Battery shell and battery

Abstract

The utility model provides a battery shell and a battery. The battery shell comprises two first side walls and two second side walls, the two first side walls are oppositely arranged along a first direction, the two second side walls are oppositely arranged along a second direction and are connected between the two first side walls, the volume of the second side walls is smaller than that of the first side walls, and an included angle is formed between the second direction and the first direction; a plurality of first cavities are formed in the first side wall, the volume of the first side wall is V1, the sum of the volumes of the plurality of first cavities is V2, and the ratio of the sum of the volumes of the plurality of first cavities to the volume of the first side wall is 0.3 < = V2 / V1 < = 0.7. According to the battery shell, the ratio of the sum of the volumes of the first cavities to the volume of the first side wall is set to be 0.3 < = V2 / V1 < = 0.7, so that the first side wall has buffering and heat-insulating capabilities, when the battery shell is put into use, buffering and heat-insulating materials such as aerogel do not need to be additionally arranged, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery casing and a battery. Background Art

[0002] With the rapid development of battery technology, the lightweight design and safety design of batteries have received widespread attention. In related technologies, the battery shell is generally made of industrial solid aluminum plate. During the subsequent use of the battery, the battery shell is very easy to be bumped or squeezed, resulting in damage to the appearance. In severe cases, it will directly cause the battery to be unusable. Therefore, when the battery shell is officially put into use, additional buffering and heat-insulating materials such as aerogel will be added between the battery shells of two adjacent batteries to improve safety. However, buffering and heat-insulating materials such as aerogel have high costs themselves, which will lead to higher overall production costs. Utility Model Content

[0003] The embodiments of the present application provide a battery housing and a battery, which can improve the technical problem that when the battery housing is put into use, additional buffer insulation materials need to be added, resulting in high production costs.

[0004] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0005] Two first side walls are arranged opposite to each other along a first direction;

[0006] Two second side walls are arranged opposite to each other along a second direction, the second side walls are connected between the two first side walls, the volume of the second side walls is smaller than the volume of the first side walls; the second direction forms an angle with the first direction;

[0007] Among them, multiple first cavities are formed in the first side wall, the volume of the first side wall is V1, the sum of the volumes of the multiple first cavities is V2, and the ratio of the sum of the volumes of the multiple first cavities to the volume of the first side wall satisfies the relationship: 0.3≤V2 / V1≤0.7.

[0008] In one embodiment, a plurality of second cavities are formed in the second side wall, the volume of the second side wall is V3, the sum of the volumes of the plurality of second cavities is V4, and the ratio of the sum of the volumes of the plurality of second cavities to the volume of the second side wall satisfies the relationship: 0.1≤V4 / V3≤0.5.

[0009] In one embodiment, a ratio of a sum of volumes of the plurality of first cavities to a volume of the first sidewall is greater than a ratio of a sum of volumes of the plurality of second cavities to a volume of the second sidewall.

[0010] In one embodiment, multiple second cavities are formed in the second sidewall, multiple second cavities are formed in the second sidewall, the volume of the second sidewall is V3, the sum of the volumes of the multiple second cavities is V4, and the volume of the first sidewall, the sum of the volumes of the multiple first cavities, the volume of the second sidewall and the sum of the volumes of the multiple second cavities satisfy the relationship: 0.1≤(V2+V4) / (V1+V3)≤0.7.

[0011] In one embodiment, the cross-section of the first cavity is a regular polygon, the first cavity extends along a third direction, and the third direction, the second direction and the first direction form an angle with each other; perpendicular to the third direction, the cross-section of the first cavity is a regular polygon, the side length of the cross-section of the first cavity is D1, the thickness of the first side wall in the first direction is T1, and the ratio of the thickness of the first side wall to the side length of the cross-section of the first cavity satisfies the relationship: 6≤T1 / D1≤11.

[0012] In one embodiment, the second cavity extends along a third direction, and the third direction, the second direction and the first direction form an angle with each other; perpendicular to the third direction, the cross-section of the second cavity is a regular polygon, the side length of the cross-section of the second cavity is D2, the thickness of the second side wall in the second direction is T2, and the ratio of the thickness of the second side wall to the side length of the cross-section of the second cavity satisfies the relationship: T2 / D2≥10.

[0013] In one embodiment, the two first side walls and the two second side walls enclose a accommodating cavity, the first side wall having an inner surface facing the accommodating cavity and an outer surface facing away from the accommodating cavity, and in a direction along the outer surface toward the inner surface, the sum of the volumes of the plurality of first cavities within a unit volume gradually decreases.

[0014] In one embodiment, in the first direction, the sum of the volumes of the plurality of second cavities within a unit volume gradually decreases from opposite sides of the second side wall toward a middle region.

[0015] In one embodiment, a plurality of the first cavities are evenly distributed in the first side wall; and / or,

[0016] A plurality of the second cavities are evenly distributed in the second side wall.

[0017] In a second aspect, an embodiment of the present application provides a battery, comprising:

[0018] The battery housing described in any one of the above items, wherein the two first side walls and the two second side walls of the battery housing enclose a receiving cavity, and the receiving cavity has a first end and a second end opposite to each other;

[0019] A battery cell is located in the accommodating cavity, and the battery cell includes a first electrode and a second electrode;

[0020] Two cover plates are respectively located at the first end and the second end of the accommodating cavity, the cover plate is connected to the battery housing, and a first pole and a second pole are formed on the cover plate. The first pole is electrically connected to the first electrode, and the second pole is electrically connected to the second electrode.

[0021] Beneficial effects of the embodiments of the present application:

[0022] In an embodiment of the present application, a plurality of first cavities are formed in the first side wall of the battery shell, and the ratio of the sum of the volumes of the plurality of first cavities to the volume of the first side wall is set to 0.3≤V2 / V1≤0.7, so that the first side wall itself has buffering and heat-insulating capabilities while still having good structural strength. When the battery shell is put into use, there is no need to additionally provide buffering and heat-insulating materials such as aerogel, which helps to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic diagram of a three-dimensional structure of a battery housing provided in an embodiment of the present application;

[0025] Figure 2 is a schematic cross-sectional structural diagram of a battery housing provided in an embodiment of the present application;

[0026] Figure 3 This is a method provided by the embodiments of the present application. Figure 2 Schematic diagram of the enlarged structure of the A area in the middle;

[0027] Figure 4 is a schematic cross-sectional structural diagram of another battery housing provided in an embodiment of the present application;

[0028] Figure 5 This is a method provided by the embodiments of the present application. Figure 4 Schematic diagram of the enlarged structure of the middle B area;

[0029] Figure 6 It is a schematic diagram of the structure of a battery provided in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 10. Battery;

[0032] 100, battery housing; 110, first side wall; 111, first cavity; 112, inner surface; 113, outer surface; 120, second side wall; 121, second cavity; 130, receiving cavity; 131, first end; 132, second end; X, first direction; Y, second direction; Z, third direction;

[0033] 200, battery cell; 210, first electrode; 220, second electrode;

[0034] 300, cover plate; 310, first pole; 320, second pole. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0036] The embodiments of the present application provide a battery housing and a battery, which are described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0037] First, the present application embodiment provides a battery housing, such as Figures 1 to 3 As shown, the battery housing 100 includes two first side walls 110 and two second side walls 120, the two first side walls 110 are arranged oppositely along the first direction X, the two second side walls 120 are arranged oppositely along the second direction Y, and the second side wall 120 is connected between the two first side walls 110, that is, the two first side walls 110 and the two second side walls 120 enclose a receiving cavity 130 with two ends open, and the receiving cavity 130 is used to place the battery cell 200. Among them, the volume of the second side wall 120 is smaller than the volume of the first side wall 110, that is, the first side wall 110 is a relatively wide side of the battery housing 100, and the second side wall 120 is a relatively narrow side of the battery housing 100. When the battery housing 100 is applied to the battery 10, if a plurality of batteries 10 are assembled into a module, the first side wall 110 is a side wall where two adjacent batteries 10 contact each other.

[0038] A plurality of first cavities 111 are formed in the first side wall 110. Since the first side wall 110 is a side wall where two adjacent batteries 10 contact each other, when the battery 10 expands or collides during operation, the first side walls 110 of the two adjacent batteries 10 will be squeezed against each other. By forming the first cavity 111 in the first side wall 110, it is helpful to improve the compressible deformation capacity of the first side wall 110, so that the first side wall 110 itself has a certain buffering performance; at the same time, the provision of the first cavity 111 can also reduce the overall thermal conductivity of the first side wall 110, reduce the mutual conduction of heat generated during the operation of the two adjacent batteries 10, so that the first side wall 110 itself also has a certain heat insulation performance; in addition, since the first side wall 110 has the ability of buffering and heat insulation, when the battery 10 having the battery housing 100 is assembled into a module, there is no need to place aerogel and other buffering and heat-insulating materials between adjacent batteries 10, thereby effectively reducing the production cost.

[0039] The entire volume of the first sidewall 110 is defined as V1, and the sum of the volumes of the first cavities 111 is defined as V2. The ratio of the sum of the volumes of the first cavities 111 to the volume of the first sidewall 110 satisfies the relationship: 0.3≤V2 / V1≤0.7.

[0040] If the ratio is too small, the first cavity 111 will occupy a relatively small proportion in the first side wall 110, which cannot meet the buffering and heat insulation performance requirements of the first side wall 110; if the ratio is too large, the first cavity 111 will occupy a relatively large proportion in the first side wall 110, which will seriously weaken the structural strength of the first side wall 110, thereby affecting the structural stability of the battery housing 100 during use. The present application sets the ratio of the sum of the volumes of the plurality of first cavities 111 to the volume of the first side wall 110 to 0.3≤V2 / V1≤0.7, so that the first side wall 110 can still have good structural strength while ensuring that the first side wall 110 meets the use requirements of heat insulation and buffering, thereby ensuring the normal use of the battery housing 100.

[0041] It should be noted that in the actual manufacturing process, the ratio of the sum of the volumes of the multiple first cavities 111 to the volume of the first side wall 110 can be set to 0.3, 0.4, 0.5, 0.6 or 0.7, etc. The specific ratio can be selected and adjusted according to actual design requirements, and there is no special restriction here.

[0042] Optional, such as Figure 4 and Figure 5As shown, in addition to forming the first cavity 111 in the first side wall 110, a plurality of second cavities 121 can also be formed in the second side wall 120. Although the second side wall 120 is a relatively narrow side of the battery case 100 and is not the main extrusion surface, when the first side wall 110 is extruded and deformed, the extrusion force exerted on the first side wall 110 will be partially transmitted to the second side wall 120. By forming the second cavity 121 in the second side wall 120, the overall buffering and heat insulation performance of the battery case 100 can be further improved.

[0043] The entire volume of the second sidewall 120 is defined as V3, and the sum of the volumes of the second cavities 121 is defined as V4. The ratio of the sum of the volumes of the second cavities 121 to the volume of the second sidewall 120 satisfies the relationship: 0.1≤V4 / V3≤0.5.

[0044] If the ratio is too small, the second cavity 121 will account for a small proportion of the second side wall 120, which cannot meet the buffering and heat insulation performance requirements of the second side wall 120; if the ratio is too large, the second cavity 121 will account for a large proportion of the second side wall 120, resulting in a weak structural strength of the second side wall 120, which in turn affects the structural stability of the battery housing 100 during use. By setting the ratio of the sum of the volumes of the plurality of second cavities 121 to the volume of the second side wall 120 to 0.1≤V4 / V3≤0.5, while ensuring that the second side wall 120 meets the use requirements of heat insulation and buffering, the second side wall 120 can still have a good structural strength, ensuring the normal use of the battery housing 100.

[0045] It should be noted that in the actual manufacturing process, the ratio of the sum of the volumes of the multiple second cavities 121 to the volume of the second side wall 120 can be set to 0.1, 0.2, 0.3, 0.4 or 0.5, etc. The specific ratio can be selected and adjusted according to actual design requirements, and no special restrictions are made here.

[0046] In some embodiments, since the first side wall 110 is the side wall that is mainly squeezed during the use of the battery case 100, when the first cavity 111 is formed in the first side wall 110, its buffering and heat-insulating properties are mainly utilized, and its own structural strength is secondary. When the second cavity 121 is formed in the second side wall 120, its structural strength is mainly utilized, and the buffering and heat-insulating properties are secondary. That is, when the first cavity 111 is formed in the first side wall 110 and the second cavity 121 is formed in the second side wall 120 at the same time, the ratio (V2 / V1) of the sum of the volumes of the multiple first cavities 111 to the volume of the first side wall 110 can be set to be greater than the ratio (V4 / V3) of the sum of the volumes of the multiple second cavities 121 to the volume of the second side wall 120, so that the battery case 100 as a whole can simultaneously meet the performance requirements of buffering and heat insulation and the use requirements of structural strength.

[0047] It should be noted that since the first side wall 110 and the second side wall 120 are relatively thin, in order to ensure that the battery housing 100 as a whole has a strong structural strength, the second side wall 120 can also be directly set as a solid structure. The specific structural design method can be selected and adjusted according to actual design requirements, and no special restrictions are made here.

[0048] In other embodiments, when a first cavity 111 is formed in the first side wall 110 and a second cavity 121 is formed in the second side wall 120, the first side wall 110 and the second side wall 120 can be taken as a whole to limit the sum of the volume proportions of the first cavity 111 and the second cavity 121, so that the battery casing 100 as a whole can simultaneously meet the performance requirements of buffering and heat insulation and the use requirements of structural strength. In this embodiment, the volume of the first side wall 110, the sum of the volumes of the plurality of first cavities 111, the volume of the second side wall 120 and the sum of the volumes of the plurality of second cavities 121 satisfy the relationship: 0.1≤(V2+V4) / (V1+V3)≤0.7, wherein the volume proportion of the first cavity 111 in the first side wall 110 and the volume proportion of the second cavity 121 in the second side wall 120 can be adjusted according to actual performance requirements, and no special restrictions are made here, and it is only necessary to ensure that the above relationship is satisfied as a whole.

[0049] Specifically, in the actual production process, the specific ratio of (V2+V4) / (V1+V3) can be set to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 or 0.7, etc. The specific value can be selected according to actual design requirements, and there is no special restriction here.

[0050] Optional, such as Figure 1 and Figure 3 As shown, the first cavity 111 extends along the third direction Z, and the third direction Z, the second direction Y and the first direction X form an angle with each other. For example, the third direction Z, the second direction Y and the first direction X can be perpendicular to each other, that is, the first cavity 111 extends along the extension direction of the accommodating cavity 130 formed by the first side wall 110 and the second side wall 120, and passes through the opposite sides of the first side wall 110.

[0051] When the cross section of the first side wall 110 is cut perpendicular to the third direction Z, the obtained cross section is an opening formed by a plurality of first cavities 111 formed on the first side wall 110, wherein the cross section of the first cavity 111 is a regular polygon, the side length of the cross section of the first cavity 111 is D1, the thickness of the first side wall 110 in the first direction X is T1, and the ratio of the thickness of the first side wall 110 to the side length of the cross section of the first cavity 111 satisfies the relationship: 6≤T1 / D1≤11. The thickness T1 of the first side wall 110 is a fixed value, and the smaller T1 / D1 is, the larger D1 is, and the larger the cross-sectional area of ​​the first cavity 111 is, which helps to improve the buffering and heat insulation performance of the first side wall 110; the larger T1 / D1 is, the smaller D1 is, and the smaller the cross-sectional area of ​​the first cavity 111 is, which helps to ensure the structural strength of the first side wall 110 itself. In this embodiment, by setting the ratio of the thickness of the first side wall 110 to the cross-sectional side length of the first cavity 111 to 6≤T1 / D1≤11, it is helpful for the first side wall 110 to meet both the performance requirements of buffering and heat insulation and the use requirements of structural strength.

[0052] Specifically, in the actual manufacturing process, the ratio of the thickness of the first side wall 110 to the cross-sectional side length of the first cavity 111 can be set to 6, 7, 8, 9, 10 or 11, etc. The specific ratio can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0053] In some embodiments, Figure 1 and Figure 5 As shown, the second cavity 121 extends along the third direction Z, and the third direction Z, the second direction Y and the first direction X form an angle with each other. For example, the third direction Z, the second direction Y and the first direction X can be perpendicular to each other, that is, the second cavity 121 can also extend along the extension direction of the accommodating cavity 130 formed by the first side wall 110 and the second side wall 120, and pass through the opposite sides of the second side wall 120.

[0054] When the cross section of the second side wall 120 is cut perpendicular to the third direction Z, the obtained cross section is an opening formed by a plurality of second cavities 121 formed on the second side wall 120, wherein the cross section of the second cavity 121 is a regular polygon, the side length of the cross section of the second cavity 121 is D2, the thickness of the second side wall 120 in the second direction Y is T2, and the ratio of the thickness of the second side wall 120 to the side length of the cross section of the second cavity 121 satisfies the relationship: T2 / D2≥10. The thickness T2 of the second side wall 120 is a fixed value, and the smaller T2 / D2 is, the larger D2 is, and the larger the cross-sectional area of ​​the second cavity 121 is, which helps to improve the buffering and heat insulation performance of the second side wall 120; the larger T2 / D2 is, the smaller D2 is, and the smaller the cross-sectional area of ​​the second cavity 121 is, which helps to ensure the structural strength of the second side wall 120 itself. In this embodiment, by setting the ratio of the thickness of the second side wall 120 to the side length of the cross section of the second cavity 121 to T2 / D2 ≥ 10, it is helpful to ensure that the second side wall 120 has sufficient structural strength.

[0055] Specifically, in the actual manufacturing process, the ratio of the thickness of the second side wall 120 to the cross-sectional side length of the second cavity 121 can be set to 10, 12, 14, 16, 18 or 20, etc. The specific ratio can be selected and adjusted according to actual design requirements, and there is no special limitation here.

[0056] Among them, when the second side wall 120 is a solid structure, the cross-sectional side length D2 of the second cavity 121 is 0, then T2 / D2 tends to infinity, which is also within the protection scope of this embodiment. At this time, the second side wall 120 mainly plays a role in ensuring the overall structural strength of the battery housing 100.

[0057] It should be noted that the cross-section of the first cavity 111 and / or the second cavity 121 can also be other regular or irregular shapes. When it is an irregular shape, the side length of its cross-section cannot be defined. In this case, it can be defined by referring to the volume method in the above embodiment. When the cross-section of the first cavity 111 and / or the second cavity 121 is circular, the above D1 and D2 represent the radius of the cross-section of the first cavity 111 and the second cavity 121, respectively.

[0058] Optionally, in some embodiments, the two first side walls 110 and the two second side walls 120 enclose a accommodating cavity 130, and the first side wall 110 has an inner surface 112 facing the accommodating cavity 130 and an outer surface 113 facing away from the accommodating cavity 130. In the direction along the outer surface 113 toward the inner surface 112, the sum of the volumes of the multiple first cavities 111 within the unit volume gradually decreases, that is, in the direction from the outside to the inside of the first side wall 110, the proportion of the first cavity 111 within the unit volume gradually decreases.

[0059] When the first side wall 110 is squeezed during the use of the battery housing 100, the squeezing force on the first side wall 110 is gradually transmitted from the outer surface 113 of the first side wall 110 to the inner surface 112 of the first side wall 110. By setting the proportion of the first cavity 111 near the outer surface 113 of the first side wall 110 to be relatively large, it is helpful for the first side wall 110 to respond quickly and buffer deformation when squeezed. By setting the proportion of the first cavity 111 near the inner surface 112 of the first side wall 110 to be relatively small, the first side wall 110 can have a certain structural strength, thereby preventing the first side wall 110 from being damaged due to excessive deformation, thereby affecting the normal use of the battery housing 100.

[0060] Among them, when the volume of a single first cavity 111 within a unit volume is the same in the direction along the outer surface 113 toward the inner surface 112, the number of multiple first cavities 111 within the unit volume gradually decreases; when the number of multiple first cavities 111 within a unit volume is the same in the direction along the outer surface 113 toward the inner surface 112, the volume of a single first cavity 111 within the unit volume gradually decreases.

[0061] In other embodiments, in the first direction X, the sum of the volumes of the plurality of second cavities 121 within a unit volume gradually decreases from the opposite sides of the second side wall 120 to the middle area, that is, in the distribution direction of the two first side walls 110, the proportion of the second cavities 121 within a unit volume within the second side wall 120 gradually decreases from the opposite sides of the second side wall 120 to the middle area.

[0062] When the first side wall 110 is squeezed during the use of the battery case 100, the squeezing force exerted on the first side wall 110 is transmitted from the opposite sides of the second side wall 120 to the middle area when it is transmitted to the second side wall 120. By setting the proportion of the second cavity 121 near the two side areas of the second side wall 120 to be relatively large, it is helpful for the second side wall 120 to be able to buffer and deform when receiving the squeezing force. By setting the proportion of the second cavity 121 near the middle area of ​​the second side wall 120 to be relatively small, the second side wall 120 can have a certain structural strength, thereby preventing the second side wall 120 from being damaged due to excessive deformation, thereby affecting the normal use of the battery case 100.

[0063] Similarly, when the volume of a single second cavity 121 within a unit volume is the same in the direction toward the middle area along the opposite sides of the second side wall 120, the number of the multiple second cavities 121 within the unit volume gradually decreases; when the number of the multiple second cavities 121 within the unit volume is the same in the direction toward the middle area along the opposite sides of the second side wall 120, the volume of a single second cavity 121 within the unit volume gradually decreases.

[0064] In some other embodiments, multiple first cavities 111 are evenly distributed in the first side wall 110, and / or multiple second cavities 121 are evenly distributed in the second side wall 120, that is, the volume and number of the first cavities 111 are evenly distributed in the first side wall 110, and the volume and number of the second cavities 121 are evenly distributed in the second side wall 120. This distribution method can make the stress deformation and heat conduction of the battery case 100 more uniform during use, and at the same time help to simplify the manufacturing process of the battery case 100 and reduce the manufacturing cost.

[0065] It should be noted that the specific distribution of the first cavities 111 in the first side wall 110 and the specific distribution of the second cavities 121 in the second side wall 120 can be designed and adjusted according to actual use requirements, and are not particularly limited here.

[0066] Secondly, an embodiment of the present application provides a battery, which includes a battery shell. The specific structure of the battery shell refers to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0067] like Figure 6 As shown, the battery 10 includes a battery case 100, a battery cell 200 and two cover plates 300. The two first side walls 110 and the two second side walls 120 in the battery case 100 enclose a receiving cavity 130. The receiving cavity 130 has a first end 131 and a second end 132 opposite to each other. The battery cell 200 is located in the receiving cavity 130. The battery cell 200 includes a first electrode 210 and a second electrode 220. The two cover plates 300 are respectively located at the first end 131 and the second end 132 of the receiving cavity 130. The cover plate 300 is connected to the battery case 100. A first pole 310 and a second pole 320 are formed on the cover plate 300. The first pole 310 is electrically connected to the first electrode 210, and the second pole 320 is electrically connected to the second electrode 220.

[0068] Among them, the first pole 310 and the second pole 320 can be respectively arranged on the two cover plates 300, that is, the first pole 310 and the second pole 320 are respectively located at the first end 131 and the second end 132 of the accommodating cavity 130, so as to facilitate the series-parallel design between multiple batteries 10 when multiple batteries 10 are assembled into a module.

[0069] It should be noted that the first pole 310 and the second pole 320 can also be simultaneously arranged on one of the cover plates 300, that is, the first pole 310 and the second pole 320 are located at the same end of the battery cell 200. The specific arrangement method can be selected and adjusted according to the actual design requirements of the battery 10, and no special restrictions are made here.

[0070] Specifically, Figures 1 to 5 As shown, the battery case 100 in the embodiment of the present application includes two first side walls 110 and two second side walls 120, the two first side walls 110 are arranged opposite to each other along the first direction X, the two second side walls 120 are arranged opposite to each other along the second direction Y and are connected between the two first side walls 110, the volume of the second side wall 120 is smaller than the volume of the first side wall 110, a plurality of first cavities 111 are formed in the first side wall 110, the volume of the first side wall 110 is V1, the sum of the volumes of the plurality of first cavities 111 is V2, and the ratio of the sum of the volumes of the plurality of first cavities 111 to the volume of the first side wall 110 is: 0.3≤V2 / V1≤0.7. By setting the ratio of the sum of the volumes of the multiple first cavities 111 to the volume of the first side wall 110 to 0.3≤V2 / V1≤0.7, the first side wall 110 itself has buffering and heat-insulating capabilities while still having a certain structural strength. When the battery housing 100 is put into use, there is no need to add additional buffering and heat-insulating materials such as aerogel, which helps to reduce production costs. In addition, the setting of this ratio can also ensure that there is sufficient welding area between the battery housing 100 and the cover plate 300 to ensure the welding effect between the cover plate 300 and the battery housing 100.

[0071] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery housing, characterized in that: include: Two first side walls are arranged opposite to each other along a first direction; Two second side walls are arranged opposite to each other along a second direction, the second side walls are connected between the two first side walls, the volume of the second side walls is smaller than the volume of the first side walls; the second direction forms an angle with the first direction; Among them, multiple first cavities are formed in the first side wall, the volume of the first side wall is V1, the sum of the volumes of the multiple first cavities is V2, and the ratio of the sum of the volumes of the multiple first cavities to the volume of the first side wall satisfies the relationship: 0.3≤V2 / V1≤0.

7.

2. The battery housing according to claim 1, characterized in that: A plurality of second cavities are formed in the second side wall, the volume of the second side wall is V3, the sum of the volumes of the plurality of second cavities is V4, and the ratio of the sum of the volumes of the plurality of second cavities to the volume of the second side wall satisfies the relationship: 0.1≤V4 / V3≤0.

5.

3. The battery housing according to claim 2, characterized in that: A ratio of a sum of volumes of the plurality of first cavities to a volume of the first sidewall is greater than a ratio of a sum of volumes of the plurality of second cavities to a volume of the second sidewall.

4. The battery housing according to claim 1, characterized in that: A plurality of second cavities are formed in the second side wall, the volume of the second side wall is V3, the sum of the volumes of the plurality of second cavities is V4, and the volume of the first side wall, the sum of the volumes of the plurality of first cavities, the volume of the second side wall and the sum of the volumes of the plurality of second cavities satisfy the relationship: 0.1≤(V2+V4) / (V1+V3)≤0.

7.

5. The battery housing according to claim 1, characterized in that: The first cavity extends along a third direction, and the third direction, the second direction and the first direction form an angle with each other; perpendicular to the third direction, the cross-section of the first cavity is a regular polygon, the side length of the cross-section of the first cavity is D1, the thickness of the first side wall in the first direction is T1, and the ratio of the thickness of the first side wall to the side length of the cross-section of the first cavity satisfies the relationship: 6≤T1 / D1≤11.

6. The battery casing according to claim 2, characterized in that: The second cavity extends along a third direction, and the third direction, the second direction and the first direction form an angle with each other; perpendicular to the third direction, the cross-section of the second cavity is a regular polygon, the side length of the cross-section of the second cavity is D2, the thickness of the second side wall in the second direction is T2, and the ratio of the thickness of the second side wall to the side length of the cross-section of the second cavity satisfies the relationship: T2 / D2≥10.

7. The battery casing according to any one of claims 1 to 6, characterized in that: The two first side walls and the two second side walls enclose a accommodating cavity, the first side wall has an inner surface facing the accommodating cavity and an outer surface facing away from the accommodating cavity, and in the direction along the outer surface toward the inner surface, the sum of the volumes of the multiple first cavities within a unit volume gradually decreases.

8. The battery casing according to any one of claims 2 to 4 or 6, characterized in that: In the first direction, the sum of the volumes of the plurality of second cavities within a unit volume gradually decreases from opposite sides of the second side wall toward the middle region.

9. The battery casing according to any one of claims 2 to 4 or 6, characterized in that: A plurality of the first cavities are evenly distributed in the first side wall; and / or, A plurality of the second cavities are evenly distributed in the second side wall.

10. A battery, characterized in that: include: The battery housing according to any one of claims 1 to 9, wherein the two first side walls and the two second side walls of the battery housing enclose a receiving cavity, and the receiving cavity has a first end and a second end opposite to each other; A battery cell is located in the accommodating cavity, and the battery cell includes a first electrode and a second electrode; Two cover plates are respectively located at the first end and the second end of the accommodating cavity, the cover plate is connected to the battery housing, and a first pole and a second pole are formed on the cover plate. The first pole is electrically connected to the first electrode, and the second pole is electrically connected to the second electrode.

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