CN217691420U

CN217691420U - Battery pack

Info

Publication number: CN217691420U
Application number: CN202221692829.9U
Authority: CN
Inventors: 王平
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-10-28
Anticipated expiration: 2032-06-30

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack, which comprises a box body, a current leading-out support and a sealing element, wherein the box body is provided with a cavity, the box wall of the box body is also provided with a through hole, and the through hole is communicated with the cavity; the current leading-out support is connected to the box wall and comprises a first electric connection part and a second electric connection part which are connected, the first electric connection part is exposed out of the outer surface of the box body through the through hole, and the second electric connection part is used for being electrically connected with the conductive bar of the battery pack; a groove is arranged between the current leading-out support and the box body; the sealing element is arranged in the groove and used for sealing between the current leading-out support and the box body, so that the chamber forms a sealed chamber.

Description

Battery pack

Technical Field

The utility model relates to a battery technology field particularly, relates to a battery package.

Background

The battery pack comprises a box body and a plurality of battery units arranged in an array manner and arranged in the box body, and the battery units are connected in series through a plurality of conductive bars. The plurality of conductive rows have lead-out conductive rows serving as a positive lead-out terminal and a negative lead-out terminal, respectively. The two leading-out conductive bars are electrically connected with an external electric connecting plug so as to lead out the current of the battery pack. However, since part of the current drawing support needs to be exposed on the outer surface of the case, the problem of the sealability of the case is not well solved in the related art, which affects the normal operation of the battery pack.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a can improve the battery package of leakproofness between electric current extraction support and the box.

The battery pack comprises a box body, a current leading-out support and a sealing element, wherein the box body is provided with a cavity, the box wall of the box body is also provided with a through hole, and the through hole is communicated with the cavity; the current leading-out support is connected to the box wall and comprises a first electric connection part and a second electric connection part which are connected, the first electric connection part is exposed out of the outer surface of the box body through the through hole, and the second electric connection part is used for being electrically connected with the conductive bar of the battery pack; a groove is formed between the current leading-out support and the box body; and the sealing element is arranged in the groove and used for sealing between the current leading-out support and the box body so as to enable the cavity to form a sealed cavity.

One embodiment of the above utility model has at least the following advantages or beneficial effects:

the utility model discloses battery package, sealing member locate the electric current and draw forth the ditch inslot that forms between support and the box to sealed electric current draws forth between support and the box, makes the cavity of box form sealed cavity. And the sealing performance between the box body and the current leading-out support is further ensured by the matching of the groove and the sealing piece.

Drawings

Fig. 1 is a plan view of a battery pack according to an embodiment of the present invention.

Fig. 2 is an exploded view of the battery pack according to the embodiment of the present invention.

Fig. 3 is an exploded view of the current extraction support, the upper box, the pressing plate, the sealing member and the extraction conductor bar according to the embodiment of the present invention.

Fig. 4 shows an enlarged detail of fig. 1 taken alongbase:Sub>A-base:Sub>A.

Fig. 5 is a schematic view of a current drawing support according to an embodiment of the present invention from a viewing angle.

Fig. 6 is a schematic view of a current drawing support according to an embodiment of the present invention from another viewing angle.

Fig. 7 is a cross-sectional view of a current lead-out support according to an embodiment of the present invention.

Fig. 8 shows a partially enlarged cross-sectioned view of a seal according to an embodiment of the invention.

Wherein the reference numerals are as follows:

100. battery pack

1. Box body

11. Upper box body

111. Through-hole

112. Raised part

12. Lower box body

2. Conducting bar combination

21. Conducting bar

22. Lead-out conducting bar

221. Horizontal segment

222. Vertical section

3. Battery pack

31. Battery unit

4. Battery monitoring unit

5. Mounting rack

6. Current leading-out support

61. Base seat

62. Conductive connecting sheet

621. First electrical connection part

621a, first electrical connection plane

622. Second electric connection part

622a, second electrical connection plane

63. Base portion

631. Hollow structure

632. Groove

633. Threaded hole

64. Projecting part

641. Gap

7. Sealing element

71. Deformation part

72. Limiting part

81. Pressing plate

82. Fastening piece

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a detailed description thereof will be omitted.

As shown in fig. 1 and 2, fig. 1 is a top view of a battery pack 100 according to an embodiment of the present invention. Fig. 2 is an exploded view of the battery pack 100 according to the embodiment of the present invention. The battery pack 100 according to the embodiment of the present invention includes a case 1, a busbar assembly 2, a battery pack 3, and a battery monitoring unit 4. The box body 1 is provided with a sealed chamber, and the conducting bar combination 2, the battery pack 3 and the battery monitoring unit 4 are arranged in the sealed chamber. The conductive bar assembly 2 may be disposed above the battery 3 for connecting the poles of the battery 3. The battery monitoring unit 4 is connected to the busbar assembly 2 for monitoring the battery signal of the battery pack 3.

It is understood that the battery signal may include the temperature, current, voltage, etc. of the battery.

The terms "comprising" and "having," as well as any variations thereof, in embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.

And the sealed cavity also contains cooling liquid, and the cooling liquid immerses the conductive bar combination 2, the battery pack 3 and the battery monitoring unit 4. Through the circulation flow of the cooling liquid, the heat generated by the conductive bar combination 2, the battery pack 3 and the battery monitoring unit 4 is led out, so that the heat of the conductive bar combination 2, the battery pack 3 and the battery monitoring unit 4 is dissipated.

The case 1 includes an upper case 11 and a lower case 12, and the upper case 11 and the lower case 12 are hermetically connected to form the above-mentioned sealed chamber for accommodating the busbar assembly 2, the battery pack 3 and the battery monitoring unit 4.

The battery pack 100 of the embodiment of the invention further comprises a mounting rack 5, wherein the mounting rack 5 is arranged in the sealed cavity of the box body 1 and is connected with the box body 1. The battery monitoring unit 4 is connected to a mounting bracket 5.

The battery pack 3 includes a plurality of battery cells 31, and the plurality of battery cells 31 are arranged side by side in the column direction. As an example, each battery cell 31 has a rectangular parallelepiped shape, and the width direction of each battery cell 31 is parallel to the column direction. That is, when the battery cells 31 have a rectangular parallelepiped shape, two adjacent battery cells 31 are arranged side by side with surfaces having the largest area being bonded to each other.

Of course, the plurality of battery cells 31 may be arranged side by side, and the adjacent battery cells 31 may be arranged side by side with their wide and high surfaces being in contact with each other.

In the present invention, the number of the battery packs 3 is not particularly limited, and for example, the battery packs 3 may be one set, two sets, three sets, or another number. When the number of the battery packs 3 is plural, the plural battery packs 3 are arranged side by side along a row direction, wherein the row direction is perpendicular to a column direction. Thus, the plurality of battery cells 31 form a battery array.

In the present embodiment, the battery pack 100 includes three groups of battery packs 3, the three groups of battery packs 3 being arranged side by side in the row direction. Each battery pack 3 includes a plurality of battery cells 31, and the plurality of battery cells 31 are arranged side by side in the column direction.

With continued reference to fig. 1 and fig. 2, the conducting bar assembly 2 includes a plurality of conducting bars 21, and the plurality of conducting bars 21 includes two leading-out conducting bars 22, wherein one leading-out conducting bar 22 serves as a positive leading-out terminal of the battery 3, and the other leading-out conducting bar 22 serves as a negative leading-out terminal of the battery 3.

The utility model discloses battery package 100 still includes that two electric currents draw forth support 6, and two electric currents draw forth support 6 and connect and set up on box 1, and partial electric current draws forth support 6 and appears in the surface of box 1 to make two electric currents draw forth support 6 and can be connected with the external device electricity. The two current leading-out supports 6 are respectively and correspondingly connected with the two leading-out conductive bars 22. One of the current drawing holders 6 serves as a positive electrode of the battery pack 100, and the other current drawing holder 6 serves as a negative electrode of the battery pack 100.

In this embodiment, two current drawing supports 6 are connected to the upper case 11 of the case 1, and a part of the current drawing supports 6 are exposed on the outer surface of the upper case 11.

It is understood that the external device may be a battery management system. Alternatively, when a plurality of battery packs 100 are connected in series, the external device may be another battery pack 100.

As shown in fig. 3, fig. 3 is an exploded view of the current drawing support 6, the upper case 11, the pressing plate 81, the sealing member 7 and the drawing conductor bar 22 according to the embodiment of the present invention. The box wall of the box body 1 is also provided with a through hole 111, and the through hole 111 is communicated with the sealed chamber. The current extraction support 6 is disposed corresponding to the through hole 111 and connected to the case 1.

In the present embodiment, the through-hole 111 is provided on the upper case 11, and the through-hole 111 penetrates through two opposite surfaces of the upper case 11 in the thickness direction. The current lead-out support 6 is connected with the upper box body 11.

Of course, in other embodiments, the through hole 111 may be provided in the side wall of the case 1.

The upper case 11 has a boss 112 projecting in a direction away from the sealed chamber, a through hole 111 is opened in the boss 112, and the current drawing support 6 is connected to the boss 112. Since the boss 112 protrudes in a direction away from the sealed chamber, the area covered by the boss 112 can form a space for accommodating part of the current lead-out support 6. Thus, when the current drawing support 6 is connected to the inner wall surface of the boss 112, the volume of the sealed chamber is not excessively occupied, and interference between the current drawing support 6 and other devices in the case 1 is avoided.

As shown in fig. 4 and 5, fig. 4 is an enlarged partial view of fig. 1 taken alongbase:Sub>A-base:Sub>A. Fig. 5 shows a schematic view of the current drawing support 6 according to an embodiment of the present invention from one viewing angle. The current leading-out support 6 comprises a base 61 and a conductive connecting sheet 62 partially embedded in the base 61, the conductive connecting sheet 62 comprises a first electrical connection portion 621 and a second electrical connection portion 622, the first electrical connection portion 621 is exposed on the outer surface of the base 61 and exposed on the outer surface of the box body 1 through the through hole 111, the first electrical connection portion 621 is used for being electrically connected with an external device, and the second electrical connection portion 622 is exposed on the outer surface of the base 61 and electrically connected with the leading-out conductive bars 22 of the plurality of conductive bars 21.

It is understood that the first and second

electrical connection portions

621 and 622 may be a unitary structure.

The current leading support 6 comprises a base 61 and a conductive connecting sheet 62 partially embedded in the base 61, a first electric connection part 621 of the conductive connecting sheet 62 is exposed on the outer surface of the box body 1, a second electric connection part 622 of the conductive connecting sheet 62 is exposed on the outer surface of the base 61, the first electric connection part 621 can be electrically connected with an external device, the second electric connection part 622 can be electrically connected with the leading conductive bar 22, and therefore current of the battery pack 3 can be led out through the current leading support 6. Part of the conductive connecting sheet 62 is embedded in the base 61, so that the connection between the base 61 and the conductive connecting sheet 62 is more stable, and the electrical connection stability between the first electrical connection portion 621 and an external device, and between the second electrical connection portion 622 and the lead-out conductive bar 22 are further improved.

It will be appreciated that the base 61 and the conductive tabs 62 may be of unitary injection molded construction. The current leading-out support 6 is formed by adopting an integral injection molding process, so that the processing is more convenient, and the forming efficiency is improved. And, the base 61 and the conductive connecting piece 62 are firmly connected by integral injection molding.

In one embodiment, the material of the base 61 may be polyphthalamide or polyhexamethylene adipamide. The polyphthalamide or polyhexamethylene adipamide has high temperature resistance, when current passes through the conductive connecting sheet 62 of the current leading support 6, high heat can be generated, the base 61 made of the polyphthalamide or polyhexamethylene adipamide material can bear high temperature without deformation, the connection stability of the base 61 and the conductive connecting sheet 62 is further ensured, and finally the electrical connection stability of the first electrical connection part 621 and an external device and the electrical connection stability of the second electrical connection part 622 and the leading conductive bar 22 are ensured.

With continued reference to fig. 4 and 5, the base 61 includes a base portion 63 and a projection 64. The base portion 63 is connected to the inner wall of the box body, part of the conductive connecting sheet 62 is embedded in the base portion 63, the first electrical connection portion 621 is exposed on one side surface of the base portion 63 connected with the box body 1, and the second electrical connection portion 622 is exposed on the side surface of the base portion 63. The protrusion 64 is protruded from a side surface of the base portion 63 having the first electrical connection portion 621, and the protrusion 64 passes through the through hole 111 and is exposed out of the outer surface of the box 1.

Specifically, the protruding portion 64 is exposed to the outer surface of the case 1 through the through hole 111 of the upper case 11. The base portion 63 is connected to the inner wall surface of the upper case 11 at the side where the protrusion 64 is protruded. The first electrical connection portion 621 is disposed on one side of the base portion 63 where the protrusion portion 64 protrudes, and the first electrical connection is exposed to the outer surface of the case 1 through the through hole 111 of the upper case 11. The second electrical connection portion 622 is provided on a side surface of the base body 63, which is connected to a side surface of the base body 63 on which the projection 64 is projected. And, a second electrical connection portion 622 is located inside the upper case 11 for connection with the lead out conductor bar 22.

The projection 64 surrounds the first electrical connection portion 621. The protrusion 64 has a notch 641, and the notch 641 is used for avoiding an electrical connector (not shown), wherein the first electrical connector 621 is connected with an external device through the electrical connector.

As shown in fig. 6, fig. 6 is a schematic view of the current extraction support 6 according to the embodiment of the present invention from another view angle. The base part 63 is provided with a cutout 631 on the side facing away from the projection 64. On the other hand, the provision of the cutout 631 reduces the weight of the base body 63 itself. On the other hand, the material of the base body 63 can be saved, and the material cost can be saved.

As shown in fig. 4, 5 and 7, fig. 7 is a sectional view of the current drawing support 6 according to the embodiment of the present invention. The first electrical connection portion 621 has a first electrical connection plane 621a, and the first electrical connection plane 621a is used for being attached to an electrical connection member. Since the first electrical connection plane 621a is a plane and is attached to the electrical connection member, the contact area between the first electrical connection portion 621 and the electrical connection member is large, and the stability of connection between the first electrical connection portion 621 and the electrical connection member is ensured. The first electrical connection portion 621 and the electrical connection member may be connected by a bolt so that the first electrical connection plane 621a and the electrical connection member can be closely attached.

The second electrical connection portion 622 has a second electrical connection plane 622a, and the second electrical connection plane 622a is used for being attached to the lead bar 22. Since the second electrical connection plane 622a is a plane and is attached to the lead-out busbar 22, the contact area between the second electrical connection part 622 and the lead-out busbar 22 is large, and the stability of connection between the second electrical connection part 622 and the lead-out busbar 22 is ensured. The second electrical connection portion 622 and the lead bar 22 may be connected by a bolt, so that the second electrical connection plane 622a and the lead bar 22 can be closely attached.

As shown in fig. 3 and 4, the first electrical connection plane 621a and the second electrical connection plane 622a are perpendicular to each other. The lead out conductor bar 22 includes a horizontal section 221 and a vertical section 222, and the horizontal section 221 is used for electrical connection with the battery pack 3. The vertical section 222 is connected to the horizontal section 221 and perpendicular to the horizontal section 221, and the vertical section 222 is attached to the second electrical connection plane 622a and connected thereto by bolts.

The battery pack 100 of the embodiment of the present invention further includes a pressing plate 81 and a fastening member 82. The pressure plate 81 is connected to the outer surface of the upper case 11, the peripheral edge region of the through hole 111 of the upper case 11 is interposed between the pressure plate 81 and the base portion 63, and the fastening member 82 fastens the pressure plate 81, the upper case 11, and the base portion 63.

In one embodiment, the pressing plate 81 has a ring shape and surrounds the outer circumference of the protrusion 64 of the current lead-out support 6.

In one embodiment, the fasteners 82 may be bolts. The pressing plate 81 and the protruding portion 112 of the upper case 11 are provided with through holes, one side of the base portion 63 provided with the protruding portion 64 is provided with a threaded hole 633, and the fastening member 82 sequentially passes through the pressing plate 81 and the through holes of the upper case 11 and is screwed with the threaded hole 633 of the base portion 63, so that the current leading-out support 6 is fastened and connected with the upper case 11.

With reference to fig. 3 to 5, the battery pack 100 of the embodiment of the invention further includes a sealing member 7. A groove 632 is formed between the current leading support 6 and the box body, and a sealing piece 7 is arranged in the groove 632 and used for sealing between the current leading support 6 and the box body, so that the chamber forms a sealed chamber.

A sealing member 7 is provided in a groove 632 formed between the current lead-out support 6 and the case 1 to seal between the current lead-out support 6 and the case 1 so that the chamber of the case 1 forms a sealed chamber. By the cooperation of the groove 632 and the seal 7, the sealability between the case 1 and the current lead-out support 6 is further ensured.

The groove 632 has various embodiments at a position formed between the current drawing support 6 and the case 1. For example, the groove 632 may be formed between the base body portion 63 and the inner wall surface of the case 1, or the groove 632 may be formed between the protrusion 64 and the wall surface of the through hole 111.

In the present embodiment, the groove 632 is provided between the base body portion 63 and the inner wall surface of the case 1. Specifically, the groove 632 is provided between the base portion 63 and the inner wall surface of the upper case 11.

When the groove 632 is disposed between the base portion 63 and the inner wall surface of the box 1, the groove 632 may be disposed on one side of the base portion 63 connected to the box 1, or the groove 632 is disposed on the inner wall surface of the box 1, or the base portion 63 has a first groove, the inner wall surface of the box 1 has a second groove, and the first groove and the second groove are disposed at corresponding positions and jointly form the groove 632.

The groove 632 is an annular groove, and the groove 632 surrounds the projection 64 of the current lead-out support 6. The seal 7 is annular and surrounds the projection 64.

Of course, in some embodiments, the shape of the groove 632 may also be arcuate. The base portion 63 is provided with a plurality of arc-shaped grooves 632, and the plurality of grooves 632 extend along the circumferential direction of the projection 64. In order to ensure the sealing property, the adjacent two grooves 632 have an overlapping portion in the radial direction in the circumferential direction.

The orthographic projection of the seal 7 to the surface of the base portion 63 on which the protrusion 64 is provided falls within the orthographic projection of the platen 81 to the surface of the base portion 63. In other words, the position of the seal 7 is arranged to correspond exactly to the position of the pressure plate 81 along the thickness direction of the pressure plate 81, so that when the pressure plate 81, the upper case 11, and the base portion 63 are fastened by the fastening members 82, the pressing force applied by the pressure plate 81 can act vertically on the seal 7, so that the seal 7 is interposed between the base portion 63 and the pressure plate 81 and the upper case 11, further ensuring the sealing property.

As shown in fig. 8, fig. 8 is a partially enlarged cross-cut view of the sealing member 7 according to the embodiment of the present invention. The sealing member 7 is an elastic member having elasticity. The current leading-out support 6 is connected with the box body 1, the sealing piece 7 is clamped between the current leading-out support 6 and the box body 1, and the sealing piece 7 can be compressed to generate deformation so as to realize sealing.

The seal 7 includes deformation portions 71 provided in pairs, and the deformation portions 71 in pairs are configured to be deformed by being pressed by the current extraction holder 6 and the case to achieve sealing when the current extraction holder 6 is connected to the inner wall surface of the case 1.

In the present embodiment, the two deformation portions 71 are deformed when being pressed, and each deformation portion 71 can achieve sealing. In other words, the two deformations 71 are pressed to achieve a two-layer seal, which further improves the sealing property.

It is understood that the deformation portions 71 provided in pairs may be provided only at one end of the seal member 7 in the height direction thereof. Of course, both opposite ends of the sealing member 7 are provided with a pair of deformations 71.

The sealing element 7 further comprises a limiting part 72, and the limiting part 72 is arranged on the side surface of the sealing element 7 in a protruding mode. When the sealing member 7 is disposed in the groove 632, the position-limiting portion 72 contacts with a groove wall of the groove 632 to limit the sealing member 7 in the groove 632. For example, when the sealing member 7 is annular, the inner side surface and/or the outer side surface of the sealing member 7 is/are protruded with the stopper portion 72. It should be noted that the term "inner side surface" refers to a side surface of the seal member 7 facing the projection 64, and the term "outer side surface" refers to another side surface of the seal member 7 facing away from the projection 64.

The shape of the position-limiting portion 72 may be various, for example, the position-limiting portion 72 may be a stripe, a bump, etc. When the position-limiting portion 72 is a strip, the position-limiting portion 72 may be a ring. Of course, a plurality of strip-shaped structures with short lengths may be provided, the plurality of strip-shaped structures with short lengths are arranged at intervals along the circumferential direction of the sealing member 7, and each strip-shaped structure extends along the height direction of the sealing member 7.

The pair of strain parts 71 are pressed toward each other. Specifically, of the pair of deformed portions 71, the deformed portion 71 located on the inner side surface of the seal 7 is deformed toward the outer side surface, and the deformed portion 71 located on the outer side surface of the seal 7 is deformed toward the inner side surface. Due to the fact that the paired deformation portions 71 are close to each other, the sealing performance of the sealing member 7 between the current lead-out support 6 and the box body is better.

It is understood that the various embodiments/implementations provided by the present invention can be combined without contradiction, and are not illustrated herein.

In the embodiments of the present invention, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 an embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily 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.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A battery pack, comprising:

the box body is provided with a cavity, and the wall of the box body is also provided with a through hole which is communicated with the cavity;

the current leading-out support is connected to the box wall and comprises a first electric connection part and a second electric connection part which are connected, the first electric connection part is exposed out of the outer surface of the box body through the through hole, and the second electric connection part is used for being electrically connected with the conductive bar of the battery pack; a groove is formed between the current leading-out support and the box body; and

and the sealing element is arranged in the groove and used for sealing between the current leading-out support and the box body so as to enable the cavity to form a sealed cavity.

2. The battery pack of claim 1, wherein the current lead-out support comprises:

a base portion connected to the case, the first electrical connection portion and the second electrical connection portion being provided in the base portion; the groove is arranged between the base body part and the inner wall surface of the box body; and

and the bulge is convexly arranged on one side surface of the base body part connected with the box body, and the bulge passes through the through hole and is exposed out of the outer surface of the box body.

3. A battery pack, as recited in claim 2, wherein the groove surrounds the protrusion, and the seal is annular and surrounds the protrusion.

4. The battery pack of claim 2, wherein the protrusion surrounds the first electrical connection portion.

5. The battery pack according to claim 2, further comprising:

the pressing plate is annular, is arranged on the outer wall surface of the box body and surrounds the periphery of the protruding part;

a fastener connected to the pressure plate, the case, and the base portion.

6. The battery pack according to claim 5, wherein an orthogonal projection of the seal member onto a side surface of the base portion on which the protruding portion is provided falls within an orthogonal projection of the pressure plate onto the side surface of the base portion.

7. The battery pack of claim 5, wherein the fasteners are bolts.

8. The battery pack according to claim 1, wherein the sealing member is an elastic member having elasticity, and includes deformation portions provided in pairs, the deformation portions in pairs being configured to be deformed by the current lead-out holder and the case when the current lead-out holder is connected to the case to achieve sealing.

9. The battery pack according to claim 8, wherein the pair of deformation parts are brought close to each other in a compressed state.

10. The battery pack of claim 1, wherein the case comprises an upper case and a lower case, the upper case and the lower case being connected to form the chamber;

the upper box body is provided with a protruding part protruding in the direction away from the cavity, the through hole is formed in the protruding part, and the current leading-out support is connected to the protruding part.