Cylindrical battery and battery device

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery and a battery device, the cylindrical battery comprises a battery shell, the battery shell comprises two end walls which are oppositely arranged, the roundness value of the end walls is 0.001 mm-0. 3mm, and the diameter of the end walls is greater than or equal to 40mm. The cylindrical battery has relatively good torsion resistance, and meanwhile, the end wall of the battery has a relatively good sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cylindrical battery and a battery device. Background Art

[0002] In the related art, in order to improve the space utilization of the display device, the cylindrical battery has a larger diameter. However, as the diameter of the cylindrical battery increases, the roundness value of the two end walls of the cylindrical battery also increases accordingly, which will lead to poor matching between the battery end wall and the opening, poor sealing when assembling the battery end wall, and low battery grouping efficiency. At the same time, the roundness value of the two end walls of the cylindrical battery is too large, which will also lead to poor anti-torsion performance of the battery. In addition, the roundness value of the two end walls of the cylindrical battery is too large, which will also cause the battery transport fixture and the battery shape to not match, resulting in problems such as the battery transport fixture and the battery are not firmly fixed.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a cylindrical battery, which can solve the problems of poor sealing of battery end walls, poor anti-twisting performance of batteries, and loose fixation of battery transport fixtures and batteries.

[0005] The cylindrical battery comprises:

[0006] A battery shell, the battery shell comprising two end walls arranged opposite to each other, the roundness value of the end walls being 0.001 mm-0.3 mm, and the diameter of the end walls being greater than or equal to 40 mm.

[0007] In the utility model, for cylindrical batteries with large diameters, the relative assembly error is large during shell assembly. If the roundness value of the end wall in the cylindrical battery is too large, it will lead to problems such as poor sealing during battery end wall assembly, low battery grouping efficiency, poor battery torsion resistance, and loose fixation of battery transport fixtures and batteries. If the roundness value of the end wall in the cylindrical battery is too small, the end wall is prone to rotate along its center during the clamping and assembly process, thereby affecting the fit of the end wall during assembly. At the same time, if the roundness value of the end wall in the cylindrical battery is too small, it will also increase the process cost of the cylindrical battery. The utility model sets the roundness value of the end wall in the cylindrical battery to an appropriate size. This setting can not only improve the problems such as poor sealing of the battery end wall, poor battery torsion resistance, and loose fixation of the battery transport fixture and batteries, but also improve the fit of the battery end wall and reduce the process cost of the cylindrical battery.

[0008] The utility model also provides a battery device, which includes the above-mentioned cylindrical battery and also has the technical effect of the above-mentioned cylindrical battery.

[0009] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.

[0011] in:

[0012] Figure 1 It is a structural schematic diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0013] Figure 2 This is a schematic diagram of the assembly structure of an exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of a battery cell in an exemplary embodiment of a cylindrical battery disclosed herein;

[0015] Figure 4 A partial cross-sectional view of a cylindrical battery disclosed in the present invention along its axial direction;

[0016] Figure 5 It is a structural schematic diagram of an exemplary embodiment of the battery device disclosed in the present invention;

[0017] Figure 6 FIG. 4 is a schematic structural diagram of another exemplary embodiment of a battery device disclosed herein.

[0018] Description of reference numerals:

[0019] 1. Battery shell; 10. Cylindrical battery; 11. End wall; 111. First end wall; 12. Main shell; 2. Post; 3. Battery cell; 31. End face; 4. Current collector; 5. Pressure relief structure; 6. Bottom plate; 7. Through hole; 8. Exhaust channel. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0021] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0022] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0023] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0024] like Figure 1-3 As shown, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 2 This is a schematic diagram of the assembly structure of an exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 3 It is a schematic diagram of the structure of a battery cell in an exemplary embodiment of a cylindrical battery disclosed in the present invention.

[0025] The cylindrical battery comprises: a battery housing 1, wherein the battery housing 1 comprises two end walls 11 arranged opposite to each other, wherein the roundness value of the end walls 11 is 0.001 mm-0.3 mm, and the diameter of the end walls is greater than or equal to 40 mm.

[0026] In this exemplary embodiment, if the roundness value of the end wall 11 in the cylindrical battery is too large, it will lead to problems such as poor sealing of the battery end wall 11 during assembly, low battery grouping efficiency, poor battery torsion resistance, and loose fixation of the battery transport fixture and battery; if the roundness value of the end wall 11 in the cylindrical battery is too small, the battery end wall 11 is prone to rotate along its center during the clamping and assembly process, thereby affecting the fit of the end wall 11 during assembly. At the same time, if the roundness value of the end wall 11 in the cylindrical battery is too small, it will also increase the process cost of the cylindrical battery. In this exemplary embodiment, the roundness value of the end wall 11 in the cylindrical battery is set to an appropriate size. This setting can not only improve the problems such as poor sealing of the battery end wall 11, poor battery torsion resistance, and loose fixation of the battery transport fixture and battery, but also improve the fit of the battery end wall 11 and reduce the process cost of the cylindrical battery. In particular, for cylindrical batteries with large diameters, the larger the circumference of the end wall, the worse the matching degree between the end wall and the shell, the more difficult it is to install, and the error is correspondingly amplified.

[0027] In the present exemplary embodiment, the roundness value of the end wall 11 may be equal to 0.001 mm, 0.002 mm, 0.004 mm, 0.006 mm, 0.008 mm, 0.01 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, etc. The diameter of the end wall may be equal to 40 mm, 42 mm, 44 mm, 46 mm, 48 mm, 50 mm, 52 mm, 54 mm, 56 mm, 58 mm, 60 mm, etc.

[0028] In this exemplary embodiment, Figure 1-3 As shown, the absolute value of the difference in roundness values ​​of the two end walls 11 is less than or equal to 0.12 mm. For example, the absolute value of the difference in roundness values ​​of the two end walls 11 can be equal to 0, 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, etc. If the absolute value of the difference in roundness values ​​of the two end walls 11 is too large, at least one of the two end walls will be poorly assembled, and it will be difficult to accurately position the cylindrical battery during the grouping process. This exemplary embodiment sets the absolute value of the difference in roundness values ​​of the two end walls 11 to a smaller value, which can improve the above problems.

[0029] In this exemplary embodiment, Figure 1-3As shown, the battery housing 1 also includes: a main housing 12, the main housing 12 is formed with at least one opening, and the two end walls 11 include a first end wall 111, the first end wall 111 blocks the opening, and the roundness value of the first end wall 111 is 0.002mm-0.2mm. For example, the roundness value of the first end wall 111 is equal to 0.002mm, 0.004mm, 0.006mm, 0.008mm, 0.01mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, 0.2mm, etc. If the roundness value of the first end wall is too small, the first end wall 111 is prone to rotate along its center during the clamping and assembly process, thereby affecting the fit between the first end wall 111 and the opening; if the roundness value of the first end wall 111 is too large, the shape of the first end wall 111 and the opening is difficult to match, and the connection stability of the first end wall 111 and the main housing 12 is poor. In this exemplary embodiment, the roundness value of the first end wall 111 is set to a suitable value, which can improve the fit between the first end wall 111 and the opening, and also improve the matching between the first end wall 111 and the opening.

[0030] In this exemplary embodiment, Figure 1-3 As shown, the first end wall 111 and the main shell 12 can be welded. The welded first end wall 111 and the main shell 12 have good structural stability. By limiting the roundness value of the end wall of the large-diameter cylindrical battery, the roundness value of the first end wall 111 is prevented from being too large. During the welding process of the first end wall 111 and the main shell 12, the laser hits the inside of the battery, causing damage to the battery cell structure, and the diaphragm shrinks due to heat, causing the safety risk of short circuit of the positive and negative electrodes. The larger the diameter of the cylindrical battery, the more obvious the above problems are, and the larger the circumference of the battery end wall, the more difficult the matching degree is; the greater the difference in the roundness value of the opening of the first end wall 111 and the main shell 12, the larger the unmatched part during the corresponding sealing welding, the larger the gap between the end wall and the main shell, and the greater the risk of high-temperature welding laser damaging the internal structure of the battery. It should be understood that in other exemplary embodiments, the first end wall 111 and the main shell 12 can also be connected by bonding, hot melting or physical fixing.

[0031] In this exemplary embodiment, Figure 1-3As shown, the cylindrical battery also includes: a pole 2, the pole 2 is arranged on the first end wall 111, the pole 2 includes a cylindrical structure axially perpendicular to the first end wall 111, and the absolute value of the difference between the roundness value of the cylindrical structure and the roundness value of the first end wall 111 is less than or equal to 0.1mm. For example, the absolute value of the difference between the roundness value of the cylindrical structure and the roundness value of the first end wall 111 can be equal to 0.1mm, 0.09mm, 0.08mm, 0.07mm, 0.06mm, 0.05mm, 0.04mm, 0.03mm, 0.02mm, 0.01mm, etc. If the absolute value of the difference between the roundness value of the cylindrical structure in the pole 2 and the roundness value of the first end wall 111 is too large, it will cause the pole to be difficult to be centered on the first end wall 111, and when the pole 2 squeezes the first end wall 111, the first end wall 111 is prone to warping and deformation. In this exemplary embodiment, the absolute value of the difference between the roundness value of the cylindrical structure in the pole 2 and the roundness value of the first end wall 111 is set to a smaller value, which can improve the stability of the overall structure of the cylindrical battery.

[0032] In this exemplary embodiment, Figure 1-3 As shown, the cylindrical battery also includes: a battery cell 3, which can be a cylindrical structure, and the battery cell 3 includes end faces 31 arranged opposite to each other on the axial direction X of the cylindrical battery, and the roundness value of the end face 31 of the battery cell is less than or equal to 0.8 mm. For example, the roundness value of the end face 31 of the battery cell can be equal to 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc. In this exemplary embodiment, the roundness value of the battery cell 3 is set to a smaller value, which can improve the efficiency of the battery cell 3 entering the battery housing 1, and at the same time, it can avoid the battery cell 3 and the battery housing from interfering with each other when the battery cell 3 enters the interior of the battery housing 1, thereby causing the battery cell 3 to be damaged.

[0033] In this exemplary embodiment, Figure 4 As shown, it is a partial cross-sectional view of the cylindrical battery of the present invention along its axial direction. The cylindrical battery may also include: a current collector 4, the current collector 4 includes two opposite circular side surfaces, the two opposite circular side surfaces of the current collector 4 are electrically connected to the battery cell 3 and the end wall 11 respectively, and the roundness value of the current collector 4 is less than or equal to 0.5 mm. For example, the roundness value of the current collector 4 can be equal to 0.5 mm, 0.4 mm, 0.3 mm, 0.2 mm, 0.1 mm, etc. In this exemplary embodiment, the roundness value of the current collector 4 is set to a smaller value. This setting can facilitate the coaxial setting of the current collector 4 and the battery shell 1 and the battery cell 3, thereby improving the accuracy of the welding position of the current collector 4 and the battery cell 3 and the battery shell 1. The current collector 4 with an accurate welding position can have a relatively stable connection structure with the battery cell 3 and the battery shell 1, and can also ensure that the cylindrical battery has a larger flow area through the current collector 4.

[0034] In this exemplary embodiment, the absolute value of the difference between the roundness value of the current collector 4 and the roundness value of the end wall 11 can be 0.05mm-0.5mm. For example, the absolute value of the difference between the roundness value of the current collector 4 and the roundness value of the end wall 11 can be equal to 0.05mm, 0.07mm, 0.09mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. In this exemplary embodiment, the absolute value of the difference between the roundness value of the current collector 4 and the roundness value of the end wall 11 is set to a smaller value, which can improve the connection strength and flow area of ​​the current collector 4 and the end wall 11.

[0035] It should be noted that, in this exemplary embodiment, the roundness can be measured according to the JIS B0621-1984 standard, and can be measured by the diameter method or the least squares circle method. Specifically, the roundness value of the end wall 11 can be the roundness value of the end wall on the outer side of the battery housing; the roundness value of the cylindrical structure in the pole refers to the roundness value of the cylindrical structure at any cross section perpendicular to its axial direction; the roundness value of the current collector 4 can be the roundness value of any circular side of the current collector 4.

[0036] In this exemplary embodiment, Figure 1-3 As shown, the two end walls 11 include a first end wall 111 and a second end wall 112; the battery housing 1 also includes: a peripheral wall 13, the peripheral wall 13 is located between the two end walls 11, the peripheral wall 13 and the second end wall 112 are integrally formed, and are separately formed from the first end wall 111; the size of the battery housing in its axial direction is less than or equal to 150mm. For example, the size of the battery housing in its axial direction can be equal to 150mm, 140mm, 130mm, 120mm, 110mm, 100mm, 90mm, etc. In this exemplary embodiment, the peripheral wall 13 and the second end wall 112 can be integrally formed by a stretching or stamping process. The larger the axial length of the battery housing, the smaller the thickness of the peripheral wall 13, and the more difficult it is to control the roundness value of the peripheral wall 13 facing the open end of the first end wall 111, which easily leads to a large difference between the roundness value of the open end of the peripheral wall 13 and the roundness value of the first end wall 111, which in turn leads to a large sealing error between the first end wall 111 and the peripheral wall 13. This exemplary embodiment sets the dimension of the battery case 1 in the axial direction to a smaller value, thereby improving the sealing quality of the first end wall 111 and the peripheral wall 13. The peripheral wall 13 and the first end wall 111 may be connected by welding.

[0037] In this exemplary embodiment, Figure 1-3As shown, the battery shell 1 includes steel, for example, the battery shell can be a steel shell, and the steel shell material can be selected from carbon steel, stainless steel, nickel-plated steel, etc. The roundness value of the first end wall 111 is 0.002mm-0.19mm. For example, the roundness value of the first end wall 111 can be equal to 0.002mm, 0.004mm, 0.006mm, 0.008mm, 0.01mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, 0.19mm, etc. The melting point of the steel shell is higher than that of the aluminum shell, and the laser heat generated during the welding process of the steel shell is relatively large. In this exemplary embodiment, the roundness value of the first end wall 111 in the steel shell is set to a smaller value, so that the laser damage to other structures inside the battery during the welding process of the steel shell can be avoided.

[0038] It should be understood that in other exemplary embodiments, the battery housing 1 includes aluminum, for example, the battery housing 1 is an aluminum shell. The roundness value of the first end wall 111 can be 0.005mm-0.2mm. For example, the roundness value of the first end wall 111 can be equal to 0.005mm, 0.006mm, 0.008mm, 0.01mm, 0.02mm, 0.04mm, 0.06mm, 0.08mm, 0.1mm, 0.2mm, etc. The ductility of the aluminum shell is good. When the peripheral wall 13 and the first end wall 111 are welded, the peripheral wall 13 can be shaped and adjusted. Therefore, the aluminum shell has a lower requirement for the roundness value of the first end wall 111, and the roundness value of the first end wall 111 can be set larger, which can reduce the manufacturing cost of the battery.

[0039] In this exemplary embodiment, the two end walls 11 include a first end wall 111, and a pole hole is arranged on the first end wall 111. The cylindrical battery also includes: a pole 2, and the pole 2 is partially arranged in the pole hole. The pole 2 and the first end wall 111 form two voltage output ends of the cylindrical battery, and the pole 2 and the first end wall 111 have opposite polarities; the ratio of the area of ​​the orthographic projection of the pole 2 on the plane where the first end wall 111 is located to the area of ​​the first end wall 111 is 5%-50%, or 10%-30%. For example, the ratio of the area of ​​the orthographic projection of the pole 2 on the plane where the first end wall 111 is located to the area of ​​the first end wall 111 can be equal to 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, etc. This exemplary embodiment can make the current flow capacity between the pole 2 and the first end wall 111 more balanced, and the current density between the positive and negative poles more uniform, so as to ensure the current transmission rate of the entire battery, and avoid the problem of local overheating of either polarity due to the narrow current flow area, thereby improving the safety performance of the cylindrical battery. Since the positive and negative output terminals of the above-mentioned battery are arranged at the same end of the battery, the smaller the roundness value of the end wall is, the better the matching performance of the pole and the end wall is, the more stable the connection between the two is, and when two adjacent batteries are electrically connected subsequently, they can be accurately positioned, and the flow area between the batteries can be guaranteed; if the roundness value of the end wall is too small, the anti-twist performance of the end wall is too poor, the tooling clamping process is more difficult, and it is easy to rotate during assembly. The ratio of the area of ​​the positive projection of the pole 2 on the plane where the first end wall 111 is located to the area of ​​the first end wall 111 is too small, and the area of ​​the first end wall 111 is too large. The anti-twist performance of the cylindrical battery is poor, the deformation of the end wall is large, and stress concentration is easy to occur during the assembly process of the pole and the end wall. Therefore, in this exemplary embodiment, the ratio of the area of ​​the positive projection of the pole 2 on the plane where the first end wall 111 is located to the area of ​​the first end wall 111 is set to an appropriate size, so as to ensure the balance of the positive and negative currents of the entire battery while avoiding the easy torsional deformation of the end wall during the assembly process, thereby improving the overall strength and assembly efficiency of the battery shell. It should be noted that the area of ​​the first end wall 111 does not include the area of ​​the pole hole.

[0040] This exemplary embodiment also provides a battery device, such as Figure 5 FIG. 2 is a schematic diagram of a battery device according to an exemplary embodiment of the present disclosure. The battery device includes a plurality of cylindrical batteries 10 as described above.

[0041] like Figure 5As shown, in two adjacent cylindrical batteries, the absolute value of the difference in roundness values ​​of any two end walls 11 located at different cylindrical batteries is less than or equal to 0.15 mm. For example, the absolute value of the difference in roundness values ​​of any two end walls 11 located at different cylindrical batteries can be equal to 0.15 mm, 0.14 mm, 0.13 mm, 0.12 mm, 0.11 mm, 0.1 mm, 0.09 mm, 0.08 mm, 0.07 mm, 0.06 mm, 0.05 mm, 0.04 mm, 0.03 mm, 0.02 mm, 0.01 mm, etc. If the absolute value of the difference in roundness values ​​of the two end walls 11 in two adjacent cylindrical batteries is too large, there will be a risk of short circuit in the conductive bar used to electrically connect multiple cylindrical batteries. In this exemplary embodiment, the absolute value of the difference in roundness values ​​of the two end walls 11 in two adjacent cylindrical batteries is set to a smaller value, thereby reducing the risk of short circuit in the conductive bar.

[0042] like Figure 5 As shown, the battery also includes a pressure relief structure 5 arranged on the end wall 11; the battery device also includes: a bottom plate 6, a gas exhaust channel 8 is formed on the bottom plate 6, and a through hole 7 connected to the gas exhaust channel 8, the pressure relief structure 5 is located on the side of the cylindrical battery facing the bottom plate 6, the through hole 7 is located on the side of the bottom plate 6 facing the cylindrical battery 10, and the orthographic projection of the pressure relief structure 5 on the bottom plate 6 and the through hole 7 at least partially overlap, and the roundness value of the through hole 7 is less than or equal to 3mm. The roundness value of the through hole 7 can be equal to 3mm, 2mm, 1mm, etc. In this exemplary embodiment, the roundness value of the through hole 7 is set to be smaller, and the centroid of the orthographic projection of the pressure relief structure 5 on the bottom plate 6 can be set close to the center of the through hole 7. When the cylindrical battery is thermally runaway, the high-temperature and high-pressure gas discharged by the cylindrical battery through the pressure relief structure can be accurately sprayed toward the through hole 7, and then enter the gas exhaust channel 8, thereby reducing the risk of high-temperature and high-pressure gas causing thermal runaway of adjacent cylindrical batteries.

[0043] In this exemplary embodiment, the pressure relief structure 5 can be formed by a notch located on the end wall 11. The notch can be a closed figure, for example, the notch can be a circle, a rectangle, a triangle, an irregular figure, etc. The notch can also be a non-closed figure, for example, the notch can be a "cross" shape, a "T" shape, an "X" shape, etc. The pressure relief structure 5 can also be a thinned area formed by stamping, the pressure relief structure can also be a thinned area of ​​the end wall 11 itself, and the pressure relief structure 5 can also be a patch attached to the explosion-proof opening.

[0044] It should be noted that when the pressure relief structure 5 is a solid structure such as a patch or a thinned area, the orthographic projection of the patch or the thinned area on the base plate is the orthographic projection of the pressure relief structure on the base plate; when the pressure relief structure 5 is formed by a closed-shaped notch, the orthographic projection of the area enclosed by the closed-shaped notch on the base plate is the orthographic projection of the pressure relief structure on the base plate; when the pressure relief structure 5 is formed by a non-closed-shaped notch, the orthographic projection of the minimum circumscribed circle of the non-closed-shaped notch on the base plate is the orthographic projection of the pressure relief structure on the base plate.

[0045] like Figure 6 , which is a schematic diagram of the structure of another exemplary embodiment of the battery device of the present disclosure. The battery device also includes: a first bus bar 91 and a second bus bar 92; the first bus bar 91 is connected to the pole 2 of the cylindrical battery, the second bus bar 92 is connected to the first end wall 111 of the cylindrical battery, and the first bus bar 91 and the second bus bar 92 are located on the same end face of the cylindrical battery. This arrangement can improve the space utilization of the battery device. Among them, the first bus bar 91 and the second bus bar 92 can be used to connect the cylindrical batteries in series or in parallel.

[0046] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, or the like.

[0047] In this exemplary embodiment, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface located between the two circular end surfaces.

[0048] The battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0049] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0050] The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries. The battery may be a cylindrical battery, and the cylindrical battery may be arranged on a support plate to form a battery module.

[0051] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0052] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.

[0053] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0054] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0055] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cylindrical battery, characterized in that: The cylindrical battery comprises: A battery housing (1), the battery housing (1) comprising two end walls (11) arranged opposite to each other, the roundness value of the end walls (11) being 0.001 mm-0.3 mm, and the diameter of the end walls (11) being greater than or equal to 40 mm.

2. The cylindrical battery according to claim 1, characterized in that: The absolute value of the difference between the roundness values ​​of the two end walls (11) is less than or equal to 0.12 mm.

3. The cylindrical battery according to claim 1, characterized in that: The battery housing (1) comprises: A main shell (12), wherein the main shell (12) is formed with at least one opening, wherein the two end walls (11) include a first end wall (111), wherein the first end wall (111) blocks the opening, and wherein the roundness value of the first end wall (111) is 0.002 mm-0.2 mm.

4. The cylindrical battery according to claim 3, characterized in that: The first end wall (111) and the main shell (12) are connected by welding.

5. The cylindrical battery according to claim 1, characterized in that: The two end walls (11) include a first end wall (111), and the cylindrical battery further includes: A pole (2), the pole (2) being arranged on the first end wall (111), the pole (2) comprising a cylindrical structure axially perpendicular to the first end wall (111), the absolute value of the difference between the roundness value of the cylindrical structure in the pole (2) and the roundness value of the first end wall (111) being less than or equal to 0.1 mm.

6. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery also includes: A battery cell (3), the battery cell (3) being of a cylindrical structure, the battery cell (3) comprising end faces (31) arranged opposite to each other in the axial direction of the cylindrical battery, the roundness value of the end faces (31) of the battery cell being less than or equal to 0.8 mm.

7. The cylindrical battery according to claim 6, characterized in that: The cylindrical battery also includes: A current collecting member (4), the current collecting member (4) comprising two opposite circular side surfaces, the two opposite circular side surfaces of the current collecting member (4) being electrically connected to the battery core (3) and the end wall (11) respectively, and the roundness value of the current collecting member (4) being less than or equal to 0.5 mm.

8. The cylindrical battery according to claim 7, characterized in that: The absolute value of the difference between the roundness value of the current collecting member (4) and the roundness value of the end wall (11) is 0.05 mm to 0.5 mm.

9. The cylindrical battery according to claim 1, characterized in that: The two end walls (11) include a first end wall (111), and a pole hole is provided on the first end wall (111). The cylindrical battery also includes: A pole (2), wherein the pole (2) is partially disposed in the pole hole, the pole (2) and the first end wall (111) form two voltage output ends of the cylindrical battery, and the pole (2) and the first end wall (111) have opposite polarities; The ratio of the area of ​​the orthographic projection of the pole (2) on the plane where the first end wall (111) is located to the area of ​​the first end wall (111) is 5%-50%.

10. The cylindrical battery according to claim 1, characterized in that: The two end walls (11) include a first end wall (111) and a second end wall (112); The battery housing (1) further comprises: A peripheral wall (13), the peripheral wall (13) being located between the two end walls (11), the peripheral wall (13) being integrally formed with the second end wall (112), and being separately formed with the first end wall (111); The dimension of the battery housing in the axial direction is less than or equal to 150 mm.

11. The cylindrical battery according to claim 4, characterized in that: The battery housing (1) comprises aluminum, and the roundness value of the first end wall (111) is 0.005 mm-0.2 mm.

12. The cylindrical battery according to claim 4, characterized in that: The battery housing (1) comprises steel, and the roundness value of the first end wall (111) is 0.002 mm-0.19 mm.

13. A battery device, characterized in that: The battery device comprises a plurality of cylindrical batteries according to any one of claims 1 to 12.

14. The battery device according to claim 13, characterized in that: In two adjacent cylindrical batteries, the absolute value of the difference in roundness values ​​between any two end walls (11) located at different cylindrical batteries is less than or equal to 0.15 mm.

15. The battery device according to claim 13, characterized in that: The battery further comprises a pressure relief structure (5) arranged on the end wall (11); The battery device further comprises: A bottom plate (6), wherein an exhaust channel (8) and a through hole (7) connected to the exhaust channel (8) are formed on the bottom plate, the pressure relief structure (5) is located on the side of the cylindrical battery facing the bottom plate (6), the through hole (7) is located on the side of the bottom plate (6) facing the cylindrical battery, and the orthographic projection of the pressure relief structure (5) on the bottom plate (6) at least partially overlaps with the through hole, and the roundness value of the through hole is less than or equal to 3 mm.

16. The battery device according to claim 13, characterized in that: The battery device further comprises: A first bus bar (91); A second busbar (92), wherein the first busbar (91) is connected to the pole of the cylindrical battery, the second busbar (92) is connected to the first end wall of the cylindrical battery, and the first busbar (91) and the second busbar (92) are located on the same end surface of the cylindrical battery.

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