Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a single battery, a battery device and electric equipment, the single battery comprises an anti-explosion valve, the anti-explosion valve comprises a valve plate, at least part of the valve plate is recessed along a first direction to form a blasting nick and a reinforcing groove, and the first direction is the thickness direction of the valve plate; wherein the blasting nick is provided with a first side wall, the reinforcing groove is provided with a second side wall, the first side wall and the second side wall are obliquely arranged relative to the first direction, and the included angle between the first side wall and the first direction is smaller than the included angle between the second side wall and the first direction. The battery device comprises the battery monomer. The electric equipment comprises the battery device. According to the battery monomer, the battery device and the electric equipment, when the battery monomer is subjected to thermal runaway, the stress concentration degree of the blasting nick is greater than that of the reinforcing groove, the valve plate can preferentially crack from the blasting nick, and the rib of the reinforcing groove is not cracked, so that thermal runaway gas in the battery monomer is smoothly and timely discharged.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery cell, a battery device and electrical equipment. Background Art

[0002] Lithium-ion batteries are currently widely used in electric vehicles, consumer electronics, and other fields due to their high energy density and long service life. Explosion-proof valves play a crucial role in battery safety. In the event of thermal runaway, such as short circuits, overcharging, or overheating, the valve senses changes in internal battery pressure and opens promptly to release air and pressure, preventing the risk of explosion or fire.

[0003] In some embodiments, the explosion-proof valve has a bursting notch, and some explosion-proof valves cannot be adapted to the battery process. When thermal runaway occurs, the bursting notch of the explosion-proof valve cannot crack, resulting in the explosion-proof valve being unable to open accurately and the thermal runaway gas inside the battery being unable to be discharged in time. Utility Model Content

[0004] Based on this, it is necessary to provide a battery cell, battery device and electrical equipment to address the problem that the existing explosion-proof valve cannot be opened accurately during thermal runaway, which may lead to the inability to discharge the thermal runaway gas in time.

[0005] A battery cell includes an explosion-proof valve, the explosion-proof valve including a valve plate, at least a portion of which is recessed along a first direction to form a bursting notch and a reinforcement groove, the first direction being the thickness direction of the valve plate; wherein the bursting notch has a first sidewall, and the reinforcement groove has a second sidewall, the first sidewall and the second sidewall are both inclined relative to the first direction, and the angle between the first sidewall and the first direction is smaller than the angle between the second sidewall and the first direction. In the above-mentioned battery cell, the angle between the first sidewall and the first direction is smaller than the angle between the second sidewall and the first direction. When thermal runaway occurs in the battery cell, the bursting notch has a greater stress concentration than the reinforcement groove. The valve plate can preferentially crack at the bursting notch, while the reinforcement groove ribs do not crack, thereby ensuring sufficient exhaust area for the explosion-proof valve. At the same time, the reinforcement groove can enhance the structural strength of the valve plate, allowing thermal runaway gases within the battery cell to be discharged smoothly and promptly.

[0006] In some embodiments, the angle q between the first sidewall and the first direction is defined as "q," the angle w between the second sidewall and the first direction is defined as "w," and the difference between w and q is within a range of 10° to 30°. By limiting the difference between w and q, the bursting notch can be more stress-concentrated than the reinforcing groove, allowing the valve disc to preferentially crack at the bursting notch while preventing cracking at the reinforcing groove ribs.

[0007] In some embodiments, the difference between w and q ranges from 15° to 25°. Thus, by limiting the difference between w and q to the optimal range, the valve plate can be cracked smoothly from the bursting notch without cracking at the reinforcement groove rib.

[0008] In some embodiments, the angle q between the first sidewall and the first direction ranges from 0° to 50°. By limiting the angle range between the first sidewall and the first direction, the stress concentration at the bursting notch can be minimized, and the valve disc can preferentially crack at the bursting notch in the event of thermal runaway.

[0009] In some embodiments, the angle q between the first sidewall and the first direction is in the range of 10° to 40°. Thus, the angle between the first sidewall and the first direction is in the optimal range, and the valve disc can smoothly rupture from the rupture notch when thermal runaway occurs.

[0010] In some embodiments, the angle w between the second sidewall and the first direction ranges from 10° to 70°. By limiting the angle range between the second sidewall and the second direction, the stress concentration in the reinforcement groove can be kept from being too small or too large, and the reinforcement groove ribs will not crack in the event of thermal runaway.

[0011] In some embodiments, the angle w between the second sidewall and the first direction is in the range of 30° to 60°. This ensures that the angle w between the second sidewall and the first direction is within the optimal range, preventing the reinforcement groove ribs from cracking in the event of thermal runaway, thereby enabling the reinforcement groove to enhance the structural strength of the valve plate.

[0012] In some embodiments, the bursting notch further comprises a first bottom wall connected to the first side wall, and the reinforcing groove further comprises a second bottom wall connected to the second side wall; the chamfer between the first bottom wall and the first side wall is smaller than the chamfer between the second bottom wall and the second side wall. Thus, when thermal runaway of the battery cell occurs, stress concentration is greater in the bursting notch than in the reinforcing groove. The valve plate can preferentially crack at the bursting notch, while the reinforcing groove ribs do not crack, thereby ensuring sufficient venting area for the explosion-proof valve. Furthermore, the reinforcing groove can enhance the structural strength of the valve plate.

[0013] In some embodiments, the chamfer radius between the first bottom wall and the first side wall is a, the chamfer radius between the second bottom wall and the second side wall is b, and the ratio of b to a ranges from 1.2 to 2.5. By limiting the ratio of b to a, the stress concentration in the bursting notch can be greater than that in the reinforcing groove, allowing the valve disc to crack preferentially at the bursting notch while preventing cracking at the reinforcing groove rib.

[0014] In some embodiments, the ratio of b to a ranges from 1.5 to 2. Thus, by limiting the ratio of b to a to an optimal range, the valve disc can be cracked smoothly from the bursting notch without cracking at the reinforcement groove rib.

[0015] In some embodiments, the chamfer radius a between the first bottom wall and the first side wall is in the range of 0.01 mm to 0.05 mm. By limiting the chamfer radius between the first bottom wall and the first side wall, the stress concentration at the bursting notch can be minimized, and the valve disc can preferentially crack at the bursting notch in the event of thermal runaway.

[0016] In some embodiments, the chamfer radius a between the first bottom wall and the first side wall is in the range of 0.02 mm to 0.04 mm. Thus, the chamfer radius between the first bottom wall and the first side wall is within the optimal range, and the valve disc can smoothly rupture from the rupture notch in the event of thermal runaway.

[0017] In some embodiments, the chamfer radius b between the second bottom wall and the second side wall is in the range of 0.012 mm to 0.125 mm. By limiting the chamfer radius range between the second bottom wall and the second side wall, the stress concentration in the reinforcement groove is prevented from being too small or too large, and the reinforcement groove ribs are prevented from cracking in the event of thermal runaway.

[0018] In some embodiments, the chamfer radius b between the second bottom wall and the second side wall is in the range of 0.03 mm to 0.08 mm. This ensures that the chamfer radius between the second bottom wall and the second side wall is within the optimal range, preventing the reinforcement groove rib from cracking in the event of thermal runaway, thereby enabling the reinforcement groove to enhance the structural strength of the valve plate.

[0019] In some embodiments, the wall thickness of the bursting notch is thinner than that of the reinforcing groove. This allows the valve plate to preferentially crack at the bursting notch when thermal runaway occurs, while the ribs in the reinforcing groove remain intact. This ensures sufficient venting area for the explosion-proof valve. Furthermore, the reinforcing groove enhances the structural strength of the valve plate.

[0020] In some embodiments, the wall thickness of the bursting notch is d, the wall thickness of the reinforcing groove is h, and the ratio of h to d ranges from 1.8 to 3. By limiting the range of the ratio of h to d, the bursting notch can be made to have a greater stress concentration than the reinforcing groove, allowing the valve disc to crack preferentially at the bursting notch while preventing cracking at the reinforcing groove ribs.

[0021] In some embodiments, the ratio of h to d is in the range of 2 to 2.5. Thus, by limiting the ratio of h to d to the optimal range, the valve plate can be cracked smoothly from the bursting notch without cracking at the reinforcement groove rib.

[0022] In some embodiments, the wall thickness d of the bursting notch is in the range of 0.05 mm to 0.3 mm. By limiting the wall thickness range of the bursting notch, the stress concentration at the bursting notch can be kept within a certain range, and the valve disc can preferentially crack at the bursting notch in the event of thermal runaway.

[0023] In some embodiments, the wall thickness d of the bursting notch is in the range of 0.1 mm to 0.2 mm. In this way, the wall thickness of the bursting notch is in the optimal range, and the valve disc can smoothly crack from the bursting notch when thermal runaway occurs.

[0024] In some embodiments, the wall thickness h of the reinforcement groove ranges from 0.09 mm to 0.9 mm. By limiting the wall thickness range of the reinforcement groove, the stress concentration in the reinforcement groove is prevented from being too small or too large, and the reinforcement groove ribs are prevented from cracking in the event of thermal runaway.

[0025] In some embodiments, the wall thickness h of the reinforcement groove is in the range of 0.2 mm to 0.5 mm. In this way, the wall thickness of the reinforcement groove is in the optimal range, and the reinforcement groove ribs do not crack when thermal runaway occurs, so that the reinforcement groove can enhance the structural strength of the valve plate.

[0026] A battery device includes the aforementioned battery cell. In the event of thermal runaway, the bursting notch creates a greater stress concentration than the reinforcing groove. The valve plate preferentially cracks at the bursting notch, while the reinforcing groove ribs remain intact. This provides the explosion-proof valve with sufficient venting area. Furthermore, the reinforcing groove enhances the structural strength of the valve plate, allowing for smooth and timely discharge of thermal runaway gases within the battery cell.

[0027] An electrical device includes the battery device described above. The explosion-proof valve of the electrical device has sufficient exhaust area, and the reinforced groove can enhance the structural strength of the valve plate, allowing thermal runaway gas inside the battery cell to be discharged smoothly and promptly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of electrical equipment in some embodiments of the present application.

[0029] Figure 2 Schematic diagram of a battery device in some embodiments of the present application.

[0030] Figure 3 This is an exploded view of a battery cell in some embodiments of the present application.

[0031] Figure 4 This is an axonometric view of a battery cell in some embodiments of the present application.

[0032] Figure 5 for Figure 4 A top view of the valve plate in the battery cell is shown.

[0033] Figure 6 for Figure 5 AA section view of the valve plate shown.

[0034] Figure 7 for Figure 6 A partial enlarged view of point B of the valve plate is shown.

[0035] Figure 8 for Figure 6 A partial enlarged view of point C of the valve plate is shown.

[0036] Reference numerals:

[0037] 10. Vehicle; 11. Controller; 12. Motor; 20. Battery device; 21. Housing; 21a. First portion; 21b. Second portion; 22. Battery cell; 23. End cap; 24. Housing; 25. Electrode assembly; 100. Explosion-proof valve; 101. Valve plate; 110. Burst notch; 111. First side wall; 112. First bottom wall; 120. Reinforcement groove; 121. Second side wall; 122. Second bottom wall. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

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

[0042] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0046] Lithium-ion batteries are currently widely used in electric vehicles, consumer electronics, and other fields due to their high energy density and long service life. Explosion-proof valves play a crucial role in battery safety. In the event of thermal runaway, such as short circuits, overcharging, or overheating, the valve senses changes in internal battery pressure and opens promptly to release air and pressure, preventing the risk of explosion or fire.

[0047] In some embodiments, the explosion-proof valve has a bursting notch, and some explosion-proof valves cannot be adapted to the battery process. When thermal runaway occurs, the bursting notch of the explosion-proof valve cannot crack, resulting in the explosion-proof valve being unable to open accurately and the thermal runaway gas inside the battery being unable to be discharged in time.

[0048] Based on the above considerations, a battery cell, a battery device and an electrical equipment are designed. In the battery cell, the angle between the first side wall and the first direction is smaller than the angle between the second side wall and the first direction. When thermal runaway occurs in the battery cell, the stress concentration degree of the bursting notch is greater than that of the reinforced groove. The valve plate can preferentially crack from the bursting notch, and the reinforced groove ribs do not crack, so that the explosion-proof valve has sufficient exhaust area. At the same time, the reinforced groove can enhance the structural strength of the valve plate, allowing the thermal runaway gas inside the battery cell to be discharged smoothly and timely.

[0049] The present invention provides an electrical device that uses a battery device as a power source. The electrical device may include, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, and the like. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0050] For the convenience of description, the following embodiments are described by taking a vehicle 10 as an example of an electrical device according to an embodiment of the present application.

[0051] Please refer to Figure 1 The vehicle 10 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery device 20 is provided inside the vehicle 10. The battery device 20 may be provided at the bottom, head, or tail of the vehicle 10. The battery device 20 may be used to power the vehicle 10. For example, the battery device 20 may serve as an operating power source for the vehicle 10. The vehicle 10 may further include a controller 11 and a motor 12. The controller 11 is used to control the battery device 20 to power the motor 12, for example, to meet the power requirements for starting, navigating, and driving the vehicle 10.

[0052] In some embodiments of the present application, the battery device 20 can serve not only as an operating power source for the vehicle 10 , but also as a driving power source for the vehicle 10 , replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 10 .

[0053] Please refer to Figure 2The battery device 20 includes a housing 21 and a battery cell 22, with the battery cell 22 housed within the housing 21. The housing 21 is used to provide a storage space for the battery cell 22 and can have various structures. The housing 21 includes a first portion 21a and a second portion 21b, which overlap each other and together define a storage space for the battery cell 22. The second portion 21b can be a hollow structure with one end open. The first portion 21a can be a plate-like structure, with the first portion 21a overlapping the open side of the second portion 21b, so that the first portion 21a and the second portion 21b together define a storage space. The first portion 21a and the second portion 21b can also be hollow structures with one end open, with the open side of the first portion 21a overlapping the open side of the second portion 21b. Of course, the housing formed by the first portion 21a and the second portion 21b can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0054] In the battery device 20, there may be multiple battery cells 22, and the multiple battery cells 22 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to the multiple battery cells 22 being connected both in series and in parallel. The multiple battery cells 22 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 22 may be contained within a housing. Of course, the battery device 20 may also be a battery module formed by first connecting multiple battery cells 22 in series, in parallel, or in a hybrid connection, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery unit, which is then contained within a housing. The battery device 20 may also include other structures, for example, the battery device 20 may also include a busbar component for electrically connecting the multiple battery cells 22.

[0055] Each battery cell 22 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 may be cylindrical, flat, rectangular, or in other shapes.

[0056] The following describes in detail any battery cell 22. Figure 3 As shown, the battery cell 22 includes an end cap 23 , a housing 24 and an electrode assembly 25 .

[0057] The end cap 23 is a component that covers the opening of the housing 24 to isolate the internal environment of the battery cell 22 from the external environment. The shape of the end cap 23 can be adapted to the shape of the housing 24 to fit the housing 24. Optionally, the end cap 23 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 23 from deforming under pressure or collision, thereby enhancing the structural strength and safety of the battery cell 22. The end cap 23 can be provided with functional components such as electrode terminals. The electrode terminals are used to electrically connect to the battery cell assembly 23 to transfer electrical energy to or from the battery cell 22. In some embodiments, the end cap 23 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 22 reaches a threshold. The end cap 23 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiment. In some embodiments, an insulating member may be provided inside the end cap 23 to isolate the electrical connection components in the housing 24 from the end cap 23 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0058] The housing 24 is a component that cooperates with the end cap 23 to form an internal environment for the battery cell 22. This internal environment can accommodate the battery cell assembly 23, electrolyte, and other components. The housing 24 and end cap 23 can be separate components. An opening can be provided in the housing 24, and the end cap 23 is placed over the opening to form the internal environment of the battery cell 22. Alternatively, the end cap 23 and housing 24 can be integrated. Specifically, the end cap 23 and housing 24 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 24 needs to be enclosed, the end cap 23 is placed over the housing 24. The housing 24 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 24 can be determined based on the specific shape and size of the battery cell assembly 23. The housing 24 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0059] The electrode assembly 25 is a component in the battery cell 22 where electrochemical reactions occur. One or more electrode assemblies 25 may be contained in the housing 23. The electrode assembly 25 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tab. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0060] Please refer to Figures 4 to 8 In one embodiment, the battery cell 22 includes an explosion-proof valve 100, which includes a valve plate 101. At least a portion of the valve plate 101 is recessed along a first direction to form a bursting notch 110 and a reinforcement groove 120. The first direction is the thickness direction of the valve plate 101. The bursting notch 110 has a first side wall 111, and the reinforcement groove 120 has a second side wall 121. The first side wall 111 and the second side wall 121 are both inclined relative to the first direction, and the angle between the first side wall 111 and the first direction is smaller than the angle between the second side wall 121 and the first direction.

[0061] It should be noted that the first direction is the thickness direction of the valve plate 101, that is, Figure 6 Z direction shown.

[0062] In the embodiment of the present application, the explosion-proof valve 100 is configured to open when a battery cell 22 experiences thermal runaway, thereby releasing the thermal runaway gas inside the battery cell 22. Optionally, the explosion-proof valve 100 can be provided on the end cap 23 of the battery cell 22, or on the housing 24 of the battery cell 22.

[0063] In the embodiment of the present application, the valve disc 101 is a sheet-like structure used to guide the direction of the ejected airflow when the explosion-proof valve 100 is opened. Optionally, the valve disc 101 is a thin sheet formed by stamping a metal sheet, and the bursting notch 110 and the reinforcement groove 120 are both formed on the surface of the valve disc 101 by stamping.

[0064] In the embodiment of the present application, the bursting score 110 is arranged around the outer periphery of the valve plate 101, so that the explosion-proof valve 100 has sufficient exhaust area when it is opened along the bursting score 110. Optionally, the bursting score 110 is a closed annular structure.

[0065] In the embodiment of the present application, the reinforcement groove 120 is provided in the middle of the valve disc 101. The reinforcement groove 120 can be provided on one side of the valve disc 101 along its thickness direction, or on both sides along its thickness direction. Optionally, the reinforcement groove 120 can be arc-shaped, linear, or other shapes.

[0066] In the above-mentioned battery cell 22, the angle between the first side wall 111 and the first direction is smaller than the angle between the second side wall 121 and the first direction. When thermal runaway occurs in the battery cell 22, the stress concentration degree of the bursting notch 110 is greater than that of the reinforcing groove 120. The valve plate 101 can preferentially crack from the bursting notch 110, and the ribs of the reinforcing groove 120 will not crack, so that the explosion-proof valve 101 has sufficient exhaust area. At the same time, the reinforcing groove 120 can enhance the structural strength of the valve plate 101, allowing the thermal runaway gas inside the battery cell 22 to be discharged smoothly and timely.

[0067] According to some embodiments of this application, please refer to Figure 7 and Figure 8 The angle between the first side wall 111 and the first direction is q, the angle between the second side wall 121 and the first direction is w, and the difference between w and q ranges from 10° to 30°.

[0068] In the embodiment of the present application, the angle q between the first side wall 111 and the first direction, that is, the inclination of the first side wall 111 relative to the vertical direction, is larger, the inclination of the first side wall 111 is greater, and the stress concentration of the blasting mark 110 is smaller.

[0069] In the embodiment of the present application, the angle w between the second side wall 121 and the second direction, that is, the inclination of the second side wall 121 relative to the vertical direction, is larger, the inclination of the second side wall 121 is greater, and the stress concentration of the reinforcement groove 120 is smaller.

[0070] With the above arrangement, by limiting the difference range between w and q, the stress concentration degree of the bursting notch 110 can be greater than that of the reinforcing groove 120 , so that the valve plate 101 can preferentially crack from the bursting notch 110 without cracking at the ribs of the reinforcing groove 120 .

[0071] According to some embodiments of this application, please refer to Figure 7 and Figure 8 , the difference between w and q ranges from 15° to 25°.

[0072] It should be noted that the greater the difference between w and q, the greater the stress concentration of blasting score 110 compared to reinforcement groove 120, and the easier it is for blasting score 110 to crack; the smaller the difference between w and q, the smaller the stress concentration of blasting score 110 compared to reinforcement groove 120, and the less likely it is for blasting score 110 to crack.

[0073] Through the above arrangement, by limiting the difference between w and q to an optimal range, the valve plate 101 can be cracked smoothly from the bursting notch 110 , and the ribs of the reinforcing groove 120 are not cracked.

[0074] According to some embodiments of this application, please refer to Figure 7 The angle q between the first side wall 111 and the first direction ranges from 0° to 50°.

[0075] In the embodiment of the present application, the angle q between the first side wall 111 and the first direction, that is, the inclination of the first side wall 111 relative to the vertical direction, is larger, the inclination of the first side wall 111 is greater, and the stress concentration of the blasting mark 110 is smaller.

[0076] With the above arrangement, by limiting the angle range between the first side wall 111 and the first direction, the stress concentration degree of the bursting notch 110 will not be too small or too large, and the valve plate 101 can preferentially crack from the bursting notch 110 when thermal runaway occurs.

[0077] According to some embodiments of this application, please refer to Figure 7 The angle q between the first side wall 111 and the first direction ranges from 10° to 40°.

[0078] Through the above arrangement, the angle between the first side wall 111 and the first direction is in the optimal range, and the valve plate 101 can smoothly crack from the bursting mark 110 when thermal runaway occurs.

[0079] According to some embodiments of this application, please refer to Figure 8 The angle w between the second side wall 121 and the first direction ranges from 10° to 70°.

[0080] In the embodiment of the present application, the angle w between the second side wall 121 and the second direction, that is, the inclination of the second side wall 121 relative to the vertical direction, is larger, the inclination of the second side wall 121 is greater, and the stress concentration of the reinforcement groove 120 is smaller.

[0081] Through the above arrangement, by limiting the angle range between the second side wall 121 and the second direction, the stress concentration degree of the reinforcing groove 120 will not be too small or too large, and the ribs of the reinforcing groove 120 will not crack when thermal runaway occurs.

[0082] According to some embodiments of this application, please refer to Figure 8 The angle w between the second side wall 121 and the first direction ranges from 30° to 60°.

[0083] Through the above arrangement, the angle between the second side wall 121 and the first direction is in the optimal range, and the ribs of the reinforcing groove 120 do not crack when thermal runaway occurs, so that the reinforcing groove 120 can enhance the structural strength of the valve plate 101.

[0084] According to some embodiments of this application, please refer to Figures 6 to 8 The blasting notch 110 further includes a first bottom wall 112 connected to the first side wall 111 , and the reinforcement groove 120 further includes a second bottom wall 122 connected to the second side wall 121 ; the chamfer between the first bottom wall 112 and the first side wall 111 is smaller than the chamfer between the second bottom wall 122 and the second side wall 121 .

[0085] It should be noted that the chamfer between the first bottom wall 112 and the first side wall 111, i.e., the angle at the intersection of the first bottom wall 112 and the first side wall 111, is the result of chamfering. The larger the chamfer between the first bottom wall 112 and the first side wall 111, the greater the inclination of the first side wall 111, and the lower the stress concentration in the blasting notch 110.

[0086] It should be further explained that the chamfer between the second bottom wall 122 and the second side wall 121, i.e., the angle at the intersection of the second bottom wall 122 and the second side wall 121, is the result of a chamfering process. The larger the chamfer between the second bottom wall 122 and the second side wall 121, the greater the inclination of the second side wall 121, and the lower the stress concentration in the blasting notch 110.

[0087] In the embodiment of the present application, the first sidewall 111 is connected to the end of the first bottom wall 112 and extends upward from the end of the first bottom wall 112, so that the blasting notch 110 has a concave structure. The first sidewall 111 is respectively provided at both ends of the first bottom wall 112, and the two first sidewalls 111 are symmetrically distributed along the first direction.

[0088] In the embodiment of the present application, the second sidewall 121 is connected to the end of the second bottom wall 122 and extends upward from the end of the second bottom wall 122, so that the blasting mark 110 has a concave structure. A second sidewall 121 is provided at each end of the second bottom wall 122, and the two second sidewalls 121 are symmetrically distributed along the first direction.

[0089] Through the above arrangement, the chamfer between the first bottom wall 112 and the first side wall 111 is smaller than the chamfer between the second bottom wall 122 and the second side wall 121. When thermal runaway occurs in the battery cell 22, the stress concentration degree of the bursting notch 110 is greater than that of the reinforcing groove 120. The valve plate 101 can preferentially crack from the bursting notch 110, and the ribs of the reinforcing groove 120 will not crack, so that the explosion-proof valve 101 has sufficient exhaust area. At the same time, the reinforcing groove 120 can enhance the structural strength of the valve plate 101.

[0090] According to some embodiments of this application, please refer to Figure 7 and Figure 8 The chamfer radius between the first bottom wall 112 and the first side wall 111 is a, the chamfer radius between the second bottom wall 122 and the second side wall 121 is b, and the ratio of b to a ranges from 1.2 to 2.5.

[0091] It should be noted that the chamfer between the first bottom wall 112 and the first side wall 111 and the chamfer between the second bottom wall 122 and the second side wall 121 are both arc chamfers, and the chamfer radius refers to the radius of the arc chamfer curve.

[0092] With the above arrangement, by limiting the ratio range of b to a, the stress concentration degree of the bursting notch 110 can be greater than that of the reinforcing groove 120 , so that the valve plate 101 can be cracked preferentially at the bursting notch 110 , and the ribs of the reinforcing groove 120 will not be cracked.

[0093] According to some embodiments of this application, please refer to Figure 7 and Figure 8 , the ratio of b to a ranges from 1.5 to 2.

[0094] Through the above arrangement, by limiting the ratio of b to a within the optimal range, the valve plate 101 can be cracked smoothly from the bursting notch 110 , and the ribs of the reinforcement groove 120 will not be cracked.

[0095] According to some embodiments of this application, please refer to Figure 7 The chamfer radius a between the first bottom wall 112 and the first side wall 111 ranges from 0.01 mm to 0.05 mm.

[0096] In the embodiment of the present application, first sidewall 111 is connected to the end of first bottom wall 112 and extends upward from the end of first bottom wall 112, so that blasting score 110 has a concave structure. The chamfer between first bottom wall 112 and first sidewall 111, i.e., the angle at the intersection of first bottom wall 112 and first sidewall 111, is chamfered. The larger the chamfer between first bottom wall 112 and first sidewall 111, the greater the inclination of first sidewall 111, and the less stress concentration in blasting score 110.

[0097] Through the above arrangement, by limiting the chamfer radius range between the first bottom wall 112 and the first side wall 111, the stress concentration degree of the bursting notch 110 will not be too small or too large, and the valve plate 101 can preferentially crack from the bursting notch 110 when thermal runaway occurs.

[0098] According to some embodiments of this application, please refer to Figure 7 The chamfer radius a between the first bottom wall 112 and the first side wall 111 ranges from 0.02 mm to 0.04 mm.

[0099] Through the above arrangement, the chamfer radius between the first bottom wall 112 and the first side wall 111 is in the optimal range, and the valve plate 101 can smoothly crack from the bursting mark 110 when thermal runaway occurs.

[0100] According to some embodiments of this application, please refer to Figure 8 The chamfer radius b between the second bottom wall 122 and the second side wall 121 ranges from 0.012 mm to 0.125 mm.

[0101] In the embodiment of the present application, the second sidewall 121 is connected to the end of the second bottom wall 122 and extends upward from the end of the second bottom wall 122, so that the blasting score 110 has a concave structure. The chamfer between the second bottom wall 122 and the second sidewall 121, that is, the angle at the intersection of the second bottom wall 122 and the second sidewall 121 is chamfered. The larger the chamfer between the second bottom wall 122 and the second sidewall 121, the greater the inclination of the second sidewall 121, and the less stress concentration in the blasting score 110.

[0102] Through the above arrangement, by limiting the chamfer radius range between the second bottom wall 122 and the second side wall 121 , the stress concentration degree of the reinforcement groove 120 can be prevented from being too small or too large, and the ribs of the reinforcement groove 120 will not crack when thermal runaway occurs.

[0103] According to some embodiments of this application, please refer to Figure 8 The chamfer radius b between the second bottom wall 122 and the second side wall 121 ranges from 0.03 mm to 0.08 mm.

[0104] Through the above arrangement, the chamfer radius between the second bottom wall 122 and the second side wall 121 is in the optimal range, and the ribs of the reinforcing groove 120 will not crack when thermal runaway occurs, so that the reinforcing groove 120 can enhance the structural strength of the valve plate 101.

[0105] According to some embodiments of this application, please refer to Figures 6 to 8 , the wall thickness of the blasting notch 110 is smaller than the wall thickness of the reinforcement groove 120 .

[0106] It should be noted that the wall thickness of the blasting score 110 is the thickness of the first bottom wall 112 of the blasting score 110 ; the wall thickness of the reinforcement groove 120 is the thickness of the reinforcement groove 120 , that is, the thickness of the second bottom wall 122 of the reinforcement groove 120 .

[0107] Through the above arrangement, when thermal runaway occurs in the battery cell 22, the stress concentration degree of the bursting notch 110 is greater than that of the reinforcing groove 120. The valve plate 101 can preferentially crack from the bursting notch 110, and the ribs of the reinforcing groove 120 will not crack, so that the explosion-proof valve 101 has sufficient exhaust area. At the same time, the reinforcing groove 120 can enhance the structural strength of the valve plate 101.

[0108] According to some embodiments of this application, please refer to Figures 6 to 8 The wall thickness of the blasting notch 110 is d, the wall thickness of the reinforcement groove 120 is h, and the ratio of h to d ranges from 1.8 to 3.

[0109] With the above arrangement, by limiting the ratio range of h to d, the stress concentration degree of the bursting notch 110 can be greater than that of the reinforcing groove 120 , so that the valve plate 101 can be cracked preferentially at the bursting notch 110 , and the ribs of the reinforcing groove 120 will not be cracked.

[0110] According to some embodiments of this application, please refer to Figure 7 and Figure 8 , the ratio of h to d ranges from 2 to 2.5.

[0111] Through the above arrangement, by limiting the ratio of h to d to an optimal range, the valve plate 101 can be cracked smoothly from the bursting notch 110 , and the ribs of the reinforcement groove 120 will not be cracked.

[0112] According to some embodiments of this application, please refer to Figure 7 The wall thickness d of the blasting notch 110 ranges from 0.05 mm to 0.3 mm.

[0113] In the embodiment of the present application, the first sidewall 111 is connected to the end of the first bottom wall 112, and the first sidewall 111 extends upward from the end of the first bottom wall 112, so that the blasting score 110 has a concave structure. The thicker the blasting score 110, the less stress concentration therein.

[0114] With the above arrangement, by limiting the wall thickness range of the bursting score 110 , the stress concentration degree of the bursting score 110 will not be too small or too large, and the valve plate 101 can preferentially crack from the bursting score 110 when thermal runaway occurs.

[0115] According to some embodiments of this application, please refer to Figure 7 The wall thickness d of the blasting notch 110 ranges from 0.1 mm to 0.2 mm.

[0116] Through the above arrangement, the wall thickness of the bursting notch 110 is within the optimal range, and the valve plate 101 can smoothly crack from the bursting notch 110 when thermal runaway occurs.

[0117] According to some embodiments of this application, please refer to Figure 8 The wall thickness h of the reinforcement groove 120 ranges from 0.09 mm to 0.9 mm.

[0118] In the embodiment of the present application, the second sidewall 121 is connected to the end of the second bottom wall 122, and the second sidewall 121 extends upward from the end of the second bottom wall 122, so that the reinforcement groove 120 has a concave structure. The thicker the wall of the reinforcement groove 120, the less stress concentration in the reinforcement groove 120.

[0119] Through the above arrangement, by limiting the wall thickness range of the reinforcing groove 120 , the stress concentration degree of the reinforcing groove 120 can be prevented from being too small or too large, and the ribs of the reinforcing groove 120 will not crack when thermal runaway occurs.

[0120] According to some embodiments of this application, please refer to Figure 8 The wall thickness h of the reinforcement groove 120 ranges from 0.2 mm to 0.5 mm.

[0121] Through the above arrangement, the wall thickness of the reinforcing groove 120 is in the optimal range, and the ribs of the reinforcing groove 120 do not crack when thermal runaway occurs, so that the reinforcing groove 120 can enhance the structural strength of the valve plate 101.

[0122] Please refer to Figure 2 In one embodiment, the battery device 20 includes the aforementioned battery cell 22 .

[0123] It should be noted that the battery device 20 further includes a box body 21 , and the battery cells 22 are accommodated in the box body 21 .

[0124] In the above-mentioned battery device 20, when thermal runaway occurs, the stress concentration degree of the bursting notch 110 is greater than that of the reinforcing groove 120. The valve plate 101 can preferentially crack from the bursting notch 110, and the ribs of the reinforcing groove 120 will not crack, so that the explosion-proof valve 100 has sufficient exhaust area. At the same time, the reinforcing groove 120 can enhance the structural strength of the valve plate 101, allowing the thermal runaway gas inside the battery cell 22 to be discharged smoothly and timely.

[0125] Please refer to Figure 1 In one embodiment, the electrical equipment includes the battery device 20 described above.

[0126] For the above-mentioned electrical equipment, the explosion-proof valve 100 has sufficient exhaust area, and the reinforced groove 120 can enhance the structural strength of the valve plate 101, so that the thermal runaway gas inside the battery cell 22 can be discharged smoothly and timely.

[0127] According to some embodiments of the present application, see Figures 3 to 8In one embodiment, the battery cell 22 includes an explosion-proof valve 100, which includes a valve plate 101. At least a portion of the valve plate 101 is recessed along a first direction to form a bursting notch 110 and a reinforcement groove 120. The first direction is the thickness direction of the valve plate 101. The bursting notch 110 has a first side wall 111 and a first bottom wall 112 connected to the first side wall 111. The reinforcement groove 120 has a second side wall 121 and a second bottom wall 122 connected to the second side wall 121. The first side wall 111 and the second side wall 121 are both inclined relative to the first direction.

[0128] The angle q between the first side wall 111 and the first direction is smaller than the angle w between the second side wall 121 and the first direction, and the difference between w and q ranges from 15° to 25°; the radius a between the first bottom wall 112 and the first side wall 111 is smaller than the chamfer radius b between the second bottom wall 122 and the second side wall 121, and the ratio of b to a ranges from 1.2 to 2.5; the wall thickness d of the blasting notch 110 is smaller than the wall thickness h of the reinforcement groove 120, and the ratio of h to d ranges from 1.8 to 3.

[0129] According to some embodiments of the present application, see Figure 2 In one embodiment, the battery device 20 includes the aforementioned battery cell 22 .

[0130] According to some embodiments of the present application, see Figure 1 In one embodiment, the electrical equipment includes the battery device 20 described above.

[0131] To study the impact of the difference between w and q on the battery cell 22, several comparative experiments were conducted to test and compare the relevant parameters of the battery cell 22. In Comparative Example 1, where wq is less than the minimum value, the internal holding time of the battery cell 22 during thermal runaway is too long, and the risk of the battery cell 22 exploding is high. In Comparative Example 2, where wq is greater than the maximum value, the battery cell 22 experiences too few burst notch fatigue failures during long-term use, indicating low reliability. Specific data are shown in Table 1:

[0132] Table 1

[0133]

[0134] To study the effect of the ratio b / a on the battery cell 22, several comparative experiments were conducted to test and compare the relevant parameters of the battery cell 22. In Comparative Example 1, where b / a was less than the minimum value, the battery cell 22 experienced excessively long internal holding times during thermal runaway, leading to a high risk of explosion. In Comparative Example 2, where b / a was greater than the maximum value, the battery cell 22 experienced too few burst notch fatigue failures during long-term use, indicating low reliability. Specific data is shown in Table 2.

[0135] Table 2

[0136]

[0137] To study the effect of the ratio of h to d on the battery cell 22, several comparative experiments were conducted to test and compare the relevant parameters of the battery cell 22. For Comparative Example 1, where h / d is less than the minimum value, the battery cell 22 experiences excessive internal holding time during thermal runaway, leading to a high risk of explosion. For Comparative Example 2, where h / d is greater than the maximum value, the battery cell 22 experiences too few burst notch fatigue failures during long-term use, indicating low reliability. Specific data is shown in Table 3.

[0138] Table 3

[0139]

[0140] In the above comparative experiment, the thermal runaway test method of the battery cell 22 is as follows:

[0141] Select the heating plate according to the size of the battery cell 22. The size of the heating plate should cover as much surface of the battery cell 22 as possible (coverage area ≥ 60%).

[0142] Before testing, charge the battery cell 22 to 100% SOC and ensure that the temperature of the battery cell 22 is 25±5°C;

[0143] Sensor Layout: 1) Temperature Sensing Wire Layout: Apply a layer of Teflon to the center of each of the two large surfaces of the battery cell 22, place the temperature sensing wire on top of the Teflon, and then apply another layer of Teflon. 2) Voltage Sampling Wire Layout: Apply a layer of Teflon to the positive and negative electrode terminals and the outer shell of the battery cell, place the voltage sampling wire on top of the Teflon, and then apply another layer of Teflon. 3) Air Pipe Layout: Drill a hole in the first wall of the battery cell's outer shell, insert the air pipe into the hole, seal it, and connect the air pipe to the air pressure sensor. 4) Connect the temperature sensing wire, voltage sampling wire, and air pressure sensor to a data acquisition device for real-time data collection and analysis. The data acquisition device has an acquisition frequency of ≤0.1s.

[0144] Assemble the fixture: Make sure the fixture completely covers the large surface of the battery cell 22 (the outer surface of the housing perpendicular to the width direction of the first wall). Clamp with a force of 3000N. Note that the arrangement order of the fixture, heating plate, and battery cell 22 is: fixture + heating plate + battery cell 22 + fixture.

[0145] Test: Turn on the data acquisition instrument to collect temperature, voltage, and air pressure data, then turn on the heating plate at a power of 500W to heat the battery cell 22 until the battery cell thermal runaway occurs.

[0146] Obtain the pressure holding time of the battery cell 22, determine the thermal runaway moment and the valve opening moment based on the temperature, voltage, and air pressure data collected by the data acquisition instrument, and obtain the pressure holding time of the battery cell 22 based on the formula: pressure holding time = valve opening moment - thermal runaway moment.

[0147] Thermal runaway criteria: a) The triggering object generates a voltage drop exceeding 25% of the initial voltage; b) The temperature at the detection point reaches the manufacturer's specified maximum operating temperature; c) The temperature rise rate dT / dt at the detection point is ≥ 1°C / s and persists for at least 3 seconds. Thermal runaway is determined when a) and c) or b) and c) occur, and the moment of thermal runaway is determined. Valve opening timing determination: When the air pressure drops by more than 25%, the valve is considered open. The moment the air pressure begins to drop is the valve opening moment. Both the valve opening moment and the thermal runaway moment can be obtained from the data logger.

[0148] Experimental method and steps for testing the cycle fatigue number of battery cells 22:

[0149] 1) Prepare a dedicated test fixture. Specifically, the fixture consists of three 10mm steel plates (the first, second, and third steel plates are arranged in sequence along the width direction Z of the wall, with the thickness directions of the first, second, and third steel plates all oriented along the width direction Z of the wall). The first and third steel plates are located at both ends of the fixture and fixed with bolts. The second steel plate is located between the first and third steel plates and is constrained by guide rails, so that it can only move translationally along its thickness direction.

[0150] 2) The battery cell 22 is installed between the first steel plate and the second steel plate (i.e., the battery cell 22 is placed between the first steel plate and the second steel plate along the width direction Z of the wall). A support structure is placed between the largest outer surface of one side of the battery cell 22 and the first steel plate, and between the largest outer surface of the other side of the battery cell 22 and the second steel plate (i.e., a support structure is placed on both sides of the battery cell 22 in the width direction of the wall). The support structure can be an insulation pad or a water-cooling plate (consistent with the material / structure between the battery cells 22 in the actual battery). The support structure can be compressed to provide expansion space for the battery cell 22 during the charge and discharge cycle aging process; the largest outer surface of one side of the battery cell 22 is in contact with the support structure, the first steel plate is in contact with the corresponding support structure, and the second steel plate is in contact with the corresponding support structure. A pressure sensor is provided between the second and third steel plates;

[0151] 3) Adjust the position of the second steel plate by adjusting the pre-tightening force of the bolts and observing the pressure sensor so that the initial extrusion force on the battery cell 22 is 2000N. Connect the two electrode terminals of the battery cell 22 to a dedicated battery charging and discharging device.

[0152] (4) Place the battery cell 22 and the fixture in a constant temperature environment of 25±2°C, and start the test after the battery cell 22 reaches temperature equilibrium;

[0153] (5) The test steps are to be carried out in accordance with Section 6.4 “Standard cycle life” of GBT31484-2015 Requirements and test methods for cycle life of power batteries for electric vehicles, and the test cycle end condition is changed to “stop the test until the blast mark 110 is damaged”.

[0154] Specifically, test according to the following steps:

[0155] a. Discharge to 2.8V with a current of 1I1 (A);

[0156] b. Leave it for no less than 30 minutes;

[0157] c. Charge in accordance with 6.1.1.3 of GBT31484-2015 Cycle Life Requirements and Test Methods for Power Batteries for Electric Vehicles;

[0158] d. Leave it aside for no less than 30 minutes;

[0159] e. Discharge to 2.8V with a current of 1I1 (A);

[0160] f. Repeat steps b to e until the blasting notch 110 is damaged, then stop the test.

[0161] That is, during the test process, the blasting mark 110 of the battery cell 22 is continuously observed until the blasting mark 110 is damaged and cracked, and the number of cycles is recorded as the cycle fatigue number of the battery cell 22. Among them, the more cycle fatigue numbers of the battery cell 22, the lower the probability of premature cracking of the pressure relief component of the battery cell 22 during long-term use, and the longer the service life. Therefore, the cycle fatigue number of the battery cell 22 can be used to reasonably predict the possibility of premature cracking of the pressure relief component of the battery cell 22 during use.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell (22), characterized in that: include: An explosion-proof valve (100) comprises a valve plate (101), wherein at least a portion of the valve plate (101) is recessed along a first direction to form a bursting notch (110) and a reinforcement groove (120), wherein the first direction is a thickness direction of the valve plate (101); The blasting notch (110) has a first side wall (111), and the reinforcing groove (120) has a second side wall (121). The first side wall (111) and the second side wall (121) are both inclined relative to the first direction, and the angle between the first side wall (111) and the first direction is smaller than the angle between the second side wall (121) and the first direction.

2. The battery cell (22) according to claim 1, characterized in that The angle between the first side wall (111) and the first direction is q, the angle between the second side wall (121) and the first direction is w, and the difference between w and q is in the range of 10° to 30°.

3. The battery cell (22) according to claim 2, characterized in that The difference between w and q ranges from 15° to 25°.

4. The battery cell (22) according to claim 2, characterized in that The value range of the angle q between the first side wall (111) and the first direction is 0°~50°.

5. The battery cell (22) according to claim 4, characterized in that The value range of the angle q between the first side wall (111) and the first direction is 10° to 40°.

6. The battery cell (22) according to claim 2, characterized in that The value range of the angle w between the second side wall (121) and the first direction is 10° to 70°.

7. The battery cell (22) according to claim 6, characterized in that The value range of the angle w between the second side wall (121) and the first direction is 30° to 60°.

8. The battery cell (22) according to claim 1, characterized in that The blasting notch (110) further comprises a first bottom wall (112) connected to the first side wall (111), and the reinforcing groove (120) further comprises a second bottom wall (122) connected to the second side wall (121); a chamfer radius between the first bottom wall (112) and the first side wall (111) is smaller than a chamfer radius between the second bottom wall (122) and the second side wall (121).

9. The battery cell (22) according to claim 8, characterized in that The chamfer radius between the first bottom wall (112) and the first side wall (111) is a, the chamfer radius between the second bottom wall (122) and the second side wall (121) is b, and the ratio of b to a ranges from 1.2 to 2.

5.

10. The battery cell (22) according to claim 9, characterized in that The ratio of b to a ranges from 1.5 to 2.

11. The battery cell (22) according to claim 9, characterized in that The chamfer radius a between the first bottom wall (112) and the first side wall (111) has a value range of 0.01 mm to 0.05 mm.

12. The battery cell (22) according to claim 11, characterized in that The chamfer radius a between the first bottom wall (112) and the first side wall (111) has a value range of 0.02 mm to 0.04 mm.

13. The battery cell (22) according to claim 9, characterized in that The value range of the chamfer radius b between the second bottom wall (122) and the second side wall (121) is 0.012 mm to 0.125 mm.

14. The battery cell (22) according to claim 13, characterized in that The value range of the chamfer radius b between the second bottom wall (122) and the second side wall (121) is 0.03 mm to 0.08 mm.

15. The battery cell (22) according to claim 1, characterized in that The wall thickness of the blasting notch (110) is smaller than the wall thickness of the reinforcement groove (120).

16. The battery cell (22) according to claim 15, characterized in that The wall thickness of the blasting notch (110) is d, the wall thickness of the reinforcement groove (120) is h, and the ratio of h to d ranges from 1.8 to 3.

17. The battery cell (22) according to claim 16, characterized in that The ratio of h to d ranges from 2 to 2.

5.

18. The battery cell (22) according to claim 17, characterized in that The wall thickness d of the blasting notch (110) ranges from 0.05 mm to 0.3 mm.

19. The battery cell (22) according to claim 18, characterized in that The wall thickness d of the blasting notch (110) ranges from 0.1 mm to 0.2 mm.

20. The battery cell (22) according to claim 16, characterized in that The wall thickness h of the reinforcement groove (120) has a value range of 0.09 mm to 0.9 mm.

21. The battery cell (22) according to claim 20, characterized in that The wall thickness h of the reinforcement groove (120) ranges from 0.2 mm to 0.5 mm.

22. A battery device (20), characterized in that Comprising a battery cell (22) as claimed in any one of claims 1 to 21.

23. An electrical device, characterized in that: Comprising a battery device (20) as claimed in claim 22.

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