CN219717153U - Battery pack - Google Patents

Abstract

The embodiment of the utility model provides a battery pack, and relates to the technical field of batteries. Including mount, bottom plate, curb plate, battery cell, busbar and/or pencil, the curb plate encloses into the cavity that is used for holding battery cell, the busbar with battery cell electric connection, the mount includes supporting seat and fixing base, the supporting seat includes along the relative first end and the second end that sets up of first direction, first end is used for connecting on the bottom plate, fixing base detachably connects the second end of supporting seat, the fixing base be used for with busbar and/or pencil detachably connect in order will busbar and/or pencil location, based on fixing base and supporting seat detachably connect, when the size of busbar or pencil changes, only need select with busbar and pencil corresponding fixing base can, and the supporting seat can be general to the kind of part has been reduced, the commonality of supporting seat has been improved.

Description

Battery pack

Technical Field

The embodiment of the utility model relates to the technical field of batteries, in particular to a battery pack.

Background

A busbar or a bundling wire harness for circuit connection is arranged in the battery pack. When the battery pack vibrates, the bus bar or the strapping harness also vibrates, thereby causing a series of problems. For example, when the busbar or the bundling wire harness vibrates, friction is easily generated between the busbar or the bundling wire harness and other parts, so that an insulating layer on the surface of the busbar or the bundling wire harness is damaged, or abnormal sound is generated; alternatively, the bus bar or the bundle of wires may vibrate, resulting in failure of the circuit connection.

Disclosure of Invention

The embodiment of the utility model provides a battery pack, and the arranged fixing frame has better fixing effect on a busbar and/or a wire harness, so that the battery pack has safer use performance.

In order to achieve the above purpose, the following technical scheme is adopted:

in one aspect, a battery pack is provided, including mount, bottom plate, curb plate, battery cell, busbar and/or pencil, the curb plate encloses into the cavity that is used for holding battery cell, the busbar with battery cell electric connection, the mount includes supporting seat and fixing base, the supporting seat includes first end and the second end of following the relative setting of first direction, first end is used for connecting on the bottom plate, fixing base detachably connects the second end of supporting seat, the fixing base be used for with busbar and/or pencil detachably connect in order to with busbar and/or pencil location, based on fixing base and supporting seat detachably connect, when busbar or pencil's size change, only need select with busbar and pencil size corresponding fixing base can, and the supporting seat can be general to the kind of part has been reduced, the commonality of supporting seat has been improved.

In some embodiments, the first direction is a height direction of the battery pack, the supporting seat is provided with a limit groove, the fixing seat is provided with a limit post, at least part of the limit post is embedded into the limit groove along the first direction, and the limit post is contacted with a groove wall of the limit groove so as to limit relative rotation between the supporting seat and the fixing seat around the first direction.

In some embodiments, the fixing base includes a connection plate, a mounting portion, and a clamping plate, and the second direction is perpendicular to the first direction; the installation department with the joint board orientation the one end of supporting seat with the connecting plate is connected and follows the relative setting of second direction, the second direction with it is perpendicular to first direction, the installation department with enclose into between the joint board and hold the chamber, hold the one end that the connecting plate was kept away from to the chamber and be equipped with the opening, the opening is followed the opening size L of second direction is less than hold the chamber is followed the transverse dimension M of second direction for busbar or pencil pass through the opening card is established hold the intracavity.

In some embodiments, a stop portion is disposed at an end of the mounting portion and/or the clamping plate away from the supporting seat, and the stop portion is disposed on a surface of the mounting portion and/or the clamping plate facing the accommodating cavity in a protruding manner, so that an opening size of the opening along the second direction is smaller than a transverse size M of the accommodating cavity along the second direction.

In some embodiments, a stop is provided on both the mounting portion and the clamping plate, the two stops opposing to form the opening.

In some embodiments, the two opposite sides of the mounting portion along the second direction are respectively provided with the clamping plates, and each clamping plate and the mounting portion enclose one accommodating cavity.

In some embodiments, the end of the clamping plate away from the connecting plate is a free end, when the bus bar or the wire harness is installed, the clamping plate is extruded to move towards the end away from the mounting part so as to adjust the opening to be widened, and a guide inclined plane is arranged on one side of the stop part away from the accommodating cavity; along the direction towards the supporting seat, the distance N between the guide inclined surface and the clamping plate is increased.

In some embodiments, the fixing frame further includes a connecting member, the supporting seat is provided with a connecting hole extending along the first direction, the fixing seat is provided with a through hole, and the connecting member is connected to the connecting hole through the through hole.

In some embodiments, the limit groove and/or the connection hole penetrate through the support seat along the first direction.

In some embodiments, the limit groove includes a first limit groove and a second limit groove, the first limit groove and the second limit groove are disposed at two ends of the support base along the second direction, and the connection hole is located between the first limit groove and the second limit groove.

The battery pack provided by the embodiment of the utility model comprises a supporting seat and a fixing seat, wherein the supporting seat comprises a first end and a second end which are oppositely arranged along a first direction, the first end is used for being connected to a bottom plate of the battery pack, the fixing seat is detachably connected to the second end of the supporting seat, and the fixing seat is used for being detachably connected with a busbar and/or a wire harness to position the busbar and/or the wire harness. The supporting seat and the fixing seat are matched to fix the busbar or the wire harness relative to the bottom plate. And the supporting seat can be used for connecting the fixing seat on the bottom plate of the battery pack and supporting the fixing seat away from the bottom plate by a certain distance so as to prevent the bus bar from being in direct contact with the bottom plate. In addition, because fixing base and supporting seat detachably connect, when busbar or pencil's size change, only need select with busbar and pencil size corresponding fixing base can, and the supporting seat can be general to the kind of part has been reduced, the commonality of supporting seat has been improved.

Drawings

Fig. 1 is a schematic view of a part of a battery pack according to an embodiment of the present utility model;

fig. 2 is a top view of a portion of a battery pack according to an embodiment of the present utility model;

FIG. 3 is a partial enlarged view of FIG. 1 at B;

FIG. 4 is an enlarged view of a portion of FIG. 2 at C;

fig. 5 is a schematic structural diagram of a support seat in a fixing seat according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of a support seat in a fixing seat according to an embodiment of the present utility model;

fig. 7 to 9 are schematic structural diagrams of a fixing seat in the fixing seat according to an embodiment of the present utility model;

FIG. 10 is a bottom view of FIG. 9;

fig. 11 is a partial enlarged view of fig. 8 with respect to I.

Reference numerals:

110-a bottom plate; 120-side plates;

200-bus bars;

310-fixing seat; 310 a-a receiving cavity; 311 a-openings; 311-clamping plates; 312-mounting part; 313-limit posts; 314—a stop; 316-guiding ramp; 317-hollowed-out parts; 318-through holes; 319-connecting plates;

320-supporting seats; 320 a-a second end; 320 b-a first end; 321-a limit groove; 321 a-a first limit groove; 321 b-a second limit groove; 322-connecting holes;

330-connectors.

Detailed Description

As shown in fig. 1 to 10, an embodiment of the present utility model provides a battery pack, which may be a power battery pack, for electrically connecting with a driving motor to supply electric power to the driving motor. When the battery pack is a power battery pack, the battery pack may be applied to an electric automobile, an electric truck, an electric engineering machine, or the like. The battery pack may also be applied to other devices, which is not limited in the embodiment of the present utility model. For convenience of description, the following description will be given by taking a battery pack as an example of a power battery pack applied to an electric vehicle.

The battery pack includes a battery pack case, and a plurality of unit batteries, a bus bar 200, and/or a wire harness disposed in the battery pack case. In some examples, a Battery Management System (BMS), a thermal management system, etc. may also be provided within the battery pack.

The single battery is used as an electric energy storage unit and stores electric energy inside. The plurality of unit cells in the battery pack may be electrically connected in series and/or in parallel. The types of the unit cells may be various, and the unit cells may be lithium ion unit cells, for example.

The bus bar 200 is used to electrically connect a plurality of unit cells, and the battery pack provides power to the outside or obtains charging power through the bus bar 200. The wiring harness may transmit electrical signals, such as signals of a battery management system and a thermal management system.

The battery pack case is used to support, connect and protect the unit cells and other electrical components (e.g., battery management system, thermal management system, etc.) disposed inside the battery pack case. The battery pack case may include a bottom plate 110 and a plurality of side plates 120 connected to the periphery of the bottom plate 110, and the bottom plate 110 and the plurality of side plates 120 together define a cavity for accommodating the unit battery.

When the battery pack is vibrated during use, the bus bar 200 is easily contacted with other parts in the battery pack box, so that an insulating layer on the outer surface of the bus bar 200 is damaged due to friction, and the risk of short circuit caused by contact of the bus bar 200 with other conductive parts is increased. Furthermore, when the battery pack is vibrated during use, if the busbar 200 and the wire harness in the battery pack case are not fixed, the busbar 200 and the wire harness are liable to collide with other parts to generate abnormal sound. And, the bus bar 200 and the wire harness easily lose electrical connection with the unit cells during vibration, making the battery pack not normally operated.

In view of this, in the embodiment of the present utility model, a fixing frame for fixing the bus bar 200 and/or the wire harness is provided in the battery pack case.

The fixing frame includes a detachably connected supporting seat 320 and a fixing seat 310, the fixing seat 310 is used for being detachably connected with the busbar 200 and/or the wire harness to position the busbar 200 and/or the wire harness, the supporting seat 320 is used for connecting the fixing seat 310 on the bottom plate 110 of the battery pack and supporting the fixing seat 310 at a certain distance from the bottom plate 110 so as to prevent the busbar 200 from being in direct contact with the bottom plate 110.

Specifically, the support base 320 includes a first end 320b and a second end 320a disposed opposite to each other in the first direction, the first end 320b being adapted to be coupled to the bottom plate 110 of the battery pack, and the second end 320a being detachably coupled to the fixing base 310.

Illustratively, the support base 320 may be generally cylindrical, and the first direction is an axial direction of the cylindrical support base 320.

The first end 320b of the support seat 320 may be fixedly connected (e.g. welded, glued, etc.) to the bottom plate 110, or may be detachably connected (e.g. screwed, clamped, etc.), which is not limited in the embodiment of the present utility model. When the supporting seat 320 and the bottom plate 110 are both made of metal, the first end 320b of the supporting seat 320 may be welded to the bottom plate 110, so that the connection between the supporting seat 320 and the bottom plate 110 is prevented from being loosened due to vibration, and the variety of parts is reduced because the additional connecting member 330 is not required.

The detachable connection between the second end 320a of the supporting seat 320 and the fixing seat 310 may be a screw connection or a clamping connection, which is not limited in the embodiment of the present utility model, so long as the supporting seat 320 and the fixing seat 310 do not generate relative movement.

The sizes of the bus bar 200 and the wire harness in the battery packs of different types may be different, and when the sizes of the bus bar 200 and the wire harness are changed, only the fixing seat 310 corresponding to the sizes of the bus bar 200 and the wire harness is needed to be selected, and the supporting seat 320 can be universal, so that the types of parts are reduced, and the universality of the supporting seat 320 is improved.

In practical application, the bottom plate 110 may be connected with a plurality of fixing frames, and the plurality of fixing frames are arranged at intervals. The number of the fixing frames can be flexibly determined according to the length of the bus bar 200, and the longer the length of the bus bar 200, the more the number of the fixing frames. When a plurality of fixing frames are arranged, the fixing frames are arranged at intervals.

In the embodiment of the present utility model, when the base plate 110 and the supporting base 320 are both made of a metal material, the fixing base 310 may be made of an insulating material to prevent the bus bar 200 from being electrically connected to the base plate 110 through the fixing frame when the insulating layer on the surface of the bus bar 200 or the wire harness is damaged.

In some embodiments, the fixing base 310 and the supporting base 320 are connected along the Y-axis, and the first direction corresponds to the extending direction of the Y-axis and also corresponds to the height direction of the battery pack. Illustratively, the fixing base 310 and the supporting base 320 are connected by a bolt, and the axis of the bolt is the Y axis.

The support base 320 may be provided with a limiting groove 321, and the fixing base 310 may be provided with a limiting post 313, where at least a portion of the limiting post 313 is embedded into the limiting groove 321 along a first direction, so as to limit relative rotation between the support base 320 and the fixing base 310 around the Y axis.

The fixing base 310 and the supporting base 320 are not easy to rotate relatively, when the battery pack is vibrated, the busbar 200 and/or the wire harness fixed on the fixing base 310 is not easy to rotate along with the fixing base 310 relative to the supporting base 320, so that the fixing effect of the busbar 200 and/or the wire harness is better.

In addition, when the fixing base 310 and the supporting base 320 are connected through bolts, the limit posts 313 and the limit grooves 321 are matched to prevent the fixing base 310 from rotating relative to the supporting base 320 when the bolts are screwed, so that the fixing frame is simpler to assemble.

Illustratively, the limiting post 313 is cylindrical, and the limiting groove 321 is a semicircular groove along a cross section perpendicular to the first direction, and is provided with an open notch.

Illustratively, the limiting groove 321 includes a first limiting groove 321a and a second limiting groove 321b, the first limiting groove 321a and the second limiting groove 321b being spaced apart about the Y-axis. Correspondingly, the limiting post 313 also comprises a first limiting post and a second limiting post, the first limiting post is matched with the first limiting groove 321a, and the second limiting post is matched with the second limiting groove 321 b. For setting up a spacing groove 321 and a spacing post 313, set up the cooperation of a plurality of spacing grooves 321 and spacing post 313 for be difficult to take place to rotate between supporting seat 320 and the fixing base 310, thereby improved the fixed effect of busbar 200 and pencil.

The first limiting groove 321a and the second limiting groove 321b may have the same shape or different size. When the shapes and the sizes of the first and second limiting grooves 321a and 321b are the same, the direction does not need to be distinguished when the supporting seat 320 and the fixing seat 310 are assembled, and the assembly is more convenient. The embodiment of the present utility model will be described by taking the same shape and size of the first limiting groove 321a and the second limiting groove 321b as an example.

In some embodiments, the anchor mount 310 includes a mounting portion 312, a snap plate 311, and a connecting plate 319. The fixing base 310 is connected to the supporting base 320 through the mounting portion 312. The mounting portion 312 and the clamping plate 311 are oppositely arranged along the second direction, and one end of the mounting portion 312 and the clamping plate 311, which faces the supporting seat 320, is connected with the connecting plate 319, so that a containing cavity 310a is enclosed between the mounting portion 312 and the clamping plate 311, an opening 311a is arranged at one end, far away from the connecting plate 319, of the containing cavity 310a, and the busbar 200 or the wire harness is clamped in the containing cavity 310a through the opening 311a. Wherein, the opening dimension L of the opening 311a along the second direction is smaller than the transverse dimension M of the receiving cavity 310a along the second direction to prevent the bus bar 200 or the wire harness from coming out through the opening 311a. The second direction is perpendicular to the first direction.

Illustratively, dimension M may be obtained by measuring the distance between the side of the clamping plate 311 facing the receiving cavity 310a and the side of the mounting portion 312 facing the receiving cavity 310a using a caliper or tape measure. Dimension L may be obtained by measuring the distance between the clamping plate 311 and the end of the mounting portion 312 remote from the connecting plate 319 using a caliper or tape measure.

The bus bar 200 or the wire harness is fixed in the accommodating cavity 310a by a clamping manner, so that the fixing and the dismounting of the bus bar 200 or the wire harness are simpler.

Illustratively, the clamping plate 311 is an elastic plate capable of elastic deformation under compression. When the bus bar 200 or the wire harness is installed, the bus bar 200 or the wire harness is placed into the opening 311a of the accommodating cavity 310a, the clamping plate 311 is pressed by the bus bar 200 or the wire harness in a direction away from the installation part 312, the clamping plate 311 is elastically deformed in a direction away from the installation part 312, the opening 311a of the accommodating cavity 310a is enlarged, and therefore the bus bar 200 or the wire harness can be clamped into the accommodating cavity 310a. And, the clamping plate 311 is sprung back by its own elastic force, so that the clamping plate 311 moves toward the mounting portion 312, thereby causing the clamping plate 311 and the mounting portion 312 to clamp the busbar 200 or the wire harness.

Illustratively, the connection plate 319 is an elastic plate capable of being elastically deformed by an external force. When the busbar 200 or the wire harness is installed, the busbar 200 or the wire harness is placed into the opening 311a of the accommodating cavity 310a, the clamping plate 311 is pressed by the busbar 200 or the wire harness along the direction away from the installation portion 312, the clamping plate 311 is displaced along the direction away from the installation portion 312, the opening 311a of the accommodating cavity 310a is enlarged, the clamping plate 311 drives the connecting plate 319 to elastically deform, and the busbar 200 or the wire harness is clamped into the accommodating cavity 310a through the opening 311a. And, the connection plate 319 rebounds under its own elastic force so that the click plate 311 moves toward the mounting portion 312, thereby causing the click plate 311 and the mounting portion 312 to grip the bus bar 200 or the wire harness.

In some embodiments, the fixing base 310 may further be provided with a stopper 314, and the stopper 314 is located at the opening 311a of the receiving cavity 310a to stop the busbar 200 or the wire harness from being removed from the receiving cavity 310a. The stop portion 314 may be connected to an end of the mounting portion 312 away from the support seat 320, or may be connected to an end of the clamping plate 311 away from the support seat 320, or both the end of the mounting portion 312 away from the support seat 320 and the end of the clamping plate 311 away from the support seat 320 may be provided with the stop portion 314.

Illustratively, the stop 314 protrudes from a sidewall of the receiving cavity 310a and extends toward the receiving cavity 310a.

When the stopper 314 is provided at the mounting portion 312, a gap between the stopper 314 and the click plate 311 forms an opening 311a of the accommodation chamber 310 a; when the stopper 314 is provided at the click plate 311, a gap between the stopper 314 and the mounting portion 312 forms an opening 311a of the accommodation chamber 310 a; when the stopper portions 314 are provided at both the click plate 311 and the mounting portion 312, a gap between the two stopper portions 314 forms an opening 311a of the accommodation chamber 310a.

The size of the opening 311a and the size of the stopper 314 extending toward the receiving cavity 310a may be flexibly set according to the size of the bus bar 200 or the wire harness, the elasticity of the connection plate 319 or the clamping plate 311, the application environment of the battery pack, and the like.

The stopper 314 makes an opening dimension L of the opening 311a along the second direction smaller than a lateral dimension M of the receiving cavity 310a along the second direction, thereby preventing the bus bar 200 or the wire harness from coming out of the opening 311a.

Illustratively, dimension M may be obtained by measuring the distance between the side of the clamping plate 311 facing the receiving cavity 310a and the side of the mounting portion 312 facing the receiving cavity 310a using a caliper or tape measure. Dimension L may be obtained by measuring the distance between the two stops 314 using a caliper or tape measure.

Illustratively, the distance of the stop 314 from the connecting plate 319 is slightly greater than the dimension of the busbar 200 or harness in the first direction. This allows the stopper 314 to clamp the bus bar 200 or the wire harness with the connection plate 319, thereby making the fixing effect of the bus bar 200 or the wire harness better.

In some embodiments, the end of the clamping plate 311 remote from the connecting plate 319 is a free end for pressing the clamping plate 311 toward the end remote from the mounting portion 312 to adjust the opening 311a to be widened when the busbar 200 or the wire harness is loaded. As shown in fig. 11, a guide slope 316 is disposed on a side of the stop portion 314 facing away from the accommodating cavity 310a, and a distance N between the guide slope 316 and the clamping plate 311 is gradually increased along a direction toward the supporting seat 320, so that when the bus bar 200 or the wire harness contacts with the guide slope 316, the bus bar 200 or the wire harness can press the clamping plate 311 through the guide slope 316, and guide the bus bar 200 or the wire harness toward the opening 311a of the accommodating cavity 310a. Alternatively, the distance N between the guide inclined surface 316 and the engagement plate 311 gradually increases with a predetermined gradient.

Where N is the distance between the guide slope 316 and the side of the clamping plate 311 facing the accommodating cavity 311a. The distance between the points on the guide inclined surface 316 and the side of the clamping plate 311 facing the accommodating cavity 311a can be measured by using a tape measure or a caliper, wherein the distance between the points and the connecting plate can be gradually reduced.

Illustratively, a reinforcing rib is provided on a side of the stopper 314 remote from the receiving cavity 310a to prevent the stopper 314 from being deformed by the extrusion of the bus bar 200 or the wire harness, and a guide slope 316 is provided on the reinforcing rib.

In some embodiments, two opposite sides of the mounting portion 312 along the second direction are provided with clamping plates 311, and each clamping plate 311 and the mounting portion 312 enclose a receiving cavity 310a. That is, one of the clamping plates 311 and the mounting portion 312 enclose one accommodating chamber 310a, the other clamping plate 311 and the mounting portion 312 enclose the other accommodating chamber 310a, and the busbar 200 or the wire harness can be fixed in each accommodating chamber 310a. So that one fixing frame can fix two bus bars 200, or two wire harnesses, or one bus bar 200 and one wire harness.

Illustratively, the harness is a weak-current signal harness, and in order to prevent current in the busbar 200 from interfering with weak-current signals in the harness, the busbar 200 may be secured in one of the receiving cavities 310a and the weak-current signal harness secured in the other receiving cavity 310a.

In order to reduce the material consumption of the fixing base 310, the connecting plate 319 may be provided with a hollowed-out portion 317.

In some embodiments, the fixing frame further includes a connection member 330, the support base 320 is provided with a connection hole 322 extending along the first direction, the fixing base 310 is provided with a through hole 318, and the connection member 330 is connected to the connection hole 322 through the through hole 318.

Illustratively, the connection member 330 is a bolt, the connection hole 322 is a threaded hole, and the bolt is threaded through the through hole 318 to the threaded hole, thereby detachably connecting the fixing base 310 to the supporting base 320. The connection member 330 may also be a pin provided with a connection key, etc.

Illustratively, when the limiting groove 321 includes a first limiting groove 321a and a second limiting groove 321b, the first limiting groove 321a and the second limiting groove 321b are disposed at both ends of the supporting seat 320 along the second direction, and the connection hole 322 is located between the first limiting groove 321a and the second limiting groove 321 b. This may allow for a more even force on the support 320.

In some embodiments, a through hole 318 may be provided at the mounting portion 312. When two accommodating cavities 310a are provided, one of the two accommodating cavities 310a is located at one side of the through hole 318, and the other of the two accommodating cavities 310a is located at the opposite side of the through hole 318, so that the stress of the fixing frame is more balanced.

In some embodiments, the limiting groove 321 and/or the connecting hole 322 penetrate the support seat 320 along the first direction. This makes the first end 320b and the second end 320a of the support base 320 identical in structure, and eliminates the need to distinguish between the first end 320b and the second end 320a of the support base 320 when the support base 320 is coupled to the base plate 110, thereby preventing the support base 320 from being erroneously mounted. And, when the limiting groove 321 and the connecting hole 322 all penetrate the supporting seat 320, the supporting seat 320 can be prepared in an extrusion manner, so that the production efficiency of the supporting seat 320 is improved and the production cost is reduced.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or terminal device comprising the element.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The battery pack is characterized by comprising a fixing frame, a bottom plate (110), side plates (120), single batteries, a busbar (200) and/or a wire harness, wherein the side plates (120) are enclosed to form a cavity for accommodating the single batteries, the busbar (200) is electrically connected with the single batteries, the fixing frame comprises a supporting seat (320) and a fixing seat (310),

the support base (320) comprises a first end (320 b) and a second end (320 a) which are oppositely arranged along a first direction, the first end (320 b) is used for being connected to the bottom plate (110), the fixing base (310) is detachably connected to the second end (320 a) of the support base (320), and the fixing base (310) is used for being detachably connected with the busbar (200) and/or the wire harness to position the busbar (200) and/or the wire harness.

2. The battery pack according to claim 1, wherein the first direction is a height direction of the battery pack, the supporting base (320) is provided with a limiting groove (321), the fixing base (310) is provided with a limiting post (313), at least part of the limiting post (313) is embedded into the limiting groove (321) along the first direction, and the limiting post (313) is contacted with a groove wall of the limiting groove (321) so as to limit relative rotation between the supporting base (320) and the fixing base (310) around the first direction.

3. The battery pack according to claim 1, wherein the fixing base (310) includes a connection plate (319), a mounting portion (312), and a clamping plate (311); one end of the mounting part (312) and the clamping plate (311) facing the supporting seat (320) is connected with the connecting plate (319) and is oppositely arranged along a second direction, and the second direction is perpendicular to the first direction; enclose between installation department (312) with joint board (311) and hold chamber (310 a), hold chamber (310 a) keep away from the one end of connecting plate (319) is equipped with opening (311 a), opening (311 a) are along opening size L of second direction is less than hold chamber (310 a) are along transverse dimension M of second direction for busbar (200) or pencil pass through opening (311 a) card is established hold in chamber (310 a).

4. A battery pack according to claim 3, wherein the mounting portion (312) and/or the end of the clamping plate (311) away from the supporting seat (320) is provided with a stop portion (314), and the stop portion (314) is convexly disposed on the surface of the mounting portion (312) and/or the clamping plate (311) facing the accommodating cavity (310 a), so that the opening dimension L of the opening (311 a) along the second direction is smaller than the transverse dimension M of the accommodating cavity (310 a) along the second direction.

5. The battery pack according to claim 4, wherein a stopper portion (314) is provided on each of the mounting portion (312) and the click plate (311), and the two stopper portions (314) are formed opposite to each other with the opening (311 a).

6. A battery pack according to claim 3, wherein the mounting portion (312) is provided with the clamping plates (311) on opposite sides in the second direction, and each clamping plate (311) and the mounting portion (312) define one accommodating chamber (310 a).

7. The battery pack according to claim 4, wherein the end of the clamping plate (311) away from the connecting plate (319) is a free end, when the bus bar (200) or the wire harness is assembled, the clamping plate (311) is pressed to move towards the end away from the mounting part (312) to adjust the opening (311 a) to be widened, and a guide inclined surface (316) is arranged on the side of the stop part (314) away from the accommodating cavity (310 a); the distance N between the guide inclined surface (316) and the clamping plate (311) increases along the direction towards the supporting seat (320).

8. The battery pack according to claim 2, wherein the fixing frame further comprises a connecting member (330), the supporting base (320) is provided with a connecting hole (322) extending along the first direction, the fixing base (310) is provided with a through hole (318), and the connecting member (330) is connected to the connecting hole (322) through the through hole (318).

9. The battery pack according to claim 8, wherein the limiting groove (321) and/or the connecting hole (322) penetrate the support base (320) in the first direction.

10. The battery pack according to claim 8, wherein the limiting groove (321) includes a first limiting groove (321 a) and a second limiting groove (321 b), the first limiting groove (321 a) and the second limiting groove (321 b) are disposed at both ends of the support base (320) along the second direction, and the connection hole (322) is located between the first limiting groove (321 a) and the second limiting groove (321 b).