CN220797011U - Battery cell connecting sheet, battery pack and electricity utilization device - Google Patents

Abstract

The utility model discloses a battery cell connecting sheet, a battery pack and an electricity utilization device, wherein the battery cell connecting sheet comprises: a fixing part; the two connecting parts are respectively arranged at two sides of the fixing part and are used for being electrically connected with the battery module; and the two flexible parts are connected between the fixing part and the connecting part, so that the connecting part is bent after being connected with the battery module. Wherein, the flexible portion sets up between fixed part and connecting portion for the connecting portion can be for flexible portion bending type after the battery module welding, under the limited circumstances in space, makes a plurality of battery modules can set up along the length direction and the width direction of battery package respectively.

Description

Battery cell connecting sheet, battery pack and electricity utilization device

Technical Field

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

Background

With the popularization of new energy sources by the country, the battery is widely applied to life and industry. In the application of the large-scale energy storage system, the expansion of the capacity and the power characteristic of the energy storage system is realized by connecting single batteries in parallel or in series so as to support the application of large current.

In the related art, when the battery cells with the positive and negative poles oppositely placed are connected, the welding is difficult to carry out due to limited space.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the battery cell connecting piece, the flexible part is arranged between the fixing part and the connecting part, so that the connecting part can be bent relative to the flexible part after the battery modules are welded, and under the condition of limited space, the plurality of battery modules can be respectively arranged along the length direction and the width direction of the battery pack.

The utility model further provides a battery pack.

The utility model further provides an electric device.

According to an embodiment of the first aspect of the present utility model, a cell connecting sheet includes: a fixing part; the two connecting parts are respectively arranged at two sides of the fixing part and are used for being electrically connected with the battery module; and the two flexible parts are connected between the fixing part and the connecting part, so that the connecting part is bent after being connected with the battery module.

According to the battery cell connecting piece provided by the embodiment of the utility model, the flexible part is arranged between the fixing part and the connecting part, so that the connecting part can be bent relative to the flexible part after the battery modules are welded, and the plurality of battery modules can be respectively arranged along the length direction and the width direction of the battery pack under the condition of limited space.

According to some embodiments of the utility model, the fixing portion includes: the first plate part extends on the horizontal plane, the two second plate parts are respectively connected with two sides of the first plate part and form a matching space with the first plate part in a surrounding mode, and the second plate parts are connected with the flexible parts.

According to some embodiments of the utility model, the first plate portion is provided with a first through hole, and the first through hole is used for being fixedly connected or matched with a cross beam on the tray in a positioning way; and/or the number of the groups of groups,

the second plate part is provided with a second through hole which is used for being fixedly connected or matched with the cross beam on the tray in a positioning way.

According to some embodiments of the utility model, the connecting part is provided with a positioning hole, and the positioning hole is used for positioning when the connecting part is connected with the battery module.

According to some embodiments of the utility model, the flexible portion is provided with an insulating sleeve on the outside.

According to some embodiments of the utility model, the cell connection sheet is composed of a plurality of laminated aluminum foils.

According to some embodiments of the utility model, the thickness of the cell connection piece is h, and h satisfies the relation: h is more than or equal to 2mm and less than or equal to 3mm.

A battery pack according to an embodiment of the second aspect of the present utility model includes: a tray in which a plurality of cross members extending in a width direction are provided to divide the tray into a plurality of accommodation spaces; the battery modules are respectively arranged in the accommodating spaces; and the two adjacent battery modules in the length direction are electrically connected through the electric core connecting sheet.

According to some embodiments of the utility model, the battery module includes: the battery pack comprises a plurality of battery cells, wherein the battery cells are stacked along the width direction, a pole is arranged on each battery cell, the pole is positioned on two sides of the length direction of the battery pack, and the battery cell connecting parts are electrically connected with the pole.

An electrical device according to an embodiment of the third aspect of the present utility model includes: the battery pack.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

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

fig. 2 is a schematic connection diagram of a battery module and an expanded state of a battery cell connecting sheet according to an embodiment of the utility model;

FIG. 3 is a partial schematic view of FIG. 2;

fig. 4 is a schematic connection diagram of a bending state of a battery cell connecting piece and a battery module according to an embodiment of the utility model;

FIG. 5 is a partial schematic view of FIG. 4;

fig. 6 is a schematic structural view of a cell connecting sheet according to an embodiment of the present utility model;

fig. 7 is a schematic view of a cell connector in an unfolded state according to an embodiment of the present utility model;

fig. 8 is a schematic structural view of a cell connecting piece in a bent state according to an embodiment of the present utility model.

Reference numerals:

100. a battery pack;

10. a cell connecting sheet; 11. a fixing part; 111. a first plate portion; 112. a second plate portion; 113. a first through hole; 114. a second through hole; 12. a connection part; 121. positioning holes; 13. a flexible portion;

20. a tray; 21. a cross beam;

30. a battery module; 31. a battery cell; 311. a pole.

Detailed Description

Embodiments of the present utility model will be described in detail below, by way of example with reference to the accompanying drawings.

The following describes a cell connection sheet 10 according to an embodiment of the present utility model with reference to fig. 1 to 8, and also proposes a battery pack 100 having the cell connection sheet 10, and an electric device having the battery pack 100.

The size of the battery is close to 1m long, the batteries are arranged along the X direction (the running direction of the automobile), the connecting sheets can be welded on the side face, and if a plurality of modules are arranged, the connection among the modules can be realized by punching the aluminum connecting sheets.

The battery pack 100 of a partial vehicle type adopts a 'short knife' scheme, the length of a blade battery is about 500-600mm, the internal resistance of the battery is relatively low, the arrangement direction is along the width direction, and a plurality of modules can be arranged side by side due to the small length size of the battery core 31, but the space layout is limited.

Referring to fig. 2 to 8, the cell connection pad 10 includes: a fixed part 11, two connecting parts 12 and two flexible parts 13. The cell connection pieces 10 are electrically connected with the adjacent battery modules 30, respectively, thereby connecting the adjacent battery modules 30.

It is understood that two connection parts 12 are respectively provided at both sides of the fixing part 11, and the connection parts 12 are used to electrically connect with the battery module 30. Specifically, the connecting portion 12 and the fixing portion 11 are both hard structures that are not easily deformed, the two connecting portions 12 are respectively located at both sides of the fixing portion 11 in the width direction, one connecting portion 12 is in contact with one battery module 30, the other connecting portion 12 is in contact with the other battery module 30, and the connecting portion 12 and the battery module 30 are fixedly connected in a welding manner, so that two adjacent battery modules 30 are electrically connected.

Further, since the connecting part 12 and the fixing part 11 are both hard structures which are not easily deformed, it is possible to facilitate the welding of the connecting part 12 and the battery module 30, and the fixing part 11 and the cross member 21 to be fixedly connected.

As shown in fig. 3, the flexible part 13 is connected between the fixing part 11 and the connecting part 12 to be bent after the connecting part 12 is connected with the battery module 30. Specifically, the flexible portion 13 is a deformable flexible structure, one side of the flexible portion 13 is connected to the fixing portion 11, the other side is connected to the connecting portion 12, and the two flexible portions 13 are respectively disposed between the fixing portion 11 and the connecting portion 12, so that the connecting portion 12 can be bent with respect to the flexible portion 13. Further, the arc is provided at the connection portion between the flexible portion 13 and the fixing portion 11, so that the tolerance of the manufacturing error and the mounting error of the cell connecting piece 10 can be improved.

Firstly, two battery modules 30 are arranged side by side, namely, the two battery modules 30 are arranged along the width direction of the battery pack 100, and the battery cell connecting sheet 10 is arranged between the two battery modules 30; then, the connection part 12 and the battery module 30 are electrically connected by laser welding; finally, the flexible portion 13 is bent manually or mechanically such that the connection portion 12 is bent with respect to the flexible portion 13 to arrange the two modules in the length direction of the battery pack 100, so that the plurality of battery modules 30 can be arranged in the length direction and the width direction, respectively.

Thereby, the flexible portion 13 is disposed between the fixing portion 11 and the connection portion 12 such that the connection portion 12 may be bent with respect to the flexible portion 13 after the battery modules 30 are welded, and in the case of limited space, such that the plurality of battery modules 30 may be disposed along the length direction and the width direction of the battery pack 100, respectively.

As shown in fig. 7 and 8, the fixing portion 11 includes: the first plate portion 111 and two second plate portions 112, the first plate portion 111 extends in a horizontal plane, the two second plate portions 112 are respectively connected with both sides of the first plate portion 111, and the two second plate portions 112 and the first plate portion 111 surround to form a fitting space, and the second plate portion 112 is connected with the flexible portion 13.

It will be appreciated that the fixing portion 11 includes a first plate portion 111 and a second plate portion 112, the second plate portion 112 being two, the first plate portion 111 extending in a horizontal plane, the first plate portion 111 being parallel to the horizontal plane, one side of the first plate portion 111 being connected to one side of one of the second plate portions 112, the other side of the first plate portion 111 being connected to one side of the other second plate portion 112, the other side of the second plate portion 112 being connected to the flexible portion 13, i.e. the flexible portion 13 being connected between the second plate portion 112 and the connecting portion 12.

That is, the two second plate portions 112 are bent with respect to the first plate portion 111, and the first plate portion 111 and the second plate portion 112 define a fitting space that is matched with the cross member 21, that is, the two second plate portions 112 are sandwiched between both sides of the cross member 21, so that the mounting and fixing of the cell connecting piece 10 can be realized.

Further, the first plate portion 111 is provided with a first through hole 113, and the first through hole 113 is used for being fixedly connected or matched with the beam 21 on the tray 20 in a positioning manner. Specifically, the first plate portion 111 is provided with a plurality of first through holes 113 penetrating the first plate portion 111 from top to bottom, part of the first through holes 113 can be used for positioning and matching of the fixing portion 11 and the structure on the beam 21, the other part of the first through holes 113 can be used for fixedly connecting the fixing portion 11 and the beam 21, the cell connecting sheet 10 can be fixedly connected with the beam 21 on the tray 20 in a threaded or welded mode, and the connection strength of the cell connecting sheet 10 and the beam 21 is ensured.

Alternatively, the second plate 112 is provided with a second through hole 114, and the second through hole 114 is used for being fixedly connected or matched with the beam 21 on the tray 20 in a positioning manner. The second plate portion 112 is attached to a side surface of the beam 21, and a second through hole 114 is formed in the second plate portion 112, the second through hole 114 penetrates through the second through hole 114 along a vertical direction of the second plate portion 112, and the second through hole 114 is fixedly connected with the beam 21, so that the battery cell connecting piece 10 is prevented from shaking, and the connecting portion 12 is prevented from being separated from the battery module 30.

Further, the connection part 12 is provided with a positioning hole 121, and the positioning hole 121 is used for positioning when being connected with the battery module 30. Specifically, the connecting portion 12 is attached to the side surface of the battery module 30, the connecting portion 12 and the battery module 30 may be fixedly connected by using a laser welding manner, the positioning hole 121 is located at the middle part of the connecting portion 12, and the welding position is determined by laser probing the position of the positioning hole 121 during the laser welding process, so that the connecting position of the connecting portion 12 and the battery module 30 is welded.

In some embodiments, an insulating sleeve is arranged on the outer side of the flexible portion 13, and the insulating sleeve wraps the outer peripheral side of the flexible portion 13 to insulate the flexible portion 13, so that the insulating performance of the cell connecting sheet 10 is improved, and the service life is prolonged.

In some embodiments, the cell connector 10 is made up of a plurality of overlapping aluminum foils. The electric core connection piece 10 is formed by stacking a plurality of aluminum foils, a hard structure is formed by locally adopting hot-press welding, namely, the fixing part 11 and the connecting part 12 adopt hot-press welding, so that the fixing part 11 and the connecting part 12 form a hard structure and are not easy to deform, the fixing part 11 is fixedly connected with the cross beam 21, the connecting part 12 is fixedly welded with the battery modules 30, and therefore, the two adjacent battery modules 30 are connected, and the communication of the plurality of battery modules 30 is realized.

As shown in fig. 6, the thickness of the cell connection pad 10 is h, and h satisfies the relation: h is more than or equal to 2mm and less than or equal to 3mm. That is, the thickness of the cell connecting piece 10 ranges from 2mm to 3mm, the conductivity of the cell connecting piece 10 is ensured, if the thickness of the cell connecting piece 10 is smaller than 2mm, the thickness of the cell connecting piece 10 is too thin, the strength of the cell connecting piece 10 is insufficient, and the flexible part 13 may be broken in the bending process; if the thickness of the cell connection piece 10 is greater than 3mm, the thickness of the cell connection piece 10 is too thick, and the aluminum foil at the connection position of the flexible portion 13 and the fixing portion 11 may be separated during the bending process.

As shown in fig. 1, the battery pack 100 includes: the battery pack comprises a tray 20, a plurality of battery modules 30 and a battery cell connecting sheet 10, wherein a plurality of cross beams 21 extending in the width direction are arranged in the tray 20 so as to divide the tray 20 into a plurality of accommodating spaces; the plurality of battery modules 30 are respectively arranged in the plurality of accommodating spaces; two battery modules 30 adjacent in the length direction are electrically connected by the cell connecting sheet 10.

Referring to fig. 1-4, the battery module 30 includes a plurality of battery cells 31, the plurality of battery cells 31 are stacked along a width direction, the battery cells 31 are provided with a pole 311, the pole 311 is located at two sides of the battery pack 100 along a length direction, and a connection portion of the battery cells 31 is electrically connected with the pole 311. That is, each battery module 30 includes a plurality of battery cells 31, each of the plurality of battery cells 31 is disposed adjacent to each other in the width direction of the battery pack 100, and the two ends of the battery cells 31 in the length direction are provided with the poles 311, that is, the poles 311 are disposed in the length direction of the battery pack 100, the battery connection parts are welded to the poles 311 on the adjacent battery modules 30, one of the connection parts 12 is welded to the adjacent one of the battery modules 30, and the other connection part 12 is welded to the adjacent other battery module 30, thereby electrically connecting the adjacent battery modules 30.

An electrical device according to an embodiment of the third aspect of the present utility model includes: and a battery pack 100.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A cell connection pad, comprising:

a fixing part (11);

the two connecting parts (12), the two connecting parts (12) are respectively arranged at two sides of the fixed part (11), and the connecting parts (12) are used for being electrically connected with the battery cell (31);

and two flexible parts (13), wherein the flexible parts (13) are connected between the fixing part (11) and the connecting part (12) so as to be bent after the connecting part (12) is connected with the battery module (30).

2. The cell connecting tab according to claim 1, characterized in that the fixing portion (11) comprises: the device comprises a first plate part (111) and two second plate parts (112), wherein the first plate part (111) extends on a horizontal plane, the two second plate parts (112) are respectively connected with two sides of the first plate part (111) and form a matching space by surrounding the first plate part (111), and the second plate parts (112) are connected with the flexible part (13).

3. The cell connecting piece according to claim 2, characterized in that a first through hole (113) is arranged on the first plate part (111), and the first through hole (113) is used for being fixedly connected or matched with a cross beam (21) on the tray (20) in a positioning way; and/or the number of the groups of groups,

the second plate part (112) is provided with a second through hole (114), and the second through hole (114) is used for being fixedly connected or matched with a cross beam (21) on the tray (20) in a positioning way.

4. The cell connecting piece according to claim 1, characterized in that a positioning hole (121) is provided on the connecting portion (12), the positioning hole (121) being used for positioning when being connected with the cell (31).

5. A cell connection tab according to claim 1, characterized in that the outside of the flexible portion (13) is provided with an insulating sleeve.

6. The cell connection piece according to claim 1, characterized in that the cell connection piece (10) is composed of a plurality of overlapping aluminum foils.

7. The cell connection piece according to claim 1, characterized in that the thickness h of the cell connection piece (10) is h, h satisfying the relation: h is more than or equal to 2mm and less than or equal to 3mm.

8. A battery pack, comprising:

a tray (20), wherein a plurality of cross beams (21) extending in the width direction are arranged in the tray (20) to divide the tray (20) into a plurality of accommodation spaces;

a plurality of battery modules (30), wherein the battery modules (30) are respectively arranged in the accommodating spaces;

the cell connecting sheet (10) according to any one of claims 1 to 7, wherein two of the battery modules (30) adjacent in the longitudinal direction are electrically connected by the cell connecting sheet (10).

9. The battery pack according to claim 8, wherein the battery module (30) includes: the battery pack comprises a plurality of battery cells (31), wherein the battery cells (31) are stacked along the width direction, a pole column (311) is arranged on the battery cells (31), the pole column (311) is located at two sides of the length direction of the battery pack (100), and the connecting part of the battery cells (31) is electrically connected with the pole column (311).

10. An electrical device, comprising: the battery pack (100) of claim 9.