Battery cell aluminum shell structure, square shell battery cell and battery module

Abstract

The utility model relates to the technical field of power batteries, and provides a battery cell aluminum shell structure, a square shell battery cell and a battery module, the battery cell aluminum shell structure comprises four side coamings and end plates, the four side coamings are fixed pairwise to form a cuboid shell with two open sides; the end plates are arranged in a square shape. According to the battery cell aluminum shell structure, the square shell battery cell and the battery module, the end plate and one of the four side coamings are integrally formed and bent to form a single-side R angle, the situation that multiple R angles are formed, and multiple interference of a core package is caused can be avoided, meanwhile, compared with punch forming in the prior art, the bending efficiency is greatly improved, and the bending cost is reduced. The angle of the formed R angle can be effectively regulated and controlled, the single-side R angle does not interfere with the core package when being smaller than a certain radius, and compared with the prior art, on the premise that the R angle does not affect the core package assembly and the energy density is improved, the production efficiency of the shell is improved, and the production cost is effectively controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery core aluminum shell structure, a square shell battery core and a battery module. Background Art

[0002] Power batteries are widely used in electric vehicles and energy storage systems and are an important core of electrification. Its basic building blocks include battery cells, battery modules and battery packs. Square shell battery cells are a common type of battery cell with high energy density and good structural stability, suitable for high-demand electric vehicle applications. Multiple battery cells are connected in series and parallel to form a battery module. Each module contains connecting plates, sensors and cooling devices to ensure the reliable operation of the battery cells. Multiple battery modules are further combined into battery packs, which contain battery management systems (BMS) and cooling systems to provide overall monitoring and management functions to ensure the safety and performance of the battery. The design and manufacture of power battery packs need to comprehensively consider battery performance, heat dissipation and safety to meet the needs of different application scenarios.

[0003] For square shell battery cells, the core package needs to be installed in a cubic stamped shell, which will result in an R angle of 3-4mm between the two adjacent side surfaces of the inner wall of the shell. In order to eliminate the interference and extrusion effect of the R angle on the built-in core package, a pad needs to be set in the square shell. The setting of the pad reduces the energy density of the battery cell and increases the consumables of the battery cell production.

[0004] As for this problem, in the prior art, a battery housing and laminated battery with publication number CN109103358A discloses a solution of eliminating the R angle by welding the bottom plate shell square tube to avoid the formation of the R angle affecting the energy density of the battery cell. However, this solution first requires bending the plate three times and welding the seams to form the shell square tube, then welding the bottom plate to the shell square tube, and finally installing the end cover with the pole, which increases the production steps of the square shell, which is not conducive to improving the production efficiency of the battery cell square shell and controlling the cost. Utility Model Content

[0005] In view of this, the utility model proposes a battery core aluminum shell structure, a square shell battery core and a battery module, by integrally forming the end plate and one of the four side panels, and forming a single-sided R angle by bending, it can avoid forming multiple R angles and causing multiple interferences of the core package. At the same time, compared with the stamping forming in the prior art, the angle of the R angle formed by bending can be effectively controlled, and the single-sided R angle will not interfere with the core package when it is less than a certain radius. Compared with the prior art, this setting can make the R angle not affect the core package assembly, improve the production efficiency of the shell while improving the energy density, and effectively control the production cost.

[0006] The technical solution of the utility model is achieved in this way:

[0007] On the one hand, the utility model provides a battery core aluminum shell structure, including four side panels and an end panel, wherein:

[0008] The four side panels are fixed in pairs to form a rectangular shell with openings on both sides;

[0009] The end plate is square in shape and is integrally formed with one of the four side panels. The end plate and the integrally formed side panel are perpendicular to each other, and an R angle is formed at the connection between the end plate and the integrally formed side panel. The other three side panels are non-integrally connected to the end plate to seal a side opening of the rectangular shell.

[0010] On the basis of the above technical solution, preferably, the radius of the R angle is 0.2-2 mm.

[0011] On the basis of the above technical solution, preferably, the three side panels that are not integrally formed with the end panel form a C-shape, and the three side panels are integrally formed.

[0012] On the basis of the above technical solution, preferably, the number of the end plates is two, and they are symmetrically arranged on two opening sides of the rectangular shell to seal the interior of the rectangular shell.

[0013] Further preferably, the two end panels are integrally formed with the same side panel.

[0014] On the basis of the above technical solution, preferably, the side panels integrally formed with the end plates are fixed to the side panels on the other two sides by welding.

[0015] On the basis of the above technical solution, preferably, the end plate is fixed to the three non-integrally formed side panels by welding.

[0016] On the other hand, the utility model provides a square shell battery cell, comprising the above-mentioned battery cell aluminum shell structure.

[0017] On the other hand, the utility model provides a battery module, including the above-mentioned square shell battery cell.

[0018] The battery core aluminum shell structure, square shell battery core and battery module of the utility model have the following beneficial effects compared with the prior art:

[0019] (1) By integrally forming the end plate with one of the four side panels and forming a single-sided R angle by bending, it is possible to avoid forming multiple R angles and causing interference of the core package at multiple locations. At the same time, compared with the stamping in the prior art, the angle of the R angle formed by bending can be effectively controlled, and the single-sided R angle will not interfere with the core package when it is less than a certain radius. Compared with the prior art, this setting can make the R angle not affect the assembly of the core package, improve the production efficiency of the shell while improving the energy density, and effectively control the production cost;

[0020] (2) The three side panels are integrally formed, and the two end panels are integrally formed with the other side panels, so that the welding length can be effectively reduced. At the same time, one of the two end panels can be used as the end cover of the battery cell. The poles and other components are preset on the end plate and then combined, so there is no need to separately form the end cover, which further saves production steps and reduces the length of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a three-dimensional diagram of the aluminum shell structure of the battery core of the utility model;

[0023] Figure 2 This is a partial structural cross-sectional view of the aluminum shell structure of the battery core of the utility model;

[0024] Figure 3 It is a three-dimensional diagram of the square shell battery cell of the present utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-2 As shown, the battery cell aluminum shell structure of the utility model is a rectangular aluminum shell as a whole, which is used as an outer protective shell of the square shell battery cell. The core package and other components are assembled to the aluminum shell to protect the core package and electrolyte arranged inside. Specifically, it includes four side panels 1 and an end plate 2.

[0027] The four side panels 1 are fixed in pairs to form a rectangular shell with openings on both sides, and the two sides of the opening serve as the bottom of the square shell battery cell and the pole mounting end of the square shell battery cell respectively. The four side panels 1 can be selected as an integrated aluminum plate that is enclosed by three bendings and formed by welding gaps. The four bent parts all correspond to the bending parts of the core package after winding, so the R angle 101 formed therein does not interfere with the core package, but the R angle 101 formed by bending can be smaller than the R angle 101 formed by stamping, which is more conducive to increasing the internal space of the battery cell and accommodating more electrolyte. Accommodating more electrolyte can extend the electrolyte replenishment cycle to a certain extent.

[0028] The end panel 2 is square in shape and is integrally formed with one of the four side panels 1. The end panel 2 and the integrally formed side panel 1 are perpendicular to each other, and an R angle 101 is formed at the connection between the end panel 2 and the integrally formed side panel 1. The other three side panels 1 are non-integrally connected to the end panel 2 to seal one side opening of the rectangular shell.

[0029] The length and width of the end plate 2 are adapted to the size of the opening formed by the four side panels 1. The end plate 2 is integrally formed with one of the side panels 1, so that the end plate 3 is bent to close the opening on one side. Accordingly, the radius of the R angle 101 can be effectively controlled by the bending method, thereby effectively reducing or even eliminating the interference of the R angle 101 on the core package, so that there is no need to install components such as pads, or the thickness of the pads can be effectively reduced. At the same time, in terms of production and manufacturing, compared with welding the bottom plate to the outer shell square tube, the molding process is simpler and has fewer steps, which can effectively improve the production efficiency of the aluminum shell and reduce the production cost. Correspondingly, the reduction in welding processes also saves more production consumables.

[0030] In this embodiment, the radius of the R angle 101 is 0.2-2mm. The radius of the R angle 101 is related to the thickness of the aluminum material, the mold equipment used, etc. In the prior art, the radius of the R angle 101 formed by stamping is 3-4mm, and a pad with a thickness of 1-3mm needs to be set on both sides of the R angle 101. After the radius of the R angle 101 is set to 0.2-2mm, the thickness of the pad can be effectively reduced, and even the installation of the pad can be cancelled, thereby reducing production consumables. For an R angle 101 less than 0.8mm, the installation of the pad can be directly cancelled, thereby saving the installation process.

[0031] As a preferred embodiment, the three side panels 1 that are not integrally formed with the end plate 2 form a C-shape, and the three side panels 1 are integrally formed. This arrangement allows the three side panels 1 to be obtained by bending a whole plate without welding. In addition, the four side panels 1 can also be selected to be formed by bending an aluminum plate three times. Although this arrangement further saves the welding process, during the last bending, the previous bent part will interfere with it, increasing the error, which is not conducive to the overall assembly and quality control of the battery cell.

[0032] As a preferred embodiment, the number of the end plates 2 is two, and they are symmetrically arranged on the two opening sides of the rectangular shell to seal the interior of the rectangular shell. The two end plates 2 are integrally formed with the same side panel 1, that is, the three side panels 1 are integrally formed to form a C shape by bending, and the two end plates 2 are integrally formed with one side panel 1. The square shell is composed of a total of six faces, and the square shell can be formed by bending and combining two plates. One of the two end plates 2 can be used as a battery cell bottom plate, and the other can be used as a battery cell end cover. During the assembly process, the poles and other components can be preset on the end plate 2 serving as the battery cell end cover, and then combined, so that there is no need to separately form the end cover, which further saves production steps and reduces the length of the production line.

[0033] In this embodiment, the side panel 1 integrally formed with the end panel 2 is fixed to the side panels 1 on the other two sides by welding, and the three sides of the end panel 2 are fixed to the three non-integrally formed side panels 1 by welding.

[0034] like Figure 3 As shown, the square shell battery cell of the utility model includes the above-mentioned battery cell aluminum shell structure. A core package is arranged in the battery cell aluminum shell to avoid the formed R corner 101 interfering with the installation and use of the core package. The pad-free arrangement can effectively improve the energy density of the core package and save production steps, thereby shortening the production line and reducing corresponding costs.

[0035] It should be noted that a liquid injection port is provided on the end cover of the square shell battery cell, that is, on one side end plate 2. After the cell pack is assembled into the square shell, the electrolyte can be injected through the liquid injection port.

[0036] The battery module of the utility model comprises the square shell battery cells mentioned above, which are arranged by the square shell battery cells and fixed by cable ties. Compared with the battery module in the prior art, the energy density is improved and the battery module has good stability.

[0037] The battery pack formed by combining multiple battery modules can supply more electricity to the vehicle within the same volume, which can have a positive impact on the vehicle's endurance.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery core aluminum shell structure, characterized in that: It comprises four side panels (1) and an end panel (2), wherein: The four side panels (1) are fixed in pairs to form a rectangular outer shell with openings on both sides; The end plate (2) is arranged in a square shape and is integrally formed with one of the four side panels (1); the end plate (2) and the integrally formed side panel (1) are perpendicular to each other, and a R angle (101) is formed at the connection between the end plate (2) and the integrally formed side panel (1); the other three side panels (1) are all non-integrally connected to the end plate (2) to seal a side opening of the rectangular shell.

2. The battery core aluminum shell structure according to claim 1, characterized in that: The radius of the R angle (101) is 0.2-2 mm.

3. The battery core aluminum shell structure according to claim 1, characterized in that: The three side panels (1) that are not integrally formed with the end panel (2) form a C-shape, and the three side panels (1) are integrally formed.

4. The battery core aluminum shell structure according to claim 1, characterized in that: The number of the end plates (2) is two, and they are symmetrically arranged on the two opening sides of the rectangular parallelepiped shell to seal the interior of the rectangular parallelepiped shell.

5. The battery core aluminum shell structure according to claim 4, characterized in that: The two end panels (2) are integrally formed with the same side panel (1).

6. The battery core aluminum shell structure according to claim 1, characterized in that: The side panels (1) formed integrally with the end panels (2) are fixed to the side panels (1) on the other two sides by welding.

7. The battery core aluminum shell structure according to claim 1, characterized in that: The end plate (2) is fixedly welded to the three non-integrally formed side panels (1).

8. A square shell battery cell, characterized in that: A battery core aluminum shell structure comprising any one of claims 1-7.

9. A battery module, characterized in that: The invention comprises the square shell battery cell as described in claim 8.

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