Battery monomer, battery device and electric equipment
By designing a protruding and recessed structure and a hollow area at the bottom of the battery cell casing, the problem of insufficient bending stiffness and compressive strength at the bottom of the casing is solved, ensuring that the explosion-proof valve can open normally in the event of thermal runaway, thus improving the safety of the battery cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2026-02-02
- Publication Date
- 2026-04-17
AI Technical Summary
The existing battery cell casing has insufficient bending stiffness and compressive strength at the bottom, which causes the exhaust channel of the explosion-proof valve to be blocked during thermal runaway, affecting its normal opening and posing a safety hazard.
The bottom of the housing is designed with a combination of protrusions and recesses, which, together with the hollowed-out area, form a stable combination and fixation, enhancing the bending stiffness and compressive strength of the bottom of the housing, and ensuring that the explosion-proof valve can open normally in the event of thermal runaway.
It improves the safety of individual battery cells under thermal runaway conditions, prevents airway blockage, ensures the normal opening of the explosion-proof valve, and achieves effective pressure relief, thereby enhancing the safety of individual battery cells.
Smart Images
Figure CN224138277U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and electrical equipment. Background Technology
[0002] In the battery industry, to prevent thermal runaway of a single battery cell from affecting the operation of the entire battery device, an explosion-proof valve is typically installed at the bottom of the battery cell's casing. However, in related technologies, due to insufficient bending stiffness and compressive strength at the bottom of the casing, the explosion-proof valve at the bottom often experiences obstruction of its venting passage when thermal runaway occurs due to factors such as the collapse of the electrode assembly under its own weight, structural deformation, and stacking misalignment. This obstruction affects the normal opening function of the explosion-proof valve, ultimately leading to safety hazards. Utility Model Content
[0003] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, which aims to improve the bending stiffness and compressive strength of the bottom of the casing, so as to improve the safety of the battery cell under thermal runaway conditions.
[0004] This application provides a battery cell, including a housing and an electrode assembly disposed within the housing. The housing includes a housing body and a gasket. The bottom of the housing body has a mounting hole configured to install an explosion-proof valve. The electrode assembly is disposed within the housing body. The gasket is disposed within the housing body and located between the inner bottom surface of the housing body and the electrode assembly. The inner bottom surface of the housing body has a protrusion, and the side of the gasket near the inner bottom surface of the housing body has a recess, with the protrusion and recess providing a limiting fit. The gasket also has a hollow area that communicates with the mounting hole.
[0005] In the technical solution of this application embodiment, the gasket and the shell body can be stably fixed by the cooperation of the protrusion and the recess. This design not only enables the gasket to provide a solid support for the electrode assembly, but also restricts the slippage of the gasket during the assembly, transportation or use of the electrode assembly. At the same time, the protrusion design can disperse external loads such as drops and compressions to the shell body by increasing the local material thickness and changing the stress distribution, which significantly improves the bending stiffness and compressive strength of the bottom of the shell. It can also avoid stress concentration and prevent deformation and cracking. Thus, when the battery cell experiences thermal runaway, the large amount of gas generated by the electrode assembly can be released through the hollow area and mounting hole to open the bottom explosion-proof valve. This effectively prevents the gas passage blockage caused by the collapse of the electrode assembly due to its own weight, structural deformation, and stacking misalignment, ensuring that the explosion-proof valve can open normally under thermal runaway conditions and effectively release pressure, thereby improving the safety of the battery cell under thermal runaway conditions.
[0006] In some embodiments, the protrusions and recesses are interference-fitted. This design, when the gasket is installed in the housing body, allows the gasket and housing body to form a more stable combination and fixation by using an interference fit between the protrusion on the housing body and the recess on the gasket. This not only enables the gasket to provide solid support for the electrode assembly, but also effectively limits the slippage of the gasket during the assembly, transportation, or use of the electrode assembly.
[0007] In some embodiments, multiple protrusions and recesses are provided. At least one protrusion is provided at each corner of the housing body, and at least one recess is provided at each corner of the gasket. The multiple protrusions and recesses engage one-to-one. This design, with multiple protrusions and recesses engaging one-to-one between the gasket and the housing body, further enhances the positioning reliability between the gasket and the housing body, enabling a more stable combination and fixation. This allows the gasket to provide robust support for the electrode assembly and effectively limits the slippage of the gasket during assembly, transportation, or use of the electrode assembly.
[0008] In some embodiments, the protrusion and the shell body are integrally formed. This design, employing an integrally formed structure, ensures the stability and reliability of the structure.
[0009] In some embodiments, the root peripheral wall of the protrusion connecting to the shell body has a rounded corner, which abuts against the bottom surface of the gasket, forming a channel between the bottom surface of the gasket and the inner bottom surface of the shell body. This channel communicates with the mounting hole and the hollowed-out area. This design, with its rounded corner, elevates the gasket, creating a channel between its bottom surface and the inner bottom surface of the shell body. This allows the electrolyte to diffuse not only from the hollowed-out area to the electrode material of the electrode assembly but also from the channel, further ensuring the electrolyte's wetting path and improving the diffusion effect from the gasket to the electrode material. Furthermore, it optimizes the flow performance of the bottom gas channel, allowing gas generated by the electrode assembly to flow not only from the hollowed-out area to the mounting hole but also from the channel to the mounting hole, further ensuring the explosion-proof valve can open normally under thermal runaway conditions, achieving effective pressure relief.
[0010] In some embodiments, the raised top surface is flush with the top surface of the gasket. This design provides more sufficient and stable support for the electrode assembly through the cooperation of the protrusion and the recess, leaving sufficient space and channel between the electrode assembly and the explosion-proof valve, and ensuring that the alignment of the explosion-proof valve is not affected by the assembly, transportation or use of the electrode assembly, thus achieving precise matching between the explosion-proof valve and the hollow area of the gasket.
[0011] In some embodiments, the perforated area includes a first perforated hole and a second perforated hole; the first perforated hole is located above and communicates with the mounting hole; the second perforated hole is located on both sides of the first perforated hole and communicates with it. This design, on the one hand, allows the electrolyte to diffuse from the first and second perforated holes to the electrode material of the electrode assembly, further ensuring the electrolyte's wetting path and improving the diffusion effect of the electrolyte from the gasket to the electrode material of the electrode assembly; on the other hand, it also optimizes the flow performance of the bottom gas channel, allowing gas generated by the electrode assembly to flow from the first and second perforated holes to the mounting hole, further ensuring that the explosion-proof valve can open normally under thermal runaway conditions, achieving effective pressure relief.
[0012] In some embodiments, multiple second perforations are provided on both sides of the first perforation. The multiple second perforations located on the same side of the first perforation are spaced apart along a first direction, and extend along a second direction, with the first and second directions forming an angle. This design increases the distribution area of the second perforations, thereby increasing the wetting path of the electrolyte and further improving the diffusion effect of the electrolyte from the gasket to the electrode material of the electrode assembly. It also increases the flow path of the bottom gas channel, allowing gas generated by the electrode assembly to flow from the first perforation and the multiple second perforations to the mounting hole, further ensuring that the explosion-proof valve can open normally under thermal runaway conditions and effectively release pressure.
[0013] In some embodiments, the first perforated hole has a center line, and second perforated holes located on both sides of the first perforated hole are symmetrically distributed along the center line of the first perforated hole. This symmetrical design allows for more uniform diffusion of the electrolyte and more uniform gas flow.
[0014] This application also provides a battery device, including a battery housing and a battery cell as described above.
[0015] This application also provides an electrical device, including the battery device described above.
[0016] 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 other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the vehicle of this application;
[0019] Figure 2 This is an exploded view of an embodiment of the battery device of this application;
[0020] Figure 3 This is an exploded view of one embodiment of the battery cell of this application;
[0021] Figure 4 This is a schematic diagram of the casing structure in one embodiment of the battery cell of this application;
[0022] Figure 5 This is a schematic diagram of the casing body in one embodiment of the battery cell of this application;
[0023] Figure 6 This is a schematic diagram of the gasket structure in one embodiment of a battery cell of this application;
[0024] Figure 7 This is a top view of the gasket in one embodiment of the battery cell of this application.
[0025] Explanation of icon numbers:
[0026]
[0027] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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).
[0033] 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 component 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.
[0034] 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.
[0035] Battery devices mentioned in this field can be classified into primary battery devices and rechargeable battery devices based on whether they are rechargeable. Currently, common types of rechargeable battery devices include lead-acid battery devices, nickel-metal hydride battery devices, and lithium-ion battery devices. Lithium-ion battery devices are currently widely used in pure electric vehicles and hybrid vehicles. Lithium-ion battery devices used for these applications have relatively lower capacity but higher output and charging current, and longer lifespan, but are also more expensive.
[0036] The battery device described in the embodiments of this application refers to a rechargeable battery device. The embodiments disclosed in this application will be described below primarily using a lithium-ion battery device as an example. It should be understood that the embodiments disclosed in this application are applicable to any other suitable type of rechargeable battery device. The battery devices mentioned in the embodiments disclosed in this application can be directly or indirectly applied to suitable devices to power those devices.
[0037] The battery device mentioned in the embodiments disclosed in this application refers to a single physical module comprising one or more battery cells to provide a predetermined voltage and capacity. A battery cell is the basic unit in a battery device, and generally, based on its packaging method, can be classified as: cylindrical battery cells, cuboid battery cells, and pouch battery cells. The following discussion will primarily focus on cuboid battery cells. It should be understood that the embodiments described below are also applicable in some respects to cylindrical or pouch battery cells.
[0038] A battery cell includes a casing, electrode assemblies, and electrolyte. The electrode assemblies are housed within the casing and include a positive electrode, a negative electrode, and a separator. The casing includes a bottom shell and a cover. The bottom shell includes a receiving cavity formed by multiple walls and an opening. The cover is disposed at the opening to close the receiving cavity. In addition to the electrode assemblies, the receiving cavity also contains the electrolyte. The positive and negative electrode assemblies in the electrode assemblies include tabs. To prevent melting due to high current flow, multiple positive tabs and multiple negative tabs are stacked together. The tabs are electrically connected to electrode terminals located outside the electrode assembly via connecting members. The electrode terminals generally include positive and negative electrode terminals. For a rectangular battery cell, the electrode terminals are generally located in the cover portion. Multiple electrode assemblies are connected in series and / or parallel via electrode terminals for various applications.
[0039] In high-power applications such as electric vehicles, battery systems are used at multiple levels: individual battery cells, battery modules, and battery packs. A battery module is formed by electrically connecting a number of individual battery cells and placing them in a frame to protect them from external shocks, heat, and vibration. A battery pack refers to the final state of the battery system installed in an electric vehicle. A battery pack typically includes a battery housing for encapsulating one or more individual battery cells.
[0040] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery device, as the power source, plays an irreplaceable and crucial role. The battery device consists of a battery casing and multiple individual battery cells housed within it. As a core component of new energy vehicles, the battery device has high safety requirements. Currently, the mechanical safety of the power battery device during use is one of the battery safety issues that consumers are generally concerned about.
[0041] The battery device provided in this application embodiment can be a power source for electrical devices. Electrical devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.
[0042] 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.
[0043] For example, Figure 1This is a schematic diagram of the structure of a vehicle 1000 according to an embodiment 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 vehicles, etc. The vehicle 1000 may have a battery device 100, a controller 200, and a motor 300 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation of the vehicle 1000. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source for the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide driving power for the vehicle 1000.
[0044] For example, please refer to Figure 2 , Figure 2 This is an exploded view of an embodiment of the battery device 100 of this application. The battery device 100 includes a battery housing 20 and a battery cell 10. The battery housing 20 has a receiving space for accommodating the battery cell 10. The battery housing 20 can adopt various structures. In some embodiments, the battery housing 20 may include a first portion 20a and a second portion 20b, which overlap each other, and together define the receiving space for accommodating the battery cell 10. The second portion 20b may be a hollow structure open at one end, and the first portion 20a may be a plate-like structure, covering the open side of the second portion 20b so that the first portion 20a and the second portion 20b together define the receiving space; alternatively, the first portion 20a and the second portion 20b may both be hollow structures open on one side, with the open side of the first portion 20a covering the open side of the second portion 20b. Of course, the battery box 20 formed by the first part 20a and the second part 20b can be of various shapes, such as cylinder, cuboid, etc.
[0045] In the battery device 100, there can be one or more battery cells 10. When the battery device 100 has multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed manner, and then the whole formed by the multiple battery cells 10 is housed in the battery housing 20. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 10 in series, in parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, in parallel, or in a mixed manner to form a whole, which is housed in the battery housing 20.
[0046] In the battery industry, to prevent thermal runaway of a single battery cell from affecting the operation of the entire battery device, an explosion-proof valve is typically installed at the bottom of the battery cell's casing. However, in related technologies, due to insufficient bending stiffness and compressive strength at the bottom of the casing, the explosion-proof valve at the bottom often experiences obstruction of its venting passage when thermal runaway occurs due to factors such as the collapse of the electrode assembly under its own weight, structural deformation, and stacking misalignment. This obstruction affects the normal opening function of the explosion-proof valve, ultimately leading to safety hazards.
[0047] To address the aforementioned issues, this application proposes a battery cell 10 designed to improve the bending stiffness and compressive strength of the bottom of the casing 1, thereby enhancing the safety of the battery cell 10 under thermal runaway conditions. The following detailed description, in conjunction with specific accompanying drawings and embodiments, further illustrates this design.
[0048] Please see Figures 3 to 7 In one embodiment of this application, the battery cell 10 includes a housing 1 and an electrode assembly 13 disposed within the housing 1. The housing 1 includes a housing body 11 and a gasket 12. The bottom of the housing body 11 is provided with a mounting hole 111, which is configured to install an explosion-proof valve. The electrode assembly 13 is disposed within the housing body 11. The gasket 12 is disposed within the housing body 11 and is located between the inner bottom surface of the housing body 11 and the electrode assembly 13. The inner bottom surface of the housing body 11 is provided with a protrusion 112, and the side of the gasket 12 near the inner bottom surface of the housing body 11 is provided with a recess 121. The protrusion 112 and the recess 121 are mutually restrictive. The gasket 12 is also provided with a hollow area 122, which communicates with the mounting hole 111.
[0049] In this embodiment, the gasket 12 is also called a base plate, mainly used for insulation and protection between the electrode assembly 13 and the housing 1, protecting the internal safety of the electrode assembly 13. When the gasket 12 is installed inside the housing body 11, the bottom surface of the gasket 12 can directly abut against the inner bottom surface of the housing body 11, so that the gas generated by the electrode assembly 13 can flow directly from the perforated area 122 on the gasket 12 to the explosion-proof valve at the mounting hole 111; or, the bottom surface of the gasket 12 can also form a channel between it and the inner bottom surface of the housing body 11, so that the gas generated by the electrode assembly 13 can flow from the perforated area 122 on the gasket 12 and the channel between the bottom surface of the gasket 12 and the inner bottom surface of the housing body 11 to the explosion-proof valve at the mounting hole 111.
[0050] In some embodiments, the pad 12 can be made of polyimide so that the pad 12 can withstand a high temperature of 300°C, so that even under the condition of overcharge thermal runaway of the battery cell 10, the pad 12 can still play a role in providing stable support for the electrode assembly 13.
[0051] In practical applications, the mounting holes 111 on the shell body 11 can be, but are not limited to, square, round, racetrack-shaped, etc., and can be adapted to the shape of the explosion-proof valve.
[0052] The shape of the protrusion 112 can be, but is not limited to, rectangular, square, circular, elliptical, polygonal, etc. Similarly, the shape of the recess 121 can also be, but is not limited to, rectangular, square, circular, elliptical, polygonal, etc. Specifically, the shapes of the protrusion 112 and the recess 121 can be adapted to each other. Furthermore, the recess 121 can be a groove that does not penetrate the gasket 12, or it can be an opening that penetrates the gasket 12. In practical applications, the protrusion 112 and the recess 121 can be used with an interference fit, or they can be used with a tight fit or a clearance fit. For example, the clearance between the protrusion 112 and the recess 121 can be a small clearance such as 0, 0.001 mm, or 0.002 mm. This clearance needs to ensure that the mounting hole 111 and the hollow area 122 are not disconnected when the gasket 12 slides.
[0053] The perforated area 122 on the gasket 12 is connected to the mounting hole 111. That is, at least a portion of the perforated area 122 is located above the mounting hole 111. When the battery cell 10 experiences thermal runaway, the large amount of gas generated by the electrode assembly 13 can be released by opening the bottom explosion-proof valve through the perforated area 122 and the mounting hole 111. The shape of the perforated area 122 can be the same as or different from the shape of the mounting hole 111, as long as the perforated area 122 is connected to the mounting hole 111 so that the gas generated by the electrode assembly 13 can flow from the perforated area 122 to the mounting hole 111, and the electrolyte can diffuse from the perforated area 122 to the electrode material of the electrode assembly 13.
[0054] In summary, in the technical solution of this application embodiment, the gasket 12 and the shell body 11 can be stably fixed by the cooperation of the protrusion 112 and the recess 121. This design not only enables the gasket 12 to provide a stable support for the electrode assembly 13, but also restricts the slippage of the gasket 12 during the assembly, transportation or use of the electrode assembly 13. At the same time, the design of the protrusion 112 can disperse external loads such as drops and compressions onto the shell body 11 by increasing the local material thickness and changing the stress distribution, which significantly improves the bending stiffness and compressive strength of the bottom of the shell 1, and can also avoid stress concentration and prevent deformation and cracking. Thus, when the battery cell 10 experiences thermal runaway, the large amount of gas generated by the electrode assembly 13 can be released through the hollow area 122 and the mounting hole 111 to open the bottom explosion-proof valve, effectively preventing the gas passage blockage caused by the collapse of the electrode assembly 13 due to its own weight, structural deformation, and stacking misalignment. This ensures that the explosion-proof valve can open normally under thermal runaway conditions, effectively releasing pressure and thus improving the safety of the battery cell 10 under thermal runaway conditions.
[0055] In addition, the gasket 12 adopts a hollow area 122 design, which on the one hand allows the electrolyte to diffuse smoothly from the hollow area 122 to the electrode material of the electrode assembly 13, ensuring the wetting path of the electrolyte and improving the diffusion effect of the electrolyte from the gasket 12 to the electrode material of the electrode assembly 13; on the other hand, it also optimizes the flow performance of the bottom gas channel, so that the gas generated by the electrode assembly 13 can flow smoothly from the hollow area 122 to the mounting hole 111, ensuring that the explosion-proof valve can open normally under thermal runaway conditions and achieve effective pressure relief.
[0056] Therefore, this application provides sufficient and stable support for the electrode assembly 13 through the cooperative design of the protrusion 112 and the recess 121, and the coordinated design with the hollow area 122 of the gasket 12. This ensures that there is sufficient space and channel between the electrode assembly 13 and the explosion-proof valve, and the alignment of the explosion-proof valve is not affected by the assembly, transportation or use of the electrode assembly 13. This achieves precise matching between the explosion-proof valve and the hollow area 122 of the gasket 12. If the battery cell 10 is overcharged and thermally runaway, the large amount of gas generated by the electrode assembly 13 can be released by opening the bottom explosion-proof valve through the hollow area 122, thus avoiding overcharge thermal runaway failure caused by the cracking of the top cover weld due to the blockage of the bottom explosion-proof valve.
[0057] Please see Figure 3 and Figure 4 In one embodiment of this application, the protrusion 112 and the recess 121 are in an interference fit.
[0058] With this design, when the gasket 12 is installed inside the housing body 11, the protrusion 112 on the housing body 11 and the recess 121 on the gasket 12 are made to fit together with an interference fit. This allows the gasket 12 to form a more stable combination and fixation with the housing body 11. This not only enables the gasket 12 to provide a solid support for the electrode assembly 13, but also fully restricts the slippage of the gasket 12 during the assembly, transportation or use of the electrode assembly 13.
[0059] Please see Figures 3 to 7 In one embodiment of this application, there are multiple protrusions 112 and multiple recesses 121. Each corner of the shell body 11 is provided with at least one protrusion 112, and each corner of the gasket 12 is provided with at least one recess 121. The multiple protrusions 112 and the multiple recesses 121 are matched one by one.
[0060] In this embodiment, the shell body 11 can be designed as a square shell with four corners, and each of the four corners of the shell body 11 has at least one protrusion 112. The gasket 12 can be designed as a square piece with four corners, and the four corners of the gasket 12 correspond one-to-one with the four corners of the shell body 11. Each of the four corners of the gasket 12 has at least one recess 121.
[0061] This design, with multiple protrusions 112 and multiple recesses 121 engaging one-to-one between the gasket 12 and the shell body 11, can further improve the positioning reliability between the gasket 12 and the shell body 11, so that the gasket 12 and the shell body 11 form a more stable combination and fixation. This not only enables the gasket 12 to provide a solid support for the electrode assembly 13, but also fully restricts the slippage of the gasket 12 during the assembly, transportation or use of the electrode assembly 13.
[0062] Please see Figures 3 to 5 In one embodiment of this application, the protrusion 112 and the shell body 11 are integrally formed.
[0063] This design, employing a one-piece molded structure, ensures the stability and reliability of the structure.
[0064] In some embodiments, the protrusion 112 on the shell body 11 can be integrally formed on the shell body 11 by a stretching process to form an integrally formed structural component.
[0065] Please see Figure 3 and Figure 4 In one embodiment of this application, the root peripheral wall of the protrusion 112 connected to the shell body 11 is provided with a rounded corner (not shown in the figure). The rounded corner abuts against the bottom surface of the gasket 12 so that a channel is formed between the bottom surface of the gasket 12 and the inner bottom surface of the shell body 11. The channel communicates with the mounting hole 111 and the hollow area 122.
[0066] This design, with its rounded corners, elevates the gasket 12, creating a channel between the bottom surface of the gasket 12 and the inner bottom surface of the shell body 11. This allows the electrolyte to diffuse not only from the perforated area 122 to the electrode material of the electrode assembly 13, but also from the channel, further ensuring the electrolyte's wetting path and improving the diffusion effect from the gasket 12 to the electrode material of the electrode assembly 13. Furthermore, it optimizes the flow performance of the bottom gas channel, allowing the gas generated by the electrode assembly 13 to flow not only from the perforated area 122 to the mounting hole 111, but also from the channel to the mounting hole 111, further ensuring that the explosion-proof valve can open normally under thermal runaway conditions, achieving effective pressure relief.
[0067] Please see Figure 3 and Figure 4 In one embodiment of this application, the top surface of the protrusion 112 is flush with the top surface of the pad 12.
[0068] In this embodiment, the recess 121 on the gasket 12 is an opening that penetrates the gasket 12. After the protrusion 112 on the shell body 11 is inserted into the recess 121, the top surface of the protrusion 112 is flush with the top surface of the gasket 12.
[0069] This design allows the protrusions 112 and the recesses 121 to provide more sufficient and stable support for the electrode assembly 13, ensuring that there is enough space and channel between the electrode assembly 13 and the explosion-proof valve, and that the alignment of the explosion-proof valve is not affected by the assembly, transportation or use of the electrode assembly 13, thus achieving a precise fit between the explosion-proof valve and the hollowed-out area 122 of the gasket 12.
[0070] Please see Figures 6 to 7 In one embodiment of this application, the hollow area 122 includes a first hollow hole 1221 and a second hollow hole 1222; the first hollow hole 1221 is located above the mounting hole 111 and communicates with the mounting hole 111; the second hollow hole 1222 is located on both sides of the first hollow hole 1221 and communicates with the first hollow hole 1221.
[0071] In this embodiment, the first hollow hole 1221 and the second hollow hole 1222 are both through holes that penetrate the gasket 12. The first hollow hole 1221 and the second hollow hole 1222 can be formed on the gasket 12 by cutting, or the gasket 12 with the first hollow hole 1221 and the second hollow hole 1222 can be directly formed in a mold.
[0072] This design, on the one hand, allows the electrolyte to diffuse from the first perforation 1221 and the second perforation 1222 to the electrode material of the electrode assembly 13, further ensuring the wetting path of the electrolyte and improving the diffusion effect of the electrolyte from the gasket 12 to the electrode material of the electrode assembly 13; on the other hand, it also optimizes the flow performance of the bottom gas channel, allowing the gas generated by the electrode assembly 13 to flow from the first perforation 1221 and the second perforation 1222 to the mounting hole 111, further ensuring that the explosion-proof valve can open normally under thermal runaway conditions and achieve effective pressure relief.
[0073] Please see Figures 6 to 7 In one embodiment of this application, a plurality of second hollow holes 1222 are provided on both sides of the first hollow hole 1221. The plurality of second hollow holes 1222 located on the same side of the first hollow hole 1221 are distributed at intervals along the first direction a. The second hollow holes 1222 extend along the second direction b. The first direction a and the second direction b are arranged at an angle.
[0074] In this embodiment, among the plurality of second hollow holes 1222 located on the same side of the first hollow hole 1221, there is a support piece between two adjacent second hollow holes 1222, so as to use the support piece to stably support the electrode assembly 13.
[0075] This design increases the distribution area of the second perforated hole 1222, which on the one hand increases the wetting path of the electrolyte and further improves the diffusion effect of the electrolyte from the gasket 12 to the electrode material of the electrode assembly 13; on the other hand, it also increases the flow path of the bottom gas channel, so that the gas generated by the electrode assembly 13 can flow from the first perforated hole 1221 and multiple second perforated holes 1222 to the mounting hole 111, further ensuring that the explosion-proof valve can open normally under thermal runaway conditions and achieve effective pressure relief.
[0076] In some embodiments, the first direction a and the second direction b can be the width direction and the length direction of the gasket 12, respectively.
[0077] Please see Figures 6 to 7 In one embodiment of this application, the first hollow hole 1221 has a center line, and the second hollow holes 1222 located on both sides of the first hollow hole 1221 are symmetrically distributed along the center line of the first hollow hole 1221.
[0078] This symmetrical design allows for more uniform diffusion of the electrolyte and more uniform gas flow.
[0079] This application also proposes a battery device 100, which includes a battery housing 20 and a battery cell 10. The specific structure of the battery cell 10 is as described in the above embodiments. Since this battery device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The battery cell 10 is disposed inside the battery housing 20.
[0080] This application also proposes an electrical device, which includes a battery device 100. The specific structure of the battery device 100 is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0081] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A battery cell, characterized by, Includes a housing and an electrode assembly disposed within the housing, the housing comprising: The shell body has a mounting hole at its bottom, which is configured to install an explosion-proof valve, and the electrode assembly is located inside the shell body. A gasket is disposed within the shell body and located between the inner bottom surface of the shell body and the electrode assembly; The inner bottom surface of the shell body has a protrusion, and the side of the gasket near the inner bottom surface of the shell body has a recess, with the protrusion and the recess providing a limiting fit; the gasket also has a hollow area, which communicates with the mounting hole.
2. The battery cell of claim 1, wherein, The protrusion and the recess are interference-fitted.
3. The battery cell of claim 2, wherein, The protrusions and recesses are provided in multiples. Each corner of the shell body is provided with at least one protrusion, and each corner of the gasket is provided with at least one recess. The multiple protrusions and the multiple recesses are matched one by one.
4. The battery cell according to any one of claims 1 to 3, wherein The protrusion is integrally formed with the shell body.
5. The battery cell of any one of claims 1 to 3, wherein, The root peripheral wall of the protrusion connected to the shell body has a rounded corner, which abuts against the bottom surface of the gasket, so that a channel is formed between the bottom surface of the gasket and the inner bottom surface of the shell body, and the channel communicates with the mounting hole and the hollow area.
6. The battery cell of any one of claims 1 to 3, wherein, The top surface of the protrusion is flush with the top surface of the gasket.
7. The battery cell of any one of claims 1 to 3, wherein, The hollowed-out area includes: The first perforated hole is located above the mounting hole and communicates with the mounting hole; The second perforated hole is located on both sides of the first perforated hole and is connected to the first perforated hole.
8. The battery cell as described in claim 7, characterized in that, Multiple second hollow holes are provided on both sides of the first hollow hole. Multiple second hollow holes located on the same side of the first hollow hole are distributed at intervals along the first direction. The second hollow holes extend along the second direction. The first direction and the second direction are set at an angle.
9. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. The first perforated hole has a center line, and the second perforated holes located on both sides of the first perforated hole are symmetrically distributed along the center line of the first perforated hole.
10. A battery device characterized by comprising: It includes a battery housing and a battery cell as described in any one of claims 1 to 9 disposed within the battery housing.
11. An electrical device, characterized by Includes the battery device as described in claim 10.