Battery monomer, battery device and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises: a housing having a first surface and having an accommodating space inside; the pressure relief structure is arranged on the first surface; the two electrode terminals are arranged on the first face and located on the two opposite sides of the pressure relief structure, one ends of the two electrode terminals penetrate through the first face and extend into the containing space, and the two electrode terminals are arranged adjacent to the pressure relief structure; according to the battery monomer provided by the embodiment of the invention, the two electrode terminals are arranged adjacent to the pressure relief structure, so that the distance between the two electrode terminals is shortened, and the size of the first surface at the pressure relief structure is shortened; under the condition that the battery monomer is collided and limited by the two electrode terminals, the deformation quantity of the part, around the pressure relief structure, of the shell can be reduced through the arrangement, so that possible damage to the pressure relief structure is reduced, the stability and the safety performance of the pressure relief structure are improved, and the stability and the safety performance of the battery monomer are improved.

Description

Technical Field

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

[0002] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0003] In current battery devices, impacts to the bottom of individual battery cells can easily cause deformation and damage to the pressure relief structure, which can reduce the stability of the pressure relief structure and lead to its failure. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can alleviate the problem that the current pressure relief structure is easily damaged and deformed when the bottom of the battery cell is subjected to impact.

[0005] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0006] The housing has a first surface and an internal receiving space; a pressure relief structure is disposed on the first surface, at least a portion of which passes through the housing and communicates with the receiving space; two electrode terminals are disposed on the first surface and located on opposite sides of the pressure relief structure, one end of each electrode terminal passes through the first surface and extends into the receiving space, and the two electrode terminals are disposed adjacent to the pressure relief structure.

[0007] In this embodiment, the two electrode terminals are positioned close to the pressure relief structure to shorten the distance between the two electrode terminals and reduce the size of the first surface at the pressure relief structure. In the event of a collision with the battery cell, the two electrode terminals limit the deformation of the portion of the casing around the pressure relief structure, thereby reducing potential damage to the pressure relief structure, improving the stability and safety performance of the pressure relief structure, and also improving the stability and safety performance of the battery cell.

[0008] In some embodiments, the battery cell further includes a connection structure, a pressure relief structure and two electrode terminals are all connected to the connection structure, and the connection structure is connected to the first surface.

[0009] In this embodiment, a connecting structure is provided, and the pressure relief structure and two electrode terminals are both located on the connecting structure. The connecting structure can strengthen the outer shell around the pressure relief structure, and the two electrode terminals can also share some of the collision energy when the battery cell is impacted, thereby reducing the collision energy borne by the connecting structure. When the battery cell is impacted, this arrangement can reduce the deformation of the connecting structure and the deformation of the outer shell around the pressure relief structure, thereby better protecting the pressure relief structure.

[0010] In some embodiments, the connection structure includes a connector connected to the first surface; the connector is disposed around the pressure relief structure and two electrode terminals and forms an inner space, wherein portions of the two electrode terminals and portions of the pressure relief structure are accommodated in the inner space.

[0011] In this embodiment, the connecting structure includes a connector, and the connector is connected to the first surface, so that the connecting structure can be connected to the first surface through the connector; the connector is a structure surrounding the electrode terminal and the pressure relief structure, so that the connector can be more stably connected to the first surface, and the connector can also provide support for the shell around the pressure relief structure, so as to better improve the strength of the part of the shell around the pressure relief structure and reduce the deformation of the part of the shell around the pressure relief structure.

[0012] In some embodiments, the connection structure further includes a reinforcing member connected to the connector, the reinforcing member dividing the inner space into at least two subspaces, each electrode terminal corresponding to at least one subspace, and at least a portion of the electrode terminal being accommodated in the corresponding subspace.

[0013] The technical solution of this embodiment further provides some specific structures for the connection structure, such that the connection structure includes a reinforcing member, so as to improve the strength of the connection structure through the reinforcing member, thereby better improving the strength of the part of the shell around the pressure relief structure and reducing the deformation of the part of the shell around the pressure relief structure.

[0014] In some embodiments, the pressure relief structure is connected to the reinforcement.

[0015] In the technical solution of this embodiment, the pressure relief structure is set on the reinforcing member so that the reinforcing member can directly protect the pressure relief structure. This allows both the reinforcing member and the connecting member to provide support for the outer shell around the pressure relief structure, thereby improving the strength of the portion of the outer shell around the pressure relief structure and reducing the deformation of the portion of the outer shell around the pressure relief structure.

[0016] In some embodiments, the connector is a metal structural component that is welded to the housing.

[0017] In this embodiment, the connector is welded to the outer shell so that the connector can be connected to the outer shell more stably, thereby improving the strength of the outer shell around the pressure relief structure.

[0018] In some embodiments, the connection structure further includes a fixing member connected to the side of the connector away from the housing, and the pressure relief structure and the two electrode terminals are both connected to the fixing member.

[0019] The technical solution of this embodiment further provides some specific structures for the connection structure, such that the connection structure includes a fixing member to fix the pressure relief structure and the two electrode terminals, so that the pressure relief structure and the two electrode terminals can be more stably connected to the connection structure.

[0020] In some embodiments, the fastener is an injection-molded structural component.

[0021] In the technical solution of this embodiment, the fixing component is an injection-molded structural component, so that the fixing component can not only fix the electrode terminals and the pressure relief structure, but also reduce the weight of the connection structure and provide a certain insulation effect.

[0022] In some embodiments, the pressure relief structure includes a first diaphragm, which is opposite to the interior of the housing, and is used to rupture when the pressure inside the containment space exceeds a preset threshold; the first diaphragm is connected to the connecting structure.

[0023] The technical solution of this embodiment provides some specific structures for pressure relief structures, so that the pressure relief structure can release the pressure inside the casing when the pressure inside the casing exceeds a preset threshold, thereby improving the safety performance of the battery cell.

[0024] In some embodiments, the connecting structure is provided with a weak structure, which serves as a first diaphragm.

[0025] In the technical solution of this embodiment, the first diaphragm is made part of the connecting structure, which reduces the number of components and reduces the assembly difficulty.

[0026] In some embodiments, the pressure relief structure further includes a second diaphragm connected to the connection structure, the second diaphragm being disposed on the side of the first diaphragm away from the housing, and the second diaphragm covering the first diaphragm.

[0027] The technical solution of this embodiment further provides some specific structures for the pressure relief structure, which includes setting a second diaphragm and covering the first diaphragm to protect the first diaphragm, reduce the damage that the external environment may cause to the first diaphragm, and improve the stability of the pressure relief structure.

[0028] In some embodiments, the two electrode terminals are arranged along a first direction, and the minimum dimension of the pressure relief structure is in the first direction.

[0029] In the technical solution of this embodiment, the minimum size of the pressure relief structure is made in the first direction so that the distance between the two electrode terminals can be further reduced, thereby further reducing the deformation of the portion of the housing around the pressure relief structure.

[0030] In some embodiments, the center-to-center distance between the two electrode terminals ranges from 20 mm to 60 mm.

[0031] The technical solution of this embodiment provides a range of center-to-center spacing between some electrode terminals to reduce the deformation of the portion of the housing around the pressure relief structure, improve the stability of the pressure relief structure, and reduce the risk of failure of the pressure relief structure after being subjected to impact.

[0032] In some embodiments, the electrode terminals are cylindrical or prismatic structures.

[0033] The technical solution of this embodiment provides some electrode terminal structures, making the electrode terminals cylindrical to reduce the risk of stress concentration on the electrode terminals and improve the strength of the electrode terminals; making the electrode terminals prismatic to increase the connection area between the electrode terminals and external electrical connection structures (such as electrodes), and to improve the current-carrying area and current-carrying capacity of the electrode terminals.

[0034] In some embodiments, at least one side of the electrode terminal is an arc surface, which is part of a cylindrical surface, and the axis of the arc surface is perpendicular to the first surface.

[0035] In the technical solution of this embodiment, at least one side of the electrode terminal is an arc surface to reduce the number of edges on the side of the electrode terminal. This setting can reduce stress concentration of the electrode terminal and also enable the electrode terminal to have a larger current flow area.

[0036] In some embodiments, the housing includes a housing and an end cap connected to the housing, a receiving space is formed within the housing, and the housing has an opening; the end cap closes to the opening, and a first surface of the end cap is the surface of the end cap facing away from the receiving space.

[0037] The technical solution of this embodiment provides some specific structures of the housing so that the housing can provide a mounting base for the electrode terminals and the pressure relief structure.

[0038] In some embodiments, a mounting groove is provided on the first surface, and at least part of the connecting structure is accommodated in the mounting groove; the first surface is provided with a first through hole and two second through holes located in the mounting groove, the first through hole corresponds to the pressure relief structure, and the two second through holes correspond to two electrode terminals respectively.

[0039] In the technical solution of this embodiment, an installation groove is provided on the first surface to accommodate at least a portion of the connecting structure. The connecting structure can be connected to both the bottom surface of the installation groove and the inner sidewall of the installation groove. That is, this arrangement can also increase the connection area between the installation groove and the connecting structure, thereby improving the connection stability of the connecting structure.

[0040] In some embodiments, the mounting groove is provided with a reinforcing structure that connects to the end cap.

[0041] In the technical solution of this embodiment, a reinforcing structure is provided in the mounting groove to further improve the strength of the part of the end cover around the pressure relief structure, thereby further reducing the deformation of the part of the outer shell around the pressure relief structure, improving the stability of the pressure relief structure, and reducing the risk of failure of the pressure relief structure after being impacted.

[0042] Secondly, embodiments of this application also provide a battery device, including the battery cell provided in some embodiments of the first aspect.

[0043] Thirdly, embodiments of this application also provide an electrical device, including the battery device provided in some embodiments of the second aspect.

[0044] 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, the following are specific embodiments of this application. Attached Figure Description

[0045] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0046] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0047] Figure 2 This is an exploded view of the battery device provided in some embodiments of this application;

[0048] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0049] Figure 4 A three-dimensional schematic diagram of a battery cell provided in some embodiments of this application;

[0050] Figure 5A perspective view of the connection structure provided in some embodiments of this application;

[0051] Figure 6 This is an exploded view of the connection structure provided in some embodiments of this application;

[0052] Figure 7 This is an exploded view of the connection structure provided in some other embodiments of this application;

[0053] Figure 8 A perspective view of the connectors provided in some embodiments of this application;

[0054] Figure 9 This is a perspective view of the connection structure provided in some other embodiments of this application;

[0055] Figure 10 A top view schematic diagram of a battery cell provided in some embodiments of this application;

[0056] Figure 11 This is a top view of an end cap provided in some embodiments of this application;

[0057] Figure 12 This is a partial cross-sectional schematic diagram of an end cap provided for some embodiments of this application.

[0058] The markings in the diagram mean:

[0059] 1000, vehicles;

[0060] 100. Battery device;

[0061] 10. Box; 11. First box; 12. Second box;

[0062] 20. Battery cell; 21. Housing; 211. End cap; 2111. First surface; 2112. Mounting groove; 2113. First through hole; 2114. Second through hole; 2115. Reinforcing structure; 212. Housing; 2121. Receiving space; 22. Electrode assembly; 23. Electrode terminal; 231. Arc surface; 24. Pressure relief structure; 241. First diaphragm; 242. Second diaphragm; 25. Connecting structure; 251. Connector; 2511. Internal space; 25111. Subspace; 252. Reinforcing member; 253. Fixing member;

[0063] 200. Motor;

[0064] 300. Controller. Detailed Implementation

[0065] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0067] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0068] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0069] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0070] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0071] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0072] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0073] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0074] When a battery pack is subjected to an impact, especially at the bottom or top, the impact energy is easily conducted to each individual battery cell, and further to the electrode terminals and the walls containing the pressure relief structures within those cells. In current battery cells, the distance between the two electrode terminals is typically quite large. When impact energy is conducted to the battery cells, the walls containing the pressure relief structures are prone to significant deformation, which can easily lead to the failure and damage of the pressure relief structures.

[0075] Based on the above considerations, in order to alleviate the problem that the current pressure relief structure is easily damaged and deformed when the bottom of the battery cell is impacted, this application provides a battery cell in which both electrode terminals are arranged adjacent to the pressure relief structure to shorten the distance between the two electrode terminals. In such a battery cell, the distance between the two electrode terminals is small, and the size of the portion of the casing around the pressure relief structure is also small. When the battery cell is impacted, the deformation of the portion of the casing around the pressure relief structure can be reduced due to the limitation of the two electrode terminals, thereby reducing the possible damage to the pressure relief structure, improving the stability and safety performance of the pressure relief structure, and improving the stability and safety performance of the battery cell.

[0076] The battery device disclosed in this application can be used in electrical devices that use the battery device as a power source or in various energy storage systems that use the battery device as an energy storage element. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0077] 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.

[0078] refer to Figure 1 , Figure 1 This 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. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery is installed inside the vehicle 1000, and the battery can be located at the bottom, front, or rear of the vehicle 1000. The battery can be used to power the vehicle 1000; for example, the battery can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 200. The controller 300 is used to control the battery to supply power to the motor 200, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0079] In some embodiments of this application, the battery 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.

[0080] refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application.

[0081] The battery device 100 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 20, which are connected in series, parallel, or mixed connections via busbars.

[0082] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0083] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together. As an example, a battery module can also be formed by bundling multiple battery cells 20 together with cable ties.

[0084] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more individual battery cells housed within the housing 10.

[0085] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0086] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0087] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be an end cap 211 or a base plate.

[0088] As an example, the housing 10 may include an end cap 211, a frame, and a base plate. The end cap 211 and the base plate are respectively connected to the frame, so that the interior of the housing 10 forms a closed space to accommodate the battery cell assembly.

[0089] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0090] refer to Figure 3 , Figure 3This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. A battery cell 20 refers to the smallest unit that makes up a battery. The battery cell 20 can be a rechargeable battery, meaning that after the battery cell 20 has been discharged, its active materials can be activated by charging and it can continue to be used.

[0091] The battery cell 20 can be a 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., and the embodiments of this application are not limited to this.

[0092] As shown in the figure, the battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. The housing 21 includes a shell 212 and an end cap 211.

[0093] End cap 211 refers to a component that covers the opening of housing 212 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 211 can be adapted to the shape of housing 212 to fit it. Optionally, end cap 211 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 211 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 23 can be provided on end cap 211. Electrode terminals 23 can be used for electrical connection with electrode assembly 22 for outputting or inputting electrical energy to battery cell 20. In some embodiments, end cap 211 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 211. The insulating element can be used to isolate the electrical connection components within the housing 212 from the end cap 211 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0094] The housing 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 212 and the end cap 211 can be independent components. An opening can be provided on the housing 212, and the end cap 211 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 211 and the housing 212 can be integrated. Specifically, the end cap 211 and the housing 212 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 212, the end cap 211 closes the housing 212. The housing 212 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0095] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The casing 212 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 22, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals 23 to form a current loop.

[0096] Firstly, reference Figure 4 This application provides a battery cell 20, including a housing 21, a pressure relief structure 24, and electrode terminals 23. The housing 21 has a first surface 2111 and an internal accommodating space 2121. The pressure relief structure 24 is disposed on the first surface 2111, with at least a portion passing through the housing 21 and communicating with the accommodating space 2121. Two electrode terminals 23 are disposed on the first surface 2111 and located on opposite sides of the pressure relief structure 24, with one end of each electrode terminal 23 passing through the first surface 2111 and extending into the accommodating space 2121. The two electrode terminals 23 are disposed adjacent to the pressure relief structure 24.

[0097] In the figure, the X-axis is the length direction of the battery cell 20, the Y-axis is the width direction of the battery cell 20, and the Z-axis is the height direction of the battery cell 20.

[0098] The outer casing 21 refers to the component used to form the internal environment of the battery cell 20. The outer casing 21 can be cylindrical, prismatic or other shapes. The material of the outer casing 21 can be metal, plastic or other materials. The outer casing 21 has a first surface 2111, which is a surface of the outer casing 21 facing the external environment. Depending on the shape of the outer casing 21, the first surface 2111 can be circular, square or other shapes.

[0099] The containment space 2121 refers to the spatial structure formed inside the outer shell 21, in which the electrode assembly 22, electrolyte or other structures can be contained. The containment space 2121 can be a cylindrical spatial structure, a prism-shaped spatial structure or other spatial structures, and the shape of the containment space 2121 can also be set according to the shape of the outer shell 21.

[0100] The pressure relief structure 24 refers to the structure in the battery cell 20 used to release the pressure in the containment space 2121. When the pressure in the containment space 2121 is greater than the preset threshold of the pressure relief structure 24, the pressure relief structure 24 can open and release the pressure in the containment space 2121 to the external environment. The pressure relief structure 24 may include an explosion-proof valve, an explosion-proof plate or other structures. The pressure relief structure 24 is provided on the first surface 2111 and can be connected to the first surface 2111 of the outer casing 21 by welding, bonding, snap-fitting or other means.

[0101] At least a portion of the pressure relief structure 24 can pass through the outer casing 21, that is, at least a portion of the pressure relief structure 24 can pass through the outer casing 21 from the first side 2111. At least a portion of the pressure relief structure 24 can communicate with the receiving space 2121 so that the pressure in the receiving space 2121 can be discharged to the outside of the battery cell 20 through the pressure relief structure 24.

[0102] Electrode terminal 23 refers to the structure in battery cell 20 used for inputting and outputting electrical energy. Electrode terminal 23 can be connected to electrode assembly 22 to input or output electrical energy to electrode assembly 22. The shape of electrode terminal 23 can be cylindrical, prismatic, or other shapes.

[0103] Electrode terminals 23 are disposed on the first surface 2111, that is, electrode terminals 23 are disposed on the first surface 2111 of the housing 21; electrode terminals 23 can be connected to the housing 21 by welding, bonding, snapping or other means; one end of electrode terminals 23 passes through the first surface 2111 and extends into the receiving space 2121, that is, electrode terminals 23 can pass through the first surface 2111 of the housing 21 and enter the receiving space 2121, so that electrode terminals 23 can be connected to electrode assembly 22.

[0104] The electrode terminal 23 is located near the pressure relief structure 24, meaning that the distance between the electrode terminal 23 and the pressure relief structure 24 is relatively close. Since the two electrode terminals 23 are located on opposite sides of the pressure relief structure 24, the distance between the two electrode terminals 23 is correspondingly reduced when the electrode terminal 23 is near the pressure relief structure 24.

[0105] Since the pressure relief structure 24 is located between the two electrode terminals 23, and the electrode terminals 23 can provide support for the portion of the housing 21 around the pressure relief structure 24, that is, the electrode terminals 23 can withstand the supplementary collision energy and external force to suppress the deformation of the portion of the housing 21 around the pressure relief structure 24. Therefore, the distance between the two electrode terminals 23 is positively correlated with the deformation of the portion of the housing 21 around the pressure relief structure 24. Reducing the distance between the two electrode terminals 23 can reduce the deformation of the portion of the housing 21 around the pressure relief structure 24.

[0106] In this embodiment, the two electrode terminals 23 are arranged adjacent to the pressure relief structure 24 to shorten the distance between the two electrode terminals 23 and shorten the size of the first surface 2111 at the pressure relief structure 24. In the event of a collision with the battery cell 20, the two electrode terminals 23 limit the deformation of the portion of the casing 21 around the pressure relief structure 24, thereby reducing the potential damage to the pressure relief structure 24, improving the stability and safety performance of the pressure relief structure 24, and also improving the stability and safety performance of the battery cell 20.

[0107] refer to Figure 4 , Figure 5 In some embodiments, the battery cell 20 further includes a connection structure 25, a pressure relief structure 24 and two electrode terminals 23, all of which are connected to the connection structure 25, and the connection structure 25 is connected to the first surface 2111.

[0108] The connecting structure 25 refers to the structure in the battery cell 20 used to fix the pressure relief structure 24 and the two electrode terminals 23. Both the pressure relief structure 24 and the electrode terminals 23 are connected to the connecting structure 25 and connected to the outer casing 21 through the connecting structure 25. The electrode terminals 23 can be connected to the connecting structure 25 by welding, snap-fitting, bonding or other means. The pressure relief structure 24 can also be connected to the connecting structure 25 by welding, bonding or other means. The connecting structure 25 can be a sheet, block, frame structure or other structure. The connecting structure 25 can be connected to the outer casing 21 by welding, bonding, snap-fitting or other means.

[0109] Since both electrode terminals 23 and pressure relief structure 24 are connected to the connecting structure 25, that is, both electrode terminals 23 and pressure relief structure 24 can be integrated on the connecting structure 25, the distance between the two electrode terminals 23 can be small, so that the electrode terminals 23 can suppress the deformation of the outer casing 21 around the pressure relief structure 24, thereby improving the stability of the pressure relief structure 24 when the battery cell 20 is impacted, and reducing the risk of failure of the pressure relief structure 24.

[0110] Since both electrode terminal 23 and pressure relief structure 24 are connected to connection structure 25, and connection structure 25 is connected to the first surface 2111 of housing 21, connection structure 25 can both enhance the strength of pressure relief structure 24 and improve the strength of housing 21 around pressure relief structure 24, thereby suppressing the deformation of housing 21 around pressure relief structure 24.

[0111] Since both electrode terminal 23 and pressure relief structure 24 are connected to the connecting structure 25, during the installation of electrode terminal 23 and pressure relief structure 24, it is only necessary to install the connecting structure 25 on the first surface 2111 of the housing 21. Compared with the method of installing pressure relief structure 24 and two electrode terminals 23 separately, this setting can simplify the installation process and improve production efficiency.

[0112] In this embodiment, a connecting structure 25 is provided, and the pressure relief structure 24 and two electrode terminals 23 are both disposed on the connecting structure 25. The connecting structure 25 can strengthen the outer shell 21 around the pressure relief structure 24. At the same time, the two electrode terminals 23 can also share part of the collision energy when the battery cell 20 is impacted, thereby reducing the collision energy borne by the connecting structure 25. When the battery cell 20 is impacted, this arrangement can reduce the deformation of the connecting structure 25 and reduce the deformation of the outer shell 21 around the pressure relief structure 24, thereby better protecting the pressure relief structure 24.

[0113] refer to Figures 4 to 8 In some embodiments, the connection structure 25 includes a connector 251 connected to the first surface 2111; the connector 251 is arranged around the pressure relief structure 24 and the two electrode terminals 23 and forms an inner space 2511, and portions of the two electrode terminals 23 and portions of the pressure relief structure 24 are both accommodated in the inner space 2511.

[0114] Connector 251 refers to the part of the connecting structure 25 used to connect with the outer shell 21. Connector 251 can be an independent structural component, such as a strip structure, a ring structure, or other shaped structures. Connector 251 can also be a structure formed during the process of connecting the connecting structure 25 to the outer shell 21, such as a strip structure formed by welding and solder, or a structure formed by adhesive after bonding. Depending on the structure of connector 251, the number of connectors 251 can be one, two, or more. Connector 251 can be connected to the outer shell 21 by welding, bonding, or other methods. The material of connector 251 can include metal, plastic, or other materials.

[0115] The connection structure 25 may include a connector 251, or other structures besides the connector 251. The electrode terminal 23 and the pressure relief structure 24 may be connected to the connector 251 or other structures of the connection structure 25.

[0116] When the connector 251 is connected to the housing 21, part of the collision energy transmitted to the housing 21 can also be transmitted to the connector 251. At this time, the connector 251 can also share part of the collision energy on the housing 21 and can increase the strength of the housing 21 on the first surface 2111, thereby suppressing the deformation of part of the structure of the housing 21 around the pressure relief structure 24, thus playing the role of protecting the pressure relief structure 24.

[0117] The connector 251 is arranged around the pressure relief structure 24 and the two electrode terminals 23. That is, at least a part of the connector 251 is a ring structure to surround the pressure relief structure 24 and the two electrode terminals 23. The connector 251 can be a square ring structure, a racetrack ring structure or other ring structure.

[0118] The connector 251 can form an inner space 2511 to accommodate the electrode terminal 23 and the pressure relief structure 24. Depending on the shape of the connector 251, the inner space 2511 can be circular, square, racetrack-shaped or other shapes. Since the electrode terminal 23 passes through the housing 21 and extends into the accommodating space 2121, and the pressure relief structure 24 also passes through the housing 21 and communicates with the accommodating space 2121, the electrode terminal 23 and the pressure relief structure 24 can be located only partially in the inner space 2511.

[0119] The connector 251 surrounds the pressure relief structure 24 and the electrode terminal 23 and forms a ring structure. When the battery cell 20 is impacted, the connector 251 can distribute the impact energy borne by the first surface 2111 of the outer shell 21 from all directions, thereby better suppressing the deformation of the outer shell 21 at the connector 25 and reducing the risk of damage to the pressure relief structure 24.

[0120] Since the connecting structure 25 is mainly connected to the housing 21 through the connector 251, the connector 251 surrounds the pressure relief structure 24 and the two electrode terminals 23, so that the periphery of the connecting structure 25 can be connected to the housing 21, which improves the stability of the connecting structure 25 connected to the housing 21, and also improves the stability of the electrode terminals 23 and the pressure relief structure 24 connected to the housing 21.

[0121] In this embodiment, the connecting structure 25 includes a connector 251, and the connector 251 is connected to the first surface 2111, so that the connecting structure 25 can be connected to the first surface 2111 through the connector 251; the connector 251 is a structure surrounding the electrode terminal 23 and the pressure relief structure 24, so that the connector 251 can be more stably connected to the first surface 2111, and the connector 251 can also provide support for the outer shell 21 around the pressure relief structure 24, so as to better improve the strength of the portion of the outer shell 21 around the pressure relief structure 24 and reduce the deformation of the portion of the outer shell 21 around the pressure relief structure 24.

[0122] refer to Figures 5 to 8 In some embodiments, the connection structure 25 further includes a reinforcing member 252 connected to the connector 251, the reinforcing member 252 dividing the inner space 2511 into at least two subspaces 25111, each electrode terminal 23 corresponding to at least one subspace 25111, and at least a portion of the electrode terminal 23 being accommodated in the corresponding subspace 25111.

[0123] The reinforcing member 252 refers to the structure on the connecting structure 25 used to improve strength. The reinforcing member 252 is connected to the connecting member 251 to improve the strength of the connecting member 251. The reinforcing member 252 can be a thin plate structure, a block structure, a strip structure, or a structure of other shapes. The reinforcing member 252 can be circular, square, or other shapes. The number of reinforcing members 252 can be one, two, or more. The reinforcing member 252 can be connected to the connecting member 251 by welding, bonding, snapping, or other means. The reinforcing member 252 can also be integrally formed with the connecting member 251. The material of the reinforcing member 252 can be the same as or different from the material of the connecting member 251. The material of the reinforcing member 252 can include metal, plastic, or other materials.

[0124] Subspace 25111 refers to a portion of the spatial structure within inner space 2511. Subspace 25111 is formed by reinforcing members 252 separating inner space 2511. Depending on the number and structure of reinforcing members 252, the number of subspaces 25111 can be two, three, or more. Subspace 25111 can be a prism-shaped space, a cylindrical space, or other shaped spatial structure. Each electrode terminal 23 corresponds to at least one subspace 25111, and at least a portion of the electrode terminal 23 is accommodated in the corresponding subspace 25111.

[0125] Depending on the number of subspaces 25111 and the structure of the reinforcing member 252, the pressure relief structure 24 can be accommodated in the subspace 25111 and connected to the connecting member 251 and the reinforcing member 252. The pressure relief structure 24 can also be connected to the reinforcing member 252 and indirectly connected to the connecting member 251 through the reinforcing member 252.

[0126] The reinforcement 252 improves the strength of the connector 251 and the overall strength of the connection structure 25. In the event of a collision with the battery cell 20, the connection structure 25 can better suppress the deformation of the outer shell 21 at the connection structure 25 under the action of the reinforcement 252, reducing the risk of damage to the pressure relief structure 24.

[0127] This embodiment further provides some specific structures of the connection structure 25, such that the connection structure 25 includes a reinforcing member 252, so as to improve the strength of the connection structure 25 through the reinforcing member 252, so as to better improve the strength of the portion of the outer shell 21 around the pressure relief structure 24 and reduce the deformation of the portion of the outer shell 21 around the pressure relief structure 24.

[0128] refer to Figures 5 to 7 In some embodiments, the pressure relief structure 24 is connected to the reinforcement 252.

[0129] The pressure relief structure 24 is connected to the reinforcing member 252. The pressure relief structure 24 can be connected to the reinforcing member 252 by welding, bonding or other means. The pressure relief structure 24 can be mostly connected to the reinforcing member 252, or only one side or two sides of the pressure relief structure 24 can be connected to the reinforcing member 252.

[0130] When the pressure relief structure 24 is connected to the reinforcement 252, a portion of the pressure relief structure 24 should be able to pass through the reinforcement 252 or through the housing 21 so that the pressure relief structure 24 can communicate with the receiving space 2121 and release the pressure in the receiving space 2121.

[0131] In this embodiment, the pressure relief structure 24 is disposed on the reinforcing member 252 so that the reinforcing member 252 directly provides protection for the pressure relief structure 24, so that both the reinforcing member 252 and the connecting member 251 can provide support for the outer shell 21 around the pressure relief structure 24, thereby improving the strength of the portion of the outer shell 21 around the pressure relief structure 24 and reducing the deformation of the portion of the outer shell 21 around the pressure relief structure 24.

[0132] In some embodiments, the connector 251 is a metal structural component, and the connector 251 is welded to the housing 21.

[0133] The connector 251 is a metal structural component, meaning that the material of the connector 251 includes at least metal. For example, the material of the connector 251 may include one or more of iron, aluminum, and copper. The connector 251 may also include other metal materials. The connector 251 is welded to the housing 21. The connector 251 may be welded to the housing 21 by laser welding, ultrasonic welding, or other methods.

[0134] In this embodiment, the connector 251 is welded to the outer shell 21 so that the connector 251 can be connected to the outer shell 21 more stably, so that the connector 251 can better improve the strength of the portion of the outer shell 21 around the pressure relief structure 24.

[0135] refer to Figures 5 to 7 In some embodiments, the connection structure 25 further includes a fixing member 253, which is connected to the side of the connector 251 away from the housing 21. The pressure relief structure 24 and the two electrode terminals 23 are both connected to the fixing member 253.

[0136] The fastener 253 refers to the structure in the connecting structure 25 used to fix the electrode terminal 23 and the pressure relief structure 24. The fastener 253 can be a plate-shaped structure, a strip-shaped structure, or other structures. The shape of the fastener 253 can be circular, square, or other shapes. The shape of the fastener 253 can be the same as or different from that of the connector 251. The fastener 253 is connected to the side of the connector 251 away from the outer shell 21. The fastener 253 can be connected to the connector 251 by bonding, welding, or other means. The material of the fastener 253 can include metal, plastic, or other materials.

[0137] The number of fasteners 253 can be one, two or more; when there is only one fastener 253, the fastener 253 simultaneously fixes the pressure relief structure 24 and the two electrode terminals 23.

[0138] The pressure relief structure 24 and the two electrode terminals 23 are both connected to the fixing member 253, so as to stably fix the pressure relief structure 24 and the two electrode terminals 23 to the connecting structure 25 by the fixing member 253. For example, when the connecting member 251 encloses the inner space 2511, the fixing member 253 can cover the side of the connecting member 251 away from the outer shell 21, so as to press the electrode terminals 23 and the pressure relief structure 24 against the first surface 2111 of the outer shell 21 to achieve a fixing effect.

[0139] Since the pressure in the containment space 2121 needs to be released to the external environment through the pressure relief structure 24, that is, the pressure relief structure 24 should be able to communicate with the external environment, the pressure relief structure 24 can pass through the fixing member 253 and be exposed to the external environment so as to facilitate communication with the external environment; since the end of the electrode terminal 23 away from the containment space 2121 is used to connect to the external electrical connection structure 25 (e.g., bar plate), the electrode terminal 23 can pass through the fixing member 253 or be exposed to the external environment.

[0140] The fastener 253 not only securely fixes the pressure relief structure 24 and the electrode terminal 23 to the first surface 2111 of the housing 21, but also further improves the overall strength of the connection structure 25, thereby increasing the strength of the portion of the housing 21 around the pressure relief structure 24, reducing the deformation of the portion of the housing 21 around the pressure relief structure 24, and reducing the risk of damage to the pressure relief structure 24.

[0141] This embodiment further provides some specific structures for the connection structure 25, such that the connection structure 25 includes a fastener 253 to fix the pressure relief structure 24 and the two electrode terminals 23, so that the pressure relief structure 24 and the two electrode terminals 23 can be more stably connected to the connection structure 25; at the same time, this arrangement can also improve the strength of the portion of the housing 21 around the pressure relief structure 24, reduce the deformation of the portion of the housing 21 around the pressure relief structure 24, and reduce the risk of damage to the pressure relief structure 24.

[0142] In some embodiments, the fastener 253 is an injection-molded structural component.

[0143] Injection molded structural parts are structural parts formed through the injection molding process. The injection molding process is a processing method that involves injecting heated raw materials into a mold and solidifying them to form a product of a specific shape.

[0144] Making the fastener 253 an injection-molded structural part can improve the overall integrity of the fastener 253, thereby enabling the fastener 253 to have higher strength and also improve the processing accuracy of the fastener 253.

[0145] For example, during the processing of the fastener 253, the electrode terminal 23, the pressure relief structure 24, and the connector 251 can be fixed in the mold first, and the electrode terminal 23 and the pressure relief structure 24 can be fixed in the inner space 2511 of the connector 251. Then, the raw material is injected into the mold and cured. After the raw material is cured, the fastener 253 is formed. At this time, the injection-molded fastener 253 can better fix the electrode terminal 23 and the pressure relief structure 24.

[0146] For example, fastener 253 is a plastic structural component.

[0147] In this embodiment, the fixing member 253 is an injection-molded structural part, so that the fixing member 253 can not only fix the electrode terminal 23 and the pressure relief structure 24, but also reduce the weight of the connecting structure 25 and provide a certain insulation effect.

[0148] refer to Figures 5 to 8 In some embodiments, the pressure relief structure 24 includes a first diaphragm 241, which is opposite to the interior of the housing 21. The first diaphragm 241 is used to rupture when the pressure inside the receiving space 2121 is greater than a preset threshold. The first diaphragm 241 is connected to the connecting structure 25.

[0149] The first diaphragm 241 refers to the structure in the pressure relief structure 24 mainly used to release the pressure in the containment space 2121. The first diaphragm 241 can rupture when the pressure inside the containment space 2121 exceeds a preset threshold, so that the pressure inside the containment space 2121 can be released to the external environment. Since the pressure increase inside the containment space 2121 is usually accompanied by the temperature increase, the first diaphragm 241 can be a thermoplastic structure to melt and rupture when the temperature is too high. The first diaphragm 241 can also be a mechanical structure to rupture when the pressure is too high. The first diaphragm 241 can be square, round or other shapes. The material of the first diaphragm 241 can include metal, graphite or other materials.

[0150] The preset threshold is the value corresponding to the pressure in the containment space 2121 that will cause damage to the battery cell 20. The first diaphragm 241 can rupture when the pressure reaches the preset threshold to release and reduce the pressure in the containment space 2121 and protect the battery cell 20.

[0151] The first diaphragm 241 is connected to the connecting structure 25. The first diaphragm 241 can also be connected to the connector 251 or the reinforcing member 252. Depending on the material of the first diaphragm 241, the first diaphragm 241 can be connected to the connecting structure 25 by welding, bonding or other means.

[0152] For example, the reinforcing member 252 is provided with a through hole, and the first surface 2111 of the outer shell 21 is provided with a corresponding through hole. The first diaphragm 241 is connected to the reinforcing member 252 and covers the through hole on the reinforcing member 252. When the pressure inside the accommodating space 2121 is greater than a preset threshold, the first diaphragm 241 ruptures, and the pressure inside the accommodating space 2121 is released to the external environment through the through hole of the first surface 2111 and the through hole of the reinforcing member 252.

[0153] This embodiment provides some specific structures for the pressure relief structure 24, so that the pressure relief structure 24 can release the pressure inside the casing 21 when the internal pressure exceeds a preset threshold, thereby improving the safety performance of the battery cell 20.

[0154] refer to Figure 8 In some embodiments, the connecting structure 25 is provided with a weak structure, which serves as a first diaphragm 241.

[0155] A weak structure refers to a structure on the connecting structure 25 whose strength is lower than that of the adjacent parts. The weak structure can be set on the connector 251, or on the reinforcing member 252 or other structures of the connecting structure 25. The strength of the weak structure can be lower than that of the adjacent structures, or the melting point of the weak structure can be lower than that of the adjacent parts.

[0156] The weak structure is used as the first diaphragm 241, that is, the weak structure can rupture when the pressure in the containment space 2121 is greater than a preset threshold.

[0157] For example, when the pressure relief structure 24 is provided on the reinforcing member 252, the weak structure is formed on the reinforcing member 252. The weak structure can be formed by stamping, and the thickness of the weak structure is less than the thickness of other parts of the reinforcing member 252.

[0158] In this embodiment, the first diaphragm 241 is made part of the connecting structure 25, which reduces the number of components and lowers the assembly difficulty.

[0159] refer to Figures 5 to 7 In some embodiments, the pressure relief structure 24 further includes a second diaphragm 242 connected to the connection structure 25. The second diaphragm 242 is disposed on the side of the first diaphragm 241 away from the outer casing 21, and the second diaphragm 242 covers the first diaphragm 241.

[0160] The second diaphragm 242 refers to the structure in the pressure relief structure 24 used to protect the first diaphragm 241. The second diaphragm 242 is located on the side of the first diaphragm 241 away from the outer shell 21, that is, the second diaphragm 242 is located on the side of the first diaphragm 241 facing the outside, so as to protect the first diaphragm 241 and reduce the risk of damage to the first diaphragm 241 caused by the external environment. The second diaphragm 242 can be square, round or other shapes. The material of the second diaphragm 242 can include plastic or other materials.

[0161] The second diaphragm 242 covers the first diaphragm 241. The second diaphragm 242 may completely cover the first diaphragm 241 or only cover a portion of the first diaphragm 241. The area of ​​the second diaphragm 242 may be greater than the area of ​​the first diaphragm 241 or equal to the area of ​​the first diaphragm 241.

[0162] The second diaphragm 242 is connected to the connecting structure 25. The second diaphragm 242 can be connected to the connector 251, or to the reinforcing member 252 or other parts of the connecting structure 25. The second diaphragm 242 can be connected to the connecting structure 25 by bonding, welding or other means.

[0163] For example, both the first diaphragm 241 and the second diaphragm 242 are connected to the reinforcement 252, the second diaphragm 242 is connected to the side of the reinforcement 252 away from the outer shell 21, and the second diaphragm 242 completely covers the first diaphragm 241.

[0164] This embodiment further provides some specific structures of the pressure relief structure 24, including a second diaphragm 242 that covers the first diaphragm 241, so as to protect the first diaphragm 241 through the second diaphragm 242, reduce the damage that the external environment may cause to the first diaphragm 241, and improve the stability of the pressure relief structure 24.

[0165] refer to Figure 9 In some embodiments, the two electrode terminals 23 are arranged along a first direction, and the minimum dimension of the pressure relief structure 24 is in the first direction.

[0166] Two electrode terminals 23 are arranged along a first direction, which can be the length direction X of the battery cell 20 or other directions; for example, the first direction is the length direction X of the battery cell 20.

[0167] The minimum dimension of the pressure relief structure 24 is in the first direction, that is, the dimension of the pressure relief structure 24 in the first direction is smaller than the dimension of the pressure relief structure 24 in other directions. For example, when the pressure relief structure 24 is a rectangular structure, the short side of the pressure relief structure 24 can be parallel to the first direction; when the pressure relief structure 24 is an elliptical structure, the minor axis of the pressure relief structure 24 can be parallel to the first direction.

[0168] This configuration can reduce the space occupied by the pressure relief structure 24 in the first direction, thereby further reducing the distance between the two electrode terminals 23, and can reduce the size of the portion of the housing 21 around the pressure relief structure 24 in the first direction, thereby better reducing the deformation of the portion of the housing 21 around the pressure relief structure 24, and better protecting the pressure relief structure 24.

[0169] For example, when the pressure relief structure 24 is a racetrack-shaped structure, the long side of the pressure relief structure 24 is perpendicular to the first direction.

[0170] In this embodiment, the minimum size of the pressure relief structure 24 is made in the first direction so that the distance between the two electrode terminals 23 can be further reduced, thereby further reducing the deformation of the portion of the housing 21 around the pressure relief structure 24.

[0171] refer to Figure 10 In some embodiments, the center-to-center distance between the two electrode terminals 23 ranges from 20 mm to 60 mm.

[0172] The center distance between the two electrode terminals 23 is the distance between the centers of the two electrode terminals 23 in the first direction. The center of the electrode terminal 23 is the centroid of the electrode terminal 23, which is also the intersection of the multiple axes of symmetry of the electrode terminal 23. For example, when the electrode terminal 23 has a cylindrical structure, the center distance is the distance between the axes of the two electrode terminals 23.

[0173] Referring to the figure, the center distance between the two electrode terminals 23 is the dimension shown by L in the figure, which ranges from 20mm to 60mm; for example, this dimension can be 20mm, 30mm, 40mm, 50mm, 60mm or other values.

[0174] For example, the center distance between the two electrode terminals 23 can be 20 mm, and the minimum size of the pressure relief structure 24 can be made in the first direction. At this time, the distance between the two electrode terminals 23 is small, the size of the portion of the housing 21 around the pressure relief structure 24 in the first direction is small, the deformation of the portion of the housing 21 around the pressure relief structure 24 is also small, and the pressure relief structure 24 is more difficult to be damaged.

[0175] For example, the center distance between the two electrode terminals 23 can be 40mm, and the arrangement direction of the pressure relief structure 24 can be multiple. In this case, the spacing between the two electrode terminals 23 is moderate, and the risk of damage to the pressure relief structure 24 is low.

[0176] For example, the center distance between the two electrode terminals 23 can be 60mm. In this case, the arrangement direction of the pressure relief structure 24 is more flexible and can be set according to requirements. At the same time, the installation difficulty of the two electrode terminals 23 is also lower.

[0177] This embodiment provides a range of center-to-center spacing between some electrode terminals 23 to reduce the deformation of the portion of the housing 21 around the pressure relief structure 24, improve the stability of the pressure relief structure 24, and reduce the risk of failure of the pressure relief structure 24 after being subjected to impact.

[0178] refer to Figure 4 , Figure 5 In some embodiments, the electrode terminal 23 is a cylindrical or prismatic structure.

[0179] The electrode terminal 23 can be a cylindrical structure. In this case, the axis of the electrode terminal 23 passes through the first surface 2111 of the outer shell 21, so that one end of the electrode terminal 23 can extend into the receiving space 2121, and the other end of the electrode terminal 23 can be exposed to the external environment so as to connect with the external electrical connection structure 25. In the event of a collision with the outer shell 21, it is difficult for stress concentration points to form on the periphery of the cylindrical electrode terminal 23, thereby improving the overall strength of the structure and reducing the local deformation and damage that may be caused by local stress concentration.

[0180] The electrode terminal 23 can also be a prismatic structure, such as a cuboid, pentagonal prism or other prismatic structure. In this case, the height direction of the electrode terminal 23 is parallel or approximately parallel to the height direction Z of the battery cell 20. The side of the electrode terminal 23 exposed to the external environment is parallel or approximately parallel to the first surface 2111. One end of the electrode terminal 23 along its height direction passes through the first surface 2111 of the housing 21 and extends into the receiving space 2121. The other end of the electrode terminal 23 is exposed to the external environment so as to facilitate connection with the external electrical connection structure 25. With this configuration, the connection area between the electrode terminal 23 and the external electrical connection structure 25 is larger, the connection is more stable, and the current flow area from the electrode terminal 23 to the external electrical connection structure 25 is also larger.

[0181] This embodiment provides some structures for the electrode terminals 23, making the electrode terminals 23 cylindrical to reduce the risk of stress concentration on the electrode terminals 23 and improve the strength of the electrode terminals 23; making the electrode terminals 23 prismatic to increase the connection area between the electrode terminals 23 and the external electrical connection structure 25 (e.g., a bar plate), and to improve the current-carrying area and current-carrying capacity of the electrode terminals 23.

[0182] refer to Figures 5 to 7 In some embodiments, at least one side of the electrode terminal 23 is an arc surface 231, which is part of a cylindrical surface, and the axis of the arc surface 231 is perpendicular to the first surface 2111.

[0183] The side surface of electrode terminal 23 refers to the surface surrounding electrode terminal 23 in the height direction, that is, the various surfaces of electrode terminal 23 that intersect with the first surface 2111; at least one side surface of electrode terminal 23 is an arc surface 231, which is a part of a cylindrical surface, and the central angle of the arc surface 231 can be 180°, 90° or other angles; the axis of the arc surface 231 is perpendicular to the first surface 2111, that is, the line formed by the intersection of the arc surface 231 and the first surface 2111 is an arc; the number of arc surfaces 231 can be one, two or more.

[0184] In addition to the arc surface 231, each side of the electrode terminal 23 may also include a flat surface; in this case, the arrangement can reduce the stress concentration between the electrode terminal 23 and the housing 21 at the arc surface 231, and also enable the electrode terminal 23 and the external electrical connection structure 25 to have a larger contact area.

[0185] For example, the side of the electrode terminal 23 includes an arc surface 231. In this case, the electrode terminal 23 includes an integrally formed first part and a second part, wherein the first part is semi-cylindrical and the second part is cuboid, and the planar side of the first part is connected to the second part.

[0186] In this embodiment, at least one side of the electrode terminal 23 is an arc surface 231 to reduce the number of edges on the side of the electrode terminal 23. This arrangement can reduce stress concentration in the electrode terminal 23 and also give the electrode terminal 23 a larger flow area.

[0187] refer to Figure 3 In some embodiments, the housing 21 includes a housing 212 and an end cap 211 connected to the housing 212, a receiving space 2121 is formed inside the housing 212, and the housing 212 has an opening; the end cap 211 closes to the opening, and the first surface 2111 is the surface of the end cap 211 facing away from the receiving space 2121.

[0188] End cap 211 refers to a component that covers the opening of housing 212 to isolate the internal environment of battery cell 20 from the external environment; housing 212 is an assembly used to cooperate with end cap 211 to form the internal environment of battery cell 20.

[0189] The housing 212 has an opening, and the receiving space 2121 can be connected to the external environment through the opening. After the end cap 211 is closed to the opening of the housing 212, it can form a closed receiving space 2121.

[0190] The first surface 2111 refers to the surface of the end cap 211 facing the external environment. The electrode terminal 23 and the pressure relief structure 24 are both located on the first surface 2111. One end of the electrode terminal 23 can pass through the end cap 211 from the first surface 2111 and extend into the receiving space 2121. One side of the pressure relief structure 24 can pass through the receiving space 2121 from the first surface 2111 to release the pressure in the receiving space 2121 to the external environment.

[0191] This embodiment provides some specific structures for the housing 21 so that the housing 21 can provide a mounting base for the electrode terminals 23 and the pressure relief structure 24.

[0192] refer to Figures 10 to 12In some embodiments, the first surface 2111 is provided with a mounting groove 2112, and at least a portion of the connecting structure 25 is accommodated in the mounting groove 2112; the first surface 2111 is provided with a first through hole 2113 and two second through holes 2114 located in the mounting groove 2112, the first through hole 2113 corresponds to the pressure relief structure 24, and the two second through holes 2114 correspond to the two electrode terminals 23 respectively.

[0193] The mounting groove 2112 refers to the groove structure provided on the first surface 2111. The mounting groove 2112 is provided on the first surface 2111 of the end cover 211, that is, the opening of the mounting groove 2112 faces the outside, and the bottom of the groove faces the receiving space 2121. The cross-sectional shape of the mounting groove 2112 can be square, trapezoidal or other shapes. The mounting groove 2112 can be a straight groove, a stepped groove or other groove structure.

[0194] The first through hole 2113 is a hole structure provided in the mounting groove 2112. The first through hole 2113 can be provided at the bottom of the mounting groove 2112. The first through hole 2113 can be a square hole, a round hole or other shaped hole structure. The first through hole 2113 can be a straight hole, a stepped hole, a tapered hole or other hole structure.

[0195] Similar to the first through hole 2113, the second through hole 2114 is a hole structure provided in the mounting groove 2112. The second through hole 2114 can be provided at the bottom of the mounting groove 2112. The second through hole 2114 can be a square hole, a round hole or other shaped hole structure. The second through hole 2114 can be a straight hole, a stepped hole, a tapered hole or other hole structure.

[0196] At least a portion of the connecting structure 25 is accommodated within the mounting groove 2112, that is, the connecting structure 25 may be accommodated only partially within the mounting groove 2112, or the connecting structure 25 may be accommodated completely within the mounting groove 2112; when the connecting structure 25 is partially accommodated within the mounting groove 2112, the side of the connecting structure 25 facing the receiving groove is accommodated within the receiving groove.

[0197] After the connecting structure 25 is accommodated in the mounting groove 2112, the pressure relief structure 24 corresponds to the first through hole 2113. The pressure relief structure 24 can be located outside the first through hole 2113 and on the side of the first through hole 2113 away from the accommodating space 2121. The pressure relief structure 24 can also extend partially into the first through hole 2113 to release the pressure in the accommodating space 2121.

[0198] After the connection structure 25 is accommodated in the mounting groove 2112, one end of the electrode terminal 23 passes through the second through hole 2114 and extends into the accommodating space 2121. Accordingly, the number of the second through holes 2114 is at least two, that is, the number of the second through holes 2114 can be two, or three or more.

[0199] The mounting groove 2112 allows the connecting structure 25 to connect to the bottom and inner wall of the mounting groove 2112, increasing the connection area between the connecting structure 25 and the outer shell 21. This allows the connecting structure 25 to better distribute the force on the first surface 2111 of the outer shell 21, and also allows the connecting structure 25 to better improve the strength of the outer shell 21 on the first surface 2111, reducing the deformation of the outer shell 21 around the pressure relief structure 24. At the same time, this design also improves the connection stability between the connecting structure 25 and the outer shell 21.

[0200] In this embodiment, a mounting groove 2112 is provided on the first surface 2111 to accommodate at least a portion of the connecting structure 25. The connecting structure 25 can be connected to both the bottom surface of the mounting groove 2112 and the inner sidewall of the mounting groove 2112. That is, this arrangement can also increase the connection area between the mounting groove 2112 and the connecting structure 25, thereby improving the connection stability of the connecting structure 25.

[0201] refer to Figures 10 to 12 In some embodiments, the mounting groove 2112 is provided with a reinforcing structure 2115 connected to the end cap 211.

[0202] The reinforcing structure 2115 refers to the structure used to improve the strength of the end cap 211. The reinforcing structure 2115 can be a strip structure, a sheet structure, or other shapes. The reinforcing structure 2115 can be circular, square, or other shapes. The reinforcing structure 2115 is connected to the end cap 211 and accommodated in the mounting groove 2112. The reinforcing structure 2115 can be connected to the bottom or inner wall of the mounting groove 2112. The reinforcing structure 2115 can be connected to the end cap 211 by welding, bonding, or other methods. The reinforcing structure 2115 can also be integrally formed with the end cap 211. The material of the reinforcing structure 2115 can include metal, plastic, or other materials. The material of the reinforcing structure 2115 can be the same as or different from the material of the end cap 211.

[0203] The reinforcing structure 2115 may be provided on one or more sides of the first through hole 2113 and / or the second through hole 2114, or the reinforcing structure 2115 may be provided around the first through hole 2113 and / or the second through hole 2114; for example, the reinforcing structure 2115 is provided around the first through hole 2113.

[0204] When the connecting structure 25 is installed in the mounting groove 2112, the reinforcing structure 2115 can be connected to the connecting structure 25 or spaced apart from the connecting structure 25; for example, the reinforcing structure 2115 abuts against the connecting structure 25.

[0205] The reinforcement structure 2115 can improve the strength of the end cap 211 at the mounting groove 2112. In the event of a collision with the battery cell 20, this arrangement can reduce the deformation of the end cap 211 at the mounting groove 2112, thereby reducing the risk of damage to the pressure relief structure 24.

[0206] In some embodiments, the battery cell 20 includes a housing 21, an electrode assembly 22, electrode terminals 23, a pressure relief structure 24, and a connection structure 25; the two electrode terminals 23 are disposed on both sides of the pressure relief structure 24 and are disposed adjacent to the pressure relief structure 24.

[0207] The outer casing 21 includes a housing 212 and an end cap 211 covering the housing 212; a receiving space 2121 is formed inside the housing 212, and the electrode assembly 22 is received in the receiving space 2121.

[0208] The connecting structure 25 includes an annular connector 251, which encloses an inner space 2511; the connecting structure 25 also includes a reinforcing member 252, which is connected to the connector 251 and divides the inner space 2511 into two subspaces 25111; two electrode terminals 23 are respectively accommodated in the two subspaces 25111, and a pressure relief structure 24 is connected to the reinforcing member 252.

[0209] The pressure relief structure 24 includes a first diaphragm 241, which is a weak structure formed by the stamping reinforcement 252; the pressure relief structure 24 also includes a second diaphragm 242 connected to the reinforcement 252, which is located on the side of the reinforcement 252 away from the receiving space 2121.

[0210] The connecting structure 25 also includes a fixing member 253, which is an injection molded structural component. Specifically, after the connecting member 251, electrode terminal 23 and pressure relief structure 24 are fixed in the mold, the fixing member 253 is formed by injection molding into the mold.

[0211] The end cap 211 has a first surface 2111, which is located on the side of the end cap 211 away from the receiving space 2121. A mounting groove 2112 is provided on the first surface 2111, and a first through hole 2113 is provided at the bottom of the mounting groove 2112. Two second through holes 2114 are provided on both sides of the first through hole 2113. A reinforcing structure 2115 is provided in the mounting groove 2112, and the reinforcing structure 2115 surrounds the pressure relief structure 24.

[0212] The connection structure 25 is installed in the mounting groove 2112, the first diaphragm 241 corresponds to the first through hole 2113, and the two electrode terminals 23 pass through the two second through holes 2114 respectively.

[0213] Secondly, embodiments of this application also provide a battery device 100, including a battery cell 20 provided in some embodiments of the first aspect.

[0214] In this battery device 100, the battery cell 20 has strong impact resistance, and the pressure relief structure 24 is not easily damaged when the bottom of the battery cell 20 is subjected to force or impact.

[0215] The bottom of the battery cell 20 can face the ground. When the battery device 100 is hit by gravel or bumps on the road, the bottom of the battery cell 20 is impacted and the impact energy is transferred to the end cap 211 of the battery cell 20. At this time, the deformation of the part of the end cap 211 around the pressure relief structure 24 is small, the pressure relief structure 24 is not easily damaged, and the stability of the battery cell 20 is strong.

[0216] The battery assembly 100 can serve as at least part of the floor structure of the vehicle 1000. For example, when the battery assembly 100 serves as the floor structure of the vehicle 1000, the bottom of the battery cell 20 can face upward and provide support for the housing 10 of the battery assembly 100, while the electrode terminals 23 and the pressure relief structure 24 of the battery cell 20 face the ground.

[0217] The battery device 100 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 20, which are connected in series, parallel, or mixed connections via busbars.

[0218] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 20.

[0219] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 20 together. As an example, a battery module can also be formed by bundling multiple battery cells 20 together with cable ties.

[0220] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 10 and one or more individual battery cells housed within the housing 10.

[0221] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0222] As an example, the battery cell assembly can also be housed in the housing 10 by directly fixing multiple battery cells 20 to the housing 10.

[0223] As an example, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0224] As an example, the housing 10 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 the interior of the housing 10 forms an enclosed space to accommodate the battery cell assembly.

[0225] In some embodiments, the housing 10 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0226] Thirdly, embodiments of this application also provide an electrical device, including the battery device 100 provided in some embodiments of the second aspect.

[0227] In the event of an impact, the pressure relief structure 24 of the battery cell 20 is not easily damaged, thus making the thermal management system of the electrical device more stable.

[0228] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 20, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0229] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, include: An outer casing having a first surface and an interior space therein; A pressure relief structure is disposed on the first surface, and at least a portion of the pressure relief structure passes through the outer shell and communicates with the receiving space; Two electrode terminals are disposed on the first surface and located on opposite sides of the pressure relief structure. One end of each electrode terminal passes through the first surface and extends into the receiving space. The two electrode terminals are disposed adjacent to the pressure relief structure.

2. The battery cell of claim 1, wherein, The battery cell also includes a connection structure, and the pressure relief structure and the two electrode terminals are all connected to the connection structure, which is connected to the first surface.

3. The battery cell according to claim 2, characterized in that, The connection structure includes a connector, which is connected to the first surface; The connector is arranged around the pressure relief structure and the two electrode terminals, forming an inner space, with portions of the two electrode terminals and portions of the pressure relief structure both accommodated within the inner space.

4. The battery cell according to claim 3, characterized in that, The connection structure further includes a reinforcing member connected to the connector, the reinforcing member dividing the inner space into at least two subspaces, each electrode terminal corresponding to at least one of the subspaces, and at least a portion of the electrode terminal being accommodated in the corresponding subspace.

5. The battery cell according to claim 4, characterized in that, The pressure relief structure is connected to the reinforcing member.

6. The battery cell according to any one of claims 3-5, characterized in that, The connector is a metal structural component, and the connector is welded to the outer shell.

7. The battery cell according to any one of claims 3-5, characterized in that, The connection structure also includes a fixing member connected to the side of the connector away from the housing. The pressure relief structure and the two electrode terminals are both connected to the fixing member.

8. The battery cell according to claim 7, characterized in that, The fastener is an injection-molded structural component.

9. The battery cell according to any one of claims 2-5, characterized in that, The pressure relief structure includes a first diaphragm, which is opposite to the interior of the outer shell. The first diaphragm is used to rupture when the pressure inside the containment space exceeds a preset threshold. The first diaphragm is connected to the connection structure.

10. The battery cell according to claim 9, characterized in that, The connection structure has a weak structure, which serves as the first diaphragm.

11. The battery cell according to claim 9, characterized in that, The pressure relief structure further includes a second diaphragm connected to the connection structure. The second diaphragm is disposed on the side of the first diaphragm away from the outer shell, and the second diaphragm covers the first diaphragm.

12. The battery cell according to any one of claims 1-5, characterized in that, The two electrode terminals are arranged along a first direction, and the minimum dimension of the pressure relief structure is in the first direction.

13. The battery cell according to any one of claims 1-5, characterized in that, The center-to-center distance between the two electrode terminals ranges from 20 mm to 60 mm.

14. The battery cell according to any one of claims 1-5, characterized in that, The electrode terminals have a cylindrical or prismatic structure.

15. The battery cell according to any one of claims 1-5, characterized in that, At least one side of the electrode terminal is an arc surface, which is part of a cylindrical surface, and the axis of the arc surface is perpendicular to the first surface.

16. The battery cell according to any one of claims 2-5, characterized in that, The outer casing includes a housing and an end cap connected to the housing, the receiving space is formed within the housing, and the housing has an opening; The end cap closes to the opening, and the first surface is the surface of the end cap that faces away from the receiving space.

17. The battery cell according to claim 16, characterized in that, The first surface is provided with a mounting groove, and at least a portion of the connecting structure is accommodated within the mounting groove; The first surface is provided with a first through hole and two second through holes located in the mounting groove. The first through hole corresponds to the pressure relief structure, and the two second through holes correspond to the two electrode terminals respectively.

18. The battery cell according to claim 17, characterized in that, The mounting groove is provided with a reinforcing structure that connects to the end cap.

19. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-18.

20. An electrical appliance, characterized in that, Includes the battery device as described in claim 19.

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