Cylindrical battery and electric equipment

Abstract

The utility model relates to a cylindrical battery and electric equipment, and relates to the technical field of batteries. The cylindrical battery comprises a shell, a roll core and a heat absorption sealing nail, a containing cavity is formed in the shell, the winding core is arranged in the containing cavity, and a winding needle cavity is formed in the middle of the winding core in the axial direction. And the heat absorption sealing nail is arranged in the winding needle cavity. Wherein the heat absorption sealing nail is of a hollow structure, a cooling cavity is formed in the heat absorption sealing nail, and a phase change material is arranged in the cooling cavity. The cylindrical battery provided by the utility model can solve the problem that the service life of the battery cell is influenced and even fire and explosion are caused by heat accumulation in the center position of the cylindrical battery in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cylindrical battery and an electric device. BACKGROUND

[0002] During use of the power battery, heat is generated in the battery due to electrochemical reactions and other factors. In order to avoid the heat affecting the use of the power battery, the existing technology usually uses a liquid cooling plate cooling or air cooling method to cool the battery cell.

[0003] However, when the above heat dissipation structure is used, whether the liquid cooling plate cooling or the air cooling, the cooling medium can only contact the outer wall of the battery cell. At this time, heat aggregation is likely to occur at the center of the battery cell, especially in a cylindrical battery.

[0004] When the battery cell is under the action of high-power output working conditions and other factors, the heat generation of the battery cell is intensified, and the heat aggregation at the center of the battery cell is more serious. At this time, it may not only cause the center material of the battery cell to overreact, thereby damaging the performance of the battery cell material and affecting the service life of the battery cell, but also may cause the battery cell to catch fire or even explode. CONTENT OF THE UTILITY MODEL

[0005] The purpose of the present application is to provide a cylindrical battery and an electric device, which can solve the problem that the center of the cylindrical battery in the prior art is prone to heat aggregation, affecting the service life of the battery cell, and even causing fire or explosion.

[0006] In order to achieve the above purpose, the first aspect of the present application provides a cylindrical battery, which comprises a shell, a winding core and a heat-absorbing sealing nail. The shell is internally provided with a receiving cavity, the winding core is arranged in the receiving cavity, and a winding needle cavity is formed in the middle of the winding core along the axial direction. The heat-absorbing sealing nail is arranged in the winding needle cavity. The heat-absorbing sealing nail is arranged as a hollow structure to form a cooling cavity inside, and a phase change material is arranged in the cooling cavity.

[0007] Based on the above embodiments of the present application, when the cylindrical battery is in use, the heat absorption sealing nail is arranged in the winding core middle position, and the phase change material is arranged in the heat absorption sealing nail. When the cylindrical battery abnormally heats up, the temperature of the battery center position will rapidly rise due to heat accumulation. At this time, the phase change material arranged in the heat absorption sealing nail can absorb heat through phase change, thereby reducing the temperature of the battery center position, avoiding the problems of excessively high temperature of the battery center position and excessively large temperature difference between the center position and the outer side of the battery cell, thereby prolonging the service life of the battery and reducing or even avoiding the risk of fire or explosion of the battery. At the same time, the sealing nail is a commonly used structure for sealing the liquid injection opening in the cylindrical battery. The above structure is improved to form the heat absorption sealing nail in the present application, which increases the heat absorption effect without affecting the original sealing effect of the sealing nail. Therefore, it can reduce the problem of excessive occupation of the internal space of the cylindrical battery caused by the arrangement of other structures, that is, it can reduce the occupation of the internal space of the cylindrical battery to a certain extent and reduce the production and processing cost, thereby ensuring the energy density of the cylindrical battery.

[0008] In some embodiments, the heat absorption sealing nail comprises a barrel portion and a sealing portion, the barrel portion is open at one end and forms a cooling cavity in the barrel portion, and the sealing portion is arranged at the open end of the barrel portion.

[0009] Based on the above embodiments of the present application, the barrel portion is arranged to form a cooling cavity to accommodate the phase change material. The barrel portion is open at one end to facilitate the injection of the phase change material into the cooling cavity, thereby realizing the heat absorption effect of the heat absorption sealing nail. The sealing portion arranged at the open end of the barrel portion can be used to seal the liquid injection position of the battery, thereby achieving the sealing effect and avoiding problems such as electrolyte leakage at the liquid injection position, prolonging the service life of the cylindrical battery, and improving the safety during use.

[0010] In some embodiments, the size of the barrel portion along the axial direction of the winding core is H1, the size of the shell along the axial direction of the winding core is H2, and 0.4H2≤H1≤0.9H2.

[0011] Based on the above embodiments of the present application, when the cylindrical battery is vertically arranged along the axial direction, the size of the barrel portion along the axial direction of the winding core, that is, the height dimension of the barrel portion, is limited. On the one hand, the volume of the cooling cavity can be limited according to the need, thereby limiting the amount of phase change material that can be accommodated in the cooling cavity, thereby ensuring the heat absorption capacity of the phase change material in the heat absorption sealing nail. On the other hand, the space and weight occupied by the heat absorption sealing nail as a whole can be limited to avoid excessive impact on the energy density of the cylindrical battery.

[0012] In some embodiments, the heat absorption sealing nail further comprises a sealing block arranged at the open end of the barrel portion to close the barrel portion and form the cooling cavity.

[0013] Based on the above-mentioned embodiments of the present application, by arranging the sealing block, the cylinder part can be closed to form a cooling cavity. At this time, on the one hand, the sealing effect of the heat absorption sealing nail itself can be enhanced to avoid the outflow of the phase change material. On the other hand, the injection of the phase change material can be facilitated. After the phase change material is injected into the cooling cavity, the sealing block is closed, so that the injection process of the phase change material is more simple and convenient.

[0014] In some embodiments, the shell is arranged as a cylindrical structure with two open ends, and the two open ends of the shell are respectively provided with a first cover plate and a second cover plate.

[0015] Based on the above-mentioned embodiments of the present application, by cooperating the shell with the first cover plate and the second cover plate at both ends, a complete battery shell structure is formed for closing the roll core and electrolyte in the containing cavity, while achieving insulation protection and avoiding electrolyte leakage and other problems.

[0016] In some embodiments, the second cover plate is provided with a liquid injection hole, the liquid injection hole is communicated to the containing cavity, and the liquid injection hole is arranged opposite to the roll needle cavity. The sealing part is at least partially overlapped with the second cover plate to close the liquid injection hole.

[0017] Based on the above-mentioned embodiments of the present application, by forming the liquid injection hole, electrolyte injection can be realized through the liquid injection hole during the production and processing of the cylindrical battery. After the injection is completed, the liquid injection hole position is sealed by the overlapping between the sealing part and the second cover plate to avoid electrolyte leakage from the liquid injection hole position during the subsequent use of the cylindrical battery.

[0018] In some embodiments, the diameter of the cylinder part is φ1, the diameter of the liquid injection hole is φ2, and 0.8φ2≤φ1≤0.96φ2.

[0019] Based on the above-mentioned embodiments of the present application, by limiting the diameter of the cylinder part, on the one hand, the volume of the cooling cavity can be limited to ensure the amount of phase change material in the cooling cavity and ensure the heat absorption effect. On the other hand, the heat absorption sealing nail can be matched with the liquid injection hole to ensure good sealing effect of the liquid injection hole.

[0020] In some embodiments, the second cover plate is further provided with a connecting part, the connecting part is arranged as an inwardly recessed structure towards the roll core direction, and the connecting part is indirectly connected to the roll core.

[0021] Based on the above-mentioned embodiments of the present application, by arranging the connecting part, the connection between the roll core and the second cover plate can be conveniently conducted, and the connection between the roll core and the external circuit can be conveniently realized.

[0022] In some embodiments, the second cover plate is further provided with a pressure relief part, and the pressure relief part is arranged opposite to the roll needle cavity.

[0023] Based on the above-mentioned embodiments of the present application, by setting the pressure relief part, it can be directly set as a structure such as an explosion-proof valve, so that the internal pressure of the cylindrical battery can be relieved when the cylindrical battery is in thermal runaway, so as to reduce or even avoid the possibility of fire and explosion of the cylindrical battery, and improve the safety of the battery during use.

[0024] According to a second aspect of the present application, a power-using device is provided, which comprises a device body and the cylindrical battery described above. The device body is provided with a power supply cavity, and the cylindrical battery is arranged in the power supply cavity.

[0025] Based on the above-mentioned embodiments of the present application, the power-using device provided by the present application comprises the cylindrical battery described above, so it also has the beneficial effects described above. To avoid repetition, they will not be described here.

[0026] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the present application, but do not constitute a limitation on the present application. In the drawings:

[0028] Figure 1 is a structural schematic diagram of the cylindrical battery provided by the embodiments of the present application.

[0029] Figure 2 is a sectional view of the cylindrical battery provided by the embodiments of the present application.

[0030] Figure 3 is Figure 2 a structural schematic diagram of the A area in FIG.

[0031] Figure 4 is Figure 2 a structural schematic diagram of the B area in FIG.

[0032] REFERENCE SIGNS

[0033] 1, shell; 11, accommodating cavity; 2, roll core; 21, roll needle cavity; 3, heat absorption sealing nail; 31, cooling cavity; 32, barrel part; 33, sealing part; 34, sealing block; 4, first cover plate; 5, second cover plate; 51, liquid injection hole; 52, connecting part; 6, pole column; 7, current collector disc. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0037] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0038] In the description of the present application, it should be noted that, unless otherwise stated, the orientation or positional relationship indicated by the terms "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] When the power battery is used, heat will be generated inside the battery. At this time, the battery is usually cooled by setting a liquid cooling plate or an air cooling device.

[0041] However, during the aforementioned heat dissipation process, the liquid cooling plate or the airflow acting as the cooling medium can only contact the outer wall of the battery. Heat tends to accumulate more easily in the center of the battery during use. These factors combined result in a significant temperature difference between the battery's center and the outer wall. Especially under abnormal operating conditions, such as high-power output or physical impact, the temperature at the battery's center rises rapidly. At this time, due to limitations in heat conduction rate, the liquid cooling plate and air-cooling devices cannot quickly cool the battery's center, easily causing the center temperature to exceed the safe temperature range. This can lead to thermal runaway or even battery fire and explosion, severely impacting battery lifespan and safety.

[0042] To address the aforementioned problems in the prior art, reference is made to... Figure 1 and Figure 2 As shown, according to a first aspect of this application, an embodiment of this application provides a cylindrical battery, which includes a casing 1, a winding core 2, and a heat-absorbing sealing pin 3. The casing 1 has a receiving cavity 11 inside, the winding core 2 is disposed within the receiving cavity 11, and a winding needle cavity 21 is formed axially in the middle of the winding core 2. The heat-absorbing sealing pin 3 is disposed within the winding needle cavity 21. The heat-absorbing sealing pin 3 is configured as a hollow structure to form a cooling cavity 31 inside, and a phase change material is disposed within the cooling cavity 31.

[0043] Based on the above embodiments of this application, when the cylindrical battery is used, a heat-absorbing sealing nail 3 is provided in the winding needle cavity 21 at the middle position of the winding core 2, and a phase change material is provided in the heat-absorbing sealing nail 3. During the use of the cylindrical battery, when abnormal heat occurs at the center of the cylindrical battery, the temperature at the center of the battery will rise rapidly due to heat accumulation. At this time, the phase change material provided in the heat-absorbing sealing nail 3 can absorb heat through phase change, thereby reducing the temperature at the center of the battery. To a certain extent, this avoids problems such as excessively high temperature at the center of the battery and excessive temperature difference between the center and the outside of the cell, thereby extending the battery's service life and reducing or even avoiding the risk of battery fire or even explosion.

[0044] Meanwhile, the sealing pin, a commonly used structure in cylindrical batteries for sealing the liquid injection opening, is improved by the above-mentioned setting to form the heat-absorbing sealing pin 3 in this application. The heat absorption effect is increased without affecting the original sealing effect of the sealing pin, thereby reducing the problem of excessive space occupation of the cylindrical battery caused by setting other structures. In other words, it can reduce the space occupation of the cylindrical battery and reduce the production and processing cost to a certain extent, thus ensuring the energy density of the cylindrical battery.

[0045] Specifically, in the production process of the cylindrical battery, the battery pole piece needs to be wound on the winding needle, and then the winding needle is extracted to form the winding core 2 structure. The winding core 2 is arranged in the accommodating cavity 11 and forms a cylindrical battery structure after being injected with electrolyte. Therefore, the above structure of the present application is naturally formed during the production process of the winding core 2, and does not need to be separately processed later. Therefore, it can not only simplify the processing procedure and reduce the production cost, but also reduce the influence on the volume and energy density of the winding core 2.

[0046] At the same time, the phase change material as the heat absorption medium in the present application only performs phase change circulation in the cooling liquid cavity during use. Compared with the method of arranging a liquid cooling pipeline at the center position of the battery to cool the center position of the battery, the above arrangement of the present application reduces the arrangement of the liquid cooling circulation pipeline and other structures, thereby not only reducing the occupation of the internal space of the cylindrical battery, but also reducing the influence on the assembly and arrangement of the cylindrical battery.

[0047] Further, in use of the above structure in the present application, the heat absorption sealing nail 3 can absorb heat at the center position of the cylindrical battery, slow down the temperature rise rate at the center position of the cylindrical battery by phase change heat absorption, and avoid the risk of fire or explosion of the battery caused by rapid temperature rise at the center position of the battery. However, at the same time, the above structure plays a heat absorption effect on the center position of the battery, but does not involve how to take the heat away from the battery. Therefore, the cylindrical battery based on the above arrangement should be further arranged with a liquid cooling plate or an air cooling module and other cooling structures when arranged in a battery pack, so as to cool the cylindrical battery under normal working conditions. The heat absorbed in the phase change material is slowly and stably transferred to the outer wall of the battery by heat conduction, and then taken away by the liquid cooling plate or the direct contact of air flow with the outer wall of the cylindrical battery, so as to realize heat control of the cylindrical battery by cooperating with the heat absorption sealing nail 3 and other structures, thereby prolonging the service life of the cylindrical battery and improving the safety of the battery during use.

[0048] In addition, it should be noted that the above heat absorption sealing nail 3 and other structures in the present application are not limited to be applied to the cylindrical battery structure. The heat absorption sealing nail 3 in the present application is arranged to play a heat absorption and cooling effect at the center position of the cylindrical battery. In square batteries and other special-shaped battery structures, the heat absorption sealing nail 3 can also be arranged at the center position of the battery to absorb heat at the center position of the battery by the phase change material in the heat absorption sealing nail 3, so as to achieve the same effect of avoiding overheating at the center position of the battery. At the same time, the specific structure and arrangement position of the heat absorption sealing nail 3 can be adjusted adaptively according to different battery structures to meet the heat absorption requirements of the center position of different shaped batteries.

[0049] Further, in the present application, the phase change material can be selected from any suitable material category. This includes inorganic phase change materials, such as crystalline hydrated salts, molten salts, etc., and organic phase change materials, such as paraffin, acetic acid, and other organic substances, etc. The specific selection can be made according to the specific heat absorption requirements of the phase change material and other factors, which are not specifically limited in the present application.

[0050] Reference Figure 2 As shown in the, in an exemplary embodiment provided by the present application, the shell 1 can be provided as a cylindrical structure with both ends open, and the two open ends of the shell 1 are respectively provided with the first cover plate 4 and the second cover plate 5.

[0051] Based on the above embodiments of the present application, by cooperating the shell 1 with the first cover plate 4 and the second cover plate 5 at both ends, a complete battery shell structure is formed for enclosing the roll core 2 and electrolyte, etc. in the accommodating cavity 11, while achieving insulation protection and avoiding electrolyte leakage, etc.

[0052] Specifically, when the cylindrical battery structure is in use, the cylindrical battery can further include a plurality of structures such as a pole 6 and a current collector 7. The shell 1 is provided with the first cover plate 4 and the second cover plate 5 at both ends to form a battery shell structure, the roll core 2 is arranged in the accommodating cavity 11, and the roll core 2 is provided with the current collector 7 at both ends. The roll core 2 and the current collector 7 are connected and conducted through the structure such as the tab, and one of the first cover plate 4 or the second cover plate 5 is provided with the pole 6, for example, the pole 6 is arranged on the first cover plate 4, and the pole 6 and the first cover plate 4 are insulated and separated. At this time, the roll core 2 is connected and conducted through the two current collectors 7 at both ends and the poles 6 and the second cover plate 5 on both sides, realizing the input and output of the positive and negative electrodes of the cylindrical battery.

[0053] Further, in the present application, the first cover plate 4 and the second cover plate 5 can be integrally provided with the shell 1 and integrally machined and formed by pressure casting, etc., or can be separately machined and then connected by welding, etc. Alternatively, one of the first cover plate 4 and the second cover plate 5 can be integrally machined and formed with the shell 1, and the other can be separately machined and welded to the shell 1, thereby facilitating the placement of the roll core 2 into the accommodating cavity 11. The specific machining and assembly method can be selected according to the strength requirements and sealing requirements of the cylindrical battery, which are not specifically limited in the present application.

[0054] Reference Figure 3 As shown in the, in an exemplary embodiment provided by the present application, the shell 1 can be provided as a cylindrical structure with both ends open, and the two open ends of the shell 1 are respectively provided with the first cover plate 4 and the second cover plate 5.

[0055] Based on the above embodiments of the present application, by forming the liquid injection hole 51, electrolyte injection can be realized through the liquid injection hole 51 during the production and processing of the cylindrical battery. After the injection is completed, the position of the liquid injection hole 51 is sealed by the heat-absorbing sealing nail 3 to avoid electrolyte leakage from the position of the liquid injection hole 51 during the subsequent use of the cylindrical battery.

[0056] Specifically, during the production and assembly of the cylindrical battery, the electrolyte is injected into the containing cavity 11 from the liquid injection hole 51. By arranging the liquid injection hole 51 opposite to the coil needle cavity 21, the injection resistance can be reduced during injection, ensuring smooth injection process and reducing electrolyte splashing. At the same time, after the injection is completed, the position of the liquid injection hole 51 is also easily sealed by the heat-absorbing sealing nail 3 to reduce or even avoid the possibility of electrolyte leakage from the position of the liquid injection hole 51.

[0057] Further, in some embodiments of the present application, when the liquid injection hole 51 is formed on the second cover plate 5, the liquid injection hole 51 can extend partially into the containing cavity 11, i.e., the second cover plate 5 extends partially into the containing cavity 11 at the position of the liquid injection hole 51. Thus, on the one hand, it can play a guiding effect during electrolyte injection, reducing the possibility of electrolyte overflow during injection. On the other hand, it can also expand the contact area between the heat-absorbing sealing nail 3 and the second cover plate 5, thereby improving the sealing connection effect between the heat-absorbing sealing nail 3 and the second cover plate 5.

[0058] In the present application, the heat-absorbing sealing nail 3 can be arranged in any suitable structure.

[0059] Reference Figure 2 and Figure 3 In an exemplary embodiment provided by the present application, the heat-absorbing sealing nail 3 can include a barrel portion 32 and a sealing portion 33. The cooling cavity 31 is formed in the barrel portion 32, and the sealing portion 33 is arranged at one end of the barrel portion 32 close to the liquid injection hole 51. The sealing portion 33 at least partially overlaps the second cover plate 5 to close the liquid injection hole 51.

[0060] Based on the above embodiments of the present application, by arranging the barrel portion 32 to form the cooling cavity 31 to accommodate the phase change material. By arranging the sealing portion 33 and overlapping the sealing portion 33 with the second cover plate 5, the connection strength and sealing effect between the heat-absorbing sealing nail 3 and the second cover plate 5 can be enhanced, i.e., the sealing effect of the heat-absorbing sealing nail 3 on the position of the liquid injection hole 51 is enhanced, avoiding electrolyte leakage at the position of the liquid injection hole 51 and other problems, prolonging the service life of the cylindrical battery, and improving the safety during use.

[0061] Specifically, after the electrolyte injection is completed by the electrolyte injection hole 51 position, the heat absorption sealing nail 3 is inserted into the winding needle cavity 21 from the electrolyte injection hole 51 position, which cools the center of the cylindrical battery on one hand and seals the electrolyte injection hole 51 position on the other hand. In this process, the barrel portion 32 is mainly used to form the cooling cavity 31 to achieve the effect of heat absorption cooling for the center of the cylindrical battery, and the sealing portion 33 is mainly used to connect with the second cover plate 5 to achieve the sealing of the electrolyte injection hole 51.

[0062] Further, in order to improve the sealing effect of the electrolyte injection hole 51, the sealing portion 33 can extend to the side portion when arranged, so as to completely cover the position of the electrolyte injection hole 51. In the specific processing process, the sealing portion 33 and the barrel portion 32 can be combined by separate processing and then connected, or can be integrally processed and formed by stamping or injection molding. By the integrally processing and forming mode, not only the connection strength between the sealing portion 33 and the barrel portion 32 can be improved, but also the sealing effect of the joint position of the two can be improved, avoiding the problem of liquid leakage at the joint position of the two.

[0063] Meanwhile, the sealing portion 33 and the second cover plate 5 can be fixed by welding or gluing, and the specific connection mode between the two can be selected according to the specific material of the sealing portion 33 and other factors. For example, since the second cover plate 5 is usually arranged to be a metal material with good electrical conductivity, when the sealing portion 33 and the heat absorption sealing nail 3 are integrally arranged in a metal material, the connection position of the sealing portion 33 and the second cover plate 5 can be fixed by welding, and at this time the connection strength of the connection position of the two is high and the sealing effect is good. When the sealing portion 33 and the heat absorption sealing nail 3 are integrally arranged in a material such as resin or rubber, the sealing portion 33 and the second cover plate 5 can be connected by gluing, and at this time the connection process is simple and fast and the sealing effect is good.

[0064] Meanwhile, in some embodiments of the present application, the connection position of the sealing portion 33 and the barrel portion 32 can be provided with an arc surface structure transition portion, which can reduce the possibility of stress concentration at the connection position of the sealing portion 33 and the barrel portion 32, thereby prolonging the service life of the heat absorption sealing nail 3 and ensuring the connection strength between the sealing portion 33 and the barrel portion 32. Meanwhile, at the connection position of the sealing portion 33 and the barrel portion 32, the arc surface structure transition portion can form a structure similar to a horn mouth at the opening end of the barrel portion 32, which facilitates the injection of the phase change material into the cooling cavity 31.

[0065] In some embodiments of the present application, the dimension of the barrel portion 32 along the axis of the winding core 2 is H1, the dimension of the shell 1 along the axis of the winding core 2 is H2, and the size relationship between the barrel portion 32 and the shell 1 can be set as 0.4H2≤H1≤0.9H2.

[0066] Based on the above embodiments of the present application, when the cylindrical battery is vertically arranged along the axial direction, the dimension of the barrel portion 32 along the axial direction of the winding core 2, i.e., the height dimension of the barrel portion 32, is limited, which can limit the volume of the cooling cavity 31 and the amount of phase change material contained in the cooling cavity 31, thereby ensuring the heat absorption capacity of the phase change material in the heat absorption sealing nail 3. On the other hand, the space and weight occupied by the heat absorption sealing nail 3 can be limited to reduce the impact on the energy density of the cylindrical battery.

[0067] Further, during the insertion of the heat absorption sealing nail 3 through the liquid injection hole 51, by limiting the dimension of the barrel portion 32 along the axial direction of the winding core 2, the heat absorption sealing nail 3 can be prevented from being too long to damage the first cover plate 4 and other structures at the other end of the cylindrical battery.

[0068] In specific settings, the dimension of the barrel portion 32 along the axial direction of the winding core 2 can be set to 40%, 50%, 60%, 70%, 80%, and 90% of the dimension of the shell 1 along the axial direction of the winding core 2, and the specific dimension of the shell 1 along the axial direction of the winding core 2 can be set according to the capacity requirements and assembly requirements of the cylindrical battery, which is not limited in the present application.

[0069] In some embodiments of the present application, the diameter of the barrel portion 32 is φ1, and the diameter of the liquid injection hole 51 is φ2. The ratio between the diameter of the barrel portion 32 and the diameter of the liquid injection hole 51 can be set to 0.8φ2≤φ1≤0.96φ2.

[0070] Based on the above embodiments of the present application, by limiting the diameter of the barrel portion 32, the volume of the cooling cavity 31 can be limited, thereby ensuring the amount of phase change material in the cooling cavity 31 and the heat absorption effect. On the other hand, the heat absorption sealing nail 3 can be adapted to the liquid injection hole 51 to ensure good sealing effect of the liquid injection hole 51.

[0071] In specific settings, the diameter of the barrel portion 32 can be specifically set to 80%, 85%, 90%, and 96% of the diameter of the liquid injection hole 51, and the diameter of the liquid injection hole 51 can be set according to the specifications and injection efficiency requirements of the liquid injection equipment, which is not limited in the present application.

[0072] Reference Figure 3 As shown in the above embodiments of the present application, the heat absorption sealing nail 3 can further include a sealing block 34 arranged at one end of the barrel portion 32 facing the liquid injection hole 51 to close the barrel portion 32 and form the cooling cavity 31.

[0073] Based on the above-mentioned embodiments of the present application, by setting the sealing block 34, the cylinder part 32 can be closed to form the cooling cavity 31, at this time, on the one hand, the sealing effect of the heat absorption sealing nail 3 itself can be enhanced, and the outflow of the phase change material can be avoided. On the other hand, it is also convenient for the injection of the phase change material. After the phase change material is injected into the cooling cavity 31, the sealing block 34 is closed, so that the injection process of the phase change material is more simple and convenient.

[0074] Specifically, when the cylinder part 32 is set to be metal material, the sealing block 34 can also be set to be metal material and connected and fixed with the cylinder part 32 by welding, and at the same time, the sealing is completed. When the cylinder part 32 is set to be resin or rubber material, the sealing block 34 can also be set to be resin or rubber material, and the connection between the cylinder part 32 and the sealing block 34 can be connected by gluing, and at the same time, the sealing between the two is realized.

[0075] Reference Figure 4 As shown in FIG. 1, in some embodiments of the present application, the second cover plate 5 can also be provided with a connecting part 52, which is set to be an inwardly recessed structure towards the direction of the winding core 2, and the connecting part 52 is indirectly connected to the winding core 2.

[0076] Based on the above-mentioned embodiments of the present application, by setting the connecting part 52, the connection between the winding core 2 and the second cover plate 5 can be conveniently conducted, and the connection between the winding core 2 and the external circuit can be conveniently realized.

[0077] Specifically, when the cylindrical battery is also provided with a current collecting disc 7 and a tab structure, by setting the inwardly recessed connecting part 52, the second cover plate 5 and the corresponding current collecting disc 7 are connected and conducted, and the current collecting disc 7 is connected and conducted with the winding core 2 through the tab. At the same time, the current collecting disc 7 near the first cover plate 4 side is also connected and conducted with the winding core 2 through the tab structure, but different is that the current collecting disc 7 needs to be connected and conducted with the pole 6 at this time. The connection between the current collecting disc 7 and the tab, the connection between the current collecting disc 7 and the pole 6, and the connection between the connecting part 52 and the current collecting disc 7 can be fixed and connected by welding.

[0078] In some embodiments of the present application, the second cover plate 5 can also be provided with a pressure relief part, which is arranged opposite to the winder cavity 21.

[0079] Based on the above-mentioned embodiments of the present application, by setting the pressure relief part, which can be directly set to be a structure such as an explosion-proof valve, the internal pressure of the cylindrical battery can be relieved when the cylindrical battery is in thermal runaway, so as to reduce or even avoid the possibility of fire and explosion of the cylindrical battery, and the safety of the battery during use is improved.

[0080] And by setting the explosion-proof valve opposite the winder cavity 21, the pressure caused by the high-temperature smoke when the battery is out of control can be more easily concentrated to the explosion-proof valve position through the winder cavity 21, thereby improving the sensitivity of the explosion-proof valve and improving the safety of the cylindrical battery during use.

[0081] On the basis of the above technical solutions, according to the second aspect of the present application, a power-using device is provided, which includes a device main body and the cylindrical battery described above. The device main body is provided with a power supply cavity, and the cylindrical battery is arranged in the power supply cavity.

[0082] Specifically, in the present application, the power-using device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0083] Based on the above embodiments of the present application, the power-using device provided by the present application includes the cylindrical battery described above, and therefore also has the beneficial effects described above. In order to avoid repetition, further description is omitted here.

[0084] The preferred embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the specific details in the above embodiments. Within the technical concept range of the present application, various simple modifications can be made to the technical solutions of the present application, and these simple modifications all belong to the protection range of the present application.

[0085] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present application.

[0086] In addition, various different embodiments of the present application can also be combined in any manner, as long as they do not deviate from the idea of the present application, and they should also be considered as disclosed in the present application.

Claims

1. A cylindrical battery, characterized by comprising: The cylindrical battery comprises: a shell, which is internally provided with a containing cavity; a winding core, which is arranged in the containing cavity and has a winding needle cavity formed in the middle part of the winding core in the axial direction; a heat-absorbing sealing nail, which is arranged in the winding needle cavity; wherein the heat-absorbing sealing nail is arranged in a hollow structure to form a cooling cavity inside, and the cooling cavity is provided with a phase change material.

2. The cylindrical battery according to claim 1, characterized by, The heat-absorbing sealing nail comprises a barrel part and a sealing part, the barrel part is open at one end and forms the cooling cavity inside, and the sealing part is arranged at the open end of the barrel part.

3. The cylindrical battery according to claim 2, characterized by The size of the barrel part in the axial direction of the winding core is H1, the size of the shell in the axial direction of the winding core is H2, and 0.4H2≤H1≤0.9H2.

4. The cylindrical battery according to claim 2, characterized by, The heat-absorbing sealing nail further comprises a sealing block, which is arranged at the open end of the barrel part to close the barrel part and form the cooling cavity.

5. The cylindrical battery according to claim 2, wherein The shell is arranged in a cylindrical structure with both ends open, and the shell is respectively provided with a first cover plate and a second cover plate at the two open ends.

6. The cylindrical battery according to claim 5, characterized by The second cover plate is provided with a liquid injection hole, which communicates with the containing cavity, and the liquid injection hole is arranged opposite to the winding needle cavity. The sealing part is at least partially overlapped with the second cover plate to close the liquid injection hole.

7. The cylindrical battery according to claim 6, characterized by The diameter of the barrel part is φ1, and the diameter of the liquid injection hole is φ2, and 0.8φ2≤φ1≤0.96φ2.

8. The cylindrical battery according to claim 5, wherein The second cover plate is further provided with a connecting part, which is arranged in a concave structure towards the winding core, and the connecting part is indirectly connected to the winding core.

9. The cylindrical battery according to claim 5, wherein The second cover plate is further provided with a pressure relief part, which is arranged opposite to the winding needle cavity.

10. An electric device, characterized by The electrical equipment comprises: an equipment main body, which is internally provided with a power supply cavity; and the cylindrical battery according to any one of claims 1-9, which is arranged in the power supply cavity.

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