CN220253297U - Battery pack and electricity utilization device - Google Patents

Abstract

The utility model discloses a battery pack and an electricity utilization device, wherein the battery pack comprises a plurality of battery cells along a first direction and a second direction, single-layer battery cells are arranged along a third direction, each battery cell comprises a plurality of stacked electrode slices, the electrode slice arrangement directions of adjacent battery cells along the first direction and the second direction are mutually perpendicular, and in the charging and discharging process of the battery pack, the electrode slices in each battery cell expand in the stacking direction, and the electrode slice arrangement mode of each battery cell is different from that of the adjacent battery cells, so that the expansion directions of each battery cell are different, and the stress generated between the adjacent battery cells can be mutually counteracted. In other words, the volume of the battery cells in the battery pack can expand in the stacking direction of the pole pieces in the charging and discharging process, and the adjacent battery cells are in the non-stacking direction, so that space can be reserved for the adjacent battery cells, and for the whole battery pack, stress counteracts, the volume cannot expand, so that the battery pack is prevented from generating unidirectional deformation, and the stability and the cycle performance of the battery pack are improved.

Description

Battery pack and electricity utilization device

Technical Field

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

Background

The existing battery pack only comprises one battery core, the arrangement direction of pole pieces in the battery core is fixed, so that the volume of the battery pack expands towards the same direction in the charge and discharge process, stress is generated, the battery pack deforms in the circulation process, the uniformity of the distance between the pole pieces is further affected, local lithium precipitation of the battery pack is caused, the deformation of the battery pack is aggravated along with the increase of the charge and discharge times of the battery pack, the lithium precipitation condition is aggravated, and finally the battery pack is invalid.

Disclosure of Invention

In order to solve the above problems, the present utility model provides a battery pack, which includes a plurality of battery cells along a first direction and a second direction, wherein each battery cell includes a plurality of stacked electrode plates along a third direction, the electrode plates of adjacent battery cells along the first direction and the second direction are arranged in directions perpendicular to each other, the first direction and the second direction are in the same horizontal plane and perpendicular to each other, and the third direction is perpendicular to the first direction and the second direction.

Further, the battery pack comprises at least 4 adjacent electric cores along a first direction, comprises a plurality of adjacent electric cores along a second direction, is a single-layer electric core along a third direction, and the pole piece arrangement directions of the adjacent electric cores along the first direction and the second direction are mutually perpendicular.

Further, the dimension of the battery cell along the first direction is consistent with the dimension of the battery cell along the second direction.

Further, each cell comprises a positive plate, a diaphragm, a negative plate and an insulating film, the diaphragm is continuously folded in a Z shape, the positive plate and the negative plate are arranged between two adjacent faces of the diaphragm in a staggered mode, and the positive plate, the diaphragm and the negative plate are wrapped on the insulating film.

In another embodiment, the present application provides an electric device, including the above battery pack.

The beneficial effects are that: the application provides a battery pack, contains a plurality of electric cores, and every electric core includes a plurality of pole pieces of piling up, and the pole piece opposite direction of adjacent electric core, this kind of battery pack is in charge-discharge process, because the pole piece in every electric core all expands in the pile up the direction, and the pole piece arrangement of every electric core all is different with adjacent electric core, so every electric core expansion direction is different, and the stress that produces between the adjacent electric core can offset each other. In other words, the volume of the battery cells in the battery pack can expand in the stacking direction of the pole pieces in the charging and discharging process, and the adjacent battery cells are in the non-stacking direction, so that space can be reserved for the adjacent battery cells, and for the whole battery pack, stress counteracts, the volume cannot expand, so that the battery pack is prevented from generating unidirectional deformation, and the stability and the cycle performance of the battery pack are improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of the overall structure of a battery pack;

FIG. 2 is a top view of a battery pack;

fig. 3 is a front view of the battery pack;

FIG. 4 is a schematic diagram of a cell structure;

in the figure:

1, a battery pack; 11 cells; a 111 positive plate; 112 a separator; 113 negative plate; 114 an insulating film.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that, in the present utility model, the descriptions such as "first," "second," etc. are used for descriptive purposes only, and are not specifically meant to be in order or in a fair sense, nor are they intended to limit the present utility model solely for the purpose of distinguishing between components or operations described in the same technical language, but do not otherwise understand to indicate or imply relative importance or implying any particular order among or between such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Referring to fig. 1 to 3, fig. 1 is a schematic view of the overall structure of a battery pack, fig. 2 is a top view of the battery pack, and fig. 3 is a front view of the battery pack. The embodiment provides a battery pack for solving the technical problem that the battery pack is deformed in the charging and discharging processes to cause local lithium precipitation of the battery pack and finally cause the battery pack to fail. The battery pack 1 provided in this embodiment includes a plurality of battery cells 11 along a first direction and a second direction, and a single-layer battery cell 11 along a third direction, where each battery cell 11 includes a plurality of stacked pole pieces, the first direction and the second direction are in the same horizontal plane and are perpendicular to each other, and the third direction is perpendicular to the first direction and the second direction. Unlike the prior art, the pole pieces of adjacent cells 11 are arranged in directions perpendicular to each other in the first direction and the second direction.

Specifically, the battery pack 1 includes at least 4 adjacent cells 11 along the first direction, includes a plurality of adjacent cells 11 along the second direction, is a single-layer cell 11 along the third direction, and the pole piece arrangement directions of the adjacent cells 11 along the first direction and the second direction are all perpendicular to each other.

Referring to fig. 4, fig. 4 is a schematic diagram of a cell structure. Each cell 11 includes a positive electrode sheet 111, a diaphragm 112, a negative electrode sheet 113 and an insulating film 114, the diaphragm 112 is continuously folded in a Z-shape, the positive electrode sheet 111 and the negative electrode sheet 113 are alternately arranged between adjacent two sides of the diaphragm 112, and the positive electrode sheet 111, the diaphragm 112 and the negative electrode sheet 113 are all wrapped in the insulating film 114. When the battery pack 1 is charged and discharged, the pole pieces in each cell 11 expand in the stacking direction, and because the pole piece arrangement mode of each cell 11 is different from that of the adjacent cells 11, the expansion directions of each cell 11 are different, and the stress generated between the adjacent cells 11 can be mutually counteracted. In other words, the volume of the cells 11 in the battery pack 1 will expand in the stacking direction of the pole pieces during the charge and discharge process, and the adjacent cells 11 are in the non-stacking direction, so that space can be provided for the adjacent cells 11, and compared with the whole battery pack 1, the stress counteracts and the volume will not expand, thereby avoiding the single-direction deformation of the battery pack 1 and improving the stability and the cycle performance of the battery pack 1.

It should be noted that the dimensions of the battery cells 11 along the first direction and the second direction need to be consistent or similar as possible, and the number of pole pieces contained in each battery cell 11 is as small as possible, that is, the number of battery cells 11 in the battery pack 1 is as large as possible, so that the internal stress of the whole battery pack 1 can be released most uniformly, and the internal space is utilized most fully.

In another embodiment, the present application provides an electric device, which includes the battery pack 1.

The above is merely an embodiment of the present utility model, and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.

Claims (5)

1. The battery pack is characterized in that the battery pack (1) comprises a plurality of battery cells (11) along a first direction and a second direction, the battery cells (11) are single-layered along a third direction, each battery cell (11) comprises a plurality of stacked pole pieces, the pole piece arrangement directions of the adjacent battery cells (11) along the first direction and the second direction are all mutually perpendicular, the first direction and the second direction are in the same horizontal plane and are mutually perpendicular, and the third direction is perpendicular to the first direction and the second direction.

2. A battery pack according to claim 1, wherein the battery pack (1) comprises at least 4 adjacent cells (11) along the first direction, a plurality of adjacent cells (11) along the second direction, and the cells (11) are single-layered along the third direction, and the pole piece arrangement directions of the adjacent cells (11) along the first direction and the second direction are mutually perpendicular.

3. A battery pack according to claim 1, wherein the cells (11) are of uniform size in the first and second directions.

4. The battery pack according to claim 1, wherein each of the cells (11) comprises a positive electrode sheet (111), a separator (112), a negative electrode sheet (113) and an insulating film (114), the separator (112) is continuously folded in a Z-shape, the positive electrode sheet (111) and the negative electrode sheet (113) are alternately arranged between adjacent two sides of the separator (112), and the positive electrode sheet (111), the separator (112) and the negative electrode sheet (113) are all wrapped around the insulating film (114).

5. An electrical device, characterized by comprising a battery pack (1) according to any one of claims 1 to 4.