Battery cell housing, battery cell, and energy storage device

Abstract

The utility model discloses a kind of electric core shell, electric core and energy storage device, including bottom plate, side plate and support plate;Side plate has the accommodating cavity of two ends opening;Bottom plate is connected to one end of side plate, and the one end opening of accommodating cavity is closed;The one end opening of side plate away from bottom plate is used to make pole core insert accommodating cavity;In the direction away from bottom plate, the inner diameter of accommodating cavity gradually increases;Support plate is connected to the inner side of side plate, and located one end of side plate away from bottom plate, for supporting the cover plate assembly of surface arranged in the side plate away from bottom plate;Support plate is provided with hollow part, so that pole core can be electrically connected cover plate assembly.When pole core is placed in accommodating cavity, the distance between pole core and side plate gradually increases in the direction away from bottom plate (i.e. The direction from bottom plate to side plate), so that when cover plate assembly and side plate are welded on the surface of side plate away from bottom plate, the welding point area can be far away from pole core, so that the damage of pole core due to welding cover plate assembly and the heat radiation of electric core shell can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery safety technology, and in particular to a battery cell casing, a battery cell, and an energy storage device. Background Technology

[0002] Currently, steel-cased button cell typically includes a cell casing, a cover plate assembly, and an electrode core. The cell casing has a receiving cavity, and the receiving cavity forms an opening at the upper end of the cell casing. The cover plate assembly is used to close the upper opening of the receiving cavity. The electrode core is installed inside the cell casing, and its positive and negative tabs are electrically connected to the cell casing and the cover plate assembly, respectively.

[0003] During the laser sealing welding process of the cell casing and cover plate assembly, the welding edge of the cell casing is close to the upper edge of the electrode core (i.e. the edge of the electrode core near the end of the cover plate assembly), making the upper edge of the electrode core susceptible to damage from the heat radiation of the laser welding. Utility Model Content

[0004] This utility model provides a battery cell housing, a battery cell, and an energy storage device, aiming to solve the problem that the edge of the existing electrode core near the cover plate assembly is easily damaged by the heat radiation from laser welding.

[0005] To address the aforementioned problems, this utility model provides a battery cell housing, including a base plate, a side plate, and a support plate. The side plate has a receiving cavity with openings at both ends. The base plate is connected to one end of the side plate and closes one opening of the receiving cavity. The opening at the end of the side plate away from the base plate is used to allow the electrode core to be placed into the receiving cavity. The inner diameter of the receiving cavity gradually increases in the direction away from the base plate. The support plate is connected to the inner side of the side plate and is located at the end of the side plate away from the base plate, for supporting a cover plate assembly disposed on the surface of the side plate away from the base plate. The support plate has a hollow portion, allowing the electrode core in the receiving cavity to be electrically connected to the cover plate assembly.

[0006] Optionally, the inclination angle of the inner surface of the side plate is α, where 1.2°≤α≤3°, and the inner surface of the side plate encloses the receiving cavity.

[0007] Optionally, the outer diameter of the side plate gradually increases along the direction away from the base plate; the base plate is located inside the receiving cavity, and in the axial direction of the receiving cavity, the surface of the base plate away from the receiving cavity and the surface of the side plate near the base plate are flush; the radial distance between the end of the outer side of the side plate near the base plate and the end of the outer side of the side plate away from the base plate is A, where 0.11mm≤A≤0.5mm.

[0008] Optionally, the inner side of the side plate is parallel to the outer side of the side plate, and the thickness of the side plate is B, wherein 0.1mm≤B≤0.2mm.

[0009] Optionally, the support plate is spaced apart from the base plate along the axial direction of the receiving cavity; and / or, the support plate is connected to the inner side of the side plate, and the surface of the support plate facing away from the base plate is flush with the surface of the side plate facing away from the base plate.

[0010] Optionally, in the radial direction of the receiving cavity, the width of the support plate is C, wherein 0.2mm≤C≤0.5mm; and / or, in the axial direction of the receiving cavity, the thickness of the support plate is D, wherein 0.1mm≤D≤0.15mm; and / or, the support plate is an annular structure and surrounds the axis of the receiving cavity, wherein the inner diameter of the support plate is E, wherein 6mm≤E≤14mm.

[0011] To address the aforementioned issues, this utility model also provides a battery cell, comprising an electrode core, a cover plate assembly, and a battery cell housing as described in any one of the above embodiments; the electrode core is installed within the receiving cavity; and the cover plate assembly is connected to the surface of the side plate facing away from the bottom plate.

[0012] Optionally, the pole core does not protrude from the side plate in the direction away from the base plate; the distance between the outer edge of the pole core at the end away from the base plate and the inner side of the side plate at the end away from the base plate is F, 0.5mm≤F≤2mm; and / or, the outer side of the side plate at the end away from the base plate is welded to the cover plate assembly.

[0013] Optionally, in the axial direction of the receiving cavity, the pole core is located between the base plate and the support plate; the support plate has an annular structure, the inner diameter of the support plate is larger than the outer diameter of the pole core, and the difference between the two is G, where 0.2mm≤G≤1mm.

[0014] To address the aforementioned problems, this utility model embodiment also provides an energy storage device, characterized in that it includes the battery cell described in any one of the above-mentioned claims.

[0015] In the battery cell housing, battery cell, and energy storage device provided in this embodiment of the utility model, after the electrode core is placed in the receiving cavity, the distance between the electrode core and the side plate gradually increases along the direction away from the bottom plate (i.e., the direction from the bottom plate to the side plate). In this way, when the cover plate assembly placed on the surface of the side plate away from the bottom plate is welded to the side plate, the welding point area can be far away from the electrode core, thereby effectively avoiding damage to the electrode core due to heat radiation from welding the cover plate assembly and the battery cell housing. The setting of the support plate can make the cover plate assembly more stable on the battery cell housing, thus improving the welding effect between the cover plate assembly and the battery cell housing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the cell housing and electrode core assembly provided in one embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the cell housing and electrode core assembly provided in one embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a cover plate assembly provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of a battery cell provided in one embodiment of the present invention.

[0018] Instruction manual illustrations and reference numerals: 10. Cell casing; 20. Electrode core; 30. Cover plate assembly; 1. Side panel; 11. Receiving cavity; 12. Inner surface; 13. Outer surface; 3. Support plate; 4. Cover plate; 41. Clearance through hole; 5. Pole post; 51. Center post; 52. Flange; 6. Insulating components. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1 and Figure 2 As shown, in one embodiment, the battery cell housing 10 includes a side plate 1, a bottom plate 2, and a support plate 3; the side plate 1 has a receiving cavity 11 with openings at both ends; the bottom plate 2 is connected to one end of the side plate 1 and closes one end opening of the receiving cavity 11; the opening at the end of the side plate 1 away from the bottom plate 2 is used to allow the electrode core 20 to be placed into the receiving cavity 11; the inner diameter of the receiving cavity 11 gradually increases in the direction away from the bottom plate 2; the support plate 3 is connected to the inner side surface 12 of the side plate 1 (i.e., the support plate 3 is located inside the receiving cavity 11) and is located at the end of the side plate 1 away from the bottom plate 2, and the support plate 3 is used to support the cover plate assembly 30 disposed on the surface of the side plate 1 away from the bottom plate 2; the support plate 3 has a hollow portion, so that the electrode core inside the receiving cavity 11 can be electrically connected to the cover plate assembly 30.

[0023] In this embodiment, after the electrode core 20 is placed in the receiving cavity 11, the distance between the electrode core 20 and the side plate 1 gradually increases along the direction away from the bottom plate 2 (i.e., the direction from the bottom plate 2 to the side plate 1). In this way, when the cover plate assembly 30, which is placed on the side plate 1 away from the bottom plate 2 (defined as the first surface), is welded to the side plate 1, the welding point area can be far away from the electrode core 20, thereby effectively avoiding damage to the electrode core 20 due to the heat radiation from the welding cover plate assembly 30 and the cell housing 10.

[0024] The outer edge of the first surface is the welding edge. During laser welding, the laser used for welding is usually irradiated on this edge to weld the side plate 1 to the cover plate assembly 30, thereby completing the laser sealing welding process of the cell housing 10 and the cover plate assembly 30.

[0025] In addition, the support plate 3 can make the cover plate assembly 30 more stable on the cell housing 10, which can improve the welding effect between the cover plate assembly 30 and the cell housing 10.

[0026] In one embodiment, the side plate 1 has an annular structure, and the receiving cavity 11 is formed by the inner side surface 12 of the side plate 1. Alternatively, the cross-section of the side plate 1 can be annular. The receiving cavity 11 can be a conical hole.

[0027] In one embodiment, the base plate 2 is located inside the receiving cavity 11 and is connected to the inner side surface 12; in addition, in the axial direction of the receiving cavity 11, the surface of the base plate 2 facing away from the receiving cavity 11 is flush with the surface of the side plate 1 near the base plate 2.

[0028] in, Figure 1 In the directions shown, the axial direction of the receiving cavity 11 is parallel to the vertical direction.

[0029] like Figure 1 As shown, in one embodiment, the inclination angle of the inner surface 12 of the side plate 1 is α, where 1.2°≤α≤3°. This ensures that the distance between the welding edge of the side plate 1 and the pole core 20 in the receiving cavity 11 is sufficiently large, while avoiding excessive increase in the radial dimension of the side plate 1 (i.e., the radial dimension of the receiving cavity 11).

[0030] Moreover, this design makes it easier to demold and facilitates the fabrication of the cell housing 10.

[0031] It should be noted that the inclination angle of the inner surface 12 can refer to its inclination angle relative to the axis of the receiving cavity 11. When the axis of the receiving cavity 11 is parallel to the vertical direction, the inclination angle of the inner surface 12 is its inclination angle relative to the vertical plane.

[0032] In addition, in actual products, the value of α can be 1.5°, 2°, 2.5° or 3°, etc.

[0033] like Figure 1 As shown, in one embodiment, the outer diameter of the side plate 1 gradually increases along the direction away from the base plate 2. The outer surface 13 of the side plate 1 is also annular, and the diameter of this annularity gradually increases along the direction from the base plate 2 to the side plate 1. This facilitates demolding.

[0034] In addition, the outer surface 13 and inner surface 12 of the side plate 1 refer to the two radially opposite surfaces of the receiving cavity 11.

[0035] Furthermore, the outer edge of the first surface is the edge of the outer side surface 13 that is away from the bottom plate 2.

[0036] In one embodiment, the inclination angle of the outer surface 13 is β, wherein 1.2° ≤ β ≤ 3° The inclination angle of the outer surface 13 can refer to its inclination angle relative to the axis of the receiving cavity 11. When the axis of the receiving cavity 11 is parallel to the vertical direction, the inclination angle of the outer surface 13 is its inclination angle relative to the vertical plane.

[0037] In addition, in actual products, the value of α can be 1.5°, 2°, 2.5° or 3°, etc.

[0038] Furthermore, in one embodiment, the inner side 12 of the side plate 1 is parallel to the outer side 13 of the side plate 1. This facilitates production.

[0039] like Figure 1 As shown, in one embodiment, the radial distance between the outer side surface 13 of the side plate 1 near the bottom plate 2 and the outer side surface 13 of the side plate 1 away from the bottom plate 2 is A, wherein 0.11mm≤A≤0.5mm.

[0040] This avoids the outer diameter of side plate 1 being too large, which is beneficial to improving the energy density of the battery cell.

[0041] like Figure 1 As shown, in one embodiment, the thickness of the side plate 1 is B, where 0.1mm ≤ B ≤ 0.2mm. This ensures the strength of the cell housing 10 while reducing its weight, thus facilitating its processing.

[0042] In actual products, the value of B can be 0.1mm, 0.15mm, 0.18mm or 0.2mm, etc.

[0043] The thickness of the side plate 1 refers to the distance between the inner side surface 12 and the outer side surface 13.

[0044] like Figure 1 As shown, in one embodiment, the support plate 3 and the base plate 2 are spaced apart along the axial direction of the receiving cavity 11.

[0045] like Figure 1 As shown, in one embodiment, the surface of the support plate 3 facing away from the bottom plate 2 and the surface of the side plate 1 facing away from the bottom plate 2 are flush, which is beneficial for production and also facilitates the support of the cover plate assembly 30.

[0046] like Figure 1 As shown, in one embodiment, the width of the support plate 3 in the radial direction of the receiving cavity 11 is C, wherein 0.2mm≤C≤0.5mm. This ensures the support effect on the cover plate assembly 30 and avoids adverse effects on the installation of the pole core 20.

[0047] In actual products, the value of C can be 0.2mm, 0.3mm, 0.4mm, or 0.5mm, etc.

[0048] like Figure 1 As shown, in one embodiment, the thickness of the support plate 3 in the axial direction of the receiving cavity 11 is D, wherein 0.1mm≤D≤0.15mm. This ensures the strength of the support plate 3 while avoiding it occupying too much space in the receiving cavity 11.

[0049] In actual products, the value of D can be 0.1mm, 0.12mm, or 0.15mm, etc.

[0050] In one embodiment, the support plate 3 is an annular structure and surrounds the axis of the receiving cavity 11, which can improve the support effect on the cover plate assembly 30.

[0051] In addition, the inner diameter of the support plate 3 is E, where 6mm ≤ E ≤ 14mm.

[0052] In actual products, the value of E can be 6mm, 8mm, 10mm, 12mm or 14mm, etc.

[0053] In one embodiment, the cell housing 10 can be a one-piece molded structure. Similarly, the side plate 1, the bottom plate 2, and the support plate 3 can also be one-piece molded structures.

[0054] like Figure 3 and Figure 4 As shown, this utility model embodiment also provides a battery cell, which includes an electrode core 20, a cover plate assembly 30, and a battery cell housing 10 as described in any of the above; the electrode core 20 is installed in the receiving cavity 11; the cover plate assembly 30 is connected to the surface of the side plate 1 away from the bottom plate 2.

[0055] like Figure 1 As shown, the electrode core 20 does not protrude from the side plate 1 in the direction away from the base plate 2. This can prevent the electrode core 20 from being damaged.

[0056] like Figure 1 and Figure 2 As shown, the distance between the outer edge of the electrode core 20 away from the base plate 2 and the inner side surface 12 of the side plate 1 away from the base plate 2 is F, where 0.5mm≤F≤2mm. This effectively reduces the adverse effects of heat radiation on the electrode core 20 when welding the cell housing 10 and the cover plate assembly 30.

[0057] In actual products, the value of F can be 0.5mm, 1mm, or 2mm, etc.

[0058] In one embodiment, when the support plate 3 is an annular structure, the inner diameter of the support plate 3 is larger than the outer diameter of the electrode core 20, and the difference between the two is G, where 0.2mm≤G≤1mm. This ensures that the electrode core 20 can be smoothly placed into the receiving cavity 11 while also providing the energy density of the battery cell.

[0059] In actual products, the value of G can be 0.2mm, 0.3mm, 0.5mm or 1mm, etc.

[0060] The “inner diameter of support plate 3” mentioned here refers to the inner diameter of the hollow part of the support plate 3.

[0061] In one embodiment, the electrode core 20 is a wound core. Here, the "outer edge of the electrode core 20 away from the base plate 2" mainly refers to the outer edge of the end near the cover plate assembly 30 in the wound structure formed by stacking and winding the positive electrode sheet, negative electrode sheet and separator.

[0062] In addition, the electrode core 20 also has a positive electrode tab and a negative electrode tab. The positive electrode tab is electrically connected to the positive electrode plate and the cover plate assembly 30, and the negative electrode tab is electrically connected to the negative electrode plate and the cell housing 10. The positive electrode tab passes through the hollow part of the support plate 3 to electrically connect to the cover plate assembly 30.

[0063] like Figure 3 As shown, the cover plate assembly 30 includes a cover plate 4, a pole post 5, and an insulating member 6. The cover plate 4 has a clearance through hole 41. The pole post 5 is connected to the cover plate 4 and insulated from the cover plate 4 by the insulating member 6. The pole post 5 includes a central post 51 and a flange 52 surrounding the outside of the central post 51. The pole post 5 passes through the clearance through hole 41, and the flange 52 is connected to the cover plate 4 by the insulating member 6.

[0064] Among them, the insulating component 6 can be insulating adhesive, which bonds the flange 52 and the cover plate 4 together.

[0065] In addition, the side plate 1, bottom plate 2, support plate 3, cover plate 4, and pole post 5 can all be metal parts.

[0066] The welding of cover plate assembly 30 to side plate 1 mainly refers to the welding of cover plate 4 to side plate 1.

[0067] The cover plate assembly 30 is electrically connected to the positive electrode ear, which mainly refers to the connection between the electrode post 5 and the positive electrode ear.

[0068] "The pole core 20 does not protrude from the side plate 1 in the direction away from the base plate 2" can mean that the winding structure does not protrude from the side plate 1 in the direction away from the base plate 2.

[0069] "In the axial direction of the receiving cavity 11, the pole core 20 is located between the base plate 2 and the support plate 3" can mean that in the axial direction of the receiving cavity 11, the winding structure is located between the base plate 2 and the support plate 3.

[0070] This utility model embodiment also provides an energy storage device, which includes the battery cell described in any of the above-described embodiments.

[0071] The energy storage device can be a Bluetooth headset, a car, or an aircraft, among other things. When in use, the battery cell stores electrical energy to power other devices.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A battery cell housing, characterized in that, Includes the base plate, side plates, and support plates; The side plate has receiving cavities with openings at both ends; The bottom plate is connected to one end of the side plate and closes one end opening of the receiving cavity; The side plate has an opening at the end opposite to the bottom plate for inserting the electrode core into the receiving cavity; The inner diameter of the receiving cavity gradually increases in the direction away from the base plate; The support plate is connected to the inner side of the side plate and is located at one end of the side plate away from the bottom plate, for supporting the cover plate assembly disposed on the surface of the side plate away from the bottom plate; The support plate has a hollow portion, which allows the core of the receiving cavity to be electrically connected to the cover plate assembly.

2. The cell housing according to claim 1, characterized in that, The inclination angle of the inner side surface of the side plate is α, where 1.2°≤α≤3°, and the inner side surface of the side plate encloses and forms the receiving cavity.

3. The cell housing according to claim 2, characterized in that, The outer diameter of the side plate gradually increases in the direction away from the base plate; The base plate is located inside the receiving cavity, and in the axial direction of the receiving cavity, the surface of the base plate opposite to the receiving cavity and the surface of the side plate close to the base plate are flush. The radial distance between the outer side of the side plate near the bottom plate and the outer side of the side plate away from the bottom plate is A, where 0.11mm≤A≤0.5mm.

4. The cell housing according to claim 1, characterized in that, The inner side of the side plate is parallel to the outer side of the side plate, and the thickness of the side plate is B, wherein 0.1mm≤B≤0.2mm.

5. The cell housing according to claim 1, characterized in that, Along the axial direction of the receiving cavity, the support plate is spaced apart from the base plate; and / or, The surface of the support plate facing away from the base plate and the surface of the side plate facing away from the base plate are flush.

6. The cell housing according to claim 1, characterized in that, In the radial direction of the receiving cavity, the width of the support plate is C, where 0.2mm ≤ C ≤ 0.5mm; and / or, Along the axial direction of the receiving cavity, the thickness of the support plate is D, where 0.1 mm ≤ D ≤ 0.15 mm; and / or, The support plate has a ring structure and surrounds the axis of the receiving cavity. The inner diameter of the support plate is E, where 6mm≤E≤14mm.

7. A battery cell, characterized in that, Includes the electrode core, cover plate assembly, and cell housing as described in any one of claims 1 to 6; The electrode core is installed inside the receiving cavity; The cover plate assembly is connected to the side plate on the surface opposite to the base plate.

8. The battery cell according to claim 7, characterized in that, Along the direction away from the base plate, the pole core does not protrude from the side plate; the distance between the outer edge of the end of the pole core facing away from the base plate and the inner side surface of the side plate facing away from the base plate is F, 0.5mm≤F≤2mm; and / or, The outer side of the side plate, away from the bottom plate, is welded to the cover plate assembly.

9. The battery cell according to claim 7, characterized in that, In the axial direction of the receiving cavity, the pole core is located between the base plate and the support plate; The support plate has a ring structure, and the inner diameter of the support plate is larger than the outer diameter of the pole core, and the difference between the two is G, where 0.2mm≤G≤1mm.

10. An energy storage device, characterized in that, Includes the battery cell described in any one of claims 7 to 9.

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