Pole, battery cell and battery

Abstract

The application provides a pole, a battery monomer and a battery, and relates to the technical field of batteries. The pole comprises a pole main body, has at least one accommodating cavity, and contains phase change medium in the accommodating cavity. The phase change medium is configured to change phase when the temperature reaches a preset value. In each accommodating cavity, there is a reserved space above the accommodating cavity before the phase change of the phase change medium. When a large current flows through the pole through a high-voltage busbar, high temperature can cause the phase change of the phase change medium, realize the absorption of heat by the phase change medium, dissipate the heat of the pole, reduce the temperature, avoid the transmission of heat from the pole to the battery main body due to the excessively high temperature of the pole, cause the excessively high local temperature of the battery, and influence the service life and safety of the battery. The purpose of actively controlling the temperature of the pole is achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electrode post, a battery cell, and a battery. Background Technology

[0002] With the accelerated industrialization and upgrading of electric vehicles, their production and sales volume are growing rapidly. However, the charging speed of electric vehicles is one of the core pain points restricting the improvement of user experience and industry development. In order to meet users' urgent needs for shorter charging times, major power battery manufacturers have been increasing the charging rate of power batteries in recent years.

[0003] However, the continuous increase in charging rate has a negative impact on heat generation, which leads to an increase in the operating temperature of the high-voltage busbar in the power battery system. This heat will be transferred to the main body of the battery cell through the connection point with the battery cell terminal, eventually causing the local temperature of the battery cell to be too high, thereby affecting the service life of the battery cell and the overall safety of the product. Utility Model Content

[0004] The purpose of this application is to provide a terminal post, a battery cell, and a battery to solve the technical problem that existing terminal post structures tend to transfer heat to the main body of the battery cell when the battery system generates a large amount of heat, resulting in excessively high local temperatures in the battery cell and affecting the lifespan and safety of the battery cell.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides an electrode post, including an electrode post body, the electrode post body having at least one receiving cavity containing a phase change medium, the phase change medium being configured to undergo a phase change when the temperature reaches a preset value, and each receiving cavity having a reserved space above the receiving cavity before the phase change medium undergoes a phase change.

[0006] In one or more embodiments of this application, the volume of the reserved space is at least sufficient to fill the containment cavity after the phase change medium undergoes a phase change.

[0007] In one or more embodiments of this application, a seal is provided at the top of the receiving cavity, the seal covers the opening of the receiving cavity, and the seal is conductive.

[0008] In one or more embodiments of this application, the central axis of the receiving cavity extends along a third direction; along the third direction, the inner diameter of the receiving cavity is consistent, and on a plane perpendicular to the third direction, the cross-section of the receiving cavity is circular.

[0009] In one or more embodiments of this application, the length of the pole body along the first direction is L, and the inner diameter of the receiving cavity is d, satisfying: d = (0.1~0.15)L; and / or, Along the first direction, the vertical distance from the cavity wall of the receiving cavity to the outer contour of the pole body is b1, satisfying: b1 = (0.15~0.2)L; and / or, The width of the pole body along the second direction is W. Along the second direction, the vertical distance from the cavity wall of the receiving cavity to the outer contour of the pole body is b2, which satisfies: b2 = (0.35~0.45)W, where the first direction, the second direction and the third direction intersect each other.

[0010] In one or more embodiments of this application, the phase change medium includes at least one of paraffin, fatty acid, polyol or hydrated salt of crystallization.

[0011] In one or more embodiments of this application, an isolation layer is coated on the cavity wall of the receiving cavity.

[0012] In one or more embodiments of this application, a receiving cavity is provided, and the central axis of the receiving cavity overlaps with the central axis of the pole body in a third direction; or, The accommodating cavity is provided with at least two, and all accommodating cavities are arranged symmetrically with respect to the pole body along the central axis of the third direction. Along the first direction, the distance between two adjacent accommodating cavities is a, which satisfies: a = (0.4~0.45)L.

[0013] Secondly, this application provides a battery cell including the terminal blocks described in any of the first aspects.

[0014] Thirdly, this application provides a battery, including the battery cell described in the second aspect.

[0015] Based on the above technical solutions, the electrode post, battery cell, and battery of this application have at least the following beneficial technical effects: The electrode post of this application has at least one receiving cavity inside the electrode post body, and a phase change medium is placed in the receiving cavity. Each receiving cavity has a reserved space above the receiving cavity before the phase change medium undergoes a phase change. This allows sufficient volume change space for the phase change medium to undergo a phase change when the electrode post temperature reaches a preset value. At the same time, the phase change medium absorbs heat through the phase change. When a large current flows through the electrode post through the high-voltage busbar, the high temperature can cause the phase change medium to undergo a phase change, realizing the absorption of heat by the phase change medium. This dissipates the heat of the electrode post and reduces its temperature, avoiding the technical problem of the electrode post temperature being too high and transferring heat to the cell body, which would lead to excessively high local temperature of the cell and affect the service life and safety of the cell. This achieves the purpose of actively controlling the electrode post temperature. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the electrical device provided in the embodiments of this application.

[0018] Figure 2 This is a schematic diagram of the battery structure provided in the embodiments of this application.

[0019] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the pole provided in the embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the cross-sectional structure of the pole provided in the embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the cross-sectional structural dimensions of the pole provided in the embodiments of this application.

[0022] In the diagram: 1000 - Vehicle; 1100 - Battery; 1200 - Controller; 1300 - Motor; 10 - Housing; 11 - First Part; 12 - Second Part; 20 - Battery Cell; 1 - Terminal Body; 2 - Receiving Cavity; 3 - Phase Change Medium; 21 - Reserved Space; 22 - Seal. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In related technologies, as the charging rate of power batteries gradually increases, the heat generation increases, leading to a rise in the operating temperature of the high-voltage busbar within the power battery. This heat is ultimately transferred to the main body of the battery cell through the connection points with the terminals, causing localized high temperatures within the cell, thus affecting the cell's lifespan and the overall safety of the product. Existing technologies typically use various cooling systems independent of the cell structure to exchange heat with the cell and control its temperature; however, these systems are not very effective at cooling the terminals themselves.

[0028] Based on the above considerations, in order to address the technical problem that existing electrode structures tend to transfer heat to the main cell when the battery system generates a large amount of heat, leading to excessively high local temperatures in the cell and affecting its lifespan and safety, this application provides an electrode, a battery cell, and a battery.

[0029] It should be noted that the electrode disclosed in this application is applicable to electrical devices that use batteries as a power source or various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0030] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0031] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery 1100 is disposed inside the vehicle 1000, and the battery 1100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 1100 can be used to power the vehicle 1000; for example, the battery 1100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery 1100 to supply power to the motor 1300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0032] In some embodiments of this application, the battery 1100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0033] Please refer to Figure 2 As one embodiment of the battery 1100, the battery 1100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the battery housing 10. The housing 10 provides a space for the battery cell 20 and can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0034] In battery 1100, there can be multiple battery cells 20. Multiple battery cells 20 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that multiple battery cells 20 are connected in both series and parallel.

[0035] In one embodiment, multiple battery cells 20 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 1100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a hybrid configuration to create a battery module, and then connecting multiple battery modules in series, parallel, or in a hybrid configuration to form a whole, which is then housed within the housing 10. The battery 1100 may also include other structures; for example, it may include a busbar for electrical connection between the multiple battery cells 20.

[0036] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0037] A battery cell 20 refers to the smallest unit that makes up a battery. A battery cell 20 includes a casing, electrode assemblies, and other functional components. The casing includes an end cap assembly and an outer shell. The end cap assembly is a component that closes onto the opening of the outer shell to isolate the internal environment of the battery cell from the external environment. The end cap assembly includes an end cap that closes onto the opening of the outer shell. The shape of the end cap can be adapted to the shape of the outer shell to fit it. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is less prone to deformation under pressure and impact, allowing the battery cell to have higher structural strength and improved safety performance. The end cap can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, the end cap can be provided with functional components such as terminals. The terminals can be electrically connected to the electrode assembly via a busbar for outputting or inputting electrical energy from the battery cell.

[0038] The outer casing is a component used to cooperate with the end cap to form the internal environment of the battery cell 20. This internal environment can accommodate electrode components, electrolyte, and other components. The outer casing and end cap can be independent components. An opening can be provided on the outer casing, and the end cap closes the opening to form the internal environment of the battery cell 20. Specifically, the end cap and outer casing can form a common connection surface before other components are inserted into the casing. When it is necessary to encapsulate the interior of the casing, the end cap closes the casing. The outer casing can have various shapes and sizes, such as cylindrical, cuboid, hexagonal prism, etc. Specifically, the shape of the outer casing can be determined according to the specific shape and size of the electrode components. The material of the outer casing can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0039] As one embodiment of the pole, such as Figures 3 to 5As shown, the pole includes a pole body 1, the pole body 1 has at least one receiving cavity 2, the receiving cavity 2 contains a phase change medium 3, the phase change medium 3 is configured to undergo a phase change when the temperature reaches a preset value, and each receiving cavity 2 has a reserved space 21 above the receiving cavity 2 before the phase change medium 3 undergoes a phase change.

[0040] It should be noted that the electrode in this application can be either a positive electrode or a negative electrode. When used as a positive electrode, the electrode body 1 can be made of aluminum alloy. When used as a negative electrode, the electrode body 1 can be made of copper-aluminum composite material or copper. The shape of the electrode body 1 can be a cuboid or a cylinder. In this embodiment, the electrode body 1 is cuboid. The receiving cavity 2 is a cavity structure formed inside the electrode body 1, that is, a cavity formed by the absence of some material inside the electrode body 1, used to contain the phase change medium 3. The receiving cavity 2 can be a cavity with an opening at at least one end to facilitate the insertion of the phase change medium 3. The phase change medium 3 is a substance that can undergo a phase change when the ambient temperature reaches a preset value, such as changing from a solid to a liquid or from a liquid to a gas. Before the phase change medium 3 undergoes a phase change, there is a reserved space 21 above the receiving cavity. It can be understood that before the phase change medium 3 undergoes a phase change, the phase change medium 3 does not completely fill the receiving cavity 2, and there is a certain reserved space 21 above the phase change medium 3.

[0041] In the technical solution of this application embodiment, at least one receiving cavity 2 is provided in the electrode body 1, and a phase change medium 3 is provided in the receiving cavity 2. In each receiving cavity 2, before the phase change medium 3 undergoes a phase change, there is a reserved space 21 above the receiving cavity 2, so as to reserve sufficient volume change space for the phase change medium 3 to undergo a phase change when the temperature of the electrode reaches a preset value. At the same time, the phase change medium 3 absorbs heat through the phase change. When a large current flows through the electrode through the high voltage busbar, the high temperature can cause the phase change medium 3 to undergo a phase change, realizing the absorption of heat by the phase change medium 3, so that the heat of the electrode dissipates and the temperature decreases. This avoids the technical problem that the temperature of the electrode is too high and the heat is transferred to the cell body, resulting in the cell's local temperature being too high and affecting the cell's service life and safety. This achieves the purpose of actively controlling the temperature of the electrode.

[0042] It should be noted that the first direction, the second direction, and the third direction of this application intersect each other. In some embodiments, the first direction, the second direction, and the third direction are perpendicular to each other. The first direction of this application can be the length direction of the pole body 1, that is, the length direction of the end cap assembly; the second direction can be the width direction of the pole body 1, that is, the width direction of the end cap assembly; and the third direction can be the height direction or the thickness direction of the pole body 1, that is, the thickness direction of the end cap assembly.

[0043] Since the phase change medium 3 will increase in volume when it undergoes a phase change, such as changing from solid to liquid, in order to ensure that the phase change medium 3 can fill the entire containment cavity 2 after the phase change and avoid affecting heat exchange and heat absorption, in some embodiments, the reserved space 21 is at least large enough for the phase change medium 3 to fill the containment cavity 2 after the phase change, so that the phase change medium 3 can fill the entire containment cavity 2 after the phase change, thereby improving heat absorption, allowing the electrode to be cooled down in time, and improving the safety of the entire battery cell.

[0044] In some embodiments, the receiving cavity 2 may have an opening only at its top, and the bottom of the receiving cavity 2 may be integrally connected to the pole body 1. In some embodiments, such as... Figure 3 As shown, a sealing element 22 is provided at the top of the receiving cavity 2, covering the opening of the receiving cavity 2. This seals the opening of the receiving cavity 2, preventing the phase change medium from overflowing from the electrode body 1 after a phase change, thus keeping it sealed within the receiving cavity 2 and improving the lifespan of the battery cell. In some other embodiments, the receiving cavity 2 may also have openings at both the top and bottom. In this embodiment, before filling the receiving cavity 2 with the phase change medium 3, the bottom opening of the receiving cavity 2 needs to be sealed with the sealing element 22 first, then the phase change medium 3 is added to the receiving cavity 2, and then the top opening of the receiving cavity 2 is sealed with the sealing element 22, so that the phase change medium 3 can be sealed within the receiving cavity 2, avoiding any impact on other structural components.

[0045] In some embodiments, the seal 22 is conductive. For example, the seal 22 may be made of the same material as the electrode body 1 so that current can still pass through the seal 22 when the electrode body 1 is connected to a busbar or other electrical connector, thereby reducing the impact on the current carrying capacity of the electrode body 1.

[0046] In some embodiments, along a third direction, the thickness of the pole body 1 is h1, and the thickness of the seal 22 is (0.15~0.2)h1. This facilitates sealing the opening of the receiving cavity 2 using the seal 22.

[0047] In some embodiments, such as Figure 3 As shown, the central axis of the receiving cavity 2 extends along a third direction, and the inner diameter of the receiving cavity 2 is consistent along the third direction. It can be understood that the receiving cavity 2 can be a cylindrical cavity. This arrangement facilitates the uniform filling of the receiving cavity 2 with the phase change medium 3 when the temperature reaches the preset value, so as to uniformly absorb the heat of the electrode body 1 and achieve uniform cooling of the electrode.

[0048] In some embodiments, such as Figure 4As shown, the cross-section of the receiving cavity 2 is circular on a plane perpendicular to the third direction. This arrangement allows the phase change medium 3 inside the receiving cavity 2 to uniformly absorb the heat around the receiving cavity 2, enabling the phase change medium 3 to undergo a complete phase change, thereby reducing the temperature of the electrode column.

[0049] In some embodiments, such as Figure 5 As shown, the length of the electrode body 1 along the first direction is L, and the inner diameter of the receiving cavity 2 is d, satisfying: d = (0.1~0.15)L. This setting allows the phase change medium 3 contained in the receiving cavity 2 to absorb as much heat as possible, thus achieving timely cooling of the electrode, while ensuring that the setting of the phase change medium 3 does not affect the flow capacity of the electrode body 1.

[0050] In some embodiments, the length of the electrode body 1 along the first direction is L, and the vertical distance from the cavity wall of the receiving cavity 2 to the outer contour of the electrode body 1 along the first direction is b1, satisfying: b1 = (0.15~0.2)L. That is, on any plane perpendicular to the third direction, b1 is the minimum distance between the cavity wall of the receiving cavity 2 and the outer contour of the electrode body 1 along the first direction. This setting allows the phase change medium contained in the receiving cavity 2 to absorb as much heat as possible, reducing the temperature of the electrode, while ensuring that it does not affect the flow capacity and structural strength of the electrode body 1.

[0051] In some embodiments, the width of the pole body 1 along the second direction is W, and the vertical distance from the cavity wall of the receiving cavity 2 to the outer contour of the pole body 1 along the second direction is b2, satisfying: b2 = (0.35~0.45)W. That is, on any plane perpendicular to the third direction, b2 is the minimum distance between the cavity wall of the receiving cavity 2 and the outer contour of the pole body 1 along the second direction. This setting allows the phase change medium contained in the receiving cavity 2 to absorb as much heat as possible, reducing the temperature of the pole, while not affecting the flow capacity and structural strength of the pole body 1.

[0052] In some embodiments, when the receiving cavity 2 includes one cavity, the central axis of the receiving cavity 2 overlaps with the central axis of the pole body 1 along a third direction. It is understood that in this embodiment, the central axis of the receiving cavity 2 coincides with the central axis of the pole body 1 along a third direction, and the receiving cavity 2 is symmetrically arranged about its central axis. In other embodiments, when the receiving cavity 2 includes at least two cavities, all receiving cavities 2 are symmetrically arranged relative to the central axis of the pole body 1 along a third direction. Multiple receiving cavities 2 can be spaced apart along a first direction of the pole body 1, or they can be symmetrically arranged at intervals along both the first and second directions of the pole body 1. For example, in this embodiment, two receiving cavities 2 are provided on the pole body 1, the two receiving cavities 2 are spaced apart along the first direction, and are symmetrically arranged about the central axis of the pole body 1 along a third direction. In other embodiments, the receiving cavity 2 can also include four cavities, the four receiving cavities 2 are symmetrically arranged about the central axis of the pole body 1 along a third direction. For example, the four receiving cavities 2 can be arranged sequentially at intervals along the first direction, or they can be arranged in a rectangular matrix with intervals along both the first and second directions. In this way, the phase change medium in the cavity 2 can uniformly absorb heat from different locations, so that the electrode body 1 absorbs heat and the overall temperature remains uniform, avoiding the problem of excessively high local temperatures.

[0053] In some embodiments, on a plane perpendicular to the third direction, the sum of the cross-sectional areas of all receiving cavities 2 is no greater than 5 square millimeters to ensure the flow area requirement of the pole body 1.

[0054] In some embodiments, the length of the electrode body 1 along the first direction is L, and the distance between two adjacent receiving cavities 2 is a, satisfying: a = (0.4~0.45)L. This allows the phase change medium within the receiving cavity 2 to uniformly absorb heat from different locations, ensuring that the electrode body 1 absorbs heat and maintains a uniform overall temperature, thus avoiding the problem of excessively high local temperatures.

[0055] In some embodiments, the phase change temperature of the phase change medium 3 can be between 45°C and 85°C. For example, the phase change temperature of the phase change medium 3 is 45°C, 46°C, 48°C, 50°C, 52°C, 55°C, 57°C, 60°C, 65°C, 70°C, 75°C, 80°C, or 85°C. By setting the phase change temperature of the phase change medium 3 to 45°C to 85°C, the phase change temperature of the phase change medium 3 can be within the temperature range of the electrode when the battery is operating. Thus, when the battery is operating, the phase change medium 3 located within the electrode can undergo a phase change, thereby absorbing heat from the electrode and cooling it down. In some embodiments, the phase change medium 3 includes at least one of paraffin wax, fatty acid, polyol, or hydrated salt.

[0056] In some embodiments, an isolation layer is coated on the cavity wall of the receiving cavity 2. The isolation layer may be an anti-corrosion coating coated on the cavity wall of the receiving cavity 2 to isolate the phase change medium 3 from the electrode body 1, thereby preventing the phase change medium 3 from reacting chemically with the electrode body 1 and thus improving the stability and service life of the electrode.

[0057] In some embodiments, the material of the isolation layer may be at least one of nickel-plated alloy coating, zinc-rich coating, inorganic composite nano-ceramic coating, and epoxy resin.

[0058] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrode post, characterized in that, include: The electrode body has at least one receiving cavity containing a phase change medium configured to undergo a phase change when the temperature reaches a preset value. Each receiving cavity has a reserved space above it before the phase change medium undergoes a phase change.

2. The pole post according to claim 1, characterized in that, The volume of the reserved space is at least sufficient to fill the cavity after the phase change medium undergoes a phase change.

3. The pole post according to claim 2, characterized in that, The top of the receiving cavity is provided with a seal that covers the opening of the receiving cavity, and the seal is conductive.

4. The pole post according to any one of claims 1 to 3, characterized in that, The central axis of the receiving cavity extends along a third direction, and the inner diameter of the receiving cavity is consistent along the third direction. On a plane perpendicular to the third direction, the cross-section of the receiving cavity is circular.

5. The electrode post according to claim 4, characterized in that, The length of the pole body along the first direction is L, and the inner diameter of the receiving cavity is d, satisfying: d = (0.1~0.15)L; and / or, Along the first direction, the vertical distance from the cavity wall of the receiving cavity to the outer contour of the pole body is b1, satisfying: b1 = (0.15~0.2)L; and / or, The width of the pole body along the second direction is W. Along the second direction, the vertical distance from the cavity wall of the receiving cavity to the outer contour of the pole body is b2, satisfying: b2 = (0.35~0.45)W, where the first direction, the second direction and the third direction intersect each other.

6. The pole post according to claim 1, characterized in that, The phase change medium includes at least one of paraffin, fatty acid, polyol or hydrated salt of crystallization.

7. The pole post according to claim 1, characterized in that, An insulating layer is coated on the cavity wall of the receiving cavity.

8. The pole post according to claim 1, characterized in that, The cavity is provided, and the central axis of the cavity overlaps with the central axis of the pole body in a third direction. Alternatively, the receiving cavity is provided with at least two, and all the receiving cavities are arranged symmetrically with respect to the pole body along the central axis of the third direction. Along the first direction, the distance between two adjacent receiving cavities is a, which satisfies: a = (0.4~0.45)L.

9. A single battery cell, characterized in that, Includes the pole as described in any one of claims 1 to 8.

10. A battery, characterized in that, Includes the battery cell as described in claim 9.

Images