CN221239750U - Battery cell assembly and battery module - Google Patents

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to an electric core assembly and a battery module. The battery cell assembly comprises an insulating plate, a battery cell stacking body and a plurality of bus bars; the battery core stacking body comprises a plurality of battery cores, the battery cores are stacked along the thickness direction of the battery cores, and one end of each battery core, facing the insulating plate, is provided with a tab; the plurality of bus bars are positioned on one side of the insulating plate, which is opposite to the battery cell stacking body; the insulating plate and the bus bar are provided with holes corresponding to the lugs, the lugs of at least two non-adjacent electric cores are suitable for penetrating through the holes and are connected with the same bus bar, and the lugs of the two adjacent electric cores are not connected to the same bus bar. The beneficial effects include: enough space can be reserved between the lugs of the battery cell which needs to be electrically connected with the same bus bar, the welding area is increased, the connection reliability of the lug of the battery cell and the bus bar is improved, and therefore the product quality of the battery cell assembly and the battery module is improved.

Description

Battery cell assembly and battery module

Technical Field

The utility model belongs to the technical field of power batteries, and particularly relates to an electric core assembly and a battery module.

Background

With the development of new energy technology, the electric quantity requirement on the power battery is gradually increased, the single electric core is difficult to meet the use requirement, and a plurality of electric cores are often required to be connected in series and/or in parallel. At present, the common serial connection and/or parallel connection mode of the battery cells is to connect the lugs of the adjacent battery cells with the same connecting busbar, and as the distance between the lugs of the adjacent battery cells is smaller, the welding area between the lugs and the busbar is small, the welding operation is very inconvenient, the connection reliability between the battery cells is poor, and the product quality is difficult to ensure.

Disclosure of utility model

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a battery cell assembly and a battery module, which are used for solving the problems of limited welding space and inconvenient welding operation when the battery cell tab is connected with the busbar in the prior art, so as to improve the reliability and product quality of the battery cell assembly and the battery module.

To achieve the above and other related objects, the present utility model provides a cell assembly comprising:

An insulating plate;

The battery cell stacking body comprises a plurality of battery cells, the battery cells are stacked along the thickness direction of the battery cells, and one end of each battery cell, which faces the insulating plate, is provided with a tab; and

A plurality of bus bars positioned on one side of the insulating plate, which is opposite to the cell stack body;

The insulating plate and the bus bar are respectively provided with an opening corresponding to the electrode lugs, at least two non-adjacent electrode lugs of the battery cells are suitable for penetrating through the openings and are connected with the same bus bar, and the electrode lugs of the adjacent two battery cells are not connected with the same bus bar.

Optionally, the tab of each electric core includes a positive electrode tab and a negative electrode tab that are disposed at the same end of the electric core and distributed along the width direction of the electric core, where the positive electrode tab and the negative electrode tab are asymmetrically disposed along the width center line of the electric core.

Optionally, orthographic projections of the positive electrode tab and the negative electrode tab of two adjacent battery cells in the thickness direction of the battery cells are not overlapped.

Optionally, the positive electrode tabs of the non-adjacent odd-numbered multiple cells are arranged in a first row along the stacking direction of the cells, the negative electrode tab rows of the non-adjacent even-numbered multiple cells are arranged in a second row along the stacking direction of the cells, the negative electrode tabs of the non-adjacent odd-numbered multiple cells are arranged in a third row along the stacking direction of the cells, and the positive electrode tabs of the non-adjacent even-numbered multiple cells are arranged in a fourth row along the stacking direction of the cells.

Optionally, the tabs arranged in the same row are bent along the same direction and connected with the corresponding bus bars.

Optionally, two non-adjacent cells connected to the same bus bar are separated by one cell.

Optionally, the bus bars include connection bus bars, at least two non-adjacent tabs with the same polarity of the battery cells are connected with the same connection bus bar to form a parallel battery cell group in parallel, and the connection bus bars corresponding to the positive electrode tabs of the parallel battery cell group are electrically connected with the connection bus bars corresponding to the negative electrode tabs of another battery cell group through a connection portion.

Optionally, the length and width of the connection portion are smaller than the length and width of the connection bus bar.

Optionally, the busbar further includes an output electrode busbar, and in the stacking direction of the cells, part of the tabs of each group of parallel cell groups located at two side edges of the cell stack are formed into output tabs and connected with the output electrode busbar.

To achieve the above and other related objects, the present application also provides a battery module including the above-described battery cell assembly.

As described above, the battery cell assembly and the battery module of the utility model have at least the following beneficial effects: the non-adjacent electric cores are connected with the same bus bar, and the adjacent electric cores are not connected on the same bus bar, namely, at least one electric core which is not connected with the bus bar is separated between the electric cores connected with the same bus bar, so that enough space can be reserved between the lugs of the electric cores which are required to be electrically connected with the same bus bar, a welding area is enlarged, the connection reliability of the lugs of the electric cores and the bus bar is improved, and the product quality of an electric core assembly and a battery module is improved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of a cell assembly according to the present utility model;

FIG. 2 is a top view of the cell assembly of FIG. 1;

FIG. 3 is a top view of the cell assembly of FIG. 1 with the insulating plate removed;

FIG. 4 is a schematic diagram of the cell in FIG. 1;

FIG. 5 is a schematic view of the insulating plate of FIG. 1;

FIG. 6 is a schematic diagram of the connection bus and the output electrode bus of FIG. 1.

Description of the part reference numerals

Insulating plate 1, electric core 2, anodal utmost point ear 21, negative pole utmost point ear 22, width central line 23, connection busbar 3, connecting portion 4, output utmost point busbar 5, total positive busbar 51, total negative busbar 52, trompil 6.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1, in some alternative embodiments, the present application provides a battery module including a cell assembly.

Referring to fig. 1 to 4, in some alternative embodiments, the cell assembly includes an insulating plate 1, a cell stack, and a plurality of bus bars. The battery cell stacking body comprises a plurality of battery cells 2, the battery cells 2 are stacked along the thickness direction of the battery cells 2, and one end of each battery cell 2 facing the insulating plate 1 is provided with a tab; the plurality of bus bars are positioned on one side of the insulating plate 1, which is opposite to the battery cell stacking body; wherein, the insulating plate 1 and the bus bar are provided with openings 6 corresponding to the tabs, the tabs of at least two non-adjacent cells 2 are suitable for penetrating through the openings 6 and being connected with the same bus bar, and the tabs of two adjacent cells 2 are not connected with the same bus bar, that is, at least one cell 2 which is not connected with the bus bar is separated between two cells 2 connected with the same bus bar. In the present application, the stacking direction of the battery cells 2, the thickness direction of the battery cells 2, the length direction of the bus bars, and the width direction of the insulating plate 1 are the same, i.e., the Y direction in the drawing; the width direction of the battery cell 2, the width direction of the busbar and the length direction of the insulating plate 1 are the same, namely the X direction in the drawing; the height direction of the battery cell 2, the thickness direction of the bus bar and the thickness direction of the insulating plate 1 are the same, i.e., the Z direction in the drawing.

Optionally, a plurality of openings 6 distributed along the stacking direction of the battery cells 2 are arranged on the same bus bar, and the number of the openings 6 is smaller than or equal to the number of the battery cells 2 connected with the same. Further, the difference between the number of the battery cells 2 connected with the same bus bar and the number of the holes 6 on the bus bar is 1, specifically, the tab near the edge of the bus bar can directly pass through the hole 6 on the insulating board 1 near the edge of the bus bar and be bent to be connected with the bus bar.

Optionally, the tab of each battery cell 2 includes a positive electrode tab 21 and a negative electrode tab 22 disposed at the same end of the battery cell 2 and distributed along the width direction of the battery cell 2, where the positive electrode tab 21 and the negative electrode tab 22 are asymmetrically disposed along the width center line 23 of the battery cell 2, or the battery cell 2 has a first center line perpendicular to the width direction of the battery cell 2, and the distance D1 between the positive electrode tab 21 and the first center line of the battery cell 2 and the distance D2 between the negative electrode tab 22 and the first center line are unequal, where the first center line is the width center line 23 of the battery cell 2. Further, the positive projections of the positive electrode tab 21 and the negative electrode tab 22 of two adjacent battery cells 2 in the thickness direction of the battery cells 2 are not overlapped, or, the positive electrode tab 21 and the negative electrode tab 22 of two adjacent battery cells 2 are arranged at intervals in the width direction of the battery cells 2; the battery cell 2 includes a first end close to the positive electrode tab 21 and a second end far from the positive electrode tab 21, and the first end of the battery cell 2 and the second end of the adjacent battery cell 2 are located on the same side of the battery cell stack, that is, the first ends and the second ends of the plurality of battery cells 2 are alternately stacked. Further, the positive electrode tabs 21 of the non-adjacent odd-numbered multiple cells 2 are arranged in a first row along the stacking direction of the cells 2, the negative electrode tabs 22 of the non-adjacent even-numbered multiple cells 2 are arranged in a second row along the stacking direction of the cells 2, the negative electrode tabs 22 of the non-adjacent odd-numbered multiple cells 2 are arranged in a third row along the stacking direction of the cells 2, and the positive electrode tabs 21 of the non-adjacent even-numbered multiple cells 2 are arranged in a fourth row along the stacking direction of the cells 2; wherein, four rows of lugs are arranged into four rows along the width direction of the battery core 2; specifically, in this embodiment, 12 cells 2 are stacked and arranged along the thickness direction of the cells 2, and are arranged at ①、③、⑤、⑦、⑨ andThe positive electrode lugs 21 of the battery cells 2 on the odd digits are arranged in the first row and are arranged in ①、③、⑤、⑦、⑨ andThe negative electrode lugs 21 of the battery cells 2 on the odd digits are arranged in the third row and are arranged in ②、④、⑥、⑧、⑩ andThe positive electrode lugs 21 of the battery cells 2 on even numbers are arranged in a fourth row and are arranged in ②、④、⑥、⑧、⑩ andThe negative electrode lugs 22 of the battery cells 2 on even numbers are arranged in the second row. It will be appreciated that this embodiment is illustrated with a cell stack having 12 cells 2, and the number of cells 2 of the cell stack is not limited to the illustrated 12 cells.

Optionally, the tabs arranged in the same row are bent along the same direction and connected with the corresponding bus bars, so that the batch rolling bending processing of the tabs is facilitated, and sufficient space and space are reserved between the tabs connected with the same bus bar; the electrode lugs and the bus bars can be welded and fixed. Further, the positive electrode tab 21 and the negative electrode tab 22 of the same cell 2 are bent in opposite directions in the stacking direction of the cell 2 and are connected with corresponding bus bars; the bending directions of the cathode tabs 22 of the respective battery cells 2 may be the same, and the bending directions of the anode tabs 21 of the respective battery cells 2 may be the same.

Alternatively, one cell 2 is spaced between two non-adjacent cells 2 connected to the same bus bar, that is, one cell 2 is further disposed between two cells 2 connected to the same bus bar, it is understood that the space between two cells 2 connected to the same bus bar is not limited to the space between one cell 2, but may be two, three or more cells 2.

According to the battery cell assembly of the embodiment, the electrode lugs of the non-adjacent battery cells 2 are connected through the same bus bar, the electrode lugs of the adjacent battery cells 2 are not connected to the same bus bar, enough space is reserved between the electrode lugs of the battery cells 2 which are required to be electrically connected with the same bus bar, the space between the electrode lugs which are required to be electrically connected is increased, the welding area is increased, the welding of the electrode lugs and the bus bar is more convenient and reliable, the feasibility of the welding process of the welding area is increased, and the reliability and the product quality of the battery cell assembly and the battery module are improved.

Referring to fig. 1 to 6, in some alternative embodiments, the bus bar includes a connection bus bar 3, at least two non-adjacent tabs with the same polarity of the cells 2 are connected with the same connection bus bar 3 to form a parallel cell group in parallel, and the connection bus bar 3 corresponding to the positive tab 21 of the parallel cell group is electrically connected with the connection bus bar 3 corresponding to the negative tab 22 of another parallel cell group through a connection portion 4, so as to realize series connection between the parallel cell groups. Wherein the length and width of the connection portion 4 are smaller than the length and width of the connection bus bar 3.

Alternatively, a part of the connecting buses 3 is a positive connecting bus, and the other part of the connecting buses 3 is a negative connecting bus; the positive connection busbar is electrically connected with the positive electrode lug 21 of the battery cell 2, the negative connection busbar is connected with the negative electrode lug 22 of the battery cell 2, and the negative connection busbar and the positive connection busbar are electrically connected through the connecting part 4 so as to realize the series connection between the parallel battery cell groups. Wherein, positive connection busbar and the negative connection busbar that are connected through connecting portion 4 distribute along the width direction of electric core 2, and the overall arrangement is compact, convenient to connect.

Optionally, the number of the battery cells 2 of each group of parallel battery cell assemblies is at least two; in this embodiment, every three cells 2 are connected in parallel to form a set of parallel cell assemblies. Further, the three odd-numbered cells 2 located at ①、③ and ⑤ are connected in parallel to form a first parallel cell group, the three even-numbered cells 2 located at ②、④ and ⑥ are connected in parallel to form a second parallel cell group, the three odd-numbered cells 2 located at ⑦、⑨ and 3524 are connected in parallel to form a third parallel cell group, the three even-numbered cells 2 located at ⑧、⑩ and 3824 are connected in parallel to form a fourth parallel cell group, and the first parallel cell group, the second parallel cell group, the third parallel cell group and the fourth parallel cell group are sequentially connected in series. Specifically, in this embodiment, the positive electrode tab 21 of each cell 2 of the first parallel cell group is connected to the bus bar a1, the negative electrode tab 22 of each cell 2 of the first parallel cell group is connected to the bus bar a2, the positive electrode tab 21 of each cell 2 of the second parallel cell group is connected to the bus bar a3, the negative electrode tab 22 of each cell 2 of the second parallel cell group is connected to the bus bar a4, the positive electrode tab 21 of each cell 2 of the third parallel cell group is connected to the bus bar a5, the negative electrode tab 22 of each cell 2 of the third parallel cell group is connected to the bus bar a6, the positive electrode tab 21 of each cell 2 of the fourth parallel cell group is connected to the bus bar a7, the negative electrode tab 22 of each cell 2 of the fourth parallel cell group is connected to the bus bar a8, the bus bar a2 and the bus bar a3 are connected to each other through the connection portion 4, the bus bar a4 and the bus bar a5 are connected to each other through the connection portion 4, and the bus bar a6 and the bus bar a3 and the bus bar a4 are stacked in sequence, and the bus bar a3 and the bus bar a6 and the bus bar a3 are stacked.

According to the battery cell assembly of the embodiment, the welding area is increased between the battery cells 2 and 2 in a crossing interval parallel connection mode, so that the connection between the electrode lugs and the connecting busbar 3 is firmer and more reliable, the layout is compact, and the connection operation is simple and convenient.

Referring to fig. 1 to 6, in some alternative embodiments, the bus bar further includes an output electrode bus bar 5, and in the stacking direction of the cells 2, part of the tabs of each group of parallel cell groups located at both side edges of the cell stack are formed as output tabs and connected with the output electrode bus bar 5.

Optionally, the output electrode busses 5 include a total positive bus 51 and a total negative bus 52 for external electrical connection of the cell stack. The total positive busbar 51 may be electrically connected to the positive electrode tab 21 of each cell 2 of one parallel cell group, and the total negative busbar 52 may be electrically connected to the negative electrode tab 22 of each cell 2 of another parallel cell group. Specifically, in the present embodiment, the busbar a1 is a total positive busbar 51, the busbar a8 is a total negative busbar 52, the positive electrode tab 21 of each cell 2 of the first parallel cell group is connected to the total positive busbar 51, and the negative electrode tab 22 of each cell 2 of the fourth parallel cell group is connected to the total negative busbar 52.

In the battery cell assembly of the embodiment, part of the lugs of the partial battery cells 2 are directly used as the output lugs to be connected with the output electrode bus bars 5 so as to realize external electric connection of the battery cell stacking body, and the battery cell assembly is simple in structure and convenient to connect.

According to the battery cell assembly and the battery module, at least one battery cell 2 which is not connected with the same bus bar is arranged between the battery cells 2 connected with the same bus bar, namely, the welding area where the electrode lugs of the adjacent battery cells 2 are electrically connected with the bus bar is enlarged in a layout mode that the electrode lugs of the non-adjacent battery cells 2 are not connected with the same bus bar, and the welding process is high in feasibility, so that the reliability of the electrical connection between the battery cells 2 and the bus bar is improved, and the product quality of the battery cell assembly and the battery module is further improved.

In the description of the present specification, the descriptions of the terms "present embodiment," "example," "specific example," and the like, mean 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 present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. A cell assembly, comprising:

An insulating plate;

The battery cell stacking body comprises a plurality of battery cells, the battery cells are stacked along the thickness direction of the battery cells, and one end of each battery cell, which faces the insulating plate, is provided with a tab; and

A plurality of bus bars positioned on one side of the insulating plate, which is opposite to the cell stack body;

The insulating plate and the bus bar are respectively provided with an opening corresponding to the electrode lugs, at least two non-adjacent electrode lugs of the battery cells are suitable for penetrating through the openings and are connected with the same bus bar, and the electrode lugs of the adjacent two battery cells are not connected with the same bus bar.

2. The cell assembly of claim 1, wherein: each electrode lug of the battery cell comprises a positive electrode lug and a negative electrode lug which are arranged at the same end of the battery cell and distributed along the width direction of the battery cell, and the positive electrode lug and the negative electrode lug are asymmetrically arranged along the width central line of the battery cell.

3. The cell assembly of claim 2, wherein: the positive projections of the positive electrode lugs and the negative electrode lugs of the adjacent two battery cells in the thickness direction of the battery cells are not overlapped.

4. A cell assembly according to claim 3, wherein: the positive electrode lugs of the non-adjacent odd-numbered multiple battery cells are arranged in a first row along the stacking direction of the battery cells, the negative electrode lugs of the non-adjacent even-numbered multiple battery cells are arranged in a second row along the stacking direction of the battery cells, the negative electrode lugs of the non-adjacent odd-numbered multiple battery cells are arranged in a third row along the stacking direction of the battery cells, and the positive electrode lugs of the non-adjacent even-numbered multiple battery cells are arranged in a fourth row along the stacking direction of the battery cells.

5. The cell assembly of claim 4, wherein: the tabs arranged in the same row are bent along the same direction and are connected with the corresponding bus bars.

6. The cell assembly of any one of claims 1 to 5, wherein: and two non-adjacent electric cores connected with the same bus bar are separated by one electric core.

7. The cell assembly of any one of claims 2 to 5, wherein: the bus bars comprise connecting bus bars, at least two non-adjacent electrode tabs with the same polarity of the battery cells are connected with the same connecting bus bars to form a parallel battery cell group in parallel, and the connecting bus bars corresponding to the positive electrode tabs of the parallel battery cell group are electrically connected with the connecting bus bars corresponding to the negative electrode tabs of the other battery cell group through connecting parts.

8. The cell assembly of claim 7, wherein: the length and the width of the connecting part are smaller than those of the connecting bus bars.

9. The cell assembly of claim 7, wherein: the busbar also comprises an output electrode busbar, and in the stacking direction of the battery cells, part of the lugs of each group of parallel battery cell groups positioned at the edges of two sides of the battery cell stack body are formed into output lugs and are connected with the output electrode busbar.

10. A battery module, characterized in that: a cell assembly comprising any one of claims 1 to 9.