Battery cell housing assembly, battery cell, battery pack, and electric device

Abstract

The utility model discloses a kind of shell assembly of battery monomer, battery monomer, battery pack and electric device, the shell assembly of battery monomer includes: shell body, at least one side plate in multiple side plates of shell body periphery side is formed into reinforcing side plate, reinforcing side plate has reinforcing structure, reinforcing structure is formed into boss projecting towards shell body outside or inside, on the projection plane perpendicular to reinforcing side plate thickness direction, the total projection area of reinforcing structure is A, the area of the figure surrounded by reinforcing side plate outer contour is B, and satisfy: 0.2≤A / B≤0.9.The shell assembly of battery monomer according to the utility model can enhance the structural strength of side plate, resist the force of deformation inward when the internal negative pressure of shell body contracts, so as to guarantee the structural strength of the shell assembly of battery monomer, guarantee the capacity of shell assembly, avoid the core package of battery monomer to be extruded, improve the safety performance of battery monomer, prolong the service life of battery monomer.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a housing assembly for a battery cell, a battery cell, a battery pack, and an electrical device. Background Technology

[0002] Currently, square batteries use stretched aluminum shells as the battery casing. However, during the battery production process, negative pressure is applied to the battery itself, causing the casing to shrink and dent due to insufficient strength. This squeezes the core pack, which may reduce the capacity of the battery cell and affect its lifespan. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a housing assembly for a battery cell, which enhances the structural strength of the reinforcing side plates, improves the housing assembly's resistance to deformation, ensures the capacity of the housing assembly, prevents the core pack from being compressed, and extends its service life.

[0004] This utility model also proposes a battery cell, which includes the housing assembly of the aforementioned battery cell.

[0005] This utility model also proposes a battery pack, which includes the aforementioned battery cells.

[0006] This utility model also proposes an electrical device, which includes the aforementioned battery pack.

[0007] The housing assembly of a battery cell according to an embodiment of the present invention includes: a housing body, at least one of a plurality of side plates on the periphery of the housing body being formed as a reinforcing side plate, the reinforcing side plate having a reinforcing structure, the reinforcing structure being formed as a boss protruding toward the outside or inside of the housing body, the total projected area of ​​the reinforcing structure being A on a projection plane perpendicular to the thickness direction of the reinforcing side plate, the area of ​​the shape enclosed by the outer contour of the reinforcing side plate being B, and satisfying: 0.2≤A / B≤0.9.

[0008] According to an embodiment of the present invention, the battery cell housing assembly comprises a reinforcing side plate formed by at least one of a plurality of side plates on the periphery of the housing body. The reinforcing side plate has a reinforcing structure, which is formed as a boss protruding towards the outside or inside of the housing body. On the projection plane perpendicular to the thickness direction of the reinforcing side plate, the total projected area of ​​the reinforcing structure is A, and the area of ​​the figure enclosed by the outer contour of the reinforcing side plate is B, where 0.2≤A / B≤0.9. The area of ​​the reinforcing structure can be balanced with the area of ​​the portion of the reinforcing side plate other than the reinforcing structure, thereby enhancing the structural strength of the side plate. When the housing body contracts under negative pressure, the side plate resists the inward deformation force, thus ensuring the structural strength of the battery cell housing assembly, ensuring the capacity of the housing and assembly, preventing the battery cell core from being squeezed, improving the safety performance of the battery cell, and extending the service life of the battery cell.

[0009] In addition, the housing assembly of the battery cell according to this utility model may also have the following additional technical features: In some embodiments, the reinforcing structure is located in the middle region of the reinforcing side plate.

[0010] In some embodiments, the reinforcing side plate is an axisymmetric plate or a centrosymmetric plate.

[0011] In some embodiments, the height of the reinforcing structure is H, and satisfies: 0.2mm≤H≤5mm; and / or, the thickness of the portion of the reinforcing side plate other than the reinforcing structure is T1, the thickness of the reinforcing structure is T2, and satisfies: 0.8≤T2 / T1≤1.2.

[0012] In some embodiments, the reinforcing structure is one or a plurality of structures spaced apart; and / or, along the height direction of the reinforcing side plate, the minimum distance between the reinforcing structure and the outer contour of the reinforcing side plate is M, the height of the reinforcing side plate is N, and satisfies: M≥0.1N.

[0013] In some embodiments, the reinforcing structure includes a plurality of sub-reinforcing structures, which are arranged along the circumferential direction of the reinforcing side plate, and the ends of the plurality of sub-reinforcing structures near the center of the reinforcing structure are interconnected.

[0014] In some embodiments, on a projection plane perpendicular to the thickness direction of the reinforcing side plate, the area of ​​the shape enclosed by the outer contour of the reinforcing side plate is B, the diameter of the inscribed circle of the reinforcing structure is D, and the following condition is satisfied: 0 < B ≤ 7500 mm 2 When D≥2mm, when B>7500mm 2When D ≥ 5mm; and / or, on the projection plane perpendicular to the thickness direction of the reinforcing side plate, the ends of two adjacent sub-reinforcing structures are connected by an arc segment with radius R, and the area of ​​the figure enclosed by the outer contour of the reinforcing side plate is B, and satisfies: when 0 < B ≤ 7500mm 2 When R ≥ 1 mm, and B > 7500 mm 2 When R ≥ 3mm.

[0015] According to an embodiment of the present invention, a battery cell includes: a housing assembly of the battery cell described above; and a core package disposed within the housing body, wherein the core package is spaced apart from the side plate.

[0016] According to the embodiments of the present invention, the battery cell, through a housing assembly having the aforementioned battery cell, has at least one of a plurality of side plates on the periphery of the housing body forming a reinforcing side plate. The reinforcing side plate has a reinforcing structure, which is formed as a protrusion protruding towards the outside or inside of the housing body. On the projection plane perpendicular to the thickness direction of the reinforcing side plate, the total projected area of ​​the reinforcing structure is A, and the area of ​​the shape enclosed by the outer contour of the reinforcing side plate is B, where 0.2≤A / B≤0.9. This allows for a balance between the area of ​​the reinforcing structure and the area of ​​the portion of the reinforcing side plate other than the reinforcing structure, thereby enhancing the structural strength of the side plate. When the housing body contracts under negative pressure, it resists the inward deformation force, thus ensuring the structural strength of the battery cell housing assembly, ensuring the capacity of the housing assembly, preventing the battery cell core from being squeezed, improving the safety performance of the battery cell, and extending the service life of the battery cell.

[0017] This utility model also provides a battery pack having the above-described embodiments.

[0018] According to the embodiments of the present invention, by providing the above-mentioned battery cells, the total capacity of the battery pack can be increased, the safety performance of the battery pack can be improved, and the service life of the battery pack can be extended.

[0019] This utility model also provides an electrical device having the above-described embodiments.

[0020] According to the embodiments of the present invention, by providing the above-mentioned battery pack, the charging frequency of the electrical device can be reduced, the safety of the electrical device can be improved, and the user experience can be enhanced.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of a battery cell according to an embodiment of the present utility model; Figure 2 This is a front view of a battery cell according to an embodiment of the present utility model; Figure 3 It is along Figure 2 A cross-sectional view of the EE line; Figure 4 yes Figure 3 Enlarged view at point F; Figure 5 This is a perspective view of the housing assembly of a battery cell according to the first embodiment of the present invention; Figure 6 This is a perspective view of the housing assembly of a battery cell according to the second embodiment of the present utility model; Figure 7 This is a front view of the housing assembly of a battery cell according to the second embodiment of the present invention.

[0023] Figure label: 100. Battery cell; 10. Housing assembly; 1. Shell body; 11. Reinforced side plate; 12. Reinforcing structure; 121. Sub-reinforcing structure; 122. Arc segment; 13. Side plate; 131. First side plate; 132. Second side plate; 14. Bottom plate; 2. Top cover; 21. Explosion-proof valve; 20. Core package. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The housing assembly 10 of the battery cell 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, the housing assembly 10 of the battery cell 100 according to an embodiment of the present invention includes a housing body 1.

[0030] Specifically, in conjunction with the reference appendix Figure 2 and attached Figure 3As shown, the core pack 20 of the battery cell 100 is disposed within the casing body 1. The casing body 1 protects the core pack 20, which helps ensure the reliability of the battery cell 100. At least one of the multiple side plates 13 on the periphery of the casing body 1 is formed as a reinforcing side plate 11, and the reinforcing side plate 11 has a reinforcing structure 12. By designing the reinforcing structure 12 on at least a portion of the side plates 13 of the casing body 1, the structural strength of the reinforcing side plate 11 can be enhanced. When the casing body 1 contracts under negative pressure, it resists the inward deformation force, thereby improving the deformation resistance of the casing assembly 10 of the battery cell 100, ensuring the capacity of the casing assembly 10, preventing the core pack 20 of the battery cell 100 from being squeezed, improving the safety performance of the battery cell 100, and extending the service life of the battery cell 100. It should be noted that the casing body 1 does not come into contact with the core pack 20 before or after being deformed by pressure.

[0031] Further, see attached document. Figure 4 and attached Figure 5 As shown, the reinforcing structure 12 is formed as a protrusion facing the outside or inside of the shell body 1. The reinforcing structure 12 can be formed on the reinforcing side plate 11 through plastic deformation. While enhancing the structural strength and playing a buffering role, it can save the production material of the shell body 1 as much as possible and facilitate the production and processing of the shell body 1.

[0032] Furthermore, see the attached document. Figure 5 As shown, in the direction perpendicular to the thickness of the reinforcing side plate 11 (see attached diagram) Figure 4 On the projection plane of the first direction shown, the total projected area of ​​the reinforcing structure 12 is A, and the area of ​​the shape enclosed by the outer contour of the reinforcing side plate 11 is B, satisfying: 0.2≤A / B≤0.9. This balance can be achieved between the area of ​​the reinforcing structure 12 and the area of ​​the portion of the reinforcing side plate 11 excluding the reinforcing structure 12, ensuring the structural strength of the reinforcing structure 12, better resisting inward deformation forces, ensuring the structural strength of the housing assembly 10 of the battery cell 100, ensuring the capacity of the housing assembly 10, preventing the core pack 20 of the battery cell 100 from being squeezed, improving the safety performance of the battery cell 100, and extending the service life of the battery cell 100. For example, the ratio A / B of the total projected area A of the reinforcing structure 12 and the area B of the shape enclosed by the outer contour of the reinforcing side plate 11 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9.

[0033] It should be noted that the reference appendix Figure 5 As shown, the shell body 1 is a single piece. Along the circumferential direction of the shell body 1, the shell body 1 includes four side plates 13, of which along the first direction (e.g.) Figure 5 As shown, the two opposite side plates 13 are the first side plates 131, along the second direction (as shown). Figure 5(As shown) The two opposite side plates 13 are the second side plates 132.

[0034] At least one of the multiple side plates 13 on the periphery of the shell body 1 is formed as a reinforcing side plate 11. When only one of the four side plates 13 on the periphery of the shell body 1 is formed as a reinforcing side plate 11, it can be either only one first side plate 131 or only one second side plate 132. When two of the four side plates 13 on the periphery of the shell body 1 are formed as reinforcing side plates 11, it can be either two first side plates 131 or two second side plates 132. Plate 11 can also be formed as a first side plate 131 and a second side plate 132 as a reinforcing side plate 11; when three of the four side plates 13 on the periphery of the shell body 1 are formed as reinforcing side plates 11, it can be two first side plates 131 and one second side plate 132, or it can be one first side plate 131 and two second side plates 132; when all four side plates 13 on the periphery of the shell body 1 are formed as reinforcing side plates 11, both the two first side plates 131 and the two second side plates 132 are formed as reinforcing side plates 11.

[0035] In a specific example, see Appendix Figure 5 As shown, the two first side plates 131 and the two second side plates 132 are all formed as reinforcing side plates 11, which can maximize the structural strength of the shell body 1, improve the deformation resistance of the shell assembly 10 of the battery cell 100, ensure the capacity of the shell assembly 10, prevent the core pack 20 of the battery cell 100 from being squeezed, and improve the safety performance of the battery cell 100.

[0036] Furthermore, in conjunction with the reference appendix Figure 1 and attached Figure 2 The shell body 1 includes four side plates 13 and a bottom plate 14, the bottom plate 14 being connected to the four side plates 13 along a third direction (e.g., Figure 2 On the same side as shown, the housing assembly 10 also includes a top cover 2. The top cover 2 is disposed on the side of the four side plates 13 opposite to the bottom plate 14. The top cover 2 is provided with an explosion-proof valve 21. When the temperature rises and the pressure increases suddenly due to short circuit, overcharge or external impact inside the battery cell 100, the explosion-proof valve 21 can release high-temperature gas and electrolyte in a directional manner by bursting or melting to prevent the battery cell 100 from exploding, thereby improving the safety of the battery cell 100.

[0037] According to an embodiment of the present invention, the housing assembly 10 of the battery cell 100 is formed by at least one of the multiple side plates 13 on the periphery of the housing body 1 as a reinforcing side plate 11. The reinforcing side plate 11 has a reinforcing structure 12, which is formed as a boss protruding towards the outside or inside of the housing body 1. On the projection plane perpendicular to the thickness direction of the reinforcing side plate 11, the total projected area of ​​the reinforcing structure 12 is A, and the area of ​​the figure enclosed by the outer contour of the reinforcing side plate 11 is B, where 0.2≤A / B≤0.9. The area of ​​the reinforcing structure 12 can be balanced with the area of ​​the part of the reinforcing side plate 11 other than the reinforcing structure 12 as required, thereby enhancing the structural strength of the side plate 13. When the housing body 1 is compressed under negative pressure, it resists the inward deformation force, thereby ensuring the structural strength of the housing assembly 10 of the battery cell 100, ensuring the capacity of the housing assembly 10, preventing the core pack 20 of the battery cell 100 from being squeezed, improving the safety performance of the battery cell 100, and extending the service life of the battery cell 100.

[0038] In some embodiments of this utility model, reference is made to the appendix. Figure 5 and attached Figure 6 As shown, the reinforcing structure 12 is located in the middle region of the reinforcing side plate 11. It can be understood that by observing the deformation of the shell body 1 under pressure in a vacuum, it can be found that the central region of the side plate 13 is relatively severely concave. Therefore, by setting the reinforcing structure 12 in the middle region of the reinforcing side plate 11, the structural strength of the middle region of the reinforcing side plate 11 can be strengthened, the ability of the middle region of the reinforcing side plate 11 to resist deformation can be enhanced, thereby reducing the amount of deformation in the middle region of the reinforcing side plate 11 and ensuring the appearance of the shell body 1.

[0039] In some embodiments of this utility model, reference is made to the appendix. Figure 5 and attached Figure 6 As shown, the reinforcing side plate 11 is an axisymmetric or centrosymmetric plate, which can make the reinforcing side plate 11 as evenly stressed as possible, reduce the difference in deformation of the reinforcing side plate 11 in the circumferential direction of the shell body 1, reduce the possibility of stress concentration in the reinforcing side plate 11, and ensure the appearance of the shell body 1. For example, when the reinforcing structure 12 is located at the center of the reinforcing side plate 11, the reinforcing structure 12 can be an axisymmetric or centrosymmetric shape such as a rectangle, circle, annulus, ellipse, or oblong. It should be noted that when multiple side plates 13 are formed as reinforcing side plates 11 around the shell body 1, the shapes of the reinforcing structures 12 on the multiple reinforcing side plates 11 can be different.

[0040] In some embodiments of this utility model, reference is made to the appendix. Figure 4As shown, the height of the reinforcing structure 12 is H, and it satisfies the condition: 0.2mm ≤ H ≤ 5mm. This ensures that the reinforcing structure 12 has sufficient pressure buffer distance, better resists inward deformation forces, protects the structural strength of the housing assembly 10 of the battery cell 100, ensures the capacity of the housing assembly 10, prevents the core pack 20 of the battery cell 100 from being squeezed, improves the safety performance of the battery cell 100, and extends the service life of the battery cell 100. For example, the height H of the reinforcing structure 12 can be 0.2mm, 0.5mm, 1mm, 2mm, 3mm, 3.5mm, 4mm, or 5mm.

[0041] In some embodiments of this utility model, reference is made to the appendix. Figure 4 As shown, the thickness of the portion of the reinforcing side plate 11 excluding the reinforcing structure 12 is T1, and the thickness of the reinforcing structure 12 is T2, satisfying the condition: 0.8 ≤ T2 / T1 ≤ 1.2. This ensures the consistency of the structural strength of the reinforcing side plate 11 as much as possible, avoids weak areas in the reinforcing side plate 11, and guarantees the overall structural strength of the reinforcing side plate 11. This improves the deformation resistance of the shell body 1, ensures the capacity of the shell assembly 10, prevents the core pack 20 of the battery cell 100 from being squeezed, improves the safety performance of the battery cell 100, and extends the service life of the battery cell 100. For example, the ratio T2 / T1 of the thickness T2 of the reinforcing structure 12 to the thickness T1 of the portion of the reinforcing side plate 11 excluding the reinforcing structure 12 can be 0.8, 0.9, 1.0, 1.1, or 1.2.

[0042] In some embodiments of this utility model, the reinforcing structure 12 may be one or multiple structures spaced apart. The number, position, shape, and size of the reinforcing structures 12 can be adjusted to strengthen different positions of the reinforcing side plate 11, thereby meeting different structural strength requirements of the reinforcing side plate 11. For example, the reinforcing structure 12 may be one, two, three, four, or five. It should be noted that when multiple reinforcing structures 12 are spaced apart, the multiple reinforcing structures 12 are symmetrically arranged about the centerline of the reinforcing side plate 11 along the circumferential direction of the shell body 1. Preferably, when there is one reinforcing structure 12, the reinforcing structure 12 is located in the central region of the reinforcing side plate 11; when there are multiple reinforcing structures 12 spaced apart, at least one reinforcing structure 12 is located in the central region of the reinforcing side plate 11.

[0043] In a further embodiment of this utility model, along the height direction of the reinforcing side plate 11 (see attached figure) Figure 7As shown in the third direction), the minimum distance between the reinforcing structure 12 and the outer contour of the reinforcing side plate 11 is M, and the height of the reinforcing side plate 11 is N, and satisfies: M≥0.1N, to avoid the reinforcing structure 12 being too close to the edge of the reinforcing side plate 11, to avoid the setting of the reinforcing structure 12 affecting the edge structural strength of the reinforcing side plate 11, to ensure the normal connection between the reinforcing side plate 11 and the top cover 2, and to reduce the manufacturing and processing difficulty of the housing assembly 10 of the battery cell 100.

[0044] In a specific example, see Appendix Figure 7 As shown, along the height direction of the reinforcing side plate 11, the minimum distance between the reinforcing structure 12 and the upper end of the reinforcing side plate 11 is M1, and the minimum distance between the reinforcing structure 12 and the lower end of the reinforcing side plate 11 is M2. Since the minimum distance M between the reinforcing structure 12 and the outer contour of the reinforcing side plate 11 is M≥0.1N, therefore M1≥0.1N and M2≥0.1N.

[0045] In a further embodiment of this utility model, reference is made to the appendix. Figure 6 and attached Figure 7 As shown, the reinforcing structure 12 includes multiple sub-reinforcing structures 121, which are arranged along the circumferential direction of the reinforcing side plate 11. The ends of the multiple sub-reinforcing structures 121 near the center of the reinforcing structure 12 are interconnected. It can be understood that by observing the deformation of the shell body 1 under pressure in a vacuum, it can be found that the central area of ​​the side plate 13 is relatively severely concave. Therefore, by making the ends of the multiple sub-reinforcing structures 121 near the center of the reinforcing structure 12 interconnected and the other ends extending in a direction away from each other, the force on the center of the reinforcing side plate 11 can be dispersed from multiple directions to better resist the deformation of the center of the reinforcing side plate 11 caused by pressure, thereby reducing the amount of deformation in the middle area of ​​the reinforcing side plate 11 and ensuring the appearance of the shell body 1.

[0046] For example, the number of sub-reinforcing structures 121 of reinforcing structure 12 can be three, four, or five. In a specific example, refer to the appendix... Figure 6 and attached Figure 7 As shown, the reinforcing structure 12 includes three sub-reinforcing structures 121. The three sub-reinforcing structures 121 are arranged along the circumferential direction of the reinforcing side plate 11, and the ends of the three sub-reinforcing structures 121 near the center of the reinforcing side plate 11 are connected to each other to form a "Y"-shaped reinforcing structure 12. This structure can disperse the force on the center of the reinforcing side plate 11 from three directions, so as to better resist the deformation of the center of the reinforcing side plate 11 caused by pressure, reduce the amount of deformation in the middle area of ​​the reinforcing side plate 11, and ensure the appearance of the shell body 1.

[0047] In a further embodiment of this utility model, reference is made to the appendix. Figure 7As shown, on the projection plane perpendicular to the thickness direction of the reinforcing side plate 11, the area of ​​the figure enclosed by the outer contour of the reinforcing side plate 11 is B, and the diameter of the inscribed circle of the reinforcing structure 12 is D, satisfying: when 0 < B ≤ 7500 mm 2 When D ≥ 2 mm; when B > 7500 mm 2 When D≥5mm, the diameter D of the inscribed circle of the reinforcing structure 12 can be reasonably adjusted according to the area B of the figure enclosed by the outer contour of the reinforcing side plate 11, so as to ensure that the area of ​​the central region of the reinforcing structure 12 is sufficient. Considering that the inscribed circle of the reinforcing structure 12 is located at the center of the reinforcing side plate 11, the total area of ​​the reinforcing structure 12 can be guaranteed by ensuring the area of ​​the central region of the reinforcing structure 12. The structural strength of the middle region of the reinforcing side plate 11 can be strengthened, the deformation resistance of the middle region of the reinforcing side plate 11 can be enhanced, thereby reducing the deformation of the middle region of the reinforcing side plate 11 and ensuring the appearance of the shell body 1.

[0048] In a further embodiment of this utility model, reference is made to the appendix. Figure 7 As shown, on the projection plane perpendicular to the thickness direction of the reinforcing side plate 11, the ends of two adjacent sub-reinforcing structures 121 that are close to each other are connected by an arc segment 122. The arc segment 122 protrudes toward the inscribed circle of the reinforcing structure 12. The arc segment 122 is designed with rounded corners, which can effectively disperse stress when the shell body 1 contracts under negative pressure, avoid stress concentration at the connection position of the two adjacent sub-reinforcing structures 121, reduce the risk of cracking of the shell body 1, ensure the reliability and stability of the shell assembly 10 of the battery cell 100, and extend the service life of the battery cell 100.

[0049] Further, see attached document. Figure 7 As shown, the radius of the arc segment 122 is R, and the area of ​​the figure enclosed by the outer contour of the reinforcing side plate 11 is B, satisfying the condition: 0 < B ≤ 7500 mm. 2 When R ≥ 1 mm; when B > 7500 mm 2 When R≥3mm, the radius R of the arc segment 122 can be reasonably adjusted according to the area B of the shape enclosed by the outer contour of the reinforcing side plate 11, so as to avoid the connection position of the two adjacent sub-reinforcing structures 121 being too sharp due to the arc segment 122 being too small. This allows for a smooth transition between the two adjacent sub-reinforcing structures 121, effectively dispersing stress when the shell body 1 contracts under negative pressure, further avoiding stress concentration at the connection position of the two adjacent sub-reinforcing structures 121, reducing the risk of cracking of the shell body 1, ensuring the reliability and stability of the shell assembly 10 of the battery cell 100, and extending the service life of the battery cell 100.

[0050] The present invention also proposes a battery cell 100 having a housing assembly 10 of the battery cell 100 of the above embodiments.

[0051] like Figure 3 As shown, the battery cell 100 according to this embodiment of the present invention includes the housing assembly 10 and the core pack 20 of the battery cell 100 described above.

[0052] Specifically, see the attached document. Figure 3 As shown, the core pack 20 is disposed inside the housing body 1, and the core pack 20 is spaced apart from the side plate 13. The housing body 1 can protect the core pack 20, which helps to ensure the reliability of the battery cell 100. It should be noted that the housing body 1 will not come into contact with the core pack 20 before or after being subjected to pressure deformation.

[0053] According to the embodiment of the present invention, the battery cell 100 is provided with a housing assembly 10, and at least one of the multiple side plates 13 on the periphery of the housing body 1 is formed as a reinforcing side plate 11. The reinforcing side plate 11 has a reinforcing structure 12, which is formed as a boss protruding towards the outside or inside of the housing body 1. On the projection plane perpendicular to the thickness direction of the reinforcing side plate 11, the total projected area of ​​the reinforcing structure 12 is A, and the area of ​​the figure enclosed by the outer contour of the reinforcing side plate 11 is B. 0.2≤A / B≤0.9. According to the requirements, the area of ​​the reinforcing structure 12 and the area of ​​the part of the reinforcing side plate 11 other than the reinforcing structure 12 can be balanced to enhance the structural strength of the side plate 13. When the housing body 1 is compressed under negative pressure, it resists the inward deformation force, thereby ensuring the structural strength of the housing assembly 10 of the battery cell 100, ensuring the capacity of the housing assembly 10, avoiding the core pack 20 of the battery cell 100 being squeezed, improving the safety performance of the battery cell 100, and extending the service life of the battery cell 100.

[0054] This utility model also proposes a battery pack having the battery cell 100 described in the above embodiments.

[0055] According to the embodiments of the present invention, by providing the above-mentioned battery cells 100, the total capacity of the battery pack can be increased, the safety performance of the battery pack can be improved, and the service life of the battery pack can be extended.

[0056] This utility model also proposes an electrical device having the battery pack described in the above embodiments.

[0057] The electrical device can be a vehicle, and the battery pack can be installed at the bottom of the vehicle body.

[0058] According to the embodiments of the present invention, by providing the above-mentioned battery pack, the charging frequency of the electrical device can be reduced, the safety of the electrical device can be improved, and the user experience can be enhanced.

[0059] The housing assembly 10 of the battery cell 100, the battery cell 100, the battery pack, and other components and operations of the power supply device according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A housing assembly for a single battery cell, characterized in that, include: A shell body (1), at least one of the multiple side plates (13) on the periphery of the shell body (1) is formed as a reinforcing side plate (11), the reinforcing side plate (11) has a reinforcing structure (12), the reinforcing structure (12) is formed as a boss protruding towards the outside or inside of the shell body (1), on the projection plane perpendicular to the thickness direction of the reinforcing side plate (11), the total projected area of ​​the reinforcing structure (12) is A, the area of ​​the figure enclosed by the outer contour of the reinforcing side plate (11) is B, and satisfies: 0.2≤A / B≤0.

9.

2. The housing assembly of the battery cell according to claim 1, characterized in that, The reinforcing structure (12) is located in the middle region of the reinforcing side plate (11).

3. The housing assembly of the battery cell according to claim 1, characterized in that, The reinforcing side plate (11) is an axisymmetric plate or a centrally symmetric plate.

4. The housing assembly of the battery cell according to claim 1, characterized in that, The height of the reinforcing structure (12) is H, and satisfies: 0.2mm≤H≤5mm; And / or, the thickness of the portion of the reinforcing side plate (11) other than the reinforcing structure (12) is T1, the thickness of the reinforcing structure (12) is T2, and satisfies: 0.8≤T2 / T1≤1.

2.

5. The housing assembly of the battery cell according to any one of claims 1-4, characterized in that, The reinforcing structure (12) may be one or multiple structures spaced apart; And / or, along the height direction of the reinforcing side plate (11), the minimum distance between the reinforcing structure (12) and the outer contour of the reinforcing side plate (11) is M, the height of the reinforcing side plate (11) is N, and satisfies: M≥0.1N.

6. The housing assembly of the battery cell according to any one of claims 1-4, characterized in that, The reinforcing structure (12) includes a plurality of sub-reinforcing structures (121), which are arranged along the circumferential direction of the reinforcing side plate (11), and the ends of the plurality of sub-reinforcing structures (121) near the center of the reinforcing structure (12) are interconnected.

7. The housing assembly of the battery cell according to claim 6, characterized in that, On the projection plane perpendicular to the thickness direction of the reinforcing side plate (11), the area of ​​the figure enclosed by the outer contour of the reinforcing side plate (11) is B, and the diameter of the inscribed circle of the reinforcing structure (12) is D, and the following conditions are met: 0 < B ≤ 7500 mm 2 When D≥2mm, when B>7500mm 2 When D≥5mm; And / or, on a projection plane perpendicular to the thickness direction of the reinforcing side plate (11), the ends of two adjacent sub-reinforcing structures (121) are connected by an arc segment (122) with radius R, and the area of ​​the figure enclosed by the outer contour of the reinforcing side plate (11) is B, satisfying: 0 < B ≤ 7500 mm 2 When R ≥ 1 mm, and B > 7500 mm 2 When R ≥ 3mm.

8. A single battery cell, characterized in that, include: The housing assembly (10) of the battery cell according to any one of claims 1-7; Core package (20) is disposed inside the shell body (1) and is spaced apart from the side plate (13).

9. A battery pack, characterized in that, Includes the battery cell (100) according to claim 8.

10. An electrical device, characterized in that, Includes the battery pack according to claim 9.

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