CN219717153U - Battery pack - Google Patents

Abstract

The embodiment of the present application provides a battery pack, which relates to the field of battery technology. It includes a fixed frame, a bottom plate, a side plate, a single battery, a bus bar and/or a wire harness, the side plates enclose a cavity for accommodating the single battery, the bus bar is electrically connected to the single battery, The fixing frame includes a support base and a fixing base. The support base includes a first end and a second end that are oppositely arranged along a first direction. The first end is used to be connected to the base plate. The fixing base can Detachably connected to the second end of the support base, the fixing base is used to detachably connect with the bus bar and/or wire harness to position the bus bar and/or wire harness, based on the fixing base and the support base Detachably connected, when the size of the busbar or wire harness changes, you only need to select a fixed base corresponding to the size of the busbar and wire harness, and the support base can be universal, thus reducing the types of parts and improving the support base of versatility.

Description

battery pack

Technical field

The embodiments of the present application relate to the field of battery technology, and in particular, to a battery pack.

Background technique

The battery pack is equipped with busbars or bundled wire harnesses for circuit connections. When the battery pack vibrates, the busbar or bundled wire harness will also vibrate, causing a series of problems. For example, when the busbar or bundled wire harness vibrates, it is easy to rub against other components, destroying the insulation layer on the surface of the busbar or bundled wire harness, or producing abnormal noise; or, when the busbar or bundled wire harness vibrates, it may cause circuit connection failure.

Utility model content

Embodiments of the present application provide a battery pack. The fixed bracket provided has a better fixing effect on the busbar and/or wire harness, and the battery pack has safer performance.

In order to achieve the above purpose, the following technical solutions are adopted:

On the one hand, a battery pack is provided, including a fixed frame, a bottom plate, side plates, single cells, a bus bar and/or a wire harness. The side plates enclose a cavity for accommodating single cells, and the bus bar Electrically connected to the single battery, the fixing frame includes a support base and a fixing base. The support base includes a first end and a second end oppositely arranged along a first direction. The first end is used to connect to the On the base plate, the fixing base is detachably connected to the second end of the support base, and the fixing base is used to detachably connect with the bus bar and/or wire harness to connect the bus bar and/or wire harness. Or wire harness positioning, based on the detachable connection of the fixed seat and the supporting seat. When the size of the busbar or wire harness changes, you only need to select the fixed seat corresponding to the size of the busbar and wire harness, and the supporting seat can be universal, so that The types of parts are reduced and the versatility of the support seat is improved.

In some embodiments, the first direction is the height direction of the battery pack, the support base is provided with a limiting slot, the fixed base is provided with a limiting column, and at least part of the limiting column is along the first The first direction is embedded in the limiting groove, and the limiting column contacts the groove wall of the limiting groove to limit the relative rotation between the support base and the fixed base around the first direction.

In some embodiments, the fixed base includes a connecting plate, a mounting part and a clamping plate, and the second direction is perpendicular to the first direction; the mounting part and the clamping plate face the supporting base. One end is connected to the connecting plate and is arranged oppositely along a second direction, the second direction is perpendicular to the first direction, an accommodation cavity is enclosed between the mounting portion and the clamping plate, and the accommodation cavity is away from An opening is provided at one end of the connecting plate, and the opening size L along the second direction is smaller than the lateral size M of the accommodation cavity along the second direction, so that the busbar or wire harness is clamped through the opening. in the containing cavity.

In some embodiments, the end of the mounting part and/or the clamping plate away from the support base is provided with a stopper, and the stopper protrusion is provided on the mounting part and/or the clamping plate. The surface of the connecting plate faces the accommodation cavity, so that the opening size of the opening along the second direction is smaller than the transverse dimension M of the accommodation cavity along the second direction.

In some embodiments, stop portions are provided on both the mounting portion and the clamping plate, and the two stop portions oppose each other to form the opening.

In some embodiments, the clamping plates are provided on opposite sides of the mounting portion along the second direction, and each of the clamping plates and the mounting portion form a receiving cavity.

In some embodiments, the end of the clamping plate away from the connecting plate is a free end. When used to install a busbar or wire harness, the clamping plate can be squeezed to move toward the end away from the installation portion to adjust As the opening expands, a guide slope is provided on the side of the stopper away from the accommodation cavity; in the direction toward the support seat, the distance N between the guide slope and the clamping plate increases.

In some embodiments, the fixing bracket further includes a connecting piece, the supporting base is provided with a connecting hole extending along the first direction, the fixing base is provided with a through hole, and the connecting piece passes through the through hole. hole is connected to the connecting hole.

In some embodiments, the limiting groove and/or the connecting hole penetrates the support base along the first direction.

In some embodiments, the limiting groove includes a first limiting groove and a second limiting groove, and the first limiting groove and the second limiting groove are provided on both sides of the support base along the second direction. end, the connecting hole is located between the first limiting groove and the second limiting groove.

In the battery pack provided by the embodiment of the present application, the fixing frame includes a support base and a fixing base. The support base includes a first end and a second end that are oppositely arranged along a first direction. The first end is used to be connected to the bottom plate of the battery pack and fixed. The seat is detachably connected to the second end of the support seat, and the fixed seat is used to detachably connect with the busbar and/or wire harness to position the busbar and/or wire harness. The support base and the fixing base cooperate to fix the busbar or wire harness relative to the base plate. Moreover, the support base can connect the fixing base to the bottom plate of the battery pack, and support the fixing base at a certain distance from the bottom plate to prevent the bus bar from being in direct contact with the bottom plate. In addition, since the fixed base and the supporting base are detachably connected, when the size of the busbar or wire harness changes, you only need to select the fixed base corresponding to the size of the busbar and wire harness, and the supporting base can be used universally, thereby reducing the number of The variety of parts improves the versatility of the support base.

Description of drawings

Figure 1 is a partial structural schematic diagram of a battery pack provided by an embodiment of the present application;

Figure 2 is a partial structural top view of a battery pack provided by an embodiment of the present application;

Figure 3 is a partial enlarged view of point B in Figure 1;

Figure 4 is a partial enlarged view of point C in Figure 2;

Figure 5 is a schematic structural diagram of a support base in a fixed base provided by an embodiment of the present application;

Figure 6 is a schematic cross-sectional view of a support base in a fixed base provided by an embodiment of the present application;

Figures 7 to 9 are schematic structural diagrams of a fixed base provided in an embodiment of the present application;

Figure 10 is a bottom view relative to Figure 9;

FIG. 11 is a partial enlarged view of position I in FIG. 8 .

Reference signs:

110 - bottom plate; 120 - side plate;

200-Bus;

310-fixed seat; 310a-accommodating cavity; 311a-opening; 311-clipping plate; 312-installation part; 313-limiting column; 314-stop part; 316-guide slope; 317-hollow part; 318-through Hole; 319 - connecting plate;

320-support seat; 320a-second end; 320b-first end; 321-limiting groove; 321a-first limiting groove; 321b-second limiting groove; 322-connecting hole;

330 - Connectors.

Detailed ways

As shown in FIGS. 1 to 10 , embodiments of the present application provide a battery pack, which may be a power battery pack and used to electrically connect with a driving motor to provide electric energy to the driving motor. When the battery pack is a power battery pack, the battery pack can be used in electric vehicles, electric trucks, electric engineering machinery, etc. The battery pack can also be applied to other devices, which is not limited in the embodiments of this application. For convenience of description, the following description only takes the battery pack as a power battery pack used in electric vehicles as an example.

The battery pack includes a battery pack box and a plurality of single cells, a busbar 200 and/or a wire harness arranged in the battery pack box. In some examples, the battery pack may also be equipped with a battery management system (BMS), thermal management system, etc.

A single battery acts as an electrical energy storage unit and stores electrical energy internally. Multiple single cells in the battery pack can be electrically connected in series and/or in parallel. There can be many types of single cells. For example, the single cells can be lithium-ion single cells.

The bus bar 200 is used to realize the electrical connection of multiple single batteries, and the battery pack provides external electric energy or obtains charging electric energy through the bus bar 200 . Wiring harnesses can carry electrical signals, such as those for battery management systems and thermal management systems.

The battery pack box is used to support, connect and protect the single cells and other electrical components (for example, battery management system, thermal management system, etc.) installed inside the battery pack box. The battery pack box may include a bottom plate 110 and a plurality of side plates 120 connected to the periphery of the bottom plate 110. The bottom plate 110 and the plurality of side plates 120 together form a cavity for accommodating single cells.

When the battery pack is vibrated during use, the bus bar 200 is easily in contact with other components in the battery pack box, causing the insulation layer on the outer surface of the bus bar 200 to be damaged due to friction, increasing the number of connections between the bus bar 200 and other conductive components. Risk of short circuit due to contact. Furthermore, when the battery pack is vibrated during use, if the bus bar 200 and the wire harness in the battery pack box are not fixed, the bus bar 200 and the wire harness may easily collide with other components and produce abnormal noise. Moreover, the busbar 200 and the wiring harness are prone to lose electrical connection with the single cells during vibration, causing the battery pack to fail to operate normally.

In view of this, in the embodiment of the present application, a fixing bracket is provided in the battery pack box for fixing the busbar 200 and/or the wire harness.

The fixing frame includes a detachably connected support base 320 and a fixing base 310. The fixing base 310 is used to detachably connect with the bus bar 200 and/or the wire harness to position the bus bar 200 and/or the wire harness. The support base 320 is used to fix the bus bar 200 and/or the wire harness. The base 310 is connected to the bottom plate 110 of the battery pack, and the fixed base 310 is separated from the bottom plate 110 by a certain distance to prevent the bus bar 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 that are oppositely arranged along the first direction. The first end 320b is used to be connected to the bottom plate 110 of the battery pack, and the second end 320a is detachably connected to the fixing base 310. connect.

For example, the support base 320 may be columnar as a whole, and the first direction is the axis direction of the columnar support base 320 .

The first end 320b of the support base 320 and the bottom plate 110 may be fixedly connected (for example, welding, bonding, etc.) or detachably connected (screw connection, snapping, etc.), which is not limited in the embodiments of the present application. When the support base 320 and the bottom plate 110 are both made of metal, the first end 320b of the support base 320 can be welded to the bottom plate 110. This can prevent the connection between the support base 320 and the bottom plate 110 from being loosened due to vibration, and no additional components are needed. The connector 330 reduces the types of parts.

The detachable connection between the second end 320a of the support base 320 and the fixed base 310 can be a screw connection or a snap connection. The embodiment of the present application is not limited to this, as long as the support base 320 and the fixed base 310 can prevent relative movement. That’s it.

The sizes of the bus bar 200 and the wire harness in different models of battery packs may be different. When the sizes of the bus bar 200 and the wire harness change, you only need to select the fixing base 310 corresponding to the size of the bus bar 200 and the wire harness, and the support base 320 can be used universally, thereby reducing the types of parts and improving the versatility of the support base 320 .

In actual application, multiple fixing brackets may be connected to the base plate 110, and the multiple fixing brackets may be arranged at intervals. The number of fixing brackets can be flexibly determined according to the length of the bus bar 200. The longer the length of the bus bar 200, the greater the number of fixing brackets. When multiple fixing brackets are provided, the multiple fixing brackets are spaced apart.

In the embodiment of the present application, when the bottom plate 110 and the support base 320 are both made of metal materials, the fixing base 310 can be made of an insulating material to prevent the bus bar 200 or the insulation layer on the surface of the wire harness from being damaged. The bus bar 200 is fixed by The frame is electrically connected to the base plate 110.

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 extension direction of the Y-axis and also corresponds to the height direction of the battery pack. For example, the fixed base 310 and the supporting base 320 are connected through bolts, and the axis of the bolt is the Y-axis.

The support base 320 may be provided with a limiting groove 321, and the fixed base 310 may be provided with a limiting column 313. At least part of the limiting column 313 is embedded in the limiting groove 321 along the first direction to limit the Y rotation between the supporting base 320 and the fixed base 310. The shafts rotate relative to each other.

Relative rotation between the fixed base 310 and the supporting base 320 is not easy to occur. When the battery pack is vibrated, the bus bar 200 and/or the wire harness fixed on the fixed base 310 cannot easily follow the fixed base 310 to rotate relative to the supporting base 320, causing the bus bar to rotate relative to the supporting base 320. 200 and/or wire harness fixation is better.

In addition, when the fixed base 310 and the supporting base 320 are connected by bolts, the limiting column 313 and the limiting groove 321 cooperate to prevent the fixed base 310 from rotating relative to the supporting base 320 when the bolts are tightened, making the assembly of the fixed frame easier.

For example, the limiting post 313 is cylindrical, and the limiting groove 321 is a semicircular groove with a cross-section perpendicular to the first direction, and is provided with an open slot.

Exemplarily, 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 spaced apart around the Y-axis. Correspondingly, the limiting column 313 also includes a first limiting column and a second limiting column. The first limiting column cooperates with the first limiting groove 321a, and the second limiting column cooperates with the second limiting groove 321b. Compared with providing one limiting groove 321 and one limiting column 313, the cooperation of multiple limiting grooves 321 and limiting columns 313 makes it less likely for the support base 320 and the fixed base 310 to rotate, thereby improving the confluence. Fixed effect of row 200 and harness.

The shapes and sizes of the first limiting groove 321a and the second limiting groove 321b may be the same or different. When the first limiting groove 321a and the second limiting groove 321b have the same shape and size, there is no need to distinguish directions when assembling the supporting base 320 and the fixed base 310, making the assembly more convenient. The embodiment of the present application only takes the first limiting groove 321a and the second limiting groove 321b as having the same shape and size as an example for description.

In some embodiments, the fixed base 310 includes a mounting portion 312, a clamping plate 311 and a connecting plate 319. The fixed base 310 is connected to the supporting base 320 through the mounting portion 312 . The mounting part 312 and the clamping plate 311 are arranged opposite to each other along the second direction, and the mounting part 312 and the clamping plate 311 are connected to the connecting plate 319 toward one end of the support base 320, so that the mounting part 312 and the clamping plate 311 form an accommodating space. Cavity 310a, the end of the accommodation cavity 310a away from the connecting plate 319 is provided with an opening 311a, and the busbar 200 or the wire harness is stuck in the accommodation cavity 310a through the opening 311a. The opening size L along the second direction of the opening 311a is smaller than the lateral size M along the second direction of the accommodation cavity 310a to prevent the busbar 200 or the wire harness from protruding through the opening 311a. The second direction is perpendicular to the first direction.

For example, the dimension M can be obtained by using a caliper or tape measure to measure the distance between the side of the clamping plate 311 facing the accommodation cavity 310a and the side of the mounting portion 312 facing the accommodation cavity 310a. Dimension L can be obtained by measuring the distance between the clamping plate 311 and the end of the mounting portion 312 away 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 through clamping, which makes the fixing and disassembly of the bus bar 200 or the wire harness easier.

For example, the clamping plate 311 is an elastic plate that can elastically deform under extrusion. When installing the bus bar 200 or the wire harness, put the bus bar 200 or the wire harness into the opening 311a of the receiving cavity 310a, and make the bus bar 200 or the wire harness press the clamping plate 311 in the direction away from the installation part 312, so that the clamping plate 311 moves along the The elastic deformation occurs in the direction away from the mounting portion 312, so that the opening 311a of the accommodation cavity 310a becomes larger, so that the bus bar 200 or the wire harness can be stuck into the accommodation cavity 310a. Moreover, the clamping plate 311 rebounds under its own elastic force, causing the clamping plate 311 to move toward the mounting part 312, so that the clamping plate 311 and the mounting part 312 clamp the busbar 200 or the wire harness.

For example, the connecting plate 319 is an elastic plate that can undergo elastic deformation under the action of external force. When installing the bus bar 200 or the wire harness, put the bus bar 200 or the wire harness into the opening 311a of the receiving cavity 310a, and make the bus bar 200 or the wire harness press the clamping plate 311 in the direction away from the installation part 312, so that the clamping plate 311 moves along the The displacement in the direction away from the mounting portion 312 causes the opening 311a of the accommodation cavity 310a to become larger and the clamping plate 311 drives the connecting plate 319 to elastically deform. The busbar 200 or the wire harness is clamped into the accommodation cavity 310a through the opening 311a. Moreover, the connecting plate 319 rebounds under its own elastic force, causing the clamping plate 311 to move toward the mounting part 312, so that the clamping plate 311 and the mounting part 312 clamp the busbar 200 or the wire harness.

In some embodiments, the fixed base 310 may also be provided with a stopper 314 located at the opening 311a of the accommodation cavity 310a to prevent the busbar 200 or wire harness from coming out of the accommodation cavity 310a. The stopper 314 can be connected to the end of the mounting portion 312 away from the support base 320, or can be connected to the end of the clamping plate 311 away from the support base 320, or the end of the mounting portion 312 away from the support base 320 and the clamping plate 311. One end of the support base 320 is provided with a stopper 314 .

For example, the stopper 314 protrudes from the side wall of the accommodation cavity 310a and extends toward the accommodation cavity 310a.

When the stopper 314 is disposed on the mounting part 312, the gap between the stopper 314 and the clamping plate 311 forms the opening 311a of the accommodation cavity 310a; when the stopper 314 is disposed on the clamping plate 311, the stopper 314 The gap between the two stopper parts 312 forms the opening 311a of the accommodation cavity 310a; when the stopper part 314 is disposed on the clamping plate 311 and the installation part 312 at the same time, the gap between the two stopper parts 314 forms the opening of the accommodation cavity 310a. 311a.

The size of the opening 311a and the size of the stopper 314 extending toward the accommodation cavity 310a can be flexibly set according to the size of the busbar 200 or wire harness, the elasticity of the connecting plate 319 or the clamping plate 311, the application environment of the battery pack, etc.

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

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

For example, the distance between the stopper 314 and the connecting plate 319 is slightly larger than the size of the bus bar 200 or the wire harness along the first direction. In this way, the stopper 314 and the connecting plate 319 can clamp the bus bar 200 or the wire harness, thereby improving the fixing effect of the bus bar 200 or the wire harness.

In some embodiments, the end of the clamping plate 311 away from the connecting plate 319 is a free end. When used to install the busbar 200 or a wire harness, the clamping plate 311 is pressed to move toward the end away from the mounting portion 312 to adjust the opening 311a to expand. . As shown in FIG. 11 , a guide slope 316 is provided on the side of the stopper 314 away from the accommodation cavity 310 a. Along the direction toward the support base 320 , the distance N between the guide slope 316 and the clamping plate 311 gradually increases, so that the bus bar 200 Or when the wire harness comes into contact with the guide bevel 316, the bus bar 200 or the wire harness can press the clamping plate 311 through the guide bevel 316, and guide the bus bar 200 or the wire harness towards the opening 311a of the accommodation cavity 310a. Alternatively, the distance N between the guide slope 316 and the clamping plate 311 gradually increases according to a preset gradient.

Wherein, N is the distance between the guide slope 316 and the side of the clamping plate 311 facing the accommodation cavity 311a. During measurement, a tape measure or caliper can be used to measure the distance between multiple points on the guide slope 316 and the side of the clamping plate 311 facing the accommodation cavity 311a, where the distance between the multiple points and the connecting plate can gradually decrease.

For example, a reinforcing rib is provided on the side of the stopper 314 away from the accommodation cavity 310a to prevent the stopper 314 from deforming under the extrusion of the bus bar 200 or the wire harness, and the guide slope 316 is provided on the reinforcing rib.

In some embodiments, clamping plates 311 are provided on opposite sides of the mounting part 312 along the second direction, and each clamping plate 311 and the mounting part 312 form a receiving cavity 310a. That is, one of the clamping plates 311 and the mounting part 312 forms an accommodating cavity 310a, and the other clamping plate 311 and the mounting part 312 enclose another accommodating cavity 310a. The busbar 200 or the like can be fixed in each accommodating cavity 310a. wiring harness. Therefore, one fixing frame can fix two bus bars 200, or two wire harnesses, or one bus bar 200 and one wire harness.

For example, the wire harness is a weak current signal wire harness. In order to prevent the current in the bus bar 200 from interfering with the weak current signal in the wire harness, the bus bar 200 can be fixed in one of the accommodation cavities 310a, and the weak current signal wire harness can be fixed in the other accommodation cavity 310a. Inside.

In order to reduce the material consumption of the fixed base 310, the connecting plate 319 may be provided with a hollow portion 317.

In some embodiments, the fixed frame also includes a connecting member 330. The supporting base 320 is provided with a connecting hole 322 extending along the first direction. The fixed base 310 is provided with a through hole 318. The connecting member 330 passes through the through hole 318 and is connected to the connecting hole. 322.

For example, the connecting member 330 is a bolt, the connecting hole 322 is a threaded hole, and the bolt passes through the through hole 318 and is threadedly connected to the threaded hole, thereby detachably connecting the fixed base 310 to the supporting base 320 . The connecting piece 330 can also be a pin with a connecting key, etc.

For example, 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 provided at both ends of the support base 320 along the second direction. , the connecting hole 322 is located between the first limiting groove 321a and the second limiting groove 321b. This can make the force on the support base 320 more balanced.

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

In some embodiments, the limiting groove 321 and/or the connecting hole 322 penetrate the support base 320 along the first direction. In this way, the first end 320b and the second end 320a of the support base 320 can have the same structure. When the support base 320 is connected to the bottom plate 110, there is no need to distinguish the first end 320b and the second end 320a of the support base 320, thereby preventing support. Block 320 is installed incorrectly. Moreover, when the limiting groove 321 and the connecting hole 322 both penetrate the support base 320, the support base 320 can be prepared by extrusion, so that the production efficiency of the support base 320 is improved and the production cost is reduced.

Finally, it should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or any such actual relationship or sequence between operations. Furthermore, the terms "comprises," "comprises," or any other variation thereof are intended to cover a non-exclusive inclusion such that a process, method, article, or end device that includes a list of elements includes not only those elements, but also elements not expressly listed or other elements inherent to such process, method, article or terminal equipment. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or terminal device including the stated element.

The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application. should be covered by the protection scope of this application. Therefore, the protection scope of this application should be 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).