CN220628096U - Battery pack and electricity utilization device - Google Patents

Abstract

The embodiment of the utility model discloses a battery pack and an electric device, which comprises: the lower box body is provided with a containing chamber; the battery cell group is accommodated in the accommodating chamber, and a filling space is formed between the battery cell group and the lower box body; the anti-overflow piece is installed to the filling space and abuts against the lower box body and the battery cell group, the anti-overflow piece is provided with a glue injection cavity penetrating through the anti-overflow piece along the first direction, and glue is filled and solidified in the glue injection cavity. According to the utility model, the overflow preventing piece is arranged and the solidified colloid is filled in the glue injecting cavity of the overflow preventing piece, so that the solidified colloid provides pretightening force for the battery cell group to ensure the cycle life of the battery cell, and the overflow preventing piece can prevent the overflow of the colloid in the filling process from influencing the appearance and the performance of the battery pack.

Description

Battery pack and electricity utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack and an electric device.

Background

Under the requirement of sustainable development of energy, along with the increasing development of new energy technology, the battery pack is taken as a green energy source, can greatly reduce emission of greenhouse gases, plays a very important role in environmental protection, and is more and more closed by people.

In the process of continuously pursuing the energy density and the volume density of the battery pack, the CTP (Cell To Pack) scheme of the battery pack is widely applied, namely, the battery cells are directly integrated into the battery pack, and the step of forming the module by the battery cells is omitted, so that the connecting structural member in the process of forming the module is removed, and the energy density of the power battery is improved.

However, this CTP scheme, while increasing the energy density and bulk density of the battery pack, ignores the pre-tension force required by the cells, which can have a greater impact on cell cycle life.

Disclosure of Invention

The embodiment of the utility model provides a battery pack and an electricity utilization device, which are used for providing pretightening force for an electric core so as to ensure the service life of the electric core.

In order to solve the technical problems, the embodiment of the utility model discloses the following technical scheme:

in one aspect, there is provided a battery pack including:

a lower case having a receiving chamber;

the battery cell group is accommodated in the accommodating chamber, and a filling space is formed between the battery cell group and the lower box body; and

the overflow preventing piece is mounted to the filling space and abuts against the lower box body and the battery cell group, and the overflow preventing piece is provided with a glue injection cavity penetrating through the overflow preventing piece along a first direction; glue is filled and solidified in the glue injection cavity, and the first direction is the thickness direction of the overflow preventing piece.

In addition to or in lieu of one or more of the features disclosed above, the receiving chamber has an opening through which the battery cell stack is received into the receiving chamber, and the side of the spill guard that faces the opening has an opening that communicates with the glue injection cavity.

In addition to or in lieu of one or more of the features disclosed above, the spill guard includes an elastomer and a coating over an outer surface of the elastomer;

and the coating film at least coats the surface of the elastomer, which is contacted with the lower box body and the battery cell.

In addition to or in lieu of one or more of the features disclosed above, the cover film has a coefficient of friction that is less than that of the elastomer.

In addition to or in lieu of one or more of the features disclosed above, the lower housing has a second direction that intersects the first direction, the lower housing includes a bottom panel, a shroud extending in the first direction, and a side panel extending in the second direction, the shroud, side panel, and bottom panel circumscribing the receiving chamber.

In addition to or in lieu of one or more of the features disclosed above, the side plate is provided with a glue overflow port in fluid communication with the glue injection cavity.

In addition to or in lieu of one or more of the features disclosed above, at least one stringer is disposed within the containment chamber, the stringer extending in a first direction until secured to the side panel, the containment chamber being divided into at least two sub-containment chambers by the at least one stringer.

In addition to or in lieu of one or more of the features disclosed above, the battery pack further comprises:

a high voltage harness;

the high-voltage support is detachably arranged on one side, far away from the battery cell group, of the side plate, the high-voltage wire harness is electrically connected with the battery cell group through the high-voltage support, and the high-voltage support and the glue overflow openings are distributed at intervals along the first direction.

In addition to or in lieu of one or more of the features disclosed above, the high pressure mount includes:

a connecting plate;

the mounting seat is fixedly connected with the connecting plate, a bayonet is arranged on one surface of the mounting seat facing the side plate, a clamping piece is arranged on one surface of the side plate away from the battery cell group, the mounting seat is mounted to the clamping piece through bayonet matching, and the clamping piece and the glue overflow opening are distributed at intervals along the first direction.

In addition to or in lieu of one or more of the features disclosed above, the web edge has a plurality of spaced apart supports, the high voltage wire harness being threaded between adjacent ones of the supports.

In addition to or in lieu of one or more of the features disclosed above, the high pressure bracket may further comprise a staple having a staple hole in a side of the mount facing the lower housing, the staple being threaded through the side plate and the staple hole.

In addition to or in lieu of one or more of the features disclosed above, the battery pack further comprises:

a screw;

one end of the wiring lug is electrically connected with the battery cell group, and the other end of the wiring lug is electrically connected with the high-voltage wire harness on the high-voltage support;

at least two screw holes are formed in the connecting plate, and the screws penetrate through the wiring lugs and are screwed with the screw holes.

In another aspect, there is further disclosed an electrical device comprising the battery pack of any one of the above, the battery pack serving as a power supply for the electrical device.

One of the above technical solutions has the following advantages or beneficial effects: this application sets up the anti-overflow piece and fills solidification colloid at the injecting glue intracavity of filling at anti-overflow piece through the both ends at electric core group to the colloid after making the solidification provides pretightning force in order to guarantee the cycle life of electric core to electric core group, and the anti-overflow piece can avoid the overflow of colloid and influence outward appearance and the performance of this application in the filling process.

Drawings

The technical solution and other advantageous effects of the present utility model will be made apparent by the following detailed description of the specific embodiments of the present utility model with reference to the accompanying drawings.

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

FIG. 2 is an enlarged schematic view at A in FIG. 1;

fig. 3 is an exploded view of a battery pack according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of the overflow preventing member, the gel and the lower case in the battery pack according to the embodiment of the utility model;

fig. 5 is a schematic diagram showing a disassembled structure of an overflow preventing member in a battery pack according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a configuration of a spill guard in a battery pack in accordance with an embodiment of the present utility model in cooperation with a spill guard mounting device;

FIG. 7 is an enlarged schematic view at B in FIG. 3;

fig. 8 is a schematic structural view of a high-voltage support in a battery pack according to an embodiment of the present utility model;

fig. 9 is a rear view of a high voltage cradle in a battery pack provided in accordance with an embodiment of the present utility model;

fig. 10 is a cross-sectional view of a battery pack according to an embodiment of the present utility model after a high-voltage support and a clip are mated.

In the figure: 10-cell groups; 100-cell columns; 110-cell; 120-an electrical connection pad; 121-a lug;

200-lower box body; 210-side plates; 211-glue overflow port; 212-clamping piece; 213-mounting holes; 220-a bottom plate; 230-coaming; 240-stringers;

300-spill-proof member; 310-an elastomer; 301-injecting glue cavity; 320-coating; 321-side membrane; 322-bottom mask;

400-colloid;

500-high pressure support; 510-connecting plates; 511-screw holes; 512-support; 520-mount; 521-bayonet; 522-staple holes;

600-spill guard mounting means; 610-grip.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and detailed description. It should be understood that the detailed description is intended to illustrate the utility model, and not to limit the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "plurality" means two or more, unless specifically defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

The term "parallel" in the present application includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering, for example, "parallel" refers to a state in which straight lines form an angle of-1 ° to 1 ° with respect to straight lines, straight lines form an angle of plane with respect to plane, or plane with respect to plane; meanwhile, "vertical" includes not only the case of absolute vertical but also the case of substantially vertical as conventionally recognized in engineering, for example, "vertical" refers to a state in which an angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89 ° to 91 °. The distances are equal or the angles are equal, not only the absolute equal condition is included, but also the general equal condition of the conventional cognition in engineering is included, and certain errors can exist, such as a state that the tolerance range is between-1% and 1%.

Referring to fig. 1 to 3, fig. 1 shows a schematic structural diagram of a battery pack according to an embodiment of the present application, where the battery pack according to an embodiment of the present application includes: the battery cell group 10, the lower box 200, the anti-overflow piece 300, the colloid 400 and the high-voltage support 500, wherein the colloid 400 can be pouring sealant or structural adhesive. The battery cell group 10 is arranged in the accommodating chamber in the lower box body 200, a filling space is formed between the battery cell group 10 and the lower box body 200, in order to ensure the pretightening force of the battery cell 110 in the battery cell group 10, an overflow preventing member 300 is arranged in the filling space, the overflow preventing member 300 is abutted against the lower box body 200 and the battery cell group 101, the overflow preventing member 300 is provided with a glue injecting cavity 301 penetrating through the overflow preventing member 300 along the first direction x, the glue 400 is filled and solidified in the glue injecting cavity 301, and the solidified glue 400 is abutted against the battery cell group 10 and the lower box body 200 to provide pretightening force for the battery cell 110 so as to ensure the service life of the battery cell 110. The high voltage support 500 is disposed in the lower case 200 at a position close to the battery pack 10, the arrangement line of the high voltage wire harness (not shown) in the battery pack passes through the high voltage support 500, the connection tab 121 of the battery pack 10 is electrically connected with the high voltage wire harness on the high voltage support 500, and the high voltage support 500 provides a space for connecting the high voltage wire harness with the connection tab 121 of the battery pack 10, so as to ensure the safe connection of the high voltage circuit in the battery pack. The first direction x may be a thickness direction of the spill-proof member 300, and the direction is parallel to a direction of the pre-tightening force required by the cell assembly 10.

As shown in fig. 3, the battery pack in the drawing has a first direction x and a second direction y which are intersected, specifically, the first direction x and the second direction y are perpendicular, the battery cell group 10 includes a plurality of battery cell columns 100 sequentially arranged along the second direction y, each battery cell column 100 includes a plurality of battery cells 110 sequentially arranged along the first direction x, adjacent battery cells 110 in the same battery cell column 100 are mutually abutted, the battery cells 110 in the embodiment are all vertically arranged, and the pretightening force direction extends along the first direction x, so that the battery cells 110 in the same battery cell column 100 can mutually transmit pretightening force. The battery cells 110 have two poles for electrical connection, and the positive pole of the battery cell 110 is electrically connected with the negative pole of the adjacent battery cell 110 through the electrical connection sheet 120, so as to connect the battery cells 110 in the same battery cell row 100 in series. The battery cell 110 poles at the end of the battery cell row 100 are electrically connected with the battery cell 110 poles at the end of the adjacent battery cell row 100 through the electric connection sheet 120 so as to connect the adjacent battery cell rows 100 in series. In this embodiment, a pair of adjacent cell rows 100 are connected in series in groups, so that the loop heads of each group of cell rows 100 are all at the same end of the cell row 100, so as to facilitate the electrical connection between the cell row 100 and the high-voltage wire harness. Alternatively, three or more cell rows 100 may be connected in series or not according to the actual situation of the high voltage harness line, which is not particularly limited herein. The terminal post at the loop head of each group of the cell array 100 is provided with a terminal plate 121, and the terminal plate 121 extends from the terminal post to the high-voltage support 500 and is electrically connected with the high-voltage wire harness passing through the high-voltage support 500.

With continued reference to fig. 3, the lower case 200 has a case-type structure having a receiving chamber therein, and the lower case 200 includes: the bottom plate 220, the side plates 210 and the coaming 230 are arranged on the outer edge of the bottom plate 220 in a surrounding mode, the bottom plate 220, the side plates 210 and the coaming 230 jointly form the containing cavity, and the battery cell group 10 is arranged in the containing cavity. The side plates 210 are disposed at edges of the bottom plate 220 along the first direction x, and the coaming 230 is disposed at edges of the bottom plate 220 along the second direction y. The receiving chamber in the figure also has a vertically upward opening. The lower case 200 further has a top plate or a cabin floor corresponding to the bottom plate 220, the top plate or the cabin floor is fixedly connected with the side plate 210 and the coaming 230, and the top plate or the cabin floor, the bottom plate 220, the side plate 210 and the coaming 230 enclose together to form a sealed accommodating cavity, so as to isolate the battery cell set 10 from the outside to protect the battery cell set 10. In this embodiment, the battery packaging technology of CTP is adopted, and the top plate is fixedly installed in the opening. Alternatively, when the battery packaging solution of CTB is adopted, the cabin floor is fixedly installed at the opening, which is not particularly limited herein.

Further, the lower case 200 further includes a longitudinal beam 240, the longitudinal beam 240 is disposed in the accommodating chamber, the longitudinal beam 240 extends along the first direction x until being fixedly connected with the side plate 210, and the longitudinal beam 240 is used for improving the rigidity strength of the whole battery pack. The accommodating chamber is partitioned by the longitudinal beam 240 into a plurality of sub-accommodating chambers in which the cell array 100 is accommodated. In this embodiment, two stringers 240 are provided in the lower case 200, and the stringers 240 divide the accommodating chamber into three sub-accommodating chambers, each of which has two cell arrays 100.

Referring to fig. 4, fig. 4 shows a schematic structural diagram of the anti-overflow member 300, the gel 400 and the lower case 200 in the battery pack according to an embodiment of the present application, wherein two ends of the battery cell group 10 along the first direction x are a first end surface and a second end surface, respectively, corresponding to the side plate 210 in the lower case 200, and the thickness of the battery cell 110 along the first direction x may generate a tolerance during the production process, so that the size of the accommodating chamber of the lower case 200 along the first direction x may reserve a tolerance length for the factory of the battery cell row 100 to cause a gap between two ends of the battery cell 110 and the side plate 210, and further a filling space is formed between the first end surface and/or the second end surface and the side plate 210. The overflow preventing member 300 and the glue 400 are disposed in the filling space, the overflow preventing member 300 is abutted against the first end face or the second end face, the side plate 210 and the bottom plate 220, the overflow preventing member 300 is provided with a glue injecting cavity 301 penetrating through the body along the first direction x, and the glue 400 is filled and solidified in the glue injecting cavity 301. The anti-overflow piece 300 plays a role in enclosing and blocking isolation in the filling process of the colloid 400, avoids the loss of the colloid 400, and ensures connection between the first end face or the second end face and the side plate 210, thereby ensuring that the pretightening force of the battery cell 110 during expansion can be transmitted to the box body and ensuring the cycle life of the battery cell 110. The spill guard 300 also has an opening in communication with the glue injection cavity 301 for filling of the glue 400, the opening being oriented in the direction of the opening of the receiving chamber. In this embodiment, the cross section of the spill guard 300 in the vertical direction is U-shaped, and the opening of the spill guard 300 is vertically upward. Alternatively, the spill guard 300 may be designed to have a ring-shaped structure with a notch, etc. according to practical situations, and is not limited herein. Further, the side plate 210 is provided with a glue overflow port 211 in fluid communication with the glue injection cavity 301 at a position close to the glue injection cavity 301, so as to prevent the glue 400 from flowing out of the glue overflow port 211 after the glue injection cavity 301 is filled with the glue 400, thereby avoiding the malfunction of the battery cell 110 caused by the overflow of the glue 400 toward the battery cell group 10. In this embodiment, the glue overflow port 211 is a notch provided at the upper edge of the side plate 210. Alternatively, other structures such as a through hole penetrating the body of the side plate 210 may be provided according to the actual situation of the position of the glue injection cavity 301, which is not limited herein.

This application sets up the anti-overflow piece and fills solidification colloid at the injecting glue intracavity of filling at anti-overflow piece through the both ends at electric core group to the colloid after making the solidification provides pretightning force in order to guarantee the cycle life of electric core to electric core group, and the anti-overflow piece can avoid the overflow of colloid and influence outward appearance and the performance of this application in the filling process.

As shown in fig. 5, the spill guard 300 includes an elastic member and a cover film 320, and the cover film 320 is wrapped around the outer periphery of the elastic member. The elastic body 310 is made of elastic material with high compression ratio, so as to ensure that the anti-overflow member 300 can be installed in gaps with different sizes. The covering film 320 at least covers the surfaces of the elastic member facing the first end surface or the second end surface, the side plate 210 and the bottom plate 220, so as to avoid the loss of the colloid 400 caused by overflow of the colloid 400 in gaps between the elastic member and the first end surface or the second end surface, the side plate 210 and the bottom plate 220 in the process of filling the colloid 400 into the glue injection cavity 301, further ensure the connection between the first end surface or the second end surface and the side plate 210, and further ensure that the pretightening force generated when the battery cell 110 expands can be transmitted to the box body, and ensure the cycle life of the battery cell 110. In the present embodiment, the coating film 320 includes a side surface film 321 that contacts the first end surface or the second end surface, and a bottom surface film 322 that contacts the bottom plate 220. The surface of the cover 320 has a lower coefficient of friction than the elastomer 310 to ensure that the elastomer 310 in the spill guard 300 does not collapse due to friction with the first or second end surfaces, the side plates 210 during installation of the spill guard 300. In this embodiment, both ends of the cell array 100 are provided with the anti-overflow member 300 and the colloid 400, so as to ensure that the pretightening force applied by the solidified colloid 400 between the first end face and the second end face of the cell array 100 is uniform. Alternatively, the overflow preventing member 300 and the gel 400 may be provided on one of the first end surface and the second end surface, which is not particularly limited herein.

As shown in fig. 6, fig. 6 shows a schematic structural diagram of the overflow preventing member 300 and the overflow preventing member mounting device 600 in the battery pack according to an embodiment of the present application, where the overflow preventing member mounting device 600 is in a square plate structure adapted to the accommodating cavity, so that the overflow preventing member 300 is completely and non-deformed mounted in the filling space after the overflow preventing member mounting device 600 passes through the opening. The end of the spill guard mounting device 600 remote from the spill guard 300 further has a grip 610 penetrating the body of the spill guard mounting device 600 so that a user can grip the spill guard mounting device 600 through the grip 610 to perform a mounting process on the spill guard 300.

With continued reference to fig. 2, the high-voltage support 500 is mounted on a side of the side plate 210 away from the battery cell group 10, and the high-voltage support 500 and the glue overflow hole 211 are spaced along the first direction x, so as to avoid glue overflowing from the glue injection cavity 301 from adhering the high-voltage support 500 to the side plate 210, thereby making the disassembly of the high-voltage support 500 and the side plate 210 difficult, or avoiding glue overflowing during the assembly process from obstructing the mounting of the high-voltage support 500. Referring to fig. 7 and 8, a clamping member 212 extending along a vertical direction is disposed on a surface of the side plate 210 away from the battery cell group 10, the clamping member 212 may be in a T-shaped structure, the clamping member 212 and the side plate 210 form an i-shaped structure, the high-voltage support 500 is mounted on the clamping member 212 in a matching manner, and the clamping member 212 and the glue overflow port 211 are distributed at intervals along a first direction x. The high pressure carrier 500 includes: the high-voltage wire harness connector comprises a connecting plate 510 and a mounting seat 520, wherein the connecting plate 510 is arranged at the upper end of the mounting seat 520, the connecting plate 510 is used for connecting a high-voltage wire harness with a wire lug 121, and the mounting seat 520 is used for fixedly connecting a high-voltage support 500 with a lower box 200. The connection plate 510 is a plate-like structure that is horizontally disposed, and when the high-voltage support 500 is mounted on the clip 212, the horizontal plane of the connection plate 510 is close to the connection tab 121. The connection plate 510 has at least two screw holes 511, and a screw is threaded through the connection plate 121 to be engaged with the screw holes 511 to fixedly mount the connection plate 121 on the connection plate 510. The outer fringe of wiring board has the support piece 512 that extends towards open direction, when the open back of lower box 200 by roof or carriage floor, support piece 512 and roof or carriage floor looks butt to make the connecting plate 510 body have certain distance to form accommodation space with roof or carriage floor, above-mentioned accommodation space is used for holding high-voltage harness and lug 121, avoids high-voltage harness and lug 121 to receive the extrusion and wearing and tearing and then break down. The support 512 includes a number of spaced apart sub-supports, with gaps between adjacent sub-supports for the passage of high voltage wiring harnesses.

Referring to fig. 9 and 10, the mounting seat 520 is fixedly connected to the bottom side of the connecting plate 510, the mounting seat 520 and the connecting plate 510 are in an integrated structure, a T-shaped bayonet 521 matched with the clamping member 212 is provided at the bottom of the mounting seat 520, when the high-pressure support 500 is installed in the lower case 200, the clamping member 212 is accommodated in the bayonet 521, and the bayonet 521 of the T-shaped structure prevents the high-pressure support 500 from moving in the first direction x or the second direction y after being installed. The mounting base 520 has a clamping hole 522 near one side of the side plate 210, and the side plate 210 has a mounting hole 213 corresponding to the clamping hole 522, and the clamping pin passes through the mounting hole 213 to be combined with the clamping hole 522 Xiang Luo so as to fixedly mount the high-pressure support 500 in the lower case 200. The mounting hole 213 is a waist hole extending in the vertical direction, so as to ensure that the high-voltage support 500 has a certain floating space in the vertical direction during the mounting process, and ensure the assembly tolerance of the high-voltage wire harness.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (11)

1. A battery pack, comprising:

a lower case (200) having a housing chamber;

the battery cell group (10), the battery cell group (10) is accommodated in the accommodating chamber, and a filling space is formed between the battery cell group (10) and the lower box body (200); and

the anti-overflow piece (300), anti-overflow piece (300) install to fill the space and butt lower box (200) with electric core group (10), anti-overflow piece (300) have along first direction (x) run through glue injecting cavity (301) of anti-overflow piece (300), it has colloid (400) to fill the solidification in glue injecting cavity (301), wherein, first direction (x) is the thickness direction of anti-overflow piece (300).

2. The battery pack according to claim 1, wherein the accommodating chamber has an opening through which the battery cell group (10) is accommodated into the accommodating chamber, and a side of the overflow preventing member (300) facing the opening has an opening communicating with the glue injection chamber (301).

3. The battery pack according to claim 1, wherein the spill guard (300) comprises an elastic body (310) and a coating film (320) coated on an outer surface of the elastic body (310);

the coating film (320) at least coats the surface of the elastomer (310) contacted with the lower box body (200) and the battery cell group (10).

4. A battery pack as in claim 3, wherein the cover film (320) has a coefficient of friction that is less than that of the elastomer.

5. The battery pack according to claim 1, wherein the lower case (200) further has a second direction (y) intersecting the first direction (x), the lower case (200) includes a bottom plate (220), a shroud (230) extending in the first direction (x), and a side plate (210) extending in the second direction (y), the shroud (230), the side plate (210), and the bottom plate (220) enclosing the accommodating chamber, the side plate (210) being provided with a glue overflow port (211) in fluid communication with the glue injection cavity (301).

6. The battery pack of claim 5, wherein the battery pack further comprises:

a high voltage harness;

the high-voltage support (500) is detachably arranged on one side, away from the battery cell group (10), of the side plate (210), the high-voltage wire harness is electrically connected with the battery cell group (10) through the high-voltage support, and the high-voltage support (500) and the glue overflow opening (211) are distributed at intervals along the first direction (x).

7. The battery pack of claim 6, wherein the high voltage support (500) comprises:

a connection plate (510);

the mounting seat (520) is fixedly connected with the connecting plate (510), a bayonet (521) is arranged on one surface of the mounting seat (520) facing the side plate (210), a clamping piece (212) is arranged on one surface of the side plate (210) away from the battery cell group (10), the mounting seat (520) is matched and mounted to the clamping piece (212) through the bayonet (521), and the clamping piece (212) and the glue overflow openings (211) are distributed at intervals along the first direction (x).

8. The battery pack of claim 7, wherein the edge of the connection plate (510) has a plurality of support members (512) disposed at intervals, and the high voltage wire harness is passed between adjacent ones of the support members (512).

9. The battery pack of claim 7, wherein the high voltage support (500) further comprises a clip, wherein a side of the mounting base (520) facing the lower case (200) has a clip hole (522), and the clip passes through the side plate (210) to be screwed with the clip hole (522).

10. The battery pack of claim 9, wherein the battery pack further comprises:

a screw;

one end of the wiring lug is electrically connected with the battery cell group (10), and the other end of the wiring lug is electrically connected with the high-voltage wire harness on the high-voltage support (500);

at least two screw holes (511) are formed in the connecting plate (510), and the screws penetrate through the wiring lugs (121) to be screwed with the screw holes (511).

11. An electric device comprising the battery pack according to any one of claims 1 to 10 as a power supply source of the electric device.