Battery with cylindrical structure and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery with a cylindrical structure and electric equipment, the battery comprises a positive electrode cover plate, a negative electrode cover plate, a shell and a battery cell body; wherein the battery cell body is located in the shell, a core shaft extending in the axial direction of the battery cell body is arranged at the axial center position of the battery cell body, one end of the core shaft does not extend to the positive electrode cover plate, a mounting gap exists between the core shaft and the positive electrode cover plate, and the other end of the core shaft is fixedly connected with the negative electrode cover plate. According to the battery with the cylindrical structure, the heat dissipation effect in the battery cell body can be improved, the radial internal and external temperature difference of the battery is reduced, the mounting gap is reserved between the core shaft and the positive electrode cover plate, a mounting space is provided for a liquid injection hole, a riveting pin and other parts on the positive electrode cover plate, the available space at the upper part of the positive electrode cover plate is improved, and the space utilization rate of the battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery with a columnar structure and electrical equipment. Background Art

[0002] Existing batteries generally dissipate heat directly on the battery surface or by setting a liquid cooling plate at the bottom of the battery. However, for large cylindrical batteries, such as the 4680, 21700 and even larger diameter batteries that have appeared in recent years, these two heat dissipation methods only improve the heat dissipation on the battery surface, and the heat inside the battery cannot be effectively dissipated. Heat accumulates in the center of the battery, resulting in poor heat dissipation and affecting the battery's performance. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a battery and an electrical device having a cylindrical structure.

[0004] According to a first aspect of the utility model, a battery with a cylindrical structure is provided, the battery comprising a positive electrode cover plate, a negative electrode cover plate, a shell and a battery cell body; wherein the battery cell body is located in the shell, and a core shaft extending along its axial direction is provided at an axial center position of the battery cell body, one end of the core shaft does not extend to the positive electrode cover plate, and there is an installation gap between the core shaft and the positive electrode cover plate, and the other end of the core shaft is fixedly connected to the negative electrode cover plate.

[0005] According to the battery with a cylindrical structure provided by the utility model, a core shaft arranged inside the battery cell body is connected to the negative electrode cover plate, so that the heat inside the battery cell body is transferred to the negative electrode cover plate, the heat dissipation effect inside the battery cell body is improved, and the radial temperature difference between the inside and outside of the battery is reduced; and an installation gap is reserved between the core shaft and the positive electrode cover plate to provide installation space for components such as the liquid injection hole and the rivet pins on the positive electrode cover plate, thereby increasing the available space on the upper part of the positive electrode cover plate and improving the space utilization rate of the battery.

[0006] In addition, the battery with a cylindrical structure of the utility model may also have the following additional technical features:

[0007] Preferably, the height of the core shaft along its axial direction is greater than 2 / 3 of the height of the shell.

[0008] Preferably, the core shaft has a hollow cavity inside.

[0009] Preferably, both ends of the mandrel are closed ends, and the hollow cavity is filled with cooling liquid;

[0010] Alternatively, the end of the mandrel close to the positive electrode cover plate is a closed end, the end of the mandrel close to the negative electrode cover plate is an open end, the hollow cavity is connected to a cooling system through the open end, and the cooling system provides cooling liquid into the hollow cavity.

[0011] Preferably, the inner surface of the core shaft is provided with at least one first protrusion.

[0012] Preferably, the first protrusion includes at least one of a first protrusion, a first protrusion ring or a protrusion ridge.

[0013] Preferably, there are a plurality of ridges, and the plurality of ridges are circumferentially arranged on the inner surface of the core shaft; the ridges are extended along the axial direction of the core shaft, and the ridges are integrally formed with the core shaft.

[0014] Preferably, there are a plurality of first protrusions, and the plurality of first protrusions are arranged on the inner surface of the mandrel along the axial direction or / and the circumferential direction of the mandrel;

[0015] Alternatively, there are a plurality of first convex rings, and the plurality of first convex rings are distributed on the inner surface of the core shaft along the axial direction of the core shaft.

[0016] Preferably, at least one second protrusion is provided on a side of the negative electrode cover plate facing the core shaft, and the negative electrode ear of the battery cell body is fixedly connected to the second protrusion.

[0017] Preferably, the second protrusion includes a second convex block or a second convex ring.

[0018] Preferably, there are a plurality of second protrusions, and the plurality of second protrusions are circumferentially arranged on the negative electrode cover plate;

[0019] Alternatively, there are multiple second convex rings, and the multiple second convex rings are coaxially arranged.

[0020] Preferably, the battery is a cylindrical battery.

[0021] A second aspect of the present invention provides an electrical device, wherein the electrical device comprises a battery with a cylindrical structure as described in any embodiment of the present application.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 An exemplary structural diagram of a battery with a cylindrical structure provided in an embodiment of the present application;

[0025] Figure 2 An exploded view of a battery with a cylindrical structure provided in an embodiment of the present application;

[0026] Figure 3 A connection diagram of the mandrel and the negative electrode cover provided in an embodiment of the present application;

[0027] Figure 4 A cross-sectional view of a battery with a cylindrical structure provided in an embodiment of the present application;

[0028] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0029] Figure 6 for Figure 4 A partial enlarged view of point B in the middle;

[0030] Figure 7 Another exemplary structural diagram of the core shaft provided in an embodiment of the present application.

[0031] In the above figure: 100 battery; 110 positive electrode cover; 111 insulating sheet; 112 sealing ring; 113 riveted aluminum block; 114 positive electrode column; 115 injection hole; 116 upper plastic; 120 negative electrode cover; 121 second protrusion; 130 shell; 140 battery cell structure; 141 battery cell body; 142 core shaft; 1421 first protrusion. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0034] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0035] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0036] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to indicate that a specific feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0038] like Figure 1 and Figure 2 The exemplary structural schematic diagram of a battery 100 with a columnar structure provided in an embodiment of the present application is shown. A battery 100 with a columnar structure provided in an embodiment of the present application comprises a positive electrode cover plate 110, a negative electrode cover plate 120, a shell 130 and a battery cell body 141; wherein the battery cell body 141 is located in the shell 130, and the battery cell body 141 is provided with a core shaft 142 extending along its axial direction at an axial center position, one end of the core shaft 142 does not extend to the positive electrode cover plate 110, and there is an installation gap between the core shaft 142 and the positive electrode cover plate 110, and the other end of the core shaft 142 is fixedly connected to the negative electrode cover plate 120.

[0039] Specifically, Figure 1 and Figure 2 As shown, the battery with a cylindrical structure includes a positive electrode cover plate 110 and a negative electrode cover plate 120, wherein a shell 130 is circumferentially installed between the positive electrode cover plate 110 and the negative electrode cover plate 120, and a battery body 141 and an electrolyte are installed in the shell 130. The shell 130 can be made of stainless steel or aluminum, and the outer coating or spray painting is performed. Figure 4 and Figure 5As shown, the positive electrode cover plate 110 is a conventional component in this field, and is provided with an insulating sheet 111, a sealing ring 112, a riveted aluminum block 113, a positive electrode column 114, an injection hole 115, a grooved aluminum nail corresponding to the injection hole 115, and an upper plastic 116 and other conventional components. Exemplarily, a positive electrode post 114 is provided on the positive cover plate 110, a sealing ring 112 is provided between the positive electrode post 114 and the shell 130, and the positive electrode ear of the battery cell body 141 is connected to the positive electrode post 114 on the positive cover plate 110; an injection hole 115 is opened on the positive cover plate 110, and electrolyte is injected into the shell 130 of the battery 100 through the injection hole 115; an insulating sheet 111 is provided between the positive cover plate 110 and the shell 130 to prevent the positive and negative electrodes of the battery 100 from being connected, causing a short circuit of the battery 100, etc.; a notch is provided on the side of the positive cover plate 110 away from the negative cover plate 120 to realize the function of an explosion-proof valve, etc.

[0040] like Figures 2 to 4 As shown, a cell body 141 is assembled in the shell 130, wherein the cell body 141 is mainly composed of a positive electrode sheet, a separator and a negative electrode sheet wound together. A mandrel 142 extending along its axial direction is arranged inside the cell body 141 at the axial center position, and the mandrel 142 is located in the shell 130, and one end of the mandrel 142 extends toward the positive electrode cover plate 110, and the mandrel 142 does not extend to the positive electrode cover plate 110 so that there is an installation gap between the mandrel 142 and the positive electrode cover plate 110, and the installation gap provides installation space for the liquid injection hole 115 on the positive electrode cover plate 110, the riveting pins and other components, thereby increasing the available space on the upper part of the positive electrode cover plate 110 and improving the space utilization rate of the battery 100 with a cylindrical structure.

[0041] The other end of the mandrel 142 is fixedly connected to the negative electrode cover 120, wherein the mandrel 142 and the negative electrode cover 120 are vertically arranged, and the two can be fixedly connected by welding, screwing, riveting, etc. The mandrel 142 provides support for the interior of the battery cell body 141, and the battery cell body 141 can better fit on the surface of the mandrel 142, so that the pressing degree of the positive electrode plate, the isolation membrane and the negative electrode plate in the battery cell body 141 is consistent, reducing the risk of lithium precipitation. Among them, the mandrel 142 is connected to the negative electrode cover 120, and the negative electrode cover 120 is connected to the shell 130. When the wound battery cell vibrates radially, the edge of the negative electrode cover 120 can bear the impact force between the wound battery cell and the shell 130, avoiding the battery cell from shaking slightly, moving or colliding inside the shell 130 of the battery 100.

[0042] The core shaft 142 is a core shaft with heat conduction properties, such as graphene, silicone and other materials. By arranging the core shaft 142 with heat conduction properties inside the battery body 141, the core shaft 142 is used to transfer the heat inside the battery body 141 to the negative electrode cover 120, thereby increasing the heat dissipation area inside the battery 100, and using the core shaft 142 to better conduct the heat at the center of the battery body 141, effectively improving the heating condition inside the battery 100, enhancing the heat dissipation effect, avoiding excessively high temperature inside the battery body 141, reducing the radial temperature difference between the inside and outside of the battery 100, and improving the performance and life of the battery 100.

[0043] According to the battery 100 with a cylindrical structure provided by the utility model, the core shaft 142 arranged inside the battery body 141 is connected to the negative cover plate 120, so that the heat inside the battery body 141 is transferred to the negative cover plate 120, the heat dissipation effect inside the battery body 141 is improved, and the radial temperature difference between the inside and outside of the battery 100 is reduced; and an installation gap is reserved between the core shaft 142 and the positive cover plate 110, so as to provide installation space for components such as the injection hole 115 and the rivet pins on the positive cover plate 110, thereby increasing the available space on the upper part of the positive cover plate 110 and improving the space utilization rate of the battery 100.

[0044] In some embodiments, Figure 4 As shown, the height of the core shaft 142 along its axial direction is greater than 2 / 3 of the height of the housing 130 .

[0045] Specifically, the core shaft 142 is located in the shell 130, and an installation gap is reserved between the upper end of the core shaft 142 and the positive cover plate 110. The height of the installation gap is not greater than 1 / 3 of the height of the shell 130. It can ensure that the reserved installation gap provides installation space for components such as the injection hole 115 and the rivet pins on the positive cover plate 110, and can also ensure the heat conduction effect of the core shaft 142, thereby improving the heat dissipation inside the battery body 141.

[0046] In some embodiments, Figure 4 As shown, the core shaft 142 has a hollow cavity inside.

[0047] Specifically, the core shaft 142 can be a solid core shaft 142 or a hollow core shaft 142. The solid core shaft 142 facilitates the transfer of heat inside the battery cell body 141 to the negative electrode cover plate 120, which is beneficial to the heat dissipation inside the battery cell body 141. The solid core shaft 142 has a high strength and can provide a strong support force for the battery cell body 141. The hollow core shaft 142 refers to a core shaft 142 having a hollow cavity along its axial direction, which can provide storage space for the circulation of coolant, and the coolant is used to absorb the heat inside the battery cell body 141, further improving the heat dissipation effect inside the battery cell body 141.

[0048] In some embodiments, both ends of the core shaft 142 are closed ends, and the hollow cavity is filled with cooling liquid;

[0049] Alternatively, the end of the core shaft 142 close to the positive electrode cover plate 110 is a closed end, and the end of the core shaft 142 close to the negative electrode cover plate 120 is an open end, and the hollow cavity is connected to the cooling system through the open end, and the cooling system provides cooling liquid into the hollow cavity.

[0050] Specifically, when the core shaft 142 has a hollow cavity inside, there are two ways to fill the coolant in the hollow cavity of the core shaft 142. One is that both ends of the hollow cavity of the core shaft 142 are closed ends, and the coolant is pre-filled in the hollow cavity. In this way, the coolant cannot flow in the hollow cavity, and the heat absorption of the battery cell body 141 is limited; the other is that the end of the core shaft 142 close to the positive electrode cover plate 110 is a closed end, and the end close to the negative electrode cover plate 120 is an open end. The external cooling system is connected to the open end, and the coolant is provided to the hollow cavity of the core shaft 142 through the external cooling system. In this way, the coolant in the hollow cavity is in a flowing state, which can continuously absorb the heat inside the battery cell body 141, and further improve the heat dissipation effect inside the battery 100. Among them, the coolant is a commonly used coolant in the field, such as water.

[0051] Among them, the cooling system is a conventional system in this field. The cooling channel of the cooling system is connected to the open end of the hollow cavity. The cooling system injects coolant into the hollow cavity through the cooling channel to cool and dissipate heat inside the battery 100, improve the heating condition of the battery 100, and enhance the heat dissipation effect.

[0052] It should be noted that by providing a circulating coolant in the hollow cavity of the core shaft 142, since the coolant circulates in the hollow cavity, when the coolant absorbs the heat inside the battery cell body 141, the upper and lower temperature differences inside the battery 100 along its axial direction can be reduced, thereby further improving the performance of the battery 100.

[0053] In some embodiments, the inner surface of the core shaft 142 is provided with at least one first protrusion 1421 (eg Figure 6 shown).

[0054] Specifically, when the core shaft 142 has a hollow cavity inside, the inside of the core shaft 142 may be a smooth side wall (such as Figure 7 As shown), a first protrusion 1421 (as shown) may also be provided on the inner surface of the core shaft 142. Figure 4 and Figure 6As shown), the setting of the first protrusion 1421 can increase the contact area between the coolant and the inner surface of the core shaft 142, improve the heat exchange effect between the coolant and the core shaft 142, further improve the heat dissipation efficiency inside the battery cell body 141, and improve the radial internal and external temperature difference of the battery 100.

[0055] In some embodiments, the first protrusion 1421 includes at least one of a first protrusion, a first protrusion ring, or a protrusion ridge.

[0056] Specifically, the first protrusion 1421 can be implemented in a variety of ways, such as the first protrusion 1421 includes at least one of a first convex block, a first convex ring or a convex ridge, wherein the first convex block can be an arc-shaped, square-shaped or other protrusion, the first convex ring is a convex ring radially arranged along the inner surface of the core shaft 142, and the convex ridge is an ridge axially arranged along the inner surface of the core shaft 142. By arranging various forms of first protrusions 1421 on the inner surface of the core shaft 142, the contact area between the coolant and the inner surface of the core shaft 142 is further increased, thereby improving the heat dissipation efficiency inside the battery 100.

[0057] In some embodiments, Figure 4 and Figure 6 As shown, there are multiple ridges, and the multiple ridges are circumferentially arranged on the inner surface of the core shaft 142; the ridges are extended along the axial direction of the core shaft 142, and the ridges are integrally formed with the core shaft 142.

[0058] Specifically, the ridges are arranged on the inner surface of the mandrel 142 along the axial direction thereof, and there are multiple ridges, and the multiple ridges are evenly or unevenly arranged on the inner surface of the mandrel 142 in the circumferential direction. The arrangement of the multiple ridges further increases the contact area between the coolant and the inner surface of the mandrel 142, thereby improving the heat dissipation efficiency inside the battery 100. The extruded ridges inside the mandrel 142 are simple to process and have low production costs. The multiple ridges inside the mandrel 142 are used to increase the contact area between the coolant and the inner surface of the mandrel 142, thereby improving the heat exchange efficiency of the coolant and further improving the heat dissipation effect inside the battery 100.

[0059] In some embodiments, there are a plurality of first protrusions, and the plurality of first protrusions are disposed on the inner surface of the mandrel 142 along the axial direction or / and the circumferential direction of the mandrel 142;

[0060] Alternatively, there are multiple first convex rings, and the multiple first convex rings are distributed on the inner surface of the core shaft 142 along the axial direction of the core shaft 142 .

[0061] Specifically, multiple first protrusions are axially or / and circumferentially distributed on the inner surface of the core shaft 142, preferably evenly distributed on the inner surface of the core shaft 142, which can achieve uniform heat exchange between the coolant and the core shaft 142 at various positions, and improve the heat dissipation effect inside the battery cell body 141. Alternatively, multiple first convex rings are axially distributed on the inner surface of the core shaft 142, preferably evenly distributed on the inner surface of the core shaft 142, which can achieve uniform heat exchange between the coolant and the core shaft 142 at various positions, and improve the heat dissipation effect inside the battery cell body 141.

[0062] In some embodiments, Figure 2 , Figure 3 and Figure 7 As shown, at least one second protrusion 121 is provided on the side of the negative electrode cover plate 120 facing the core shaft 142 , and the negative electrode ear of the battery cell body 141 is fixedly connected to the second protrusion 121 .

[0063] Specifically, a second protrusion 121 is fixed to the side of the negative electrode cover 120 facing the core shaft 142, and the negative electrode ear of the battery cell body 141 is connected to the second protrusion 121. The setting of the second protrusion 121 enables the negative electrode ear of the battery cell body 141 to be better connected to the negative electrode cover 120. Since the negative electrode cover 120 is directly connected to the shell 130, the second protrusion 121 set on the negative electrode cover 120 can serve as a negative electrode busbar as a part of the shell 130, and there is no need to set up a negative electrode busbar separately, thereby reducing costs.

[0064] In some embodiments, the second protrusion 121 includes a second protrusion or a second protrusion ring.

[0065] Specifically, the second protrusion 121 may be a second bump (eg Figure 3 As shown) or the second convex ring, the second convex portion 121 provides a welding point between the negative ear of the battery body 141 and the negative cover plate 120, which is convenient for processing. Among them, the second convex ring is coaxially arranged with the core shaft 142, and the second convex ring is located outside the core shaft 142, which is convenient for the processing design of the second convex ring.

[0066] In some embodiments, there are multiple second protrusions, and the multiple second protrusions are circumferentially arranged on the negative electrode cover plate 120;

[0067] Alternatively, there are multiple second convex rings, and the multiple second convex rings are coaxially arranged.

[0068] Specifically, Figure 3As shown, the second protrusion may be an arc-shaped protrusion or a square protrusion, and a plurality of second protrusions are circumferentially arranged on the surface of the negative electrode cover plate 120, preferably evenly arranged on the surface of the negative electrode cover plate 120, and the welding strength between the negative electrode ear of the battery cell body 141 and the negative electrode cover plate 120 is increased by the plurality of second protrusions. The number of the second protrusions is not particularly limited in the present application, and for example, the number of the second protrusions is 2, 3, etc.

[0069] The second convex ring is an annular protrusion, and the second convex ring is coaxially arranged with the core shaft 142, and multiple second convex rings are coaxially arranged, and the welding strength between the negative ear of the battery cell body 141 and the negative electrode cover plate 120 is increased by multiple second convex rings. Among them, the application does not specifically limit the number of second convex rings, and for example, the number of second convex rings is 1, 2, 3, etc.

[0070] In some embodiments, the battery 100 is a cylindrical battery.

[0071] Specifically, the embodiment of the present application does not specifically limit the specific type, shape and size of the battery 100. For example, if the battery 100 is a cylindrical battery, the outer diameter of the cylindrical battery 100 is 21 mm and the height is 70 mm; or, the outer diameter of the cylindrical battery 100 is 46 mm and the height is 80 mm. The cylindrical battery can also be a lithium-ion battery, etc.

[0072] It is understandable that a plurality of batteries 100 form a battery pack, and the plurality of batteries 100 are connected in series or in parallel, and a liquid cooling plate is provided below the battery pack, and the liquid cooling plate may be a serpentine tube. When the core shaft 142 is used to conduct the heat inside the battery 100 to the negative electrode cover plate 120 at the bottom, the liquid cooling plate at the bottom can better control the temperature of the battery 100 monomer, so as to reduce the radial internal and external temperature difference of the battery 100 and the upper and lower temperatures in the axial direction, and improve the performance of the battery 100.

[0073] According to a third aspect of the present invention, there is provided an electrical device, wherein the electrical device comprises the battery cell structure 140 described in any embodiment of the present application, or comprises the battery 100 described in any embodiment of the present application.

[0074] Specifically, the specific technical features and technical effects of the electrical equipment provided in the embodiments of the present application and the specific technical features and technical effects of the cell structure 140 or the battery 100 are not repeated in the embodiments of the present application.

[0075] It should be pointed out that electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, etc. Vehicles may be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of the present invention do not impose any special restrictions on the above-mentioned electrical equipment.

[0076] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.

Claims

1. A battery (100) having a cylindrical structure, characterized in that: The battery (100) comprises a positive electrode cover plate (110), a negative electrode cover plate (120), a shell (130) and a battery cell body (141); wherein: The battery cell body (141) is located in the shell (130), and a core shaft (142) extending along its axial direction is provided at an axial center position of the battery cell body (141), one end of the core shaft (142) does not extend to the positive electrode cover plate (110), and there is a gap between the core shaft (142) and the positive electrode cover plate (110), and the other end of the core shaft (142) is fixedly connected to the negative electrode cover plate (120).

2. The battery (100) with a cylindrical structure according to claim 1, characterized in that: The height of the core shaft (142) along its axial direction is greater than 2 / 3 of the height of the shell (130).

3. The battery (100) with a cylindrical structure according to claim 1, characterized in that: The core shaft (142) has a hollow cavity inside.

4. The battery (100) with a cylindrical structure according to claim 3, characterized in that: Both ends of the core shaft (142) are closed ends, and the hollow cavity is filled with cooling liquid; Alternatively, the end of the core shaft (142) close to the positive electrode cover plate (110) is a closed end, and the end of the core shaft (142) close to the negative electrode cover plate (120) is an open end, and the hollow cavity is connected to a cooling system through the open end, and the cooling system provides cooling liquid into the hollow cavity.

5. The battery (100) with a cylindrical structure according to claim 4, characterized in that: The inner surface of the core shaft (142) is provided with at least one first protrusion (1421).

6. The battery (100) with a cylindrical structure according to claim 5, characterized in that: The first protrusion (1421) includes at least one of a first protrusion, a first protrusion ring or a protrusion ridge.

7. The battery (100) with a cylindrical structure according to claim 6, characterized in that: There are a plurality of ridges, and the plurality of ridges are circumferentially arranged on the inner surface of the core shaft (142); the ridges are extended along the axial direction of the core shaft (142), and the ridges are integrally formed with the core shaft (142).

8. The battery (100) with a cylindrical structure according to claim 6, characterized in that: There are a plurality of first protrusions, and the plurality of first protrusions are arranged on the inner surface of the core shaft (142) along the axial direction and / or the circumferential direction of the core shaft (142); Alternatively, there are a plurality of first convex rings, and the plurality of first convex rings are distributed on the inner surface of the core shaft (142) along the axial direction of the core shaft (142).

9. The battery (100) with a cylindrical structure according to claim 1, characterized in that: At least one second protrusion (121) is provided on the side of the negative electrode cover plate (120) facing the core shaft (142), and the negative electrode ear of the battery cell body (141) is fixedly connected to the second protrusion (121).

10. The battery (100) with a cylindrical structure according to claim 9, characterized in that: The second protruding portion (121) comprises a second protruding block or a second protruding ring.

11. The battery (100) with a cylindrical structure according to claim 10, characterized in that: There are a plurality of the second protrusions, and the plurality of the second protrusions are circumferentially arranged on the negative electrode cover plate (120); Alternatively, there are multiple second convex rings, and the multiple second convex rings are coaxially arranged.

12. The battery (100) with a cylindrical structure according to any one of claims 1 to 11, characterized in that: The battery (100) is a cylindrical battery.

13. An electrical equipment, characterized in that: The electrical device comprises a battery (100) with a cylindrical structure as claimed in any one of claims 1 to 12.

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