Output pole base, battery pack and vehicle

Abstract

The invention discloses an output pole base, a battery pack and a vehicle, the output pole base is used for being connected with a structural member, the structural member is a box beam or a module end plate, the output pole base comprises a base body and a connecting piece, and the base body comprises a fixing part used for being connected with an output pole connecting piece; the connecting piece is arranged at the bottom of the base body and connected with the base body. The connecting piece comprises a connecting part which is used for being connected with the structural piece and can move in the preset direction relative to the structural piece. Wherein the preset direction is consistent with the width direction of the structural member. According to the output pole base, the risk of connection failure such as breakage of the joint of the output pole connecting piece and the battery cell can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to an output pole base, a battery pack and a vehicle. Background Art

[0002] In a battery pack, the output pole base is usually fixed on a structural member (such as a box beam or a module end plate) to connect with the output pole connecting piece of the battery cell. After the battery pack is used for a long time, the battery cell is prone to expansion. The deformed battery cell squeezes the structural member, causing the structural member to deform, causing the output pole base fixed on the structural member to shift relative to the battery cell. The structural member exerts a pulling force on the output pole connecting piece, causing the output pole connecting piece and the battery cell to break easily, resulting in connection failures such as breakage. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the present invention proposes an output pole base to reduce the risk of connection failure such as breakage at the connection between the output pole connecting piece and the battery cell.

[0005] The output pole base of the present invention is used to connect with a structural member, and the structural member is a box beam or a module end plate. The output pole base includes a base body and a connecting member. The base body includes a fixing portion for connecting to the output pole connecting plate; the connecting member is arranged at the bottom of the base body and connected to the base body, and the connecting member includes a connecting portion for connecting to the structural member and movable relative to the structural member along a preset direction; wherein the preset direction is consistent with the width direction of the structural member.

[0006] Optionally, the output pole base further includes a guide member, which is disposed at the bottom of the base body and connected to the base body, and includes a guide portion for guiding and cooperating with the structural member and movable relative to the structural member along the preset direction.

[0007] Optionally, the guide portion is a guide groove extending along the preset direction, and a notch of the guide groove is arranged to face away from the base body.

[0008] Optionally, the guide member further includes a guide groove extending along the preset direction, the guide groove is arranged on a side of the guide groove away from the base body and is connected to the guide groove, and the width of the guide groove gradually decreases in a direction approaching the guide groove.

[0009] Optionally, there are multiple connecting members, and the multiple connecting members are arranged on opposite sides of the base body in the preset direction. The connecting members include a first connecting arm and a clamping protrusion. The first connecting arm can be elastically deformed along the preset direction, and one end of the first connecting arm is connected to the base body; the clamping protrusion is arranged on one side of the first connecting arm protruding in the preset direction and connected to the other end of the first connecting arm, and the clamping protrusion is used to clamp with the clamping hole of the structural member, and the clamping protrusion forms the connecting portion.

[0010] Optionally, the connecting member is an undercut structure extending along the preset direction, and the connecting member is used to be engaged with the engaging hole of the structural member.

[0011] Optionally, the output pole base further includes a limiting member, which is disposed at the bottom of the base body and connected to the base body, and the limiting member has a limiting portion for elastically stopping against the structural member along the preset direction.

[0012] Optionally, the limiting member includes a second connecting arm and a limiting protrusion, the second connecting arm can be elastically deformed along the preset direction, one end of the second connecting arm is connected to the base body; the limiting protrusion is arranged on one side of the second connecting arm protruding in the preset direction and is connected to the other end of the second connecting arm, the limiting protrusion is used to elastically stop the structural member along the preset direction, and the limiting protrusion forms the limiting portion.

[0013] The invention also provides a battery pack.

[0014] The battery pack of the present invention comprises a structural member, an output pole base, a battery cell and an output pole connecting plate, wherein the structural member is a box beam or a module end plate; the output pole base is the output pole base described in any one of the above items, and the connecting portion is movably connected to the structural member along the preset direction; one end of the output pole connecting plate is connected to the pole ear of the battery cell, and the other end of the output pole connecting plate is connected to the connecting portion.

[0015] The present invention also provides a vehicle.

[0016] The vehicle of the present invention includes the battery pack described in any one of the above items.

[0017] The output pole base of the embodiment of the present invention is connected to the structural member (box beam or module end plate) by the connecting part of the connecting member, and is connected to the output pole connecting piece by the fixing part of the base body. When the battery cell connected to the output pole connecting piece expands and the battery cell squeezes the structural member to cause the structural member to deform, the connecting part is used to move relative to the structural member in the deformation direction away from the structural member, so that the output pole base moves relative to the structural member in the deformation direction away from the structural member, thereby avoiding displacement of the output pole base relative to the battery cell, and further avoiding the structural member from generating tension on the output pole connecting piece, thereby reducing the risk of connection failure such as fracture at the connection between the output pole connecting piece and the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of an output pole base according to an embodiment of the present invention.

[0019] Figure 2 It is a stereoscopic diagram of an output pole base from another perspective of an embodiment of the present invention.

[0020] Figure 3 It is a structural schematic diagram of the assembly process of the output pole base and structural parts of an embodiment of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the connection between the output pole base and the structural member in one embodiment of the present invention.

[0022] Figure 5 It is a structural schematic diagram of the assembly process of the output pole base and the output pole connecting piece according to an embodiment of the present invention.

[0023] Figure 6 It is a structural schematic diagram of an output pole base, an output pole connecting piece and a battery cell assembly process according to an embodiment of the present invention.

[0024] Figure 7 It is a structural schematic diagram of the connection between the output pole base, the output pole connecting plate and the battery cell according to an embodiment of the present invention.

[0025] Figure 8 yes Figure 7 Schematic diagram of the structure of the battery cell before expansion.

[0026] Fig. 9 yes Figure 7 Schematic diagram of the structure of the battery cell after expansion.

[0027] Fig.10 It is a three-dimensional diagram of an output pole base according to another embodiment of the present invention.

[0028] Fig.11 It is a stereoscopic diagram of an output pole base from another perspective according to another embodiment of the present invention.

[0029] Fig.12 It is a schematic diagram of the structure of a structural member connected to an output pole base of another embodiment of the present invention.

[0030] Fig.13 It is a structural schematic diagram of the assembly process of the output pole base and structural parts of another embodiment of the present invention.

[0031] Fig.14 It is a schematic structural diagram of the connection between the output pole base and the structural member in another embodiment of the present invention.

[0032] Reference numerals:

[0033] 10. Output pole base;

[0034] 1. Base body; 11. Fixing part; 12. Injection molded part;

[0035] 2. Connecting piece; 21. Connecting portion; 22. First connecting arm; 23. Clamping protrusion;

[0036] 3. guide member; 31. guide portion; 32. guide groove;

[0037] 4. Limiting member; 41. Limiting portion; 42. Second connecting arm; 43. Limiting protrusion;

[0038] 20, structural member; 201, snap-in hole; 202, connecting plate; 203, inner wall; 204, outer wall;

[0039] 30. Output pole connecting piece; 301. Fixing hole; 302. Welding hole;

[0040] 40. Battery cell; 401. Tab. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0042] The output pole base of the embodiment of the present invention is used to connect with a structural member, and the structural member is a box beam or a module end plate. Figure 1 , Figure 2 , Fig.10 and Fig.11 As shown, the output pole base 10 of the embodiment of the present invention includes a base body 1 and a connecting member 2, wherein the connecting member 2 is disposed at the bottom of the base body 1 and connected to the base body 1. The base body 1 includes a fixing portion 11, and the connecting member 2 includes a connecting portion 21. Figures 3 to 8 , Fig.10 and Fig.14As shown, the fixing portion 11 is used to connect with the output pole connecting piece 30 , and the connecting portion 21 is used to connect with the structural member 20 and can move relative to the structural member 20 along a preset direction. The preset direction is consistent with the width direction of the structural member 20 .

[0043] The output pole base 10 of the embodiment of the present invention is connected to the structural member 20 (box beam or module end plate) by the connecting portion 21 of the connecting member 2, and is connected to the output pole connecting piece 30 by the fixing portion 11 of the base body 1. When the battery cell 40 connected to the output pole connecting piece 30 expands, the battery cell 40 squeezes the structural member 20 to cause the structural member 20 to deform, and the connecting portion 21 is used to move relative to the structural member 20 in the deformation direction opposite to the structural member, so that the output pole base 10 moves relative to the structural member 20 in the deformation direction opposite to the structural member, thereby avoiding displacement of the output pole base 10 relative to the battery cell 40, and further avoiding the structural member 20 from generating tension on the output pole connecting piece 30, thereby reducing the risk of connection failure such as fracture at the connection between the output pole connecting piece 30 and the battery cell 40.

[0044] In order to make the technical solution of the present invention easier to understand, the following takes the preset direction being consistent with the front-to-back direction, that is, the width direction of the structural member 20 being consistent with the front-to-back direction as an example to further describe the technical solution of the present application. Figures 1 to 14 shown.

[0045] For example, Figures 1 to 14 As shown, the structural member 20 includes an inner wall 203 and an outer wall 204, and the outer wall 204 is arranged on the front side of the inner wall 203. Figures 6 to 9 As shown, the battery cell 40 is arranged at the rear side of the inner side wall 203. When the battery cell 40 expands, the battery cell 40 presses the structural member 20 forward. At this time, the output pole base 10 can be moved backward relative to the structural member 20, so as to avoid displacement of the output pole base 10 relative to the battery cell 40 in the front-to-back direction, thereby preventing the structural member 20 from generating a pulling force on the output pole connecting sheet 30.

[0046] When the output pole base 10 is connected to the structural member 20, a gap L1 (such as Figure 8 As shown in FIG. 2 , when the battery cell 40 expands and presses the structural member 20 forward, the gap L1 can provide space for the output pole base 10 to move backward relative to the structural member 20. After the output pole base 10 moves backward relative to the structural member 20, a gap L2 (as shown in FIG. 2 ) is formed between the front side of the output pole base 10 and the outer side wall 204. Fig. 9 As shown). Among them, the gap L2 is less than or equal to the gap L1.

[0047] In some embodiments, Figure 1 , Figure 2 , Fig.11and Fig.12 As shown, the output pole base 10 further includes a guide member 3, which is disposed at the bottom of the base body 1 and connected to the base body 1. The guide member 3 includes a guide portion 31, which is used to guide and cooperate with the structural member 20 and is movable relative to the structural member 20 along a preset direction.

[0048] For example, Figure 3 , Figure 4 , Fig.12 , Fig.13 and Fig.14 As shown, the structural member 20 includes a connecting plate 202, and the front and rear ends of the connecting plate 202 are respectively connected to the outer wall 204 and the inner wall 203. The guide portion 31 guides and cooperates with the connecting plate 202 of the structural member 20. The connecting plate 202 can be formed by one of the ribs of the structural member 20, that is, the connecting plate 202 plays the role of a guide rail and also plays the role of reinforcing the structural member 20.

[0049] Therefore, when the output pole base 10 moves relative to the structural member 20, the guide portion 31 cooperates with the structural member 20 to guide the output pole base 10 to move in a preset direction, thereby preventing the moving direction of the output pole base 10 from deviating and causing the output pole base 10 to generate a pulling force on the output pole connecting plate 30, thereby further reducing the risk of connection failure such as breakage at the connection between the output pole connecting plate 30 and the battery cell 40.

[0050] Alternatively, if Figure 2 and Figure 3 As shown, the guide portion 31 is a guide groove extending along a preset direction, and the notch of the guide groove is arranged to face away from the base body 1 .

[0051] By configuring the guide portion 31 as a guide groove, the structure of the guide portion 31 is simplified, and the processing and manufacturing of the guide member 3 is facilitated, thereby facilitating the processing and manufacturing of the output pole base 10 .

[0052] In order to make the technical solution of the present invention easier to understand, the technical solution of the present application is further described below by taking the case that the height direction of the structural member 20 is consistent with the up-down direction. Figures 1 to 14 shown.

[0053] For example, Figure 2 and Figure 3 As shown, the guide member 3 is arranged on the lower side of the base body 1, the notch of the guide groove faces downward, and the output pole base 10 moves relative to the structural member 20 along the top-down direction, so that the connecting plate 202 of the structural member 20 is inserted into the guide groove through the notch of the guide groove.

[0054] Alternatively, if Figure 2 and Figure 3As shown, the guide member 3 further includes a guide groove 32 extending along a preset direction, the guide groove 32 is arranged on a side of the guide groove away from the base body 1 and communicates with the guide groove. The width of the guide groove 32 gradually decreases in a direction close to the guide groove.

[0055] For example, Figure 2 and Figure 3 As shown, the guide groove 32 is arranged at the lower side of the guide groove, and the width of the guide groove 32 gradually increases from bottom to top, so that the slot width of the guide groove 32 is relatively large, and the width of the portion of the guide groove 32 closer to the guide groove is larger, so that the connecting plate 202 of the structural member 20 first passes through the slot of the guide groove 32, and then is inserted into the guide groove through the slot of the guide groove under the guidance of the guide groove 32.

[0056] The design of the guide groove 32 facilitates the assembly of the guide groove and the structural member 20 , thereby facilitating the improvement of the assembly efficiency of the output pole base 10 and the reduction of the assembly cost of the output pole base 10 .

[0057] In some embodiments, Figure 1 and Figure 2 As shown, there are multiple connecting members 2, and the multiple connecting members 2 are arranged on opposite sides of the base body 1 in a preset direction. The connecting member 2 includes a first connecting arm 22 and a clamping protrusion 23, and the first connecting arm 22 can be elastically deformed along the preset direction. One end of the first connecting arm 22 is connected to the base body 1, and the clamping protrusion 23 is arranged to protrude from one side of the first connecting arm 22 in the preset direction and is connected to the other end of the first connecting arm 22. Figure 3 As shown, the structural member 20 is provided with a snap-in hole 201. Figures 4 to 8 As shown, the clamping protrusion 23 is used to clamp with the clamping hole 201 of the structural member 20, and the clamping protrusion 23 forms the connecting portion 21. The clamping protrusion 23 and the clamping hole 201 are clearance-matched, so that the clamping protrusion 23 can move relative to the clamping hole 201 along a preset direction.

[0058] For example, there are four connectors 2, two of which are arranged at the front side of the other two connectors 2, and the inner side wall 203 and the outer side wall 204 are respectively provided with two snap-in holes 201, and the two connectors 2 arranged at the front side correspond to and snap-in with the two snap-in holes 201 arranged at the outer side wall 204; the two connectors 2 arranged at the rear side correspond to and snap-in with the two snap-in holes 201 arranged at the inner side wall 203. When the output pole base 10 moves from top to bottom to the structural member 20, the connector 2 arranged at the front side is squeezed by the outer side wall 204 of the structural member 20, and the connector 2 arranged at the rear side is squeezed by the inner side wall 203 of the structural member 20, the first connecting arm 22 is elastically deformed, and the output pole base 10 continues to move from top to bottom until the snap-in protrusion 23 is aligned with the corresponding snap-in hole 201, and the first connecting arm 22 is elastically reset, so that the snap-in protrusion 23 is snap-in with the corresponding snap-in hole 201.

[0059] By setting the connecting member 2 to the above structure, the structure of the connecting member 2 is simplified, and the processing and manufacturing of the connecting member 2 is convenient, thereby facilitating the processing and manufacturing of the output pole base 10.

[0060] Optionally, the clamping protrusion 23 is cylindrical, and the clamping hole 201 is a circular hole.

[0061] Optionally, a plurality of connecting members 2 are arranged on opposite sides of the guide member 3 in the length direction of the structural member 20 .

[0062] In order to make the technical solution of the present invention easier to understand, the technical solution of the present application is further described below by taking the case that the length direction of the structural member 20 is consistent with the left-right direction. Figures 1 to 14 shown.

[0063] For example, the number of the connecting members 2 is four, two of which are arranged on the left side of the guiding member 3 , and the other two connecting members 2 are arranged on the right side of the guiding member 3 .

[0064] By arranging a plurality of connecting members 2 on opposite sides of the guide member 3 in the length direction of the structural member 20 , it is beneficial to improve the connection stability between the output pole base 10 and the structural member 20 .

[0065] In other embodiments, Figures 11 to 14 As shown, the connecting member 2 is an inverted structure extending along a preset direction, and the structural member 20 is provided with a snap-fitting hole 201 . The connecting member 2 is used to snap-fit ​​with the snap-fitting hole 201 of the structural member 20 .

[0066] By providing the connecting member 2 with a barbed structure, the structure of the connecting member 2 is simplified, and the processing and manufacturing of the connecting member 2 is facilitated, thereby facilitating the processing and manufacturing of the output pole base 10 .

[0067] Alternatively, if Fig.11As shown, there are multiple guide members 3, and the multiple guide members 3 are arranged on opposite sides of the connecting member 2 in a preset direction.

[0068] For example, the number of the guide members 3 is two, one of which is arranged at the front side of the connecting member 2 , and the other guide member 3 is arranged at the rear side of the connecting member 2 .

[0069] By arranging multiple guide members 3 on opposite sides of the connector 2 in a preset direction, the movement of the output pole base 10 can be better guided, effectively preventing the movement direction of the output pole base 10 from deviating, and further reducing the risk of connection failure such as breakage at the connection between the output pole connecting sheet 30 and the battery cell 40.

[0070] Alternatively, if Fig.11 As shown, the output pole base 10 further includes a stopper 4, which is disposed at the bottom of the base body 1 and connected to the base body 1. The stopper 4 has a stopper portion 41 for elastically stopping against the structural member 20 along a preset direction.

[0071] For example, Fig.13 and Fig.14 As shown, the limiting portion 41 elastically stops at the inner wall 203 along a preset direction, ensuring that there is a gap between the rear side of the output pole base 10 and the inner wall 203 when the output pole base 10 is connected to the structural member 20 .

[0072] Therefore, when the battery cell 40 expands and squeezes the structural member 20 causing the structural member 20 to deform, it is ensured that there is space between the output pole base 10 and the structural member 20 for the output pole base 10 to move, further reducing the risk of connection failure such as breakage at the connection between the output pole connecting plate 30 and the battery cell 40.

[0073] Of course, in other embodiments, the limiting member 4 may not be provided on the output pole base 10. In this case, the relative position of the output pole connecting piece 30 and the structural member 20 can be designed to ensure that there is space for the output pole base 10 to move between the output pole base 10 and the side wall of the structural member 20.

[0074] For example, Figures 5 to 9 As shown, the fixing portion 11 includes a threaded hole, and the output pole connecting piece 30 includes a fixing hole 301 and a welding hole 302. The fixing hole 301 is aligned with the threaded hole and connected by bolts, and the welding hole 302 is aligned with the pole ear 401 of the battery cell 40 and welded. When the output pole connecting piece 30 is connected to the output pole base 10, the fixing hole 301 is arranged toward the outer side wall 204, so that after the fixing hole 301 is connected to the fixing portion 11, there is a gap between the output pole base 10 and the inner side wall 203.

[0075] Alternatively, if Fig.11As shown, the limiting member 4 includes a second connecting arm 42 and a limiting protrusion 43. The second connecting arm 42 can be elastically deformed along a preset direction. One end of the second connecting arm 42 is connected to the base body 1, and the limiting protrusion 43 is arranged to protrude from one side of the second connecting arm 42 in the preset direction and is connected to the other end of the second connecting arm 42. The limiting protrusion 43 is used to elastically stop at the structural member 20 along the preset direction, and the limiting protrusion 43 forms a limiting portion 41.

[0076] When the output pole base 10 moves from top to bottom to the structure 20 , the limiting protrusion 43 of the limiting member 4 is squeezed by the inner wall 203 of the structure 20 , and the second connecting arm 42 is elastically deformed to ensure a gap between the base body 1 and the inner wall 203 .

[0077] The position limiting member 4 is configured as the above structure, which facilitates the cooperation between the position limiting member 4 and the structural member 20 , thereby further facilitating the assembly of the output pole base 10 and the structural member 20 , and is beneficial to improving the installation efficiency of the output pole base 10 .

[0078] Optionally, the base body 1 includes an injection molded part 12 and a metal insert, wherein the metal insert is embedded in the injection molded part 12, and the metal insert forms the fixing portion 11. The metal insert may be a metal nut.

[0079] Optionally, the base body 1, the connecting member 2, the guiding member 3 and the limiting member 4 are integrally injection molded.

[0080] like Figures 3 to 9 , Figures 11 to 14 As shown, the battery pack of the embodiment of the present invention includes a structural member 20, an output pole base 10, a battery cell 40 and an output pole connecting piece 30, wherein the structural member 20 is a box beam or a module end plate. The output pole base 10 is the output pole base 10 of any of the above embodiments, and the connecting portion 21 is movably connected to the structural member 20 along a preset direction. One end of the output pole connecting piece 30 is connected to the pole ear 401 of the battery cell 40, and the other end of the output pole connecting piece 30 is connected to the fixing portion 11.

[0081] Since the output pole base 10 in the above embodiment can reduce the risk of connection failure such as breakage at the connection between the output pole connecting piece 30 and the battery cell 40, the battery pack of the embodiment of the present invention has the advantages of good reliability.

[0082] The battery pack of the embodiment of the present invention is configured such that the output pole base 10 is movably connected to the box beam or the module end plate so that, when the battery pack is used for a long time and the battery cell 40 expands and the box beam or the module end plate is squeezed and deformed by the battery cell 40, the output pole base 10 is moved along the width direction of the box beam or the module end plate to avoid displacement of the output pole base 10 relative to the battery cell 40, thereby preventing tension from being generated on the output pole connecting piece 30. The output pole connecting piece 30 also does not generate tension on the welding position of the pole ear 401 of the battery cell 40, thereby ensuring the reliability of the welding connection between the output pole connecting piece 30 and the pole ear 401 of the battery cell 40.

[0083] The vehicle according to the embodiment of the present invention includes the battery pack described in any of the above embodiments.

[0084] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An output pole base, characterized in that: Used to connect with a structural member, the structural member is a box beam or a module end plate, the output pole base includes: A base body, the base body comprising a fixing portion for connecting to the output pole connecting piece; A connecting member, the connecting member is disposed at the bottom of the base body and connected to the base body, the connecting member includes a connecting portion for connecting to the structural member and movable relative to the structural member along a preset direction; Wherein, the preset direction is consistent with the width direction of the structural member.

2. The output pole base according to claim 1, characterized in that: The output pole base also includes a guide member, which is arranged at the bottom of the base body and connected to the base body. The guide member includes a guide portion for guiding and cooperating with the structural member and movable relative to the structural member along the preset direction.

3. The output pole base according to claim 2, characterized in that: The guide portion is a guide groove extending along the preset direction, and the notch of the guide groove is arranged to face away from the base body.

4. The output pole base according to claim 3, characterized in that: The guide member further comprises a guide groove extending along the preset direction, the guide groove is arranged on a side of the guide groove away from the base body and is connected with the guide groove, and the width of the guide groove gradually decreases along a direction approaching the guide groove.

5. The output pole base according to any one of claims 1 to 4, characterized in that: There are multiple connecting members, and the multiple connecting members are arranged on opposite sides of the base body in the preset direction. The connecting members include: A first connecting arm, the first connecting arm can be elastically deformed along the preset direction, and one end of the first connecting arm is connected to the base body; A snap-fitting protrusion, which protrudes from one side of the first connecting arm in the preset direction and is connected to the other end of the first connecting arm. The snap-fitting protrusion is used to snap-fit ​​with the snap-fitting hole of the structural member, and the snap-fitting protrusion forms the connecting portion.

6. The output pole base according to any one of claims 1 to 4, characterized in that: The connecting member is an undercut structure extending along the preset direction, and the connecting member is used for being engaged with the engaging hole of the structural member.

7. The output pole base according to any one of claims 1 to 4, characterized in that: The output pole base further includes a limiting member, which is disposed at the bottom of the base body and connected to the base body, and has a limiting portion for elastically abutting against the structural member along the preset direction.

8. The output pole base according to claim 7, characterized in that: The limiting member comprises: a second connecting arm, the second connecting arm being capable of elastically deforming along the preset direction, one end of the second connecting arm being connected to the base body; A limiting protrusion, the limiting protrusion is arranged on one side of the second connecting arm protruding in the preset direction and is connected to the other end of the second connecting arm, the limiting protrusion is used to elastically stop against the structural member along the preset direction, and the limiting protrusion forms the limiting portion.

9. A battery pack, characterized in that: include: Structural member, wherein the structural member is a box beam or a module end plate; An output pole base, wherein the output pole base is the output pole base according to any one of claims 1 to 8, and the connecting portion is movably connected to the structural member along the preset direction; A battery cell and an output pole connecting piece, wherein one end of the output pole connecting piece is connected to the pole ear of the battery cell, and the other end of the output pole connecting piece is connected to the fixing portion.

10. A vehicle, characterized in that: A battery pack comprising the battery pack of claim 9.

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