Pressure relief component, battery cell, battery and electric equipment

Abstract

The embodiment of the invention provides a pressure relief component, a battery monomer, a battery and electric equipment, the pressure relief component is provided with a nick groove, the nick groove extends along a closed track and defines a pressure relief area, the nick groove comprises a first groove section and a second groove section, the first groove section and the second groove section are arc line sections, and the first groove section and the second groove section are arc line sections. The extension of the first groove section and the second groove section is smooth, and a stress concentration point is not easy to form, so that the possibility of advanced cracking caused by stress concentration of the first groove section and the second groove section can be reduced, and the service life of the battery monomer can be prolonged; the first groove section is bent towards the central point of the pressure relief area, and the acting force borne by the first groove section is smaller, so that the possibility of stress deformation of the pressure relief area is smaller, and the possibility of early cracking of the nick groove is smaller; the second groove section is bent back to the central point of the pressure relief area, so that the area of the pressure relief area is larger, a larger pressure relief channel can be formed after the nick groove is stressed and opened, and the possibility of thermal runaway and even explosion of the single battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a pressure relief component, a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In battery technology, how to extend the service life of the battery is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiments of the present application provide a pressure relief component, a battery cell, a battery, and an electrical device, which can reduce the possibility of the notched groove of the pressure relief component cracking and releasing pressure prematurely, thereby extending the service life of the battery.

[0005] In a first aspect, the present application provides a pressure relief component for a battery cell, wherein the pressure relief component is provided with a notched groove, wherein the notched groove extends along a closed trajectory and encloses a pressure relief zone, wherein the notched groove includes a first groove segment and a second groove segment, wherein the first groove segment and the second groove segment are both arc segments, and the first groove segment is bent toward a center point of the pressure relief zone, and the second groove segment is bent away from the center point of the pressure relief zone.

[0006] In the above technical solution, the notched groove is provided on the pressure relief component, and the notched groove extends along a closed trajectory and encloses a pressure relief zone, so that the notched groove can be opened when the internal pressure of the battery cell reaches a threshold value to relieve pressure, which can reduce the possibility of thermal runaway or even explosion of the battery cell; the notched groove includes a first groove section and a second groove section, and the first groove section and the second groove section are arc sections, which can make the extension of the first groove section and the second groove section smooth and not easy to form a stress concentration point, thereby reducing the possibility of premature cracking of the first groove section and the second groove section due to concentrated force, thereby extending the service life of the battery cell; the first groove section is bent toward the center point of the pressure relief zone, so that when the internal pressure of the battery cell acts on the pressure relief component, the first groove section is subjected to a smaller force, thereby reducing the possibility of deformation of the pressure relief zone under force, and reducing the possibility of premature cracking of the notched groove, thereby extending the service life of the battery cell; the second groove section is bent away from the center point of the pressure relief zone, so that the area of ​​the pressure relief zone is larger, and a larger pressure relief channel can be formed after the notched groove is opened under force, which is convenient for realizing rapid pressure relief of the battery cell, and further reducing the possibility of thermal runaway or even explosion of the battery cell.

[0007] According to some embodiments of the present application, there is an arc transition between the first slot segment and the second slot segment.

[0008] In the above technical solution, by making an arc transition between the first groove section and the second groove section, it is possible to prevent stress concentration points from easily forming between the first groove section and the second groove section, thereby reducing the possibility of premature cracking caused by concentrated stress between the first groove section and the second groove section, and further extending the service life of the battery cell.

[0009] According to some embodiments of the present application, the scoring groove further includes a third groove section, the third groove section is arranged at an interval from the first groove section in a first direction, the second groove section connects the first groove section and the third groove section, the third groove section is an arc section, and the third groove section is bent toward the center point of the pressure relief area.

[0010] In the above technical solution, by providing the third groove section, and arranging the third groove section at an interval from the first groove section in the first direction, the second groove section connecting the first groove section and the third groove section, and the third groove section being an arc section, it is possible to make the extension of the third groove section smooth and prevent stress concentration points from easily forming, thereby reducing the possibility of premature cracking caused by concentrated stress on the third groove section, and further extending the service life of the battery cell; and the third groove section is bent toward the center point of the pressure relief area, so that when the internal pressure of the battery cell acts on the pressure relief component, the acting force on the third groove section is smaller, and further the possibility of the pressure relief area being deformed by force is smaller, and the possibility of the scoring groove cracking prematurely is smaller, thereby extending the service life of the battery cell.

[0011] According to some embodiments of the present application, the first groove section and the third groove section are symmetrically arranged with respect to the center point of the pressure relief area.

[0012] In the above technical solution, by making the first groove section and the third groove section symmetrically arranged with respect to the center point of the pressure relief area, the force on the scoring groove can be made more uniform, the possibility of the pressure relief area being deformed by force is smaller, the anti-deformation ability is stronger, and the possibility of the scoring groove cracking prematurely is smaller, thereby extending the service life of the battery cell.

[0013] According to some embodiments of the present application, the scoring groove further includes a fourth groove section, the fourth groove section is arranged at an interval from the second groove section in a second direction, the first groove section, the second groove section, the third groove section and the fourth groove section are connected end to end to form a closed ring, the fourth groove section is an arc section, and the fourth groove section is bent away from the center point of the pressure relief area; the second direction intersects with the first direction.

[0014] In the above technical solution, by providing a fourth groove section and arranging the fourth groove section at an interval from the second groove section in the second direction, the first groove section, the second groove section, the third groove section, and the fourth groove section are connected end to end to form a closed ring, and the fourth groove section is an arc section, which can make the extension of the fourth groove section smooth and not easily form stress concentration points, thereby reducing the possibility of premature cracking caused by concentrated stress on the fourth groove section, and further extending the service life of the battery cell; and the fourth groove section bends away from the center point of the pressure relief area, which can make the area of the pressure relief area larger, and a larger pressure relief channel can be formed after the scoring groove is forced to open, facilitating the rapid pressure relief of the battery cell and further reducing the possibility of thermal runaway or even explosion of the battery cell.

[0015] According to some embodiments of the present application, the second direction is perpendicular to the first direction.

[0016] In the above technical solution, by making the first direction perpendicular to the second direction, the interval direction between the first groove section and the third groove section and the interval direction between the second groove section and the fourth groove section can be perpendicular, further making the stress distribution of the scoring groove more uniform, and stress concentration points are not likely to appear in the scoring groove, reducing the possibility of premature cracking caused by concentrated stress on the scoring groove and extending the service life of the battery cell.

[0017] According to some embodiments of the present application, the second groove section and the fourth groove section are symmetrically arranged with respect to the center point of the pressure relief area.

[0018] In the above technical solution, by making the second groove section and the fourth groove section symmetrically arranged with respect to the center point of the pressure relief area, the stress on the scoring groove can be made more uniform, the possibility of deformation of the pressure relief area under stress is smaller, the anti-deformation ability is stronger, and the possibility of premature cracking of the scoring groove is smaller, thereby extending the service life of the battery cell.

[0019] According to some embodiments of the present application, the pressure relief component is provided with a sunk groove, and the scoring groove is arranged on the bottom wall of the sunk groove.

[0020] In the above technical solution, the pressure relief component is provided with a sunk groove, and the scoring groove is arranged on the bottom wall of the sunk groove, so that when the pressure relief component is under the action of the internal pressure of the battery cell, the bottom wall of the sunk groove is more likely to deform compared with other parts of the pressure relief component, so that when the internal pressure of the battery cell reaches the threshold value, the scoring groove can crack to form a pressure relief channel to realize the pressure relief of the battery cell.

[0021] According to some embodiments of the present application, the sunk groove is arranged in a shape of a runway, a circle or an ellipse.

[0022] In the above technical solution, the sinking groove is arranged in a runway shape, a circular shape or an oval shape, which can make the bottom wall of the sinking groove receive uniform force when the pressure relief component is affected by the internal pressure of the battery cell. Furthermore, the scoring groove can receive uniform force, and stress concentration points are not likely to appear, which can reduce the possibility of premature cracking caused by concentrated force on the scoring groove and extend the service life of the battery cell.

[0023] According to some embodiments of the present application, the sinking groove includes a first side wall, a second side wall, a third side wall and a fourth side wall. The first side wall and the third side wall are flat surfaces, and the second side wall and the fourth side wall are arc surfaces. The first side wall is located outside the first groove section, the second side wall is located outside the second groove section, the third side wall is located outside the third groove section, and the fourth side wall is located outside the fourth groove section.

[0024] In the above technical solution, by setting the first side wall and the third side wall as flat surfaces, the lengths of the first side wall and the third side wall can be set to be longer, so that the area of the sinking groove is larger; by setting the second side wall and the fourth side wall as arc surfaces, a larger sinking groove area can be enclosed under the condition that the width of the sinking groove is limited, so that the area of the pressure relief area is also larger. After the scoring groove is forced to open, a larger pressure relief channel can be formed, which is convenient for realizing the rapid pressure relief of the battery cell and further reducing the possibility of thermal runaway or even explosion of the battery cell.

[0025] According to some embodiments of the present application, from both ends of the first groove section to the middle, the distance between the first groove section and the first side wall gradually increases;

[0026] From both ends of the third groove section to the middle, the distance between the third groove section and the third side wall gradually increases.

[0027] In the above technical solution, by making the distance between the first groove section and the first side wall gradually increase from both ends of the first groove section to the middle, and the distance between the third groove section and the third side wall gradually increase from both ends of the third groove section to the middle, the extensions of the first groove section and the third groove section can be smooth, and stress concentration points are not likely to be formed. Thus, the possibility of premature cracking caused by concentrated force on the first groove section and the third groove section can be reduced, and the service life of the battery cell can be extended.

[0028] According to some embodiments of the present application, along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove section and the first side wall is W2, and the maximum distance between the third groove section and the third side wall is W3, satisfying 10% * W1 ≤ W2 ≤ 70% * W1, 10% * W1 ≤ W3 ≤ 70% * W1.

[0029] In the above technical solution, by making the distance W1 between the first side wall and the third side wall, the maximum distance W2 between the first groove section and the first side wall, and the maximum distance W3 between the third groove section and the third side wall satisfy 10% * W1 ≤ W2 ≤ 70% * W1, 10% * W1 ≤ W3 ≤ 70% * W1 along the first direction, it is convenient to prepare the scoring groove, and the first groove section and the third groove section are less affected by the internal force of the battery cell. Furthermore, the possibility of the pressure relief area deforming under force is smaller, the improvement of the anti-deformation ability is more obvious, and the possibility of the scoring groove cracking in advance is smaller, so that the service life of the battery cell can be extended.

[0030] According to some embodiments of the present application, along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove section and the first side wall is W2, and the maximum distance between the third groove section and the third side wall is W3, satisfying W2 + W3 < W1.

[0031] In the above technical solution, by making the distance W1 between the first side wall and the third side wall, the maximum distance W2 between the first groove section and the first side wall, and the maximum distance W3 between the third groove section and the third side wall satisfy W2 + W3 < W1 along the first direction, the first groove section and the third groove section are not connected, so that the problem of stress concentration and easy cracking at the connection caused by the connection of the first groove section and the third groove section can be reduced, and the possibility of the scoring groove cracking in advance is smaller, so that the service life of the battery cell can be extended.

[0032] According to some embodiments of the present application, the first groove section includes a first sub-groove section and a second sub-groove section, the included angle between the tangent of the first sub-groove section and the first side wall is α1, and the included angle between the tangent of the second sub-groove section and the first side wall is α2, satisfying 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°.

[0033] In the above technical solution, the first groove section includes a first sub-groove section and a second sub-groove section. By making the included angle α1 between the tangent of the first sub-groove section and the first side wall and the included angle α2 between the tangent of the second sub-groove section and the first side wall satisfy 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°, on the one hand, the first groove section can be further away from the first side wall of the sinking groove to further reduce the internal pressure of the battery cell on the first groove section; on the other hand, the corner amplitude at the connection between the first sub-groove section, the second sub-groove section and other groove sections can be reduced, and further the possibility of stress concentration points generated at the connection between the first sub-groove section, the second sub-groove section and other groove sections can be reduced, so that the possibility of the area enclosed by the scoring groove deforming under force is smaller, the anti-deformation ability is stronger, and the possibility of the scoring groove cracking in advance is smaller, so that the service life of the battery cell can be extended.

[0034] According to some embodiments of the present application, the length of the second groove section is L1, the length of the fourth groove section is L2, and the length of the notch groove is L, satisfying L1≥1 / 4*L and L2≥1 / 4*L.

[0035] In the above technical solution, by making the length L1 of the second groove section, the length L2 of the fourth groove section, and the length L of the notch groove satisfy L1≥1 / 4*L and L2≥1 / 4*L, it is possible to make the length of the second groove section, which is more stressed than the first groove section in the notch groove, longer, and the length of the fourth groove section, which is more stressed than the third groove section, longer. When the internal pressure of the battery cell reaches the threshold value, the second groove section and the fourth groove section are easily opened for pressure relief, and the area of the pressure relief area is made larger. After the notch groove is stressed and opened, a larger pressure relief channel can be formed, facilitating the rapid pressure relief of the battery cell and further reducing the possibility of thermal runaway or even explosion of the battery cell.

[0036] In a second aspect, the present application provides a battery cell including the pressure relief component as described above, and the pressure relief component is configured to release the internal pressure of the battery cell.

[0037] According to some embodiments of the present application, the battery cell further includes:

[0038] A housing having a wall portion;

[0039] wherein the pressure relief component is the wall portion.

[0040] In the above technical solution, the battery cell includes a housing having a wall portion, and the pressure relief component is the wall portion, such that when the pressure relief component is opened, i.e., a part of the housing is opened, the internal pressure of the battery cell can be released.

[0041] According to some embodiments of the present application, the battery cell further includes:

[0042] A housing having a wall portion, and the wall portion has a pressure relief hole;

[0043] wherein the pressure relief component is installed on the wall portion and covers the pressure relief hole.

[0044] In the above technical solution, the housing has a wall portion, the wall portion has a pressure relief hole, the pressure relief component is installed on the wall portion and covers the pressure relief hole, and the preparation and assembly of the pressure relief component are simple.

[0045] According to some embodiments of the present application, the housing includes:

[0046] A housing body, an accommodation cavity with an opening is formed inside, and the accommodation cavity is used to accommodate the electrode assembly;

[0047] An end cap for closing the opening;

[0048] wherein the end cap is the wall portion.

[0049] In the above technical solution, the end cap is a wall portion, so that when the pressure relief component is opened, that is, a part of the end cap is opened, the internal pressure of the battery cell can be released.

[0050] According to some embodiments of the present application, the housing includes:

[0051] A housing, an accommodation cavity with an opening is formed inside, and the accommodation cavity is used to accommodate the electrode assembly;

[0052] An end cap for closing the opening;

[0053] Wherein, the housing includes the wall portion.

[0054] In the above technical solution, the housing includes a wall portion, so that when the pressure relief component is opened, that is, a part of the housing is opened, the internal pressure of the battery cell can be released.

[0055] In a third aspect, the present application provides a battery including the battery cell as described above.

[0056] In a fourth aspect, the present application provides an electrical device including the battery as described above, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0058] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0059] Figure 2 is an exploded structural diagram of a battery provided by some embodiments of the present application;

[0060] Figure 3 is an exploded structural diagram of a battery cell provided by some embodiments of the present application;

[0061] Figure 4 is a three-dimensional structural diagram of a pressure relief component provided by some embodiments of the present application;

[0062] Figure 5 is a structural diagram of a pressure relief component from one perspective provided by some embodiments of the present application;

[0063] Figure 6 is Figure 5Schematic cross-sectional structure diagram of the pressure relief component along A-A;

[0064] Figure 7 is Figure 6 Schematic enlarged partial structure diagram at position B of the pressure relief component in [the figure];

[0065] Figure 8 Schematic perspective view of a part of the structure of the pressure relief component provided by some embodiments of the present application;

[0066] Figure 9 Schematic structure diagram of one perspective of the pressure relief component provided by some embodiments of the present application;

[0067] Figure 10 is Figure 5 Schematic enlarged partial structure diagram at position C of the pressure relief component in [the figure];

[0068] Figure 11 Schematic explosion structure diagram of the pressure relief component provided by some other embodiments of the present application.

[0069] Icon: 1000 - vehicle; 100 - battery; 10 - box body; 11 - first sub-box body; 12 - second sub-box body; 20 - battery cell; 21 - outer shell; 211 - end cover; 2111 - electrode terminal; 212 - housing; 22 - electrode assembly; 221 - tab; 23 - pressure relief component; 231 - scoring groove; 2311 - first groove section; 2311a - first sub-groove section; 2311b - second sub-groove section; 2312 - second groove section; 2313 - third groove section; 2314 - fourth groove section; 232 - sinking groove; 2321 - first side wall; 2322 - second side wall; 2323 - third side wall; 2324 - fourth side wall; 233 - pressure relief hole; 200 - controller; 300 - motor; X - first direction; Y - second direction; Z - third direction. Detailed implementation manners

[0070] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0071] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification 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, claims and above-mentioned drawings of this application are intended to cover non-exclusive inclusion.

[0072] The terms "first", "second", etc. in the specification, claims or above-mentioned drawings of this application are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0073] Referring to "embodiment" in this application means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0074] The "plurality" mentioned in this application refers to two or more (including two).

[0075] The battery mentioned in the embodiments of this application refers to a single physical module including a plurality of battery cells to provide a higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack, etc. The battery generally may also include a box for encapsulating one or more battery cells or a plurality of battery modules. The box can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0076] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode plate, a negative electrode plate and a separator. The battery cell mainly operates by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector, and the current collector without the positive electrode active material layer is used as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode plate includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector, and the current collector without the negative electrode active material layer is used as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure passing a large current without fusing, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0077] The battery cell further includes a housing having a wall portion, which can be an end cap or at least part of the housing body. The end cap closes the opening of the housing body to define a receiving space for receiving the electrode assembly.

[0078] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, and low self-discharge coefficient, and are an important part of the current new energy development. With the development of the new energy industry, batteries are gradually developing towards large-scale and integrated directions. The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, discharge capacity, charge-discharge rate, etc. In addition, the service life of the battery also needs to be considered.

[0079] However, during the operation of the battery cell, heat and gas are generated, resulting in an increase in the internal pressure of the battery cell. If the internal pressure of the battery cell cannot be released in time, problems such as thermal runaway and even explosion are likely to occur. Therefore, the battery cell can be provided with a pressure relief mechanism to form a pressure relief channel when the internal pressure of the battery cell reaches a threshold value, releasing the internal pressure of the battery cell to reduce the possibility of thermal runaway of the battery cell. The pressure relief mechanism can include a scoring groove formed on the housing of the battery cell. However, during the charge-discharge process of the battery cell, the internal pressure changes, and the area around the scoring groove is easily deformed under force. Moreover, during the repeated change process of the internal pressure of the battery cell from large to small and then to large, the area around the scoring groove is also easily deformed repeatedly, resulting in the area around the scoring groove being in a state of breathing fatigue for a long time and being prone to premature cracking, which in turn leads to liquid leakage of the battery cell, affecting the normal charge-discharge of the battery cell and shortening the service life of the battery cell.

[0080] Based on the above considerations, the present application provides a pressure relief component for a battery cell. The pressure relief component is provided with a scoring groove, and the scoring groove extends along a closed trajectory and encloses a pressure relief area. The scoring groove includes a first groove segment and a second groove segment. Both the first groove segment and the second groove segment are arc segments, and the first groove segment bends towards the center point of the pressure relief area, while the second groove segment bends away from the center point of the pressure relief area.

[0081] In the technical solution of this application, by providing a scoring groove on the pressure relief component, and the scoring groove extends along a closed trajectory and encloses a pressure relief area, the scoring groove can be opened when the internal pressure of the battery cell reaches the threshold value to relieve pressure, which can reduce the possibility of thermal runaway or even explosion of the battery cell; the scoring groove includes a first groove section and a second groove section, and both the first groove section and the second groove section are arc segments, which can make the extensions of the first groove section and the second groove section smooth and not easily form stress concentration points, thereby reducing the possibility of premature cracking caused by concentrated stress on the first groove section and the second groove section, and further extending the service life of the battery cell; the first groove section bends towards the center point of the pressure relief area. Since when the pressure relief component is stressed, the outer periphery of the pressure relief area is more likely to deform and the stress is more concentrated, and the stress will extend from the edge of the pressure relief area to the center point of the pressure relief area, the stress in the part of the pressure relief area closer to the center point is smaller. When the internal pressure of the battery cell acts on the pressure relief component, the acting force on the first groove section is smaller, and further the possibility of deformation of the pressure relief area under stress is smaller, and the possibility of premature cracking of the scoring groove is smaller, thus extending the service life of the battery cell; the second groove section bends away from the center point of the pressure relief area, which can make the area of the pressure relief area larger. After the scoring groove is stressed and opened, a larger pressure relief channel can be formed, facilitating rapid pressure relief of the battery cell and further reducing the possibility of thermal runaway or even explosion of the battery cell.

[0082] The battery disclosed in the embodiments of this application can be used in, but is not limited to, electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery disclosed in this application.

[0083] The embodiments of this application provide an electrical equipment using a battery as a power source. The electrical equipment can be, but is not limited to, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys. For example, game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0084] The battery described in the embodiments of this application is not only limited to the electrical equipment described above, but can also be applied to all electrical equipment that wants to use a battery. For the sake of simplicity of description, the following embodiments will take a vehicle as an example of an electrical equipment for illustration.

[0085] Please refer to Figure 1 , Figure 1Schematic structural diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can serve as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, such as for the working power requirements during the start, navigation, and operation of the vehicle 1000.

[0086] The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0087] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000 but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0088] Please refer to Figure 2 , Figure 2 Explosion structural diagram of a battery provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first sub-box body 11 and a second sub-box body 12. The first sub-box body 11 and the second sub-box body 12 are mutually covered, and the first sub-box body 11 and the second sub-box body 12 jointly define an accommodation space for accommodating the battery cells 20. The first sub-box body 11 can be a hollow structure with one end open, and the second sub-box body 12 can be a plate-like structure. The second sub-box body 12 covers the open side of the first sub-box body 11 so that the first sub-box body 11 and the second sub-box body 12 jointly define the accommodation space; the first sub-box body 11 and the second sub-box body 12 can also both be hollow structures with one side open, and the open side of the second sub-box body 12 covers the open side of the first sub-box body 11.

[0089] In some embodiments, the box body 10 can be a cuboid.

[0090] In some other embodiments, the box body 10 can also be a cylinder.

[0091] In some embodiments, the box body 10 can be made of aluminum, aluminum alloy, or other metal materials, so that the box body 10 has high mechanical properties.

[0092] In some other embodiments, the box body 10 can also be made of non-metallic materials with relatively high strength, such as carbon fiber and rigid plastics.

[0093] In the battery 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, parallel or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, parallel or in a hybrid connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be in the form that multiple battery cells 20 are first connected in series, parallel or in a hybrid connection to form battery modules, and then the multiple battery modules are connected in series, parallel or in a hybrid connection to form a whole and are accommodated in the box body 10. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0094] Among them, the battery cell 20 can be a secondary battery or a primary battery; the battery cell 20 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0095] Please refer to Figure 3 , Figure 3 , which is a schematic diagram of the explosion structure of the battery cell provided in some embodiments of the present application. As Figure 3 shown, the battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components.

[0096] The housing 21 includes an end cap 211 and a housing body 212. The housing body 212 has an opening, and the end cap 211 closes the opening.

[0097] The end cap 211 refers to a component that covers the opening of the housing body 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 211 can be adapted to the shape of the housing body 212 to cooperate with the housing body 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 211 is not easily deformed when being squeezed or collided, so that the battery cell 20 can have higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 2111 can be provided on the end cap 211. The electrode terminals 2111 can be used for electrically connecting with the electrode assembly 22 to output or input the electric energy of the battery cell 20. The material of the end cap 211 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 211. The insulating structure can be used to isolate the electrical connection components in the housing body 212 from the end cap 211 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0098] The housing 212 is a component for cooperating with the end cap 211 to form the internal environment of the battery cell 20. Among them, the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The housing 212 and the end cap 211 can be independent components. The housing 212 can be of various shapes and sizes. Specifically, the shape of the housing 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0099] In some embodiments, the housing 212 can be a hollow structure with an opening on one side, and the end cap 211 can be arranged as a flat plate and cover the opening of the housing 212.

[0100] In some other embodiments, both the end cap 211 and the housing 212 can be hollow structures with an opening on one side, and the opening side of the end cap 211 covers the opening side of the housing 212 to jointly form an accommodating space.

[0101] In some embodiments, the end cap 211 and the housing 212 can be connected by welding.

[0102] In some other embodiments, the end cap 211 and the housing 212 can also be fixedly connected by bonding, interference fit, etc.

[0103] In some embodiments, the battery cell 20 can be in the shape of a cuboid, so that multiple battery cells 20 can be arranged tightly in a matrix, which is beneficial to improving the energy density of the battery 100.

[0104] In some other embodiments, the battery cell 20 can also be in the shape of a flat body, a cylinder or other shapes.

[0105] The electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs. The housing 212 can contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and usually a separator is provided between the positive electrode plate and the negative electrode plate. The separator is used to separate the positive electrode plate and the negative electrode plate to prevent internal short circuit between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active substances constitute the main body of the electrode assembly 22, and the parts of the positive electrode plate and the negative electrode plate without active substances respectively constitute the electrode tabs 221. The positive electrode tab and the negative electrode tab can be located at one end of the main body together or at both ends of the main body respectively. During the charge and discharge process of the battery, the positive active substance and the negative active substance react with the electrolyte, and the electrode tab 221 is connected to the electrode terminal 2111 to form an electric current loop.

[0106] Please refer to Figures 4 to 8 , Figure 4 is a schematic three-dimensional structure diagram of a pressure relief component provided in some embodiments of the present application;Figure 5 Schematic structural diagram of a pressure relief component from a perspective provided by some embodiments of the present application; Figure 6 For Figure 5 Schematic cross-sectional structural diagram of the pressure relief component along A-A in; Figure 7 For Figure 6 Schematic diagram of partial enlargement at position B of the pressure relief component in; Figure 8 Schematic perspective diagram of a partial structure of the pressure relief component provided by some embodiments of the present application.

[0107] Some embodiments of the present application provide a pressure relief component 23 for a battery cell 20. The pressure relief component 23 is provided with a scoring groove 231. The scoring groove 231 extends along a closed trajectory and encloses a pressure relief area. The scoring groove 231 includes a first groove segment 2311 and a second groove segment 2312. Both the first groove segment 2311 and the second groove segment 2312 are arc segments, and the first groove segment 2311 bends towards the center point of the pressure relief area, while the second groove segment 2312 bends away from the center point of the pressure relief area.

[0108] The pressure relief component 23 is a component constituting the outer shell of the battery cell 20.

[0109] By providing the scoring groove 231 in the pressure relief component 23, and the scoring groove 231 extends along a closed trajectory and encloses a pressure relief area, the scoring groove 231 can be opened when the internal pressure of the battery cell 20 reaches a threshold value for pressure relief, which can reduce the possibility of thermal runaway or even explosion of the battery cell 20. The scoring groove 231 includes a first groove segment 2311 and a second groove segment 2312. Both the first groove segment 2311 and the second groove segment 2312 are arc segments, which can make the extensions of the first groove segment 2311 and the second groove segment 2312 smooth and not easily form stress concentration points, thereby reducing the possibility of premature cracking caused by concentrated stress on the first groove segment 2311 and the second groove segment 2312, and further extending the service life of the battery cell 20. The first groove segment 2311 bends towards the center point of the pressure relief area. When the pressure relief component 23 is stressed, the outer periphery of the pressure relief area is more likely to deform, the stress is more concentrated, and the stress extends from the edge of the pressure relief area towards the center point of the pressure relief area. Therefore, the stress in the part of the pressure relief area closer to the center point is smaller. When the internal pressure of the battery cell 20 acts on the pressure relief component 23, the acting force on the first groove segment 2311 is smaller, further reducing the possibility of deformation of the pressure relief area under stress and the possibility of premature cracking of the scoring groove 231, thereby extending the service life of the battery cell 20. The second groove segment 2312 bends away from the center point of the pressure relief area, which can make the area of the pressure relief area larger. After the scoring groove 231 is stressed and opened, a larger pressure relief channel can be formed, facilitating rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0110] According to some embodiments of the present application, there is an arc transition between the first groove section 2311 and the second groove section 2312. That is, the connection between the first groove section 2311 and the second groove section 2312 is arranged in an arc shape.

[0111] By making an arc transition between the first groove section 2311 and the second groove section 2312, it is possible to prevent stress concentration points from easily forming between the first groove section 2311 and the second groove section 2312. Thus, the possibility of premature cracking caused by concentrated stress at the connection between the first groove section 2311 and the second groove section 2312 can be reduced, and further, the service life of the battery cell 20 can be extended.

[0112] According to some embodiments of the present application, the scoring groove 231 further includes a third groove section 2313. The third groove section 2313 is spaced from the first groove section 2311 along the first direction X. The second groove section 2312 connects the first groove section 2311 and the third groove section 2313. The third groove section 2313 is an arc section and bends towards the center point of the pressure relief area.

[0113] By providing the third groove section 2313 and making the third groove section 2313 spaced from the first groove section 2311 along the first direction X, the distribution of the scoring groove 231 can be made more uniform, the possibility of stress concentration points in the scoring groove 231 is smaller, and the possibility of premature cracking of the scoring groove 231 is smaller. Thus, the service life of the battery cell 20 can be extended. The second groove section 2312 connects the first groove section 2311 and the third groove section 2313. The third groove section 2313 is an arc section, which can make the extension of the third groove section 2313 smooth and not easily form stress concentration points. Thus, the possibility of premature cracking caused by concentrated stress on the third groove section 2313 can be reduced, and further, the service life of the battery cell 20 can be extended. And the third groove section 2313 bends towards the center point of the pressure relief area, which can make the internal pressure of the battery cell 20 act on the pressure relief component 23, the force received by the third groove section 2313 is smaller, and further, the possibility of deformation of the pressure relief area due to force is smaller, and the possibility of premature cracking of the scoring groove 231 is smaller. Thus, the service life of the battery cell 20 can be extended.

[0114] According to some embodiments of the present application, there is an arc transition between the second groove section 2312 and the third groove section 2313, which can make the transition part between the second groove section 2312 and the third groove section 2313 smooth and not easily form stress concentration points. Thus, the possibility of premature cracking caused by concentrated stress at the connection between the second groove section 2312 and the third groove section 2313 can be reduced, and the service life of the battery cell 20 can be extended.

[0115] Please refer to Figure 9 , Figure 9 which is a schematic structural diagram of a pressure relief component from a perspective provided by some embodiments of the present application.

[0116] According to some embodiments of the present application, the first groove section 2311 is symmetrically arranged with respect to the center point of the pressure relief area of the third groove section 2313.

[0117] The center point of the pressure relief area may be the geometric center point of the pressure relief area.

[0118] By making the first groove section 2311 symmetrically arranged with respect to the center point of the pressure relief area of the third groove section 2313, the force on the scoring groove 231 can be made more uniform, the possibility of the pressure relief area deforming under force is smaller, the anti-deformation ability is stronger, and the possibility of the scoring groove 231 cracking in advance is smaller, so that the service life of the battery cell 20 can be extended.

[0119] According to some embodiments of the present application, the scoring groove 231 further includes a fourth groove section 2314. The fourth groove section 2314 and the second groove section 2312 are arranged at intervals along the second direction Y. The first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 are connected end to end to form a closed ring. The fourth groove section 2314 is an arc section, and the fourth groove section 2314 bends away from the center point of the pressure relief area; the second direction Y intersects with the first direction X.

[0120] By providing the fourth groove section 2314 and making the fourth groove section 2314 and the second groove section 2312 arranged at intervals along the second direction Y, the distribution of the scoring groove 231 can be made more uniform, the possibility of stress concentration points being generated in the scoring groove 231 is smaller, and the possibility of the scoring groove 231 cracking in advance is smaller, so that the service life of the battery cell 20 can be extended. The first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 are connected end to end to form a closed ring, so that when the battery cell 20 has a thermal runaway, the scoring groove 231 can be opened, and the pressure relief area can be separated from other areas of the pressure relief component 23 to form a pressure relief channel with a larger area, facilitating the rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20. The fourth groove section 2314 is an arc section, which can make the extension of the fourth groove section 2314 smooth and not easily form stress concentration points, so that the possibility of the fourth groove section 2314 cracking in advance due to concentrated force can be reduced, and further the service life of the battery cell 20 can be extended. And the fourth groove section 2314 bends away from the center point of the pressure relief area, which can make the area of the pressure relief area larger, and a larger pressure relief channel can be formed after the scoring groove 231 is opened by force, facilitating the rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0121] According to some embodiments of the present application, an arc transition can be provided between the third slot section 2313 and the fourth slot section 2314, and between the fourth slot section 2314 and the first slot section 2311, which can make the transition parts between the third slot section 2313 and the fourth slot section 2314, and between the fourth slot section 2314 and the first slot section 2311 smooth, and stress concentration points are not easily formed, thereby reducing the possibility of premature cracking caused by concentrated stress at the joints between the third slot section 2313 and the fourth slot section 2314, and between the fourth slot section 2314 and the first slot section 2311, and extending the service life of the battery cell 20.

[0122] According to some embodiments of the present application, the second direction Y is perpendicular to the first direction X.

[0123] By making the first direction X perpendicular to the second direction Y, the interval directions between the first slot section 2311 and the third slot section 2313, and between the second slot section 2312 and the fourth slot section 2314 can be perpendicular, further making the stress distribution of the notch groove 231 more uniform, stress concentration points are not easily present in the notch groove 231, reducing the possibility of premature cracking caused by concentrated stress in the notch groove 231, and extending the service life of the battery cell 20.

[0124] According to some embodiments of the present application, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other pairwise. The first direction X is parallel to the width direction of the pressure relief component 23, the second direction Y is parallel to the length direction of the pressure relief component 23, and the third direction Z is parallel to the thickness direction of the pressure relief component 23.

[0125] According to some embodiments of the present application, the second slot section 2312 and the fourth slot section 2314 are symmetrically arranged with respect to the center point of the pressure relief area.

[0126] By making the second slot section 2312 and the fourth slot section 2314 symmetrically arranged with respect to the center point of the pressure relief area, the stress on the notch groove 231 can be made more uniform, the possibility of stress deformation in the pressure relief area is smaller, the anti-deformation ability is stronger, and the possibility of premature cracking of the notch groove 231 is smaller, thereby extending the service life of the battery cell 20.

[0127] According to some embodiments of the present application, the depths of the first slot section 2311, the second slot section 2312, and the fourth slot section 2314 are greater than the depth of the third slot section 2313.

[0128] The depth of the notch groove 231 is the dimension of the notch groove 231 in the third direction Z.

[0129] By making the depths of the first groove section 2311, the second groove section 2312, and the fourth groove section 2314 greater than the depth of the third groove section 2313, the first groove section 2311, the second groove section 2312, and the fourth groove section 2314 can be forced to open prior to the second groove section 2312 to form a pressure relief channel, and the area of the pressure relief component 23 enclosed by the scoring groove 231 can be kept connected to other areas, reducing the possibility of interference and damage with other components after the area enclosed by the scoring groove 231 is separated from other areas.

[0130] In some other embodiments, the depths of three other groove sections among the first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 can also be greater than the depth of the other groove section. For example, the depths of the first groove section 2311, the second groove section 2312, and the third groove section 2313 are greater than the depth of the fourth groove section 2314.

[0131] In some other embodiments, the depths of two connected groove sections among the first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 can also be greater than the depths of the other two groove sections. For example, the depths of the first groove section 2311 and the second groove section 2312 are greater than the depths of the third groove section 2313 and the fourth groove section 2314.

[0132] In some other embodiments, the depth of one groove section among the first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 can also be greater than the depths of the other three groove sections. For example, the depth of the first groove section 2311 is greater than the depths of the second groove section 2312, the third groove section 2313, and the fourth groove section 2314.

[0133] In some other embodiments, the depths of multiple groove sections that are greater than the depths of other groove sections can be the same or different. For example, in the case where the depths of the first groove section 2311, the second groove section 2312, and the fourth groove section 2314 are greater than the depth of the third groove section 2313, the depths of the first groove section 2311, the second groove section 2312, and the fourth groove section 2314 can also be different. For example, the depth of the first groove section 2311 is greater than the depth of the fourth groove section 2314, and the depth of the second groove section 2312 is greater than the depth of the first groove section 2311, such that the second groove section 2312, the first groove section 2311, the fourth groove section 2314, and the third groove section 2313 can be opened in sequence when the internal pressure of the battery cell 20 reaches the threshold value, and the greater the internal pressure of the battery cell 20, the more groove sections are opened, the larger the area of the formed pressure relief channel, and the faster the pressure relief speed.

[0134] According to some embodiments of the present application, the pressure relief component 23 is provided with a sinking groove 232, and the scoring groove 231 is provided on the bottom wall of the sinking groove 232.

[0135] The bottom wall of the sink 232 is arranged opposite to the opening of the sink 232 , and the side wall of the sink 232 refers to the wall surrounding the bottom wall of the sink 232 .

[0136] The pressure relief component 23 is provided with a sink 232, and the notched groove 231 is provided on the bottom wall of the sink 232, so that when the pressure relief component 23 is subjected to the internal pressure of the battery cell 20, the bottom wall of the sink 232 is more easily deformed than other parts of the pressure relief component 23, so that when the internal pressure of the battery cell 20 reaches a threshold value, the notched groove 231 can crack to form a pressure relief channel, thereby achieving pressure relief of the battery cell 20.

[0137] According to some embodiments of the present application, the sink 232 is arranged in a racetrack shape.

[0138] In other embodiments, the sink 232 may also be provided in other shapes such as a circle or an ellipse.

[0139] The groove 232 is set in a runway shape, a circle or an ellipse, so that when the pressure relief component 23 is subjected to the internal pressure of the battery cell 20, the bottom wall of the groove 232 can be evenly stressed, and the score groove 231 can be evenly stressed, which is less likely to have stress concentration points, and the possibility of premature cracking caused by the concentrated stress on the score groove 231 can be reduced, thereby extending the service life of the battery cell 20.

[0140] According to some embodiments of the present application, the sink 232 includes a first side wall 2321, a second side wall 2322, a third side wall 2323 and a fourth side wall 2324, the first side wall 2321 and the third side wall 2323 are planes, the second side wall 2322 and the fourth side wall 2324 are arcuate surfaces, the first side wall 2321 is located on the outside of the first groove section 2311, the second side wall 2322 is located on the outside of the second groove section 2312, the third side wall 2323 is located on the outside of the third groove section 2313, and the fourth side wall 2324 is located on the outside of the fourth groove section 2314.

[0141] The outer side of the first slot segment 2311 refers to the side of the first slot segment 2311 away from the center of the pressure relief zone, the outer side of the second slot segment 2312 refers to the side of the second slot segment 2312 away from the center of the pressure relief zone, the outer side of the third slot segment 2313 refers to the side of the third slot segment 2313 away from the center of the pressure relief zone, and the outer side of the fourth slot segment 2314 refers to the side of the fourth slot segment 2314 away from the center of the pressure relief zone.

[0142] Since the pressure relief component 23 provided in some embodiments of the present application is rectangular, the width of the pressure relief component 23 along the first direction X is relatively narrow, while the length along the second direction Y is relatively long, resulting in limited dimensions of the sinking groove 232 provided on the pressure relief component 23 along the first direction X, while the dimensions along the second direction Y can be set relatively large. Therefore, by setting the first side wall 2321 and the third side wall 2323 as flat surfaces, the lengths of the first side wall 2321 and the third side wall 2323 can be set relatively long, making the area of the sinking groove 232 relatively large. By setting the second side wall 2322 and the fourth side wall 2324 as arc-shaped surfaces, it is possible to further enclose a larger area of the sinking groove 232 under the condition that the width of the sinking groove 232 is limited, so that the area of the pressure relief area is also relatively large. After the scoring groove 231 is forced to open, a relatively large pressure relief channel can be formed, facilitating the rapid pressure relief of the battery cell 20 and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0143] In some other embodiments, the first side wall 2321 and the third side wall 2323 can also be arc-shaped surfaces, and the second side wall 2322 and the fourth side wall 2324 can also be flat surfaces.

[0144] In some other embodiments, the first side wall 2321, the second side wall 2322, the third side wall 2323, and the fourth side wall 2324 can be set as arc-shaped surfaces or flat surfaces according to the shape of the pressure relief component 23.

[0145] According to some embodiments of the present application, from the two ends of the first groove section 2311 towards the middle, the distance between the first groove section 2311 and the first side wall 2321 gradually increases. From the two ends of the third groove section 2313 towards the middle, the distance between the third groove section 2313 and the third side wall 2323 gradually increases.

[0146] Wherein, the distance between the first groove section 2311 and the first side wall 2321 is the distance between the first groove section 2311 and the first side wall 2321 along the first direction X. The distance between the third groove section 2313 and the third side wall 2323 is the distance between the third groove section 2313 and the third side wall 2323 along the first direction X.

[0147] By making the distance between the first groove section 2311 and the first side wall 2321 gradually increase from the two ends of the first groove section 2311 towards the middle, and the distance between the third groove section 2313 and the third side wall 2323 gradually increase from the two ends of the third groove section 2313 towards the middle, the extensions of the first groove section 2311 and the third groove section 2313 can be made smooth, and stress concentration points are not easily formed, thereby reducing the possibility of premature cracking caused by concentrated stress on the first groove section 2311 and the third groove section 2313, and prolonging the service life of the battery cell 20.

[0148] In some other embodiments, from both ends of the first groove section 2311 towards the middle, the distance between the first groove section 2311 and the first side wall 2321 can also gradually increase in part and remain unchanged in part, that is, the first groove section 2311 can extend partially away from the first side wall 2321 and partially along a direction parallel to the first side wall 2321.

[0149] In some other embodiments, it is also possible that from one end of the first groove section 2311 towards the middle, the distance between the first groove section 2311 and the first side wall 2321 gradually increases, and the distance between the other end of the first groove section 2311 and the first side wall 2321 remains unchanged.

[0150] Please refer to Figure 10 , Figure 10 for Figure 5 the partial enlarged structural schematic diagram of the C position of the pressure relief component in

[0151] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2321 and the third side wall 2323 is W1, the maximum distance between the first groove section 2311 and the first side wall 2321 is W2, and the maximum distance between the third groove section 2313 and the third side wall 2323 is W3, satisfying 10% * W1 ≤ W2 ≤ 70% * W1, 10% * W1 ≤ W3 ≤ 70% * W1. For example, W2 can be 10% * W1, 40% * W1 or 70% * W1, etc., and W3 can be 10% * W1, 35% * W1 or 70% * W1, etc.

[0152] By making the distance W1 between the first side wall 2321 and the third side wall 2323, the maximum distance W2 between the first groove section 2311 and the first side wall 2321, and the maximum distance W3 between the third groove section 2313 and the third side wall 2323 satisfy 10% * W1 ≤ W2 ≤ 70% * W1, 10% * W1 ≤ W3 ≤ 70% * W1 along the first direction X, it is convenient to prepare the notch groove 231, and the first groove section 2311 and the third groove section 2313 are less affected by the force inside the battery cell 20. Furthermore, the possibility of the pressure relief area deforming under force is smaller, the improvement of the anti-deformation ability is more obvious, and the possibility of the notch groove 231 cracking in advance is smaller, so that the service life of the battery cell 20 can be extended.

[0153] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2321 and the third side wall 2323 is W1, the maximum distance between the first groove section 2311 and the first side wall 2321 is W2, and the maximum distance between the third groove section 2313 and the third side wall 2323 is W3, satisfying W2 + W3 < W1.

[0154] By making the distance W1 between the first side wall 2321 and the third side wall 2323 along the first direction X, the maximum distance W2 between the first groove segment 2311 and the first side wall 2321, and the maximum distance W3 between the third groove segment 2313 and the third side wall 2323 satisfy W2 + W3 < W1, the first groove segment 2311 and the third groove segment 2313 are not connected, thereby being able to reduce the problem that stress concentration is likely to occur at the connection between the first groove segment 2311 and the third groove segment 2313 and it is easy to crack. The possibility of the scoring groove 231 cracking in advance is smaller, so that the service life of the battery cell 20 can be extended.

[0155] According to some embodiments of the present application, the first groove segment 2311 includes a first sub-groove segment 2311a and a second sub-groove segment 2311b. The included angle between the tangent of the first sub-groove segment 2311a and the first side wall 2321 is α1, and the included angle between the tangent of the second sub-groove segment 2311b and the first side wall 2321 is α2, satisfying 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°. For example, α1 can be 40°, 60° or 80°, etc., and α2 can be 40°, 55° or 80°, etc.

[0156] The first groove segment 2311 includes a first sub-groove segment 2311a and a second sub-groove segment 2311b. By making the included angle α1 between the tangent of the first sub-groove segment 2311a and the first side wall 2321 and the included angle α2 between the tangent of the second sub-groove segment 2311b and the first side wall 2321 satisfy 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°. On the one hand, the first groove segment 2311 can be further away from the first side wall 2321 of the sinking groove 232 to further reduce the pressure inside the battery cell received by the first groove segment 2311. On the other hand, the corner amplitude at the connection between the first sub-groove segment 2311a, the second sub-groove segment 2311b and other groove segments can be reduced, and further the possibility of stress concentration points generated at the connection between the first sub-groove segment 2311a, the second sub-groove segment 2311b and other groove segments can be reduced. The possibility of the area enclosed by the scoring groove 231 deforming under force is smaller, and the anti-deformation ability is stronger. The possibility of the scoring groove 231 cracking in advance is smaller, so that the service life of the battery cell 20 can be extended.

[0157] According to some embodiments of the present application, the third groove segment 2313 includes a third sub-groove segment 2313a and a fourth sub-groove segment 2313b. The included angle between the tangent of the third sub-groove segment 2313a and the third side wall 2323 is α3, and the included angle between the tangent of the fourth sub-groove segment 2313b and the third side wall 2323 is α4, satisfying 40° ≤ α3 ≤ 80°, 40° ≤ α4 ≤ 80°. For example, α3 can be 40°, 65° or 80°, etc., and α4 can be 40°, 50° or 80°, etc.

[0158] By making the included angle α3 between the tangent of the third sub-groove segment 2313a and the third side wall 2323, and the included angle α4 between the tangent of the fourth sub-groove segment 2313b and the third side wall 2323 satisfy 40° ≤ α3 ≤ 80° and 40° ≤ α4 ≤ 80°, on the one hand, the third groove segment 2313 can be made to be further away from the third side wall 2323 of the sinking groove 232, so as to further reduce the pressure inside the battery cell on the third groove segment 2313; on the other hand, the corner amplitude at the connection between the third sub-groove segment 2313a, the fourth sub-groove segment 2313b and other groove segments can be reduced, and further the possibility of stress concentration points generated at the connection between the third sub-groove segment 2313a, the fourth sub-groove segment 2313b and other groove segments can be reduced, making the possibility of the area enclosed by the notch groove 231 deforming under force smaller, the anti-deformation ability stronger, and the possibility of the notch groove 231 cracking in advance smaller, thereby being able to extend the service life of the battery cell 20.

[0159] According to some embodiments of the present application, the length of the second groove segment 2312 is L1, the length of the fourth groove segment 2314 is L2, and the length of the notch groove 231 is L, satisfying L1 ≥ 1 / 4*L and L2 ≥ 1 / 4*L. For example, L1 can be 1 / 4*L, 1 / 3*L, 2 / 5*L, etc., and L2 can be 1 / 4*L, 1 / 3*L, 2 / 5*L, etc.

[0160] By making the length L1 of the second groove segment 2312, the length L2 of the fourth groove segment 2314, and the length L of the notch groove 231 satisfy L1 ≥ 1 / 4*L and L2 ≥ 1 / 4*L, it can be made that the length of the second groove segment 2312, which is more stressed than the first groove segment 2311 in the notch groove 231, is longer, and the length of the fourth groove segment 2314, which is more stressed than the third groove segment 2313, is longer. When the internal pressure of the battery cell 20 reaches the threshold, the second groove segment 2312 and the fourth groove segment 2314 are easy to open for pressure relief, and the area of the pressure relief area is made larger. After the notch groove 231 is stressed and opened, a larger pressure relief channel can be formed, facilitating the rapid pressure relief of the battery cell 20, and further reducing the possibility of thermal runaway or even explosion of the battery cell 20.

[0161] Please refer to Figure 3 and Figure 4 , the embodiments of the present application provide a battery cell 20, including the pressure relief component 23 provided in any of the above embodiments, and the pressure relief component 23 is configured to relieve the internal pressure of the battery cell 20.

[0162] According to some embodiments of the present application, the battery cell 20 further includes a housing 21, the housing 21 has a wall portion, and the pressure relief component 23 is the wall portion. That is, the notch groove 231 and the sinking groove 232 are directly formed on the wall portion.

[0163] The battery cell 20 includes a housing 21 which has a wall portion. The pressure relief component 23 is the wall portion, such that when the pressure relief component 23 is opened, i.e., a part of the housing 21 is opened, the internal pressure of the battery cell 20 can be released.

[0164] Please refer to Figure 11 , Figure 11 which is an exploded structural schematic diagram of the pressure relief component provided in some other embodiments of the present application. Another battery cell 20 is provided in an embodiment of the present application, including the pressure relief component 23 and the housing 21 provided in any of the above embodiments. The pressure relief component 23 is configured to release the internal pressure of the battery cell 20. The housing 21 has a wall portion 24 which has a pressure relief hole 241. The pressure relief component 23 is installed on the wall portion 24 and covers the pressure relief hole 241. The preparation and assembly of the pressure relief component 23 are simple.

[0165] According to some embodiments of the present application, the housing 21 includes an end cap 211 and a housing body 212. An accommodation cavity with an opening is formed inside the housing body 212 for accommodating the electrode assembly 22, and the end cap 211 closes the opening. Among them, the end cap 211 is the wall portion of the battery cell 20 provided in any of the above embodiments.

[0166] The end cap 211 is the wall portion, such that when the pressure relief component 23 is opened, i.e., a part of the end cap 211 is opened, the internal pressure of the battery cell 20 can be released.

[0167] According to some embodiments of the present application, the housing 21 includes an end cap 211 and a housing body 212. An accommodation cavity with an opening is formed inside the housing body 212 for accommodating the electrode assembly 22, and the end cap 211 closes the opening. Among them, the housing body 212 includes the wall portion of the battery cell 20 provided in any of the above embodiments.

[0168] The housing body 212 includes a wall portion, such that when the pressure relief component 23 is opened, i.e., a part of the housing body 212 is opened, the internal pressure of the battery cell 20 can be released.

[0169] Refer to Figure 2 , according to some embodiments of the present application, an embodiment of the present application further provides a battery 100 including the battery cell 20 provided in any of the above embodiments.

[0170] According to some embodiments of the present application, an embodiment of the present application further provides an electrical device including the battery 100 provided in any of the above embodiments.

[0171] Please refer to Figures 3 to 11, an embodiment of the present application provides a pressure relief component 23. The pressure relief component 23 is provided with a scoring groove 231, and the scoring groove 231 extends along a closed trajectory and encloses a pressure relief area. The scoring groove 231 includes a first groove section 2311, a second groove section 2312, a third groove section 2313, and a fourth groove section 2314. The first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 are connected end to end to form a closed ring. The first groove section 2311 and the third groove section 2313 are spaced apart along the first direction X, and the second groove section 2312 and the fourth groove section 2314 are spaced apart along the second direction Y. The first groove section 2311, the second groove section 2312, the third groove section 2313, and the fourth groove section 2314 are all arc segments, and the first groove section 2311 and the third groove section 2313 are bent toward the center point of the pressure relief area, and the first groove section 2311 and the third groove section 2313 are symmetrically arranged with respect to the center point of the pressure relief area. The second groove section 2312 and the fourth groove section 2314 are bent away from the center point of the pressure relief area. And the second groove section 2312 and the fourth groove section 2314 are symmetrically arranged with respect to the center point of the pressure relief area. There is an arc transition between the first groove section 2311 and the second groove section 2312, between the second groove section 2312 and the third groove section 2313, between the third groove section 2313 and the fourth groove section 2314, and between the fourth groove section 2314 and the first groove section 2311.

[0172] The pressure relief component 23 is provided with a sunk groove 232, and the scoring groove 231 is arranged on the bottom wall of the sunk groove 232. The sunk groove 232 is arranged in a runway shape. The sunk groove 232 includes a first side wall 2321, a second side wall 2322, a third side wall 2323, and a fourth side wall 2324. The first side wall 2321 and the third side wall 2323 are flat surfaces, and the second side wall 2322 and the fourth side wall 2324 are arc surfaces. The first side wall 2321 is located outside the first groove section 2311, the second side wall 2322 is located outside the second groove section 2312, the third side wall 2323 is located outside the third groove section 2313, and the fourth side wall 2324 is located outside the fourth groove section 2314.

[0173] From both ends of the first groove section 2311 to the middle, the distance between the first groove section 2311 and the first side wall 2321 gradually increases. From both ends of the third groove section 2313 to the middle, the distance between the third groove section 2313 and the third side wall 2323 gradually increases.

[0174] Along the first direction X, the distance between the first side wall 2321 and the third side wall 2323 is W1, the maximum distance between the first groove section 2311 and the first side wall 2321 is W2, and the maximum distance between the third groove section 2313 and the third side wall 2323 is W3, satisfying 10% * W1 ≤ W2 ≤ 70% * W1, 10% * W1 ≤ W3 ≤ 70% * W1, and W2 + W3 < W1.

[0175] The first slot section 2311 includes a first sub-slot section 2311a and a second sub-slot section 2311b. The included angle between the tangent of the first sub-slot section 2311a and the first side wall 2321 is α1, and the included angle between the tangent of the second sub-slot section 2312 and the first side wall 2321 is α2, satisfying 40° ≤ α1 ≤ 80° and 40° ≤ α2 ≤ 80°.

[0176] The third slot section 2313 includes a third sub-slot section 2313a and a fourth sub-slot section 2313b. The included angle between the tangent of the third sub-slot section 2313a and the third side wall 2323 is α3, and the included angle between the tangent of the fourth sub-slot section 2313b and the third side wall 2323 is α4, satisfying 40° ≤ α3 ≤ 80° and 40° ≤ α4 ≤ 80°. For example, α3 can be 40°, 65°, 80°, etc., and α4 can be 40°, 50°, 80°, etc.

[0177] The length of the second slot section 2312 is L1, the length of the fourth slot section 2314 is L2, and the length of the notch slot 231 is L, satisfying L1 ≥ 1 / 4 * L and L2 ≥ 1 / 4 * L.

[0178] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0179] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A pressure relief component for a battery cell, characterized in that, the pressure relief component is provided with a scoring groove, the scoring groove extends along a closed trajectory and encloses a pressure relief area, the scoring groove includes a first groove section and a second groove section, both the first groove section and the second groove section are arc segments, and the first groove section bends towards the center point of the pressure relief area, and the second groove section bends away from the center point of the pressure relief area.

2. The pressure relief component according to claim 1, characterized in that, there is an arc transition between the first groove section and the second groove section.

3. The pressure relief component according to claim 1, characterized in that, the scoring groove further includes a third groove section, the third groove section is spaced from the first groove section along a first direction, the second groove section connects the first groove section and the third groove section, the third groove section is an arc segment, and the third groove section bends towards the center point of the pressure relief area.

4. The pressure relief component according to claim 3, characterized in that, the first groove section and the third groove section are symmetrically arranged with respect to the center point of the pressure relief area.

5. The pressure relief component according to claim 3, characterized in that, the scoring groove further includes a fourth groove section, the fourth groove section is spaced from the second groove section along a second direction, the first groove section, the second groove section, the third groove section and the fourth groove section are connected end to end to form a closed ring, the fourth groove section is an arc segment, and the fourth groove section bends away from the center point of the pressure relief area; the second direction intersects the first direction.

6. The pressure relief component according to claim 5, characterized in that, the second direction is perpendicular to the first direction.

7. The pressure relief component according to claim 5, characterized in that, the second groove section and the fourth groove section are symmetrically arranged with respect to the center point of the pressure relief area.

8. The pressure relief component according to claim 5, characterized in that, the pressure relief component is provided with a sinking groove, and the scoring groove is arranged on the bottom wall of the sinking groove.

9. The pressure relief component according to claim 8, characterized in that, the sinking groove is arranged in a runway shape, a circular shape or an elliptical shape.

10. The pressure relief component according to claim 5, characterized in that, the sinking groove includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall and the third side wall are planes, the second side wall and the fourth side wall are arc surfaces, the first side wall is located outside the first groove section, the second side wall is located outside the second groove section, the third side wall is located outside the third groove section, and the fourth side wall is located outside the fourth groove section.

11. The pressure relief component according to claim 10, characterized in that, from both ends of the first groove section towards the middle, the distance between the first groove section and the first side wall gradually increases; from both ends of the third groove section towards the middle, the distance between the third groove section and the third side wall gradually increases.

12. The pressure relief component according to claim 10, characterized in that, Along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove segment and the first side wall is W2, and the maximum distance between the third groove segment and the third side wall is W3, satisfying 10% * W1 ≤ W2 ≤ 70% * W1, 10% * W1 ≤ W3 ≤ 70% * W1.

13. The pressure relief component according to claim 10, wherein, along the first direction, the distance between the first side wall and the third side wall is W1, the maximum distance between the first groove segment and the first side wall is W2, and the maximum distance between the third groove segment and the third side wall is W3, satisfying W2 + W3 < W1.

14. The pressure relief component according to claim 10, wherein, the first groove segment includes a first sub - groove segment and a second sub - groove segment, the included angle between the tangent of the first sub - groove segment and the first side wall is α1, and the included angle between the tangent of the second sub - groove segment and the first side wall is α2, satisfying 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°.

15. The pressure relief component according to claim 5, wherein, the length of the second groove segment is L1, the length of the fourth groove segment is L2, and the length of the notch groove is L, satisfying L1 ≥ 1 / 4 * L, L2 ≥ 1 / 4 * L.

16. A battery cell, wherein, it includes the pressure relief component according to any one of claims 1 to 15, and the pressure relief component is configured to relieve the internal pressure of the battery cell.

17. The battery cell according to claim 16, wherein, the battery cell further includes: a housing having a wall portion; wherein, the pressure relief component is the wall portion.

18. The battery cell according to claim 16, wherein, the battery cell further includes: a housing having a wall portion with a pressure relief hole; wherein, the pressure relief component is installed on the wall portion and covers the pressure relief hole.

19. The battery cell according to claim 17 or 18, wherein, the housing includes: a housing body with an accommodating cavity having an opening formed inside, and the accommodating cavity is used to accommodate the electrode assembly; an end cap for closing the opening; wherein, the end cap is the wall portion.

20. The battery cell according to claim 17 or 18, wherein, the housing includes: a housing body with an accommodating cavity having an opening formed inside, and the accommodating cavity is used to accommodate the electrode assembly; an end cap for closing the opening; wherein, the housing body includes the wall portion.

21. A battery, wherein, it includes the battery cell according to any one of claims 16 - 20.

22. An electrical device, wherein, it includes the battery according to claim 21, and the battery is used to provide electrical energy.

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