CN217421801U - Battery system locking mechanism and battery pack - Google Patents

Abstract

The utility model relates to a battery system locking mechanism and battery package, battery system locking mechanism include fixed loop bar and first nut, be equipped with the first external screw thread section of wearing out battery package casing top cap on the lateral wall of fixed loop bar respectively, the first external screw thread section and the first nut adaptation threaded connection of fixed loop bar. The utility model discloses a set up the first external screw thread section on the lateral wall that fixed loop bar wore out the battery can casing top cap, can utilize first nut and first external screw thread section threaded connection, realize compressing tightly fixed with battery can casing top cap, solved the problem that the internal thread connection adopted at present produces bolt torsion decay easily; compared with the prior art, one part is eliminated, the number of processing parts is reduced, the processing assembly manufacturing cost is reduced, and an economical mechanism is provided; the utility model discloses a first nut can adopt standard nut, has reduced the processing cost, has simplified the equipment mode, avoids processing position degree off normal.

Description

Battery system locking mechanism and battery pack

Technical Field

The utility model relates to a power battery correlation technique field, concretely relates to battery system locking mechanism and battery package.

Background

At present, the top fixing mode of the vehicle-mounted power battery structure in the market is mainly realized by fixing upper and lower structural members through bolts, the peripheral sealing welding mode is increased, and the middle position of the structural member of the power battery is fixed with a beam of a bottom plate of the automobile. Along with the increase of the driving mileage, the aggravation of severe degrees such as the cyclic change of the driving environment and the like, in addition, the influence of common-frequency resonance and impact generated by vehicle structural components easily generates accumulated damage to the bolts and the welding parts at the connecting position of the bottom frame, the danger of bolt slipping is generated, and the welding parts generate cracks and even fracture due to fatigue stress.

Application No. 201910027173.5, patent publication No. CN111435716A, patent name of battery system and its mounting case and electric vehicle with the battery system, disclose a top fixing manner of power battery structure, in which a sealing member of the top fixing manner adopts a connection manner of internal threads, as described in the specification of the invention patent: the seal may include a sealing portion and a connecting portion, the sealing portion may be located outside the mounting cavity, and the sealing portion may be provided on the portion of the mounting post. The connecting portion can be connected with the sealing portion, and the first part of connecting portion can pass first through-hole and stretch into the installation intracavity, and the first part of connecting portion can be located the installation intracavity promptly. The first portion of the connecting portion is connectable to the mounting post.

The existing top fixing mode of the power battery structure has the following defects: (1) connecting portion adopt the internal screw thread mode to be connected with the installation cavity, and the concentricity needs to be considered in the processing thread face, leads to secondary operation positioning deviation, and processing cost increases. The deviation of the threaded connection can cause the deviation of the fixed bottom frame, further lead to stress increase, and the problems of meshing abrasion, breakage and the like are easily caused by the internal threaded connection structure. (2) Connecting portion are connected with the installation cavity and generally adopt circle welding reinforcement mode, lead to welding infiltration easily in the welding, and inside aluminum alloy thread face is destroyed to high temperature, influences sealing performance, and there is the welding bad condition to take place. In vehicle fixed connection, later stage operating mode produces fatigue wear to bolt and welding position to underframe impact, vibration, leads to welding fracture, and the bolt pine takes off the deformation, and is sealed unable to obtain guaranteeing. (3) Connecting portion and installation cavity are the circular sleeve structure of whole body, very easily produce the cooperation in assembly, vehicle formation not hard up, long-term production friction, damage the jack, harm inside fixing bolt, produce the battery package hidden danger that drops.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve one kind or several kinds that prior art has technical problem, provide a battery system locking mechanism and battery package.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a battery system locking mechanism, includes fixed loop bar and first nut, be equipped with the first external screw thread section of wearing out battery package casing top cap on the lateral wall of fixed loop bar respectively, the first external screw thread section and the first nut adaptation threaded connection of fixed loop bar.

The utility model has the advantages that: the first external thread section is arranged on the outer side wall of the fixed loop bar penetrating out of the top cover of the battery pack shell, and the first nut and the first external thread section can be connected in a threaded manner to realize the compression fixation with the top cover of the battery pack shell, so that the problem that the torque force of a bolt is easy to attenuate when the internal thread connection is adopted at present is solved; compared with the prior art, one part is eliminated, the number of processing parts is reduced, the processing assembly manufacturing cost is reduced, and an economical mechanism is provided; the first nut of the utility model can adopt a standard nut, thereby reducing the processing cost, simplifying the assembly mode and avoiding the deviation of the processing position degree; the utility model discloses an external screw thread connection makes the external diameter size of fixed loop bar reduce, has let out the module space between the roof beam structure, has increased the electrical safety distance.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, be equipped with the round ring channel on the lateral wall of fixed loop bar, the ring channel is close to first external screw thread section arranges, the ring channel endotheca be equipped with first nut cooperation carries out the sealing washer sealed to battery package casing top cap.

The beneficial effect of adopting the further scheme is that: through set up the sealing washer on the lateral wall at fixed loop bar, can realize sealing up battery case body top cap inside wall or lateral wall through screwing up first nut.

Further, an annular step for placing the sealing ring or the top cover of the battery pack shell is formed on the outer side wall of the fixed sleeve rod and close to the sealing ring, and the radial size of the annular step is larger than that of the first external thread section.

The beneficial effect of adopting the further scheme is that: the formation of the annular step can be realized by reducing the outer diameter size to form a first external thread section, and then the annular groove is arranged at the position adjacent to the annular step. By arranging the annular step, effective structural support is provided for the sealing ring or the top cover of the battery can shell conveniently.

Furthermore, the outer side wall of the fixed loop bar is also provided with an anti-rotation surface which extends and is arranged along the axial direction parallel to the fixed loop bar.

The beneficial effect of adopting the further scheme is that: the anti-rotation surface is arranged, the anti-rotation surface can be matched with the assembly hole in the battery pack body to form a limiting structure, the situation that the assembly and the vehicle run in a matched mode are not loosened is avoided, the damage to the fixing bolt is avoided, and the potential danger that the battery pack falls off is prevented. The anti-rotation surface can effectively improve the connection stability, prevent the inherent fit clearance in the running process of the vehicle from moving up and down and back and forth due to the vibration of the vehicle, improve the fatigue resistance between the battery pack body and the bottom frame of the battery pack shell, and prolong the service life of the battery pack.

Further, the outer side wall of the fixed loop bar is further provided with an annular limiting step matched with a limiting groove of the bottom frame of the battery pack shell, and the annular limiting step comprises an outer limiting step surface abutted against the bottom wall of the limiting groove, an outer peripheral side surface matched with the groove side wall of the limiting groove and an inner limiting step surface abutted against the head of the fixing bolt.

The beneficial effect of adopting the further scheme is that: through setting up the spacing step of annular, can carry out the adaptation joint with the spacing groove on the battery pack casing underframe, can effectively improve linking stability, prevent that the vehicle from traveling the inherent fit clearance of in-process because the upper and lower drunkenness around that the vehicle vibration arouses, promoted the anti fatigue strength between battery pack body and the battery pack casing underframe simultaneously, increase battery pack life.

Further, the peripheral side face of the annular limiting step is a conical face.

The beneficial effect of adopting the further scheme is that: through adopting the conical surface, be favorable to quick the leading-in battery package casing underframe of pegging graft, improve assembly efficiency and precision.

Further, still include the extension loop bar, be equipped with on the inside wall of extension loop bar one end with first external screw thread section threaded connection's internal thread section, be equipped with on the lateral wall of the extension loop bar other end with first nut adaptation threaded connection's second external screw thread section.

The beneficial effect of adopting the above further scheme is: through setting up the extension loop bar, can adopt the internal thread form to adjust or replace and accept or give up according to the needs of assembly, realize the regulation degree of freedom of the height of flexible direction.

Further, still include the stop collar, stop collar detachably cover is established on the first external screw thread section, the stop collar is by spacing adjacent at fixed loop bar the position of first external screw thread section, the extension loop bar pass through internal thread section with first external screw thread section threaded connection and butt are in on the stop collar.

The beneficial effect of adopting the above further scheme is: the lengthened loop bar is limited by the limiting sleeve, so that the situation that the lengthened loop bar is not tightly connected with the first external thread section and the thread end is exposed when the lengthened loop bar is adjusted is avoided.

The utility model provides a battery pack, includes foretell battery system locking mechanism, still includes the battery pack body, the battery pack body includes battery pack casing top cap and battery pack casing underframe, fixed loop bar runs through battery pack casing top cap and battery pack casing underframe are arranged, fixed loop bar is worn out the one end of battery pack casing top cap is connected with first nut through first external screw thread section, first nut crimping is in on the battery pack casing top cap.

The utility model has the advantages that: the utility model discloses a battery package adopts above-mentioned battery system locking mechanism, can realize the stable connection assembly of battery package.

And the fixing bolt axially penetrates through the middle cavity of the fixing sleeve rod, and one end of the fixing bolt extending out of the fixing sleeve rod is used for connecting a hoisting beam through a second nut.

The beneficial effect of adopting the further scheme is that: can realize the stable assembly between battery package body and the hoist and mount roof beam.

Drawings

Fig. 1 is a schematic front view of the battery system locking mechanism of the present invention;

FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1;

fig. 3 is a schematic side view of the battery system locking mechanism of the present invention;

fig. 4 is a schematic diagram of a three-dimensional explosion structure of embodiment 1 of the locking mechanism of the battery system of the present invention;

fig. 5 is a schematic view of a front view explosion structure of embodiment 2 of the locking mechanism of the battery system of the present invention;

fig. 6 is a schematic diagram of a three-dimensional explosion structure of embodiment 2 of the locking mechanism of the battery system of the present invention;

fig. 7 is a schematic perspective view of a part of the battery pack of the present invention;

FIG. 8 is a schematic cross-sectional view of A-A of FIG. 7;

FIG. 9 is an enlarged view of portion A of FIG. 8;

fig. 10 is a schematic view of the internal structure of the battery pack of the present invention;

fig. 11 is an enlarged schematic view of a portion B in fig. 10.

In the drawings, the components represented by the respective reference numerals are listed below:

1. fixing the loop bar; 11. a first external thread section; 12. an annular groove; 13. a seal ring; 14. an annular step; 15. surface rotation prevention; 16. an annular limiting step; 17. an outer limit step surface; 18. an inner limit step surface; 19. a peripheral side surface;

2. a first nut;

3. lengthening the loop bar; 31. a second outer thread section;

4. a limiting sleeve;

5. a battery pack body; 51. a battery can housing top cap; 52. a battery can body bottom frame;

6. fixing the bolt; 7. hoisting the beam; 8. a second nut.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 1 to 11, the locking mechanism of a battery system of the present embodiment includes a fixed loop bar 1 and a first nut 2, wherein the outer side wall of the fixed loop bar 1 is respectively provided with a first external thread section 11 penetrating through a top cover 51 of a battery pack housing, and the first external thread section 11 of the fixed loop bar 1 is in threaded connection with the first nut 2.

The locking mechanism of this embodiment, fixed loop bar adopt an organic whole, and first nut directly uses standard nut and need not to carry out secondary operation, has reduced part quantity, has reduced the processing degree of difficulty, has improved the machining precision, has avoided concentricity processing requirement deviation, has reduced manufacturing procedure, has improved productivity and assembly efficiency, directly has reduced production and product cost. Fixed loop bar top sets up first nut for traditional bolted connection mode, has improved joint torsion, avoids screw center secondary location trompil deviation, simplifies the design, avoids destroying screw surface coating, has improved corrosion resistance and salt fog characteristic.

As shown in fig. 2, an alternative of this embodiment is that a ring of annular grooves 12 are provided on the outer side wall of the fixing sleeve rod 1, the annular grooves 12 are arranged adjacent to the first external thread section 11, and the annular grooves 12 are internally sleeved with a sealing ring 13 which cooperates with the first nut 2 to seal the battery pack housing top cover 51. Through set up the sealing washer on the lateral wall at fixed loop bar, can realize sealing up battery can casing top cap inside wall or lateral wall through screwing up first nut. The sealing ring is arranged in the annular groove, so that the sealing ring is not easy to loosen, and the sealing effect can be more effectively realized when the top cover of the battery pack shell is pressed.

Specifically, market standard O type sealing washer can be chooseed for use to the sealing washer of this embodiment, reduces manufacturing cost, avoids the processing deviation to lead to sealed inefficacy.

As shown in fig. 2, in a preferred embodiment of the present invention, an annular step 14 for placing a sealing ring 13 or a battery can top cover 51 is further formed on the outer side wall of the fixing stem 1 adjacent to the sealing ring 13, and the radial dimension of the annular step 14 is larger than that of the first external thread section 11. The formation of the annular step can be realized by reducing the outer diameter size to form a first external thread section, and then the annular groove is arranged at the position adjacent to the annular step. By arranging the annular step, effective structural support is provided for the sealing ring or the top cover of the battery can shell conveniently.

As shown in fig. 3 and 4, preferably, the outer side wall of the fixed sleeve rod 1 is further provided with an anti-rotation surface 15 extending in a direction parallel to the axial direction of the fixed sleeve rod 1. The anti-rotation surface is arranged, the anti-rotation surface can be matched with the assembly hole in the battery pack body to form a limiting structure, the situation that the assembly and the vehicle run in a matched mode are not loosened is avoided, the damage to the fixing bolt is avoided, and the potential danger that the battery pack falls off is prevented. The anti-rotation surface can effectively improve the connection stability, prevent the inherent fit clearance in the running process of the vehicle from moving up and down and back and forth due to the vibration of the vehicle, improve the fatigue resistance between the battery pack body and the bottom frame of the battery pack shell, and prolong the service life of the battery pack.

As shown in fig. 1 to 6, another alternative of this embodiment is that an annular limiting step 16 adapted to the limiting groove of the battery pack body bottom frame 52 is further provided on the outer side wall of the fixing loop bar 1, and the annular limiting step 16 includes an outer limiting step surface 17 abutting against the groove bottom wall of the limiting groove, an outer peripheral side surface 19 adapted to the groove side wall of the limiting groove, and an inner limiting step surface 18 abutting against the head of the fixing bolt 6. Through setting up the spacing step of annular, can carry out the adaptation joint with the spacing groove on the battery pack casing underframe, can effectively improve linking stability, prevent that the vehicle from traveling the inherent fit clearance of in-process because the upper and lower drunkenness around that the vehicle vibration arouses, promoted the anti fatigue strength between battery pack body and the battery pack casing underframe simultaneously, increase battery pack life.

One or more anti-rotation surfaces 15 can be provided in the embodiment, and the size of the anti-rotation surface 15 can be set to different sizes according to different requirements. The anti-rotation surface 15 and the annular limiting step 16 can improve the connection stability.

As shown in fig. 1 to 6, in a further preferred embodiment of the present invention, the peripheral side surface 19 of the annular limiting step 14 is a tapered surface. Similarly, the limiting groove also adopts the same conical surface, and the conical surface is favorable for being rapidly inserted and guided into the bottom frame of the battery pack shell, so that the assembly efficiency and the assembly precision are improved.

When the battery system locking mechanism of this embodiment is used, with fixed loop bar embedding battery package body preset downthehole, fixed loop bar upper end card is gone into the settlement hole site of battery package body top cap, need not to align, embolia the first external screw thread section root of fixed loop bar with the sealing washer again, first nut threaded connection is on first external screw thread section, utilize first nut to compress tightly battery package body top cap, do not need extra other parts, only need fixed loop bar and the cooperation of a nut just can realize compressing tightly fixedly of battery package body top cap, torsion is greater than traditional locking mechanism's bolt, and the joint strength has been improved, because fixed loop bar directly card is gone into battery package body top cap, keep connecting and do not have the clearance of rocking in the vehicle advancing direction, improve chassis connection reliability and stability.

In the embodiment, the first external thread section is arranged on the outer side wall of the fixing sleeve rod penetrating out of the top cover of the battery pack shell, and the first nut and the first external thread section can be in threaded connection to realize the compression and fixation with the top cover of the battery pack shell, so that the problem that the torque force attenuation of a bolt is easily generated by adopting internal thread connection at present is solved; compared with the prior art, one part is eliminated, the number of processing parts is reduced, the processing assembly manufacturing cost is reduced, and an economical mechanism is provided; the first nut of the embodiment can adopt a standard nut, so that the processing cost is reduced, the assembly mode is simplified, and the deviation of the processing position degree is avoided; the external thread connection is adopted in the embodiment, so that the external diameter size of the fixing sleeve rod is reduced, the module space between beam frames is formed, and the electrical safety distance is increased.

Example 2

As shown in fig. 5 and fig. 6, on the basis of embodiment 1, the locking mechanism of the battery system provided in this embodiment further includes an elongated sleeve rod 3, an inner thread section that is in threaded connection with the first outer thread section 11 is provided on an inner side wall of one end of the elongated sleeve rod 3, and a second outer thread section 31 that is in threaded connection with the first nut 2 is provided on an outer side wall of the other end of the elongated sleeve rod 3. Through setting up the extension loop bar, can adopt the internal thread form to adjust or replace and accept or give up according to the needs of assembly, realize the regulation degree of freedom of the height of flexible direction.

Further, in order to prevent the untight connection between the extended shank and the first external thread section, the extended shank further comprises a limiting sleeve 4, wherein the limiting sleeve 4 is detachably sleeved on the first external thread section 11, the limiting sleeve 4 is limited at a position where the fixed shank 1 is adjacent to the first external thread section 11, and the extended shank 3 is in threaded connection with the first external thread section 11 through an internal thread section and abuts against the limiting sleeve 4. The lengthened loop bar is limited by the limiting sleeve, so that the situations that the lengthened loop bar is not tightly connected with the first external thread section and the thread end is exposed when the lengthened loop bar is adjusted are avoided.

Specifically, the outer side wall of the extension sleeve rod 3 of this embodiment may also be provided with a rotation-preventing surface, and after the extension sleeve rod 3 is installed on the first external thread section 11, the rotation-preventing surface on the extension sleeve rod 3 and the rotation-preventing surface on the fixed sleeve rod 1 may be in the same plane by rotating the extension sleeve rod 3. In order not to influence the assembly, the limiting sleeve 4 can also be provided with an anti-rotation surface or not, and when the limiting sleeve is not provided with the anti-rotation surface, the radial size of the limiting sleeve can be smaller than that of the anti-rotation surface of the fixed sleeve rod.

The inner side surface of the limiting sleeve 4 can be a smooth surface, and can also be a threaded surface in threaded fit with the first external thread section 11. The stop collar passes through the plain noodles and can directly overlap and establish on first external screw thread section 11, conveniently gets to put, when extension loop bar 3 twists on first external screw thread section 11, can compress tightly the stop collar. The stop collar can be screwed on the first external thread section 11 through a thread surface, and then the lengthened effect is realized by the connection of the lengthened loop bar 3 on the stop collar. The different lengthening length requirements can be met by arranging the stop sleeves 4 with different lengths.

The battery system locking mechanism of this embodiment adopts the structural style of extension loop bar, can be directed against the battery package structure of different specifications, and is more nimble reliable, and locking mechanism's commonality is stronger.

Example 3

As shown in fig. 7 to 11, the battery pack of the present embodiment includes the above-mentioned battery system locking mechanism, and further includes a battery pack body 5, where the battery pack body 5 includes a battery pack case top cover 51 and a battery pack case bottom frame 52, the fixing loop bar 1 is arranged to penetrate through the battery pack case top cover 51 and the battery pack case bottom frame 52, one end of the fixing loop bar 1, which penetrates through the battery pack case top cover 51, is connected to a first nut 2 through a first external thread section 11, and the first nut 2 is crimped on the battery pack case top cover 51.

As shown in fig. 10 and 11, a specific scheme of this embodiment is that the battery pack further includes a fixing bolt 6, where the fixing bolt 6 axially penetrates through a middle cavity of the fixing loop bar 1, and one end of the fixing bolt 6 extending out of the fixing loop bar 1 is used for connecting a hoisting beam 7 through a second nut 8. Can realize the stable assembly between battery package body and the hoist and mount roof beam.

The battery package of this embodiment adopts above-mentioned battery system locking mechanism, utilizes fixing bolt to pass the middle part cavity of fixed loop bar, directly fixes with battery package body underframe, and it is great if discover the underframe clearance, and the accessible is adjusted the second nut and is adjusted the underframe clearance, need not to dismantle fixing bolt, can realize the stable connection assembly and the assembly efficiency of battery package.

In the description of the present invention, it is to be understood that the terms "center", "length", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", "axial", "radial", and the like, are used in the positional or positional relationship indicated in the drawings, which are for convenience of description and simplicity of description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. The utility model provides a battery system locking mechanism, its characterized in that includes fixed loop bar (1) and first nut (2), be equipped with first external screw thread section (11) of wearing out battery can casing top cap (51) on the lateral wall of fixed loop bar (1) respectively, first external screw thread section (11) and first nut (2) adaptation threaded connection of fixed loop bar (1).

2. The battery system locking mechanism according to claim 1, wherein a ring of annular groove (12) is provided on the outer side wall of the fixing loop bar (1), the annular groove (12) is arranged adjacent to the first external thread section (11), and the annular groove (12) is internally sleeved with a sealing ring (13) which is matched with the first nut (2) to seal the battery pack top cover (51).

3. The battery system locking mechanism according to claim 2, wherein an annular step (14) for placing the sealing ring (13) or the battery pack top cover (51) is further formed on the outer side wall of the fixing sleeve rod (1) adjacent to the sealing ring (13), and the radial dimension of the annular step (14) is larger than that of the first external thread section (11).

4. The battery system locking mechanism according to claim 1, wherein the outer side wall of the fixed loop bar (1) is further provided with an anti-rotation surface (15) extending in a direction parallel to the axial direction of the fixed loop bar (1).

5. The battery system locking mechanism according to claim 1, wherein the outer side wall of the fixed loop bar (1) is further provided with an annular limiting step (16) matched with a limiting groove of the battery pack shell bottom frame (52), and the annular limiting step (16) comprises an outer limiting step surface (17) abutted with the groove bottom wall of the limiting groove, an outer peripheral side surface (19) matched with the groove side wall of the limiting groove, and an inner limiting step surface (18) abutted with the head of the fixing bolt (6).

6. The battery system locking mechanism according to claim 5, wherein the peripheral side surface (19) of the annular restraining step (16) is a tapered surface.

7. The battery system locking mechanism according to claim 1, further comprising an elongated sleeve rod (3), wherein an inner side wall of one end of the elongated sleeve rod (3) is provided with an inner thread section in threaded connection with the first outer thread section (11), and an outer side wall of the other end of the elongated sleeve rod (3) is provided with a second outer thread section (31) in threaded connection with the first nut (2).

8. The battery system locking mechanism according to claim 7, further comprising a limiting sleeve (4), wherein the limiting sleeve (4) is detachably sleeved on the first external thread section (11), the limiting sleeve (4) is limited at a position where the fixed sleeve rod (1) is adjacent to the first external thread section (11), and the extended sleeve rod (3) is in threaded connection with the first external thread section (11) through an internal thread section and abuts against the limiting sleeve (4).

9. A battery pack, comprising the battery system locking mechanism of any one of claims 1 to 8, further comprising a battery pack body (5), wherein the battery pack body (5) comprises a battery pack shell top cover (51) and a battery pack shell bottom frame (52), the fixing loop bar (1) is arranged through the battery pack shell top cover (51) and the battery pack shell bottom frame (52), one end of the fixing loop bar (1) penetrating out of the battery pack shell top cover (51) is connected with a first nut (2) through a first external thread section (11), and the first nut (2) is crimped on the battery pack shell top cover (51).

10. The battery pack according to claim 9, further comprising a fixing bolt (6), wherein the fixing bolt (6) axially penetrates through the middle cavity of the fixing loop bar (1), and one end of the fixing bolt (6) extending out of the fixing loop bar (1) is used for connecting the hoisting beam (7) through a second nut (8).

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