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, and the cylindrical battery comprises a battery shell which comprises two end walls arranged oppositely and a peripheral wall connected between the two end walls; wherein the distance between the two end walls is L1, the radius of each end wall is r, the thickness of the peripheral wall is d1, the thickness of each end wall is d2, (d2 * r) / (2d1 * L1) is 0.05-0.85, and the radius of each end wall is larger than or equal to 19 mm. The arrangement can increase the overall strength and structural stability of the battery shell.

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, cylindrical batteries are generally placed vertically along their axial direction in a battery case. Cylindrical batteries are easily deformed by the squeezing force along their axial direction. The deformation of the cylindrical batteries may further cause damage to the internal structure of the battery or the external electrical connection structure.

[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 problem that the cylindrical battery is easy to deform.

[0005] Cylindrical batteries include:

[0006] A battery housing, the battery housing comprising two end walls arranged opposite to each other, and a peripheral wall connected between the end walls;

[0007] Among them, the distance between the two end walls is L1, the radius of the end wall is r, the thickness of the peripheral wall is d1, the thickness of the end wall is d2, (d2*r) / (2d1*L1) is 0.05-0.85, and the radius of the end wall is ≥19mm.

[0008] In order to improve the overall space utilization rate inside the existing batteries, the radius of the batteries is getting larger and larger. However, large-sized batteries produce serious gassing, and the volume difference between the end wall and the surrounding wall of the battery shell is large, resulting in inconsistent compressive strength. That is, the battery height is too large, the end wall is too thin and the radius is too small, and the stress on the end wall is concentrated, resulting in damage to the end wall; while the thickness and radius of the end wall are too large and the thickness of the surrounding wall is too small, it will make the surrounding wall difficult to resist pressure. Not only is it difficult for the surrounding wall to resist the pressure of the end wall, but the expansion of the battery cell will also cause serious deformation of the surrounding wall. That is, the connection strength between the end wall and the surrounding wall is weak, and the battery shell is prone to structural damage, thereby causing battery safety risks.

[0009] The utility model sets (d2*r) / (2d1*L1) to a suitable value, which can not only improve the anti-extrusion ability of the end wall and the peripheral wall, but also improve the stability of the connection between the end wall and the peripheral wall.

[0010] 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.

[0011] 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

[0012] 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.

[0013] in:

[0014] Figure 1 It is a schematic structural diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0015] Figure 2 A cross-sectional view of an exemplary embodiment of a cylindrical battery disclosed herein along its axial direction;

[0016] Figure 3 This is a schematic diagram of the structure of a winding core in an exemplary embodiment of a cylindrical battery disclosed herein;

[0017] Figure 4 It is a schematic structural diagram of an exemplary embodiment of a battery device disclosed in the present invention.

[0018] Description of reference numerals:

[0019] 1. Battery shell; 10. Cylindrical battery; 11. End wall; 12. Peripheral wall; 2. Winding core; 21. Winding core body; 221. Positive electrode ear; 222. Negative electrode ear; 3. Conductive bar; 4. Battery case; 41. Bottom plate; 5. Insulating film. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying 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 , 2 , 3, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 2 is a cross-sectional view of an exemplary embodiment of a cylindrical battery disclosed in the present invention along its axial direction, Figure 3 The schematic diagram of the structure of the winding core in an exemplary embodiment of the cylindrical battery disclosed in the present invention. The cylindrical battery comprises: a battery housing 1, the battery housing 1 comprises two end walls 11 arranged opposite to each other, and a peripheral wall 12 connected between the end walls 11; wherein the distance between the end walls 11 is L1, the radius of the end wall 11 is r, the thickness of the peripheral wall 12 is d1, the thickness of the end wall 11 is d2, (d2*r) / (2d1*L1) is 0.05-0.85, and the radius of the end wall 11 is ≥19mm.

[0025] In order to improve the overall space utilization rate inside the battery, the radius of the existing battery is getting bigger and bigger. However, large-sized batteries produce serious gas, and the volume difference between the end wall and the peripheral wall of the battery shell is large, and there is inconsistency in compressive strength, that is, the battery height is too large, the end wall is too thin and the radius is too small, the stress of the end wall is concentrated, and the end wall is easily damaged; while the thickness and radius of the end wall are too large, and the thickness of the peripheral wall is too small, it will cause the peripheral wall to be difficult to resist pressure. Not only is it difficult for the peripheral wall to resist the pressure of the end wall, but the expansion of the battery cell will also cause serious deformation of the peripheral wall, that is, the connection strength between the end wall and the peripheral wall is weak, and the battery shell is prone to structural damage, thereby causing battery safety risks. The utility model sets (d2*r) / (2d1*L1) to a suitable size, which can not only improve the anti-extrusion ability of the end wall and the peripheral wall, but also improve the stability of the connection between the end wall and the peripheral wall.

[0026] In the present exemplary embodiment, (d2*r) / (2d1*L1) may be equal to 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.85, etc. The radius of the end wall 11 may be equal to 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, etc.

[0027] In this exemplary embodiment, d2 / d1 is 1-4. For example, d2 / d1 can be equal to 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, etc. If d2 / d1 is too large and d1 is too small, the thickness of the peripheral wall 12 of the battery housing is too small, and the peripheral wall 12 has a weak ability to resist deformation; if d2 / d1 is too small, the thickness of the end wall 11 is too small, and the risk of deformation of the end wall 11 under stress is greater. In this exemplary embodiment, d2 / d1 is set to a suitable size, which can not only improve the ability of the peripheral wall 12 to resist deformation, but also reduce the risk of deformation of the end wall 11.

[0028] In this exemplary embodiment, the thickness of the peripheral wall 12 is 0.25mm-0.6mm. For example, the thickness of the peripheral wall 12 can be 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, etc. If the thickness of the peripheral wall 12 is too large, the peripheral wall 12 will occupy a large space inside the battery housing, resulting in a lower energy density of the cylindrical battery; if the thickness of the peripheral wall 12 is too small, the peripheral wall 12 is easily squeezed and deformed. In this exemplary embodiment, the thickness of the peripheral wall 12 is set to a suitable size, which can not only ensure the energy density of the cylindrical battery, but also reduce the risk of the peripheral wall 12 being squeezed and deformed.

[0029] In this exemplary embodiment, the tensile strength of the battery housing 1 is 800MPa-1500MPa. For example, the tensile strength of the battery housing 1 can be equal to 800Mpa, 850Mpa, 900Mpa, 950Mpa, 1000Mpa, 1050Mpa, 1100Mpa, 1150Mpa, 1200Mpa, 1250Mpa, 1300Mpa, 1350Mpa, 1400Mpa, 1450Mpa, 1500Mpa, etc. The tensile strength of the battery housing 1 can meet the strength of the battery housing and the resistance to battery cell expansion. It should be noted that the tensile strength of the battery housing 1 is the tensile strength of the battery housing 1 in any direction, which ensures the overall strength of the housing and the buffering of the battery cell expansion by the housing.

[0030] In this exemplary embodiment, the battery housing can be an aluminum housing, a steel housing, or the like. The steel housing has a relatively high strength. When the battery housing 1 is a steel housing, the peripheral wall 12 can satisfy the anti-deformation capability of the battery housing with a relatively small thickness. In this exemplary embodiment, the thickness of the peripheral wall 12 can be 0.25 mm to 0.55 mm. For example, the thickness of the steel shell peripheral wall 12 can be equal to 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, etc. This setting can reduce the thickness of the peripheral wall as much as possible, and at the same time can meet the deformation resistance of the peripheral wall when resisting the expansion of the battery cell.

[0031] In this exemplary embodiment, the hardness of the battery housing 1 is 100HRC-300HRC. For example, the hardness of the battery housing 1 can be equal to 100HRC, 110HRC, 120HRC, 130HRC, 140HRC, 150HRC, 160HRC, 170HRC, 180HRC, 190HRC, 200HRC, 210HRC, 220HRC, 230HRC, 240HRC, 250HRC, 260HRC, 270HRC, 280HRC, 290HRC, 300HRC, etc. If the hardness of the battery housing 1 is too small, the battery housing is easily scratched; if the hardness of the battery housing is too large, it is difficult to form explosion-proof notches and other structures on the battery housing. In this exemplary embodiment, the hardness of the battery housing 1 is set to a suitable size, which can reduce the risk of the battery housing being scratched and also facilitate the formation of explosion-proof notches and other structures on the battery housing.

[0032] In this exemplary embodiment, Figure 1-3 As shown, the cylindrical battery also includes: a core 2, which is located inside the battery shell 1, and the size of the core 2 in the axial direction of the cylindrical battery is L2, and L2 / L1 is 0.85-0.99. For example, L2 / L1 can be equal to 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc. If L2 / L1 is too large, the overall gas production of the battery will be serious, which will have a greater impact on the structural strength of the end wall; if L2 / L1 is too small, the ability of the surrounding wall to resist the pressure of the end wall is weak, and without the support of the core, the battery as a whole is prone to axial deformation. This exemplary embodiment sets L2 / L1 to a suitable value, which can not only ensure the structural strength of the end wall, but also improve the structural strength of the surrounding wall.

[0033] In the present exemplary embodiment, L2≤120 mm. L2 may be equal to 120 mm, 110 mm, 100 mm, 90 mm, 80 mm, 70 mm, 60 mm, 50 mm, 40 mm, 30 mm, 20 mm, etc.

[0034] In this exemplary embodiment, Figure 1-3 As shown, the winding core 2 includes: a winding core body 21, a positive electrode ear 221, and a negative electrode ear 222, and the positive electrode ear 221 and the negative electrode ear 222 are located on the same side of the winding core body 21. This arrangement can increase the overall proportion of the winding core inside the battery housing, ensure the strength of the winding core, and avoid the breakage of the ear.

[0035] The winding core body 21 may include a positive electrode sheet and a negative electrode sheet, the positive electrode sheet includes a positive electrode current collector layer and a positive electrode active material layer located on at least one side of the positive electrode current collector layer, and the negative electrode sheet includes a negative electrode current collector layer and a negative electrode active material layer located on at least one side of the negative electrode current collector layer. For example, the positive electrode active material of the lithium-ion battery may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium iron manganese, and the positive electrode current collector layer may be aluminum foil. The negative electrode active material may be graphite, silicon, etc., and the negative electrode current collector layer may be copper foil. During charging, lithium ions detach from the positive electrode active material, move to the negative electrode active material through the electrolyte, and the lithium ions are embedded in the interlayer gaps of the carbon material, completing the charging process of the battery. During discharge, lithium ions detach from the negative electrode active material, move to the positive electrode active material through the electrolyte, and complete the discharge process of the battery. The positive electrode tab is connected to the positive electrode collector layer in the positive electrode sheet, for example, the positive electrode tab can be formed by cutting the positive electrode collector layer material layer; the negative electrode tab is connected to the negative electrode collector layer in the negative electrode sheet, for example, the negative electrode tab can be formed by cutting the negative electrode collector layer material layer.

[0036] In this exemplary embodiment, the positive electrode tab 221 and the negative electrode tab 222 are arranged on the same side of the winding core body 21 . This arrangement can increase the proportion of positive and negative electrode sheets in the winding core, and can also improve the overall strength of the battery.

[0037] In this exemplary embodiment, the winding core 2 includes a pole piece, which includes a current collector layer and an active material layer, and the thickness of the current collector layer is ≥4μm. For example, the thickness of the current collector layer can be 4μm, 5μm, 6μm, 7μm, 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, etc. The current collector layer can support the active material layer. In this exemplary embodiment, the current collector layer is set to a larger thickness, so that the overall strength of the winding core 2 can be increased.

[0038] In this exemplary embodiment, Figure 1-3 As shown, the cylindrical battery may further include: an insulating film 5, the insulating film 5 is coated on at least part of the outer surface of the winding core 2, and the elastic modulus of the insulating film 5 is ≥1.2GPa. For example, the elastic modulus of the insulating film 5 may be equal to 1.2Gpa, 1.3GPa, 1.4GPa, 1.5GPa, 1.6GPa, 1.7GPa, 1.8GPa, 1.9GPa, 2Gpa, 2.1Gpa, 2.2Gpa, 2.3GPa, 2.4GPa, 2.5GPa, 2.6GPa, 2.7GPa, 2.8GPa, 2.9GPa, 3Gpa, etc. In this exemplary embodiment, the elastic modulus of the insulating film 5 is set to a larger value, so that the risk of deformation and detachment of the insulating film 5 can be reduced.

[0039] In this exemplary embodiment, Figure 1-3As shown, the winding core 2 includes end faces 24 arranged opposite to each other in the winding axis direction, and the end face area of ​​the winding core 2 is 1200 mm 2 -5100mm 2 For example, the end surface area of ​​the core 2 may be equal to 1200 mm 2 、1400mm 2 、1600mm 2 、1800mm 2 , 2000mm 2 、2200mm 2 、2400mm 2 、2600mm 2 、2800mm 2 、3000mm 2 、3200mm 2 、3400mm 2 、3600mm 2 、3800mm 2 , 4000mm 2 、4200mm 2 、4400mm 2 、4600mm 2 、4800mm 2 , 5000mm 2 、5100mm 2 Etc. If the end surface area of ​​the core 2 is too small, the energy density of the cylindrical battery is too low; if the end surface area of ​​the core 2 is too large, it is difficult for the electrolyte to enter the innermost part of the core 2, resulting in low charging and discharging efficiency of the core. In this exemplary embodiment, the end surface area of ​​the core 2 is set to an appropriate size, which can ensure the energy density of the core and improve the charging and discharging efficiency of the core.

[0040] In this exemplary embodiment, Figure 1-3As shown, the two end walls 11 include a first end wall 111, and the first end wall 111 is provided with a pole hole. The cylindrical battery also includes: a pole 6, and the pole 6 is partially provided in the pole hole. The pole 6 and the first end wall 111 form two voltage output ends of the cylindrical battery, and the pole 6 and the first end wall 111 have opposite polarities; the ratio of the area of ​​the positive projection of the pole 6 on the plane where the first end wall 111 is located to the area of ​​the first end wall 111 is 8%-35%, (d2*r) / (2d1*L1)≤0.78. For example, the ratio of the area of ​​the positive projection of the pole 6 on the plane where the first end wall 111 is located to the area of ​​the first end wall 111 can be equal to 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 35%, etc. (d2*r) / (2d1*L1) can be equal to 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.78, etc. On the one hand, this exemplary embodiment increases the area of ​​the positive projection of the pole 6 on the plane where the first end wall 111 is located to improve the overall impact resistance of the end wall, so the strength of the peripheral wall can also be increased accordingly to meet the axial compressive resistance. For example, this exemplary embodiment can set (d2*r) / (2d1*L1) to be less than or equal to 0.78 to improve the strength of the peripheral wall; at the same time, if the area of ​​the positive projection of the pole 6 on the plane where the first end wall 111 is located is too large, it will cause the current flow of the end wall and the pole to be unbalanced. This exemplary embodiment sets the area of ​​the positive projection of the pole 6 on the plane where the first end wall 111 is located to a suitable size, so that the current flow capacity between the pole 6 and the first end wall 111 can be relatively balanced, and the current density can be relatively uniform, thereby ensuring the current transmission rate and avoiding the problem of local overheating, thereby improving the safety performance of the cylindrical battery. It should be noted that the area of ​​the first end wall 111 does not include the area of ​​the pole hole.

[0041] This exemplary embodiment also provides a battery device, which includes the cylindrical battery described above. Figure 4 , which is a schematic diagram of the structure of an exemplary embodiment of the battery device disclosed in the present invention. The battery device may further include: a conductive bar 3, the conductive bar 3 is used to electrically connect at least two cylindrical batteries 10, and the conductive bar 3 is located on the side of the cylindrical battery 10 where the end wall 11 is provided. Figure 4 As shown, the axial direction of the cylindrical battery 10 can be perpendicular to the bottom plate 41 of the battery box, that is, the end wall 11 of the cylindrical battery is arranged parallel to the largest side of the bottom plate 41. The conductive bar 3 can be arranged on the side of the cylindrical battery 10 away from the bottom plate 41. It should be understood that in other exemplary embodiments, the conductive bar 3 can also be arranged on the side of the cylindrical battery 10 facing the bottom plate 41. The conductive bar 3 can be used to connect multiple cylindrical batteries in parallel, and can also be used to connect multiple cylindrical batteries in series.

[0042] like Figure 4 As shown, the battery device further includes: a battery box 4, the battery box 4 includes a bottom plate 41, and the cylindrical battery 10 can be fixedly connected to the bottom plate 41. This arrangement can prevent the cylindrical battery 10 from moving inside the battery box during use of the battery device, thereby causing the cylindrical battery and the conductive bar 3 to be disconnected.

[0043] In this exemplary embodiment, the cylindrical battery 10 and the bottom plate 41 can be bonded, and the bonding strength between the cylindrical battery 10 and the bottom plate 41 is 1MPa-15MPa, and (d2*S1) / (2d1*L1)≥0.08. For example, the bonding strength between the cylindrical battery 10 and the bottom plate 41 can be equal to 1Mpa, 2Mpa, 3Mpa, 4Mpa, 5Mpa, 6Mpa, 7Mpa, 8Mpa, 9Mpa, 10Mpa, 11Mpa, 12Mpa, 13Mpa, 14Mpa, 15Mpa, etc. (d2*S1) / (2d1*L1) can be equal to 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.85, etc. On the one hand, this exemplary embodiment can ensure the bonding strength between the end wall 11 and the bottom plate 41; on the other hand, too high bonding strength between the end wall 11 and the bottom plate 41 will lead to stress concentration on the end wall, thereby causing fracture between the end wall and the peripheral wall. This exemplary embodiment sets the bonding strength between the end wall 11 and the bottom plate 41 to an appropriate size, and can also improve the overall strength of the end wall, thereby ensuring the stability of the battery structure. The cylindrical battery 10 and the bottom plate 41 can be bonded by adhesives such as structural adhesives, foam adhesives, and thermal conductive adhesives. The bonding method can conveniently and quickly fix the cylindrical battery on the bottom plate 41.

[0044] 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.

[0045] 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.

[0046] In this exemplary embodiment, the battery device is a battery module or a battery pack.

[0047] 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.

[0048] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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: Cylindrical batteries include: A battery housing (1), the battery housing (1) comprising two end walls (11) arranged opposite to each other, and a peripheral wall (12) connected between the two end walls (11); The distance between the two end walls (11) is L1, the radius of the end wall (11) is r, the thickness of the peripheral wall (12) is d1, the thickness of the end wall (11) is d2, (d2*r) / (2d1*L1) is 0.05-0.85, and the radius of the end wall (11) is ≥19 mm.

2. The cylindrical battery according to claim 1, characterized in that: d2 / d1 is 1-4.

3. The cylindrical battery according to claim 1, characterized in that: The thickness of the peripheral wall (12) is 0.2 mm-0.6 mm.

4. The cylindrical battery according to claim 1, characterized in that: The tensile strength of the battery casing (1) is 800 MPa-1500 MPa.

5. The cylindrical battery according to claim 1, characterized in that: The battery housing (1) is a steel shell, and the thickness of the peripheral wall (12) is 0.25 mm-0.55 mm.

6. The cylindrical battery according to any one of claims 1 to 5, characterized in that: The cylindrical battery also includes: The winding core (2) is located inside the battery housing (1), and the dimension of the winding core (2) in the axial direction of the cylindrical battery is L2, and L2 / L1 is 0.85-0.

99.

7. The cylindrical battery according to claim 6, characterized in that: L2≤120mm.

8. The cylindrical battery according to claim 6, characterized in that: The winding core (2) comprises: Core body (21); Positive electrode lug (221); A negative electrode tab (222), wherein the positive electrode tab (221) and the negative electrode tab (222) are located on the same side of the winding core body (21).

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 (6), wherein the pole (6) is partially disposed in the pole hole, the pole (6) and the first end wall (111) form two voltage output ends of the cylindrical battery, and the pole (6) and the first end wall (111) have opposite polarities; The ratio of the area of ​​the orthographic projection of the pole (6) on the plane where the first end wall (111) is located to the area of ​​the first end wall (111) is 8%-35%, and (d2*r) / (2d1*L1)≤0.

78.

10. A battery device, characterized in that: The battery device comprises the cylindrical battery (10) according to any one of claims 1 to 9.

11. The battery device according to claim 10, characterized in that: include: A battery box (4), the battery box comprising a bottom plate (41), the cylindrical battery (10) being fixedly connected to the bottom plate (41), the end wall (11) being arranged parallel to the largest side surface of the bottom plate (41), the cylindrical battery (10) and the bottom plate (41) being bonded, the bonding strength between the cylindrical battery (10) and the bottom plate (41) being 1MPa-15MPa, and (d2*S1) / (2d1*L1)≥0.08.

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