CN218448336U - Battery device - Google Patents

Abstract

The disclosure relates to the field of battery technology, and discloses a battery device; the battery device includes a battery pack and a connecting bus bar; the battery pack includes a plurality of single cells; the connecting bus bar is connected to a plurality of single cells at the end of the battery pack The connecting bus bar includes a connecting part, a turning part and a stacking part; the connecting part is connected to a plurality of single cells at the end of the battery pack; the turning part is connected to the connecting part, and a device is arranged between the turning part and the connecting part The included angle is fixed; the stacking part is connected to the folded part, and the stacking is arranged on the side of the folded part away from the battery pack. When the battery device connects the bus bar and the battery case by laser welding, it is not necessary to increase the laser welding power. The battery case is welded through.

Description

battery device

technical field

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

Background technique

With the rapid development of modern industry, the problems of environmental pollution, energy shortage and resource depletion have become more and more prominent. In order to maintain sustainable economic development, protect the human living environment and energy supply, zero-emission battery devices are the first choice as a new energy source.

However, the battery case of the current battery device is easily damaged during laser welding.

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

Utility model content

The purpose of the present disclosure is to overcome the disadvantage that the battery case of the related art is easily damaged during laser welding, and to provide a battery device in which the battery case is not easily damaged during laser welding.

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

A battery pack comprising a plurality of single cells;

A connection bus bar is connected to the plurality of single cells at the end of the battery pack, and the connection bus bar includes:

a connecting portion connected to the plurality of unit cells at an end portion of the battery pack;

The turning part is connected to the connecting part, and a set angle is set between the turning part and the connecting part;

The stacking portion is connected to the folded portion, and is stacked on a side of the folded portion away from the battery pack.

In the battery device of the present disclosure, the connecting bus bar includes a connecting portion connecting electrodes of a plurality of unit cells at the ends of the battery pack, and the battery pack can output current through the connecting portion. On the one hand, the connection bus bar also includes a folded part, the folded part is connected to the connection part, the flow area of the connected bus bar can be increased through the folded part, and the thickness of the connected bus bar can be set thinner. When arranging with the battery case, it is not necessary to increase the laser welding power, even if the thickness of the battery case is thin, it will not cause damage to the battery case, let alone cause the battery case to be welded through; another On the one hand, there is a set angle between the turning part and the connecting part, that is, the turning part is bent relative to the connecting part, and the space occupied by the turning part in the battery box can be reduced, and the space occupancy rate of the battery box can be improved , improve the energy density of the battery device; on the other hand, the connection bus bar also includes a lamination part, the lamination part is connected to the folded part, the flow area of the connection bus bar can be further increased through the lamination part, and the thickness of the connection bus bar can be set relatively Thin, when connecting the bus bar and the battery case by laser welding, there is no need to increase the laser welding power, even if the thickness of the battery case is thin, it will not cause damage to the battery case, and will not cause damage to the battery The shell is welded through; on the other hand, the laminated part is stacked on the side of the folded part away from the battery pack, so as to minimize the space occupied by the laminated part in the battery box, improve the space occupancy rate of the battery box, and increase the energy density of the battery device .

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 present disclosure.

Description of 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. Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can obtain other drawings according to these drawings without creative efforts.

FIG. 1 is a schematic perspective view of an exemplary embodiment of a battery device of the present disclosure.

FIG. 2 is a schematic perspective view of the connection busbar in FIG. 1 .

FIG. 3 is a schematic perspective view of the connecting busbar in FIG. 2 viewed from the side of the single battery.

FIG. 4 is a schematic perspective view of another connecting bus bar in FIG. 1 .

FIG. 5 is a schematic perspective view of another connecting bus bar in FIG. 1 .

Explanation of reference signs:

1. Battery pack; 11. Battery row; 111. Single battery; 1111. Battery casing; 1112. Battery pole; 12. Battery row; 1a, first battery pack; 1b, second battery pack;

2. Connect bus bar; 21. Connecting part; 211. First terminal connecting part; 212. Second terminal connecting part; 213. First connecting bar; 214. Second connecting bar; 22. Folding part; 221. Second A part; 222, the second part; 23, the lamination part;

3. Insulation layer;

4. Battery box; 41. Bottom plate; 42. Side frame;

X, the first direction; Y, the second direction; Z, the third direction.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, 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 example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions 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 only for convenience, for example, according to the description in the accompanying drawings directions for the example described above. It will be appreciated that if the illustrated device is turned over so that it is upside down, then elements described as being "upper" will become elements that are "lower". When a structure is "on" another structure, it may mean that a structure is integrally formed on another structure, or that a structure is "directly" placed on another structure, or that a structure is "indirectly" placed on another structure through another structure. other structures.

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 "have" are used to indicate an open and means that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first", "second" and "third" etc. only Used as a marker, not a limit on the number of its objects.

In this application, unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection, or It can be connected indirectly through an intermediary. "And/or" is just an association relationship describing associated objects, which means that there can be three kinds of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, and B exists alone. situation. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

An exemplary embodiment of the present disclosure provides a battery device. Referring to FIGS. 1-3 , the battery device may include a battery pack 1 and a connecting bus bar 2; 2 A plurality of single cells 111 connected to the end of the battery pack 1, the connection bus bar 2 may include a connecting portion 21, a folded portion 22 and a stacked portion 23; the connecting portion 21 is connected to a plurality of cells at the end of the battery pack 1 Single battery 111; the folded portion 22 is connected to the connecting portion 21, and a set angle is set between the folded portion 22 and the connecting portion 21; the stacking portion 23 is connected to the folded portion 22, and is stacked on the folded portion 22 The side facing away from the battery pack 1.

In the battery device of the present disclosure, the connecting bus bar 2 includes a connecting portion 21 connecting a plurality of single cells 111 at one end of the battery pack 1 , and the battery pack 1 can output current through the connecting portion 21 . On the one hand, the connection bus bar 2 also includes a folded portion 22, which is connected to the connection portion 21, and the flow area of the connection bus bar 2 can be increased by the folded portion 22, and the thickness of the connection bus bar 2 can be set to be relatively thin When connecting the bus bar 2 and the battery case 1111 by laser welding, it is not necessary to increase the laser welding power, even if the thickness of the battery case 1111 is relatively thin, the battery case 1111 will not be damaged, let alone It will cause the battery case 1111 to be welded through; on the other hand, there is a set angle between the folded part 22 and the connecting part 21, that is, the folded part 22 is bent relative to the connecting part 21, and the turning over can be reduced. The folding part 22 occupies the space in the battery box 4, improves the space occupancy rate of the battery box 4, and improves the energy density of the battery device; on the other hand, the connecting bus bar 2 also includes a stacking part 23, and the stacking part 23 is connected to the folded part 22 , the flow area of the connecting busbar 2 can be further increased through the lamination part 23, and the thickness of the connecting busbar 2 can be set relatively thin. When connecting the busbar 2 and the battery case 1111 by laser welding, it is not necessary to increase the laser welding power , even if the thickness of the battery case 1111 is relatively thin, it will not cause damage to the battery case 1111, and will not cause the battery case 1111 to be welded through; 22 is away from the side of the battery pack 1, so as to minimize the space occupied by the stacking part 23 in the battery box 4, improve the space occupancy rate of the battery box 4, and increase the energy density of the battery device.

In this exemplary embodiment, as shown in FIG. 1, the battery device may include a battery box 4, and the battery box 4 may include a bottom plate 41, a protective cover (not shown) and a side frame 42, and the bottom plate 41 and the protective cover may be provided It is rectangular, and a side frame 42 is arranged around the base plate 41 , and the side frames 42 are connected end to end to form a rectangular frame. The bottom plate 41 , the protective cover and the side frame 42 surround and form an accommodation space.

Of course, in other exemplary embodiments of the present disclosure, the bottom plate 41 and the protective cover can be set in a circle, ellipse, trapezoid, etc., and the side frame 42 can be formed around a circle, ellipse, trapezoid, etc., so that the battery box 4 The body is formed into a cylindrical shape, an elliptical column shape, a prism shape, and the like. The battery box 4 bodies can also be in other shapes, so they will not be described one by one here.

In this exemplary embodiment, referring to FIG. 1 , the battery pole 1112 in FIG. 1 is shown by a dotted line because it is blocked by the connecting busbar; a battery module is provided in the battery box 4, and the battery module can include Three battery packs 1, the battery pack 1 may include a plurality of single cells 111, and the single cells 111 may be cylinders. The single battery 111 may include a battery case 1111 and a cell. The battery casing 1111 can be set in a cylindrical shape, that is, the battery casing 1111 can include a first surface and a second surface oppositely arranged, the first surface and the second surface are both set in a circle, and between the first surface and the second surface There is a third surface connected between them, and the third surface is set as a cylindrical surface. Through holes are provided on the first surface.

In this exemplary embodiment, a battery cell is disposed in the containing portion of the battery case 1111 , and the battery cell is configured as a cylinder that fits the battery case 1111 . A cell protection film is provided outside the cell, and the cell protection film is set in a cylindrical shape that matches the cell, and a cell support plate is provided at the bottom of the cell, and the cell support plate and the cell protection film make The battery cells are insulated from the battery casing 1111 . A cell may include a plurality of positive sheets and a plurality of negative sheets.

A battery pole 1112 is provided on the side of the battery cell close to the first surface, and a plurality of positive pole pieces are connected to the battery pole 1112; the battery pole 1112 protrudes from the battery casing 1111 through the through hole on the first surface to form The first electrode of the single battery 111 may be a positive electrode. While a plurality of negative electrode sheets are connected to the first surface, the first surface and the entire battery case 1111 form the second electrode of the single battery 111 , and the second electrode may be a negative electrode. The positive and negative electrodes of the single cells 111 thus arranged are drawn out from the same side. Of course, the battery post 1112 can be the negative pole of the single battery 111 , and the first surface and the entire battery casing 1111 can be the positive pole of the single battery 111 .

The second surfaces of the plurality of single batteries 111 can be bonded to the bottom plate 41 of the battery box 4 by adhesive, so as to fix the plurality of single batteries 111 in the battery box 4 . This fixing method is simple and convenient, and the fixing is firmer.

Twelve single cells 111 are arranged along the first direction X to form a row of battery rows 11 ; multiple battery rows 11 are arranged in sequence along the second direction Y. A first gap is provided between two adjacent battery rows 11 , and a second gap is provided between two adjacent single cells 111 in the same battery row 11 . Two adjacent rows of battery rows 11 can be arranged in a dislocation, that is, the single cells 111 in one row of battery rows 11 are opposite to the second gap in the other row of battery rows 11 . It is set in such a way that a plurality of single cells arranged along the second direction Y form a battery row 12, but the single cells in one row are staggered, and four rows of battery rows 12 form a set of battery packs 1, and the battery pack 1 Both ends of the second direction Y are provided with four single cells 111, and the four single cells 111 are arranged in a row along the first direction X, that is, the four single cells 111 at one end of the battery pack 1 are flush. In addition, it is also possible to arrange four battery columns 11 to form a battery pack 1 .

Certainly, in some other exemplary embodiments of the present disclosure, two adjacent rows of battery columns 11 may not be arranged in a misaligned manner; that is, the single cells 111 in one row of battery rows 11 are opposite to the single cells 111 in the other row of battery rows 11 It is provided that the second gaps in one battery row 11 are opposite to the second gaps in the other battery row 11 . It is arranged in such a way that the plurality of single cells arranged along the second direction Y form a battery row 12 and there is no misalignment between the single cells in one row.

Three battery packs 1 are arranged in the first direction X to form a battery module, and the connecting bus bar 2 can be used to connect two adjacent battery packs 1 in series; therefore, in this example embodiment, two connecting bus bars are provided Row. The two adjacent battery packs 1 can be the first battery pack 1a and the second battery pack 1b, the connecting bus bar 2 can be used to connect the first battery pack 1a and the second battery pack 1b in series, and the connecting bus bar 2 can connect the first battery pack The electrodes of the four unit cells 111 at one end of the group 1a are connected to the electrodes of the four unit cells 111 at the same end of the second battery group 1b.

It should be noted that the above-mentioned numbers of battery rows 12, battery columns 11, and battery packs 1 are for illustration and do not constitute a limitation to the present disclosure. The number of battery columns 11 included in one battery pack 1 can be set as required. , the number of battery rows 12 included in a battery pack 1, and the number of battery packs 1 included in a battery module.

Referring to Fig. 1, Fig. 2 and Fig. 3, the connecting part 21 is connected to the electrodes of a plurality of single cells 111 at one end of the battery pack 1, specifically, the connecting part 21 is connected to the electrodes of the plurality of unit cells 111 at one end of the first battery pack 1a. The electrodes of the four single cells 111 are connected to the electrodes of the four single cells 111 at one end of the second battery pack 1b.

Specifically, the connecting part 21 may include a first connecting bar 213 , a second connecting bar 214 , a plurality of first terminal connecting parts 211 and a plurality of second terminal connecting parts 212 .

The plurality of first terminal connection parts 211 are connected to the first electrodes of the plurality of single cells 111 at one end of the first battery pack 1a in the second direction Y in one-to-one correspondence; specifically, the first terminal connection parts 211 are arranged along the The strip shape extending in the second direction Y, one end of the first terminal connecting portion 211 is connected to the upper end surface of the battery post 1112 . The plurality of second terminal connection parts 212 are connected to the second electrodes of the plurality of single cells 111 at one end of the second battery pack 1b in one-to-one correspondence; specifically, the second terminal connection parts 212 are arranged in an arc shape, The second terminal connection portion 212 is connected to the first surface of the battery case 1111 . The second terminal connecting portion 212 is disposed on a side of the battery pole 1112 close to the second connecting bar 214 .

The plurality of first terminal connecting portions 211 are all connected to the first connecting bar 213 , and the first connecting bar 213 is arranged in a strip shape extending along the first direction X. As shown in FIG. The plurality of second terminal connecting portions 212 are all connected to the second connecting bar 214 , and the second connecting bar 214 is arranged in a strip shape extending along the first direction X. As shown in FIG. Moreover, the second connecting bar 214 is connected to the first connecting bar 213 .

The first connection bar 213 , the second connection bar 214 , the plurality of first terminal connection parts 211 and the plurality of second terminal connection parts 212 are integrally formed.

Moreover, the first terminal connection part 211 is parallel to the upper end surface of the battery pole 1112, and the second terminal connection part 212 is parallel to the first surface of the battery case 1111; The upper end surface of the battery pole 1112 is parallel to the first surface of the battery case 1111 , therefore, the entire connecting portion 21 is basically parallel to the upper end surface of the battery pole 1112 .

In this exemplary embodiment, the folded portion 22 is connected to the connecting portion 21, and a set angle is set between the folded portion 22 and the connecting portion 21; the set angle is greater than or equal to 85° and less than or equal to 95°, and the folded portion The folded portion 22 extends toward the side of the unit battery 111 , that is, the folded portion 22 extends from the connecting portion 21 and is bent downward (closer to the side of the bottom plate 41 ). In this way, the flow area of the connecting busbar 2 can be increased through the folded part 22, and the thickness of the connecting busbar 2 can be set to be relatively thin. When connecting the busbar 2 and the battery case 1111 by laser welding, it is not necessary to raise the laser The welding power, even if the thickness of the battery case 1111 is relatively thin, will not cause damage to the battery case 1111, and will not cause the battery case 1111 to be welded through; The space in the battery box 4 is occupied in the X direction and the second direction Y, the space occupancy rate of the battery box 4 is increased, and the energy density of the battery device is increased.

2, the width of the folded portion 22 in the first direction X decreases as the distance from the connecting portion 21 increases, and the first direction X is parallel to the connecting line between the connecting portion 21 and the folded portion 22; Specifically, the folded portion 22 is configured as an isosceles trapezoid, and the lower base of the isosceles trapezoid is connected to the connecting portion 21 , and the upper base of the isosceles trapezoid is away from the connecting portion 21 . Since the connecting portion 21 and the folded portion 22 need to connect the battery packs 1 in series, and as the connecting portion 21 and the folded portion 22 approach the middle connection position of two adjacent battery packs 1, the number of connected battery rows increases, and the flow The current through the connecting part 21 and the folded part 22 increases, and the folded part 22 is set as an isosceles trapezoidal structure, which can further increase the flow area of the middle part to ensure the flow capacity, reduce the resistance, and ensure the battery module. Electrical performance; while the number of battery packs 1 connected to the edge of the connecting portion 21 and the folded portion 22 is relatively small, and the current passing through is relatively small, and the folded portion 22 is arranged as an isosceles trapezoidal structure, which can ensure the edge of the edge portion. In the case of overcurrent requirements, the weight of the connection part 21 and the folded part 22 is reduced.

Since the first battery pack 1a and the second battery pack 1b both include four battery rows and are arranged symmetrically, the folded portion 22 is arranged in an isosceles trapezoidal structure to ensure the uniformity of resistance and current.

In addition, referring to Fig. 2, the first part 221 and the second part 222 are separated by a dotted line in the figure, and the folded part 22 may include the first part 221 and the second part 222; the first part 221 is connected to the first connecting bar 213; The part 222 is connected to the second connecting bar 214 , and the second part 222 is connected to the first part 221 . Since the first battery pack 1a and the second battery pack 1b both include four rows of battery columns 11, the first part 221 and the second part 222 can be arranged symmetrically, the first part 221 can be set as a right-angled trapezoid, and the second part 222 can be set as a right-angled trapezoid. Trapezoid, the right-angled waist of two right-angled trapezoids is a side, the lower bases of two right-angled trapezoids are connected to form the lower base of an isosceles trapezoid, and the upper bases of two right-angled trapezoids are connected to form an upper base of an isosceles trapezoid, The oblique sides of the two right-angled trapezoids are the same.

In some other exemplary embodiments of the present disclosure, for example, in the case where the first battery pack 1a includes four battery rows 12, but the second battery pack 1b includes two battery rows 12, the folded portion 22 may be set as In the non-isosceles trapezoidal structure, the waist on the side of the first battery pack 1a can be set with a smaller inclination angle, while the waist on the side of the second battery pack 1b can be set with a larger inclination angle. That is, the inclination angle of the oblique waist of the right-angled trapezoid on the side of the first battery pack 1a is smaller than the inclination angle of the oblique waist of the right-angled trapezoid on the side of the second battery pack 1b.

Please continue to refer to FIG. 2 , the lamination portion 23 is connected to the folded portion 22 and is located on a side of the folded portion 22 away from the battery pack 1 . The flow area of the connecting busbar 2 can be further increased by the lamination part 23, and the thickness of the connecting busbar 2 can be set relatively thin. When connecting the busbar 2 and the battery case 1111 by laser welding, it is not necessary to increase the laser welding power. Even if the thickness of the battery case 1111 is relatively thin, it will not cause damage to the battery case 1111, and will not cause the battery case 1111 to be welded through; The space in the battery box 4 is occupied in the two directions Y, the space occupancy rate of the battery box 4 is increased, and the energy density of the battery device is increased.

In this exemplary embodiment, the stacked portion 23 can be arranged as one layer, and the stacked portion 23 is connected to the side edge of the folded portion 22 away from the connecting portion 21, and the stacked portion 23 and the folded portion 22 are basically arranged in parallel; the stacked portion 23 The width in the first direction X increases as the distance from the connecting portion 21 increases; specifically, the laminated portion 23 is arranged in the shape of an isosceles trapezoid, and the lower base of the isosceles trapezoid is connected to the folded portion 22, etc. The upper base of the waist trapezoid is far away from the folded portion 22 . Since the number of connected battery rows increases as the stacked portion 23 approaches the middle connection position of two adjacent battery packs 1, the current flowing through the stacked portion 23 increases, and the stacked portion 23 is arranged as an isosceles trapezoidal structure, which can Further increase the flow area of the middle part, reduce the resistance, and ensure the electrical performance of the battery module.

Since the first battery pack 1 a and the second battery pack 1 b both include four battery rows 12 arranged symmetrically, the laminated portion 23 is arranged in an isosceles trapezoidal structure to ensure the uniformity of resistance and current.

The laminated part 23 and the folded part 22 are integrally formed structures, and the laminated part 23 and the folded part 22 are unfolded on a plane, and the laminated part 23 and the folded part 22 form an isosceles trapezoid as a whole. The laminated portion 23 is formed by extending the folded portion 22 and bending it upward (the side away from the bottom plate 41 ).

In some other exemplary embodiments of the present disclosure, for example, in the case where the first battery pack 1a includes four rows of battery rows 12, but the second battery pack 1b each includes two rows of battery rows 12, the lamination part 23 may be set as In the non-isosceles trapezoidal structure, the waist on the side of the first battery pack 1a can be set with a smaller inclination angle, while the waist on the side of the second battery pack 1b can be set with a larger inclination angle. In addition, the lamination part 23 can be arranged as a two-layer, three-layer or more layer structure, which can be arranged according to the magnitude of the current and the accommodation space inside the battery.

In this exemplary embodiment, as shown in FIG. 3 , the battery module may further include an insulating layer 3 disposed between the battery pack 1 and the connection bus bar 2 . Specifically, the insulating layer 3 is disposed between the first connection bar 213 and the single battery 111 , and between the first portion 221 and the single battery 111 . Since a plurality of first terminal connecting parts 211 are connected to the battery pole 1112, and the battery pole 1112 is used as a positive pole, and the first connecting bar 213 is connected to a plurality of first terminal connecting parts 211, it is necessary to avoid the connection between the first connecting bar 213 and the negative pole. The battery case 1111 contacts and short-circuits, therefore, an insulating layer 3 is provided between the first connection bar 213 and the single battery 111; similarly, the first part 221 is connected to a plurality of first terminal connection parts 211 through the first connection bar 213 , it is also necessary to prevent the first part 221 from being in contact with the negative electrode of the battery case 1111 to cause a short circuit. Therefore, an insulating layer 3 is provided between the first part 221 and the single battery 111 .

Further, the insulating layer 3 can be extended and bent to the side wall of the first part 221 away from the connection part 21; The side wall of the part 221 away from the connection part 21; on the side of the first part 221 connected to the laminated part 23, the insulating layer 3 can be extended and bent to the connection structure of the laminated part 23 and the folded part 22 away from the connection part 21 side wall. Such setting can further increase the creepage distance.

Of course, in some other exemplary embodiments of the present disclosure, the insulating layer 3 may further extend and be bent to a side of the laminated portion 23 away from the folded portion 22 .

Referring to Fig. 1 and Fig. 4, the connecting bus bar 2 can also be connected only to a plurality of single cells at one end of a battery pack 1, as the general positive pole and the general negative pole of the whole battery module. The connecting bus bar 2 as the overall positive pole may include a connecting portion 21 , a folded portion 22 and a laminated portion 23 . The connection part 21 may include the first terminal connection part 211 and the first connection bar 213 , but not the second terminal connection part 212 and the second connection bar 214 . The folded portion 22 is connected to the connecting portion 21 and bent downwards, and is substantially perpendicular to the connecting portion 21 . The folded portion 22 can be configured as a rectangular flat plate. The lamination portion 23 is connected to the folded portion 22 , and the lamination portion 23 is bent away from the single battery. The lamination portion 23 and the folded portion 22 are also substantially vertically arranged.

Referring to FIG. 1 and FIG. 5 , the connection bus bar 2 serving as the general negative electrode may include a connecting portion 21 , a folded portion 22 and a laminated portion 23 . The connection part 21 may include the second terminal connection part 212 and the second connection bar 214 instead of the first terminal connection part 211 and the first connection bar 213 . The folded portion 22 is connected to the connecting portion 21 and bent downwards, and is substantially perpendicular to the connecting portion 21 . The folded portion 22 can be configured as a rectangular flat plate. The laminated part 23 is connected to the folded part 22. Since the laminated part 23 needs to be connected with other structures, the laminated part 23 is bent away from the single battery, and the laminated part 23 and the folded part 22 are also basically vertically arranged.

The "parallel" and "perpendicular" mentioned in this application are not completely parallel or perpendicular, but have certain errors; for example, if the angle between the two is greater than or equal to 0° and less than or equal to 5°, it is considered The two are parallel to each other; the angle between the two is greater than or equal to 85° and less than or equal to 95°, that is, the two are considered to be perpendicular to each other.

Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The specification and examples are to be considered exemplary only, with the true scope and spirit of the disclosure indicated by the appended claims.

Claims (12)

1. A battery device, characterized in that, comprising: A battery pack comprising a plurality of single cells; A connection bus bar, connected to the plurality of single cells at the end of the battery pack, the connection bus bar includes: a connection part connected to a plurality of the single cells at the end of the battery pack; The turning part is connected to the connecting part, and a set angle is set between the turning part and the connecting part; The stacking portion is connected to the folded portion, and is stacked on a side of the folded portion away from the battery pack. 2 . The battery device according to claim 1 , wherein the set included angle is greater than or equal to 85° and less than or equal to 95°, and the folded portion extends toward the side of the single battery. 3 . The battery device according to claim 1 , wherein the laminated portion is formed by folding the folded portion. 4 . 4 . The battery device according to claim 1 , wherein the battery packs are provided in at least two groups, and the connecting bus bar is used to connect two adjacent groups of the battery packs in series. 5 . The battery device according to claim 4 , wherein the width of the folded portion in the first direction decreases as the distance from the connecting portion increases, and the first direction is in line with the connecting portion. The connecting portion is parallel to the connecting line of the folded portion. 6 . The battery device according to claim 4 , wherein the laminated portion is connected to an edge of the side of the folded portion away from the connecting portion, and the width of the laminated portion in the first direction varies with The distance from the connecting portion increases, and the first direction is parallel to a connecting line between the connecting portion and the folded portion. 7. The battery device according to claim 6, wherein at least two groups of the battery packs comprise a first battery pack and a second battery pack, and the connection part comprises: a plurality of first terminal connection parts corresponding to the first electrodes of the plurality of unit cells connected to one end of the first battery pack; a plurality of second terminal connection parts corresponding to the second electrodes of the plurality of unit cells connected to one end of the second battery pack; a first connection bar connected to a plurality of the first terminal connection parts; The second connection bar is connected to the plurality of second terminal connection parts, and the second connection bar is connected to the first connection bar. 8. The battery device according to claim 7, wherein the folded portion comprises: The first part is connected to the first connecting bar; The second part is connected to the first part and connected to the second connecting bar. 9. The battery device according to claim 8, wherein the battery device further comprises: The insulating layer is arranged between the battery pack and the connecting bus bar. 10. The battery device according to claim 9, wherein the single battery is a cylindrical battery, the single battery includes a battery casing and a battery pole, and the battery pole is a first electrode, so The battery casing is the second electrode. 11. The battery device according to claim 10, wherein the insulating layer is disposed on a side wall of the first connecting bar close to the unit battery, and the first part is close to the unit battery one side wall. 12 . The battery device according to claim 11 , wherein the insulating layer extends and bends to a side wall of the first portion facing away from the connection portion. 13 .

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