Battery cylinder, battery bottom cover and battery shell

Abstract

The utility model belongs to the field of primary battery boxes for single batteries or battery packs, and particularly relates to a battery barrel, a battery bottom cover and a battery shell. In order to solve the technical problem in the prior art that the density of the battery shell is the same everywhere, so under the premise of ensuring that the battery shell has a certain structural strength, the weight of the battery shell is heavy, resulting in a low weight energy density of the battery, the utility model proposes a battery barrel, a battery bottom cover and a battery shell, which adopt two materials with different strengths and ensure that the thickness of the part with greater material strength and the part with less material strength meet the following conditions: the weight of the part with greater material strength per unit area is less than the weight of the part with less material strength per unit area, thereby reducing the weight of the corresponding battery barrel, battery bottom cover and battery shell, and improving the weight energy density of the battery.

Description

Technical Field

[0001] The utility model belongs to the field of primary battery boxes of single batteries or battery packs, and particularly relates to a battery cylinder, a battery bottom cover and a battery shell. Background Art

[0002] In the prior art, the weight energy density of a battery is a very important indicator. For example, in a new energy electric vehicle, under the premise that the total storage capacity of the battery is certain, the higher the weight energy density of the battery, the lighter the new energy electric vehicle, and the correspondingly longer the endurance of the new energy electric vehicle.

[0003] In the prior art, the battery shell is often made of a single-density material. For example, a Chinese utility model patent with an authorization announcement number of CN220830024U and an authorization announcement date of 2024.04.23 discloses a battery shell, which includes a shell side wall (i.e., a battery cylinder, hereinafter referred to as a battery cylinder) and a bottom cover welded to one end of the battery cylinder. The battery cylinder is stamped or cold-extruded from sheet metal. Specifically, the battery cylinder can be made of conductive materials such as stainless steel or aluminum. The specific reason why the battery cylinder is made of conductive material is that the battery cylinder needs to be electrically connected to the negative electrode tab of the battery (specifically, it can be electrically connected to the negative electrode tab of the battery through the bottom cover) to prevent the battery cylinder from being corroded.

[0004] However, in the above-mentioned battery case, since the density of the battery case is the same everywhere, the weight of the battery case is heavy while ensuring that the battery case has a certain structural strength, resulting in a low weight energy density of the battery. Utility Model Content

[0005] The utility model aims to provide a battery cylinder to solve the technical problem in the prior art that, because the density of the battery shell is the same at all places, the weight of the battery shell is heavy while ensuring that the battery shell has a certain structural strength, thereby resulting in a low weight energy density of the battery.

[0006] The utility model also aims to provide a battery bottom cover to solve the same technical problem as above.

[0007] The utility model also aims to provide a battery housing to solve the same technical problem as above.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the battery cylinder provided by the utility model is:

[0009] A battery cylinder comprises a cylinder body and cylinder reinforcing ribs arranged on the outer wall surface of the cylinder body, the strength of the material used for the cylinder reinforcing ribs is less than the strength of the material used for the cylinder body, and the thickness of the cylinder body and the cylinder reinforcing ribs satisfy: on the outer peripheral surface of the battery cylinder, the weight of the cylinder body per unit area is less than the weight of the cylinder reinforcing ribs per unit area.

[0010] Furthermore, at least one of the cylinder body and the cylinder reinforcement rib is made of a conductive material and has a first conductive connection portion for electrically connecting to a negative electrode tab of a battery.

[0011] The beneficial effects of the battery cylinder of the utility model are as follows: the utility model is a pioneering invention. In actual production and manufacturing, the sum of the radial thickness of the cylinder body and the radial thickness of the cylinder reinforcement ribs is not greater than the radial thickness of the battery cylinder in the prior art. The cylinder reinforcement ribs can be made of the same material as the battery cylinder in the prior art (such as aluminum and stainless steel). At this time, since the weight of the cylinder body per unit area on the outer peripheral surface of the battery cylinder is less than the weight of the cylinder reinforcement ribs per unit area, the weight of the battery cylinder can be reduced and the weight energy density of the battery can be improved. At the same time, since the cylinder body is thin, in order to ensure the structural strength of the battery cylinder, the cylinder body is made of a material with greater strength, so that the overall strength of the battery cylinder meets the use standards. Of course, the cylinder reinforcement ribs can also be made of a material different from the battery cylinder in the prior art (such as non-metallic materials with greater strength such as carbon fiber), as long as the overall strength of the battery cylinder can meet the use standards.

[0012] In order to achieve the above-mentioned purpose, the technical solution of the battery cylinder provided by the utility model is:

[0013] A battery cylinder comprises at least one cylinder thinning plate with a smaller thickness and at least two cylinder structural ribs with a larger thickness, wherein each cylinder thinning plate is respectively arranged between the cylinder structural ribs and / or between the cylinder structural ribs and the edge of the battery cylinder to form a complete cylinder; the strength of the material used for the cylinder thinning plate is greater than the strength of the material used for the cylinder structural ribs, and the thicknesses of the cylinder thinning plate and the cylinder structural ribs satisfy: on the outer peripheral surface of the battery cylinder, the weight of the cylinder thinning plate per unit area is less than the weight of the cylinder structural ribs per unit area.

[0014] Furthermore, the cylindrical structural rib is made of a conductive material and has a second conductive connection portion for electrically connecting to the negative electrode tab of the battery.

[0015] Furthermore, the cylinder structural ribs are divided into at least two annular structural ribs arranged along the circumference of the battery cylinder and at least two axial structural ribs arranged along the axial direction of the battery cylinder, and the annular structural ribs and the axial structural ribs are arranged alternately.

[0016] The beneficial effects of the battery cylinder of the utility model are as follows: the utility model is a pioneering invention. In actual production and manufacturing, the radial thickness of the cylinder structural ribs is not greater than the radial thickness of the battery cylinder in the prior art, and the cylinder structural ribs can be made of the same material as the battery cylinder in the prior art (such as aluminum and stainless steel). At this time, since the weight of the cylinder thinning plate per unit area on the outer peripheral surface of the battery cylinder is less than the weight of the cylinder structural ribs per unit area, the weight of the battery cylinder can be reduced and the weight energy density of the battery can be improved. At the same time, in order to ensure the structural strength of the battery cylinder, the cylinder thinning plate is made of a material with greater strength, so that the overall strength of the battery cylinder meets the use standards. Of course, the cylinder structural ribs can also be made of a material different from the battery cylinder in the prior art (such as non-metallic materials with greater strength such as carbon fiber), as long as the overall strength of the battery cylinder can meet the use standards.

[0017] In order to achieve the above-mentioned purpose, the technical solution of the battery bottom cover provided by the utility model is:

[0018] A battery bottom cover comprises a bottom cover body and a bottom cover reinforcement rib arranged on the lower surface of the bottom cover body, the strength of the material used for the bottom cover body is greater than the strength of the material used for the bottom cover reinforcement rib, and the thicknesses of the bottom cover body and the bottom cover reinforcement rib satisfy: on the lower surface of the battery bottom cover, the weight of the bottom cover body per unit area is less than the weight of the bottom cover reinforcement rib per unit area; the bottom cover body is made of conductive material.

[0019] The beneficial effects of the battery bottom cover of the utility model are as follows: the utility model is a pioneering invention. In actual production and manufacturing, the total thickness of the bottom cover body and the bottom cover reinforcement ribs is not greater than the thickness of the battery bottom cover in the prior art, and the bottom cover reinforcement ribs can be made of the same material as the battery bottom cover in the prior art (such as aluminum and stainless steel). At this time, since the weight of the bottom cover body per unit area on the lower surface of the battery bottom cover is less than the weight of the bottom cover reinforcement ribs per unit area, the weight of the battery bottom cover can be reduced and the weight energy density of the battery can be improved. At the same time, since the bottom cover body is thin, in order to ensure the structural strength of the battery bottom cover, the bottom cover body is made of a material with greater strength, so that the overall strength of the battery bottom cover meets the use standards. Of course, the bottom cover reinforcement ribs can also be made of a material different from the battery bottom cover in the prior art (such as a non-metallic material with greater strength such as carbon fiber), as long as the overall strength of the battery bottom cover meets the use standards.

[0020] In order to achieve the above-mentioned purpose, the technical solution of the battery bottom cover provided by the utility model is:

[0021] A battery bottom cover comprises at least one bottom cover thinning plate with a smaller thickness and at least two bottom cover structural ribs with a larger thickness, wherein each bottom cover thinning plate is respectively arranged between the bottom cover structural ribs and / or between the bottom cover structural ribs and the edge of the battery bottom cover to form a complete cover body; the strength of the material used for the bottom cover thinning plate is greater than the strength of the material used for the bottom cover structural ribs, and the thicknesses of the bottom cover thinning plate and the bottom cover structural ribs satisfy: on the lower surface of the battery bottom cover, the weight of the bottom cover thinning plate per unit area is less than the weight of the bottom cover structural ribs per unit area; and at least one of the bottom cover structural ribs and the bottom cover thinning plate is made of conductive material.

[0022] The beneficial effects of the battery bottom cover of the utility model are as follows: the utility model is a pioneering invention. In actual production and manufacturing, the thickness of the bottom cover structural ribs is not greater than the thickness of the battery bottom cover in the prior art, and the bottom cover structural ribs can be made of the same material as the battery bottom cover in the prior art (such as aluminum and stainless steel). At this time, since the weight of the bottom cover thinning plate per unit area on the lower surface of the battery bottom cover is less than the weight of the bottom cover structural ribs per unit area, the weight of the battery bottom cover can be reduced and the weight energy density of the battery can be improved. At the same time, since the bottom cover thinning plate is thin, in order to ensure the structural strength of the battery bottom cover, the bottom cover thinning plate is made of a material with greater strength, so that the overall strength of the battery bottom cover meets the use standards. Of course, the bottom cover reinforcement ribs can also be made of a material different from the battery bottom cover in the prior art (such as non-metallic materials with greater strength such as carbon fiber), as long as the overall strength of the battery bottom cover can meet the use standards.

[0023] In order to achieve the above-mentioned purpose, the technical solution of the battery housing provided by the utility model is:

[0024] A battery shell, comprising a battery cylinder and a battery bottom cover, the battery cylinder comprising a cylinder body and cylinder reinforcement ribs arranged on the outer wall surface of the cylinder body, the strength of the material used for the cylinder reinforcement ribs is less than the strength of the material used for the cylinder body, and the thicknesses of the cylinder body and the cylinder reinforcement ribs satisfy: on the outer peripheral surface of the battery cylinder, the weight of the cylinder body per unit area is less than the weight of the cylinder reinforcement ribs per unit area; or, the battery cylinder comprises at least one cylinder thinning plate with a smaller thickness and at least two cylinder structural ribs with a larger thickness, each cylinder thinning plate is respectively arranged between the cylinder structural ribs and / or between the cylinder structural ribs and the edge of the battery cylinder to form a complete cylinder; the strength of the material used for the cylinder thinning plate is greater than the strength of the material used for the cylinder structural ribs, and the thicknesses of the cylinder thinning plate and the cylinder structural ribs satisfy: on the outer peripheral surface of the battery cylinder, the weight of the cylinder thinning plate per unit area is less than the weight of the cylinder structural ribs per unit area; the battery bottom cover comprises the bottom cover itself The bottom cover body and the bottom cover reinforcement ribs arranged on the lower surface of the bottom cover body, the strength of the material used for the bottom cover body is greater than the strength of the material used for the bottom cover reinforcement ribs, and the thicknesses of the bottom cover body and the bottom cover reinforcement ribs satisfy: on the lower surface of the battery bottom cover, the weight of the bottom cover body per unit area is less than the weight of the bottom cover reinforcement ribs per unit area; the bottom cover body is made of conductive material; or, the battery bottom cover includes at least one bottom cover thinning plate with smaller thickness and at least two bottom cover structural ribs with larger thickness, each bottom cover thinning plate is respectively arranged between the bottom cover structural ribs and / or between the bottom cover structural ribs and the edge of the battery bottom cover to form a complete cover body; the strength of the material used for the bottom cover thinning plate is greater than the strength of the material used for the bottom cover structural ribs, and the thicknesses of the bottom cover thinning plate and the bottom cover structural ribs satisfy: on the lower surface of the battery bottom cover, the weight of the bottom cover thinning plate per unit area is less than the weight of the bottom cover structural ribs per unit area; at least one of the bottom cover structural ribs and the bottom cover thinning plate is made of conductive material.

[0025] Furthermore, the strength of the connection between the battery cylinder and the battery bottom cover is simultaneously greater than the strength of any one of the four groups of cylinder reinforcement ribs and bottom cover reinforcement ribs, cylinder reinforcement ribs and bottom cover structural ribs, cylinder structural ribs and bottom cover reinforcement ribs, and cylinder structural ribs and bottom cover structural ribs.

[0026] Furthermore, explosion-proof notches are provided on the bottom cover thinning plate or the bottom cover body of the battery bottom cover.

[0027] Furthermore, at least one of the cylinder body and the cylinder reinforcement rib is made of a conductive material and has a first conductive connection portion for electrically connecting to a negative electrode tab of a battery.

[0028] Furthermore, the cylindrical structural rib is made of a conductive material and has a second conductive connection portion for electrically connecting to the negative electrode tab of the battery.

[0029] Furthermore, the cylinder structural ribs are divided into at least two annular structural ribs arranged along the circumference of the battery cylinder and at least two axial structural ribs arranged along the axial direction of the battery cylinder, and the annular structural ribs and the axial structural ribs are arranged alternately.

[0030] The battery case of the utility model has the following beneficial effects: the utility model is an improved invention, which reduces the weight of the battery case by reducing the weight of the battery bottom cover and the battery barrel, thereby increasing the weight energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a battery cylinder of the battery housing of the utility model;

[0032] Figure 2 It is a structural schematic diagram of another battery cylinder of the battery housing of the utility model;

[0033] Figure 3 This is a schematic structural diagram of a battery bottom cover of a battery housing of the utility model;

[0034] Figure 4 The utility model is a schematic structural diagram of another battery bottom cover of the battery housing.

[0035] Description of reference numerals:

[0036] 1. Battery cylinder; 11. Cylinder reinforcement ribs; 12. Cylinder body; 13. Cylinder thinning plate; 14. Cylinder structural ribs; 2. Explosion-proof notches; 3. Battery bottom cover; 31. Bottom cover reinforcement ribs; 32. Bottom cover body; 33. Bottom cover structural ribs; 34. Bottom cover thinning plate. DETAILED DESCRIPTION

[0037] In order to solve the problems in the background technology, the core inventive concept of the utility model is: by adopting two materials with different strengths, and ensuring that the thickness of the material part with larger strength and the material part with smaller strength meet the following requirements: the weight per unit area of ​​the material part with larger strength is less than the weight per unit area of ​​the material part with smaller strength, thereby reducing the weight of the corresponding battery cylinder, battery bottom cover and battery shell, and improving the weight energy density of the battery.

[0038] The present invention is further described in detail below in conjunction with the embodiments.

[0039] The specific embodiment of the battery housing provided by the utility model is as follows:

[0040] like Figure 1-2 As shown, the battery housing includes a battery barrel 1 and a battery bottom cover 3.

[0041] Among them, the specific structure of the battery cylinder 1 is:

[0042] The battery cylinder 1 is mainly composed of a first component with a larger material strength and a second component with a smaller material strength. The thickness of the first component and the second component satisfies that: on the outer peripheral surface of the battery cylinder 1, the weight of the first component per unit area is less than the weight of the second component per unit area. The battery cylinder 1 can be made by injection molding technology, or by welding, bonding and other technologies; of course, a composite plate for winding into the battery cylinder 1 can also be made first, and the composite plate can be wound into the battery cylinder 1.

[0043] Specifically, as a specific implementation method, Figure 1 As shown, the battery cylinder 1 includes a cylinder body 12 (i.e., the first component) and a cylinder reinforcement rib 11 (i.e., the second component) arranged on the outer circumferential surface of the cylinder body 12. The strength of the material used for the cylinder body 12 is greater than the strength of the material used for the cylinder reinforcement rib 11, and the thickness of the cylinder body 12 and the cylinder reinforcement rib 11 satisfy: on the outer circumferential surface of the battery cylinder 1, the weight of the cylinder body 12 per unit area is less than the weight of the cylinder reinforcement rib 11 per unit area.

[0044] It should be specially noted that the inner wall surface of the battery cylinder 1 must be a plane after unfolding, otherwise other components in the battery cylinder 1 will be damaged. This is common knowledge in the field, and it is impossible for technical personnel in this field to deliberately make a battery cylinder 1 whose inner wall surface is not a plane after unfolding (that is, deliberately make unusable waste).

[0045] In a specific embodiment, the cylinder reinforcement ribs 11 include at least two annular reinforcement ribs arranged along the circumference of the cylinder body 12 and at least two axial reinforcement ribs arranged along the axial direction of the cylinder body 12, and the annular reinforcement ribs and the axial reinforcement ribs are arranged alternately. However, in other specific embodiments, the cylinder reinforcement ribs 11 may also include only two, three or more annular reinforcement ribs; or only two, three or more axial reinforcement ribs; or, the cylinder reinforcement ribs may also be divided into a first inclined reinforcement rib and a second inclined reinforcement rib with different inclination directions, and the first inclined reinforcement rib and the second inclined reinforcement rib cross each other and form an "X"-shaped structure (in this case, the angle between the first inclined reinforcement rib and the second inclined reinforcement rib is not equal to 90°). In this embodiment, there is no restriction on the arrangement of the reinforcement ribs on the cylinder body 12.

[0046] In actual production and manufacturing, the radial thickness of the battery cylinder 1 in this embodiment is not greater than the radial thickness of the battery cylinder in the prior art (that is, the sum of the radial thickness of the cylinder body 12 and the radial thickness of the cylinder reinforcement rib 11 is not greater than the radial thickness of the battery cylinder 1 in the prior art), and the cylinder reinforcement rib 11 can be made of the same material as the battery cylinder in the prior art (such as aluminum and stainless steel). At this time, since the weight of the cylinder body 12 per unit area on the outer peripheral surface of the battery cylinder 1 is less than the weight of the cylinder reinforcement rib 11 per unit area, the weight of the battery cylinder 1 can be reduced and the weight energy density of the battery can be improved. At the same time, since the cylinder body 12 is thin, in order to ensure the structural strength of the battery cylinder 1, the cylinder body 12 is made of a material with greater strength, so that the overall strength of the battery cylinder 1 meets the use standard. Of course, the cylinder reinforcement rib 11 can also be made of a material different from the battery cylinder in the prior art (such as a non-metallic material with greater strength such as carbon fiber), as long as the overall strength of the battery cylinder 1 can meet the use standard.

[0047] In order to make the battery cylinder 1 corrosion-resistant, as a specific embodiment, at least one of the cylinder body 12 and the cylinder reinforcement rib 11 is made of a conductive material (such as stainless steel or aluminum) and has a first conductive connection portion for electrically connecting to the battery negative electrode tab.

[0048] Specifically, in different specific embodiments, only the cylinder body 12 is made of conductive material, and the first conductive connection portion is the portion where the cylinder body 12 is connected to the battery bottom cover 3; or, only the cylinder reinforcement rib 11 is made of conductive material, and the first conductive connection portion is the portion where the cylinder reinforcement rib 11 is connected to the battery bottom cover 3; or, the cylinder reinforcement rib 11 and the cylinder body 12 can also be made of conductive metal materials, thereby further improving the corrosion resistance of the battery shell. In conductive metal materials, the greater the density, the higher the strength. Therefore, the density of the cylinder body 12 is greater than the density of the cylinder reinforcement rib 11; or, the battery cylinder 1 can also be made of non-metallic material (ceramic or carbon fiber) as a whole. In this case, the battery cylinder 1 does not have corrosion resistance.

[0049] Compared with a battery cylinder 1 made of a single material, using a metal material and a non-metal material to make a battery cylinder 1 has the following advantages: on the one hand, it has a certain corrosion resistance; on the other hand, the material selection is not limited to conductive metal materials, and non-metal materials with higher strength and lower density can also be used to reduce the weight of the battery cylinder 1.

[0050] As another specific implementation, Figure 2As shown, the battery cylinder 1 includes at least one cylinder thinning plate 13 with a smaller thickness and at least two cylinder structural ribs 14 with a larger thickness, and each cylinder thinning plate 13 is respectively arranged between the cylinder structural ribs 14 and / or between the cylinder structural ribs 14 and the edge of the battery cylinder 1 to form a complete cylinder; the strength of the material used for the cylinder thinning plate 13 is greater than the strength of the material used for the cylinder structural ribs 14, and the thickness of the cylinder thinning plate 13 and the cylinder structural ribs 14 meet: on the outer peripheral surface of the battery cylinder 1, the weight of the cylinder thinning plate 13 per unit area is less than the weight of the cylinder structural ribs 14 per unit area.

[0051] In actual production and manufacturing, the radial thickness of the battery cylinder 1 in this embodiment is not greater than the radial thickness of the battery cylinder in the prior art (that is, the radial thickness of the cylinder structural ribs 14 is not greater than the radial thickness of the battery cylinder 1 in the prior art), and the cylinder structural ribs 14 can be made of the same material as the battery cylinder in the prior art (such as aluminum and stainless steel). At this time, since the weight of the cylinder thinning plate 13 per unit area on the outer peripheral surface of the battery cylinder 1 is less than the weight of the cylinder structural ribs 14 per unit area, the weight of the battery cylinder 1 can be reduced and the weight energy density of the battery can be improved. At the same time, in order to ensure the structural strength of the battery cylinder 1, the cylinder thinning plate 13 is made of a material with greater strength, so that the overall strength of the battery cylinder 1 meets the use standards. Of course, the cylinder structural ribs 14 can also be made of a material different from the battery cylinder 1 in the prior art (such as non-metallic materials with greater strength such as carbon fiber), as long as the overall strength of the battery cylinder 1 can meet the use standards.

[0052] Accordingly, if Figure 2 As shown, in order to make the battery cylinder 1 have corrosion resistance, as a specific implementation, the cylinder structural rib 14 is made of a conductive material and has a second conductive connection portion for electrically connecting to the negative electrode tab of the battery, and the second conductive connection portion is specifically the portion where the cylinder structural rib 14 is connected to the battery bottom cover 3.

[0053] Specifically, Figure 2 As shown, the cylinder structural ribs 14 are divided into at least two annular structural ribs arranged along the circumference of the battery cylinder 1 and at least two axial structural ribs arranged along the axial direction of the battery cylinder 1. The annular structural ribs and the axial structural ribs are arranged alternately, and each cylinder thinning plate 13 is respectively arranged between the cylinder structural ribs 14 and between the cylinder structural ribs 14 and the edge of the battery cylinder 1. The structure is simple and the structural strength is high.

[0054] Of course, in other specific embodiments, refer to Figure 2 As shown, when the cylinder structure ribs 14 are located at the edge of the battery cylinder 1 , each cylinder thinning plate 13 is respectively arranged between the cylinder structure ribs 14 .

[0055] Of course, the cylinder structural rib 14 can also be divided into a first inclined structural rib and a second inclined structural rib with different inclination directions, the first inclined structural rib and the second inclined structural rib cross each other and form an "X"-shaped structure (at this time, the angle between the first inclined structural rib and the second inclined structural rib is not equal to 90°); or, the cylinder structural rib 14 only includes annular structural ribs located at both ends of the battery cylinder 1, the number of cylinder thinning plates 13 is one, and the two ends of the cylinder thinning plate 13 are respectively welded to the cylinder structural rib 14, or, the cylinder thinning plate 13 and the cylinder structural rib 14 are integrally injection molded.

[0056] In this embodiment, there is no restriction on the arrangement of the cylinder structural ribs 14 .

[0057] Among them, the specific structure of the battery bottom cover 3 is:

[0058] like Figure 3-4 As shown, the battery bottom cover 3 is mainly composed of a third component with a larger material strength and a fourth component with a smaller material strength, and the thickness of the third component and the fourth component satisfy: on the lower surface of the battery bottom cover 3, the weight of the third component per unit area is less than the weight of the fourth component per unit area. The battery bottom cover 3 can be made by injection molding technology, or by welding, bonding and other technologies.

[0059] As a specific implementation method, refer to Figure 3 As shown, the battery bottom cover 3 includes a bottom cover body 32 (ie, the third component) and a bottom cover reinforcing rib 31 (ie, the fourth component) arranged on the lower surface of the bottom cover body 32, and the bottom cover body 32 is made of conductive material and has a simple structure.

[0060] In actual use, the upper end of the bottom cover body 32 is used to connect with the negative electrode current collector (or negative electrode adapter), so that the bottom cover body 32 is electrically connected to the negative electrode tab; the lower end of the bottom cover body 32 is used to electrically connect with the electrical equipment directly or indirectly (through the battery top cover and the battery cylinder 1). How to use the battery bottom cover 3 to achieve electrical connection between the battery and the electrical equipment is common knowledge in the field and will not be repeated here.

[0061] In actual production and manufacturing, the thickness of the battery bottom cover 3 in this embodiment is not greater than the thickness of the battery bottom cover 3 in the prior art (that is, the total thickness of the bottom cover body 32 and the bottom cover reinforcement rib 31 is not greater than the thickness of the battery bottom cover 3 in the prior art), and the bottom cover reinforcement rib 31 can be made of the same material as the battery bottom cover in the prior art (such as aluminum and stainless steel). At this time, since the weight of the bottom cover body 32 per unit area on the lower surface of the battery bottom cover 3 is less than the weight of the bottom cover reinforcement rib 31 per unit area, the weight of the battery bottom cover 3 can be reduced and the weight energy density of the battery can be improved. At the same time, since the bottom cover body 32 is relatively thin, in order to ensure the structural strength of the battery bottom cover 3, the bottom cover body 32 is made of a material with greater strength, so that the overall strength of the battery bottom cover 3 meets the use standard. Of course, the bottom cover reinforcement rib 31 can also be made of a material different from the battery bottom cover in the prior art (such as a non-metallic material with greater strength such as carbon fiber), as long as the overall strength of the battery bottom cover 3 meets the use standard.

[0062] As another specific implementation, refer to Figure 4 As shown, the battery bottom cover 3 includes at least one bottom cover thinning plate 34 with a smaller thickness (i.e., the third component) and at least two bottom cover structural ribs 33 with a larger thickness (i.e., the fourth component), and each bottom cover thinning plate 34 is respectively arranged between the bottom cover structural ribs 33 and / or between the bottom cover structural ribs 33 and the edge of the battery bottom cover 3 to form a complete cover body; at least one of the bottom cover structural ribs 33 and the bottom cover thinning plate 34 is made of conductive material to utilize the battery bottom cover 3 to realize electrical connection between the battery and the electrical equipment.

[0063] Specifically, refer to Figure 4 As shown, the bottom cover structural rib 33 is a horizontal rib and a vertical rib forming a "cross" shape, there are four bottom cover thinning plates 34, and each bottom cover thinning plate 34 is respectively arranged between the bottom cover structural rib 33 and the edge of the battery bottom cover 3; in other specific embodiments, the bottom cover structural rib 33 can also be an annular rib, the number of the bottom cover thinning plate 34 is one and is arranged between the bottom cover structural rib 33; of course, the bottom cover structural rib 33 can also include 3 / 4 annular ribs and "cross" ribs at the same time, in which case each bottom cover thinning plate 34 is respectively arranged between the bottom cover structural rib 33 and between the bottom cover structural rib 33 and the edge of the battery bottom cover 3. In this embodiment, the specific structure of the bottom cover structural rib 33 is not limited.

[0064] In different specific embodiments, the bottom cover structural rib 33 is made of a conductive material, or the bottom cover thinning plate 34 is made of a conductive material, or both the bottom cover structural rib 33 and the bottom cover thinning plate 34 are made of a conductive material. The bottom cover structural rib 33 or the bottom cover thinning plate 34 can be made of non-metallic and non-conductive materials such as ceramics or carbon fiber.

[0065] In actual production and manufacturing, the thickness of the battery bottom cover 3 in this embodiment is not greater than the thickness of the battery bottom cover 3 in the prior art (that is, the thickness of the bottom cover structural rib 33 is not greater than the thickness of the battery bottom cover 3 in the prior art), and the bottom cover structural rib 33 can be made of the same material as the battery bottom cover in the prior art (such as aluminum and stainless steel). At this time, since the weight of the bottom cover thinning plate 34 per unit area on the lower surface of the battery bottom cover 3 is less than the weight of the bottom cover structural rib 33 per unit area, the weight of the battery bottom cover 3 can be reduced, and the weight energy density of the battery can be improved. At the same time, since the bottom cover thinning plate 34 is thin, in order to ensure the structural strength of the battery bottom cover 3, the bottom cover thinning plate 34 is made of a material with greater strength, so that the overall strength of the battery bottom cover 3 meets the use standard. Of course, the bottom cover reinforcing rib 31 can also be made of a material different from the battery bottom cover in the prior art (such as a non-metallic material with greater strength such as carbon fiber), as long as the overall strength of the battery bottom cover 3 can meet the use standard.

[0066] In order to improve the safety of the battery, Figure 3 As shown, an explosion-proof notch 2 is also provided on the bottom cover body 32, and the explosion-proof notch 2 and the corresponding part of the bottom cover body 32 are used as an explosion-proof valve to prevent the battery from exploding; or, as shown in FIG. Figure 4 As shown, an explosion-proof notch 2 is also provided on the bottom cover thinning plate 34. The explosion-proof notch 2 and the corresponding bottom cover thinning plate 34 are used as explosion-proof valves to prevent the battery from exploding.

[0067] Reference Figure 1-4 As shown, the improved battery cylinder 1 and battery bottom cover 3 in this embodiment can effectively improve the weight energy density of the battery. However, in other specific embodiments, the battery cylinder 1 can also have a cylinder reinforcement rib 11 or a cylinder structural rib 14, and the battery bottom cover 3 can be a battery bottom cover in the prior art; or, the battery bottom cover 3 can have a bottom cover reinforcement rib 31 or a bottom cover structural rib 33, and the battery cylinder 1 can be a battery cylinder in the prior art. At this time, compared with the battery shell in the prior art, the weight of the battery shell is still relatively low, which is conducive to improving the weight energy density of the battery.

[0068] Reference Figure 1-4 As shown, as a specific implementation, the strength of the connection between the battery cylinder 1 and the battery bottom cover 3 is greater than the strength of the second component (cylinder reinforcement rib 11 or cylinder structural rib 14) and the strength of the fourth component (bottom cover reinforcement rib 31 or bottom cover structural rib 33), thereby improving the structural strength of the connection between the battery cylinder 1 and the battery bottom cover 3, and ensuring that the structural strength of the battery shell meets the use requirements.

[0069] At the same time, from another perspective, when the structural strength of the connection between the battery cylinder 1 and the battery bottom cover 3 is certain (that is, when it meets the requirements), the structural strength of the second component and the fourth component can be appropriately reduced, thereby reducing the requirements for the material selection of the second component and the fourth component and saving costs.

[0070] When the battery casing is made entirely of two metal materials, since the metal material with greater strength also has a greater density, when the structural strength of the second component and the fourth component is reduced, the weight of the second component and the fourth component can also be reduced, thereby further improving the weight energy density of the battery.

[0071] However, in other specific embodiments, when the structural strength of the connection between the battery cylinder 1 and the battery bottom cover 3 is certain (i.e., meets the requirements), the structural strength of the second component and / or the fourth component can also be no less than the structural strength of the connection between the battery cylinder 1 and the battery bottom cover 3. At this time, the battery shell is relatively heavy, but still lighter than the battery shell in the prior art.

[0072] The specific embodiment of the battery cylinder provided by the utility model is as follows:

[0073] The specific structure of the battery cylinder in this embodiment is the same as the specific structure of the battery cylinder in the battery housing of the present invention, and will not be described in detail here.

[0074] The specific embodiment of the battery bottom cover provided by the utility model is as follows:

[0075] The specific structure of the battery bottom cover in this embodiment is the same as the specific structure of the battery bottom cover in the battery housing of the present invention, and will not be repeated here.

[0076] Finally, it should be noted that the above are only preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery cylinder, characterized in that: It includes a cylinder body and cylinder reinforcement ribs arranged on the outer wall of the cylinder body, the strength of the material used for the cylinder reinforcement ribs is less than the strength of the material used for the cylinder body, and the thickness of the cylinder body and the cylinder reinforcement ribs meet the following conditions: on the outer circumferential surface of the battery cylinder, the weight of the cylinder body per unit area is less than the weight of the cylinder reinforcement ribs per unit area.

2. The battery cartridge according to claim 1, wherein: At least one of the cylinder body and the cylinder reinforcement rib is made of a conductive material and has a first conductive connection portion for electrically connecting to a negative electrode tab of a battery.

3. A battery cylinder, characterized in that: The battery cylinder comprises at least one cylinder thinning plate with a smaller thickness and at least two cylinder structural ribs with a larger thickness, wherein each cylinder thinning plate is respectively arranged between the cylinder structural ribs and / or between the cylinder structural ribs and the edge of the battery cylinder to form a complete cylinder; the strength of the material used for the cylinder thinning plate is greater than the strength of the material used for the cylinder structural ribs, and the thicknesses of the cylinder thinning plate and the cylinder structural ribs satisfy: on the outer peripheral surface of the battery cylinder, the weight of the cylinder thinning plate per unit area is less than the weight of the cylinder structural ribs per unit area.

4. The battery cartridge as claimed in claim 3, characterized in that: The cylindrical structural rib is made of a conductive material and has a second conductive connection portion for electrically connecting to the negative electrode tab of the battery.

5. The battery cylinder according to claim 3 or 4, characterized in that: The cylinder structural ribs are divided into at least two annular structural ribs arranged along the circumference of the battery cylinder and at least two axial structural ribs arranged along the axial direction of the battery cylinder. The annular structural ribs and the axial structural ribs are arranged alternately.

6. A battery bottom cover, characterized in that: It includes a bottom cover body and a bottom cover reinforcement rib arranged on the lower surface of the bottom cover body. The strength of the material used for the bottom cover body is greater than the strength of the material used for the bottom cover reinforcement rib, and the thicknesses of the bottom cover body and the bottom cover reinforcement rib meet the following conditions: on the lower surface of the battery bottom cover, the weight of the bottom cover body per unit area is less than the weight of the bottom cover reinforcement rib per unit area; the bottom cover body is made of conductive material.

7. A battery bottom cover, characterized in that: It comprises at least one bottom cover thinning plate with smaller thickness and at least two bottom cover structural ribs with larger thickness, wherein each bottom cover thinning plate is respectively arranged between the bottom cover structural ribs and / or between the bottom cover structural ribs and the edge of the battery bottom cover to form a complete cover body; the strength of the material used for the bottom cover thinning plate is greater than the strength of the material used for the bottom cover structural ribs, and the thicknesses of the bottom cover thinning plate and the bottom cover structural ribs satisfy: on the lower surface of the battery bottom cover, the weight of the bottom cover thinning plate per unit area is less than the weight of the bottom cover structural ribs per unit area; at least one of the bottom cover structural ribs and the bottom cover thinning plate is made of conductive material.

8. A battery housing, comprising a battery barrel and a battery bottom cover, characterized in that: The battery cylinder is the battery cylinder described in any one of claims 1 to 5, and the battery bottom cover is the battery bottom cover described in any one of claims 6 to 7.

9. The battery case according to claim 8, characterized in that: The strength of the connection between the battery cylinder and the battery bottom cover is greater than the strength of any one of the four groups of cylinder reinforcement ribs and bottom cover reinforcement ribs, cylinder reinforcement ribs and bottom cover structural ribs, cylinder structural ribs and bottom cover reinforcement ribs, and cylinder structural ribs and bottom cover structural ribs.

10. The battery case according to claim 8, characterized in that: The bottom cover thinning plate or the bottom cover body of the battery bottom cover is provided with explosion-proof notches.

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