Ring-shaped battery, battery module, and electric device

Abstract

Disclosed are a ring-shaped battery, a battery module, and an electric device. The ring-shaped battery comprises a battery case (1), wherein the battery case (1) comprises an outer peripheral wall (13) and an inner peripheral wall (12) which runs through the inside of the outer peripheral wall (13), the maximum straight-line distance between any two points on the cross-section of the inner peripheral wall (12) being 0.11-0.65 times the maximum straight-line distance between any two points on the cross-section of the outer peripheral wall (13). The ring-shaped battery using said structure has improved heat dissipation performance.

Description

Ring batteries, battery modules and electrical equipment

[0001] This application is based on Chinese patent applications with application number 202322294206.7 and application date August 25, 2023, and application number 202322491461.0 and application date September 13, 2023, and claims the priority of these two Chinese patent applications. The entire contents of the two Chinese patent applications are hereby introduced into this application as a reference. Technical Field

[0002] The utility model belongs to the technical field of lithium batteries, and specifically relates to a ring-shaped battery, a battery module and electrical equipment. Background Art

[0003] Lithium-ion batteries have the advantages of light weight, high energy density, long cycle life and high safety performance, and have become the mainstream battery.

[0004] The main forms of lithium-ion batteries are prismatic, cylindrical, and pouch cells. Cylindrical batteries offer a high degree of automation, high production efficiency, good consistency, and relatively low cost.

[0005] At present, cylindrical batteries basically adopt a fully closed structure. As the energy density and power density of lithium-ion batteries become higher and higher, the charge and discharge rates are also getting larger and larger, and the heat generation rate of the battery is also increasing accordingly. However, due to the poor radial thermal conductivity of cylindrical batteries, the battery size is limited, and the battery electrical performance and safety performance are reduced.

[0006] Utility Model Content

[0007] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a ring-shaped battery, a battery module, and an electrical device, at least for improving the heat dissipation performance of the battery.

[0008] In a first aspect, the present invention provides a ring-shaped battery, comprising: a battery shell, the battery shell comprising an outer peripheral wall and an inner peripheral wall passing through the outer peripheral wall, the maximum straight-line distance between any two points on the cross section of the inner peripheral wall being 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer peripheral wall.

[0009] As an implementation method, a first hole is provided on the inner circumferential wall, and the first hole extends along the axis of the inner circumferential wall. The maximum straight-line distance between any two points on the cross section of the first hole is 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer circumferential wall.

[0010] As an implementable manner, the maximum straight-line distance between any two points on the cross section of the first hole is 5 mm to 30 mm.

[0011] As an implementable manner, the maximum straight-line distance between any two points on the cross section of the first hole is 8 mm to 25 mm.

[0012] As an implementable manner, the maximum straight-line distance between any two points on the cross section of the first hole is 10 mm to 15 mm.

[0013] As an implementable manner, a plurality of heat dissipation protrusions are provided on the hole wall of the first hole.

[0014] As an implementation manner, both ends of the first hole are open or one end is open.

[0015] As an implementable manner, each of the heat dissipation protrusions is an annular protrusion arranged around the hole wall, or a point-shaped protrusion or a columnar protrusion uniformly distributed on the hole wall.

[0016] As an implementation method, the annular battery further includes an annular battery core, which is sleeved on the outside of the inner circumferential wall, and an insulating member is provided between the outer side surface of the inner circumferential wall and the inner side surface of the annular battery core.

[0017] As an implementation method, the insulating member includes a layered structure covering the outer side surface of the inner peripheral wall; or,

[0018] The insulating member includes an annular structure provided at at least one end of the inner peripheral wall.

[0019] As an implementation method, end covers are respectively provided at both ends of the outer peripheral wall, and the annular battery further includes an annular battery core;

[0020] One of the end caps is provided with a positive electrode column and a negative electrode column, the positive electrode tab of the annular battery core is electrically connected to the positive electrode column, and the negative electrode tab of the annular battery core is electrically connected to the negative electrode column; or,

[0021] One of the end caps is provided with a positive pole, and the other end cap is provided with a negative pole; the positive pole tab at one end of the annular battery core is electrically connected to the positive pole, and the negative pole tab at the other end of the annular battery core is electrically connected to the negative pole.

[0022] As an implementation manner, the cross section of the outer peripheral wall and / or the inner peripheral wall is a circle, a regular polygon, an ellipse or a non-equilateral polygon.

[0023] As an implementation manner, the cross section of the first hole is a circle, a regular polygon, an ellipse or a non-equilateral polygon.

[0024] As an implementation manner, the cross section of the toroidal core is a circle, a regular polygon, an ellipse or a non-equilateral polygon.

[0025] In a second aspect, the present invention provides a battery module comprising a plurality of annular batteries as described above, wherein the plurality of annular batteries are connected in series and / or in parallel.

[0026] In a third aspect, the present invention provides an electrical device comprising a plurality of annular batteries as described above; or comprising the battery module described above.

[0027] In the above scheme, the maximum straight-line distance between any two points on the cross section of the inner peripheral wall is 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer peripheral wall of the battery housing. This allows the cooling medium to pass through the heat dissipation channel (i.e., the first hole) of the inner peripheral wall to dissipate heat to the middle part of the annular battery. Compared with heat dissipation by relying solely on the outer peripheral surface of the battery, the heat dissipation performance is improved. On the basis of the improved heat dissipation performance, the battery size can be further increased. In addition, the temperature of the annular battery of this scheme will not reach high temperature due to poor heat dissipation, so that the annular battery of this scheme can operate in a more ideal temperature environment. The activity of the active material in the annular battery is high, so the electrical performance of the annular battery can be improved. In addition, since the annular battery does not have the problem of high temperature, the problem of battery combustion or even explosion due to high temperature is avoided, thereby improving safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0029] FIG1 is a perspective view of a ring-shaped battery provided in an embodiment of the present invention;

[0030] FIG2 is a top view of FIG1 ;

[0031] FIG3 is a cross-sectional view of the AA portion of FIG2;

[0032] FIG4 is a cross-sectional view corresponding to the portion taken along the line 2A-A of FIG2A;

[0033] FIG5 is a cross-sectional view corresponding to the portion taken along the line 2A-A of FIG2A;

[0034] FIG6 is a perspective view of a ring-shaped battery provided in another embodiment of the present invention (end caps not shown);

[0035] FIG7 is a perspective view of a ring-shaped battery provided in another embodiment of the present invention;

[0036] FIG8 is an exploded view of a ring-shaped battery provided by another embodiment of the present invention;

[0037] FIG9 is a schematic structural diagram of a toroidal battery provided by another embodiment of the present invention, wherein the positive and negative tabs of the toroidal battery core are not flattened;

[0038] FIG10 is a schematic diagram of the structure corresponding to FIG9 after the positive electrode ear and the negative electrode ear are flattened;

[0039] FIG11 is a top view of a toroidal battery cell provided in another embodiment of the present invention;

[0040] FIG12 is a cross-sectional view of the BB portion of FIG11;

[0041] FIG13 is a cross-sectional view of the CC portion of FIG11;

[0042] FIG14 is a schematic structural diagram of an end cover provided in another embodiment of the present invention.

[0043] Description of reference numerals:

[0044] Battery housing 1, end cap 11, positive electrode column 111, negative electrode column 112, injection hole 113, explosion-proof valve 114, hole 115, inner peripheral wall 12, first hole 121, heat dissipation protrusion 122, outer peripheral wall 13;

[0045] Ring-shaped battery core 2, positive electrode ear 21, negative electrode ear 22, center hole 23;

[0046] Insulation layer 3;

[0047] Ring structure 4. DETAILED DESCRIPTION

[0048] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant utility model and are not intended to limit the utility model. It should also be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings.

[0049] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0050] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a," "the," and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

[0051] As shown in Figures 1 to 3, the annular battery provided in an embodiment of the present invention includes: a battery housing 1, wherein the battery housing 1 includes an outer peripheral wall 13 and an inner peripheral wall 12 passing through the outer peripheral wall 13, and the maximum straight-line distance between any two points on the cross section of the inner peripheral wall 12 is 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer peripheral wall 13.

[0052] The material of the battery housing 1 is, for example but not limited to, steel, aluminum alloy, etc.

[0053] The battery case 1 includes an outer peripheral wall 13 and an inner peripheral wall 12 extending within the outer peripheral wall 13. A cavity for accommodating a battery cell is formed between the outer side of the inner peripheral wall 12 and the inner side of the outer peripheral wall 13. The battery cell is encapsulated within the cavity. The battery case 1 is used to protect the encapsulated battery cell.

[0054] In order to adapt to the structure of the above-mentioned battery shell 1, the battery cell encapsulated in the above-mentioned cavity is a ring-shaped battery cell 2, which can be prepared by winding. For example, the positive electrode film roll coated with the positive electrode material, the negative electrode film roll coated with the negative electrode material, and the diaphragm roll are respectively provided to the battery cell winding equipment, and the battery cell winding equipment stacks the positive electrode film drawn from the positive electrode film roll, the negative electrode film drawn from the negative electrode film roll, and the diaphragm drawn from the diaphragm roll together, and the diaphragm is located between the positive electrode film and the negative electrode film, and the three are wound to form a ring-shaped battery cell 2 with a central hole 23 in the middle (see at least Figures 11 to 13). After the ring-shaped battery cell 2 is encapsulated in the above-mentioned cavity, the inner peripheral wall 12 passes through the central hole 23.

[0055] In addition, in order to ensure that the inner wall 12 and the annular battery core 2 are in a good insulation state, an insulating member can be provided between the outer side surface of the inner wall 12 and the inner side surface of the annular battery core 2 to isolate the inner wall 12 and the annular battery core 2, thereby avoiding electrical connection between the two and causing problems such as leakage and short circuit of the annular battery.

[0056] Among them, at least referring to Figure 3, the insulating part may include a layered structure 3 coated on the outer side of the inner circumferential wall 12; in other examples, at least referring to Figure 6, the insulating part may also include an annular structure 4, which is arranged at at least one end of the inner circumferential wall 12.

[0057] Among them, in the example of Figure 6, the two ends of the toroidal battery core 2 have tabs, and accordingly, the annular structure 4 is set at both ends of the inner circumferential wall 12; in other examples, if one end of the toroidal battery core 2 has a tab, the annular structure 4 is set at one end of the inner circumferential wall 12, and the annular structure 4 is set at one end of the tab of the toroidal battery core 2.

[0058] The annular battery of the present application may have an outer shape of a cylinder, a regular polygonal column, an elliptical column, a non-equilateral polygonal column, etc. Among them, the outer shape of the annular battery shown in Figure 1 is a cylinder, and the outer shape of the annular battery shown in Figure 7 is a regular polygonal column, and it is a regular hexagonal column. Of course, in other examples, it can also be a regular polygonal column with other numbers of sides, such as a regular pentagonal column, a regular octagonal column, etc. Specifically, the cross-section of the outer peripheral wall 13 can be a circle, a regular polygon, an elliptical or a non-equilateral polygon. Correspondingly, the cross-section of the inner peripheral wall 12 can also be a circle, a regular polygon, an elliptical or a non-equilateral polygon. The cross-section of the first hole 121 can also be a circle, a regular polygon, an elliptical or a non-equilateral polygon. The cross-section of the annular battery core 2 can also be a circle, a regular polygon, an elliptical or a non-equilateral polygon.

[0059] The cross section described herein is a cross section perpendicular to the axis of the inner peripheral wall 12 .

[0060] Among them, the maximum straight-line distance between any two points on the cross section can be understood as follows: when the cross section is a circle, the maximum straight-line distance between any two points on the cross section can refer to the diameter of the circle; when the cross section is an ellipse, the maximum straight-line distance between any two points on the cross section can refer to the major axis of the ellipse; when the cross section is a polygon, the maximum straight-line distance between any two points on the cross section can refer to the maximum distance between any two vertices of the polygon.

[0061] For example, in the example of Figure 1, the cross-section of the outer peripheral wall 13 is circular, and a first hole 121 is provided on the inner peripheral wall 12, and the first hole 121 extends along the axis of the inner peripheral wall 12. The first hole 121 of the inner peripheral wall 12 is a circular hole, then the maximum straight-line distance between any two points on the cross-section of the first hole 121 is 0.11-0.65 of the maximum straight-line distance between any two points on the cross-section of the outer peripheral wall 13 of the battery casing 1, that is, the diameter of the first hole 121 is 0.11-0.65 of the outer diameter of the outer peripheral wall 13.

[0062] In the above scheme, by providing a first hole 121 on the inner peripheral wall 12, and the maximum straight-line distance between any two points on the cross section of the first hole 121 is 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer peripheral wall 13 of the battery housing 1, the cooling medium can pass through the first hole 121 to dissipate heat to the middle part of the annular battery. Compared with heat dissipation by relying solely on the outer peripheral surface of the battery, the heat dissipation performance is improved. On the basis of the improved heat dissipation performance, the battery size can be further increased. In addition, the temperature of the annular battery of this scheme will not reach high temperature due to poor heat dissipation, so that the annular battery of this scheme can operate in a more ideal temperature environment. The activity of the active material in the annular battery is high, so the electrical performance of the annular battery can be improved. In addition, since the annular battery does not have the problem of high temperature, the problem of battery combustion or even explosion due to high temperature is avoided, thereby improving the safety performance.

[0063] In addition, by setting the maximum straight-line distance between any two points on the cross section of the first hole 121 to 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer wall 13 of the battery housing 1, within this range, a cavity large enough to accommodate the battery cell can be formed between the outer side surface of the inner wall 12 and the inner side surface of the outer wall 13, thereby ensuring the energy density of the annular battery and better dissipating heat in the middle of the annular battery. In addition, although when the first hole 121 is provided on the inner circumferential wall 12, the outer diameter of the inner circumferential wall 12 is slightly larger than when the first hole 121 is not provided, since there is a gap between the inner circumferential wall 12 itself and the battery cell, even if the outer diameter of the inner circumferential wall 12 becomes larger, it can occupy a part of the gap without occupying the space of the battery cell. In other words, the size of the battery cell can remain unchanged. As for an extreme case, the outer diameter of the inner circumferential wall 12 occupies a part of the space of the battery cell, and the amount of occupation is also very small, generally about 3%. At this time, the energy density loss of the battery cell is only about 3%. This large energy density loss can be ignored compared to the yield of improved battery electrical performance brought about by improved heat dissipation capacity.

[0064] As an implementable manner, the maximum straight-line distance between any two points on the cross section of the first hole 121 is 5 mm to 30 mm.

[0065] As an implementable manner, the maximum straight-line distance between any two points on the cross section of the first hole 121 is 8 mm to 25 mm.

[0066] As an implementable manner, the maximum straight-line distance between any two points on the cross section of the first hole 121 is 10 mm to 15 mm.

[0067] For example, but not limited to, the maximum straight-line distance between any two points on the cross section of the first hole 121 is 5.15 mm, 5.3 mm, 6.25 mm, 7 mm, 8.66 mm, 13 mm, 15.35 mm, 18.7 mm, 19 mm, 22.9 mm, 24 mm, 28.4 mm, 29.46 mm, etc. The maximum straight-line distance between any two points on the cross section of the first hole 121 can be determined according to actual needs, as long as the maximum straight-line distance between any two points on the cross section of the first hole 121 is 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer peripheral wall 13 of the battery casing 1. In addition, generally, the longer the length of the annular battery, the larger the maximum value of the straight-line distance between any two points on the cross section of the first hole 121 can be, that is, the maximum value of the straight-line distance between any two points on the cross section of the first hole 121 is positively correlated with the length of the annular battery, so that the cooling medium can fully exchange heat in the first hole 121, so as to take away the heat from the center of the annular battery as much as possible, thereby improving the heat dissipation effect of the annular battery.

[0068] The cooling medium may be gas or liquid. Preferably, liquid is used to dissipate heat from the annular battery to improve heat dissipation performance.

[0069] In addition, it should be noted that both ends of the first hole 121 are open, that is, the first hole 121 is a through hole, at least as shown in Figure 3; or, one end of the first hole 121 is open, that is, the first hole 121 is open at one end and closed at the other end. For example, referring to at least Figure 4, the first hole 121 is a blind hole, then one end is open and the other end is closed; or, referring to at least Figure 5, the first hole 121 can be a through hole, one end of which is closed by other components, such as the end cover 11.

[0070] As an achievable approach, referring at least to FIG3 , to enhance the heat dissipation capability of the annular battery, a plurality of heat dissipation protrusions 122 are provided on the wall of the first hole 121. By providing a plurality of heat dissipation protrusions 122 on the wall of the first hole 121, the surface area of ​​the wall of the first hole 121 is increased. As the surface area increases, the area in contact with the cooling medium also increases, and the area for heat exchange increases accordingly. Heat in the center of the annular battery can be fully exchanged with the cooling medium flowing through the first hole 121, removing heat from the center of the annular battery and reducing the temperature of the annular battery during charging and discharging.

[0071] As an implementation, each heat dissipation protrusion 122 is an annular protrusion disposed around the hole wall. Dissipation protrusions 122 are provided as an annular protrusion surrounding the hole wall, which can evenly dissipate heat around the hole wall. Of course, it is understood that each heat dissipation protrusion 122 can also be a dot-shaped protrusion, a columnar protrusion, or a protrusion of another shape evenly distributed on the hole wall to achieve the purpose of even heat dissipation.

[0072] As an implementation method, end caps 11 are respectively provided at both ends of the outer peripheral wall 13;

[0073] Generally, the end caps 11 can be sealed and connected to the outer peripheral wall 13 by welding to prevent leakage of the electrolyte. Of course, in other examples, other connection methods such as riveting and crimping can also be used to fix the end caps 11 to the two ends of the battery case 1. In addition, one of the end caps 11 can also be an integral structure with the outer peripheral wall 13, at least as shown in Figure 5.

[0074] At least as shown in FIG. 14 , each end cover 11 is provided with a hole 115 exposing the first hole 121 .

[0075] In one implementation, referring at least to Figures 3 and 9-13, the annular battery can have tabs on the same side, that is, a positive electrode column 111 and a negative electrode column 112 are provided on one of the end covers 11, and an annular battery cell 2 is encapsulated in the battery shell 1, and a positive tab 21 and a negative tab 22 are provided at the same end of the annular battery cell 2, the positive tab 21 is electrically connected to the positive electrode column 111, and the negative tab 22 is electrically connected to the negative electrode column 112.

[0076] Generally, after the annular battery core 2 is wound and formed, its positive electrode ear 21 and negative electrode ear 22 are still in a sheet structure. In order to electrically connect the positive electrode ear 21 and negative electrode ear 22 with their corresponding positive electrode column 111 and negative electrode column 112, before or after the annular battery core 2 is installed in the battery shell 1, pressure can be applied to the positive electrode ear 21 and negative electrode ear 22 axially along the inner circumferential wall 12 to deform the positive electrode ear 21 and negative electrode ear 22 (this process can be called flattening) so that the positive electrode ear 21 and negative electrode ear 22 form a flat surface in surface contact with the corresponding positive electrode column 111 and negative electrode column 112. Through surface contact, the welding strength between the positive electrode ear 21 and the positive electrode column 111, and between the negative electrode ear 22 and the negative electrode column 112 can be improved, and the connection resistance between the positive electrode ear 21 and the positive electrode column 111, and the connection resistance between the negative electrode ear 22 and the negative electrode column 112 can be reduced.

[0077] The welding referred to herein may be, but is not limited to, laser welding, ultrasonic welding, resistance welding, electromagnetic welding, friction welding, electric resistance welding, and the like.

[0078] In another implementation, at least referring to Figure 8, the annular battery can have pole ears on both sides, that is, a positive pole column 111 is provided on one of the end covers 11, and a negative pole column 112 is provided on the other end cover 11. In this example, two positive pole columns 111 and two negative pole columns 112 are provided; an annular battery cell 2 is encapsulated in the battery shell 1, and a positive pole ear 21 is provided at one end of the annular battery cell 2, and a negative pole ear 22 is provided at the other end. The positive pole ear 21 is electrically connected to the positive pole column 111, and the negative pole ear 22 is electrically connected to the negative pole column 112.

[0079] The end of the inner peripheral wall 12 may be flush with the corresponding end cover 11 or may protrude from the corresponding end cover 11 .

[0080] In some examples, as also shown in at least FIG14 , an explosion-proof valve 114 and a liquid injection hole 113 can be provided on the end cap 11, and electrolyte can be injected into the annular battery through the liquid injection hole 113. During the formation process after the electrolyte is injected, the liquid injection hole 113 can serve as a vent for discharging gas generated by the formation from the battery housing 1. After the formation is completed, the liquid injection hole 113 is sealed, for example, but not limited to, by welding a sealing nail into the liquid injection hole 113.

[0081] For annular batteries with positive and negative electrodes located at both ends of the battery, the structures of the end caps 11 provided at both ends may be the same or different. For example, but not limited to, the end cap 11 on the positive electrode side may be provided with an explosion-proof valve 114 and a liquid injection hole 113, while the end cap 11 on the negative electrode side may be provided with a liquid injection hole 113 but not an explosion-proof valve 114.

[0082] In a second aspect, the present invention provides a battery module comprising a plurality of annular batteries as described above, wherein the plurality of annular batteries are connected in series and / or in parallel.

[0083] The number of ring batteries used and their series-parallel relationship can be determined based on the output voltage and capacity of the battery module.

[0084] In a third aspect, the present invention provides an electrical device comprising a plurality of annular batteries as described above; or comprising the battery module described above.

[0085] Electrical equipment includes, but is not limited to, new energy vehicles (electric vehicles, hybrid vehicles, etc.), digital products, etc.

[0086] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0087] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A ring-shaped battery, characterized in that: include: A battery housing (1), the battery housing (1) comprising an outer peripheral wall (13) and an inner peripheral wall (12) penetrating the outer peripheral wall (13), wherein the maximum straight-line distance between any two points on the cross section of the inner peripheral wall (12) is 0.11-0.65 of the maximum straight-line distance between any two points on the cross section of the outer peripheral wall (13).

2. The annular battery according to claim 1, characterized in that: The inner peripheral wall (12) is provided with a first hole (121), the first hole (121) extending along the axis of the inner peripheral wall (12), and the maximum value of the straight-line distance between any two points on the cross section of the first hole (121) is 0.11-0.65 of the maximum value of the straight-line distance between any two points on the cross section of the outer peripheral wall (13).

3. The annular battery according to claim 2, characterized in that: The maximum value of the straight-line distance between any two points on the cross section of the first hole (121) is 5 mm to 30 mm.

4. The annular battery according to claim 3, characterized in that: The maximum value of the straight-line distance between any two points on the cross section of the first hole (121) is 8 mm to 25 mm.

5. The annular battery according to claim 4, characterized in that: The maximum value of the straight-line distance between any two points on the cross section of the first hole (121) is 10 mm to 15 mm.

6. The annular battery according to any one of claims 2 to 5, characterized in that: Both ends of the first hole (121) are open or one end is open.

7. The annular battery according to any one of claims 2 to 5, characterized in that: A plurality of heat dissipation protrusions (122) are arranged on the hole wall of the first hole (121).

8. The annular battery according to claim 7, characterized in that: Each of the heat dissipation protrusions (122) is an annular protrusion arranged around the hole wall, or a dot-shaped protrusion or a columnar protrusion evenly distributed on the hole wall.

9. The annular battery according to any one of claims 2 to 5, characterized in that: The annular battery further comprises an annular battery core (2), wherein the annular battery core (2) is sleeved on the outside of the inner peripheral wall (12), and an insulating member is provided between the outer side surface of the inner peripheral wall (12) and the inner side surface of the annular battery core (2).

10. The annular battery according to claim 9, characterized in that: The insulating member comprises a layered structure (3) coated on the outer side of the inner peripheral wall (12); or, The insulating member comprises an annular structure (4) arranged at at least one end of the inner peripheral wall (12).

11. The annular battery according to any one of claims 2 to 5, characterized in that: End covers (11) are respectively provided at both ends of the outer peripheral wall (13), and the annular battery further comprises an annular battery core (2); A positive electrode column (111) and a negative electrode column (112) are provided on one of the end covers (11), the positive electrode ear (21) of the annular battery cell (2) is electrically connected to the positive electrode column (111), and the negative electrode ear (22) of the annular battery cell (2) is electrically connected to the negative electrode column (112); or, A positive pole (111) is provided on one of the end covers (11), and a negative pole (112) is provided on the other end cover (11); a positive pole ear (21) at one end of the annular battery cell (2) is electrically connected to the positive pole (111), and a negative pole ear (22) at the other end of the annular battery cell (2) is electrically connected to the negative pole (112).

12. The annular battery according to any one of claims 2 to 5, characterized in that: The cross section of the outer peripheral wall (13) and / or the inner peripheral wall (12) is circular, regular polygonal, elliptical or non-equilateral polygonal.

13. The annular battery according to claim 12, characterized in that: The cross section of the first hole (121) is circular, regular polygonal, elliptical or non-equilateral polygonal.

14. The annular battery according to claim 9, characterized in that: The cross section of the annular battery core (2) is in the shape of a circle, a regular polygon, an ellipse or a non-equilateral polygon.

15. A battery module, characterized in that: The invention comprises a plurality of annular batteries according to any one of claims 1 to 14, wherein the plurality of annular batteries are connected in series and / or in parallel.

16. An electrical equipment, characterized in that: Comprising a plurality of annular batteries as described in any one of claims 1 to 14; or, comprising the battery module as described in claim 15.

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