CN218769863U - Battery device - Google Patents

Abstract

The present disclosure relates to the field of battery technology, and discloses a battery device; the battery device comprises a battery box and a single battery; the battery box is arranged in the accommodating box and comprises a battery body and a flange structure; the flange structure is connected with the battery body; the battery body is provided with a protruding part, the protruding part is positioned on at least one side of the battery body close to the battery box, and the protruding part and at least part of the flange structure are positioned on the same side of the battery body; the maximum distance between one surface of the protruding part, which is far away from the battery body, and the battery body is greater than or equal to the maximum distance between one surface of the flange structure, which is far away from the battery body, and the battery body. The battery device can avoid profile matching of the battery box so as to reduce the manufacturing cost of the battery box; meanwhile, the connection stability between the single battery and the battery box can be improved, so that the single battery is prevented from falling off.

Description

Battery device

Technical Field

The present disclosure relates to the field of battery technologies, and particularly, to a battery device.

Background

With the rapid development of modern industry, the problems of environmental pollution, energy shortage, resource exhaustion and the like are more and more prominent. In order to maintain the sustainable development of economy, protect the environment and energy supply of human living, zero discharge of the battery device is the first choice as a new energy source.

However, the unit cells in the battery device are easily detached.

It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to overcome the above-mentioned disadvantage of the related art that the unit cell is easily separated, and to provide a battery device in which the unit cell is not easily separated.

According to an aspect of the present disclosure, there is provided a battery device including:

a battery case having an accommodation chamber;

the single battery is arranged in the accommodating cavity and comprises a battery body and a flange structure, the flange structure is connected with the battery body, a protruding part is arranged on the battery body, and the protruding part is positioned on at least one side of the battery body, which is close to the battery box, and is positioned on the same side of the battery body as at least part of the flange structure;

the maximum distance between one surface of the protruding part, which is far away from the battery body, and the battery body is greater than or equal to the maximum distance between one surface of the flange structure, which is far away from the battery body, and the battery body.

According to the battery device, on one hand, the protruding part is arranged on the battery body, and the maximum distance between one side, away from the battery body, of the protruding part and the battery body is larger than or equal to the maximum distance between one side, away from the battery body, of the flange structure and the battery body, so that the single battery can be connected with the battery box through the protruding part, the connection area between the single battery and the battery box can be increased, the connection strength and connection firmness between the single battery and the battery box can be improved, and the problem that the single battery is separated in the vibrating process is avoided;

on the other hand, because the battery cell does not need to be connected with the battery box through the flange structure, when the battery device vibrates, no acting force is generated between the battery box and the flange structure, the flange structure is not easy to deform due to stress, the flange structure is firmly connected with the battery body, and the flange structure is not separated from the battery body due to battery bulging.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic structural diagram of an exemplary embodiment of a battery device according to the present disclosure.

Fig. 2 is a schematic structural diagram of an example embodiment of a single cell according to the present disclosure.

Fig. 3 is a schematic structural diagram of an exemplary embodiment of a plurality of unit cells according to the present disclosure.

Fig. 4 is a schematic structural view of another exemplary embodiment of a plurality of unit cells of the present disclosure.

Description of the reference numerals:

1. a battery case; 11. a base plate; 12. a side wall;

2. a single battery; 21. a battery body; 211. large surface; 212. a first facet; 213. a second facet; 214. a recessed portion; 22. a flange structure; 23. a protrusion; 24. a battery post; 25. a first unit cell; 26. a second unit cell;

3. a heat exchange plate;

4. and (7) bonding the layers.

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. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first" and "second," etc. are used merely as labels, and are not limiting on the number of their objects.

In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate. "and/or" is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

The present disclosure provides a battery device, which may include a battery case 1 and a unit battery 2, as shown in fig. 1 and 2; the battery box may have a receiving cavity; the single battery 2 may be disposed in the accommodating cavity, and the single battery 2 may include a battery body 21 and a flange structure 22; the flange structure 22 may be connected to the battery body 21; the battery body 21 may be provided with a protrusion 23, and the protrusion 23 may be located on at least one side of the battery body 21 close to the battery box 1, and is located on the same side of the battery body 21 as at least part of the flange structure 22; wherein, the maximum distance between the surface of the protruding portion 23 facing away from the battery body 21 and the battery body 21 may be greater than or equal to the maximum distance between the surface of the flange structure 22 facing away from the battery body 21 and the battery body 21.

This disclosed battery device, through set up protruding portion 23 on battery body 21, and make protruding portion 23 keep away from the one side of battery body 21 and the biggest distance between battery body 21 that the biggest distance between one side that battery body 21 deviates from of flange structure 22 and the battery body 21 be more than or equal to, can make battery cell 2 be connected with battery box 1 through protruding portion 23, with this area of being connected that can increase battery cell 2 and battery box 1, thereby can improve the joint strength of battery cell 2 and battery box 1 and the fastness of being connected, and then avoid battery cell 2 to take place the problem of breaking away from at the in-process of shaking.

Moreover, since the single battery 2 does not need to be connected with the battery box 1 through the flange structure 22, when the battery device vibrates, no acting force is generated between the battery box 1 and the flange structure 22, the flange structure 22 is not easy to deform due to stress, the flange structure 22 is firmly connected with the battery body 21, and the flange structure 22 is not separated from the battery body 21 due to battery swelling.

The battery device will be exemplified below.

As described with reference to fig. 1 and 2, the battery device may include a battery box 1, the battery box 1 may include a bottom plate 11, a protective cover, and four side walls 12, the bottom plate 11 and the protective cover (not shown in the drawings) may be configured as a rectangle, the four side walls 12 are disposed around the bottom plate 11, the four side walls 12 are connected in an end-to-end manner to form a rectangular loop, the protective cover is disposed on the other side of the four side walls 12, and the protective cover may be disposed opposite to the bottom plate 11. The bottom plate 11, the protective cover and the four side walls 12 may form a receiving cavity around them.

Of course, in other example embodiments of the present disclosure, the bottom plate 11 and the protective cover may be provided in a circular shape, an oval shape, a trapezoidal shape, etc., and the side wall 12 may be provided in one or more shapes and formed in a circular shape, an oval shape, a trapezoidal shape, etc., so that the battery case 1 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc. The battery box 1 body can also be in other shapes, and the description is omitted.

In other example embodiments of the present disclosure, the battery box 1 may also be provided without a protective cover, i.e., the battery box 1 may include only the bottom plate 11 and the four side walls 12. The bottom plate 11 and the four side walls 12 may form a receiving cavity around.

A single cell 2 may be disposed within the receiving cavity. Referring to fig. 3 to 4, the unit cell 2 may include a cell body 21 and a flange structure 22. The battery body 21 may include a battery case and a battery cell. The cell refers to a unit formed by winding or laminating a stack including a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. Wherein the polarities of the first and second electrodes may be interchanged. The battery core can be arranged in the battery shell, and the battery shell can be an integrated shell, so that the structural strength of the battery shell can be ensured, the assembly efficiency of the battery can be improved, and the connection strength of the battery shell is further enhanced.

The battery case may include two large faces 211, two first small faces 212, and two second small faces 213. The two large faces 211, the two first small faces 212 and the two second small faces 213 may enclose a receiving space, and the battery cell may be located in the receiving space, so that the battery cell can be reliably sealed.

In an example embodiment of the present disclosure, the length of the second facet 213 may be greater than the length of the first facet 212, such that the area of the second facet 213 may be greater than the area of the first facet 212. Referring to fig. 3, when the unit batteries 2 are placed in the battery case 1, two second small faces 213 may be disposed opposite to the bottom plate 11 and the protective cover of the battery case 1 in one-to-one correspondence, and two first small faces 212 and two large faces 211 may be disposed opposite to the four side walls 12 of the battery case 1 in one-to-one correspondence.

In other example embodiments of the present disclosure, as shown with reference to fig. 4, when the unit batteries 2 are placed in the battery box 1, the two second facets 213 and the two first facets 212 may be disposed opposite to the four side walls 12 in one-to-one correspondence, and the two large facets 211 may be disposed opposite to the bottom plate 11 and the protection cover in one-to-one correspondence. Furthermore, a plurality of unit batteries 2 are sequentially stacked in a direction from the bottom plate 11 toward the protective cover to form a battery pack, and at least two battery packs are sequentially arranged in the battery case 1.

The material of the battery case may be a metal material, for example: steel, aluminum, and the like. The battery case may be of an integrally formed structure, that is: the two large faces 211, the two first small faces 212 and the two second small faces 213 can be manufactured in an integrated manner, so that the connection position of the battery shell can be reduced while the battery shell is guaranteed to have large structural strength, the possibility of cracking of the connection position can be reduced, and the metal shell can be guaranteed to have good sealing performance on the battery core.

In an example embodiment of the present disclosure, the flange structure 22 may be connected to the battery body 21. The flange structure 22 may be disposed at a portion of the peripheral edge of the battery case, and the flange structure 22 may be disposed at a portion other than the peripheral edge of the battery case, i.e., the flange structure 22 is a circumferentially non-closed structure.

The flange structure 22 may be one or more, for example, when the battery case is a rectangular structure, one side of the battery case may be provided with the flange structure 22, or two adjacent sides of the battery case may be provided with the flange structure 22, or only one side of the battery case is not provided with the flange structure 22, or two opposite sides of the battery case are respectively provided with the flange structures 22.

In example embodiments of the present disclosure, the flange structure 22 may be connected to one side of at least one of the two first large faces 211, or the flange structure 22 may be connected to both sides of at least one of the two first large faces 211, or the flange structure 22 may not be provided only on one side of at least one of the two first large faces 211, or the flange structure 22 may be connected to all sides of at least one of the two first large faces 211. The flange structure 22 can be used as a heat sink to improve the heat dissipation performance of the unit cells 2, thereby improving the heat dissipation performance of the battery.

A protrusion 23 may be disposed on the battery body 21, and the protrusion 23 may be located on at least one side of the battery body 21 close to the battery box 1, and on the same side of the battery body 21 as at least part of the flange structure 22. Also, the maximum distance between the surface of the protruding portion 23 facing away from the battery body 21 and the battery body 21 may be greater than or equal to the maximum distance between the surface of the flange structure 22 facing away from the battery body 21 and the battery body 21.

This is disclosed through set up protruding portion 23 on battery body 21, can be so that battery cell 2 is connected with battery box 1 through protruding portion 23 to this area of connection that can increase battery cell 2 and battery box 1, thereby can improve the joint strength of battery cell 2 and battery box 1 and the fastness of being connected, and then avoid battery cell 2 to take place to drop the problem that breaks away from at the in-process of shaking.

Moreover, since the flange structure 22 is connected to the at least one first large surface 211, when the battery device vibrates and the flange structure 22 is connected to the battery box 1, an acting force may be generated between the flange structure 22 and the battery box 1, and the acting force may bend the flange structure 22 under a force, so that the joint of the flange structure 22 and the first large surface 211 may be bent, and the single battery 2 may be blown open due to swelling. However, the protruding portion 23 is connected to the battery box 1, so that the single battery 2 does not need to be connected to the battery box 1 through the flange structure 22, when the battery device vibrates, no acting force is generated between the battery box 1 and the flange structure 22, the flange structure 22 is not easily stressed and deformed, the flange structure 22 is firmly connected to the first large surface 211, the flange structure is not separated from the first large surface 211 due to battery swelling, and the risk that the single battery 2 is blown out due to swelling is avoided.

In addition, since the unit cell 2 is provided with the flange structure 22 and the protruding portion 23 at the same time, the space utilization rate of the unit cell 2 can be improved.

In an example embodiment of the present disclosure, the protrusion 23 may be provided on at least one 213 of the two second facets 213. That is, the protruding portion 23 may be provided with one or two. For example, when one protrusion 23 is provided and only the bottom plate 11 and the four side walls 12 are provided to the battery case 1, the protrusion 23 is provided on the second facet 213 opposite to the bottom plate 11 of the two second facets 213, and the protrusion 23 is connected to the bottom plate 11; when the protruding portions 23 are provided two and the battery case 1 is provided with the protective cover, the bottom plate 11 and the four side walls 12, the protruding portions 23 may be provided on the two second facets 213, respectively, and the two protruding portions 23 may be connected with the protective cover and the bottom plate 11, respectively, to improve the connection stability of the unit batteries 2 and the unit batteries 2 with the battery case 1.

In the embodiment of the present disclosure, one surface of the protruding portion 23 away from the battery body 21 may be an arc surface, so that the structural strength of the protruding portion 23 can be improved, the bearing capacity of the protruding portion 23 can be improved, and the battery device can have high safety.

The maximum distance between the surface of the protruding portion 23 departing from the battery body 21 and the battery body 21 may be greater than or equal to 1mm, so as to ensure that the maximum distance between the surface of the protruding portion 23 formed after the single battery 2 is compressed and the battery body 21 is greater than or equal to the maximum distance between the surface of the flange structure 22 departing from the battery body 21 and the battery body 21. Moreover, the maximum distance between the surface of the protruding portion 23 away from the battery body 21 and the battery body 21 may be less than or equal to 15mm, so that it is possible to avoid that the protruding portion 23 is too high to affect the assembly of the single battery 2 in the battery box 1.

In other example embodiments of the present disclosure, opposite two side surfaces of the single battery 2 in the first direction X may abut against the inner side wall 12 of the battery case 1, and the battery case 1 may press the single battery 2 to form the protruding portion 23, so that it may be possible to avoid manufacturing the protruding portion 23 separately on the single battery 2, and it is also not necessary to redesign a mold for manufacturing the single battery 2 with the protruding portion 23, so that a large amount of manufacturing time and manufacturing cost may be saved by this embodiment. The first direction X may be perpendicular to a direction in which the protruding portion 23 protrudes from the battery body 21.

The compression amount of the single battery 2 can be greater than or equal to 1%, so that the maximum distance between one surface of the protruding portion 23, which is formed after the single battery 2 is compressed and is away from the battery body 21, and the battery body 21 is greater than or equal to the maximum distance between one surface of the flange structure 22, which is away from the battery body 21, and the battery body 21. In addition, the compression amount of the single battery 2 may be less than or equal to 40%, so that the maximum distance between the surface of the protruding portion 23 away from the battery body 21 and the battery body 21 is prevented from being too large to affect the assembly work of the single battery 2, and the problem that the single battery 2 is broken due to the too large compression amount can be prevented.

In order to enable the connection of the individual cells 2 to the battery box 1, the battery device may further comprise an adhesive layer 4. This adhesive linkage 4 can bond between battery box 1 and battery cell 2 to at least part of adhesive linkage 4 can be located between protruding portion 23 and battery box 1, can have higher joint strength with this assurance between battery cell 2 and the battery box 1, can have better firm in connection nature with assurance between battery cell 2 and the battery box 1.

In an example embodiment of the present disclosure, as illustrated with reference to fig. 1, 3, and 4, the unit batteries 2 may be disposed at least two, and the adjacent two unit batteries 2 may be a first unit battery 25 and a second unit battery 26. When assembling the first unit cell 25 and the second unit cell 26, the first unit cell 25 and the second unit cell 26 may be pressed against each other such that the first unit cell 25 and the second unit cell 26 each form the protruding portion 23.

The compression amount between the first single battery 25 and the second single battery 26 can also be greater than or equal to 1%, so that the maximum distance between the surface, away from the battery body 21, of the protruding portion 23 formed after the compression of the first single battery 25 and the second single battery 26 and the battery body 21 is greater than or equal to the maximum distance between the surface, away from the battery body 21, of the flange structure 22 and the battery body 21. Furthermore, the compression amount between the first unit cell 25 and the second unit cell 26 may be less than or equal to 40%, so that the maximum distance between the surface of the protruding portion 23 facing away from the battery body 21 and the battery body 21 can be prevented from being too large to affect the assembly work of the first unit cell 25 and the second unit cell 26, and the problem that the first unit cell 25 and the second unit cell 26 are broken due to the too large compression amount can be prevented.

The single battery 2 may further include a battery post 24, the battery post 24 may be connected to the battery body 21 and connected to the first electrode and the second electrode of the battery cell, and the battery post 24 may protrude from the battery body 21 in the first direction X. The number of the battery post 24 may be one or two, and when there are two battery posts 24, the two battery posts 24 may be spaced apart from each other and may protrude from the same large surface 211 of the two large surfaces 211 and be insulated from the large surface 211. Two battery posts 24 may be connected to the first and second electrodes of the cell, respectively, to form the positive and negative electrodes of the battery cell 2.

In an example embodiment of the present disclosure, a surface of the battery body 21 facing away from the battery post 24 may be provided with a recessed portion 214, that is: one of the two large faces 211 of the battery body 21 on which the battery post 24 is not provided may be provided with a recessed portion 214. The battery post 24 of the second unit cell 26 may be located within the recessed portion 214 of the first unit cell 25 to facilitate connection of the battery post 24 of the first unit cell 25 and the battery post 24 of the second unit cell 26. Also, the battery body 21 of the second unit cell 26 can be made to abut against the battery body 21 of the first unit cell 25, whereby a large amount of space can be saved, so that more unit cells 2 can be provided in the battery case 1.

When each single battery 2 has two battery posts 24, one surface of the battery body 21 departing from the battery posts 24 may be provided with two recessed portions 214, the two recessed portions 214 may be respectively located at two sides of the large surface 211 where the two recessed portions 214 are located, and the two battery posts 24 of the second single battery 26 may be respectively located in the two recessed portions 214 of the first single battery 25.

The battery device may include a bus bar, and the battery post 24 of the first unit battery 25 and the battery post 24 of the second unit battery 26 may be connected to the bus bar, respectively, to realize series connection or parallel connection of the first unit battery 25 and the second unit battery 26.

The battery device may further include a buffer layer. The buffer layer may be disposed between adjacent two unit cells 2, that is, the buffer layer may be disposed between the first unit cell 25 and the second unit cell 26. The buffer layer may have a certain elasticity and a certain amount of compression, so that the buffer layer may be formed between the first unit cell 25 and the second unit cell 26, and prevent the first unit cell 25 and the second unit cell 26 from rubbing or colliding with each other during the movement of the battery device, thereby causing a problem that the first unit cell 25 and/or the second unit cell 26 are damaged.

In example embodiments of the present disclosure, the battery device may further include a heat exchange plate 3. The heat exchange plate 3 may be disposed between the battery box 1 and the single battery 2, specifically, the heat exchange plate 3 may be disposed between the bottom plate 1 and the single battery 2; and at least a portion of the heat exchange plate 3 may be located between the protrusion 23 and the battery case 1 to directly conduct heat in the battery body 21 to the heat exchange plate 3 through the protrusion 23, so that the heat exchange efficiency between the unit battery 2 and the heat exchange plate 3 can be improved.

Because the maximum distance between the surface of the protruding portion 23 departing from the battery body 21 and the battery body 21 is greater than or equal to the maximum distance between the surface of the flange structure 22 departing from the battery body 21 and the battery body 21, and the flange structure 22 is not in contact with the heat exchange plate 3, at least one part of the heat exchange plate 3 opposite to the single battery 2 can be set to be a flat plate, so that the heat exchange plate 3 and the flange structure 22 can be prevented from being subjected to profiling matching, and the manufacturing cost and the manufacturing difficulty of the heat exchange plate 3 can be reduced.

In other example embodiments of the present disclosure, as shown with reference to fig. 4, the heat exchange plate 3 may also be disposed between two adjacent columns of the single batteries 2; moreover, the heat exchange plate 3 can be in contact with the protruding portions 23 of two adjacent rows of single batteries 2, so that heat in the battery body 21 can be directly conducted to the heat exchange plate 3 through the protruding portions 23 of two adjacent rows of single batteries 2, and the heat exchange efficiency between the single batteries 2 and the heat exchange plate 3 can be improved.

In other example embodiments of the present disclosure, the bottom plate 11 of the battery box 1 may be reused as the heat exchange plate 3, that is, a heat exchange channel may be provided in the bottom plate 11, and a heat exchange medium may be provided in the heat exchange channel. Thus, compared to the previous embodiment, the present embodiment does not require a separate heat exchange plate 34 on the base plate 1, thereby further reducing the manufacturing cost of the battery device, and also saving the space in the battery box 1, thereby reducing the volume and weight of the battery device.

In this example embodiment, the heat exchange medium may be a phase change material, such as: water, acetic acid, and the like. But not limited thereto, the heat exchange medium may also be other materials as long as the heat exchange can be realized, which are not described herein again.

The references to "parallel" and "perpendicular" in this application are not exactly parallel, perpendicular, but rather have some tolerance; for example, the angle between the two is equal to or greater than 0 ° and equal to or less than 5 °, i.e. the two are considered to be parallel to each other; the included angle between the two is more than or equal to 85 degrees and less than or equal to 95 degrees, namely the two are considered to be mutually perpendicular.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (11)

1. A battery device, comprising:

a battery case having an accommodation chamber;

the single battery is arranged in the accommodating cavity and comprises a battery body and a flange structure, the flange structure is connected with the battery body, a protruding part is arranged on the battery body, and the protruding part is positioned on at least one side of the battery body, which is close to the battery box, and is positioned on the same side of the battery body as at least part of the flange structure;

the maximum distance between one surface of the protruding part, which is far away from the battery body, and the battery body is greater than or equal to the maximum distance between one surface of the flange structure, which is far away from the battery body, and the battery body.

2. The battery device according to claim 1, wherein opposite side surfaces of the unit batteries in a first direction abut against inner side walls of the battery case, the battery case presses the unit batteries to form the protruding portions, and the first direction is perpendicular to a direction in which the protruding portions protrude from the battery body.

3. The battery device according to claim 1, wherein a surface of the protruding portion facing away from the battery body is provided as an arc surface.

4. The battery device according to claim 2, wherein the compression amount of the unit cells is 1% or more and 40% or less.

5. The battery device of claim 1, wherein the cell further comprises:

the battery pole is connected with the battery body and protrudes out of the battery body in the first direction;

the battery body is provided with a concave part on one side deviating from the battery pole, two adjacent single batteries are a first single battery and a second single battery, the battery pole of the second single battery is positioned in the concave part of the first single battery, and the first direction is perpendicular to the direction in which the protruding part protrudes out of the battery body.

6. The battery device according to claim 5, wherein the battery body includes two large faces, two first small faces, and two second small faces, the second small face has an area larger than that of the first small face, the battery post is provided on one of the large faces, and the protrusion is provided on the second small face.

7. The battery device according to claim 1, wherein a maximum distance between a face of the protruding portion facing away from the battery body and the battery body is greater than or equal to 1mm and less than or equal to 15mm.

8. The battery device according to any one of claims 1 to 7, characterized in that the battery device further comprises:

and the bonding layer is bonded between the battery box and the single battery, and at least part of the bonding layer is positioned between the protruding part and the battery box.

9. The battery device according to any one of claims 1 to 7, characterized in that the battery device further comprises:

the heat exchange plate is arranged between the battery box and the single batteries, at least part of the heat exchange plate is positioned between the protruding part and the battery box, and at least one part of the heat exchange plate, which is opposite to the single batteries, is arranged to be a flat plate.

10. The battery device of claim 9, wherein the battery box comprises a backplane that is multiplexed into the heat exchange plate.

11. The battery device according to claim 1, wherein the unit batteries are provided in at least two, the battery device further comprising:

and the buffer layer is arranged between two adjacent single batteries.

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