sleeve 11, thereby protecting each corner of the bottom of the battery pack. In other embodiments, the corner portion 314 includes an upper corner portion 3142 connecting the side wall 313 and the upper wall 311, and a gap G1 exists between each upper corner portion 3142 and the sleeve 11. In this embodiment, a gap G1 exists between each of the four corner portions 314 of the top of the battery pack and the corresponding sleeve 11, thereby protecting each corner of the top of the battery pack. In a specific embodiment, a gap G1 exists between each of the upper corner portions 3142 and the lower corner portions 3141 and the corresponding outer periphery of the sleeve 11. In this embodiment, a gap G1 exists between each of the eight corner portions 314 of the top and bottom of the battery pack and the sleeve 11, thereby protecting the battery pack from falling impact from multiple angles.

[0054] Referring to Figure 11 and Figure 12 , the battery pack further includes a clamping structure 8, which includes a first matching portion 81 and a second matching portion 82 matched with the first matching portion 81. The first matching portion 81 is protrudingly or recessingly arranged on the end surface of the peripheral wall 31 facing the axis direction of the battery cell 4. The second matching portion 82 is arranged on the first shell 1 and / or the second shell 2 corresponding to the first matching portion 81. The clamping structure 8 is configured to limit the movement of the third shell 3 towards the first shell 1 within the gap G1. When the battery pack is impacted, the third shell 3 disperses the force received by the clamping structure 8 to the first shell 1 and / or the second shell 2, thereby reducing the deformation of the third shell 3.

[0055] Specifically, the first matching part 81 is a protruding rib protruding on the end surface of the peripheral wall 31, and the second matching part 82 is a groove matching the protruding rib, which is recessed on the first shell 1 and / or the second shell 2. The protruding rib and the groove are matched with each other, and the impact force on the third shell 3 can be transmitted to the groove through the protruding rib, so that the impact force is dispersed to the first shell 1 and / or the second shell 2. It can be understood that the first matching part 81 can also be a groove recessed on the peripheral wall 31, and the second matching part 82 can also be a protruding rib protruding on the first shell 1 and / or the second shell 2.

[0056] In some embodiments, the clamping structure 8 is arranged corresponding to the gap G1 between at least one corner portion 314 and the sleeve 11. Specifically, the first matching part 81 is arranged on one of the corner portions 314, and the second matching part 82 is arranged on the first shell 1 and / or the second shell 2 corresponding to the first matching part 81. By the clamping structure 8, the deformation of the corner portion 314 is reduced, and by the buffer space provided by the gap G1, the sleeve 11 is prevented from being impacted, the edge 42 of the steel can of the battery cell is protected to the greatest extent, and the safety of the battery cell 4 is ensured.

[0057] In some embodiments, the clamping structure 8 can also be arranged corresponding to each upper corner portion 3142 and lower corner portion 3141. In an embodiment, the first matching part 81 includes a plurality of ribs or grooves, and each rib or groove is arranged on each upper corner portion 3142 and lower corner portion 3141, respectively. Correspondingly, the second matching part 82 includes a plurality of grooves or ribs, which are arranged on the corresponding second shell 2 and first shell 1, respectively, to protect each corner of the top and bottom of the battery pack. In other embodiments, the first matching part 81 includes a plurality of ribs or grooves, and the plurality of ribs or grooves are arranged corresponding to the same corner portion. Correspondingly, the second matching part 82 includes a plurality of grooves or ribs arranged on the corresponding first shell or second shell. In yet another embodiment, the first matching part 81 includes at least one rib and at least one groove arranged on the same corner portion, and the second matching part 82 includes at least one groove and at least one rib arranged on the corresponding first shell and / or second shell.

[0058] Further, the inner surface of the corner portion 314 matches the contour of the outer periphery of the sleeve 11 covered by the corner portion 314, so that the distance of the gap G1 is relatively uniform, and it is ensured that each point of the corner portion 314 can have sufficient buffer space with the sleeve 11 when impacted. In an embodiment, the first matching part 81 and the second matching part 82 are arranged along at least part of the contour of the corner portion 314, so that the clamping structure 8 can uniformly disperse the impact force on the corner portion 314. Specifically, referring to FIG. 6, the first matching part 81 and the second matching part 82 are arranged along the contour of the corner portion 314, so that the clamping structure 8 can uniformly disperse the impact force on the corner portion 314. Figure 10, one end of the first fitting part 81 extends towards the first direction S1, and the other end extends towards the second direction S2, the first direction S1 and the second direction S2 are perpendicular to the width direction Z; the included angle between the first direction S1 and the second direction S2 is α, where 90°≤α<180°. The extension lines of the two ends of the first fitting part 81 along the first direction S1 and the second direction S2 do not pass through the gap G1, when the corner part 314 is subjected to the impact force F, the clamping structure 8 disperses the impact force F along the first direction S1, the second direction S2 and the width direction Z, and the clamping structure 8 and the second shell 2 form a multi-point support for the third shell 3, reducing the deformation displacement of the third shell 3 towards the gap G1.

[0059] Reference Figures 5-6 And Figures 9-10 The mechanical strength of the first fitting part 81 and / or the second fitting part 82 is lower than that of the third shell 3 and / or the second shell 2 and / or the first shell 1, and when subjected to a larger impact force, the first fitting part 81 and / or the second fitting part 82 can be broken before other parts of the shell, thereby absorbing the impact force and reducing the deformation amount of the adjacent shell, thereby protecting the sleeve 11 and the battery cell 4 from being squeezed.

[0060] In some embodiments, at least one support rib 121 is provided on the first shell 1, and the mechanical strength of the support rib 121 relative to the first shell 1 is relatively low; when the battery pack falls, the support rib 121 is impacted, and when the impact force is large, the support rib 121 can be broken to absorb the impact force, thereby protecting the lower corner part 3141 at the bottom of the battery pack. It can be understood that the second shell 2 can also be provided with a support rib corresponding to the upper corner part 3142, and the mechanical strength of the support rib on the second shell relative to the second shell is relatively low, thereby protecting the upper corner part 3142 of the battery pack.

[0061] In some embodiments, a plurality of support ribs 121 are arranged at intervals along the width direction, and the second fitting part 82 is a groove recessed on one of the support ribs 121, the groove reduces the thickness of the support rib 121, so that the mechanical strength of the support rib 121 at the groove is reduced. In an embodiment, referring to Figure 6 The area of the first shell 1 not covered by the second shell 2 and the third shell 3 is extended and provided with a support rib 121, and a plurality of support ribs 121 arranged at intervals increase the heat dissipation area of the first shell 1, so that the heat of the battery cell 4 can be transmitted to the support rib 121 through the sleeve 11, thereby improving the cooling effect of the battery pack.

[0062] In some embodiments, referring to Figure 9 And Figure 10, the first fitting part 81 is a convex rib, the wall thickness of the convex rib is less than the wall thickness of the circumferential wall 31, so that the mechanical strength of the convex rib is lower than the adjacent circumferential wall 31. When the battery pack falls, the first fitting part 81 can be broken to absorb the impact force, thereby reducing the deformation of other parts of the third shell 3, achieving the effect of protecting the battery cell 4. In other embodiments, the first fitting part can be a groove recessed on the circumferential wall, and the second fitting part can be a convex rib protruding on the first shell and / or the second shell, the mechanical strength of the convex rib is less than other parts of the adjacent shell, and when subjected to a larger impact force, the convex rib breaks in advance to absorb the impact force.

[0063] Reference Figures 2-11 , the battery pack includes at least one battery cell 4; a first shell 1 including at least one sleeve 11, the sleeve 11 forming a receiving cavity, each battery cell 4 is at least partially received in a corresponding receiving cavity; a second shell 2 at least partially covering the first shell 1 in the upward direction; a third shell 3 at least partially covering the sleeve 11 in the axial direction of the battery cell 4; the third shell 3 includes a circumferential wall 31 covering at least part of the outer circumference of the sleeve 11, the circumferential wall 31 includes an upper wall 311 located upward, a lower wall 312 located opposite to the upper wall 311, a pair of side walls 313 located between the upper wall 311 and the lower wall 312, and a corner portion 314, the side wall 313 is connected to the upper wall 311 or the lower wall 312 through the corner portion 314; the inner surface of the corner portion 314 and the outer circumference of the sleeve 11 covered by the corner portion 314 have a gap G1; the battery pack further includes a clamping structure 8, the clamping structure 8 includes a first fitting part 81 and a second fitting part 82 matched with the first fitting part 81; the first fitting part 81 is protruding or recessed from the end surface of the circumferential wall 31 facing the axial direction of the battery cell 4; the second fitting part is provided on the first shell 1 and / or the second shell 2; the clamping structure 8 is configured to limit the movement of the third shell towards the first shell in the gap.

[0064] When the battery pack falls, the corner portion 314 is deformed by impact, and the gap G1 provided between the sleeve 11 and the corner portion 314 provides a buffer space for the deformation of the corner portion 314, avoiding direct impact on the sleeve 11 and the steel tank edge of the battery cell 4; and the clamping structure 8 limits the movement of the third shell 3 in the gap G1, reducing the deformation amount of the third shell 3 at the corner portion 314, further preventing the steel tank edge of the battery cell 4 from being damaged when the battery pack falls, avoiding internal short circuit of the battery cell 4, and ensuring the safety of the battery pack.

[0065] In some embodiments, referring to Figure 5 and Figure 6The area of the first shell 1 not covered by the second shell 2 and the third shell 3 extends outward to form a support portion 12, which constitutes part of the outer wall of the battery pack. This arrangement allows the first shell to form part of the outer shell of the battery pack, eliminating the need for an additional lower shell and reducing the weight of the battery pack.

[0066] In an optional embodiment, the support portion 12 is composed of a plurality of spaced support ribs 121, or the support ribs 121 are formed by the outward extension of part of the support portion 12. At least part of the peripheral wall 31 abuts the support portion 12 of the first shell 1 in the width direction, and the second engagement portion 82 is provided on at least the support portion 12, while the first engagement portion 81 is correspondingly provided on the lower corner portion 3141. The impact force on the lower corner portion is transmitted to the support portion 12 through the clamping structure 8, avoiding stress on the sleeve 11. In some embodiments, at least part of the peripheral wall 31 abuts the second shell 2 in the width direction, and the second engagement portion 82 is provided on at least the second shell 2, while the first engagement portion 81 is correspondingly provided on the upper corner portion 3142. The impact force on the upper corner portion 3142 is transmitted to the second shell 2 through the clamping structure 8, avoiding stress on the sleeve 11.

[0067] In some embodiments, referring to Figure 7 and Figure 9 , the upper wall 311 and / or the lower wall 312 of the peripheral wall 31 has a second gap G2 between the outer periphery of the sleeve 11 covered by the upper wall 311 and / or the lower wall 312; the battery pack further comprises a stop structure 80 configured to limit the movement of the third shell 3 towards the first shell 1 within the second gap G2.

[0068] In particular, referring to Figure 6 and Figure 9 , the stop structure 80 comprises a third engagement portion 83 and a fourth engagement portion 84 that cooperatively engages with the third engagement portion 83; the third engagement portion 83 is protrudingly or recessedly arranged from the end surface of the upper wall 311 and / or the lower wall 312 in the axial direction towards the battery cell 4, and the fourth engagement portion 84 is correspondingly arranged on the first shell 1 and / or the second shell 2. The stop structure 80 can prevent the third shell 3 from deforming and displacing in the height direction Z towards the sleeve 11, thereby providing protection for the corresponding edges of the battery pack.

[0069] In an optional embodiment, the peripheral wall 31 is in contact with the sleeve 11, and the gap G1 and the second gap G2 are continuous with each other. Accordingly, the clamping structure 8 and the stop structure 80 can be continuously arranged to provide protection for the edges and corners of the battery pack.

[0070] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description. The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A battery pack, characterized by, The battery pack comprises: at least one cell (4); a first casing (1) comprising at least one sleeve (11) which delimits a housing cavity (112), each cell (4) being at least partially housed in a corresponding housing cavity (112); a second casing (2) which at least partially covers the first casing (1) from above; a third casing (3) which at least partially covers the sleeve (11) along the axial direction of the cell (4); the third casing (3) comprises a peripheral wall (31) which covers at least part of the periphery of the sleeve (11), the peripheral wall (31) comprising an upper wall (311) located from above and a lower wall (312) located opposite the upper wall (311), a pair of side walls (313) located between the upper wall (311) and the lower wall (312), and a corner portion (314) connecting the upper wall (311) or the lower wall (312) to the side walls (313); the inner surface of the corner portion (314) and the periphery of the sleeve (11) covered by the corner portion (314) have a gap (G1) therebetween; the battery pack further comprises a clamping structure (8) comprising a first fitting portion (81) and a second fitting portion (82) which is fitted and clamped to the first fitting portion (81); the first fitting portion (81) is protruding or recessed from the end surface of the peripheral wall (31) facing the axial direction of the cell (4); the second fitting portion (82) is provided on the first casing (1) and / or the second casing (2); the clamping structure (8) is configured to limit the movement of the third casing (3) towards the first casing (1) within the gap (G1).

2. The battery pack of claim 1, wherein, The mechanical strength of the first fitting portion (81) and / or the second fitting portion (82) is lower than the mechanical strength of the third casing (3) and / or the second casing (2) and / or the first casing (1).

3. The battery pack of claim 2, wherein, The first casing (1) and / or the second casing (2) is provided with at least one support rib (121), and the second fitting portion (82) is provided as a groove recessed on the support rib.

4. The battery pack of claim 2, wherein, The first fitting portion (81) or the second fitting portion (82) is provided as a convex rib, and the wall thickness of the first fitting portion (81) is smaller than the wall thickness of the peripheral wall (31).

5. The battery pack of claim 1, wherein, The maximum distance of the gap (G1) is greater than or equal to 0.5 mm.

6. The battery pack of any one of claims 1-5, wherein, The first fitting portion (81) is provided on the corner portion (314).

7. The battery pack of claim 6, wherein, The corner portion (314) comprises an upper corner portion (3142) connecting the side wall (313) and the upper wall (311), and a lower corner portion (3141) connecting the side wall (313) and the lower wall (312).

8. The battery pack of claim 6, wherein, The inner surface of the corner portion (314) matches at least part of the profile of the periphery of the sleeve (11) covered by the corner portion (314).

9. The battery pack of claim 6, wherein, The first fitting portion (81) and the second fitting portion (82) are provided along at least part of the profile of the corner portion (314).

10. The battery pack of claim 1, wherein, The upper wall (311) and / or the lower wall (312) has a second gap (G2) between the outer periphery of the sleeve (11) covered by the upper wall (311) and / or the lower wall (312); the battery pack further comprises a stop structure (80) configured to limit the movement of the third shell (3) towards the first shell (1) within the second gap (G2), the stop structure (80) comprises a third matching part (83), and a fourth matching part (84) matched and clamped with the third matching part (83); The third matching part (83) is protruding or recessed from the end surface of the upper wall (311) and / or the lower wall (312) in the axial direction towards the battery cell (4); the fourth matching part (84) is arranged on the first shell (1) and / or the second shell (2).

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