Square battery

Abstract

The utility model discloses a square battery and relates to the technical field of batteries. Comprising a shell, an end cover and a battery cell set, the battery cell set is installed in the shell, the end cover is arranged at an opening of the shell, a pole is arranged on the upper surface of the end cover, and an adapter plate connected to the pole is arranged on the lower surface of the end cover; the battery cell group comprises at least one battery cell, a positive tab bundle formed by combining positive tabs of the at least one battery cell and a negative tab bundle formed by combining negative tabs of the at least one battery cell, and the connecting ends of the positive tab bundle and the negative tab bundle are bent in the horizontal direction; and the positive tab bundle and the negative tab bundle are connected with the corresponding adapter sheets on the end cover through the horizontal connecting ends. According to the square battery disclosed by the utility model, the battery cell can be correspondingly welded and connected with the corresponding pole column through the horizontal connecting end, so that the height of the pole column is effectively controlled, the distance between the end cover and the battery cell is controlled, and the space utilization rate and the energy density of the battery are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a square battery. Background Art

[0002] In order to increase the battery capacity, a square battery is usually composed of multiple cells. Specifically, when manufacturing square batteries, technicians usually stack multiple cells along the thickness direction, weld the corresponding tabs of the stacked multiple cells into a strand, and then connect the stranded tabs to the corresponding poles of the battery end cap.

[0003] In this regard, the Chinese utility model patent with publication number CN217114714U discloses a battery, including: a shell having an opening; a battery cell disposed in the shell, the battery cell including a pole ear; an end cover disposed at the opening of the shell and forming a storage space with the shell; a pole column disposed on the shell and / or the end cover, the pole column being a hollow structure, the pole column being provided with a through-hole, the through-hole connecting the internal space of the pole column with the storage space, wherein the pole ear extends into the pole column through the through-hole and is connected to the pole column. When multiple battery cells are disposed in the shell, the pole ears of multiple battery cells can be simultaneously extended into the pole column through the through-hole, and multiple pole ears can be fixed to the pole column, so there is no need to set the connecting piece structure in the traditional process, which simplifies the welding process and is conducive to quality control.

[0004] Since the utility model adopts a structure in which the pole ear is inserted vertically upward into the pole, the pole at the upper end of the square battery is too protruding, causing the pole part of the battery to occupy excessive installation space during installation and use, and the actual battery cell part becomes smaller, which will ultimately reduce the battery's space utilization and battery energy density. Utility Model Content

[0005] The utility model provides a square battery, by combining the positive pole ears or negative pole ears of a plurality of battery cells into one and bending them to form a horizontal connection end, the battery cells can be welded and connected to the corresponding poles through the horizontal connection ends, so as to effectively control the height of the poles and the distance between the end cover and the battery cell, thereby improving the battery space utilization and the battery energy density, so as to solve the above-mentioned technical problems.

[0006] The utility model provides a technical solution to the above-mentioned problem: providing a square battery, comprising a shell, an end cover, and a battery cell group, wherein the battery cell group is installed in the shell, the end cover is arranged at the opening of the shell, the upper surface of the end cover is provided with a pole, the lower surface of the end cover is provided with a converter connected to the pole, the battery cell group comprises at least one battery cell, a positive pole ear bundle formed by combining the positive pole ears of at least one battery cell, and a negative pole ear bundle formed by combining the negative pole ears of at least one battery cell, the connecting ends of the positive pole ear bundle and the negative pole ear bundle are both bent in the horizontal direction, and the positive pole ear bundle and the negative pole ear bundle are both connected to the corresponding converter on the end cover through the horizontal connecting ends.

[0007] Furthermore, the roots of the connection ends of the negative electrode tab bundle and the positive electrode tab bundle are both located in the middle of the end surface of the battery cell group.

[0008] Furthermore, the adapter is integrally connected to the corresponding pole, and the adapter is arranged on one side of the root of the connection end of the positive electrode tab bundle or the negative electrode tab bundle.

[0009] Furthermore, it also includes a liquid injection hole opened on the end cover.

[0010] Furthermore, it also includes an explosion-proof valve arranged on the end cover.

[0011] Furthermore, the explosion-proof valve and the adapter are respectively located at two sides of the root of the connection end of the positive electrode ear bundle or the negative electrode ear bundle.

[0012] Furthermore, an insulating isolation layer is provided on the lower surface of the end cover, the insulating isolation layer is provided between the adapter and the end cover, and the insulating isolation layer is provided with through holes corresponding to the positions where the adapter and the corresponding pole are connected inside and outside.

[0013] Furthermore, a first welding area is provided at the root position of the connection end of the electrode lug of the at least one battery cell, and the positive electrode lug or the negative electrode lug of the at least one battery cell is correspondingly welded together through the first welding area.

[0014] Furthermore, a second welding area is provided on the connection ends of the positive electrode tab bundle and the negative electrode tab bundle, and the positive electrode tab bundle and the negative electrode tab bundle are both connected to the corresponding adapter sheet by welding through the second welding area.

[0015] Beneficial effects of the utility model:

[0016] The utility model discloses a square battery, which is obtained by welding corresponding positive pole ears and negative pole ears of a plurality of battery cells constituting a battery cell group into a bundle, and bending the connecting ends of the positive pole ear bundle and the negative pole ear bundle after the bundle is respectively connected to the adapter sheet into a horizontal position, so as to further reduce the internal space of the battery occupied by the ears, so that the physical volume of the battery cell can be further increased, thereby improving the internal space utilization rate of the battery and the battery energy density.

[0017] Moreover, the utility model further bundles the pole tabs at the middle position of the end surface of the battery cell group, so that the portion below the root of the connecting end of the corresponding pole tab bundle is distributed in half on both sides of the middle of the end surface of the battery cell group, thereby reducing the thickness of the portion below the root of the connecting end of the pole tab bundle at the bundled position to half of the original thickness, so as to further reduce the gap between the end cover and the upper end surface of the battery cell group, thereby improving the internal space utilization of the battery and the battery energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated into the specification and constitute a part of the specification, illustrate embodiments of the utility model and are used together with the description to explain the principles of the utility model. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the utility model, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 is a schematic cross-sectional view of the overall structure of the square battery of this embodiment;

[0020] Figure 2 is a schematic diagram of the top surface structure of the end cover of this embodiment;

[0021] Figure 3 is a schematic diagram of the lower surface structure of the end cover of this embodiment;

[0022] Figure 4 is a schematic structural diagram of a battery cell group of this embodiment;

[0023] Figure 5 is a schematic structural diagram of the battery cell group of this embodiment when its tab bundle is not bent in the front view direction;

[0024] 1-shell, 2-end cover, 3-cell group, 4-pole, 5-adapter, 6-positive ear bundle, 7-negative ear bundle, 9-liquid injection hole, 10-explosion-proof valve, 11-insulating isolation layer, 12-first welding area, 13-second welding area. DETAILED DESCRIPTION

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0026] See also Figures 1 to 5A square battery according to a specific embodiment of the utility model comprises a shell 1, an end cover 2, and a battery cell group 3. The battery cell group 3 is installed in the shell 1. The end cover 2 is sealed and covered at the upper end opening of the shell 1. The upper surface of the end cover 2 is provided with a positive electrode column and a negative electrode column. Neither the positive electrode column nor the negative electrode column protrudes from the upper surface of the end cover 2. The lower surface of the end cover 2 is provided with a horizontally extending adapter sheet 5, and the positive electrode column and the negative electrode column are each integrally connected to an adapter sheet 5; the battery cell group 3 comprises two battery cells, a positive electrode ear bundle 6 formed by combining the positive electrode ears of the two battery cells, and a negative electrode ear bundle formed by combining the negative electrode ears of the two battery cells. The negative electrode ear bundle 7, the negative electrode ear bundle 7 and the positive electrode ear bundle 6 are all arranged at the upper end surface of the battery cell group 3, and the connecting ends of the positive electrode ear bundle 6 and the negative electrode ear bundle 7 are bent in the horizontal direction; moreover, the positive electrode ear bundle 6 is welded and connected to the corresponding adapter plate 5 through the upper surface of its horizontally bent connecting end, and the negative electrode ear bundle 7 is also welded and connected to the corresponding adapter plate 5 through the upper surface of its horizontally bent connecting end, so as to further reduce the volume of the space between the upper end surface of the battery cell group 3 and the lower surface of the end cover 2, thereby contributing to the improvement of the overall energy density and space utilization of the battery.

[0027] Moreover, the battery cell group 3 can further improve the charging and discharging power of the battery by connecting the side surfaces of the tab bundle to the corresponding pole 4 .

[0028] In other embodiments, the number of battery cells in the battery cell group 3 may be one, three or more.

[0029] Further, the roots of the connection ends of the negative electrode ear bundle 7 and the positive electrode ear bundle 6 are both arranged in the middle of the end surface of the battery cell group 3; specifically, taking the battery cell group 3 composed of two battery cell groups 3 as an example, the two battery cells are stacked in the shell 1 along the thickness direction in this embodiment, and the positive electrode ears of the two battery cell groups 3 are bundled at the middle position of the thickness direction of the entire battery to form a positive electrode ear bundle 6, and the positive electrode ear bundle 6 is then bent in the horizontal direction at the bundle position to facilitate connection with the adapter 5; and, since the electrode ears of the two battery cells are bundled at the middle position of the battery, the electrode ear thicknesses on both sides of the bundle position of the battery are consistent, and compared with the traditional practice of uniformly bundling the positive electrode ears of multiple battery cells on one side of the battery, the protrusion thickness of the positive electrode ear bundle 6 at the upper end surface of the battery cell group 3 in this embodiment is only half of that of the traditional practice, which can also further reduce the space between the end cover 2 and the battery cell group 3. The formation process and structural morphology of the negative electrode ear bundle 7 are consistent with those of the positive electrode ear bundle 6.

[0030] In this embodiment, a liquid injection hole 9 and an explosion-proof valve 10 are also provided on the end cover 2, wherein the explosion-proof valve 10 is relatively large in size. To make the end cover 2 structurally reasonable and easy to install, the connection end of the adapter 5 corresponding to the pole lug bundle and the explosion-proof valve 10 are respectively located on both sides of the entire battery; at the same time, to ensure that there is a sufficiently large welding contact area between the adapter 5 and the corresponding pole lug bundle, the adapter 5 is also all located on the root side of the connection end of the corresponding positive pole lug bundle 6 or negative pole lug bundle 7, so as to ensure that the connection end of the bent pole lug bundle can be in full contact with the corresponding connection end of the corresponding adapter 5.

[0031] In this embodiment, in order to ensure that the tabs of the two battery cells are stably welded together to form the corresponding positive tab bundle 6 and negative tab bundle 7, a first welding area 12 is provided on the side of the positive tab of each battery cell, and a first welding area 12 is also provided on the side of the negative tab; and in order to enable the positive tab bundle 6 and the negative tab bundle 7 of the battery cell group 3 to be stably welded and connected to the corresponding adapter 5, a second welding area 13 is provided on the side of the positive tab of each battery cell, and a second welding area 13 is also provided on the side of the negative tab.

[0032] In addition, to prevent leakage, an insulating isolation layer 11 is also provided on the lower surface of the end cover 2. The insulating isolation layer 11 is a plastic part, and the insulating isolation layer 11 is isolated and arranged between the adapter 5 and the end cover 2. At the same time, the insulating isolation layer 11 is provided with a through hole corresponding to the position where the adapter 5 and the corresponding pole 4 are connected inside and outside. The adapter 5 and the corresponding pole 4 are integrally connected at the hole to ensure circuit connectivity and prevent battery leakage.

[0033] Anything not mentioned above is applicable to the prior art.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A square battery, characterized in that: The battery cell group (3) comprises a shell (1), an end cover (2), and a battery cell group (3). The battery cell group (3) is installed in the shell (1). The end cover (2) is arranged at the opening of the shell (1). The upper surface of the end cover (2) is provided with a pole (4). The lower surface of the end cover (2) is provided with an adapter plate (5) connected to the pole (4). The battery cell group (3) comprises at least one battery cell, a positive pole ear bundle (6) formed by bundling the positive pole ears of at least one battery cell, and a negative pole ear bundle (7) formed by bundling the negative pole ears of at least one battery cell. The connection ends of the positive pole ear bundle (6) and the negative pole ear bundle (7) are both bent in a horizontal direction, and the positive pole ear bundle (6) and the negative pole ear bundle (7) are both connected to the corresponding adapter plate (5) on the end cover (2) through the horizontal connection ends.

2. A square battery as claimed in claim 1, characterized in that: The roots of the connection ends of the negative electrode tab bundle (7) and the positive electrode tab bundle (6) are both located in the middle of the end surface of the battery cell group (3).

3. A square battery as claimed in claim 1, characterized in that: The adapter plate (5) is integrally connected to the corresponding pole (4), and the adapter plate (5) is arranged on one side of the root of the connection end of the positive pole lug bundle (6) or the negative pole lug bundle (7).

4. A square battery as claimed in claim 1, characterized in that: It also includes a liquid injection hole (9) formed on the end cover (2).

5. A square battery as claimed in claim 3, characterized in that: It also includes an explosion-proof valve (10) arranged on the end cover (2).

6. A square battery as claimed in claim 5, characterized in that: The explosion-proof valve (10) and the adapter plate (5) are respectively located at two sides of the root of the connection end of the positive electrode lug bundle (6) or the negative electrode lug bundle (7).

7. A square battery as claimed in claim 1, characterized in that: The lower surface of the end cover (2) is also provided with an insulating isolation layer (11), the insulating isolation layer (11) is provided between the adapter plate (5) and the end cover (2), and the insulating isolation layer (11) is provided with a through hole corresponding to the position where the adapter plate (5) and the corresponding pole (4) are connected inside and outside.

8. A square battery as claimed in claim 1, characterized in that: A first welding area (12) is also provided at the root position of the connection end of the pole ear of the at least one battery cell, and the positive pole ear or the negative pole ear of the at least one battery cell is correspondingly welded together through the first welding area (12).

9. A square battery as claimed in claim 1 or 8, characterized in that: A second welding area (13) is also provided on the connection ends of the positive electrode tab bundle (6) and the negative electrode tab bundle (7), and the positive electrode tab bundle (6) and the negative electrode tab bundle (7) are both welded and connected to the corresponding adapter sheet (5) via the second welding area (13).

Images