Battery case and battery

Abstract

The utility model provides a kind of battery case and battery, the battery case is equipped with accommodating cavity, and including two first shell side plates and at least one second shell side plate, two first shell side plates are oppositely arranged along first direction, and first direction is crossed with the height direction of battery case;Second shell side plate is along second direction setting, and second direction is crossed with the height direction of battery case and the virtual plane where first direction is located;Wherein, second shell side plate includes several first arc-shaped parts, and first arc-shaped part is curved towards the outside of second shell side plate along second direction, and a first shell side plate is connected to another first shell side plate by several first arc-shaped parts, to make two first shell side plates and first arc-shaped part surround accommodating cavity, accommodating cavity is suitable for accommodating several electric core components;The extrusion force of battery case to electric core component is reduced by the bending design of first arc-shaped part, to reduce the risk that electric core component is damaged by the extrusion of battery case, to improve the security and durability of battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing and a battery. Background Technology

[0002] As electronic devices evolve towards lighter weight and higher performance, higher demands are placed on the energy density, safety, and structural adaptability of lithium batteries. To meet the demands of the modern automotive industry for high energy storage and compact space layout, structural optimization of lithium batteries has become an important research direction in the field of battery technology.

[0003] In existing technologies, lithium battery casings typically employ square or cylindrical structures. The sharp corners of square casings are prone to stress concentration, leading to casing deformation or even breakage during charge-discharge cycles or mechanical impacts, thus affecting battery safety. Cylindrical casings, due to their shape limitations, have low space utilization within the device, making it difficult to meet the demands of high energy density. Furthermore, for wound core structures, existing square or cylindrical casings cannot perfectly match the radius (R-corners) of the core, resulting in uneven stress on the core during charge and discharge, affecting battery cycle life and electrolyte interface stability. Therefore, existing lithium battery casing structures still require improvement in terms of space utilization, stress distribution, and safety. Utility Model Content

[0004] This embodiment provides a battery casing and a battery to reduce the compressive force of the battery casing on the cell assembly, thereby reducing the risk of damage to the cell assembly due to the compression of the battery casing, and improving the safety and durability of the battery.

[0005] To achieve the above functions, the technical solution provided in this embodiment is as follows:

[0006] In a first aspect, this embodiment provides a battery casing with a receiving cavity, and includes:

[0007] Two first housing side plates are disposed opposite each other along a first direction, the first direction intersecting the height direction of the battery housing; and

[0008] At least one second housing side plate is disposed along a second direction, the second direction intersecting a virtual plane containing the height direction of the battery housing and the first direction. The second housing side plate includes a plurality of first arcuate portions, the first arcuate portions bending outward along the second direction toward the outside of the second housing side plate. Furthermore, one of the first housing side plates is connected to another first housing side plate through the plurality of first arcuate portions, such that the two first housing side plates and the plurality of first arcuate portions surround the receiving cavity, the receiving cavity being adapted to accommodate a plurality of battery cell assemblies.

[0009] In one embodiment, the second housing side plate includes two of the first arcuate portions;

[0010] The receiving cavity includes two receiving sub-cavities, which are adapted to accommodate the battery cell assembly;

[0011] In this configuration, one of the first housing side plates is sequentially connected to another first housing side plate via two first arc-shaped portions, such that each first housing side plate and the corresponding first arc-shaped portion surround the corresponding receiving sub-cavity.

[0012] In one embodiment, the first housing side plate is a straight plate; and / or, the area of ​​the outer side surface of the first housing side plate is greater than the area of ​​the outer side surface of the second housing side plate; and / or, the outer sides of the two first arcuate portions are continuously arranged.

[0013] In one embodiment, the first arcuate portion includes a first inner arcuate wall and a first outer arcuate wall disposed opposite to each other along the second direction, wherein the radius of the circle containing the first outer arcuate wall and the thickness of the cell assembly satisfy the following relationship: R = k·d;

[0014] Where R is the radius of the circle containing the first outer arc wall, d is the thickness of the battery cell assembly in the first charged state, and k is a real number, which is greater than or equal to 0.95 and less than or equal to 1.2.

[0015] In one embodiment, the first state of charge is greater than 0 and less than or equal to 10%, and k is greater than or equal to 1.05 and less than or equal to 1.2;

[0016] Alternatively, the first state of charge is greater than 10% and less than or equal to 50%, and k is greater than or equal to 1 and less than or equal to 1.12;

[0017] Alternatively, the first state of charge is greater than 50% and less than or equal to 100%, and k is greater than or equal to 0.95 and less than or equal to 1.12.

[0018] In one embodiment, the battery casing further includes a base plate, and two first casing side plates and two second casing side plates are disposed around the edge of the base plate. The width of the base plate and the arc length of the first outer arc wall satisfy the following relationship: b1 <L1≤πb1;

[0019] Wherein, b1 is the width of the base plate, and L1 is the arc length of the first outer arc wall.

[0020] In one embodiment, the width of the base plate is greater than or equal to 5 mm and less than or equal to 100 mm.

[0021] In one embodiment, the ratio of the thickness of the base plate to the thickness of the first housing side plate is greater than or equal to 2 and less than or equal to 20.

[0022] And / or, the ratio of the thickness of the base plate to the thickness of the first arcuate portion is greater than or equal to 0.5 and less than or equal to 10;

[0023] And / or, the ratio of the thickness of the first housing side plate to the thickness of the first arcuate portion is greater than or equal to 0.083 and less than or equal to 5.

[0024] In one embodiment, the thickness of the base plate is greater than or equal to 0.6 mm and less than or equal to 2 mm; and / or, the thickness of the first housing side plate is greater than or equal to 0.1 mm and less than or equal to 1 mm; and / or, the thickness of the first arcuate portion is greater than or equal to 0.2 mm and less than or equal to 1.2 mm.

[0025] In one embodiment, the sidewall of the first arcuate portion has an arcuate cross-section along the thickness direction of the battery casing and bends away from the receiving cavity.

[0026] In one embodiment, the battery housing further includes a cover assembly adapted to seal the receiving cavity, the cover assembly including a cover plate including a plurality of second arcuate portions curved outwards from the cover plate along a second direction;

[0027] In this configuration, a second arc-shaped portion is provided corresponding to a first arc-shaped portion, and the second arc-shaped portion matches its corresponding first arc-shaped portion.

[0028] In one embodiment, the second arcuate portion includes a second inner arcuate wall and a second outer arcuate wall disposed opposite to each other along the second direction, wherein the width of the cover plate and the arc length of the second outer arcuate wall satisfy the following relationship: b2 <L2≤πb2;

[0029] Wherein, b2 is the width of the cover plate, and L2 is the arc length of the second outer arc wall.

[0030] In one embodiment, the cover plate assembly further includes an insulating member disposed between the cover plate and the cell assembly, the insulating member including a third arcuate portion that bends outward along the second direction;

[0031] In this configuration, a third arc-shaped portion is provided corresponding to a first arc-shaped portion, and the third arc-shaped portion matches its corresponding first arc-shaped portion.

[0032] In one embodiment, the third arcuate portion includes a third inner arcuate wall and a third outer arcuate wall disposed opposite to each other along the second direction, and the width of the insulating member and the arc length of the third outer arcuate wall satisfy the following relationship: b3 <L3≤πb3;

[0033] Wherein, b3 is the width of the insulating component, and L3 is the arc length of the third outer arc wall.

[0034] Secondly, this utility model also provides a battery, including the battery casing described in the first aspect embodiment.

[0035] In one embodiment, the battery includes a base plate disposed between a base plate and a cell assembly. The base plate is adapted to fix the position of the cell assembly. The base plate includes a fourth arcuate portion that bends outward toward the base plate along a second direction. Each fourth arcuate portion corresponds to a first arcuate portion.

[0036] In one embodiment, the fourth arcuate portion includes a fourth inner arcuate wall and a fourth outer arcuate wall disposed opposite to each other along the second direction, and the width of the base plate and the arc length of the fourth outer arcuate wall satisfy the following relationship: b4 <L4≤πb4;

[0037] Wherein, b4 is the width of the base plate, and L4 is the arc length of the fourth outer arc wall.

[0038] The beneficial effects of this embodiment:

[0039] This utility model provides a battery casing and a battery. The battery casing has a receiving cavity and includes two first casing side plates and at least one second casing side plate. The two first casing side plates are arranged opposite each other along a first direction, which intersects the height direction of the battery casing. The second casing side plate is arranged along a second direction, which intersects the virtual plane containing the height direction and the first direction of the battery casing. Each second casing side plate includes several first arc-shaped portions, which are curved outwards along the second direction. One first casing side plate is connected to another first casing side plate via these arc-shaped portions, so that the two first casing side plates and the first arc-shaped portions surround the receiving cavity, which is suitable for accommodating several battery cell assemblies. The bending design of the first arc-shaped portions reduces the compressive force of the battery casing on the battery cell assemblies, thereby reducing the risk of damage to the battery cell assemblies due to compression by the battery casing, and improving the safety and durability of the battery. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment 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.

[0041] Figure 1 This is a schematic diagram of the battery casing provided in an embodiment of the present utility model;

[0042] Figure 2 This is an exploded view of the battery casing provided in an embodiment of the present invention;

[0043] Figure 3 A top view of the main body of the shell provided in an embodiment of this utility model;

[0044] Figure 4 A bottom view of the main body of the shell provided in an embodiment of this utility model;

[0045] Figure 5 A top view of the cover plate provided in an embodiment of this utility model;

[0046] Figure 6 A top view of the insulating component provided in an embodiment of this utility model;

[0047] Figure 7 An exploded schematic diagram of the battery provided in an embodiment of this utility model;

[0048] Figure 8 This is a schematic diagram of the battery structure from below, provided in an embodiment of the present invention.

[0049] Figure 9 This is a top view of the base plate provided in an embodiment of the present utility model.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1-Battery casing; 1A Casing body; 10-Receiving cavity; 10A-Receiving sub-cavity; 11-First casing side plate; 12-Second casing side plate; 121-First arc-shaped portion; 1211-First inner arc wall; 1212-First outer arc wall; 13-Bottom plate; 131-First sub-part; 132-Second sub-part; 14-Cover plate assembly; 141-Cover plate; 1411-Second arc-shaped portion; 1411A-Second inner arc wall; 1411B-Second outer arc wall; 142-Insulator; 1421-Third arc-shaped portion; 1421A-Third inner arc wall; 1421B-Third outer arc wall;

[0052] 2-Cell assembly; 21-First surface; 22-Second surface;

[0053] 3-Battery; 31-Bottom plate; 311-Fourth arc-shaped part; 311A-Fourth inner arc wall; 311B-Fourth outer arc wall; 312-Permeation hole. Detailed Implementation

[0054] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0055] Please combine Figures 1 to 9 This embodiment provides a battery housing 1, suitable for installing and fixing lithium-ion battery cell assembly 2, especially suitable for high-capacity battery application scenarios such as power batteries for new energy vehicles and battery packs for energy storage systems, which have high requirements for energy density and structural strength; the battery housing 1 is provided with a receiving cavity 10 for accommodating the cell assembly 2, realizing the support, positioning and protection of the cell assembly 2; the cell assembly 2 is installed in the receiving cavity 10, and the opening of the battery housing 1 is sealed by a cover plate assembly provided at one end of the battery housing 1 to form a stable sealed structure.

[0056] The battery housing 1 includes a housing body 1A, which includes two first housing side plates 11 and at least one second housing side plate 12. The two first housing side plates 11 are arranged opposite each other along a first direction X, which intersects the height direction of the battery housing 1. The second housing side plate 12 is arranged along a second direction Y, which intersects the virtual plane containing the height direction of the battery housing 1 and the first direction X. This allows the battery housing 1 to achieve a reasonable distribution of structural rigidity in multiple directions, improving the impact resistance and deformation resistance of the battery housing 1, and enhancing the protective function of the battery housing 1 for the battery cell assembly 2.

[0057] The second housing side plate 12 includes a plurality of first arcuate portions 121, which are curved outward along the second direction Y toward the outer side of the second housing side plate 12. One of the first housing side plates 11 is connected to another first housing side plate 11 by the plurality of first arcuate portions 121, such that the two first housing side plates 11 and the first arcuate portions 121 surround the receiving cavity 10, which is adapted to accommodate a plurality of the battery cell assemblies 2.

[0058] It should be noted that the plurality of first arc-shaped portions 121 refer to the arc-shaped connecting portions on the second housing side plate 12 that can be provided according to the number of the battery cell assemblies 2, and the number of them can be one, two, three or more.

[0059] It is understood that by providing the first arc-shaped portion 121 on the second housing side plate 12, the side profile of the battery housing 1 and the cell assembly 2 can fit better. This is especially suitable for the design of the cell assembly 2, which is either wound or has a rounded corner structure. This reduces the local stress concentration problem caused by the sudden change in rigidity of the battery housing 1, thereby reducing the risk of damage to the cell assembly 2 caused by the squeezing of the battery housing 1 during assembly or use, and thus extending the service life of the cell assembly 2. At the same time, compared with the right-angled battery housing 1 structure design in related technologies, the second housing side plate 12 including the first arc-shaped portion 121 can improve the utilization efficiency of the internal space of the battery housing 1, improve the compactness of the cell assembly 2 arrangement while ensuring the strength of the battery housing 1, and improve the energy density of the cell assembly 2.

[0060] Furthermore, the sidewall of the first arc-shaped portion 121 has a complete and continuous arc curve in the cross section along the thickness direction parallel to the battery housing 1. Its outline has no straight segments or non-arc structures, and the whole is bent in the direction away from the receiving cavity 10. This ensures structural strength while giving the second housing side plate 12 a uniform arc shape, which is beneficial for the assembly and structural fit of the cell assembly 2.

[0061] Specifically, the housing body 1A includes two first housing side plates 11 and two second housing side plates 12. The two first housing side plates 11 are arranged opposite each other along the first direction X, and the two second housing side plates 12 are arranged opposite each other along the second direction Y. The two first housing side plates 11 and the two second housing side plates 12 together form a receiving cavity 10 for accommodating the battery cell assembly 2. The battery cell assembly 2 has a wound structure, and the side of the battery cell assembly 2 near the second housing side plate 12 has a rolled surface. In order to fit well with the rolled surface structure of the battery cell assembly 2, each second housing side plate 12 includes a first arc-shaped portion 121. The first arc-shaped portion 121 is bent towards the outside of the second housing side plate 12 along the second direction Y, so that the second housing side plate 12 as a whole presents a contour that matches the side shape of the battery cell assembly 2.

[0062] The side of the first arc-shaped portion 121 near the cell assembly 2 and the side of the cell assembly 2 near the first arc-shaped portion 121 have a matching curved surface gap. The gap can provide necessary buffer space when the cell assembly 2 undergoes dimensional changes due to thermal expansion or contraction during charging and discharging, preventing direct compression or structural interference between the cell assembly 2 and the battery casing 1, reducing the risk of damage to the cell assembly 2 caused by collision or pressure, thereby extending the cycle life of the cell assembly 2.

[0063] It should be noted that, in this embodiment, the first direction X can be the width direction of the battery casing 1, and the first direction corresponds to... Figure 1 The X direction; the second direction Y can be the length direction of the battery casing 1, and the second direction corresponds to Figure 1 The Y direction in the middle; the height direction of the battery casing 1 can be a third direction Z, the third direction corresponding to Figure 1 The Z direction in the equation.

[0064] In one embodiment, the second housing side plate 12 includes two first arcuate portions 121; the receiving cavity 10 includes two receiving sub-cavities 10A, the receiving sub-cavities 10A being adapted to receive the cell assembly 2, and the geometry of the receiving sub-cavities 10A matching the shape of the cell assembly 2. The first arcuate portion 121 is located on the side closest to the corresponding cell assembly 2, and the side of the first arcuate portion 121 closest to the cell assembly 2 and the side of the cell assembly 2 closest to the first arcuate portion 121 have a matching curved surface gap. This curved surface gap provides a buffer space for the dimensional changes of the cell assembly 2 due to expansion during charging and discharging, preventing rigid contact or squeezing collisions between the cell assembly 2 and the battery housing 1, and reducing the risk of damage or safety hazards to the cell assembly 2.

[0065] Furthermore, one of the first housing side plates 11 is sequentially connected to another first housing side plate 11 through two first arc-shaped portions 121, so that each first housing side plate 11 and the corresponding first arc-shaped portion 121 together form a corresponding receiving sub-cavity 10A. Through the independent cavity design, multiple battery cell components 2 can be independently packaged, so that they do not interfere with each other when the battery cell components 2 generate thermal expansion during charging and discharging, avoiding the problem of structural stress superposition caused by thermal expansion coupling, and improving the stability and safety of the battery cell components 2.

[0066] Meanwhile, since the second housing side plate 12 includes two first arc-shaped portions 121, forming a segmented arc-shaped connection structure, the segmented arc-shaped connection structure can transform the stress that may originally be concentrated in a single bending part into multiple stress distribution points, thereby dispersing the mechanical load borne by the battery housing 1, reducing the stress concentration area, reducing the risk of local deformation or structural fatigue of the battery housing 1, and thus extending the service life of the battery housing 1; wherein, the two receiving sub-cavities 10A are interconnected, so that the liquid injection process can be uniformly injected without increasing the complexity of the operation, thereby simplifying the manufacturing process, improving production efficiency, and improving consistency and yield.

[0067] In one embodiment, the battery cell assembly 2 includes two first surfaces 21 disposed opposite to each other along the first direction X and two second surfaces 22 disposed opposite to each other along the second direction Y. The first surfaces 21 can be planar structures extending along the first direction X, and the second surfaces 22 can be planar structures extending along the second direction Y. When assembling the battery cell assembly 2, the first surfaces 21 of two adjacent battery cell assemblies 2 can be bonded together to achieve high-density stacking and improve the stacking efficiency and space utilization of the battery cell assembly 2. At the same time, the first surfaces 21 are planar contact interfaces, which is conducive to the full filling of thermal interface materials (such as thermally conductive adhesive, thermally conductive pads, etc.), so that heat can be more efficiently conducted from the battery cell assembly 2 to the battery casing 1 or heat dissipation structure, thereby improving the thermal conduction efficiency of the battery cell assembly 2.

[0068] Furthermore, the first housing side plate 11 has a straight plate structure, and the area of ​​the outer side of the first housing side plate 11 is larger than the area of ​​the outer side of the second housing side plate 12. The first housing side plate 11 is in contact with the first surface 21 of the cell assembly 2, thereby increasing the contact area between the first housing side plate 11 and the cell assembly 2, enhancing the efficiency of heat conduction from the cell assembly 2 to the battery housing 1, thereby improving the heat dissipation performance of the battery housing 1 during operation, reducing the surface temperature of the cell assembly 2, and extending the service life of the cell assembly 2. At the same time, the increased contact area also provides stronger structural support capabilities, and can better limit, support, and protect the cell assembly 2 under the action of charging and discharging expansion or external impact loads.

[0069] In addition, the straight plate structure is easier to process using conventional metal stamping, bending or extrusion processes compared to complex curved surface structures; by setting the first housing side plate 11 as a straight plate structure, the first housing side plate 11 has higher processing efficiency and dimensional consistency, thereby improving the production yield and consistency of the battery housing 1.

[0070] Specifically, the outer surfaces of the two first arc-shaped portions 121 are continuously arranged, while a smooth transition curved surface structure is formed on the second housing side plate 12. This eliminates sharp angles or abrupt transitions that may exist at the segmented connection points, avoids stress concentration at specific connection points, thereby improving the structural stability of the battery housing 1 under thermal expansion and contraction or external force, and thus improving the fatigue resistance and service life of the battery housing 1.

[0071] Meanwhile, the continuous outer curved surface structure eliminates gaps or splicing weaknesses caused by segmented connections. While ensuring structural strength, it helps to improve the airtightness and waterproof performance of the battery casing 1, preventing moisture or foreign objects from entering the casing and ensuring the reliability of the battery cell assembly 2 in complex environments.

[0072] It should be noted that the above description of "the first housing side plate 11 is a straight plate, the area of ​​the outer side of the first housing side plate 11 is larger than the area of ​​the outer side of the second housing side plate 12, and the outer sides of the two first arcuate portions 121 are continuously arranged" is intended as an illustrative example. This embodiment does not impose specific restrictions on the specific shape of the first housing side plate 11, the area of ​​the outer side of the first housing side plate 11, the area of ​​the outer side of the second housing side plate 12, or whether the outer sides of the two first arcuate portions 121 are continuously connected. In practical applications, designers can flexibly adjust and optimize the relevant structural parameters according to specific functional requirements, manufacturing processes, and engineering conditions to achieve the best performance and manufacturing adaptability, and meet the diverse requirements of different application scenarios.

[0073] In one embodiment, the first arcuate portion 121 includes a first inner arcuate wall 1211 and a first outer arcuate wall 1212 disposed opposite to each other along the second direction Y. The radius of the circle containing the first outer arcuate wall 1212 and the thickness of the battery cell assembly 2 satisfy the following relationship: R = k·d; where R is the radius of the circle containing the first outer arcuate wall 1212, d is the thickness of the battery cell assembly 2 in the first state of charge, and k is a real number, which is greater than or equal to 0.95 and less than or equal to 1.2. By controlling the relationship between the radius of the circle containing the first outer arcuate wall 1212 and the thickness of the battery cell assembly 2, an adaptation space is provided for the thickness change of the battery cell assembly 2 during the charging and discharging process, thereby avoiding the risk of stress concentration in the battery cell assembly 2. The first state of charge refers to the ratio of the current capacity (in ampere-hours Ah or watt-hours Wh) of the battery cell assembly 2 to its nominal capacity under no-load conditions.

[0074] Understandably, by controlling k to be greater than or equal to 0.95, the curvature of the first outer arc wall 1212 can be prevented from being too large, avoiding insufficient gap between the edge of the cell assembly 2 and the second housing sidewall, thereby effectively preventing mechanical damage caused by the cell expanding during charging and discharging due to compression and collision with the housing sidewall; at the same time, controlling k to be less than or equal to 1.2 can prevent the arc surface of the first outer arc wall 1212 from being too gentle, reducing the ineffective space occupation inside the battery housing 1, improving space utilization, reducing material waste, and thus reducing the manufacturing cost of the battery housing 1.

[0075] Specifically, the first state of charge d is greater than 0 and less than or equal to 10%, k is greater than or equal to 1.05 and less than or equal to 1.2, and the cell assembly 2 is in a low state of charge, in the initial expansion stage. By setting k to be greater than or equal to 1.05, a reasonable buffer space is reserved for the expansion process of the cell assembly 2 during subsequent charging and discharging, avoiding excessive constraint of the battery casing 1 on the cell assembly 2. At the same time, by setting k to be less than or equal to 1.2, the side of the battery casing 1 and the cell assembly 2 can fit better, improving structural adaptability.

[0076] In one embodiment, the first state of charge is greater than 10% and less than or equal to 50%, k is greater than or equal to 1 and less than or equal to 1.12, and the cell assembly 2 is in a medium state of charge and a medium expansion stage. By setting k to be greater than or equal to 1, the thickness increase requirement of the cell assembly 2 in the medium state of charge is adapted, providing adaptation space for the expansion process of the cell assembly 2 during charging and discharging. At the same time, by setting k to be less than or equal to 1.12, the arc surface of the first outer arc wall 1212 is avoided from being too flat, reducing the ineffective space occupation inside the battery casing 1, improving space utilization, reducing material waste, and thus reducing the manufacturing cost of the battery casing 1.

[0077] In one embodiment, the first state of charge is greater than 50% and less than or equal to 100%, k is greater than or equal to 0.95 and less than or equal to 1.12, and the cell assembly 2 is in a high state of charge, in the maximum expansion stage. By setting k to be greater than or equal to 0.95, the radius of curvature of the first outer arc wall 1212 can adapt to the maximum expansion thickness of the cell assembly 2, preventing the battery casing 1 from excessively squeezing the cell assembly 2. At the same time, by setting k to be less than or equal to 1.12, an appropriate contact pressure is maintained between the first outer arc wall 1212 and the cell surface, avoiding interface damage caused by excessive contact stress.

[0078] It should be noted that the above descriptions that "the first state of charge d is greater than 0 and less than or equal to 10%, and k is greater than or equal to 1.05 and less than or equal to 1.2; or, the first state of charge is greater than 10% and less than or equal to 50%, and k is greater than or equal to 1 and less than or equal to 1.12; or, the first state of charge is greater than 50% and less than or equal to 100%, and k is greater than or equal to 0.95 and less than or equal to 1.12" are all exemplary illustrations, and do not constitute the only limitation on the first state of charge or the k value; in practical applications, designers can flexibly adjust the interval division of the first state of charge and the setting of the k value according to factors such as the cell material characteristics, operating voltage range, and structural design requirements, so as to improve the adaptability of the battery housing 1 and meet the needs of diversified engineering or manufacturing scenarios.

[0079] In one embodiment, the battery housing 1 further comprises a bottom plate 13, two first housing side plates 11 and two second housing side plates 12 are arranged around the edge of the bottom plate 13, and the relationship between the width of the bottom plate 13 and the arc length of the first outer arc wall 1212 satisfies: b1<L1≤πb1; where b1 is the width of the bottom plate 13, and L1 is the arc length of the first outer arc wall 1212. By controlling the magnitude relationship between the width of the bottom plate 13 and the arc length of the first outer arc wall 1212, the internal space distribution of the battery housing 1 is optimized, so that the arrangement of the cell assembly 2 is more compact, and the space utilization rate of the battery housing 1 is further improved.

[0080] It can be understood that by setting L1≤πb1, it is possible to avoid an excessively large arc length of the first outer arc wall 1212 that leads to a loose structure of the battery housing 1 and affects the mechanical strength of the battery housing 1; at the same time, setting b1<L1 enables the first outer arc wall 1212 to have an appropriate radius of curvature, providing necessary buffer space for the expansion of the cell assembly 2, preventing the battery housing 1 from imposing excessive constraint on the cell assembly 2, and reducing the risk of damage to the cell assembly 2.

[0081] Further, the bottom plate 13 comprises two first sub-portions 131 disposed opposite to each other along the second direction Y, and a second sub-portion 132 located between the two first sub-portions 131. The first sub-portion 131 comprises a protruding portion, which protrudes in the direction away from the second sub-portion 132 along the second direction Y; wherein the outer side of the protruding portion is a circular arc, the arc length of the circular arc is greater than or equal to the arc length of the first outer arc wall 1212, thereby forming a continuous and smooth transition curved surface, so that the expansion and deformation of the cell assembly 2 during the charging and discharging process can be uniformly distributed along the circular arc surface; at the same time, the arc lengths of the protruding portion and the first outer arc wall 1212 are matched with each other, so that the rigidity of the battery housing 1 maintains continuity, and the risk of fatigue cracks caused by local sudden change in the rigidity of the battery housing 1 is avoided.

[0082] Specifically, the width of the base plate 13 is greater than or equal to 5 mm and less than or equal to 100 mm. By controlling the width of the base plate 13 to be greater than or equal to 5 mm, the bottom of the battery housing 1 is ensured to have sufficient load-bearing capacity and structural rigidity, thereby improving the bending and deformation resistance of the battery housing 1 and enhancing its structural reliability during transportation, assembly, and use. At the same time, by setting the width of the base plate 13 to be greater than or equal to 5 mm and less than or equal to 100 mm, the typical base plate requirements range from small energy storage modules to large power battery modules are covered, enhancing the versatility and scalability of the battery housing 1 and meeting the structural design requirements of various new energy vehicles or energy storage devices.

[0083] In one embodiment, the ratio of the thickness of the base plate 13 to the thickness of the first housing side plate 11 is greater than or equal to 2 and less than or equal to 20; wherein the thickness of the base plate 13 is greater than or equal to 0.6 mm and less than or equal to 2 mm; the thickness of the first side wall is greater than or equal to 0.1 mm and less than or equal to 1 mm; by controlling the proportional relationship between the thickness of the base plate 13 and the thickness of the first housing side plate 11, the base plate 13 has stronger bending and impact resistance, and can play a major load-bearing support role during the stacking pressure, transportation vibration or structural fixation of the battery cell assembly 2, so as to avoid the deformation or collapse of the battery housing 1 due to insufficient force on the base plate 13.

[0084] The ratio of the thickness of the base plate 13 to the thickness of the first arc-shaped portion 121 is greater than or equal to 0.5 and less than or equal to 10; wherein the thickness of the third sidewall is greater than or equal to 0.2 mm and less than or equal to 1.2 mm; by controlling the proportional relationship between the thickness of the base plate 13 and the thickness of the first arc-shaped portion 121, the base plate 13 has a structural strength equivalent to that of the first arc-shaped portion 121, enabling the base plate 13 to effectively bear loads from cell stacking, assembly pressure, or external impacts, thus playing a structural foundation support role; at the same time, maintaining the relative flexibility of the first arc-shaped portion 121 allows the first arc-shaped portion 121 to undergo elastic deformation during the charging and discharging of the cell assembly 2, providing buffer space for the expansion of the cell assembly 2, and preventing stress concentration and damage to the battery casing 1.

[0085] The ratio of the thickness of the first housing side plate 11 to the thickness of the first arc-shaped portion 121 is greater than or equal to 0.083 and less than or equal to 5, thereby avoiding the first housing side plate 11 being too thin and ensuring that the first housing side plate 11 has sufficient mechanical strength and rigidity to meet the requirements of the first housing side plate 11 for covering and supporting the battery cell assembly 2, thereby improving the stability of the battery housing 1. At the same time, by controlling the proportional relationship between the thickness of the first housing side plate 11 and the thickness of the first arc-shaped portion 121, the first housing side plate 11 and the first arc-shaped portion 121 are kept coordinated in terms of structural stress transmission and deformation response, preventing structural failure problems such as connection fatigue, stress accumulation or crack propagation caused by excessive thickness difference.

[0086] In one embodiment, the battery housing 1 further includes a cover assembly 14 adapted to seal the receiving cavity 10. The cover assembly 14 includes a cover 141, which includes a plurality of second arcuate portions 1411. The second arcuate portions 1411 are curved outward along the second direction. Each second arcuate portion 1411 corresponds to a first arcuate portion 121, and the second arcuate portion 1411 matches its corresponding first arcuate portion 121, thereby improving the sealing performance of the battery housing 1.

[0087] Specifically, the shape of the second arc-shaped portion 1411 matches the shape of its corresponding first arc-shaped portion 121. Since both the first arc-shaped portion 121 and the second arc-shaped portion 1411 are arc-shaped structures that bend outward in the same direction, they can form a fitting interface when combined, thereby improving the assembly accuracy and sealing performance of the battery casing 1.

[0088] Furthermore, compared with the planar fit or stepped overlap structure between the cover plate and the shell side plate in related technologies, the cover plate 141 and the second shell side plate 12 adopt an arc-shaped fitting structure, which realizes a natural and tight fit between the cover plate 141 and the second shell side plate 12. Since the second arc-shaped part 1411 and the first arc-shaped part 121 have matching arc curves, the structural fit can be achieved without introducing steps, straight reinforcement sections or sealing flanges, thereby saving the material used of the cover plate 141 and reducing manufacturing costs.

[0089] Furthermore, since the cover plate 141 and the second housing side plate 12 are fitted and engaged with each other through the second arc portion 1411 and the first arc portion 121, no extra connecting step or sealing flange needs to be provided in the battery housing 1, so that a more compact and smooth envelope contour is formed at the boundary of the battery housing 1, the space utilization rate inside the battery housing 1 is improved, the cell assembly 2 with a larger volume can be arranged in the accommodating cavity 10, and then the energy storage capacity and volume energy density of the cell assembly 2 are enhanced.

[0090] Further, the second arc portion 1411 includes a second inner arc wall 1411A and a second outer arc wall 1411B disposed opposite to each other along the second direction Y, and the following relationship is satisfied between the width of the cover plate 141 and the arc length of the second outer arc wall 1411B: b2<L2≤πb2; where b2 is the width of the cover plate 141, and L2 is the arc length of the second outer arc wall 1411B. By controlling the magnitude relationship between the width of the cover plate 141 and the arc length of the second outer arc wall 1411B, the spatial distribution inside the battery housing 1 is optimized, the arrangement of the cell assemblies 2 is made more compact, and the space utilization rate of the battery housing 1 is further improved.

[0091] It can be understood that by setting L2≤πb2, the situation that the arc length of the second outer arc wall 1411B is too large, which leads to a loose structure of the battery housing 1 and affects the mechanical strength of the battery housing 1, can be avoided; meanwhile, by setting b2<L2, the second outer arc wall 1411B has an appropriate radius of curvature, which provides necessary buffer space for the expansion of the cell assembly 2, prevents the battery housing 1 from imposing excessive constraint on the cell assembly 2, and reduces the risk of damage to the cell assembly 2.

[0092] Specifically, the thickness of the cover plate 141 is greater than or equal to 0.1 mm and less than or equal to 5 mm; the width of the cover plate 141 is greater than or equal to 5 mm and less than or equal to 150 mm. By controlling the width of the cover plate 141 to be greater than or equal to 5 mm, it is ensured that the cover plate 141 has sufficient bearing capacity and structural rigidity, the bending resistance and deformation resistance of the cover plate 141 are improved, and the structural reliability of the battery housing 1 during transportation, assembly and use is enhanced; at the same time, by setting the width of the cover plate 141 to be greater than or equal to 5 mm and less than or equal to 150 mm, the typical requirement range of cover plates from small energy storage modules to large power battery modules is covered, the universality and scalability of the battery housing 1 are enhanced, and the structural design requirements of various new energy vehicles or energy storage equipment are satisfied.

[0093] It should be noted that the cover plate 141 can be provided with a variety of conventional opening structures according to functional requirements, such as electrode post through holes for connecting the lead-out ends of the battery cells, QR code through holes for product traceability (where the QR code through holes can also be designed to be transparent for scanning and identification), explosion-proof valve through holes for safe pressure relief, and positive and negative polarity marking through holes for polarity identification, etc. These opening structures can be customized according to specific applications to meet the integrated needs of battery cell packaging, marking, safety and information reading.

[0094] In one embodiment, the cover plate assembly 14 further includes an insulating member 142, which is disposed between the cover plate 141 and the cell assembly 2. The insulating member 142 may be a plastic part, used to block the electrical path, prevent the risk of short circuit, and play a buffering and transition function.

[0095] The insulating member 142 includes a third arcuate portion 1421, which is bent outward along the second direction. Each third arcuate portion 1421 corresponds to a first arcuate portion 121, and the third arcuate portion 1421 matches its corresponding first arcuate portion 121, thereby enabling the insulating member 142 to maintain a tight fit with the first arcuate portion 121 on the second housing side plate 12, avoiding the risk of insulation failure due to structural misalignment or gaps.

[0096] Specifically, the shape of the third arc-shaped portion 1421 matches the shape of its corresponding first arc-shaped portion 121. Since both the first arc-shaped portion 121 and the third arc-shaped portion 1421 are arc-shaped structures that bend outward in the same direction, they can form a mutually fitting interface when combined, thereby improving the assembly accuracy and sealing performance of the battery casing 1.

[0097] Meanwhile, since the outer contour of the third arc-shaped portion 1421 matches the outer contour of the first arc-shaped portion 121, a natural fit between the two can be achieved without setting additional connecting transition portions or supporting flanges, thereby avoiding material redundancy and waste caused by the mismatch between the shape of the plastic parts and the side plate of the housing in related technologies, and reducing the manufacturing cost of the battery housing 1.

[0098] In addition, since the insulating member 142 and the second housing side plate 12 are fitted and engaged with each other through the third arc portion 1421 and the first arc portion 121, no extra connecting step or sealing flange needs to be provided in the battery housing 1, so that a more compact and smooth envelope profile is formed at the boundary of the battery housing 1, the space utilization rate inside the battery housing 1 is improved, the cell assembly 2 with a larger volume can be disposed in the accommodating cavity 10, and the energy storage capacity and the volume energy density of the cell assembly 2 are further improved.

[0099] Moreover, in the related art, the lower plastic member usually only provides a limited point-shaped or strip-shaped supporting area at the top of the cell, which has poor supporting stability, and easily causes the wound core to shift, deform, or even have local structural failure when subjected to external impact or transportation vibration; in contrast, in this embodiment, by providing the third arc portion 1421 in the insulating member 142, the insulating member 142 is more closely fitted to the contour of the top of the cell assembly 2, thereby increasing the contact area between the insulating member 142 and the cell assembly 2. The insulating member 142 can provide uniform surface support for the cell assembly 2 in multiple directions, enhance the positioning stability and structural constraint force of the cell assembly 2 in the battery housing 1, and further improve the seismic performance and mechanical strength of the battery housing 1.

[0100] Further, the third arc portion 1421 includes a third inner arc wall 1421A and a third outer arc wall 1421B disposed opposite to each other along the second direction, and a relationship between the width of the insulating member 142 and the arc length of the third outer arc wall 1421B satisfies: b3<L3≤πb3; where b3 is the width of the insulating member 142, and L3 is the arc length of the third outer arc wall 1421B. By controlling the magnitude relationship between the width of the insulating member 142 and the arc length of the third outer arc wall 1421B, the spatial distribution inside the battery housing 1 is optimized, the arrangement of the cell assemblies 2 is more compact, and the space utilization rate of the battery housing 1 is further improved.

[0101] Specifically, the thickness of the insulating component 142 is greater than or equal to 3 mm and less than or equal to 20 mm; the width of the insulating component 142 is greater than or equal to 5 mm and less than or equal to 150 mm. By controlling the width of the insulating component 142 to be greater than or equal to 5 mm, it is ensured that the insulating component 142 has sufficient load-bearing capacity and structural rigidity, thereby improving the bending and deformation resistance of the insulating component 142 and enhancing the structural reliability of the battery housing 1 during transportation, assembly, and use. At the same time, by setting the width of the insulating component 142 to be greater than or equal to 5 mm and less than or equal to 150 mm, it is avoided that the size of the insulating component 142 is too large, which would lead to increased mold complexity, increased material waste, and excessive occupation of internal space, thereby ensuring the compactness of the internal structure of the battery housing 1.

[0102] Please continue, please combine Figures 1 to 9 This embodiment also provides a battery 3, including a cell assembly 2, a base plate 31, a protective film (not shown in the figure), and the battery casing 1 described in any of the above embodiments.

[0103] The battery housing 1 has a receiving cavity 10; the battery cell assembly 2 is installed in the receiving cavity 10; the protective film is located in the receiving cavity 10 and covers the outer surface of the battery cell assembly 2; the bottom support plate 31 is disposed between the battery housing 1 and the battery cell assembly 2, and the bottom support plate 31 is used to fix the position of the battery cell assembly 2, and at the same time plays the role of insulation and heat dissipation.

[0104] Furthermore, the bottom support plate 31 is disposed between the base plate 13 and the battery cell assembly 2. The bottom support plate 31 is adapted to fix the position of the battery cell assembly 2. The bottom support plate 31 includes a fourth arc-shaped portion 311, which is curved outward along the second direction toward the base plate 13. Each fourth arc-shaped portion 311 corresponds to a first arc-shaped portion 121, and the outer contour of the fourth arc-shaped portion 311 matches the outer contour of the first arc-shaped portion 121, so that the bottom support plate 31 can fit tightly against the bottom of the battery cell assembly 2.

[0105] Specifically, the fourth arc-shaped portion 311 is correspondingly disposed at the bottom of the battery cell assembly 2, thereby achieving one-to-one precise support while dispersing the load on the battery cell assembly 2, improving the structural stability of the battery cell assembly 2 in multiple directions, thereby enhancing the fixing effect of the battery cell assembly 2 in the battery housing 1, and further improving the assembly reliability and shock resistance of the battery housing 1.

[0106] Meanwhile, by adopting this local arc-shaped structure supporting manner, redundant design of large-area solid support can be avoided while ensuring structural strength, thereby contributing to reducing material consumption and lowering cost. In addition, as the bottom support sheet 31 has higher spatial adaptability, the optimized structural arrangement thereof results in a smaller gap between the cell assemblies 2, which helps to improve the overall compactness of cell arrangement, further increase the space utilization rate inside the battery housing 1, so as to increase the total capacity of the cells accommodated per unit volume, that is, increase the volume energy density of the cells, and thereby enhance the performance of the entire battery pack.

[0107] Meanwhile, since the outer contour of the fourth arc portion 311 matches the outer contour of the first arc portion 121, that is, the two achieve contour coordination in structural form, a precise fitting relationship can be formed between the bottom support sheet 31 and the battery housing 1. While the bottom support sheet 31 effectively supports the cell assemblies 2, structural reinforcement can be performed only in necessary contact areas, and a whole solid structure is not required to fill the entire bottom space, so as to reduce the material consumption of the bottom support sheet 31 and lower the manufacturing cost of the battery 3.

[0108] In addition, since the bottom support sheet 31 and the second housing side plate 12 are in chimeric fit with each other through the fourth arc portion 311 and the first arc portion 121, the assembly stability and structural strength between the bottom support sheet 31 and the battery housing 1 are improved, and the gap space that needs to be reserved due to shape mismatch between the two components is reduced, thereby increasing the space utilization rate inside the battery housing 1, allowing the cell assemblies 2 with a larger volume to be disposed in the accommodating cavity 10, and further improving the energy storage capacity and volume energy density of the cell assemblies 2.

[0109] Further, the fourth arc portion 311 includes a fourth inner arc wall 311A and a fourth outer arc wall 311B disposed opposite to each other along the second direction. The relationship between the width of the bottom support sheet 31 and the arc length of the fourth outer arc wall 311B satisfies: b4<L4≤πb4; where b4 is the width of the bottom support sheet 31, and L4 is the arc length of the fourth outer arc wall 311B. By controlling the magnitude relationship between the width of the bottom support sheet 31 and the arc length of the fourth outer arc wall 311B, the spatial distribution inside the battery housing 1 is improved, the arrangement of the cell assemblies 2 is more compact, and the space utilization rate of the battery housing 1 is further increased.

[0110] Specifically, the thickness of the base plate 31 is greater than or equal to 0.1 mm and less than or equal to 3 mm; the width of the base plate 31 is greater than or equal to 5 mm and less than or equal to 150 mm. By controlling the width of the base plate 31 to be greater than or equal to 5 mm, it is ensured that the base plate 31 has sufficient load-bearing capacity and structural rigidity, thereby improving the bending and deformation resistance of the base plate 31 and enhancing the structural reliability of the battery casing 1 during transportation, assembly, and use. At the same time, by setting the width of the base plate 31 to be greater than or equal to 5 mm and less than or equal to 150 mm, it is avoided that the size of the base plate 31 is too large, which would lead to increased mold complexity, increased material waste, and excessive occupation of internal space, thereby ensuring the compactness of the internal structure of the battery casing 1.

[0111] Furthermore, the base plate 31 is provided with multiple permeation holes 312 to realize the permeation and discharge of liquids or gases, thereby effectively guiding the discharge of excess colloids, bubbles or cooling media during processes such as glue injection, potting or thermal management, and avoiding problems such as abnormal internal pressure or uneven heat conduction of the battery casing 1 due to the accumulation of residues.

[0112] Specifically, the pore diameter of the permeation hole 312 is greater than 0 and less than 20 mm. The permeation hole 312 can reduce the weight of the base plate 31, reduce the amount of material used, and improve the lightweight level of the base plate 31 without affecting the support strength, thereby further optimizing the mass energy density of the battery 3.

[0113] It is understood that the battery casing 1 has been described in detail in the above embodiments and will not be repeated here; in particular, since the battery 3 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be elaborated here.

[0114] It should be noted that the type of battery 3 can be flexibly selected according to the needs of the actual application scenario, and the battery can be adapted to a variety of electrical devices. Specifically, since the battery provided in this embodiment has the characteristics of stable structure and high assembly precision, it can meet the differentiated battery performance requirements of different electrical devices. Therefore, the electrical devices can include, but are not limited to, at least one of vehicles, energy storage power supplies, consumer electronics, medical devices, or smart city devices. In this embodiment, the specific type of electrical device is not limited, and can be adapted and selected according to the actual application scenario.

[0115] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery casing (1) having a receiving cavity (10), characterized in that, include: Two first housing side plates (11) are arranged opposite each other along a first direction, which intersects the height direction of the battery housing (1); as well as At least one second housing side plate (12) is disposed along a second direction, the second direction intersecting the virtual plane containing the height direction of the battery housing (1) and the first direction. The second housing side plate (12) includes a plurality of first arcuate portions (121), the first arcuate portions (121) being curved toward the outside of the second housing side plate (12) along the second direction. Furthermore, one of the first housing side plates (11) is connected to another first housing side plate (11) through a plurality of first arcuate portions (121) such that the two first housing side plates (11) and the plurality of first arcuate portions (121) surround the receiving cavity (10), the receiving cavity (10) being adapted to receive a plurality of battery cell assemblies (2).

2. The battery casing (1) according to claim 1, characterized in that, The second housing side plate (12) includes two of the first arcuate portions (121); The receiving cavity (10) includes two receiving sub-cavities (10A), which are adapted to receive the battery cell assembly (2); In this configuration, one of the first housing side plates (11) is connected to another first housing side plate (11) in sequence via two first arc-shaped portions (121), such that each first housing side plate (11) and the corresponding first arc-shaped portion (121) surround the corresponding receiving sub-cavity (10A).

3. The battery casing (1) according to claim 2, characterized in that, The first housing side plate (11) is a straight plate; and / or, the area of ​​the outer side of the first housing side plate (11) is greater than the area of ​​the outer side of the second housing side plate (12); and / or, the outer sides of the two first arcuate portions (121) are continuously arranged.

4. The battery casing (1) according to claim 1, characterized in that, The first arc-shaped portion (121) includes a first inner arc wall (1211) and a first outer arc wall (1212) disposed opposite to each other along the second direction. The radius of the circle containing the first outer arc wall (1212) and the thickness of the battery cell assembly (2) satisfy the following relationship: R = k·d; Where R is the radius of the circle containing the first outer arc wall (1212), d is the thickness of the battery cell assembly (2) in the first charged state, k is a real number, and k is greater than or equal to 0.95 and less than or equal to 1.

2.

5. The battery casing (1) according to claim 4, characterized in that, The first state of charge is greater than 0 and less than or equal to 10%, and k is greater than or equal to 1.05 and less than or equal to 1.2; Alternatively, the first state of charge is greater than 10% and less than or equal to 50%, and k is greater than or equal to 1 and less than or equal to 1.12; Alternatively, the first state of charge is greater than 50% and less than or equal to 100%, and k is greater than or equal to 0.95 and less than or equal to 1.

12.

6. The battery casing (1) according to claim 4, characterized in that, The battery casing (1) further includes a base plate (13), and two first casing side plates (11) and two second casing side plates (12) are arranged around the edge of the base plate (13). The width of the base plate (13) and the arc length of the first outer arc wall (1212) satisfy the following condition: b1 <L1≤πb1; Wherein, b1 is the width of the base plate (13), and L1 is the arc length of the first outer arc wall (1212).

7. The battery casing (1) according to claim 6, characterized in that, The width of the base plate (13) is greater than or equal to 5 mm and less than or equal to 100 mm.

8. The battery casing (1) according to claim 6, characterized in that, The ratio of the thickness of the bottom plate (13) to the thickness of the first shell side plate (11) is greater than or equal to 2 and less than or equal to 20. And / or, the ratio of the thickness of the base plate (13) to the thickness of the first arcuate portion (121) is greater than or equal to 0.5 and less than or equal to 10; And / or, the ratio of the thickness of the first housing side plate (11) to the thickness of the first arcuate portion (121) is greater than or equal to 0.083 and less than or equal to 5.

9. The battery casing (1) according to claim 8, characterized in that, The thickness of the base plate (13) is greater than or equal to 0.6 mm and less than or equal to 2 mm; and / or, the thickness of the first housing side plate (11) is greater than or equal to 0.1 mm and less than or equal to 1 mm; and / or, the thickness of the first arcuate portion (121) is greater than or equal to 0.2 mm and less than or equal to 1.2 mm.

10. The battery casing (1) according to any one of claims 1 to 9, characterized in that, The sidewall of the first arc-shaped portion (121) has an arc-shaped cross section along the thickness direction of the battery housing (1) and is curved in a direction away from the receiving cavity (10).

11. The battery casing (1) according to any one of claims 1 to 9, characterized in that, The battery housing (1) further includes a cover plate assembly (14) adapted to seal the receiving cavity (10). The cover plate assembly (14) includes a cover plate (141) including a plurality of second arcuate portions (1411) which are curved toward the outside of the cover plate (141) along the second direction. In this configuration, a second arc-shaped portion (1411) is provided corresponding to a first arc-shaped portion (121), and the second arc-shaped portion (1411) matches its corresponding first arc-shaped portion (121).

12. The battery casing (1) according to claim 11, characterized in that, The second arcuate portion (1411) includes a second inner arcuate wall (1411A) and a second outer arcuate wall (1411B) disposed opposite each other along the second direction. The width of the cover plate (141) and the arc length of the second outer arcuate wall (1411B) satisfy the following condition: b2 <L2≤πb2; Wherein, b2 is the width of the cover plate (141), and L2 is the arc length of the second outer arc wall (1411B).

13. The battery casing (1) according to claim 11, characterized in that, The cover plate assembly (14) further includes an insulating member (142), which is disposed between the cover plate (141) and the cell assembly (2). The insulating member (142) includes a third arcuate portion (1421), which is bent outward along the second direction towards the outside of the insulating member (142). In this configuration, a third arc-shaped portion (1421) is provided corresponding to a first arc-shaped portion (121), and the third arc-shaped portion (1421) matches its corresponding first arc-shaped portion (121).

14. The battery casing (1) according to claim 13, characterized in that, The third arcuate portion (1421) includes a third inner arcuate wall (1421A) and a third outer arcuate wall (1421B) disposed opposite to each other along the second direction. The width of the insulating member (142) and the arc length of the third outer arcuate wall (1421B) satisfy the following relationship: b3 <L3≤πb3; Wherein, b3 is the width of the insulating element (142), and L3 is the arc length of the third outer arc wall (1421B).

15. A battery (3), characterized in that, Includes the battery casing (1) as described in any one of claims 1 to 14.

16. The battery (3) according to claim 15, characterized in that, The battery (3) includes a base plate (31) disposed between the base plate (13) and the cell assembly (2). The base plate (31) is used to fix the position of the cell assembly (2). The base plate (31) includes a fourth arc-shaped portion (311) which is bent toward the outside of the base plate (13) along the second direction. Each fourth arc-shaped portion (311) corresponds to a first arc-shaped portion (121).

17. The battery (3) according to claim 16, characterized in that, The fourth arcuate portion (311) includes a fourth inner arcuate wall (311A) and a fourth outer arcuate wall (311B) disposed opposite to each other along the second direction. The width of the base plate (31) and the arc length of the fourth outer arcuate wall (311B) satisfy the following relationship: b4 <L4≤πb4; Wherein, b4 is the width of the base plate (31), and L4 is the arc length of the fourth outer arc wall (311B).

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