Cylindrical battery and power-consuming device

Abstract

Cylindrical battery, characterized in that it comprises: a housing, wherein a receiving chamber is provided inside the housing; a winding core arranged in the receiving chamber, wherein a winding needle chamber is formed in the middle of the winding core along the axis; a heat-absorbing sealing pin located in the winding needle chamber; wherein the heat-absorbing sealing pin is designed as a hollow structure to form a cooling chamber inside, in which a phase change material is arranged.

Description

TECHNICAL AREA

[0001] The present application relates to the technical field of batteries, in particular a cylindrical battery and a power-consuming device. STATE OF THE ART

[0002] During operation, heat is generated inside a traction battery due to electrochemical reactions and other factors. To prevent this heat from impairing the battery's function, liquid cooling plates or air cooling are typically used to cool the battery cells in current technology.

[0003] However, when using the aforementioned heat dissipation structures, the cooling medium only comes into contact with the outer wall of the battery cells, both in liquid cooling plate cooling and air cooling, so that the heat tends to accumulate in the middle of the battery cells, especially in cylindrical batteries.

[0004] When the battery cell is operated under conditions such as high power output, the heat generation within the cell increases further, and the heat accumulation in the center of the cell intensifies. This can not only lead to an overreaction of the material in the center of the battery cell, impairing the performance of the battery cell material and shortening its lifespan, but in severe cases, it can also lead to a fire or even an explosion of the battery cell. CONTENT OF THE PRESENT APPLICATION

[0005] The purpose of the present application is to provide a cylindrical battery and a power-consuming device, wherein the cylindrical battery solves the problem of heat accumulation in the middle of the battery, which occurs in the prior art and can impair the battery's lifespan or even lead to a fire or explosion.

[0006] To achieve the aforementioned objectives, the present application provides, in its first aspect, a cylindrical battery comprising a housing, a winding core, and a heat-absorbing sealing pin. Inside the housing is a receiving chamber in which the winding core is arranged, with a winding needle chamber formed along the axis of the winding core. The heat-absorbing sealing pin is arranged within this winding needle chamber. The heat-absorbing sealing pin is designed as a hollow structure to form an internal cooling chamber in which a phase-change material is arranged.

[0007] Based on the aforementioned embodiment of the present application, when using the aforementioned cylindrical battery, the arrangement of the heat-absorbing sealing pin in the winding needle chamber in the center of the winding core and the arrangement of the phase-change material in the heat-absorbing sealing pin ensure that, when the cylindrical battery experiences unusual heating, the temperature in the center of the battery rises rapidly due to heat accumulation. In this case, the phase-change material arranged in the heat-absorbing sealing pin can absorb heat through phase change, thereby lowering the temperature in the center of the battery.This allows problems such as excessively high temperatures in the center of the battery and large temperature differences between the center of the battery cell and the outside to be avoided to a certain extent, thereby extending the battery's lifespan and reducing or even eliminating the risk of fire or even battery explosion. Simultaneously, the sealing pin is used as a structure commonly employed in cylindrical batteries to seal the fluid filling opening. In the above arrangement, the existing sealing pin is improved to form the heat-absorbing sealing pin described in the present application. This does not impair the original sealing effect of the sealing pin but enhances its heat absorption effect. This avoids the problem of additional structures taking up too much space inside the cylindrical battery.The space required inside the cylindrical battery can be reduced to a certain extent, and production and processing costs can be lowered, thereby ensuring the energy density of the cylindrical battery.

[0008] In some embodiments, the heat-absorbing sealing pin can comprise a cylinder part and a sealing part, wherein one end of the cylinder part is open, and wherein the cooling chamber is formed inside the cylinder part, and wherein the sealing part is arranged at the open end of the cylinder part.

[0009] Based on the embodiment described above in the present application, the arrangement of the cylindrical part forms a cooling chamber to accommodate the phase change material. The arrangement of the sealing part and its overlap with the second cover plate improves the connection strength and sealing effect between the heat-absorbing sealing pin and the second cover plate. This improves the sealing effect of the heat-absorbing sealing pin at the location of the fluid filling hole, thus preventing problems such as electrolyte leakage at the filling hole, extending the service life of the cylindrical battery, and improving safety during use.

[0010] In some embodiments, the dimension of the cylinder part is along the axis of the winding core H1 and the dimension of the housing is along the axis of the winding core H2, wherein the dimensional ratio between the cylinder part and the housing can be set to 0.4H2 ≤ H1 ≤ 0.9H2.

[0011] Based on the embodiments described above in the present application, when the cylindrical battery is arranged vertically along its axis, the dimension of the cylindrical portion along the axis of the winding core is, namely, the height of the cylindrical portion. By limiting this dimension, the volume of the cooling chamber, and thus the amount of phase-change material housed in the cooling chamber, can be limited to ensure the heat absorption capacity of the phase-change material in the heat-absorbing sealing pin. Furthermore, the overall space requirement and weight of the heat-absorbing sealing pin can also be limited to reduce the impact on the energy density of the cylindrical battery.

[0012] In some embodiments, the heat-absorbing sealing pin further comprises a sealing block arranged at the open end of the cylinder part to close the cylinder part and form the cooling chamber.

[0013] Based on the embodiments described above in the present application, the cylinder section can be closed by arranging the sealing block to form the cooling chamber. This enhances the sealing effect of the heat-absorbing sealing pin itself and prevents leakage of the phase change material. Furthermore, it facilitates the filling of the phase change material, as the sealing block can be closed only after the phase change material has been filled into the cooling chamber, thus making the filling process simpler and more convenient.

[0014] In some embodiments, the housing can be designed as a cylindrical structure open at both ends, with each of the two open ends of the housing being provided with a first cover plate and a second cover plate.

[0015] Based on the above-mentioned embodiment of the present application, the combination of the housing with the first cover plate and the second cover plate at both ends forms a complete battery shell structure, which serves to enclose the winding core and the electrolyte solution, etc., in the receiving chamber, in order to simultaneously provide an insulation protection function and avoid problems such as leakage of electrolyte solution.

[0016] In some embodiments, the second cover plate may be provided with a liquid filling hole that is connected to the interior of the receiving chamber and is located directly opposite the winding needle chamber, with the sealing part overlapping at least partially with the second cover plate to close the liquid filling hole.

[0017] Based on the aforementioned embodiment of the present application, the electrolyte solution can be filled through the liquid filling hole during the manufacturing process of the cylindrical battery by forming the liquid filling hole. After filling, the liquid filling hole is closed and sealed by the heat-absorbing sealing pin to prevent the electrolyte solution from escaping from the liquid filling hole during subsequent use of the cylindrical battery.

[0018] In some embodiments, the diameter of the cylinder part is φ1 and the diameter of the liquid filling hole is φ2, whereby the ratio between the diameter of the cylinder part and the diameter of the liquid filling hole can be set to 0.8φ2 ≤ Φ1 ≤ 0.96 Φ2.

[0019] Based on the embodiments described above in the present application, limiting the diameter of the cylinder section can, on the one hand, limit the volume of the cooling chamber, thereby ensuring the quantity of phase change material in the cooling chamber and guaranteeing the heat absorption effect. On the other hand, the heat-absorbing sealing pin can be adapted to the liquid filling hole, thereby ensuring a good sealing effect for the liquid filling hole.

[0020] In some embodiments, the second cover plate can further be provided with a connecting part, wherein the connecting part is designed as a concave structure directed towards the winding core and the connecting part is indirectly connected to the winding core.

[0021] Based on the above-mentioned embodiments of the present application, the conductive connection between the winding core and the second cover plate can be easily established by the arrangement of the connecting part, thereby easily establishing the conductive connection between the winding core and the external circuit.

[0022] In some embodiments, a pressure relief element may also be provided on the second cover plate, which is located directly opposite the winding needle chamber.

[0023] Based on the above-mentioned embodiments of the present application, the arrangement of the pressure relief part can generally directly provide a structure such as an explosion protection valve, whereby in the event of thermal runaway of the cylindrical battery the pressure inside the cylindrical battery can be relieved in order to reduce or even avoid the possibility of a fire or explosion of the cylindrical battery and to improve safety in the use of the battery.

[0024] In the second aspect, the present application provides a power-consuming device comprising a main body and the aforementioned cylindrical battery. A power supply chamber, in which the cylindrical battery is located, is arranged within the main body.

[0025] Based on the embodiments described above in this application, the power-consuming device described in this application comprises the cylindrical batteries mentioned above and therefore also has the advantageous effects mentioned above, which are not explained again here to avoid repetition.

[0026] Further features and advantages of this registration are explained in detail in the following section “Detailed Description”. BRIEF DESCRIPTION OF THE DRAWING

[0027] The accompanying drawings provide a further understanding of the present invention, form part of the description and, together with the following detailed embodiments, serve to explain the present application, rather than to limit it. Fig. Figure 1 shows a schematic diagram of the structure of a cylindrical battery provided by the embodiments of the present application; Fig. Figure 2 shows a schematic diagram of the cross-section of a cylindrical battery provided by the embodiments of the present application; Fig. Figure 3 shows a schematic diagram of the structure of area A according to Fig. 2; Fig. Figure 4 shows a schematic diagram of the structure of area B according to Fig. 2. Reference symbol list 1 case 11 Admissions Chamber 2 winding core 21 winding needle chamber 3 Heat-absorbing sealing pin 31 Cold storage room 32 Cylinder part 33 Sealing part 34 Sealing block 4 First cover plate 5 Second cover plate 51 Liquid filling hole 52 Connecting part 6-pin 7 Power collector plate DETAILED DESCRIPTION

[0028] To better illustrate the purpose, technical solution, and advantages of this application, it will be explained in more detail below with reference to the attached drawings and embodiments. It is understood that the specific embodiments described here serve only to illustrate this application and not to limit its scope.

[0029] To clarify the purpose, technical solution, and advantages of the embodiments of this application, a clear and complete description of the technical solution in these embodiments is given below with reference to the accompanying drawings. It is understood that the described embodiments represent only a portion of the embodiments of this application and do not encompass all embodiments. The components of the embodiments of this application described and illustrated in the accompanying drawings can be arranged and designed in various configurations.

[0030] Therefore, the following detailed description of the embodiments of this application shown in the accompanying drawings is not intended to limit the scope of this application, but merely to represent selected embodiments. All other embodiments that a person skilled in the art in this field can achieve based on the embodiments of this application without creative work fall within the scope of protection of this application.

[0031] It should be noted that similar symbols and letters in the following drawings denote similar elements, so that an element defined in one drawing does not need to be further defined and explained in subsequent drawings.

[0032] In the description of this application, it should be noted that, unless otherwise stated, directions or positions indicated by terms such as "inside" and "outside" are based on the directions or positions shown in the drawings or correspond to the usual directions or positions when using the product of this application. These terms serve only to simplify the description of this application and do not indicate or suggest that the designated devices or elements must have a specific orientation, be designed, or be operated in a specific orientation. Therefore, this should not be understood as a limitation of this application. Furthermore, terms such as "first," "second," etc., are used only for differentiation in the description and should not be understood as indicating or suggesting a relative meaning.

[0033] It should further be noted that, in the description of the present application, the terms "arranged" and "connected" should be understood in a broad sense without any express provisions or limitations to the contrary. For example, it can be a fixed connection as well as a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection via a medium, or it can be a connection between the interiors of two elements. The person skilled in the art in this field can understand the specific meanings of the aforementioned terms in the present application based on the specific situations.

[0034] When using traction batteries, heat is generated inside the battery. In this case, heat dissipation from the battery is usually achieved through a liquid cooling plate or an air cooling device.

[0035] In the cooling process described above, however, both the liquid cooling plate and the airflow serving as the cooling medium only come into contact with the outer wall of the battery, while heat tends to accumulate in the center during battery operation. These factors result in a significant temperature difference between the center and the outer wall of the battery. Particularly under abnormal operating conditions, such as high power output or physical impacts on the battery, the temperature in the center of the battery cell rises rapidly.Due to factors such as the rate of heat conduction, the liquid cooling plate and the air cooling device cannot quickly lower the temperature in the center of the battery, which can easily cause the temperature in the center of the battery to exceed the safe temperature range, thus creating a risk of thermal runaway or even a fire or explosion of the battery, which significantly affects the battery's lifespan and safety.

[0036] To solve the aforementioned problems of the existing technology, the first aspect of the present application, as described in Fig. 1 and Fig. Figure 2 shows a cylindrical battery comprising a housing 1, a winding core 2, and a heat-absorbing sealing pin 3. Inside the housing 1 is a receiving chamber 11 in which the winding core 2 is arranged, with a winding needle chamber 21 formed in the center of the winding core 2 along its axis. The heat-absorbing sealing pin 3 is arranged in the winding needle chamber 21. The heat-absorbing sealing pin 3 is designed as a hollow structure to form an internal cooling chamber 31 in which a phase-change material is arranged.

[0037] Based on the aforementioned embodiment of the present application, when using the aforementioned cylindrical battery, the arrangement of the heat-absorbing sealing pin 3 in the winding needle chamber 21 in the center of the winding core 2 and the arrangement of the phase-change material in the heat-absorbing sealing pin 3 ensure that, when the cylindrical battery is used, if unusual heating occurs in the center of the cylindrical battery, the temperature in the center of the battery rises rapidly due to heat accumulation. In this case, the phase-change material arranged in the heat-absorbing sealing pin 3 can absorb heat through phase change, thereby lowering the temperature in the center of the battery.This can help to avoid problems such as excessively high temperatures in the center of the battery and excessive temperature differences between the center of the battery cell and the outside, thus extending the battery's lifespan and reducing or even eliminating the risk of fire or even battery explosion.

[0038] Simultaneously, the sealing pin is used as a structure commonly employed in cylindrical batteries for sealing the liquid filling opening. In the above arrangement, the existing sealing pin is improved to form the heat-absorbing sealing pin 3 of the present application, which does not impair the original sealing effect of the sealing pin but increases its heat absorption effect. This avoids the problem of the additional structures taking up too much space inside the cylindrical battery, i.e., the space requirement inside the cylindrical battery can be reduced to a certain extent, and production and processing costs can be lowered, thereby ensuring the energy density of the cylindrical battery.

[0039] In particular, during the manufacture and processing of a cylindrical battery, the battery's electrode foil must be wound onto a winding needle, which is then withdrawn to form the winding core structure 2. The winding core 2 is placed in the receiving chamber 11, and after the electrolyte is added, the structure of the cylindrical battery is formed. Therefore, in the aforementioned structure of the present application, the winding needle chamber 21 is formed naturally during the manufacturing process of the winding core 2, without requiring any separate post-processing. This not only simplifies the processing and reduces production costs but also minimizes the impact on the volume and energy density of the winding core 2.

[0040] Simultaneously, when using the phase-change material employed as a heat-absorbing medium in the present application, the phase-change cycle takes place only within the cooling liquid chamber. Compared to methods where a liquid cooling line is arranged in the center of the battery to cool the center, the arrangement described above in the present application reduces the number of structures such as liquid cooling circuit lines, thereby reducing both the space required inside the cylindrical battery and the impact on the assembly and layout of the cylindrical battery.

[0041] Furthermore, when using the aforementioned structure of the present application, the heat-absorbing sealing pin 3 can be arranged to absorb heat in the center of the cylindrical battery cell. This slows the temperature rise rate in the center of the cylindrical battery through phase-change heat absorption and avoids the risk of fire or even battery explosion due to a rapid temperature increase in the center. However, while the aforementioned structure absorbs heat in the center of the battery, it does not address how the heat can be dissipated from the battery. Therefore, cylindrical batteries arranged in a battery pack based on the aforementioned design should be equipped with cooling structures such as liquid cooling plates or air cooling modules to cool the cylindrical batteries under normal operating conditions.The heat absorbed in the phase change material is transferred slowly and stably to the outer wall of the battery by thermal conduction and subsequently dissipated by direct contact of the liquid cooling plate or the airflow with the outer wall of the cylindrical battery, thereby achieving thermal control of the cylindrical battery in conjunction with the aforementioned structures such as the heat-absorbing sealing pin 3, which in turn extends the service life of the cylindrical battery and increases safety during battery use.

[0042] Furthermore, it should be noted that the aforementioned structures, such as the heat-absorbing sealing pin 3 in the present application, are not limited to cylindrical battery structures. The heat-absorbing sealing pin 3 in the present application is arranged to achieve a heat absorption and cooling effect in the center of the cylindrical battery. In square batteries and other batteries with irregular shapes, a heat-absorbing sealing pin 3 can also be arranged in the center of the battery to achieve heat absorption cooling in the center of the battery by means of the phase-change material in the heat-absorbing sealing pin 3, thus also preventing overheating in the center of the battery.At the same time, with the specific arrangement, the specific structural shape and the arrangement position of the heat-absorbing sealing pin 3 can be adapted to different battery structures in order to meet the requirements for heat absorption in the middle of batteries of different shapes.

[0043] Furthermore, any suitable materials can be selected as phase-change materials in the present application. These include inorganic phase-change materials such as crystalline hydrated salts, molten salts, etc., as well as organic phase-change materials such as paraffin, acetic acid, and other organic substances. The selection can be made based on the specific requirements for the heat absorption of the phase-change material, and the present application does not impose any particular restrictions.

[0044] As in Fig. As shown in Figure 2, in an exemplary embodiment of the present application the housing 1 can be designed as a cylindrical structure open at both ends, wherein the two open ends of the housing 1 are each provided with a first cover plate 4 and a second cover plate 5.

[0045] Based on the above-mentioned embodiment of the present application, the combination of the housing 1 with the first cover plate 4 and the second cover plate 5 at both ends forms a complete battery shell structure, which serves to enclose the winding core 2 and the electrolyte solution etc. in the receiving chamber 11 in order to simultaneously realize an insulation protection function and avoid problems such as leakage of electrolyte solution.

[0046] In particular, the aforementioned cylindrical battery structure can further incorporate several structures, such as a terminal 6 and a current collector plate 7, within the cylindrical battery. At both ends of the casing 1, the first cover plate 4 and the second cover plate 5 are arranged to form the battery shell structure when closed. The winding core 2 is arranged in the receiving chamber 11, and current collector plates 7 are arranged at both ends of the winding core 2. The winding core 2 and the current collector plates 7 are conductively connected by structures such as pole eyes. Simultaneously, a terminal 6 is arranged on one of the first cover plate 4 and the other on the second cover plate 5; for example, the terminal 6 is arranged on the first cover plate 4, and the terminal 6 and the first cover plate 4 are separated from each other by insulation.At this point, the two ends of the winding core 2 are conductively connected via the two current collector plates 7 to the poles 6 and the second cover plate 5 on both sides, thereby realizing the input and output of the positive and negative electrodes of the cylindrical battery.

[0047] Furthermore, in the present application, the first cover plate 4 and the second cover plate 5 can either be arranged in one piece with the housing 1 and formed in one piece by die casting or otherwise, or they can be manufactured separately and then joined by welding or otherwise. Alternatively, one of the first cover plate 4 and the second cover plate 5 can be formed in one piece with the housing 1, while the other is manufactured separately and welded to the housing 1 to facilitate the insertion of the winding core 2 into the receiving chamber 11. The specific machining and assembly method can be selected according to the requirements for the strength and tightness of the cylindrical battery, and the present application does not impose any particular restrictions.

[0048] As in Fig. As shown in Figure 3, in an embodiment of the present application the second cover plate 5 can be provided with a liquid filling hole 51 which is connected to the interior of the receiving chamber 11 and is arranged directly opposite the winding needle chamber 21.

[0049] Based on the aforementioned embodiment of the present application, the electrolyte solution can be filled through the liquid filling hole 51 during the manufacturing process of the cylindrical battery by forming the liquid filling hole 51. After filling, the liquid filling hole 51 is closed and sealed by the heat-absorbing sealing pin 3 to prevent the electrolyte solution from escaping from the liquid filling hole 51 during subsequent use of the cylindrical battery.

[0050] In particular, during the manufacturing and assembly process of the cylindrical battery, the electrolyte solution is filled into the receiving chamber 11 through the liquid filling hole 51. By positioning the liquid filling hole 51 directly opposite the winding needle chamber 21, the filling resistance can be reduced, ensuring a smooth filling process and minimizing electrolyte splashing. Simultaneously, after the filling process is complete, the liquid filling hole 51 can be easily sealed by the heat-absorbing sealing pin 3 to reduce or even prevent the possibility of electrolyte solution leaking from the liquid filling hole 51.

[0051] Furthermore, in some embodiments of the present application, the liquid filling hole 51, when provided in the second cover plate 5, can extend into the interior of the receiving chamber 11, i.e., the second cover plate 5 extends into the interior of the receiving chamber 11 at the location of the liquid filling hole 51. This allows, on the one hand, a conductivity effect to be achieved during the filling of the electrolyte solution and reduces the possibility of the electrolyte solution overflowing during the filling process. On the other hand, the contact area between the heat-absorbing sealing pin 3 and the second cover plate 5 can also be increased, thereby improving the sealed connection between the heat-absorbing sealing pin 3 and the second cover plate 5.

[0052] In the present application, the heat-absorbing sealing pin 3 can be configured as any suitable structure.

[0053] As in Fig. 2 and Fig. As shown in Figure 3, in an exemplary embodiment of the present application, the heat-absorbing sealing pin 3 can comprise a cylinder part 32 and a sealing part 33, wherein the cooling chamber 31 is formed in the cylinder part 32, the sealing part 33 is arranged at an end of the cylinder part 32 facing the liquid filling hole 51, and the sealing part 33 overlaps at least partially with the second cover plate 5 in order to close the liquid filling hole 51.

[0054] Based on the embodiment of the present application described above, the arrangement of the cylindrical part 32 forms a cooling chamber 31 to accommodate the phase change material. The arrangement of the sealing part 33 and its overlap with the second cover plate 5 improves the connection strength and sealing effect between the heat-absorbing sealing pin 3 and the second cover plate 5. This improves the sealing effect of the heat-absorbing sealing pin 3 at the location of the liquid filling hole 51, thus preventing problems such as leakage of electrolyte solution at the location of the liquid filling hole 51. This extends the service life of the cylindrical battery and improves safety during use.

[0055] In particular, after the electrolyte solution has been poured in through the liquid filling hole 51, the heat-absorbing sealing pin 3 is inserted through the liquid filling hole 51 into the winding needle chamber 21 to cool the center of the cylindrical battery and to close the liquid filling hole 51. In this process, the cylindrical part 32 primarily serves to form the cooling chamber 31 to dissipate and cool the heat in the center of the cylindrical battery, while the sealing part 33 primarily serves to connect with the second cover plate 5 to close and seal the liquid filling hole 51.

[0056] To further improve the sealing effect for the liquid filling hole 51, the sealing element 33 can be positioned to extend laterally and completely cover the liquid filling hole 51. In the specific machining process, the sealing element 33 and the cylinder part 32 can either be machined separately and then joined together, or formed directly as a single piece by stamping or injection molding. This one-piece forming process not only improves the bond strength between the sealing element 33 and the cylinder part 32, but also the sealing effect at the joint between the two, thus preventing problems such as liquid leakage at the joint.

[0057] Simultaneously, the sealing element 33 can be attached to the second cover plate 5 by welding or gluing, with the specific joining method between the two being selectable depending on the material of the sealing element 33 and other factors. Since the second cover plate 5 is typically made of a highly conductive metal, the connection between the sealing element 33 and the second cover plate 5 can be fixed by welding if the sealing element 33 and the heat-absorbing sealing pin 3 are both made of metal. In this case, the bond strength at the connection point between the two is high, and the sealing effect is good. However, if the sealing element 33 and the heat-absorbing sealing pin 3 are both made of a material such as resin or rubber, the connection between the sealing element 33 and the second cover plate 5 can be made by gluing.In this case, the connection process is simple and quick, and the sealing effect is good.

[0058] Simultaneously, in some embodiments of the present application, the connection point between the sealing part 33 and the cylinder part 32 can be provided with a transition part having a curved structure. This transition part with a curved structure can reduce the possibility of stress concentration at the connection point between the sealing part 33 and the cylinder part 32, thereby extending the service life of the heat-absorbing sealing pin 3 and ensuring the connection strength between the sealing part 33 and the cylinder part 32. At the same time, the arrangement of the transition part with a curved structure at the connection point between the sealing part 33 and the cylinder part can form a trumpet-like structure at the open end of the cylinder part 32, which facilitates the filling of the phase-change material into the cooling chamber 31.

[0059] In some embodiments of the present application, the dimension of the cylinder part 32 is along the axis of the winding core 2 H1 and the dimension of the housing 1 is along the axis of the winding core 2 H2, wherein the dimensional ratio between the cylinder part 32 and the housing 1 can be set to 0.4H2≤H1≤0.9H2.

[0060] Based on the embodiments described above in the present application, when the cylindrical battery is arranged vertically along its axis, the dimension of the cylinder part 32 along the axis of the winding core 2 is, namely, the height of the cylinder part 32. By limiting this dimension, the volume of the cooling chamber 31, and thus the amount of phase-change material housed in the cooling chamber 31, can be limited to ensure the heat absorption capacity of the phase-change material in the heat-absorbing sealing pin 3. Furthermore, the overall space requirement and weight of the heat-absorbing sealing pin 3 can also be limited to reduce the impact on the energy density of the cylindrical battery.

[0061] Furthermore, by limiting the dimension of the cylinder part 32 along the axis of the winding core 2 when inserting the heat-absorbing sealing pin 3 through the liquid filling hole 51, it can be avoided that the heat-absorbing sealing pin 3, due to its excessive length, damages structures such as the first cover plate 4 at the other end of the cylindrical battery.

[0062] In the specific setting, the dimension of the cylinder part 32 along the axis of the winding core 2 can be set to several specific ratios, for example 40%, 50%, 60%, 70%, 80% and 90% of the dimension of the housing 1 along the axis of the winding core 2, while the specific dimension of the housing 1 along the axis of the winding core 2 can be set according to the capacity requirements of the cylindrical battery and the assembly requirements, with the present application imposing no specific restrictions.

[0063] In some embodiments of the present application, the diameter of the cylinder part 32 is φ1 and the diameter of the liquid filling hole 51 is φ2, wherein the ratio between the diameter of the cylinder part 32 and the diameter of the liquid filling hole 51 can be set to 0.8φ2≤φ1≤0.96φ2.

[0064] Based on the embodiments described above in the present application, limiting the diameter of the cylinder part 32 can, on the one hand, limit the volume of the cooling chamber 31, thereby ensuring the quantity of phase change material in the cooling chamber 31 and guaranteeing the heat absorption effect. On the other hand, the heat-absorbing sealing pin 3 can be adapted to the liquid filling hole 51, thereby ensuring a good sealing effect for the liquid filling hole 51.

[0065] In the specific setting, the diameter of the cylinder part 32 can in particular be set to several specific ratios such as 80%, 85%, 90% and 96% of the diameter of the liquid filling hole 51, while the diameter of the liquid filling hole 51 can be set according to the specifications of the liquid filling device, the requirements for liquid filling efficiency and other factors, the present application not imposing any special restrictions.

[0066] With reference to Fig. 3 In some embodiments of the present application, the heat-absorbing sealing pin 3 may further comprise a sealing block 34 which is arranged at an end of the cylinder part 32 facing the liquid filling hole 51 in order to close the cylinder part 32 and to form a cooling chamber 31.

[0067] Based on the embodiments described above in the present application, the cylinder part 32 can be closed by arranging the sealing block 34 to form the cooling chamber 31. This enhances the sealing effect of the heat-absorbing sealing pin 3 itself and prevents leakage of the phase change material. Furthermore, it facilitates the filling of the phase change material, since the sealing block 34 can be closed only after the phase change material has been filled into the cooling chamber 31, thus making the filling process simpler and more convenient.

[0068] If the cylinder part 32 is made of metal, the sealing block 34 can also be made of metal and joined and fastened to the cylinder part 32 by welding, thereby completing the seal. If the cylinder part 32 is made of plastic or rubber, the sealing block 34 can also be made of plastic or rubber and joined to the cylinder part 32 by gluing or other means, thereby simultaneously creating a seal between the two.

[0069] As in Fig. As shown in Figure 4, in some embodiments of the present application the second cover plate 5 may further be provided with a connecting part 52, wherein the connecting part 52 is designed as a concave structure directed towards the winding core 2 and the connecting part 52 is indirectly connected to the winding core 2.

[0070] Based on the above-mentioned embodiments of the present application, the conductive connection between the winding core 2 and the second cover plate 5 can be easily established by the arrangement of the connecting part 52, thereby easily establishing the conductive connection between the winding core 2 and the external circuit.

[0071] If, in particular, a current collector plate 7 and a pole eye or a similar structure are provided in the cylindrical battery, the arrangement of the concave connecting part 52 facilitates the conductive connection between the second cover plate 5 and the corresponding current collector plate 7, while the current collector plate 7 is conductively connected to the winding core 2 via the pole eye. Simultaneously, the current collector plate 7 is also connected to the winding core 2 on one side facing the first cover plate 4 via structures such as pole eyes; the difference being that in this case, the current collector plate 7 must be conductively connected to the pole 6. The current collector plate 7 and the pole eye, the current collector plate 7 and the pole 6, as well as the connecting part 52 and the current collector plate 7, can be fastened and conductively connected by welding or other means.

[0072] In some embodiments of the present application, a pressure relief element may also be provided on the second cover plate 5, which is arranged directly opposite the winding needle chamber 21.

[0073] Based on the above-mentioned embodiments of the present application, the arrangement of the pressure relief part can generally directly provide a structure such as an explosion protection valve, whereby in the event of thermal runaway of the cylindrical battery the pressure inside the cylindrical battery can be relieved in order to reduce or even avoid the possibility of a fire or explosion of the cylindrical battery and to improve safety in the use of the battery.

[0074] By arranging the explosion protection valve directly opposite the winding needle chamber 21, the pressure generated by the high-temperature flue gas during a thermal runaway of the battery can be concentrated on the explosion protection valve via the winding needle chamber 21, thereby increasing the sensitivity of the explosion protection valve and improving safety when using the cylindrical battery.

[0075] Based on the aforementioned technical solution, a power-consuming device is provided in accordance with the second aspect of the present application, comprising a main body and the aforementioned cylindrical battery. A power supply chamber is arranged within the main body, in which the cylindrical battery is located.

[0076] In particular, the power-consuming device in the present application can be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, a power tool, an electric bicycle, an electric vehicle, a ship, a spacecraft, etc. The electric toy can include stationary or mobile electric toys, e.g., game consoles, toys for electric vehicles, toys for electric steamships, and toys for electric aircraft, etc., and the spacecraft can include an aircraft, a rocket, a space transporter, and a spaceship, etc.

[0077] Based on the above-mentioned embodiments of the present application, the power-consuming device provided by the present application comprises the above-mentioned cylindrical battery and therefore also has the above-mentioned advantageous effects, which are not described again here to avoid repetition.

[0078] The foregoing description, in conjunction with the accompanying drawings, describes in detail the preferred embodiment of the present application; however, the present application is not limited to the specific details of the embodiment mentioned above. Within the scope of the technical design of the present application, various simple variants of the technical solution of the present application are possible, all of which fall within the scope of protection of the present application.

[0079] Furthermore, it should be noted that the individual technical features described in the aforementioned specific embodiments can be combined in any suitable way, provided they do not contradict each other. To avoid unnecessary repetition, the various possible combinations are not explained separately in this application.

[0080] Furthermore, the various embodiments of this application may be combined in any way, provided they do not contradict the idea of ​​this application. They are also to be regarded as part of the content of this application.

Claims

[1] Cylindrical battery, characterized by that it includes: a housing, wherein a receiving chamber is provided inside the housing; a winding core arranged in the receiving chamber, wherein a winding needle chamber is formed in the middle of the winding core along the axis; a heat-absorbing sealing pin located in the winding needle chamber; wherein the heat-absorbing sealing pin is designed as a hollow structure to form a cooling chamber inside, in which a phase change material is arranged. [2] Cylindrical battery according to claim 1, characterized by , that the heat-absorbing sealing pin comprises a cylinder part and a sealing part, wherein one end of the cylinder part is open, and wherein the cooling chamber is formed inside the cylinder part, and wherein the sealing part is arranged at the open end of the cylinder part. [3] Cylindrical battery according to claim 2, characterized by , that the dimension of the cylinder part along the axis of the winding core is H1 and the dimension of the housing along the axis of the winding core is H2, where 0.4H2≤H≤0.9H2. [4] Cylindrical battery according to claim 2, characterized by , that the heat-absorbing sealing pin further comprises a sealing block which is arranged at the open end of the cylinder part to close the cylinder part and form the cooling chamber. [5] Cylindrical battery according to claim 2, characterized by , that the housing is designed as a cylindrical structure open at both ends, with each of the two open ends of the housing being provided with a first cover plate and a second cover plate. [6] Cylindrical battery according to claim 5, characterized bythat the second cover plate shall be provided with a liquid filling hole which is connected to the interior of the receiving chamber and is located directly opposite the winding needle chamber; wherein the sealing part overlaps at least partially with the second cover plate in order to close the liquid filling hole. [7] Cylindrical battery according to claim 6, characterized by , that the diameter of the cylinder part is φ1 and the diameter of the liquid filling hole is φ3, where 0.8φ2≤φ10.96φ2. [8] Cylindrical battery according to claim 5, characterized by , that the second cover plate is further provided with a connecting part, wherein the connecting part is designed as a concave structure directed towards the winding core and the connecting part is indirectly connected to the winding core. [9] Cylindrical battery according to claim 5, characterized bythat a pressure relief element is still provided on the second cover plate, which is located directly opposite the winding needle chamber. [10] Power-consuming device, characterized by , that it includes: a main body of the device in which a power supply chamber is arranged; and a cylindrical battery according to one of claims 1 to 9, which is arranged in the power supply chamber.

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