CN219759882U - Battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device which comprises a plurality of battery components and a bus bar; the battery assembly comprises a single battery and a positioning piece, and the positioning piece is positioned at one side of the single battery; the busbar electricity is connected two at least monomer batteries, and the setting element is used for fixing a position the busbar to fix the busbar. The positioning piece is arranged to position and fix the busbar in the process of being connected with the single battery, so that the busbar is convenient to be connected with the single battery.

Description

Battery device

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery device.

Background

Currently, new energy electric vehicles are increasingly receiving social attention, and have become the development direction of future automobiles. The battery device is an important component in the electric automobile, and the design optimization of the battery device becomes an important item for the development of the electric automobile.

However, the bus bar and the single battery in the conventional battery device are not easy to connect.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure aims to overcome the disadvantage that the bus bar and the single battery are not easy to connect in the battery device of the related art, and provide a battery device in which the bus bar and the single battery are easy to connect.

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

the battery assembly comprises a single battery and a positioning piece, wherein the positioning piece is positioned on one side of the single battery;

and the positioning piece is used for positioning the busbar and fixing the busbar.

The battery device of this disclosure, on the one hand can fix a position the busbar through setting up the setting element to when busbar and battery cell carry out the electricity and are connected, only need directly place the busbar in setting element department, so that can realize the quick location of busbar. Therefore, compared with the prior art, the bus bar and the single battery do not need to be repeatedly aligned, so that the bus bar and the single battery are more convenient to connect, and the electric connection efficiency between the bus bar and the single battery is improved.

On the other hand, after the busbar location is good, can utilize the setting element to fix the busbar of location for the position of the busbar of location can not change, avoids influencing the electric connection quality between busbar and the battery cell because the deviation appears once more in the position of busbar.

And after utilizing setting element fixed busbar, no longer need operating personnel at the in-process that busbar and battery cell electricity are connected always fixed the busbar with the hand to this can liberate operating personnel's hand, make the busbar more convenient with battery cell's electricity connection, can reduce operating personnel's security risk simultaneously.

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 disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

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

Fig. 2 is a schematic structural view of an exemplary embodiment of a battery cell of the present disclosure.

Fig. 3 is a partial schematic structure view of an exemplary embodiment of a battery device of the present disclosure.

Fig. 4 is an enlarged schematic view of the structure at D in fig. 3 according to an exemplary embodiment of the present disclosure.

Fig. 5 is a partial schematic structure view of another exemplary embodiment of a battery device of the present disclosure.

Fig. 6 is an enlarged schematic view of the structure at E in fig. 5 according to an exemplary embodiment of the present disclosure.

Reference numerals illustrate:

10. a battery assembly; 11. a single battery; 111. a battery post; 112. a battery case; 113. a first surface; 114. a second surface; 115. a third surface; 12. a positioning piece; 121. a receiving groove; 122. an opening; 123. a first limiting plate; 124. a second limiting plate; 125. a bevel portion; 13. a protective shell;

20. a busbar; 21. a main body portion; 22. a first connection portion; 23. a second connecting portion;

30. a case; 31. a bottom plate; 32. a side plate; 33. a heat exchange plate;

x, a first direction; y, second direction; A. a length direction; the height direction B; C. in the thickness direction.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions 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" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. 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 through another structure.

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

In the present utility model, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The present disclosure provides a battery device, which includes a plurality of battery packs 10 and a bus bar 20, as shown with reference to fig. 1 to 6; the battery assembly 10 includes a unit battery 11 and a positioning member 12, the positioning member 12 being located at one side of the unit battery 11; the bus bar 20 is electrically connected to at least two unit cells 11, and the positioning member 12 is used for positioning the bus bar 20 and fixing the bus bar 20.

In the battery device of the disclosure, on one hand, the positioning member 12 is provided to position the bus bar 20, so that when the bus bar 20 is electrically connected with the unit battery 11, the bus bar 20 is only required to be directly placed at the positioning member 12, and thus the bus bar 20 can be rapidly positioned. Therefore, compared with the prior art, the bus bar 20 and the single battery 11 do not need to be repeatedly aligned, so that the bus bar 20 and the single battery 11 are more convenient to connect, and the electrical connection efficiency between the bus bar 20 and the single battery 11 is improved.

On the other hand, after the busbar 20 is positioned, the positioning piece 12 can be used to fix the positioned busbar 20, so that the position of the positioned busbar 20 cannot be changed, and the influence on the electrical connection quality between the busbar 20 and the single battery 11 due to the fact that the position of the busbar 20 deviates again is avoided.

And, utilize behind the fixed busbar 20 of setting element 12, no longer need operating personnel at the in-process that busbar 20 and battery cell 11 electricity are connected always fixed busbar 20 with the hand to this can liberate operating personnel's hand, make the electric connection of busbar 20 and battery cell 11 more convenient, can reduce operating personnel's security risk simultaneously.

In one embodiment of the present disclosure, referring to fig. 2, the unit cell 11 may have a length direction a, a height direction B, and a thickness direction C. The battery cell 11 may include a battery case 112 and an electric core. The battery cell is a unit formed by winding or laminating a stacking part, and the stacking part comprises 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 electrode and the second electrode are interchangeable. The cells may be disposed within the battery housing 112.

The battery case 112 may be substantially rectangular parallelepiped, and may include two first surfaces 113 disposed opposite to each other, two second surfaces 114 disposed opposite to each other, and two third surfaces 115 disposed opposite to each other. Wherein the area of the first surface 113 may be larger than the area of the second surface 114, and the area of the first surface 113 may also be larger than the area of the third surface 115. The first surface 113 may be perpendicular to the thickness direction C, the second surface 114 may be perpendicular to the height direction B, and the third surface 115 may be perpendicular to the length direction a. With this structure, the battery case 112 can improve the space utilization of the battery device, thereby improving the energy density of the battery device.

In one embodiment, the area of the second surface 114 may be greater than the area of the third surface 115.

In one embodiment, the two first surfaces 113, the two second surfaces 114, and the two third surfaces 115 may enclose a receptacle, and the cells may be located within the receptacle, thereby enabling reliable sealing of the cells.

The material of the battery case 112 may be a metal material, for example: steel, aluminum, etc. The battery housing 112 may be of an integrally formed structure, namely: the two first surfaces 113, the two second surfaces 114 and the two third surfaces 115 can be integrally manufactured, so that the connection position of the battery shell 112 can be reduced while the greater structural strength of the battery shell 112 is ensured, the possibility of cracking at the connection position can be reduced, and the metal shell can be ensured to have better tightness to the battery cell. But is not limited thereto, the battery case 112 may be a separate structure, which is also within the scope of the present disclosure.

In one embodiment, the wall thickness of the battery housing 112 is 0.1mm-0.5mm in one embodiment, so that the weight of the battery housing 112 can be reduced, thereby increasing the energy density of the battery cell 11. The thickness of the first surface 113, the second surface 114 and the third surface 115 is 0.1mm-0.5mm.

The wall thickness of the battery housing 112 may be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm, etc.

In one embodiment, the unit cell 11 may further include: and a battery post 111. The battery post 111 may be located on a surface of the unit battery 11 parallel to the height direction B. Namely: the battery post 111 may be located on the first surface 113 or the third surface 115. The battery post 111 may be electrically connected with the battery cell to form the positive and negative electrodes of the unit battery 11. The bus bar 20 may be electrically connected with the battery posts 111 of at least two unit batteries 11.

In one embodiment, there may be two battery poles 111 on one single battery 11, and the two battery poles 111 may be located on the same first surface 113, so as to save space occupied by the single battery 11 by the battery device, thereby improving space utilization of the battery device and improving energy density of the battery device.

In addition, the two battery poles 111 may be located on the two third surfaces 115 disposed opposite to each other, which may also improve the space utilization of the battery device and the energy density of the battery device.

But not limited thereto, the two battery poles 111 may be located on the opposite two first surfaces 113, respectively, or one of the battery poles 111 is located on the first surface 113, the other battery pole 111 is located on the third surface 115, or both the two electrode poles may be located on the second surface 114.

In one embodiment of the present disclosure, as shown with reference to fig. 1 to 6, a plurality of battery packs 10 may be sequentially arranged in the first direction X, and the positioning member 12 may be located at one side of the unit cells 11 in the first direction X. By this arrangement, the positioning members 12 can be prevented from occupying the space on both sides of the battery device in the first direction X, so that the length of the battery device in the first direction X can be reduced, and the energy density of the battery device can be improved.

In the present embodiment, the positioning member 12 may be directly disposed on the surface of the unit cell 11, i.e., the positioning member 12 may be directly connected with the cell housing 112.

In one embodiment, the first direction X may be parallel to the thickness direction C of the unit cells 11, i.e., the plurality of battery packs 10 may be sequentially arranged in the thickness direction C of the unit cells 11, and the first surfaces 113 of the unit cells 11 may be perpendicular to the first direction X, and the first surfaces 113 of adjacent two unit cells 11 may be disposed opposite to each other.

In one embodiment, referring to fig. 1 to 6, the battery assembly 10 may further include a protective case 13. The battery cell 11 may be located within the protective case 13. The single battery 11 can be protected by the protective shell 13, and the single battery 11 is prevented from being damaged due to collision.

The positioning element 12 can be connected to a side of the protective housing 13 facing away from the battery cell 11. Because the thickness of the battery case 112 is thin, the positioning member 12 is not easily disposed on the battery case 112, and the battery case 112 is easily stressed to be damaged when the positioning member 12 is disposed on the battery case 112. Therefore, in this embodiment, the battery case 112 can be prevented from being damaged, and the structural strength of the protective case 13 is high, as compared with the previous embodiment, so that when the positioning member 12 is provided on the protective case 13, the protective case 13 can withstand the load applied to the positioning member 12 by the bus bar 20, so that the bus bar 20 is fixed more firmly.

In one embodiment of the present disclosure, the positioning member 12 may have a receiving groove 121, the receiving groove 121 may have an opening 122, and at least a portion of the bus bar 20 may be disposed within the receiving groove 121 through the opening 122 and abut against a sidewall of the receiving groove 121.

It should be noted that, the abutment of the bus bar 20 with the side wall of the receiving groove 121 herein means that there is an interaction force between the bus bar 20 and the receiving groove 121, so that the bus bar 20 is pressed onto the protective case 13 through the side wall of the receiving groove 121, thereby fixing the bus bar 20.

By the arrangement, the bus bar 20 can be positioned by the accommodating groove 121, and at least part of the bus bar 20 is only required to be arranged in the accommodating groove 121, so that the positioning difficulty of the positioning piece 12 to the bus bar 20 is reduced. Meanwhile, the fixing of the bus bars 20 can be synchronously realized by arranging the accommodating grooves 121, and the fixing difficulty of the positioning piece 12 to the bus bars 20 is also reduced.

In one embodiment of the present disclosure, the bus bar 20 may include a main body portion 21, a first connection portion 22, and a second connection portion 23. Wherein, the main body portion 21 may be disposed on a surface of the protective housing 13 facing away from the unit cells 11, the first connection portion 22 and the second connection portion 23 may be connected with two ends of the main body portion 21 in the first direction X, and the first connection portion 22 and the second connection portion 23 may extend along the second direction Y, and the first connection portion 22 and the second connection portion 23 may be connected with two adjacent unit cells 11. The second direction Y is a direction in which the main body 21 points toward the single battery 11.

By the arrangement, the bus bar 20 can be clamped with the protective shell 13, so that the stability of the bus bar 20 after being fixed by the positioning piece 12 is improved. In addition, after the first connection portion 22 and the second connection portion 23 extend along the second direction Y, the first connection portion 22 and the second connection portion 23 may be located on two sides of the single battery 11 in the first direction X, and since the positioning member 12 is located on one side of the single battery 11 in the first direction X, the positioning member 12 may be convenient for positioning and fixing the busbar 20.

At least part of the first connection part 22 or at least part of the second connection part 23 may be located in the receiving groove 121 to position and fix at least part of the first connection part 22 or at least part of the second connection part 23 by the positioning member 12, so that the positioning and fixing of the bus bar 20 may be achieved.

In one embodiment, the second direction Y may be parallel to the length direction a of the unit cell 11, so that the bus bar 20 may be located at one side of the unit cell 11 in the length direction a.

In the present embodiment, the positioning member 12 and the bus bar 20 may be located on the same side of the unit cell 11 in the length direction a. By such arrangement, the distance between the positioning member 12 and the bus bar 20 can be made closer, so that the positioning member 12 can position and fix the bus bar 20 conveniently, and meanwhile, the first connecting portion 22 and the second connecting portion 23 do not need to extend too long.

In the present embodiment, the battery post 111 may be located on the same side of the single battery 11 in the length direction a as the bus bar 20. Namely: the battery post 111, the bus bar 20, and the positioning member 12 may all be located on the same side of the unit battery 11 in the length direction a. By doing so, the extending distance of the first connection portion 22 and the second connection portion 23 can be further reduced, facilitating connection between the bus bar 20 and the unit cell 11.

The fact that the battery post 111 and the bus bar 20 are located on the same side of the unit battery 11 means that the bus bar 20 to which the battery post 111 may be connected is located on the same side of the unit battery 11. When the unit cell 11 is provided with two battery poles 111, the bus bars 20 to which the two battery poles 111 can be connected, respectively, are located on the same side on the unit cell 11.

In one embodiment of the present disclosure, referring to fig. 3 to 6, the positioning member 12 may include a first limiting plate 123 and a second limiting plate 124. The first limiting plate 123 may be connected to a side of the protective case 13 facing away from the unit cell 11, and may extend in the first direction X. The second limiting plate 124 may be connected to an end of the first limiting plate 123 facing away from the protective case 13, and may extend in a direction away from the first limiting plate 123. The first limiting plate 123, the second limiting plate 124 and the protective housing 13 may enclose the accommodating groove 121, and at least part of the first connecting portion 22 or at least part of the second connecting portion 23 may abut against the inner wall of the second limiting plate 124 and the protective housing 13.

Thus, the first limiting plate 123 can be used to position the bus bar 20, and the second limiting plate 124 can be used to fix the bus bar 20, so that the structure of the positioning member 12 can be simplified. And when the busbar 20 is positioned and fixed, only the first connecting part 22 or the second connecting part 23 is required to be inserted between the second limiting plate 124 and the protective shell 13, and the positioning and the fixing can be completed when the first connecting part 22 or the second connecting part 23 props against the first limiting plate 123, so that the positioning and the fixing difficulty of the positioning piece 12 to the busbar 20 are remarkably reduced, and the positioning and the fixing efficiency of the positioning piece 12 to the busbar 20 are improved.

In one embodiment, referring to fig. 5 and 6, an end of the second limiting plate 124 remote from the first limiting plate 123 may be provided with a slope portion 125, and at least a portion of the first connection portion 22 or at least a portion of the second connection portion 23 may enter the receiving groove 121 through the slope portion 125. The height of the slope portion 125 may gradually decrease from a side closer to the protective case 13 to a side farther from the protective case 13. The ramp 125 may be used to guide at least a portion of the first connector 22 or at least a portion of the second connector 23 into the receiving slot 121 when it is desired to position and secure the bus bar 20.

In one embodiment, the positioning member 12 may be a resilient member, and the positioning member 12 applies a preload force to the busbar 20. When the positioning member 12 is provided as the elastic member, the positioning member 12 may be pulled to expand the receiving groove 121 when the bus bar 20 is provided, thereby facilitating the bus bar 20 to enter into the receiving groove 121. Meanwhile, after the bus bar 20 enters the receiving groove 121, the positioning member 12 may be restored to the original state by the elastic force of the positioning member 12, and a pre-tightening force is applied to the bus bar 20 to fix the bus bar 20.

When the positioning member 12 includes the first and second limiting plates 123 and 124, the second limiting plate 124 may be broken to expand the receiving groove 121, and a pre-tightening force may be applied to the bus bar 20 by using the second limiting plate 124 to fix the bus bar 20.

When the inclined surface portion 125 is disposed at the end of the second limiting plate 124 away from the first limiting plate 123, the bus bar 20 can be utilized to press the inclined surface portion 125, so that the positioning member 12 and the bus bar 20 are relatively displaced, and the positioning member 12 is deformed, so that the bus bar 20 can enter the accommodating groove 121.

In one embodiment of the present disclosure, as shown with reference to fig. 3 and 5, in the battery assembly 10, two positioning members 12 may be provided at a distance, and openings 122 of two receiving grooves 121 may be provided opposite to each other. Through setting up two setting elements 12, can utilize two setting elements 12 to carry out spacingly to busbar 20's relative both ends to can further promote the accuracy of location, and can be fixed more firm with busbar 20, the operating personnel of being convenient for carries out follow-up connection work.

In one embodiment, referring to fig. 2, 3 and 5, when the positioning members 12 are located at one side of the unit cell 11 in the length direction a, the two positioning members 12 may be spaced apart in the height direction B of the unit cell 11 to limit the two ends of the bus bar 20 in the height direction B, so that the problem that the bus bar 20 falls off due to gravity can be effectively prevented.

In one embodiment of the present disclosure, the material of the positioning member 12 may be an insulating material, such as: plastic, rubber, etc., to prevent the battery device from being damaged due to conduction between the positioning member 12 and the bus bar 20.

However, the material of the positioning member 12 may be a metal material, but when the material of the positioning member 12 is a metal material, a structure such as an insulating pad is added at a contact position between the positioning member 12 and the busbar 20 to prevent the electrical conduction.

In one embodiment of the present disclosure, referring to fig. 1 and 2, the battery device may further include a case 30. The case 30 may include a bottom plate 31, a protective cover (not shown), and side plates 32. The bottom plate 31 and the protective cover can be rectangular, four side plates 32 are arranged around the bottom plate 31, the four side plates 32 are connected end to form a rectangular ring, the protective cover is arranged on the other side of the four side plates 32, and the protective cover and the bottom plate 31 can be arranged oppositely. The bottom plate 31, the protective cover, and the four side plates 32 surround to form an accommodating space in which the plurality of battery assemblies 10 and the bus bars 20 may be disposed, and the two second surfaces 114 of the unit cells 11 may be disposed opposite to the bottom plate 31 and the protective cover, respectively.

Of course, in other example embodiments of the present disclosure, the bottom plate 31 and the protective cover may be provided in a circular shape, an elliptical shape, a trapezoid shape, etc., and the side plate 32 may be provided in one or more and formed around the circular shape, the elliptical shape, the trapezoid shape, etc., such that the case 30 is formed in a cylindrical shape, an elliptical cylindrical shape, a prismatic shape, etc. The case 30 may have other shapes, and is not described in detail herein.

In the present exemplary embodiment, the bottom plate 31 may include a heat exchange plate 33, and a passage may be provided in the heat exchange plate 33, and a heat exchange medium may be introduced into the passage, and heat generated from the unit cells 11 may be exchanged with heat of the heat exchange medium by providing the heat exchange medium. Namely: when the unit battery 11 needs to be cooled, a heat exchange medium with lower temperature can be introduced into the heat exchange plate 33 to cool the unit battery 11; when it is necessary to raise the temperature of the unit cell 11, a heat exchange medium having a relatively high temperature may be introduced into the heat exchange plate 33 to heat the unit cell 11.

In other example embodiments of the present disclosure, the bottom plate 31 itself may also be a heat exchange plate 33, i.e. channels are provided in the bottom plate 31, and a heat exchange medium may be provided in the channels in the bottom plate 31. In this way, in the present embodiment, as compared with the previous embodiment, since it is not necessary to separately add one heat exchange plate 33 to the bottom plate 31, the thickness of the bottom plate 31 can be effectively reduced, the weight of the case 30 can be effectively reduced, and the weight of the battery device can be further reduced.

In this example embodiment, the heat exchange medium may be a phase change material, such as: water, acetic acid, and the like. However, the heat exchange medium is not limited thereto, and may be other materials, so long as heat exchange can be achieved, and details are not described here.

In one embodiment, the battery device may include a battery pack, and may further include other necessary components and compositions, which may be correspondingly supplemented by those skilled in the art according to the specific usage requirements of the battery device, and will not be described herein.

The terms "parallel" and "perpendicular" as used herein are not intended to be entirely parallel, perpendicular, but rather are subject to certain errors; for example, the included angle between the two is greater than or equal to 0 ° and less than or equal to 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 adaptations, 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 (12)

1. A battery device, characterized by comprising:

a plurality of battery assemblies (10), wherein the battery assemblies (10) comprise single batteries (11) and positioning pieces (12), and the positioning pieces (12) are positioned on one side of the single batteries (11);

and the busbar (20) is electrically connected with at least two single batteries (11), and the positioning piece (12) is used for positioning the busbar (20) and fixing the busbar (20).

2. The battery device according to claim 1, wherein a plurality of the battery modules (10) are arranged in order in a first direction, and the positioning member (12) is located on one side of the unit cells (11) in the first direction.

3. The battery device according to claim 2, wherein the battery assembly (10) further includes: the protection shell (13), battery cell (11) are located in the protection shell (13), setting element (12) with the protection shell (13) deviate from the one side of battery cell (11) and are connected.

4. A battery device according to claim 3, characterized in that the positioning member (12) has a receiving groove (121), the receiving groove (121) has an opening (122), and at least part of the busbar (20) is disposed in the receiving groove (121) through the opening (122) and abuts against a side wall of the receiving groove (121).

5. The battery device according to claim 4, wherein the bus bar (20) includes:

a main body (21) provided on one surface of the protective case (13) facing away from the single battery (11);

a first connection portion (22) and a second connection portion (23) respectively connected to both ends of the main body portion (21) in the first direction, and the first connection portion (22) and the second connection portion (23) each extend in a second direction, the first connection portion (22) and the second connection portion (23) being respectively electrically connected to two adjacent unit cells (11);

wherein at least part of the first connecting part (22) or at least part of the second connecting part (23) is positioned in the accommodating groove (121), and the second direction is the direction in which the main body part (21) points to the single battery (11).

6. The battery device according to claim 5, wherein the positioning member (12) includes:

the first limiting plate (123) is connected with one side of the protective shell (13) away from the single battery (11) and extends along the first direction;

the second limiting plate (124) is connected with one end of the first limiting plate (123) away from the protective shell (13) and extends in a direction away from the first limiting plate (123);

wherein, first limiting plate (123), second limiting plate (124) and protective housing (13) enclose holding tank (121), and at least part first connecting portion (22) or at least part second connecting portion (23) with inner wall and protective housing (13) of second limiting plate (124) are supported and are leaned on.

7. The battery device according to claim 6, wherein an end of the second limiting plate (124) remote from the first limiting plate (123) is provided with a slope portion (125), and at least a part of the first connecting portion (22) or at least a part of the second connecting portion (23) enters the accommodating groove (121) through the slope portion (125).

8. The battery device according to any one of claims 4 to 7, characterized in that the positioning member (12) is an elastic member, and the positioning member (12) applies a pre-tightening force to the busbar (20).

9. The battery device according to any one of claims 4 to 7, wherein in the battery assembly (10), two of the positioning members (12) are provided at a spacing, and openings (122) of two of the receiving grooves (121) are provided opposite to each other.

10. The battery device according to any one of claims 3 to 7, wherein the unit cells (11) have a length direction, and the positioning member (12) and the bus bar (20) are located on the same side of the unit cells (11) in the length direction.

11. The battery device according to claim 10, wherein the unit cell (11) further has a height direction, the unit cell (11) comprising:

and the battery pole (111) is positioned on the surface of the single battery (11) parallel to the height direction, and the battery pole (111) and the busbar (20) are positioned on the same side of the single battery (11) in the length direction.

12. The battery device according to claim 11, wherein the unit cell (11) further includes:

a battery case (112) including two first surfaces (113) disposed opposite each other, a second surface (114) disposed opposite each other, and two third surfaces (115) disposed opposite each other, the first surfaces (113) being perpendicular to the first direction, the second surfaces (114) being perpendicular to the height direction, the third surfaces (115) being perpendicular to the length direction;

the busbar (20) is arranged on one side, deviating from the third surface (115), of the protective shell (13), two battery poles (111) are arranged, two battery poles (111) are located on the same first surface (113) or two battery poles (111) are located on two third surfaces (115) which are oppositely arranged.