Battery cell shell and battery

Abstract

The utility model discloses a battery cell shell. The battery cell shell comprises a bottom plate and side plates, the edge of one side of the side plate is connected with the periphery of the bottom plate, a containing groove is defined by the bottom plate and the side plate, the side plate is provided with a first edge, a second edge is arranged at the joint of the side plate and the bottom plate, the first edge and the second edge are each provided with a first transition fillet, the radius of the first transition fillet is R1, and the radius of the second transition fillet is R2. A second transition fillet is arranged at the intersection of the first edge and the second edge, the radius of the second transition fillet is R2, and R2-R1 is larger than or equal to 1.5 mm and smaller than or equal to 3mm. The accommodating groove can reach a larger depth, and the battery cell shell is not easy to break through and damage in the stamping process, so that the battery cell shell has better use safety and processing yield. The utility model further discloses a battery adopting the battery cell shell.

Description

Technical Field

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

[0002] Some existing lithium batteries include a cell shell, a laminated cell and a cover plate. The cell shell includes a bottom plate and a side plate. The bottom plate and the side plate are combined to form a receiving groove. The laminated cell is received in the receiving groove. The cover plate is connected to the cell shell and seals the notch of the receiving groove. Compared with other materials, steel cell shells have better physical stability and pressure resistance. Steel cell shells usually need to be processed into receiving grooves by stamping. In order to increase the energy density of the battery, the receiving groove can be deepened, but it is easy to cause damage to the cell shell during stamping or insufficient safety in use. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell housing, the depth of the accommodating groove can be greater, and the processing yield and use safety are better.

[0004] The utility model also provides a battery having the battery cell shell.

[0005] According to the embodiment of the first aspect of the utility model, the battery cell housing comprises a bottom plate and a side plate. One side edge of the side plate is connected to the periphery of the bottom plate, the bottom plate and the side plate are enclosed to form a receiving groove, the side plate is provided with a first edge, the junction of the side plate and the bottom plate is provided with a second edge, the first edge and the second edge are both provided with a first transition fillet, the radius of the first transition fillet is R1, the intersection of the first edge and the second edge is provided with a second transition fillet, the radius of the second transition fillet is R2, and 1.5mm≤R2-R1≤3mm is satisfied.

[0006] The battery cell shell according to the embodiment of the first aspect of the utility model has at least the following beneficial effects: during the punching process of the battery cell shell to form the accommodating groove, a first transition fillet is set on both the first edge and the second edge, and a second transition fillet is set at the intersection of the first edge and the second edge. When the radius of the second transition fillet is 1.5 mm to 3 mm larger than the radius of the first transition fillet, the accommodating groove can reach a greater depth, and the battery cell shell is not easily broken and damaged during the punching process, so that the battery cell shell has better safety of use and processing yield.

[0007] According to some embodiments of the present invention, the radius R1 of the first transition fillet is ≤0.7 mm.

[0008] According to some embodiments of the present invention, the bottom plate and the side plates are both steel plates, and the side plates and the bottom plate are an integral piece.

[0009] According to some embodiments of the present invention, the side panel includes at least three plate bodies connected end to end in sequence, and the first edge is provided at the junction of two adjacent plate bodies.

[0010] According to some embodiments of the present utility model, the side plate includes four plate bodies, two adjacent plate bodies are perpendicular to each other, and the accommodating groove is a rectangular groove.

[0011] According to some embodiments of the present invention, the side plate and the bottom plate are perpendicular to each other.

[0012] According to some embodiments of the present invention, the side panels and the bottom panel have the same thickness.

[0013] The battery according to the second embodiment of the utility model comprises a laminated battery cell and the above-mentioned battery cell housing, wherein the laminated battery cell is accommodated in the accommodation groove.

[0014] The battery according to the embodiment of the second aspect of the utility model has at least the following beneficial effects: due to the use of the above-mentioned battery cell shell, the energy density of the battery can be improved.

[0015] According to some embodiments of the present invention, a cover plate is further included, which is connected to a side of the side plate away from the bottom plate, and the cover plate can cover the notch of the accommodating groove. The thickness of the bottom plate and the side plate is L1, and the thickness of the cover plate is L2, satisfying L1-L2≥0.

[0016] According to some embodiments of the present invention, the thickness of the bottom plate, the side plate and the cover plate satisfy: L1-L2≤70 μm.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a three-dimensional schematic diagram of a battery cell housing according to an embodiment of the utility model;

[0020] Figure 2 It is an exploded schematic diagram of a battery cell housing and a cover plate of an embodiment of the utility model;

[0021] Figure 3 For the utility model embodiment Figure 2 Schematic cross-sectional view in the AA direction.

[0022] Reference numerals:

[0023] Bottom plate 100;

[0024] Side plate 200, plate body 210;

[0025] Accommodating tank 300;

[0026] First transition fillet 400;

[0027] Second transition fillet 500;

[0028] Cover plate 600. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Some existing lithium batteries include a cell shell, a laminated cell and a cover plate 600. The cell shell includes a bottom plate 100 and a side plate 200. The bottom plate 100 and the side plate 200 enclose a receiving groove 300. The laminated cell is received in the receiving groove 300. The cover plate 600 is connected to the cell shell and covers the notch of the receiving groove 300. Compared with other materials, a steel cell shell has better physical stability and pressure resistance. The steel cell shell usually needs to be processed into the receiving groove 300 by stamping. In order to improve the energy density of the battery, the receiving groove 300 can be deepened. However, the method of directly deepening the stamping depth during stamping is likely to cause damage to the cell shell during stamping or insufficient safety in use.

[0034] Reference Figures 1 to 3 , is a cell housing of an embodiment of the utility model, comprising a bottom plate 100 and a side plate 200. One side edge of the side plate 200 is connected to the periphery of the bottom plate 100, the bottom plate 100 and the side plate 200 are enclosed to form a receiving groove 300, the side plate 200 is provided with a first edge, the junction of the side plate 200 and the bottom plate 100 is provided with a second edge, the first edge and the second edge are both provided with a first transition fillet 400, the radius of the first transition fillet 400 is R1, the intersection of the first edge and the second edge is provided with a second transition fillet 500, the radius of the second transition fillet 500 is R2, and 1.5mm≤R2-R1≤3mm is satisfied.

[0035] During the punching process of the cell shell to form the receiving groove 300, the first edge and the second edge are both provided with a first transition fillet 400, and the intersection of the first edge and the second edge is provided with a second transition fillet 500. When the radius of the second transition fillet 500 is 1.5mm to 3mm greater than the radius of the first transition fillet 400, the receiving groove 300 can reach a greater depth, and the cell shell is not easily broken and damaged during the punching process, so that the cell shell has better safety in use and processing yield. Specifically, the value of R2-R1 can be 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, etc., or other values ​​within the range, and those skilled in the art can make specific configurations according to actual needs.

[0036] Specifically, the first transition fillet 400 and the second transition fillet 500 are smoothly transitionally connected to each other.

[0037] In an embodiment, the radius R1 of the first transition fillet 400 is ≤0.7 mm, which can minimize the interference between the first transition fillet 400 and the pole piece in the laminated battery cell, so that a larger pole piece can be arranged in the receiving groove 300, which is convenient for assembling the battery cell shell into a battery, can improve the energy density, and also facilitates the stamping process of the receiving groove 300.

[0038] It is understandable that the radius of the first transition fillet 400 can be 0.7mm, 0.6mm, 0.5mm, etc. or other values, as long as it can be stamped and formed, and those skilled in the art can make specific configurations according to actual needs. Since 1.5mm≤R2-R1≤3mm, the radius of the second transition fillet 500 can also be 1.5mm to 3.7mm, such as 1.8mm, 2.0mm, 2.3mm, 2.5mm, 2.8mm, 3.0mm, 3.3mm, 3.5mm, etc., and those skilled in the art can make specific configurations according to actual needs.

[0039] In the embodiment, the bottom plate 100 and the side plate 200 are both steel plates, and the side plate 200 and the bottom plate 100 are an integral part, which is convenient for punching out the accommodating groove 300 by stamping, and the battery cell housing has good physical stability and pressure resistance. It is conceivable that the battery cell housing can also be made of other metal materials, such as aluminum materials and other metal materials suitable for stamping processes.

[0040] In the embodiment, the side plate 200 includes four plate bodies 210 connected end to end in sequence, and a first edge is provided at the joint of two adjacent plate bodies 210. The four plate bodies 210 are connected to form the side plate 200, and form a quadrangular prism-shaped receiving groove 300 with the bottom plate 100, which can be adapted to conventional laminated battery cells and has a relatively simple structure.

[0041] In the embodiment, two adjacent plates 210 are perpendicular to each other, and the receiving groove 300 is a rectangular groove. The pole piece of the laminated battery cell is usually a rectangular sheet, so that the laminated battery cell is usually a rectangular block, and the four side plates 200 and the bottom plate 100 are enclosed to form a rectangular receiving groove 300, which is convenient for accommodating the laminated battery cell in an adaptive manner, and has a simple structure and is easy to implement. It can be understood that for some special shapes of battery cells, for example, the electrode is a triangular sheet, and the stacked battery cell is in the shape of a triangular prism after stacking. At this time, the side panel 200 may include three plate bodies 210, and the side panel 200 and the bottom plate 100 are combined to form a triangular prism-shaped receiving groove 300, which is adapted to the shape of the stacked battery cell; when the electrode is a pentagonal sheet, the stacked battery cell is in the shape of a pentagonal prism after stacking. At this time, the side panel 200 may include five plate bodies 210, and the side panel 200 and the bottom plate 100 are combined to form a pentagonal prism-shaped receiving groove 300, which is adapted to the shape of the stacked battery cell; and by analogy, when the electrode is an N-gonal sheet, the stacked battery cell is in the shape of an N-prism after stacking. At this time, the side panel 200 may include N plate bodies 210, and the side panel 200 and the bottom plate 100 are combined to form an N-prism-shaped receiving groove 300, so as to better adapt to and accommodate the N-prism-shaped stacked battery cells and improve the energy density of the battery. It is conceivable that the side panel 200 may include three, four, five or more panel bodies 210 .

[0042] In the embodiment, the side plate 200 and the bottom plate 100 are perpendicular to each other, which is convenient for fitting conventional laminated cells. It is conceivable that, depending on the shape of the laminated cells, the side plate 200 and the bottom plate 100 can also be arranged at an obtuse angle, in which case the laminated cells can be adapted to place frustum-shaped laminated cells, thereby improving the space utilization of the accommodating groove 300.

[0043] In the embodiment, the side plate 200 and the bottom plate 100 have the same thickness, which can facilitate stamping to form the receiving groove 300, and increase the volume of the receiving groove 300 of the battery cell shell, thereby improving the space utilization and battery energy density. It is conceivable that in some embodiments, the thickness of the side plate 200 and the bottom plate 100 can also be different, for example, the thickness of the bottom plate 100 is slightly greater than the thickness of the side plate 200, or the thickness of the bottom plate 100 is slightly less than the thickness of the side plate 200. Those skilled in the art can make specific configurations according to actual needs.

[0044] Furthermore, the utility model also discloses a battery, including a laminated battery cell and the above-mentioned battery cell shell, and the laminated battery cell is accommodated in a receiving groove 300. Due to the use of the above-mentioned battery cell shell, a larger laminated battery cell can be placed, the energy density of the battery is improved, and the improvement method is relatively simple, which can reduce the investment cost. It is understandable that the above-mentioned battery cell shell can also be applied to a wound battery cell, and those skilled in the art can make specific configurations according to actual needs. Compared with a wound battery cell, a laminated battery cell has more advantages in terms of energy density, safety and cycle life.

[0045] In an embodiment, the battery further includes a cover plate 600, which is connected to a side of the side plate 200 away from the bottom plate 100, and the cover plate 600 can cover the notch of the accommodating groove 300. The thickness of the bottom plate 100 and the side plate 200 are both L1, and the thickness of the cover plate 600 is L2, satisfying L1-L2≥0. The cover plate 600 covers the notch of the accommodating groove 300, and there are laminated cells and electrolyte inside the accommodating groove 300. The cover plate 600 is sealed and connected to the side plate 200 by welding. It is found from experiments that if L1-L2﹤0, the welding of the cell shell and the cover plate 600 is likely to cause deformation of the cell shell, and it is easy to weld through the cell shell, resulting in leakage problems. When L1-L2≥0, the welding of the two is not likely to cause deformation and welding through of the cell shell, thereby improving the energy density of the cell.

[0046] In the embodiment, the thickness of the bottom plate 100 and the side plate 200 and the thickness of the cover plate 600 satisfy: L1-L2≤70μm. When the thickness of the battery cell shell is greater than the thickness of the cover plate 600, the smaller the thickness of the cover plate 600, the smaller the volume of the battery cell, which can improve the energy density of the battery cell. However, if the difference in thickness between the two is large, the cover plate 600 may be prone to defects such as deformation when the battery cell shell and the cover plate 600 are welded. It is found from experiments that when L1-L2≤70μm, the welding of the battery cell shell and the cover plate 600 is relatively firm and stable, and the cover plate 600 is not prone to deformation defects, thereby facilitating the improvement of the energy density of the battery cell.

[0047] Therefore, the thickness of the bottom plate 100 and the side plate 200 are both L1, and the thickness of the cover plate 600 is L2. The thickness relationship between the two is preferably 0≤L1-L2≤70μm. At this time, the battery casing and the cover plate 600 are not prone to defects such as deformation when welded together, and the energy density of the battery cell can be improved to a certain extent. For example, the value of L1-L2 can be 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, etc. or other values. Those skilled in the art can make specific configurations according to actual needs.

[0048] Specifically, the cover plate 600 is made of the same material as the battery housing, and the cover plate 600 is made of a steel plate.

[0049] Specifically, laminated batteries are relatively widely used in mobile phones, laptop computers and electric vehicles.

[0050] Specifically, the laminated battery cell includes a positive electrode sheet and a negative electrode sheet, which are alternately stacked in sequence, and a separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet usually includes a positive electrode current collector and a positive electrode active material layer arranged on both sides of the positive electrode current collector, and the negative electrode sheet usually includes a negative electrode current collector and a negative electrode active material layer arranged on both sides of the negative electrode current collector.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell casing, characterized in that: include: Bottom plate (100); A side plate (200), one side edge of which is connected to the periphery of the bottom plate (100), the bottom plate (100) and the side plate (200) are combined to form a receiving groove (300), the side plate (200) is provided with a first edge, a second edge is provided at the junction of the side plate (200) and the bottom plate (100), the first edge and the second edge are both provided with a first transition fillet (400), the radius of the first transition fillet (400) is R1, a second transition fillet (500) is provided at the intersection of the first edge and the second edge, the radius of the second transition fillet (500) is R2, and 1.5 mm ≤ R2-R1 ≤ 3 mm is satisfied.

2. The battery cell casing according to claim 1, characterized in that: The radius R1 of the first transition fillet (400) is ≤0.7 mm.

3. The battery cell casing according to claim 1, characterized in that: The bottom plate (100) and the side plate (200) are both steel plates, and the side plate (200) and the bottom plate (100) are an integral part.

4. The battery cell casing according to claim 1, characterized in that: The side plate (200) comprises at least three plate bodies (210) connected end to end in sequence, and the first edge is provided at the joint between two adjacent plate bodies (210).

5. The battery cell casing according to claim 4, characterized in that: The side plate (200) comprises four plate bodies (210), two adjacent plate bodies (210) are perpendicular to each other, and the accommodating groove (300) is a rectangular groove.

6. The battery cell casing according to claim 1, characterized in that: The side plate (200) and the bottom plate (100) are perpendicular to each other.

7. The battery cell casing according to claim 1, characterized in that: The side plate (200) and the bottom plate (100) have the same thickness.

8. A battery, characterized in that: include: Laminated battery cells; The battery cell casing according to any one of claims 1 to 7, wherein the laminated battery cell is accommodated in the accommodation groove (300).

9. The battery according to claim 8, characterized in that: The invention also comprises a cover plate (600), wherein the cover plate (600) is connected to a side of the side plate (200) away from the bottom plate (100), and the cover plate (600) is capable of covering the notch of the accommodating groove (300). The thickness of the bottom plate (100) and the side plate (200) are both L1, and the thickness of the cover plate (600) is L2, satisfying L1-L2≥0.

10. The battery according to claim 9, characterized in that: The thickness of the bottom plate (100) and the side plate (200) and the thickness of the cover plate (600) satisfy: L1-L2≤70 μm.

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