CN219534832U - Battery cell collecting and connecting assembly and lithium battery - Google Patents

Abstract

The utility model discloses a battery core acquisition and connection assembly and a lithium battery, and belongs to the field of lithium battery manufacturing. The bus bar and sampling assembly are respectively connected to two opposite sides of the length direction of the tray, namely, the tray separates the bus bar from the sampling assembly, and meanwhile, the bus bar and the sampling assembly penetrate through the tray to be electrically connected. According to the utility model, the sampling assembly is isolated from the bus bar by using the tray, so that the bus bar can be widened as much as possible, the problem of insufficient overcurrent capacity of the bus bar when overcurrent is large is effectively solved, and the quick charge time of the battery is shortened.

Description

Battery cell collecting and connecting assembly and lithium battery

Technical Field

The utility model relates to a lithium ion battery, in particular to a battery core acquisition and connection assembly and a lithium battery.

Background

In recent years, the requirement for fast charge time of batteries is increasing, which increases the requirement for the overcurrent capacity of the bus bars. Because the bus bar is in contact with the low-voltage sampling component, the electrical safety problem exists, and the width of the polar cylinder surface of the battery cell is limited, so that the width dimension of the bus bar is limited (when the battery cell used is a battery cell with two polar posts, the width K of the bus bar is smaller than 1/2 of the width A of the battery cell, and when the battery cell used is a battery cell with the same polar post, the width K of the bus bar is smaller than 1/3 of the width A of the battery cell); the overcurrent capacity of the bus bar can not meet the requirement, and particularly when the number of strings of the battery modules is increased, the low-voltage sampling assembly occupies more width dimensions, so that the width of the bus bar is further reduced, and the quick charge time of the battery pack is not facilitated to be shortened.

At present, there are many researches on the overcurrent capability of a bus bar, for example, a chinese patent application No. 201910103200.2, and a patent application document with publication date of 2019, 4 and 16 days disclose a connection structure of a battery post and a bus bar, and a battery module. The connection structure of the battery post and the bus bar comprises the battery post, the bus bar and a conductive piece. The bus bar is welded with the battery pole and forms a welding joint, and the bus bar is electrically connected with the battery pole through the welding joint. The conductive member is located between the battery post and the bus bar, so that the bus bar and the battery post are electrically connected through the conductive member. The busbar and the battery post are electrically connected through the welding joint and the conductive piece, so that the current flow area between the battery post and the busbar is not only the welding joint, but also the conductive piece is included, the current flow area is greatly improved, and the current flow capacity between the battery post and the busbar is greatly improved. However, this scheme only increases the effective area of contact between electric core utmost point post and the busbar, promotes the overcurrent ability between electric core utmost point post and the busbar, can not increase the current-carrying cross section of busbar to can't improve the overcurrent ability of busbar. The overcurrent capacity of the battery pack is determined by the current carrying section of the bus bar, and the quick charge time of the battery pack can be effectively shortened only by increasing the current carrying section of the bus bar.

The patent document of China patent application number 201721685706.1 and application publication date 2018, 6 and 19 discloses a battery busbar and a battery module, wherein the battery busbar comprises a substrate, the substrate comprises a V-shaped bending part, a through groove is formed in the bending part of the V-shaped bending part, the overcurrent area of the battery busbar is increased, and the large current passing capacity of the busbar is improved. However, firstly, the busbar is bent into a V shape, the current carrying section of the busbar cannot be increased, the current carrying section is still unchanged, and the difficulty of the process is increased; and secondly, due to the design of the through groove, the current carrying section of the busbar is greatly reduced, and the quick charge time of the battery pack is shortened.

Disclosure of Invention

1. Problems to be solved

The utility model provides a battery cell collecting and connecting assembly, which aims to solve the problem of insufficient overcurrent capacity of the existing busbar. Further, a lithium battery is provided, and the quick charge capacity of the lithium battery is enhanced.

2. Technical proposal

In order to solve the problems, the utility model adopts the following technical scheme.

The utility model provides a connection subassembly is gathered to electricity core, includes busbar and sampling subassembly, still includes the tray, the tray is the insulating part, and busbar and sampling subassembly are connected respectively to two opposite sides on the tray length direction, and the tray separates busbar and sampling subassembly promptly, and busbar and sampling subassembly pass the tray electricity simultaneously and are connected.

As a possible embodiment of the present utility model, when the cell used is a two-sided outlet post cell: the relation among the width K of the busbar, the pole length L and the width A of the battery cell is as follows: l < K < A;

when the used battery cell is a same-side pole battery cell: the relation among the width K of the busbar, the pole length L and the width A of the battery cell is as follows: l < K < A/2.

As a possible embodiment of the present utility model, the sampling assembly is a low-pressure sampling assembly.

As a possible implementation manner of the utility model, the tray is provided with a plurality of first welding holes, and the busbar and the sampling assembly are electrically connected at the first welding holes.

As a possible implementation manner of the utility model, the tray is provided with a plurality of second welding holes, the second welding holes are positioned below the first welding holes, the bus bars connected with the back surfaces can be seen from the second welding holes, and the bus bars and the battery cells are welded at the second welding holes.

As a possible embodiment of the utility model, the busbar and the sampling assembly are fixed to the tray by riveting or gluing.

As a possible implementation mode of the utility model, when riveting is adopted, a plurality of riveting columns are arranged on the tray, a plurality of riveting holes are formed at the connecting positions of the busbar and/or the sampling component and the tray, the riveting columns are matched and inserted into the riveting holes, and the busbar and/or the sampling component is riveted and fixed on the tray by using a hot riveting technology.

As a possible embodiment of the utility model, the area of the tray to which the busbar and/or the sampling assembly is connected is planar when gluing is used.

As a possible embodiment of the present utility model, the busbar is fixed by riveting, and the sampling assembly is fixed by gluing.

As a possible embodiment of the utility model, at least two rivet holes are provided on the busbar and/or the sampling assembly.

As a possible embodiment of the utility model, the sampling assembly comprises a collecting plate, a nickel plate and an insert, wherein the collecting plate is connected to the tray, the nickel plate is electrically connected to the busbar, for example welded, and the insert is fixed at the end of the collecting plate in the length direction.

As a possible implementation manner of the utility model, the tray is a plastic piece and is formed by adopting an injection molding process.

The battery cell acquisition and connection assembly is used for electrically connecting the battery cell and is fixed in the box body to form the battery.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

according to the battery cell acquisition connection assembly, the sampling assembly is isolated from the bus bar by using the tray, so that projection overlapping of the sampling assembly and the bus bar can be achieved, the bus bar can be widened as much as possible, the overcurrent capacity of the bus bar is increased, and the quick charge time of a battery can be effectively shortened.

Drawings

FIG. 1 is an exploded view of a connection cell of the cell collection connection assembly of the present utility model;

fig. 2 is a schematic diagram of a front structure of a tray in the cell collection connection assembly of the present utility model;

FIG. 3 is a schematic view of the back side structure of the tray in the cell collection connection assembly of the present utility model;

FIG. 4 is a schematic view of the installation of a buss bar in the cell collection connection assembly of the present utility model;

FIG. 5 is a schematic diagram of a sampling assembly in the cell acquisition connection assembly of the present utility model;

FIG. 6 is a schematic diagram of a cell collection connection assembly according to the present utility model;

FIG. 7 is a schematic diagram of dimensions of a two-sided outlet post cell and a bus bar according to the present utility model;

FIG. 8 is a schematic diagram of the dimensions of the same side outlet post cell and bus bar of the present utility model;

in the figure:

1. a tray; 11. a first welding hole; 12. a second welding hole; 13. riveting a column; 14. a first connection region; 15. a second connection region; 2. a busbar; 3. a sampling assembly; 31. a collection plate; 32. nickel flakes; 33. an insert; 4. a battery cell; 5. and riveting the holes.

Detailed Description

The utility model will now be described in detail with reference to the drawings and to specific embodiments.

Examples

The embodiment is a battery cell collection and connection assembly and a lithium battery, as shown in fig. 1, including tray 1, busbar 2 and sampling assembly 3 that connect gradually, wherein tray 1 is the insulating part, for example adopts injection molding's working of plastics, and busbar 2 and sampling assembly 3 are connected respectively to the ascending both sides of tray 1 length direction, separates busbar 2 and sampling assembly 3, realizes that busbar 2 overlaps with the projection of sampling assembly 3, has effectively solved when the overcurrent is great, and busbar 2 overcurrent capacity is not enough problem, increases busbar 2's area of converging, shortens the quick charge time of battery. When the used battery cell is a battery cell with two side pole posts: as shown in fig. 7, the relationship among the width K of the busbar 2, the pole length L, and the width a of the cell is: l < K < A; when the used battery cell is a same-side pole battery cell: as shown in fig. 8, the relationship among the width K of the busbar 2, the pole length L, and the width a of the cell is: l < K < A/2.

Specifically, the tray 1 of the present embodiment includes a front surface and a rear surface:

as shown in fig. 2, which shows the front surface of the tray 1, the upper part of the front surface of the tray 1 is a planar first connection area 14 for gluing the collecting plate 21 of the sampling assembly 3; a plurality of first welding holes 11 are formed in the length direction of the first connecting area 14, and are used for electrically connecting the sampling assembly 3 and the busbar 2 at the first welding holes 11, and welding is usually carried out; fig. 5 is a schematic structural diagram of the sampling assembly 3, which is a low-voltage sampling assembly, and is composed of a collecting plate 31, a nickel plate 32 and an insert 33, wherein the collecting plate 31 is adhered to the first connecting area 14 of the tray 1, the nickel plate 32 is connected to the lower end of the collecting plate 31 and is located at the first welding hole 11 for connecting the busbar 2 on the back, and the insert 33 is installed at one end of the collecting plate 31 in the length direction.

Fig. 3 is a back surface of the tray 1, as shown in fig. 4, and is used for connecting the busbar 2, wherein a second connection area 15 is arranged at an upper portion of the back surface of the tray 1 and is used for connecting the busbar 2, the busbar 2 of the embodiment is riveted on the second connection area 15 by adopting a hot riveting technology, that is, a plurality of riveting columns 13 are distributed on the second connection area 15, the corresponding busbar 2 is provided with the same number of riveting holes 5, and the riveting columns 13 are inserted into the riveting holes 5 in a matched manner to be connected and fixed in a reheating riveting manner; a row of second welding holes 12 are formed in the tray 1 below the first welding holes 11, part of the busbar 2 can be exposed through the second welding holes 12, and an operator welds the busbar 2 with the battery cell 4 at the second welding holes 12.

Fig. 6 is a front view of the battery cell collection connection assembly of the present embodiment after installation.

It should be noted that, the connection manner between the bus bar 2 and the sampling assembly 3 and the tray 1 is not unique, that is, the bus bar 2 may be glued on the tray 1, or may be clamped on the tray 1, and the sampling assembly 3 may be riveted on the tray 1, so long as the fixed connection between the tray 1 and the bus bar 2 and the fixed connection between the sampling assembly 3 and the bus bar 2 can be realized, and those skilled in the art can select the connection manner, which all relate to the inventive concept of the present utility model and belong to the protection scope of the present utility model.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (10)

1. The utility model provides a connection subassembly is gathered to electricity core, includes busbar (2) and sampling subassembly (3), its characterized in that: the device is characterized by further comprising a tray (1), wherein the tray (1) is an insulating piece, two opposite surfaces of the tray (1) in the length direction are respectively connected with the busbar (2) and the sampling assembly (3), and meanwhile the busbar (2) and the sampling assembly (3) penetrate through the tray (1) to be electrically connected.

2. The cell harvesting connection assembly of claim 1, wherein:

when the used battery cell is a battery cell with two side pole posts: the relation among the width K of the busbar (2), the pole length L and the width A of the battery cell is as follows: l < K < A;

when the used battery cell is a same-side pole battery cell: the relation among the width K of the busbar (2), the pole length L and the width A of the battery cell is as follows: l < K < A/2.

3. The cell harvesting connection assembly of claim 1, wherein: a plurality of first welding holes (11) are formed in the tray (1), and the busbar (2) and the sampling assembly (3) are electrically connected at the first welding holes (11).

4. The cell harvesting connection assembly of claim 1, wherein: the tray (1) is provided with a plurality of second welding holes (12) for welding the busbar (2) and the battery cell (4).

5. The cell harvesting connection assembly of claim 1, wherein: the busbar (2) and the sampling assembly (3) are fixed on the tray (1) through riveting or gluing.

6. The cell harvesting connector assembly of claim 5, wherein: be equipped with a plurality of riveting post (13) on tray (1), a plurality of riveting hole (5) are seted up in busbar (2) and/or sampling subassembly (3) and the junction of tray (1), and riveting post (13) cooperation inserts riveting hole (5), uses the hot riveting technique to fix busbar (2) and/or sampling subassembly (3) riveting on tray (1).

7. The cell harvesting connector assembly of claim 6, wherein: at least two riveting holes (5) are formed in the busbar (2) and/or the sampling assembly (3).

8. The cell harvesting connection assembly of claim 1, wherein: the sampling assembly (3) comprises a collection plate (31), a nickel sheet (32) and an insert (33), wherein the collection plate (31) is connected to the tray (1), the nickel sheet (32) is electrically connected with the busbar (2), and the insert (33) is fixed at the end part of the collection plate (31) in the length direction.

9. A cell harvesting connection assembly according to any one of claims 1-8, wherein: the tray (1) is a plastic piece.

10. A lithium battery, characterized in that: the battery cell (4) is electrically connected by the battery cell collecting and connecting assembly according to any one of claims 1 to 9 and is fixed in a box body to form a battery.