Battery cell, battery device, and electric device

Abstract

The application provides a battery cell, a battery device and a power utilization device. The battery cell comprises a shell, an electrode assembly, a conductive piece, an insulating piece and a pole. The shell comprises a first wall, and the electrode assembly is arranged in the shell; the conductive piece is arranged on a side of the first wall away from the electrode assembly, and a front surface of the conductive piece is provided with a first groove; the insulating piece is at least partially arranged between the conductive piece and the first wall; the pole penetrates through the first wall and the insulating piece, and the pole is electrically connected with the electrode assembly and the conductive piece; one of the insulating piece and the conductive piece is provided with a second groove, and the other is provided with a protrusion; when the conductive piece is assembled on the insulating piece in a posture with the front surface away from the insulating piece, the protrusion is embedded in the second groove; when the conductive piece is assembled on the insulating piece in a posture with the front surface facing the insulating piece, the protrusion interferes with the conductive piece, or the protrusion interferes with the insulating piece. The application can improve the reliability of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In battery technology, the reliability of individual battery cells is a crucial issue. Therefore, improving the reliability of individual battery cells is a highly significant concern in battery technology. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device to improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a conductive element, an insulating element, and a terminal post. The casing includes a first wall; the electrode assembly is disposed within the casing; the conductive element is disposed on the side of the first wall opposite to the electrode assembly, and the conductive element has a first groove; the insulating element is at least partially disposed between the conductive element and the first wall; the terminal post penetrates the first wall and the insulating element, and the terminal post is electrically connected to the electrode assembly and the conductive element; wherein, one of the insulating element and the conductive element has a second groove, and the other has a protrusion; when the conductive element is assembled on the insulating element with its front facing away from the insulating element, the protrusion is embedded in the second groove; when the conductive element is assembled on the insulating element with its front facing the insulating element, the protrusion interferes with the conductive element, or the protrusion interferes with the insulating element.

[0006] By providing a second groove in one of the insulating and conductive components and a protrusion in the other, when the conductive component is assembled on the insulating component with its front facing away from the insulating component, the protrusion is embedded in the second groove; when the conductive component is assembled on the insulating component with its front facing the insulating component, the protrusion interferes with the conductive component, or vice versa. This not only solves the problem of the conductive component being installed backwards, but also limits the displacement of the conductive component relative to the insulating component by the cooperation of the protrusion and the second groove. Therefore, it reduces or eliminates the risk of poor sealing between the conductive and insulating components caused by reversed installation, improving the reliability of the battery cell.

[0007] In some embodiments, the insulating member includes a bottom wall and a peripheral wall, the bottom wall being disposed between the first wall and the conductive member, the peripheral wall surrounding the outer periphery of the conductive member, and the peripheral wall being connected to the bottom wall; wherein, one of the inner peripheral surface of the peripheral wall and the outer peripheral surface of the conductive member is provided with a second groove, and the other is provided with a protrusion.

[0008] A second groove is provided on one of the inner circumferential surface of the insulating component and the outer circumferential surface of the conductive component, and a protrusion is provided on the other. When the conductive component is assembled with the insulating component, the protrusion can form a lateral engagement with the second groove, providing a continuous guiding effect, reducing the risk of conductive component misalignment, and further improving the reliability of the battery cell.

[0009] In some embodiments, the inner peripheral surface of the peripheral wall is provided with a protrusion, and the outer peripheral surface of the conductive element is provided with a second groove; one end of the second groove extends to the back side of the conductive element.

[0010] The second groove extends to the back of the conductive component. When the conductive component is assembled on the insulating component with its front facing away from the insulating component, that is, when the conductive component is assembled on the insulating component with its back facing away from the insulating component, the protrusion can be smoothly embedded in the second groove, improving assembly efficiency.

[0011] In some embodiments, the other end of the second groove is spaced apart from the front side of the conductive element.

[0012] The other end of the second groove is spaced apart from the front of the conductive component. When the first protrusion is located in the middle of the insulating component along the length or width direction, it can also prevent the conductive component from being installed backwards, which can also improve the reliability of the battery cell.

[0013] In some embodiments, one end of the protrusion is connected to the bottom wall; along the length direction of the insulating element, the protrusion is located at the center of the peripheral wall; along the length direction of the conductive element, the second groove is located at the center of the conductive element.

[0014] Therefore, there is no gap between the first protrusion and the bottom wall, which improves the sealing effect between the conductive and insulating components, and facilitates the installation and positioning of the first protrusion and the second groove, thus improving installation efficiency.

[0015] In some embodiments, the groove is adapted to the protrusion.

[0016] By adapting the second groove to the protrusion, the protrusion can be smoothly embedded in the second groove, and the two fit more tightly, which can reduce the risk of displacement of conductive components, improve the positioning accuracy of conductive components and terminals, thereby improving connection reliability and thus improving the reliability of battery cells.

[0017] In some embodiments, the groove and the protrusion are in clearance engagement.

[0018] The second groove and the protrusion are fitted with a gap, which allows the protrusion to be smoothly inserted into the second groove when the conductive component is correctly assembled, so that the conductive component can be assembled in place, reducing assembly resistance, and also reducing the risk of the operator mistakenly thinking that it is installed backwards.

[0019] In some embodiments, the gap between the groove and the protrusion is less than or equal to 0.02 mm.

[0020] By ensuring that the gap between the second groove and the protrusion is less than or equal to 0.02 mm, the protrusion can be smoothly embedded into the second groove, allowing the conductive component to be assembled in place. This also reduces the risk of the conductive component shifting or displacing, further improving the reliability of the battery cell.

[0021] In some embodiments, the insulating member is provided with a first through hole; the conductive member is provided with a second through hole corresponding to the first through hole, the second through hole penetrating the bottom wall of the first groove; the pole passes through the first through hole and the second through hole and is riveted to the conductive member.

[0022] The electrode post is riveted to the conductive component, and a portion of the electrode post is embedded in the first groove to improve connection reliability.

[0023] In some embodiments, the electrode assembly includes a positive electrode tab; the electrode post is connected to the positive electrode tab.

[0024] Since the difference between the front and back of the conductive component connected to the positive terminal is small, the probability of it being installed backwards is greater. By setting a protrusion and a second groove on the conductive component and the insulating component connected to the positive terminal respectively, the risk of the positive conductive component being installed backwards can be reduced.

[0025] In some embodiments, the housing includes a shell and an end cap, the shell having a storage space for receiving the electrode assembly, the end cap covering the opening of the shell, and the end cap being the first wall.

[0026] Using the end cap as the first wall facilitates the assembly of the electrode and conductive components, improving manufacturing efficiency.

[0027] Secondly, embodiments of this application provide a battery device, including a battery cell from any of the embodiments of the first aspect.

[0028] Thirdly, embodiments of this application provide an electrical device, including a battery cell of any one of the embodiments of the first aspect or a battery device of the second aspect.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0032] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0033] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0034] Figure 4 An exploded view of the end cap assembly of a battery cell provided in some embodiments of this application;

[0035] Figure 5 A schematic diagram of the structure of the insulating component of a battery cell provided in some embodiments of this application;

[0036] Figure 6 A schematic diagram of the structure of the conductive components of a battery cell provided in some embodiments of this application;

[0037] Figure 7 A schematic diagram of the end cap assembly of a battery cell provided in some embodiments of this application;

[0038] Figure 8 for Figure 7 A schematic diagram of the cross-section of section AA;

[0039] Figure 9 for Figure 8 A magnified view of part B in the middle.

[0040] icon:

[0041] 1000 - Vehicle; 100 - Battery assembly; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Outer casing; 211 - Housing; 212 - End cap; 213 - First wall; 22 - Electrode assembly; 222 - Tab; 23 - Conductive component; 23a - Front; 23b - Back; 23c - Outer peripheral surface; 231 - Second groove; 232 - Second through hole; 233 - First groove; 24 - Insulator; 242 - Bottom wall; 243 - Peripheral wall; 244 - First through hole; 241 - Protrusion; 25 - Terminal post; 26 - Insulating ring; 27 - Pressure relief mechanism. Detailed Implementation

[0042] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having" and any variations thereof in the description of this application and the foregoing drawings are intended to cover non-exclusive inclusion.

[0044] The terms "first," "second," etc., in the specification and the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0045] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0049] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0050] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0051] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0052] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0053] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0054] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0055] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0056] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0057] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0058] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0059] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0060] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0061] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), or composite metal (such as a copper-aluminum composite housing).

[0062] In some embodiments, the housing includes an end cap assembly and a housing with an opening. The end cap assembly includes an end cap and electrode terminals disposed on the end cap. The end cap closes the opening to form a sealed space for accommodating the electrode assembly and substances such as electrolytes. The housing may have one or more openings. One or more end caps may also be provided.

[0063] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be disposed on the end cap or on the housing.

[0064] In some embodiments, the electrode terminal may include a post and a conductive element, the post being electrically connected to the conductive element and the electrode assembly.

[0065] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell, and the explosion-proof valve can be provided on the end cap or on the housing.

[0066] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0067] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0068] The electrode terminals of a battery cell can be connected by riveting. Before riveting the electrode terminals, conductive components (such as riveting blocks) need to be assembled onto insulating components (such as the plastic component above). Correct assembly of the conductive and insulating components is a crucial step in ensuring the airtightness of the battery cell. If the conductive component is installed backwards—that is, with the riveting groove facing the insulating component—a continuous sealing interface cannot be formed between the riveting groove and the insulating component, resulting in poor sealing. This can create leakage paths within the battery cell, which not only disrupt the internal environment but may also introduce moisture and impurities, leading to abnormal electrochemical reactions and adversely affecting the battery cell's performance and lifespan. Furthermore, airtightness issues can also cause risks such as short circuits and thermal runaway, and in severe cases, may even lead to explosions or fires, thereby reducing the reliability of the battery cell.

[0069] To address this issue, this application provides a battery cell with a second groove on one of the insulating and conductive components and a protrusion on the other. When the conductive component is assembled onto the insulating component with its front facing away from the insulating component, the protrusion is embedded in the second groove. When the conductive component is assembled onto the insulating component with its front facing the insulating component, the protrusion interferes with the conductive component, or vice versa. This not only solves the problem of the conductive component being installed backwards, but also limits the displacement of the conductive component relative to the insulating component by the cooperation between the protrusion and the second groove. Therefore, it reduces or eliminates the risk of poor sealing between the conductive and insulating components caused by reversed installation, thus improving the reliability of the battery cell.

[0070] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0071] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0072] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0073] Reference Figure 1 Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery unit 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery unit 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation.

[0074] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0075] In some embodiments of this application, the battery device 100 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.

[0076] Reference Figure 2 The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, collectively defining a storage space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the storage space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 overlapping the open side of the second sub-housing 12.

[0077] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells.

[0078] Reference Figure 3 The battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. The housing 21 may include a casing 211 and an end cap 212. The casing 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0079] The housing 211 is an assembly used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 may contain one or more electrode assemblies 22. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0080] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved reliability. The material of end cap 212 can also 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. In some embodiments, an insulating structure can also be provided on the inner side of end cap 212. The insulating structure can be used to isolate the electrical connection components inside housing 211 from end cap 212 to reduce the risk of short circuit. For example, the insulating structure can be plastic, rubber, etc.

[0081] Below, refer to Figures 3 to 9 The battery cell 20 of the present application embodiment will be described in detail.

[0082] The outer casing 21 includes a first wall 213. The electrode assembly 22 is disposed within the outer casing 21. The battery cell 20 may further include a conductive element 23, an insulating element 24, and a terminal post 25. The conductive element 23 is disposed on the side of the first wall 213 opposite to the electrode assembly 22, and a first groove 233 is provided on the front surface 23a of the conductive element 23. The insulating element 24 is at least partially disposed between the conductive element 23 and the first wall 213. The terminal post 25 penetrates the first wall 213 and the insulating element 24, and the terminal post 25 electrically connects the electrode assembly 22 and the conductive element 23. One of the insulating member 24 and the conductive member 23 is provided with a second groove 231, and the other is provided with a protrusion 241. When the conductive member 23 is assembled on the insulating member 24 with its front 23a facing away from the insulating member 24, the protrusion 241 is embedded in the second groove 231. When the conductive member 23 is assembled on the insulating member 24 with its front 23a facing the insulating member 24, the protrusion 241 interferes with the conductive member 23, or the protrusion interferes with the insulating member 24.

[0083] The housing 21 may include a housing 211 and an end cap 212, the housing 211 having an opening and the end cap 212 covering the opening. The first wall 213 may be a wall portion of the housing 211, or the first wall 213 may be the end cap 212. Figure 3 The diagram shows the case where the first wall 213 is an end cap 212.

[0084] The electrode assembly 22 can be a wound structure or a stacked structure. The battery cell 20 can be a square battery cell 20; for example, the electrode assembly 22 can be flat. The thickness direction of the electrode assembly 22 can be perpendicular to the thickness direction Z of the first wall. When the electrode assembly 22 is a wound structure, the electrode assembly 22 includes a straight region and a bent region, and the thickness direction of the electrode assembly 22 is parallel to the stacking direction of the electrode sheets in the straight region. When the electrode assembly 22 is a stacked structure, the thickness direction of the electrode assembly 22 is parallel to the stacking direction of the electrode sheets.

[0085] The conductive element 23 and the terminal post 25 can constitute the electrode terminals of the battery cell 20 for outputting or inputting electrical energy. The conductive element 23 may have a portion exposed outside the first wall 213 so that the conductive element 23 can be connected to a busbar component. The conductive element 23 can be square, cylindrical, or other shapes. The material of the conductive element 23 can be conductive materials such as aluminum, copper, steel, aluminum alloy, or copper-aluminum alloy.

[0086] The insulating member 24 may be partially disposed between the conductive member 23 and the first wall 213, for example, referring to Figure 5 The insulating member 24 includes a bottom wall 242 and a peripheral wall 243. The bottom wall 242 is disposed between the conductive member 23 and the first wall 213, and the peripheral wall 243 is disposed on the outer periphery of the conductive member 23.

[0087] The insulating element 24 can be entirely disposed between the conductive element 23 and the first wall 213. For example, the insulating element can be in the form of a plate structure, and the two sides of the insulating element 24 along the thickness direction of the plate structure abut against the conductive element 23 and the first wall 213 respectively.

[0088] The insulating component 24 can be made of insulating materials such as plastic, rubber, or ceramic.

[0089] The electrode post 25 can be directly connected to the tab 222 of the electrode assembly 22, or connected to the tab 222 via an adapter. The electrode post 25 can be connected to the positive tab of the electrode assembly 22, thus making the electrode post 25 a positive electrode post; alternatively, the electrode post 25 can be connected to the negative tab of the electrode assembly 22, thus making the electrode post 25 a negative electrode post. In this embodiment, the electrode post 25 can be either a positive or negative electrode post. Figure 3 and Figure 4 This shows the case where pole 25 is the positive pole.

[0090] The electrode post 25 and the conductive component 23 can be connected by riveting, bonding, welding, or other methods. In this embodiment, the electrode post 25 and the conductive component 23 are riveted. The shape of the electrode post 25 can be square, cylindrical, or partially square and partially cylindrical, etc. This embodiment does not impose any particular limitation on the shape of the electrode post 25. The electrode post 25 is made of conductive materials such as aluminum, copper, steel, aluminum alloy, or copper-aluminum alloy.

[0091] The insulating member 24 may be provided with a second groove 231, and the conductive member 23 may be provided with a protrusion 241 corresponding to the second groove 231. Alternatively, the insulating member 24 may be provided with a protrusion 241, and the conductive member 23 may be provided with a second groove 231 corresponding to the protrusion 241. The second groove 231 and the protrusion 241 correspond to each other, which may be in terms of position and / or size.

[0092] Taking an example where the insulating member 24 has a protrusion 241 and the conductive member 23 has a second groove 231 that mates with the protrusion 241, the protrusion 241 can be located on the bottom wall 242 or the peripheral wall 243 of the insulating member 24. When the protrusion 241 is located on the bottom wall 242 of the insulating member 24, the second groove 231 is located on the back surface 23b of the conductive member 23 facing the bottom wall 242. When the protrusion 241 is located on the peripheral wall 243 of the insulating member 24, the second groove 231 is located on the outer peripheral surface 23c of the conductive member 23.

[0093] As an example, the front side 23a of the conductive element 23 can be the side with the first groove 233 (riveting groove). When the electrode post 25 is riveted to the conductive element 23, a portion of the electrode post 25 is embedded in the first groove 233, improving connection reliability. The back side 23b of the conductive element 23 can be a flat surface.

[0094] The correct installation orientation for conductive component 23 is when its front side 23a faces away from insulating component 24. The incorrect installation orientation for conductive component 23 is when its front side 23a faces insulating component 24.

[0095] When the insulating member 24 is provided with a protrusion 241 and the conductive member 23 is provided with a second groove 231, when the conductive member 23 is assembled on the insulating member 24 with its front side 23a facing away from the insulating member 24, the protrusion 241 is embedded in the second groove 231, so that the conductive member 23 can be smoothly assembled on the insulating member 24; when the conductive member 23 is assembled on the insulating member 24 with its front side 23a facing the insulating member 24, the protrusion 241 interferes with the conductive member 23, so as to prevent the conductive member 23 from being assembled on the insulating member 24. The protrusion 241 can be integrally formed with the insulating member 24.

[0096] When the insulating member 24 is provided with a second groove 231 and the conductive member 23 is provided with a protrusion 241, when the conductive member 23 is assembled on the insulating member 24 with its front side 23a facing away from the insulating member 24, the protrusion 241 is embedded in the second groove 231, so that the conductive member 23 can be smoothly assembled on the insulating member 24; when the conductive member 23 is assembled on the insulating member 24 with its front side 23a facing the insulating member 24, the protrusion 241 interferes with the insulating member 24, so as to prevent the conductive member 23 from being assembled on the insulating member 24. The protrusion 241 can be integrally formed with the conductive member 23.

[0097] The number of protrusions 241 and the number of second grooves 231 are matched, and one or more can be provided.

[0098] By providing a second groove 231 on one of the insulating member 24 and the conductive member 23, and a protrusion 241 on the other, when the conductive member 23 is assembled on the insulating member 24 with its front 23a facing away from the insulating member 24, the protrusion 241 is embedded in the second groove 231; when the conductive member 23 is assembled on the insulating member 24 with its front 23a facing the insulating member 24, the protrusion 241 interferes with the conductive member 23, or the protrusion 241 interferes with the insulating member 24. This not only solves the problem of the conductive member 23 being installed backwards, but also restricts the displacement of the conductive member 23 relative to the insulating member 24 by the cooperation of the protrusion 241 and the second groove 231. As a result, the risk of poor sealing between the conductive member 23 and the insulating member 24 can be reduced, and the reliability of the battery cell 20 can be improved.

[0099] In some embodiments, the insulating member 24 includes a bottom wall 242 and a peripheral wall 243. The bottom wall 242 is disposed between the first wall 213 and the conductive member 23, and the peripheral wall 243 surrounds the outer periphery of the conductive member 23. The peripheral wall 243 and the bottom wall 242 are connected. A second groove 231 is provided on one of the inner peripheral surface of the peripheral wall 243 and the outer peripheral surface of the conductive member 23, and a protrusion 241 is provided on the other.

[0100] The peripheral wall 243 and the bottom wall 242 are connected to form a receiving groove for accommodating the conductive component 23. The peripheral wall 243 and the bottom wall 242 can be integrally formed.

[0101] The inner circumferential surface of the peripheral wall 243 may be provided with a second groove 231, and the outer circumferential surface of the conductive element 23 may be provided with a protrusion 241. Alternatively, the inner circumferential surface of the peripheral wall 243 may be provided with a protrusion 241, and the outer circumferential surface of the conductive element 23 may be provided with a second groove 231.

[0102] A second groove 231 is provided on one of the inner peripheral surface of the insulating member 24 and the outer peripheral surface of the conductive member 23, and a protrusion 241 is provided on the other. When the conductive member 23 is assembled with the insulating member 24, the protrusion 241 can form a lateral engagement with the second groove 231, providing a continuous guiding effect, reducing the risk of misalignment of the conductive member 23, and further improving the reliability of the battery cell 20.

[0103] In some embodiments, the inner peripheral surface of the peripheral wall 243 is provided with a protrusion 241, and the outer peripheral surface of the conductive member 23 is provided with a second groove 231; one end of the second groove 231 extends to the back surface 23b of the conductive member 23.

[0104] The back surface 23b of the conductive element 23 faces the insulating element 24. One end of the second groove 231 extends to the back surface 23b of the conductive element 23, such that the second groove 231 has an opening facing the protrusion 241, allowing the protrusion 241 to enter the second groove 231.

[0105] The second groove 231 extends to the back surface 23b of the conductive member 23. When the conductive member 23 is assembled on the insulating member 24 with its front surface 23a facing away from the insulating member 24, that is, when the conductive member 23 is assembled on the insulating member 24 with its back surface 23b facing away from the insulating member 24, the protrusion 241 can be smoothly embedded in the second groove 231, thereby improving assembly efficiency.

[0106] In some embodiments, the other end of the second groove 231 is spaced apart from the front surface 23a of the conductive element 23.

[0107] The second groove 231 has one end near the back surface 23b and the other end away from the back surface 23b. The other end of the second groove 231 is spaced apart from the front surface 23a of the conductive element 23, that is, the other end of the second groove 231 does not extend to the front surface 23a.

[0108] The other end of the second groove 231 is spaced apart from the front surface 23a of the conductive member 23. When the first protrusion 241 is located in the middle position of the insulating member 24 along the length or width direction, it can also prevent the conductive member 23 from being installed backwards, which can also improve the reliability of the battery cell 20.

[0109] In some embodiments, one end of the first protrusion 241 is connected to the bottom wall 242, and the first protrusion 241 is located at the center of the peripheral wall 243 along the length of the insulating member 24. As an example, one end of the first protrusion 241 is connected to the bottom wall 242, and the other end may have a gap between it and the top surface of the peripheral wall 243. The second groove 231 may be located at the center of the conductive member 23 along the length.

[0110] Therefore, there is no gap between the first protrusion 241 and the bottom wall 242, which reduces the leakage path, improves the sealing effect of the connection between the conductive component 23 and the insulating component 24, and facilitates the installation and positioning of the first protrusion 241 and the second groove 231, thereby improving installation efficiency.

[0111] In some embodiments, the second groove 231 is adapted to the protrusion 241.

[0112] The second groove 231 is adapted to the protrusion 241, which may be that the shape and / or size of the second groove 231 and the protrusion 241 are adapted. For example, the second groove 231 and the protrusion 241 are adapted in length, width and height.

[0113] By adapting the second groove 231 to the protrusion 241, the protrusion 241 can be smoothly embedded in the second groove 231, and the two fit more tightly, which can reduce the risk of the conductive component 23 shaking and shifting, improve the positioning accuracy of the conductive component 23 and the terminal post 25, thereby improving the connection reliability and thus improving the reliability of the battery cell 20.

[0114] In some embodiments, the second groove 231 and the protrusion 241 are in clearance fit.

[0115] The second groove 231 and the protrusion 241 are fitted with a gap, which allows the protrusion 241 to be smoothly inserted into the second groove 231 when the conductive component 23 is correctly assembled, so that the conductive component 23 can be assembled in place, reducing assembly resistance, and also reducing the risk of the operator mistakenly thinking that it is installed backwards.

[0116] In some embodiments, the gap between the second groove 231 and the protrusion 241 is less than or equal to 0.02 mm. The gap between the second groove 231 and the protrusion 241 may be, for example, 0.01 mm, 0.013 mm, 0.016 mm, 0.017 mm, 0.018 mm, 0.019 mm, 0.02 mm, etc.

[0117] By ensuring that the gap between the second groove 231 and the protrusion 241 is less than or equal to 0.02 mm, the protrusion 241 can be smoothly embedded into the second groove 231, allowing the conductive component 23 to be assembled in place. This also reduces the risk of the conductive component 23 shifting or displacing, further improving the reliability of the battery cell 20.

[0118] In some embodiments, the insulating member 24 is provided with a first through hole 244; the conductive member 23 is provided with a second through hole 232 corresponding to the first through hole 244, the second through hole 232 penetrating the bottom wall of the first groove 233; the pole post 25 passes through the first through hole 244 and the second through hole 232 and is riveted to the conductive member 23.

[0119] The electrode post 25 is riveted to the conductive element 23, and a part of the electrode post 25 is embedded in the first groove 233 to improve the reliability of the connection.

[0120] In some embodiments, the housing 21 includes a housing 211 and an end cap 212. The housing 211 has a storage space for accommodating the electrode assembly 22, and the end cap 212 covers the opening of the housing 211. The end cap 212 is a first wall 213.

[0121] This application provides a battery device 100, including a battery cell 20 of any of the above embodiments, the battery cell 20 being used to provide electrical energy.

[0122] This application provides an electrical device, including a battery cell 20 or a battery device 100 as described in any of the above embodiments, wherein the battery device 100 is used to provide electrical energy.

[0123] Below, refer to Figures 3 to 9 Here is a specific example illustrating this application.

[0124] This application provides a battery cell 20, including a casing 21, an electrode assembly 22, a conductive element 23, an insulating element 24, and a terminal post 25. The casing 21 has a first wall 213, on which the conductive element 23, the insulating element 24, and the terminal post 25 are disposed. The first wall 213 may also be provided with a pressure relief mechanism 27, a sealing element for sealing the filling hole, etc.

[0125] The outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has a storage space for accommodating the electrode assembly 22, and the end cap 212 covers the opening of the housing 211. The first wall 213 is the end cap 212.

[0126] The conductive element 23 is disposed on the side of the first wall 213 facing away from the electrode assembly 22. The insulating element 24 includes a bottom wall 242 and a peripheral wall 243. The bottom wall 242 is disposed between the first wall 213 and the conductive element 23, and the peripheral wall 243 surrounds the outer periphery of the conductive element 23. The peripheral wall 243 and the bottom wall 242 are connected.

[0127] The bottom wall 242 is provided with a first through hole 244; the conductive component 23 is provided with a second through hole 232 corresponding to the first through hole 244, the front side 23a of the conductive component 23 is provided with a first groove 233, and the second through hole 232 penetrates the bottom wall of the first groove 233.

[0128] One end of the electrode post 25 passes through the first wall 213, the first through hole 244, and the second through hole 232 and is riveted to the electrode post 25. The other end is connected to the positive electrode tab of the electrode assembly 22. An insulating rubber ring 26 is provided between the electrode post 25 and the first wall 213.

[0129] The insulating member 24 has a protrusion 241 on its inner circumferential surface of its peripheral wall 243, and the conductive member 23 has a second groove 231 on its outer circumferential surface. One end of the second groove 231 extends to the back surface 23b of the conductive member 23, and the other end of the second groove 231 is spaced apart from the front surface 23a of the conductive member 23. The first protrusion 241 is located at the middle position along the length of the insulating member 24, and the second groove 231 is located at the middle position along the length of the conductive member 23. The second groove 231 and the protrusion 241 can be approximately equal in length, width, and height. The second groove 231 and the protrusion 241 are clearance-fitted, and the gap between the second groove 231 and the protrusion 241 is less than or equal to 0.02 mm.

[0130] When the conductive element 23 is assembled on the insulating element 24 with its front 23a facing away from the insulating element 24, the protrusion 241 is embedded in the second groove 231; when the conductive element 23 is assembled on the insulating element 24 with its front 23a facing the insulating element 24, the protrusion 241 interferes with the conductive element 23, or the protrusion interferes with the insulating element 24.

[0131] The precise fit between the second groove 231 and the protrusion 241 ensures the correct assembly of the conductive component 23 (positive electrode riveting block) and the insulating component 24 (plastic on the positive electrode), effectively solving the problem of reverse assembly. The design of the second groove 231 and the protrusion 241 not only increases the guidance of the assembly but also improves the accuracy. During assembly, the protrusion 241 aligns smoothly with the second groove 231, eliminating the possibility of human error. This structural design simplifies the assembly process, improves production efficiency, and reduces rework and scrap rates caused by incorrect assembly. Furthermore, the protrusion 241 embedded in the second groove 231 reduces the risk of movement of the conductive component 23 relative to the insulating component 24, enhancing the mechanical connection strength between the conductive component 23 and the insulating component 24, further improving the airtight reliability of the battery cell. In practical applications, this design effectively prevents poor airtightness at the riveting position due to assembly errors, ensuring that the battery cell 20 maintains good performance and safety under various operating conditions. This structural design not only improves product quality and reliability but also reduces production costs and enhances the controllability and consistency of the production process. This is particularly important for the mass production and high-quality manufacturing of battery cells.

[0132] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell, including the first wall; Electrode assembly, disposed within the housing; A conductive element is disposed on the side of the first wall opposite to the electrode assembly, and a first groove is provided on the front side of the conductive element. An insulating element is at least partially disposed between the conductive element and the first wall; A pole penetrating the first wall and the insulating element, the pole being electrically connected to the electrode assembly and the conductive element; One of the insulating component and the conductive component is provided with a second groove, and the other is provided with a protrusion; When the conductive component is assembled on the insulating component with its front facing away from the insulating component, the protrusion is embedded in the second groove; when the conductive component is assembled on the insulating component with its front facing the insulating component, the protrusion interferes with the conductive component, or the protrusion interferes with the insulating component.

2. The battery cell according to claim 1, characterized in that, The insulating component includes a bottom wall and a peripheral wall. The bottom wall is disposed between the first wall and the conductive component, and the peripheral wall surrounds the outer periphery of the conductive component. The peripheral wall and the bottom wall are connected. The inner circumferential surface of the peripheral wall and the outer circumferential surface of the conductive element are provided with a second groove, and the other is provided with a protrusion.

3. The battery cell according to claim 2, characterized in that, The inner circumferential surface of the peripheral wall is provided with a protrusion, and the outer circumferential surface of the conductive component is provided with a second groove; One end of the second groove extends to the back of the conductive element.

4. The battery cell according to claim 3, characterized in that, The other end of the second groove is spaced apart from the front side of the conductive element.

5. The battery cell according to claim 3, characterized in that, One end of the protrusion is connected to the bottom wall; Along the length of the insulating element, the protrusion is located at the center of the peripheral wall; Along the length of the conductive element, the second groove is located at the center of the conductive element.

6. The battery cell according to claim 1, characterized in that, The second groove is adapted to the protrusion.

7. The battery cell according to claim 1, characterized in that, The second groove and the protrusion are in clearance fit.

8. The battery cell according to claim 7, characterized in that, The gap between the second groove and the protrusion is less than or equal to 0.02 mm.

9. The battery cell according to claim 1, characterized in that, The insulating component is provided with a first through hole; The conductive component is provided with a second through hole corresponding to the first through hole, and the second through hole penetrates the bottom wall of the first groove; The pole passes through the first through hole and the second through hole and is riveted to the conductive element.

10. The battery cell according to claim 1, characterized in that, The electrode assembly includes a positive electrode tab; The electrode post is connected to the positive electrode tab.

11. The battery cell according to claim 1, characterized in that, The housing includes a shell and an end cap. The shell has a storage space for accommodating the electrode assembly. The end cap covers the opening of the shell and is the first wall.

12. A battery device, characterized in that, include: The battery cell as described in any one of claims 1-11.

13. An electrical appliance, characterized in that, include: The battery cell as described in any one of claims 1-11 or the battery device as described in claim 12.

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