Cylindrical battery monomer, battery device and power utilization device

Abstract

The embodiment of the utility model provides a cylindrical battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The cylindrical battery cell includes: a housing; the roll core is arranged in the shell; and the heat conduction piece comprises a uniform temperature section and a heat transfer section which are connected, the uniform temperature section is installed in the center hole of the roll core, the heat transfer section is attached to the shell and is attached to a part of the area of the bottom wall of the roll core, and the area, where the heat transfer section is not attached, in the bottom wall of the roll core is used for leading out a first tab of the roll core. Through the design of the heat conduction piece, efficient heat exchange between the interior of the roll core and the external heat exchange plate is achieved, the overall heat exchange efficiency is improved, the temperature difference between the middle position of the roll core and the position close to the external heat exchange plate is reduced, and the overall temperature uniformity of the single cylindrical battery is improved; the performance of the cylindrical battery monomer is improved, the service life of the cylindrical battery monomer is prolonged, the first tab at the bottom of the roll core is smoothly led out, and the high efficiency of heat transfer and the reliability of electrical connection are both considered.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a cylindrical battery cell, a battery device, and an electric device. Background Art

[0002] In the prior art, cylindrical battery cells generate a large amount of heat during the fast charging process, which causes the internal temperature of the cylindrical battery cells to rise sharply. The internal heat is difficult to dissipate in a short period of time, resulting in too low heat exchange efficiency inside the cylindrical battery cells. In addition, since the temperature is higher near the heat exchange plate and lower away from the heat exchange plate, the internal temperature of the cylindrical battery cells is extremely uneven, which seriously affects the performance and service life of the cylindrical battery cells. Utility Model Content

[0003] The present application provides a cylindrical battery cell, a battery device and an electrical device to improve the overall heat exchange efficiency and enhance the uniformity of the overall temperature of the cylindrical battery cell.

[0004] In a first aspect, an embodiment of the present application provides a cylindrical battery cell, comprising:

[0005] shell;

[0006] A winding core, the winding core being arranged in the outer shell;

[0007] A heat conductive part, the heat conductive part comprises a connected uniform temperature section and a heat transfer section, the uniform temperature section is installed in the central hole of the winding core, the heat transfer section is fitted with the outer shell and is fitted with a partial area of ​​the bottom wall of the winding core, and the bottom wall of the winding core is not fitted with the heat transfer section area for leading out the first pole ear of the winding core.

[0008] In the above technical solution, the structural design of the heat conductive part consisting of a temperature-averaging section and a heat transfer section allows the heat inside the core to be quickly transferred to the outer shell. The outer shell and the external heat exchange plate are used for contact heat exchange, thereby achieving efficient heat exchange between the inside of the core and the external heat exchange plate, thereby reducing the thermal resistance between the inside of the core and the external heat exchange plate, improving the overall heat exchange efficiency, and effectively reducing the temperature difference between the middle of the core and the position close to the external heat exchange plate, thereby improving the uniformity of the overall temperature of the cylindrical battery cell, helping to improve the performance and service life of the cylindrical battery cell, and further improving the overall energy efficiency of the electrical device. In addition, the first pole ear at the bottom of the core is smoothly led out, taking into account both the high efficiency of heat transfer and the reliability of electrical connection, thereby improving the overall performance of the cylindrical battery cell.

[0009] In some embodiments, at least a portion of the heat transfer section is clamped between the bottom wall of the winding core and the outer shell.

[0010] In some embodiments, the heat transfer section includes a plurality of heat transfer plates that are separated from each other, the plurality of heat transfer plates are connected to the outer wall of the temperature-averaging section, and the first electrode tab of the winding core is electrically connected to the outer shell through a gap between two adjacent heat transfer plates.

[0011] In some embodiments, the heat transfer section includes a first section and a second section connected to each other, the first section is clamped between the bottom wall of the winding core and the outer shell, and the second section is clamped between the outer side wall of the winding core and the outer shell.

[0012] In some embodiments, the temperature-averaging section is a cylindrical solid body.

[0013] In some embodiments, thermal conductive glue is provided between the thermal conductive element and the housing.

[0014] In some embodiments, the housing includes a shell and a shell cover connected to each other, the shell cover is electrically connected to the first tab of the winding core, and the cylindrical battery cell further includes:

[0015] A pole, the pole is arranged on the end surface of the shell and is electrically connected to the second pole lug of the winding core, and the polarities of the first pole lug and the second pole lug are opposite;

[0016] A sealing member, wherein the end surface of the shell has a liquid injection hole, and the sealing member is arranged at the liquid injection hole and is separated from the heat conducting member.

[0017] In a second aspect, an embodiment of the present application provides a battery device, including:

[0018] A plurality of cylindrical battery cells according to any of the above schemes;

[0019] A heat exchange plate, wherein the heat exchange plate is used to exchange heat with the cylindrical battery cell.

[0020] In a third aspect, an embodiment of the present application provides an electrical device, including:

[0021] As the battery device mentioned above, the battery device is used to store or provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0024] Figure 2 A schematic diagram of the structure of a cylindrical battery cell provided in some embodiments of the present application;

[0025] Figure 3 An exploded view of the structure of a cylindrical battery cell provided in some embodiments of the present application;

[0026] Figure 4 A cross-sectional view of a cylindrical battery cell provided in some embodiments of the present application;

[0027] Figure 5 for Figure 4 A magnified view of the structure at center A;

[0028] Figure 6 for Figure 4 A magnified view of the structure at B in the middle;

[0029] Figure 7 One of the structural schematic diagrams of the heat conducting member provided in some embodiments of the present application;

[0030] Figure 8 The second schematic diagram of the structure of the heat conducting member provided in some embodiments of the present application.

[0031] Reference numerals:

[0032] Vehicles 1000;

[0033] Battery device 100, controller 200; motor 300;

[0034] Cylindrical battery cell 10;

[0035] Shell 11, housing 111, shell cover 112;

[0036] Roll core 12, center hole 121;

[0037] Heat conducting member 13, temperature balancing section 131, heat transfer section 132, first section 1321, heat transfer sheet 13211, second section 1322;

[0038] Pole 14, seal 15. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0041] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0044] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0045] In the embodiment of the present application, the cylindrical battery cell may be a secondary battery. A secondary battery refers to a cylindrical battery cell that can be continuously used by activating the active material by charging after the cylindrical battery cell is discharged.

[0046] The cylindrical battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0047] The cylindrical battery cell includes a shell, a winding core and an electrolyte, and the shell is used to hold the winding core and the electrolyte. The winding core is composed of a positive electrode sheet, a negative electrode sheet and a separator. The cylindrical battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode collector includes a positive electrode collector body and a positive electrode ear. The positive electrode active material layer is coated on the surface of the positive electrode collector body. The positive electrode ear is not coated with the positive electrode active material layer and protrudes from the positive electrode collector body. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode collector includes a negative electrode collector body and a negative electrode ear. The negative electrode active material layer is coated on the surface of the negative electrode collector body. The negative electrode ear is not coated with the negative electrode active material layer and protrudes from the negative electrode collector body. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current is passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0048] The material of the isolation film can be PP (polypropylene) or PE (polyethylene), etc.

[0049] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using cylindrical battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Cylindrical battery cells are used to store or provide electrical energy.

[0050] The inventors found that in the related art, the heat exchange plate is usually arranged at the bottom or side of multiple cylindrical battery cells, and the outer shell of the cylindrical battery cell directly exchanges heat with the heat exchange plate. The heat in the middle of the core of the cylindrical battery cell relies on the heat conduction ability of the core itself to transfer the heat to the heat exchange interface of the outer shell to exchange heat with the heat exchange plate to achieve an indirect cooling effect. However, in actual applications, the above scheme has a low heat exchange efficiency between the core and the outer shell due to the poor thermal conductivity of the core itself, resulting in the indirect heat exchange effect between the core and the heat exchange plate far from the expected. In this case, the temperature difference between the middle of the core and the position of the core close to the heat exchange plate is too large. This temperature gradient seriously affects the performance and service life of the cylindrical battery cell.

[0051] Based on the above considerations, in order to solve the problem that the charging and discharging performance and life of the soft-pack battery cell are negatively affected by the large temperature difference between the middle position of the core and the position of the core close to the heat exchange plate, the inventor has designed a cylindrical battery cell after in-depth research, including: a shell, a core and a heat conductor. The core is arranged in the shell; the heat conductor includes a connected temperature-averaging section and a heat transfer section, the temperature-averaging section is installed in the center hole of the core, the heat transfer section is attached to the shell, and is attached to a part of the bottom wall of the core, and the bottom wall of the core is not attached to the heat transfer section area for leading out the first pole ear of the core.

[0052] In a cylindrical battery cell of this structure, a heat conductor is inserted into the central hole of the winding core as a core shaft, and the heat conductor is composed of a temperature-averaging section and a heat transfer section. This structure allows the heat inside the winding core to be quickly transferred to the outer shell. With the help of heat exchange between the outer shell and the external heat exchange plate, efficient heat exchange between the inside of the winding core and the external heat exchange plate is achieved, and the temperature difference between the middle position of the winding core and the position of the winding core close to the external heat exchange plate is significantly reduced, thereby improving the uniformity of the overall temperature of the cylindrical battery cell, thereby optimizing the performance of the cylindrical battery cell and extending the service life of the cylindrical battery cell. In addition, the first pole ear at the bottom of the winding core is smoothly led out, taking into account both the high efficiency of heat transfer and the reliability of electrical connection, thereby improving the overall performance of the cylindrical battery cell.

[0053] The battery device mentioned in the embodiments of the present application may include one or more cylindrical battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of cylindrical battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0054] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of cylindrical battery cells.

[0055] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of cylindrical battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of cylindrical battery cells by a cable tie.

[0056] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0057] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0058] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of cylindrical battery cells to the case.

[0059] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0060] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0061] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0062] The battery device involved in the embodiments of the present application can be used in an energy storage device, such as an energy storage container or an energy storage cabinet.

[0063] The embodiment of the present application provides an electric device using a cylindrical battery cell or a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, and a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0064] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0065] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 may be provided at the bottom, head or tail of the vehicle. The battery device 100 may be used to power the vehicle, for example, the battery device 100 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0066] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0067] In the battery device 100, multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in a box; of course, the battery device 100 can also be a battery module formed by multiple battery cells 20 connected in series, in parallel, or in a mixed connection, and multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in a box. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0068] According to some embodiments of the present application, referring to Figure 2-Figure 4 As shown, the present application provides a cylindrical battery cell 10, which includes: a shell 11, a winding core 12 and a heat conductor 13. The winding core 12 is arranged in the shell 11; the heat conductor 13 includes a temperature-averaging section 131 and a heat transfer section 132 connected to each other, the temperature-averaging section 131 is installed in the central hole 121 of the winding core 12, the heat transfer section 132 is attached to the shell 11, and the heat transfer section 132 is attached to a part of the bottom wall of the winding core 12, and the area of ​​the bottom wall of the winding core 12 that is not attached to the heat transfer section 132 is used to lead out the first pole ear of the winding core 12.

[0069] The outer shell 11 is used to accommodate and protect the internal structure of the cylindrical battery cell 10, such as the winding core 12, the heat conductor 13 and the electrolyte, and the outer shell 11 also serves as an interface for heat exchange with an external heat exchange plate.

[0070] The winding core 12 is formed by winding the positive electrode sheet, the negative electrode sheet and the isolation film. As the core part of the cylindrical battery cell 10, the winding core 12 is responsible for the storage and release of electric energy.

[0071] The heat conducting member 13 is used to efficiently conduct the internal center heat of the winding core 12 to the outer shell 11 , and then conduct it to the external heat exchange plate through the outer shell 11 .

[0072] The heat conducting member 13 may be made of a material with high thermal conductivity, such as graphite, graphene, aluminum or copper, etc., which is not limited here.

[0073] In the actual production and processing process, the forming process of the core 12 and the assembly process of the heat conductor 13 can be carried out simultaneously. Specifically, the positive electrode plate, the negative electrode plate and the isolation film and other materials are wound with the heat conductor 13 as the reel. In this way, when the core 12 is formed, at least part of the heat conductor 13 can also be wrapped layer by layer in the middle of the core 12, that is, at the center hole 121, and the outer wall of the heat conductor 13 is tightly fitted with the side wall of the center hole 121 to achieve good and uniform heat transfer. Therefore, compared with the solution of inserting the heat conductor 13 into the center hole 121 after the core 12 is formed, the use of the above method can effectively reduce the risk of curling and damage of the pole piece caused by the later insertion of the heat conductor 13, and maximize the production qualification rate of the cylindrical battery cell 10.

[0074] The temperature-averaging section 131 may be in a shape that matches the shape of the center hole 121 of the winding core 12 , such as a cylindrical shape, so that the temperature-averaging section 131 is in close contact with the interior of the winding core 12 , thereby maximally absorbing and evenly distributing the heat generated inside the winding core 12 .

[0075] The heat transfer section 132 is used to transfer the heat collected and homogenized by the temperature-averaging section 131 to the housing 11, and then to exchange heat with the external heat exchange plate through the housing 11. The design of the heat transfer section 132 should take into account the close fit with the housing 11 to achieve high efficiency of heat transfer. Specifically, the shape and size of the heat transfer section 132 can be optimized according to the structure of the housing 11 and the core 12 to achieve the best heat transfer effect.

[0076] The temperature-averaging section 131 and the heat transfer section 132 can be realized by an integrated design or by a split-and-later connection. Specifically, the integrated design can maintain the integrity and stability of the heat-conducting element 13, while the split-and-later connection provides greater design flexibility, and suitable materials and processing methods can be selected according to actual needs.

[0077] For example, in some embodiments, the temperature-averaging section 131 and the heat transfer section 132 are an integrated structure.

[0078] By setting the above-mentioned temperature-averaging section 131 and heat transfer section 132, uniform distribution of heat inside the winding core 12 is achieved, and local accumulation of heat inside the winding core 12 is reduced, thereby reducing the temperature gradient inside the cylindrical battery cell 10, and at the same time greatly increasing the heat transfer area, so that heat can be efficiently transferred from the temperature-averaging section 131 to the outer shell 11 through the heat transfer section 132, thereby optimizing the heat transfer path and further improving the overall heat exchange efficiency.

[0079] It should be noted that the first electrode tab can be a positive electrode tab or a negative electrode tab, and there is no limitation here.

[0080] Exemplarily, the first electrode tab is a negative electrode tab, that is, a region of the bottom wall of the winding core 12 where the heat transfer section 132 is not attached and is used to lead out the negative electrode tab of the winding core 12 .

[0081] Reference Figure 3 In order to smoothly lead out the first pole ear at the bottom of the winding core 12, the heat transfer section 132 cannot cover the entire bottom wall when it is attached to the bottom wall of the winding core 12. In the actual design of the heat transfer section 132, an appropriate space needs to be reserved, and the space is used to avoid the first pole ear so that the first pole ear can be electrically connected to the housing 11. At the same time, the design of the heat transfer section 132 should also take into account the shape and size of the area attached to the bottom wall of the winding core 12 to maintain the high efficiency of heat transfer and the stability of the structure.

[0082] By designing the heat transfer section 132 to only fit a partial area of ​​the bottom wall of the core 12, the first pole ear at the bottom of the core 12 is smoothly led out, and the interference between heat transfer and electrical connection is reasonably avoided. This design takes into account both the high efficiency of heat transfer and the reliability of electrical connection, thereby improving the overall performance of the cylindrical battery cell 10.

[0083] It is understandable that, referring to Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the temperature-averaging section 131 of the heat conductor 13 is inserted into the central hole 121 of the core 12, directly contacts the pole piece and the diaphragm, and effectively collects the heat generated inside the core 12. At the same time, the heat transfer section 132 of the heat conductor 13 is attached to the outer surface of the core 12 and the outer shell 11 to achieve external heat transfer. The design of the heat conductor 13 enables the heat generated inside the core 12 to be quickly transferred to the outer shell 11 through the heat conductor 13, and heat is exchanged with the external heat exchange plate through the outer shell 11, thereby reducing the thermal resistance between the inside of the core 12 and the external heat exchange plate, and significantly improving the heat conduction efficiency. At the same time, through the effective intervention of the heat conductor 13, the temperature gradient between different positions inside the cylindrical battery cell 10 is reduced, making the temperature distribution inside the cylindrical battery cell 10 more uniform, which helps to improve the performance stability and cycle life of the cylindrical battery cell 10. In addition, the improvement of temperature uniformity reduces the performance degradation and safety hazards caused by local overheating, making the cylindrical battery cell 10 more efficient and safer during the charging and discharging process. In addition, efficient thermal management also reduces material aging caused by thermal stress and prolongs the overall service life of the cylindrical battery cell 10.

[0084] The cylindrical battery cell 10 provided in the embodiment of the present application has a structural design of the heat conductive member 13 consisting of a temperature-averaging section 131 and a heat transfer section 132, so that the heat inside the core 12 can be quickly transferred to the outer shell 11. With the help of the outer shell 11 and the external heat exchange plate in contact with the heat exchange plate, efficient heat exchange between the inside of the core 12 and the external heat exchange plate is achieved, thereby reducing the thermal resistance between the inside of the core 12 and the external heat exchange plate, improving the overall heat exchange efficiency, and effectively reducing the temperature difference between the middle position of the core 12 and the position close to the external heat exchange plate, thereby improving the uniformity of the overall temperature of the cylindrical battery cell 10, helping to improve the performance and service life of the cylindrical battery cell 10, and further improving the overall energy efficiency of the electrical device. In addition, the first pole ear at the bottom of the core 12 is smoothly led out, taking into account both the high efficiency of heat transfer and the reliability of electrical connection, thereby improving the overall performance of the cylindrical battery cell 10.

[0085] According to some embodiments of the present application, referring to Figure 4 and Figure 6-Figure 8 As shown, at least a portion of the heat transfer section 132 is clamped between the bottom wall of the winding core 12 and the housing 11 .

[0086] In this embodiment, reference Figure 4 , Figure 6 and Figure 8 As shown, the heat transfer section 132 is integrally clamped between the bottom wall of the core 12 and the outer shell 11, and the heat transfer section 132 and the temperature-averaging section 131 can be connected at a right angle, and an outer wall surface on one side of the heat transfer section 132 can fit with the bottom wall of the core 12, thereby further increasing the heat transfer area between the heat conductor 13 and the core 12, and an outer wall surface on the other side of the heat transfer section 132 can fit with the inner bottom wall of the outer shell 11.

[0087] In other embodiments, reference Figure 8 As shown, a portion of the heat transfer section 132 is clamped between the bottom wall of the core 12 and the outer shell 11, and the remaining portion can be clamped between other outer wall surfaces of the core 12 and the outer shell 11, thereby further increasing the heat transfer area between the heat conductor 13 and the core 12.

[0088] The cylindrical battery cell 10 provided in the embodiment of the present application directly clamps the heat transfer section 132 between the bottom wall of the core 12 and the outer shell 11 as described above, so that the heat conductor 13 can fit both the inner and outer surfaces of the core 12, further increasing the heat transfer area between the heat conductor 13 and the core 12, reducing the thermal resistance in the heat transfer path as much as possible, and further improving the heat exchange efficiency between the heat conductor 13 and the core 12.

[0089] According to some embodiments of the present application, referring to Figure 7The heat transfer section 132 includes a plurality of heat transfer sheets 13211 that are separated from each other. The plurality of heat transfer sheets 13211 are connected to the outer wall of the temperature-averaging section 131 . The first pole ear of the winding core 12 is electrically connected to the housing 11 through a gap between two adjacent heat transfer sheets 13211 .

[0090] Wherein, a plurality means two or more than two, for example, in some embodiments, reference Figure 7 The heat transfer section 132 includes four heat transfer fins 13211 that are separated from each other. The four heat transfer fins 13211 are connected to the outer wall of the temperature equalizing section 131 .

[0091] Specifically, refer to Figure 7 The distance between any two adjacent heat transfer plates 13211 can be designed to be the same. In this way, when multiple heat transfer plates 13211 are arranged at intervals around the temperature equalizing section 131 and are attached to the bottom wall of the core 12, the heat distribution on the bottom wall of the core 12 can be more uniform, reducing the risk of local overheating of the bottom wall of the core 12.

[0092] The first pole ear based on the winding core 12 is electrically connected to the housing 11 through the gap between two adjacent heat transfer sheets 13211, so that the first pole ear can be led out from multiple areas, which improves the reliability of the electrical connection and reduces the interference of the heat transfer sheet 13211 on the electrical connection path.

[0093] The heat transfer sheet 13211 can be in various shapes, including but not limited to square, triangle, fan ring or other irregular shapes.

[0094] For example, in some embodiments, reference Figure 7 The plurality of heat transfer sheets 13211 are all fan-shaped sheet structures with the bottom center of the uniform temperature section 131 as the center of the circle.

[0095] For example, in some other embodiments, the plurality of heat transfer sheets 13211 are all rectangular sheet structures.

[0096] For example, in some other embodiments, among the plurality of heat transfer plates 13211, a portion of the heat transfer plates 13211 are fan-shaped sheet structures with the bottom center of the temperature-averaging section 131 as the center of the circle, and the remaining portion of the heat transfer plates 13211 are rectangular sheet structures.

[0097] The cylindrical battery cell 10 provided in the embodiment of the present application, through the above-mentioned multiple separately arranged heat transfer sheets 13211, can make the heat distribution on the bottom wall of the winding core 12 more uniform, further reduce the temperature gradient inside the cylindrical battery cell 10, and at the same time greatly increase the heat exchange area between the heat conductor 13 and the outer shell 11, thereby improving the heat dissipation efficiency, and utilize the gap between two adjacent heat transfer sheets 13211 to electrically connect the first electrode ear and the outer shell 11, thereby improving the reliability of the electrical connection, thereby improving the output power and cycle life of the cylindrical battery cell 10.

[0098] According to some embodiments of the present application, referring to Figure 8 The heat transfer section 132 includes a first section 1321 and a second section 1322 that are connected. The first section 1321 is clamped between the bottom wall of the winding core 12 and the outer shell 11 , and the second section 1322 is clamped between the outer wall of the winding core 12 and the outer shell 11 .

[0099] In this embodiment, reference Figure 8 The temperature-averaging section 131 and the first section 1321 can be connected at a right angle, the first section 1321 and the second section 1322 can be bent at a right angle, the temperature-averaging section 131 can be inserted into the core 12, the first section 1321 can be clamped between the bottom wall and the inner wall surface of the outer shell 11, and the second section 1322 can be clamped between the outer wall of the core 12 and the inner wall surface of the outer shell 11. Therefore, the temperature-averaging section 131, the first section 1321 and the second section 1322 can form a continuous heat conduction path, which can not only quickly guide the heat inside the core 12 to the outer shell 11, but also quickly guide the heat on the bottom wall and the outer wall of the core 12 to the outer shell 11, thereby greatly increasing the heat exchange area and further reducing the temperature difference at various locations of the core 12.

[0100] Among them, refer to Figure 7 , and further refer to Figure 8 The first section 1321 may include a plurality of heat transfer plates 13211 that are separated from each other, and a plurality of second sections 1322 may be provided. The plurality of second sections 1322 may be respectively connected to at least part of the plurality of heat transfer plates 13211, wherein the plurality means two or more.

[0101] For example, in some embodiments, reference Figure 7 , and further refer to Figure 8 The first section 1321 may include four heat transfer plates 13211 that are separated from each other, and two second sections 1322 may be provided. The two second sections 1322 may be respectively connected to two heat transfer plates 13211 that are diagonally distributed.

[0102] For example, in some other embodiments, the first section 1321 may include four heat transfer plates 13211 that are separated from each other, and two second sections 1322 may be provided, and the two second sections 1322 may be connected to two adjacent heat transfer plates 13211, respectively.

[0103] For example, in some embodiments, the first section 1321 may include four heat transfer plates 13211 that are separated from each other, four second sections 1322 may be provided, and the four second sections 1322 may be connected to the four heat transfer plates 13211 in a one-to-one correspondence.

[0104] The cylindrical battery cell 10 provided in the embodiment of the present application significantly increases the contact area between the heat conductor 13 and the core 12 by setting the heat transfer section 132 to include the first section 1321 and the second section 1322, which helps to transfer heat to the outer shell 11 and finally to the external heat exchange plate more quickly, while further reducing the temperature difference at various locations of the core 12, thereby maximizing the overall temperature uniformity of the cylindrical battery cell 10.

[0105] According to some embodiments of the present application, referring to Figure 8 The temperature-averaging section 131 is a cylindrical solid body.

[0106] It can be understood that, on the one hand, the cylindrical solid body means that the temperature-averaging section 131 has a large heat conduction area and a continuous heat conduction path. This design enables heat to be transferred more efficiently inside the temperature-averaging section 131, reducing the loss and retention of heat during the transfer process. Therefore, when the heat generated by the core 12 is transferred to the temperature-averaging section 131 through the heat transfer section 132, it can be quickly and evenly distributed throughout the temperature-averaging section 131, and then more effectively transferred to the shell 11. On the other hand, the smooth outer surface can reduce the damage of the temperature-averaging section 131 to the core 12. At the same time, the cylindrical solid body provides additional structural support for the core 12. During the charging and discharging process, due to the influence of internal chemical reactions and temperature changes, the core 12 may experience certain expansion and contraction. The solid design of the temperature-averaging section 131 can disperse these stresses and reduce the collapse of the center hole 121. On the other hand, the cylindrical solid structure has no internal holes, and the overall structure is relatively simple and easy to manufacture and process. This design reduces the complexity and cost of the manufacturing process and improves production efficiency.

[0107] The cylindrical battery cell 10 provided in the embodiment of the present application has the above-mentioned temperature-averaging section 131 as a cylindrical solid body. On the one hand, heat can be transferred more efficiently inside the temperature-averaging section 131, reducing heat loss and retention during the transfer process. On the other hand, it reduces the damage of the temperature-averaging section 131 to the winding core 12, while reducing the collapse of the center hole 121 under long-term use. On the other hand, it is easy to manufacture and process, reducing the complexity and cost of the manufacturing process and improving production efficiency.

[0108] According to some embodiments of the present application, referring to Figure 4 The temperature-averaging section 131 is a cylindrical hollow body.

[0109] By designing the temperature-averaging section 131 as a cylindrical hollow body, on the one hand, heat can be transferred more efficiently inside the temperature-averaging section 131, reducing heat loss and retention during the transfer process; on the other hand, the damage of the temperature-averaging section 131 to the winding core 12 is reduced, while reducing the collapse of the center hole 121 under long-term use; on the other hand, the overall weight of the heat conductor 13 is reduced, thereby reducing the overall weight of the cylindrical battery cell 10, thereby achieving a lightweight design of the cylindrical battery cell 10.

[0110] According to some embodiments of the present application, thermal conductive glue is provided between the heat conducting member 13 and the housing 11 .

[0111] The thermally conductive adhesive may include but is not limited to silicone thermally conductive adhesive, epoxy resin thermally conductive adhesive, acrylic thermally conductive adhesive, polyurethane thermally conductive adhesive or thermally conductive silicone gel, etc., which are not limited here.

[0112] In actual implementation, a layer of thermally conductive adhesive is evenly coated on the contact surface between the heat conductive part 13 and the outer shell 11. The thickness and uniformity of the adhesive layer should be controlled during the coating process to achieve good thermal conductivity and bonding strength. The heat conductive part 13 coated with thermally conductive adhesive is assembled with the outer shell 11 so that the two are in close contact. Then, the thermally conductive adhesive is cured by heating or other curing methods to form a strong bonding layer. The assembled cylindrical battery cell 10 is subjected to quality inspection, including thermal conductivity test, bonding strength test, etc., to ensure that the introduction of thermally conductive adhesive does not reduce the overall performance of the cylindrical battery cell 10.

[0113] The cylindrical battery cell 10 provided in the embodiment of the present application can fill the small gap between the heat conductive member 13 and the outer shell 11 through the provision of the above-mentioned thermal conductive adhesive, reduce thermal resistance, and thus improve the heat transfer efficiency between the heat conductive member 13 and the outer shell 11, thereby helping to transfer the heat generated inside the battery to the outer shell 11 more quickly, and the thermal conductive adhesive can also provide additional bonding strength, which can firmly bond the heat conductive member 13 to the outer shell 11 to prevent loosening due to external factors such as vibration and impact, which helps to improve the overall structural stability of the cylindrical battery cell 10 and extend the service life of the cylindrical battery cell 10.

[0114] According to some embodiments of the present application, referring to Figure 4-Figure 6 As shown, the housing 11 includes a shell 111 and a shell cover 112 connected to each other, the shell cover 112 is electrically connected to the first pole tab of the winding core 12 , and the cylindrical battery cell 10 also includes: a pole 14 and a seal 15 .

[0115] The pole 14 is arranged on the end face of the shell 111, and the pole 14 is electrically connected to the second pole ear of the winding core 12, and the polarities of the first pole ear and the second pole ear are opposite; the end face of the shell 111 has a liquid injection hole, and the seal 15 is arranged in the liquid injection hole, and the seal 15 is separated from the heat conductor 13.

[0116] Reference Figure 4 The shell 111 may be a hood-like structure with an opening on one side, and the shell cover 112 may be used to block the opening of the shell cover 112 to form an accommodating cavity for accommodating the winding core 12 and the heat conducting member 13 .

[0117] The shell cover 112 can be electrically connected to the first electrode tab of the winding core 12 by welding, crimping or other methods to maintain the electrical continuity of the negative electrode of the cylindrical battery cell 10 during the charging and discharging process.

[0118] The pole 14 is an external connection point of the positive electrode of the cylindrical battery cell 10 and is electrically connected to the second pole tab of the winding core 12. The seal 15 can be inserted into the injection hole to block the injection hole to maintain the sealing inside the cylindrical battery cell 10 and reduce the intrusion of gas, liquid or solid pollutants.

[0119] The sealing member may be designed as a sealing pin or other structural forms, which is not limited in the embodiments of the present application.

[0120] The pole 14 can be electrically connected to the second pole tab of the winding core 12 by welding, crimping or other methods to maintain the electrical continuity of the positive electrode of the cylindrical battery cell 10 during the charging and discharging process.

[0121] Among them, one of the first electrode tab and the second electrode tab may be a positive electrode tab, and the other may be a negative electrode tab, which is not limited in the embodiment of the present application.

[0122] For example, in some embodiments, the first pole tab is a negative pole tab, and the second pole tab is a positive pole tab, that is, the shell cover 112 is electrically connected to the negative pole tab of the winding core 12 , and the pole post 14 is electrically connected to the positive pole tab of the winding core 12 .

[0123] It is understandable that the seal 15 and the heat conductor 13 are separated to reduce mutual interference between the seal 15 and the heat conductor 13 and reduce adverse effects of the heat conductor 13 on the seal 15 when transferring heat, such as sealing failure caused by thermal expansion.

[0124] In some embodiments, reference Figure 5 The top surface of the temperature-averaging section 131 may protrude from the top surface of the winding core 12 , but be spaced a certain distance from the sealing member 15 .

[0125] In other embodiments, the top surface of the temperature-averaging section 131 is flush with the top surface of the winding core 12 .

[0126] In some further embodiments, the top surface of the temperature-averaging section 131 is lower than the top surface of the winding core 12 .

[0127] The cylindrical battery cell 10 provided in the embodiment of the present application can reduce the mutual interference between the sealing member 15 and the thermally conductive member 13 by separately arranging the thermally conductive member 13 and the sealing member 15 as described above, thereby reducing potential safety risks such as sealing failure caused by thermal expansion, thereby improving the reliability and stability of the entire cylindrical battery cell 10.

[0128] According to some embodiments of the present application, the present application further provides a battery device 100 , which includes a plurality of cylindrical battery cells 10 and a heat exchange plate according to any of the above schemes, and the heat exchange plate is used for exchanging heat with the cylindrical battery cells 10 .

[0129] The heat exchange plate may be installed at the bottom or side of the plurality of cylindrical battery cells 10 , which is not limited here.

[0130] The heat exchange plate may be a liquid-cooled heat exchange plate, a direct-cooled heat exchange plate or other forms, which is not limited in the embodiments of the present application.

[0131] According to some embodiments of the present application, the present application further provides an electric device, which includes the above battery device 100, which is used to store or provide electric energy.

[0132] The power-consuming device may be any of the aforementioned devices or systems using the battery device 100 .

[0133] According to some embodiments of the present application, see Figure 3-Figure 8As shown, the present application provides a cylindrical battery cell 10, which includes: a shell 11, a winding core 12 and a heat-conducting member 13, wherein the winding core 12 is arranged in the shell 11; the heat-conducting member 13 includes a temperature-averaging section 131 and a heat-transfer section 132 connected to each other, wherein the temperature-averaging section 131 is installed in the central hole 121 of the winding core 12, the heat-transfer section 132 is attached to the shell 11, and the heat-transfer section 132 is attached to a part of the bottom wall of the winding core 12, and the area of ​​the bottom wall of the winding core 12 not attached with the heat-transfer section 132 is used to lead out the first pole ear of the winding core 12, and at least part of the heat-transfer section 132 is clamped between the bottom wall of the winding core 12 and the shell 11. The heat-transfer section 132 includes a plurality of heat-transfer sheets 13211 arranged separately, and the plurality of heat-transfer sheets 13211 are connected to the outer wall of the temperature-averaging section 131, and the first pole ear of the winding core 12 is electrically connected to the shell 11 through the gap between two adjacent heat-transfer sheets 13211. The temperature-averaging section 131 is a cylindrical solid body. A heat-conducting adhesive is provided between the heat-conducting member 13 and the shell 11. The shell 11 includes a shell 111 and a shell cover 112 connected to each other, and the shell cover 112 is electrically connected to the first pole ear of the winding core 12. The cylindrical battery cell 10 also includes: a pole 14 and a seal 15. The pole 14 is provided on the end face of the shell 111, and the pole 14 is electrically connected to the second pole ear of the winding core 12, and the polarities of the first pole ear and the second pole ear are opposite; the end face of the shell 111 has a liquid injection hole, and the seal 15 is provided at the liquid injection hole, and the seal 15 is separated from the heat-conducting member 13.

[0134] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0135] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0136] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cylindrical battery cell, characterized in that: include: shell; A winding core, the winding core being arranged in the outer shell; A heat conductive part, the heat conductive part comprises a connected uniform temperature section and a heat transfer section, the uniform temperature section is installed in the central hole of the winding core, the heat transfer section is fitted with the outer shell and is fitted with a partial area of ​​the bottom wall of the winding core, and the bottom wall of the winding core is not fitted with the heat transfer section area for leading out the first pole ear of the winding core.

2. The cylindrical battery cell according to claim 1, characterized in that: At least a portion of the heat transfer section is clamped between the bottom wall of the winding core and the outer shell.

3. The cylindrical battery cell according to claim 1, characterized in that: The heat transfer section includes a plurality of heat transfer sheets that are separated and arranged, and the plurality of heat transfer sheets are connected to the outer side wall of the temperature-averaging section. The first electrode tab of the winding core is electrically connected to the shell through a gap between two adjacent heat transfer sheets.

4. The cylindrical battery cell according to claim 1, characterized in that: The heat transfer section includes a first section and a second section that are connected, wherein the first section is clamped between the bottom wall of the winding core and the outer shell, and the second section is clamped between the outer side wall of the winding core and the outer shell.

5. The cylindrical battery cell according to claim 1, characterized in that: The temperature-averaging section is a cylindrical solid body.

6. The cylindrical battery cell according to any one of claims 1 to 5, characterized in that: Heat-conducting glue is provided between the heat-conducting component and the shell.

7. The cylindrical battery cell according to any one of claims 1 to 5, characterized in that: The housing includes a shell and a shell cover connected to each other, the shell cover is electrically connected to the first tab of the winding core, and the cylindrical battery cell also includes: A pole, the pole is arranged on the end surface of the shell and is electrically connected to the second pole lug of the winding core, and the polarities of the first pole lug and the second pole lug are opposite; A sealing member, wherein the end surface of the shell has a liquid injection hole, and the sealing member is arranged at the liquid injection hole and is separated from the heat conducting member.

8. A battery device, characterized in that: include: A plurality of cylindrical battery cells according to any one of claims 1 to 7; A heat exchange plate, wherein the heat exchange plate is used to exchange heat with the cylindrical battery cell.

9. An electrical device, characterized in that: Comprising a battery device as claimed in claim 8, the battery device is used to provide electrical energy.

Images