Housing member, battery cell, battery, and electric device

Abstract

The embodiment of the invention provides a shell component, a battery monomer, a battery and electric equipment, the shell component is provided with a sinking groove, the bottom wall of the sinking groove is provided with a nick groove, the nick groove extends along a closed track in the circumferential direction of the sinking groove, and the nick groove comprises a first groove section and a second groove section, the side wall of the sinking groove comprises a first side wall located on the outer side of the first groove section and a second side wall located on the outer side of the second groove section, and the maximum distance between the first groove section and the first side wall is larger than the maximum distance between the second groove section and the second side wall. According to the present invention, when the internal pressure of the battery monomer acts on the shell component, the acting force on the first groove section is less than the acting force on the second groove section, such that the stress deformation possibility of the area enclosed by the nick groove is less, the early cracking possibility of the nick groove is less, and the service life of the battery monomer can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a housing 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 shell component, a battery cell, a battery, and an electrical device, which can reduce the possibility of premature cracking and pressure release of the notched groove of the shell component, thereby extending the service life of the battery.

[0005] In a first aspect, the present application provides a shell component for a battery cell, wherein the shell component is provided with a sink, and the bottom wall of the sink is provided with a notched groove, wherein the notched groove extends along a closed trajectory in the circumferential direction of the sink, wherein the notched groove includes a first groove segment and a second groove segment, and the side walls of the sink include a first side wall located outside the first groove segment and a second side wall located outside the second groove segment, wherein the maximum distance between the first groove segment and the first side wall is greater than the maximum distance between the second groove segment and the second side wall.

[0006] In the above technical scheme, a sink is provided in the shell component, and a notched groove is provided on the bottom wall of the sink, so that the notched groove can be opened when the internal pressure of the battery cell reaches a threshold value to release pressure, thereby reducing the possibility of thermal runaway or even explosion of the battery cell; the notched groove extends along a closed trajectory in the circumferential direction of the sink, the notched groove includes a first groove section and a second groove section, the side wall of the sink includes a first side wall located outside the first groove section and a second side wall located outside the second groove section, and the maximum distance between the first groove section and the first side wall is greater than the maximum distance between the second groove section and the second side wall, so that when the internal pressure of the battery cell acts on the shell component, the force applied to the first groove section is smaller than the force applied to the second groove section, thereby making the area enclosed by the notched groove less likely to be deformed by force, and the notched groove less likely to crack prematurely, thereby extending the service life of the battery cell.

[0007] According to some embodiments of the present application, the distance between the first slot segment and the first side wall gradually increases from both ends to the middle of the first slot segment.

[0008] In the above technical solution, by making the distance between the first groove section and the first side wall gradually increase from both ends to the middle of the first groove section, the extension of the first groove section can be made smooth, and stress concentration points are not easily formed, so that the possibility of premature cracking caused by concentrated stress on the first groove section can be reduced, and the service life of the battery cell can be extended.

[0009] According to some embodiments of the present application, the first side wall is a plane, and the second side wall is an arc surface.

[0010] In the above technical solution, by setting the first side wall as a plane, the length of the first side wall can be set to be longer, so that the area of the sinking groove is larger; by setting the second side wall as an arc surface, a larger sinking groove area can be enclosed further under the condition that the width of the sinking groove is limited, so that the area of the region enclosed by the scoring groove 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 reduces the possibility of thermal runaway or even explosion of the battery cell.

[0011] According to some embodiments of the present application, the sinking groove further includes a third side wall and a fourth side wall. The third side wall is disposed opposite to the first side wall along a first direction, and the fourth side wall is disposed opposite to the second side wall along a second direction; the first direction intersects with the second direction.

[0012] In the above technical solution, the sinking groove further includes a third side wall and a fourth side wall. The third side wall is disposed opposite to the first side wall along a first direction, and the fourth side wall is disposed opposite to the second side wall along a second direction; the first direction intersects with the second direction; this can make the side wall distribution of the sinking groove more uniform, and the force distribution on the bottom wall of the sinking groove is also more uniform. Stress concentration points are not easily formed on the scoring groove, which can reduce the possibility of premature cracking caused by concentrated stress on the scoring groove, and extend the service life of the battery cell.

[0013] According to some embodiments of the present application, the first direction is perpendicular to the second direction.

[0014] In the above technical solution, by making the first direction perpendicular to the second direction, the first side wall and the third side wall of the sinking groove, and the second side wall and the fourth side wall can be symmetrically arranged, further making the side wall distribution of the sinking groove more uniform, and the force distribution of the sinking groove is also more uniform. Stress concentration points are not easily formed on the scoring groove, which can reduce the possibility of premature cracking caused by concentrated stress on the scoring groove, and extend the service life of the battery cell.

[0015] 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, and the maximum distance between the first groove section and the first side wall is W2, satisfying 10% * W1 ≤ W2 ≤ 70% * W1.

[0016] In the above technical solution, by making the distance W1 between the first side wall and the third side wall and the maximum distance W2 between the first groove section and the first side wall satisfy 10% * W1 ≤ W2 ≤ 70% * W1 along the first direction, it is convenient to prepare the scoring groove, and the first groove section is less affected by the force inside the battery cell. Furthermore, the possibility of the area enclosed by the scoring groove 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.

[0017] According to some embodiments of the present application, the scoring groove further includes a third groove section, the third groove section is spaced from the first groove section along the first direction, the second groove section connects the first groove section and the third groove section, and the maximum distance between the third groove section and the third side wall is greater than the maximum distance between the second groove section and the second side wall.

[0018] In the above technical solution, by providing the third groove section, making the third groove section spaced from the first groove section along the first direction, the second groove section connecting the first groove section and the third groove section, and the maximum distance between the third groove section and the third side wall being greater than the maximum distance between the second groove section and the second side wall, when the internal pressure of the battery cell acts on the housing component, the force received by the third groove section is less than the force received by the second groove section. And due to the combined action of the first groove section and the third groove section, it can further make the possibility of the area enclosed by the scoring groove deforming under force smaller, the anti-deformation ability stronger, and the possibility of the scoring groove cracking in advance smaller, so that the service life of the battery cell can be extended.

[0019] 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 sunken groove.

[0020] 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 sunken groove, the force on the scoring groove can be made more uniform, the possibility of the area enclosed by the scoring groove deforming under force smaller, the anti-deformation ability stronger, and the possibility of the scoring groove cracking in advance smaller, so that the service life of the battery cell can be extended.

[0021] According to some embodiments of the present application, the scoring groove further includes a fourth groove section, the fourth groove section is spaced from the second groove section along 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 maximum distance between the first groove section and the first side wall is greater than the maximum distance between the fourth groove section and the fourth side wall.

[0022] In the above technical solution, by providing the fourth groove section such that the fourth groove section and the second groove section are spaced apart in the second direction, the distribution of the scoring grooves can be made more uniform, the possibility of stress concentration points in the scoring grooves is smaller, and the possibility of premature cracking of the scoring grooves is smaller, thereby extending the service life of the battery cell; 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, so that when thermal runaway occurs in the battery cell, the scoring grooves can be opened, and the area enclosed by the scoring grooves can be separated from other areas of the housing component to form a relatively large pressure relief channel, facilitating rapid pressure relief of the battery cell and further reducing the possibility of thermal runaway or even explosion of the battery cell; the maximum distance between the first groove section and the first side wall is greater than the maximum distance between the fourth groove section and the fourth side wall, so that the force received by the first groove section is less than the force received by the fourth groove section, and further reducing the possibility of the area enclosed by the scoring grooves deforming under force.

[0023] 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 sunken groove.

[0024] 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 sunken groove, the force on the scoring grooves can be made more uniform, the possibility of the area enclosed by the scoring grooves deforming under force is smaller, the anti-deformation ability is stronger, and the possibility of premature cracking of the scoring grooves is smaller, thereby extending the service life of the battery cell.

[0025] According to some embodiments of the present application, the depths of the first groove section, the second groove section, and the fourth groove section are greater than the depth of the third groove section.

[0026] In the above technical solution, by making the depths of the first groove section, the second groove section, and the fourth groove section greater than the depth of the third groove section, the first groove section, the second groove section, and the fourth groove section can be opened under force prior to the third groove section to form a pressure relief channel, and the area of the housing component enclosed by the scoring grooves can be kept connected to other areas, reducing the possibility of damage caused by interference with other components after the area enclosed by the scoring grooves is separated from other areas.

[0027] 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.

[0028] 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 at the connection caused by the connection of the first groove section and the third groove section and easy cracking can be reduced, and the possibility of premature cracking of the notch groove is smaller, thereby extending the service life of the battery cell.

[0029] According to some embodiments of the present application, both the first groove section and the second groove section are arc segments.

[0030] In the above technical solution, by making both the first groove section and the second groove section be arc segments, the extensions of the first groove section and the second groove section can be made smooth, and stress concentration points are not easily formed, so that the possibility of premature cracking caused by concentrated force on the first groove section and the second groove section can be reduced, and the service life of the battery cell can be extended; and the second groove section can enclose a larger area, so that a larger pressure relief channel can be formed after the notch 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.

[0031] According to some embodiments of the present application, there is an arc transition between the first groove section and the second groove section.

[0032] In the above technical solution, by making an arc transition between the first groove section and the second groove section, the transition part between the first groove section and the second groove section can be made smooth, and stress concentration points are not easily formed, so that the possibility of premature cracking caused by concentrated force on the first groove section can be reduced, and the service life of the battery cell.

[0033] 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° and 40° ≤ α2 ≤ 80°.

[0034] In the above technical solution, the first slot section includes a first sub-slot section and a second sub-slot section. By making the angle α1 between the tangent of the first sub-slot section and the first side wall, and the angle α2 between the tangent of the second sub-slot section and the first side wall satisfy 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°. On the one hand, the first slot section can be further away from the first side wall of the sinking slot, so as to further reduce the pressure inside the battery cell body received by the first slot section. On the other hand, it can reduce the corner amplitude at the connection between the first sub-slot section, the second sub-slot section and other slot sections. Furthermore, it can reduce the possibility of stress concentration points at the connection between the first sub-slot section, the second sub-slot section and other slot sections, making the area enclosed by the notch grooves less likely to be deformed under force, with stronger anti-deformation ability and less likely to crack prematurely, thus being able to extend the service life of the battery cell.

[0035] According to some embodiments of the present application, the length of the second slot section is L1, and the length of the notch groove is L, satisfying L1 ≥ 1 / 4 * L.

[0036] In the above technical solution, by making the length L1 of the second slot section and the length L of the notch groove satisfy L1 ≥ 1 / 4 * L, it can make the length of the second slot section, which is more stressed than the first slot section in the notch groove, longer. When the internal pressure of the battery cell reaches the threshold value, the second slot section is easy to open for pressure relief, and it can make the area of the pressure relief area formed by the notch groove enclosure larger. After the notch groove is stressed and opened, 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.

[0037] According to some embodiments of the present application, the housing component includes a body and a pressure relief member. A through hole is provided on the body, and the pressure relief member covers the through hole to form the sinking slot.

[0038] In the above technical solution, the housing component includes a body and a pressure relief member. A through hole is provided on the body, and the pressure relief member covers the through hole to form the sinking slot. The preparation and assembly of the body and the pressure relief member are simple, which is convenient for the formation of the sinking slot.

[0039] In a second aspect, the present application provides a battery cell including the above-mentioned housing component.

[0040] According to some embodiments of the present application, the battery cell includes a housing and an end cap. The housing has an opening, and the end cap closes the opening. The housing component is the end cap or the housing.

[0041] In the above technical solution, the housing component is the end cap or the housing, which can achieve pressure relief when the internal pressure of the battery cell reaches the threshold value, so as to reduce the possibility of thermal runaway or even explosion of the battery cell. By forming a pressure relief structure by setting a notch groove on the end cap, the pressure relief structure has good stability and good long-term reliability.

[0042] In a third aspect, the present application provides a battery, including the battery cell as described above.

[0043] In a fourth aspect, the present application provides an electrical device, including the battery as described above, where the battery is used to provide electrical energy. Description of the Drawings

[0044] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces 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 should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0045] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application;

[0046] Figure 2 is an exploded structural diagram of a battery provided by some embodiments of the present application;

[0047] Figure 3 is an exploded structural diagram of a battery cell provided by some embodiments of the present application;

[0048] Figure 4 is a three-dimensional structural diagram of a housing component provided by some embodiments of the present application;

[0049] Figure 5 is a structural diagram of a perspective of a housing component provided by some embodiments of the present application;

[0050] Figure 6 is Figure 5 a cross-sectional structural diagram of the housing component along A-A in

[0051] Figure 7 is Figure 6 a partially enlarged structural diagram at B of the housing component in

[0052] Figure 8 is a three-dimensional schematic diagram of a partial structure of a housing component provided by some embodiments of the present application;

[0053] Figure 9 is a schematic diagram of a perspective of a partial structure of a housing component provided by some embodiments of the present application;

[0054] Figure 10 is Figure 5 a partially enlarged structural diagram at C of the housing component in

[0055] Figure 11It is an exploded structural schematic diagram of a housing component provided by some embodiments of the present application.

[0056] Icons: 1000 - vehicle; 100 - battery; 10 - box body; 11 - first sub - box body; 12 - second sub - box body; 20 - battery cell; 21 - housing; 211 - end cover; 2111 - electrode terminal; 212 - housing body; 22 - electrode assembly; 221 - tab; 23 - housing component; 23a - body; 23b - pressure relief member; 231 - sink; 232 - notch groove; 2321 - first groove segment; 2321a - first sub - groove segment; 2321b - second sub - groove segment; 2322 - second groove segment; 2323 - third groove segment; 2324 - fourth groove segment; 2331 - first side wall; 2332 - second side wall; 2333 - third side wall; 2334 - fourth side wall; 234 - through hole; 200 - controller; 300 - motor; X - first direction; Y - second direction; Z - third direction. Detailed implementation manners

[0057] 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 making creative efforts belong to the scope of protection of the present application.

[0058] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0059] The terms "first", "second", etc. in the specification and claims of the present application or the above - mentioned drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0060] Referring to "embodiments" in the present application means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in 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.

[0061] The term "a plurality of" as used in the present application means two or more (including two).

[0062] The battery mentioned in the embodiments of the present application refers to a single physical module that includes multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack, etc. Generally, a battery may also include a housing for encapsulating one or more battery cells or multiple battery modules. The housing can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0063] A 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. To ensure that a large current can pass through 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.

[0064] The battery cell also includes a housing component. The housing component can be an end cap or a housing. The end cap closes the opening of the housing to define an accommodation space for accommodating the electrode assembly.

[0065] The battery has outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient, and is an important part of the development of new energy today. With the development of the new energy industry, the battery is 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 and discharge rate, etc. In addition, the service life of the battery also needs to be considered.

[0066] 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 outer shell of the battery cell. However, during the charge and discharge process of the battery cell, the internal pressure changes, and the area around the scoring groove is prone to deformation 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 prone to repeated deformation, resulting in the area around the scoring groove being in a state of breathing fatigue for a long time, being prone to premature cracking, and then causing the battery cell to leak liquid, affecting the normal charge and discharge of the battery cell and shortening the service life of the battery cell.

[0067] Based on the above considerations, the present application provides a housing component for a battery cell. The housing component is provided with a sunk groove, and a scoring groove is provided on the bottom wall of the sunk groove. In the circumferential direction of the sunk groove, the scoring groove extends along a closed track. The scoring groove includes a first groove section and a second groove section. The side wall of the sunk groove includes a first side wall located outside the first groove section and a second side wall located outside the second groove section. The maximum distance between the first groove section and the first side wall is greater than the maximum distance between the second groove section and the second side wall.

[0068] In the technical solution of the present application, by providing a sunk groove in the housing component and a scoring groove on the bottom wall of the sunk groove, the scoring groove can be opened when the internal pressure of the battery cell reaches a threshold value for pressure relief, reducing the possibility of thermal runaway and even explosion of the battery cell; by making the scoring groove extend along a closed track in the circumferential direction of the sunk groove, the scoring groove includes a first groove section and a second groove section, the side wall of the sunk groove includes a first side wall located outside the first groove section and a second side wall located outside the second groove section, and the maximum distance between the first groove section and the first side wall is greater than the maximum distance between the second groove section and the second side wall. Since when the housing component is stressed, the connection between the bottom wall and the side wall of the sunk groove is more prone to deformation and the stress is more concentrated, and the stress will extend from the connection between the bottom wall and the side wall to the middle of the bottom wall, the stress on the part of the bottom wall of the sunk groove that is farther away from the side wall is smaller. When the internal pressure of the battery cell acts on the housing component, the acting force on the first groove section is less than the acting force on the second groove section, further reducing the possibility of the area enclosed by the scoring groove deforming under force and the possibility of the scoring groove cracking prematurely, thus extending the service life of the battery cell; and the second groove section is close to the second side wall, enabling the area of the pressure relief area formed by enclosing the scoring groove to be larger. After the scoring 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 and even explosion of the battery cell.

[0069] The battery cell disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships, or aircraft. The power system of the power-consuming device can be composed of the battery disclosed in the present application.

[0070] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device 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, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0071] The battery described in the embodiments of the present application is not only limited to being applicable to the power-consuming devices described above, but can also be applicable to all power-consuming devices that want to use a battery. For the sake of brevity of description, the following embodiments will be described by taking a vehicle as an example of a power-consuming device.

[0072] Please refer to Figure 1 , Figure 1 which is a schematic 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, or 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 for power supply of the vehicle 1000. For example, the battery 100 can be used 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 consumption requirements during the start, navigation, and operation of the vehicle 1000.

[0073] 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 consumption requirements during the start, navigation, and driving of the vehicle 1000.

[0074] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of the vehicle 1000, but also be used 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.

[0075] Please refer to Figure 2 , Figure 2Explosion structure schematic diagram of the battery provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and 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 cover each other, 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 may be a hollow structure with one end open, the second sub-box body 12 may be a plate-like structure, and 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 an accommodation space; the first sub-box body 11 and the second sub-box body 12 may 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.

[0076] In some embodiments, the box body 10 may be a cuboid.

[0077] In some other embodiments, the box body 10 may also be a cylinder.

[0078] In some embodiments, the box body 10 may be made of aluminum, aluminum alloy or other metal materials, so that the box body 10 has high mechanical properties.

[0079] In some other embodiments, the box body 10 may also be a non-metallic material with high strength such as carbon fiber and hard plastic.

[0080] In the battery 100, there may 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 may further include other structures. For example, the battery 100 may further include a busbar component for realizing electrical connection among the multiple battery cells 20.

[0081] Among them, the battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0082] Please refer to Figure 3 , Figure 3 Explosion structure schematic diagram of the battery cell provided by some embodiments of the present application. As Figure 3As shown, the battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components.

[0083] 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.

[0084] 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 subjected to extrusion and collision, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 2111 can be provided on the end cap 211. The electrode terminals 2111 can be used for electrical connection with the electrode assembly 22 to output or input the electrical 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 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.

[0085] The housing body 212 is a component used to cooperate 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, electrolyte, and other components. The housing body 212 and the end cap 211 can be independent components. The housing body 212 can be of various shapes and sizes. Specifically, the shape of the housing body 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing body 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0086] In some embodiments, the housing body 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 body 212.

[0087] In some other embodiments, both the end cap 211 and the housing body 212 can be hollow structures with an opening on one side. The opening side of the end cap 211 covers the opening side of the housing body 212 to jointly form an accommodation space.

[0088] In some embodiments, the end cap 211 and the housing body 212 can be connected by welding.

[0089] In some other embodiments, the end cap 211 and the housing body 212 can also be fixedly connected by bonding, interference fit, etc.

[0090] In some embodiments, the battery cell 20 can be in the shape of a cuboid, such that a plurality of battery cells 20 can be closely arranged in a matrix, which is beneficial to improving the energy density of the battery 100.

[0091] In other embodiments, the battery cell 20 can also be in the shape of a flat body, a cylinder or other shapes.

[0092] 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 generally, 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 avoid 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 having active materials constitute the main body of the electrode assembly 22, and the parts of the positive electrode plate and the negative electrode plate without active materials 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 charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs 221 are connected to the electrode terminals 2111 to form a current loop.

[0093] Please refer to Figures 4 to 8 , Figure 4 the three-dimensional structural schematic diagram of the housing component provided by some embodiments of the present application; Figure 5 the structural schematic diagram of one perspective of the housing component provided by some embodiments of the present application; Figure 6 is Figure 5 the cross-sectional structural schematic diagram of the housing component along A-A in Figure 7 is Figure 6 the partial enlarged structural schematic diagram of the B position of the housing component in Figure 8 the three-dimensional schematic diagram of the partial structure of the housing component provided by some embodiments of the present application.

[0094] Some embodiments of the present application provide a housing component 23 for the battery cell 20. The housing component 23 is provided with a sunk groove 231, and a scoring groove 232 is provided on the bottom wall of the sunk groove 231. In the circumferential direction of the sunk groove 231, the scoring groove 232 extends along a closed track. The scoring groove 232 includes a first groove section 2321 and a second groove section 2322. The side wall of the sunk groove 231 includes a first side wall 2331 located outside the first groove section 2321 and a second side wall 2332 located outside the second groove section 2322. The maximum distance between the first groove section 2321 and the first side wall 2331 is greater than the maximum distance between the second groove section 2322 and the second side wall 2332.

[0095] The notch grooves 232 enclose a pressure relief area. The outside of the first groove section 2321 refers to the side of the first groove section 2321 facing away from the center of the pressure relief area. The outside of the second groove section 2322 refers to the side of the second groove section 2322 facing away from the center of the pressure relief area.

[0096] Wherein, the distance between the first groove section 2321 and the first side wall 2331 is the distance between the first groove section 2321 and the first side wall 2331 along the first direction X. The distance between the second groove section 2322 and the second side wall 2332 is the distance between the second groove section 2322 and the second side wall 2332 along the second direction Y.

[0097] The housing component 23 is a component that constitutes the housing of the battery cell 20.

[0098] The sinking groove 231 is a pressure relief structure of the housing component 23. The thickness of the housing component 23 at the sinking groove 231 is thinner than that of other parts of the housing component 23, so that when the battery cell 20 constituted by the housing component 23 is in thermal runaway, it ruptures at the notch grooves 232 of the sinking groove 231 to release the pressure inside the battery cell 20.

[0099] The bottom wall of the sinking groove 231 is disposed opposite to the opening of the sinking groove 231. The side wall of the sinking groove 231 refers to the wall of the sinking groove 231 surrounding the bottom wall.

[0100] By providing a counterbore 231 in the outer shell member 23 and providing a scoring groove 232 in the bottom wall of the counterbore 231, the scoring groove 232 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. By making the scoring groove 232 extend along a closed trajectory in the circumferential direction of the counterbore 231, the scoring groove 232 includes a first groove section 2321 and a second groove section 2322, the side wall of the counterbore 231 includes a first side wall 2331 located outside the first groove section 2321 and a second side wall 2332 located outside the second groove section 2322, and the maximum distance between the first groove section 2321 and the first side wall 2331 is greater than the maximum distance between the second groove section 2322 and the second side wall 2332. Since when the outer shell member 23 is stressed, the connection between the bottom wall and the side wall of the counterbore 231 is more likely to deform, the stress is more concentrated, and the stress will extend from the connection between the bottom wall and the side wall to the middle of the bottom wall. Therefore, the stress on the part of the bottom wall of the counterbore farther from the side wall is smaller. When the internal pressure of the battery cell 20 acts on the outer shell member 23, the acting force on the first groove section 2321 is less than the acting force on the second groove section 2322. Furthermore, the possibility of the area enclosed by the scoring groove 232 deforming under force is smaller, and the possibility of the scoring groove 232 cracking in advance is smaller, so that the service life of the battery cell 20 can be extended; and the second groove section 2322 is close to the second side wall 2332, which can make the area of the pressure relief area formed by enclosing the scoring groove 232 larger. After the scoring groove 232 is opened under force, a larger pressure relief channel can be formed, which is convenient for realizing 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.

[0101] Please also refer to Figure 9 , Figure 9 which is a schematic diagram of a perspective view of a partial structure of an outer shell member provided in some embodiments of the present application.

[0102] According to some embodiments of the present application, from both ends of the first groove section 2321 to the middle, the distance between the first groove section 2321 and the first side wall 2331 gradually increases.

[0103] By making the distance between the first groove section 2321 and the first side wall 2331 gradually increase from both ends of the first groove section 2321 to the middle, the extension of the first groove section 2321 can be made smooth and stress concentration points are not easily formed, so that the possibility of the first groove section 2321 cracking in advance due to concentrated stress can be reduced, and the service life of the battery cell 20 can be extended.

[0104] In some other embodiments, from both ends of the first groove section 2321 towards the middle, the distance between the first groove section 2321 and the first side wall 2331 can also gradually increase in part and remain unchanged in part, that is, the first groove section 2321 can extend partially away from the first side wall 2331 and partially along a direction parallel to the first side wall 2331.

[0105] In some other embodiments, it is also possible to gradually increase the distance between the first groove section 2321 and the first side wall 2331 from one end of the first groove section 2321 towards the middle, and the distance between the other end of the first groove section 2321 and the first side wall 2331 remains unchanged.

[0106] According to some embodiments of the present application, the first side wall 2331 is a flat surface, and the second side wall 2332 is an arc surface.

[0107] Since the housing component 23 provided in some embodiments of the present application is rectangular, the width of the housing component 23 along the first direction X is relatively narrow, while the length along the second direction Y is relatively long, such that the dimension of the sinking groove 231 provided on the housing component 23 along the first direction X is limited, while the dimension along the second direction Y can be set relatively large. Therefore, by setting the first side wall 2331 as a flat surface, the length of the first side wall 2331 can be set relatively long, such that the area of the sinking groove 231 is relatively large. By setting the second side wall 2332 as an arc surface, it is possible to further enclose a larger sinking groove area under the condition that the width of the sinking groove 231 along the first direction X is limited, so that the area of the region enclosed by the scoring groove 232 is also relatively large. After the scoring groove 232 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.

[0108] In some other embodiments, the first side wall 2331 can also be an arc surface, and the second side wall 2332 can also be a flat surface.

[0109] According to some embodiments of the present application, the sinking groove 231 further includes a third side wall 2333 and a fourth side wall 2334. The third side wall 2333 is disposed opposite to the first side wall 2331 along the first direction X, and the fourth side wall 2334 is disposed opposite to the second side wall 2332 along the second direction; the first direction X intersects with the second direction Y.

[0110] By making the third side wall 2333 disposed opposite to the first side wall 2331 along the first direction X and the fourth side wall 2334 disposed opposite to the second side wall 2332 along the second direction Y, the side wall distribution of the sinking groove 231 can be made more uniform, and the force distribution on the bottom wall of the sinking groove 231 is also more uniform. Stress concentration points are not likely to appear in the scoring groove 232, and the possibility of premature cracking caused by concentrated force on the scoring groove 232 can be reduced, extending the service life of the battery cell 20.

[0111] According to some embodiments of the present application, the first direction X is perpendicular to the second direction Y.

[0112] By making the first direction X perpendicular to the second direction Y, the first side wall 2331 and the third side wall 2333 of the sinking groove 231, and the second side wall 2332 and the fourth side wall 2334 can be symmetrically arranged. Further, the side wall distribution of the sinking groove 231 is more uniform, and the force distribution of the sinking groove 231 is also more uniform. Stress concentration points are not likely to appear in the scoring groove 232, which can reduce the possibility of premature cracking caused by concentrated force on the scoring groove 232 and extend the service life of the battery cell 20.

[0113] 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 housing member 23, the second direction Y is parallel to the length direction of the housing member 23, and the third direction Z is parallel to the thickness direction of the housing member 23.

[0114] Please refer to Figure 10 , Figure 10 for Figure 5 the partial enlarged structural schematic diagram of the C position of the housing member in

[0115] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2331 and the third side wall 2333 is W1, and the maximum distance between the first groove segment 2321 and the first side wall 2331 is W2, satisfying 10% * W1 ≤ W2 ≤ 70% * W1. For example, W2 can be 10% * W1, 40% * W1, or 70% * W1, etc.

[0116] By making the distance W1 between the first side wall 2331 and the third side wall 2333, and the maximum distance W2 between the first groove segment 2321 and the first side wall 2331 along the first direction X satisfy 10% * W1 ≤ W2 ≤ 70% * W1, it is convenient to prepare the scoring groove 232, and the force on the first groove segment 2321 from the inside of the battery cell 20 is small. Furthermore, the possibility of the area enclosed by the scoring groove 232 deforming under force is smaller, and the improvement of the anti-deformation ability is more obvious. The possibility of premature cracking of the scoring groove 232 is smaller, so as to extend the service life of the battery cell 20.

[0117] According to some embodiments of the present application, the scoring groove 232 further includes a third groove segment 2323. The third groove segment 2323 and the first groove segment 2321 are arranged at intervals along the first direction X. The second groove segment 2322 connects the first groove segment 2321 and the third groove segment 2323. The maximum distance between the third groove segment 2323 and the third side wall 2333 is greater than the maximum distance between the second groove segment 2322 and the second side wall 2332.

[0118] Among them, the distance between the third groove section 2323 and the third side wall 2333 is the distance between the third groove section 2323 and the third side wall 2333 along the first direction X.

[0119] By providing the third groove section 2323 and arranging the third groove section 2323 at an interval from the first groove section 2321 along the first direction X, connecting the second groove section 2322 between the first groove section 2321 and the third groove section 2323, and making the maximum distance between the third groove section 2323 and the third side wall 2333 greater than the maximum distance between the second groove section 2322 and the second side wall 2332, when the internal pressure of the battery cell 20 acts on the housing component 23, the force received by the third groove section 2323 can be made less than the force received by the second groove section 2322. Moreover, due to the combined action of the first groove section 2321 and the third groove section 2323, the possibility of the area enclosed by the notch groove 232 deforming under force can be further reduced, the anti-deformation ability can be enhanced, and the possibility of the notch groove 232 cracking in advance can be reduced, thereby extending the service life of the battery cell 20.

[0120] According to some embodiments of the present application, from both ends of the third groove section 2323 towards the middle, the distance between the third groove section 2323 and the third side wall 2333 gradually increases.

[0121] By making the distance between the third groove section 2323 and the third side wall 2333 gradually increase from both ends of the third groove section 2323 towards the middle, the extension of the third groove section 2323 can be made smooth, and stress concentration points are not easily formed, thereby reducing the possibility of premature cracking caused by concentrated force on the third groove section 2323 and extending the service life of the battery cell 20.

[0122] In some other embodiments, from both ends of the third groove section 2323 towards the middle, part of the distance between the third groove section 2323 and the third side wall 2333 can gradually increase and part can remain unchanged, that is, the third groove section 2323 can extend partially away from the third side wall 2333 and partially along a direction parallel to the third side wall 2333.

[0123] In some other embodiments, it is also possible that from one end of the third groove section 2323 towards the middle, the distance between the third groove section 2323 and the third side wall 2333 gradually increases, and the distance between the other end of the third groove section 2323 and the third side wall 2333 remains unchanged.

[0124] According to some embodiments of the present application, the third side wall 2333 is a plane.

[0125] Since the housing component 23 provided in some embodiments of the present application is rectangular, the width of the housing component 23 along the first direction X is relatively narrow, while the length along the second direction Y is relatively long, such that the dimension of the sinking groove 231 provided on the housing component 23 along the first direction X is limited, while the dimension along the second direction Y can be set relatively large. Therefore, by setting the third side wall 2333 as a plane, the length of the third side wall 2333 can be set relatively long, such that the area of the sinking groove 231 is relatively large, so that the area of the region enclosed by the scoring groove 232 is also relatively large. After the scoring groove 232 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.

[0126] In some other embodiments, the third side surface 2333 can also be an arc surface.

[0127] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2331 and the third side wall 2333 is W1, and the maximum distance between the third groove section 2323 and the third side wall 2333 is W3, satisfying 10% * W1 ≤ W3 ≤ 70% * W1. For example, W3 can be 10% * W1, 40% * W1, or 70% * W1, etc.

[0128] By making the distance W1 between the first side wall 2331 and the third side wall 2333 along the first direction X, and the maximum distance W3 between the third groove section 2323 and the third side wall 2333 satisfy 10% * W1 ≤ W3 ≤ 70% * W1, it is convenient for the preparation of the scoring groove 232, and the force applied to the third groove section 2323 by the interior of the battery cell 20 is relatively small. Furthermore, the possibility of the region enclosed by the scoring groove 232 deforming under force is smaller, the improvement in the anti-deformation ability is more obvious, and the possibility of the scoring groove 232 cracking in advance is smaller, thereby being able to extend the service life of the battery cell 20.

[0129] According to some embodiments of the present application, the first groove section 2321 and the third groove section 2323 are symmetrically arranged with respect to the center point of the sinking groove 231.

[0130] The center point of the sinking groove 231 can be the geometric center point of the bottom wall of the sinking groove 231.

[0131] By making the first groove section 2321 and the third groove section 2323 symmetrically arranged with respect to the center point of the sinking groove 231, the force on the scoring groove 232 can be made more uniform, the possibility of the region enclosed by the scoring groove 232 deforming under force is smaller, the anti-deformation ability is stronger, and the possibility of the scoring groove 232 cracking in advance is smaller, thereby being able to extend the service life of the battery cell 20.

[0132] According to some embodiments of the present application, the scoring groove 232 further includes a fourth groove segment 2324, and the fourth groove segment 2324 and the second groove segment 2322 are spaced apart along the second direction Y.

[0133] By providing the fourth groove segment 2324 such that the fourth groove segment 2324 and the second groove segment 2322 are spaced apart along the second direction, the distribution of the scoring groove 232 can be made more uniform, the possibility of stress concentration points in the scoring groove 232 is smaller, and the possibility of premature cracking of the scoring groove 232 is smaller, thereby being able to extend the service life of the battery cell 20.

[0134] According to some embodiments of the present application, the first groove segment 2321, the second groove segment 2322, the third groove segment 2323, and the fourth groove segment 2324 are connected end to end to form a closed ring.

[0135] By making the first groove segment 2321, the second groove segment 2322, the third groove segment 2323, and the fourth groove segment 2324 connected end to end to form a closed ring, when thermal runaway occurs in the battery cell 20, the scoring groove 232 can be opened, and the area enclosed by the scoring groove 232 can be separated from other areas of the housing member 23 to form a pressure relief channel with a relatively large area, 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.

[0136] According to some embodiments of the present application, the maximum distance between the first groove segment 2321 and the first side wall 2331 is greater than the maximum distance between the fourth groove segment 2324 and the fourth side wall 2334.

[0137] Wherein, the distance between the fourth groove segment 2324 and the fourth side wall 2334 is the distance along the first direction X between the fourth groove segment 2324 and the fourth side wall 2334.

[0138] By making the maximum distance between the first groove segment 2321 and the first side wall 2331 greater than the maximum distance between the fourth groove segment 2324 and the fourth side wall 2334, the force received by the first groove segment 2321 is less than the force received by the fourth groove segment 2324, and further the possibility of the area enclosed by the scoring groove 232 deforming under force is smaller.

[0139] According to some embodiments of the present application, the fourth side wall 2334 is an arc surface.

[0140] Since the housing component 23 provided in some embodiments of the present application is rectangular, the width of the housing 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 231 provided on the housing component 23 along the first direction X. Therefore, by setting the fourth side wall 2334 as an arc surface, it is possible to further enclose a larger sinking groove area under the condition that the width of the sinking groove 231 along the first direction X is limited, so that the area of the region enclosed by the scoring groove 232 is also relatively large. After the scoring groove 232 is forced to open, 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.

[0141] In some other embodiments, the fourth side wall 2334 can also be a plane.

[0142] According to some embodiments of the present application, the second groove section 2322 and the fourth groove section 2324 are symmetrically arranged with respect to the center point of the sinking groove 231.

[0143] By making the second groove section 2322 and the fourth groove section 2324 symmetrically arranged with respect to the center point of the sinking groove 231, the force on the scoring groove 232 can be made more uniform, the possibility of the region enclosed by the scoring groove 232 deforming under force is smaller, the anti-deformation ability is stronger, and the possibility of the scoring groove 232 cracking in advance is smaller, thereby extending the service life of the battery cell 20.

[0144] According to some embodiments of the present application, the depths of the first groove section 2321, the second groove section 2322, and the fourth groove section 2324 are greater than the depth of the third groove section 2323.

[0145] The depth of the scoring groove 232 is the dimension of the scoring groove 232 in the third direction Z.

[0146] By making the depths of the first groove section 2321, the second groove section 2322, and the fourth groove section 2324 greater than the depth of the third groove section 2323, it is possible to make the first groove section 2321, the second groove section 2322, and the fourth groove section 2324 open under force to form a pressure relief channel prior to the second groove section 2322, and to keep the region enclosed by the scoring groove 232 of the housing component 23 connected to other regions, reducing the possibility of interference and damage with other components after the region enclosed by the scoring groove 232 is separated from other regions.

[0147] In some other embodiments, it can also be that the depths of three other groove sections among the first groove section 2321, the second groove section 2322, the third groove section 2323, and the fourth groove section 2324 are greater than the depth of the other groove section. For example, the depths of the first groove section 2321, the second groove section 2322, and the third groove section 2323 are greater than the depth of the fourth groove section 2324.

[0148] In some other embodiments, the depth of two connected slot segments among the first slot segment 2321, the second slot segment 2322, the third slot segment 2323, and the fourth slot segment 2324 can be greater than that of the other two slot segments. For example, the depth of the first slot segment 2321 and the second slot segment 2322 is greater than that of the third slot segment 2323 and the fourth slot segment 2324.

[0149] In some other embodiments, the depth of one slot segment among the first slot segment 2321, the second slot segment 2322, the third slot segment 2323, and the fourth slot segment 2324 can be greater than that of the other three slot segments. For example, the depth of the first slot segment 2321 is greater than that of the second slot segment 2322, the third slot segment 2323, and the fourth slot segment 2324.

[0150] In some other embodiments, the depths of multiple slot segments that are greater than those of other slot segments can be the same or different. For example, when the depths of the first slot segment 2321, the second slot segment 2322, and the fourth slot segment 2324 are greater than that of the third slot segment 2323, the depths of the first slot segment 2321, the second slot segment 2322, and the fourth slot segment 2324 can also be different. For example, the depth of the first slot segment 2321 is greater than that of the fourth slot segment 2324, and the depth of the second slot segment 2322 is greater than that of the first slot segment 2321, such that the second slot segment 2322, the first slot segment 2321, the fourth slot segment 2324, and the third slot segment 2323 can be opened in sequence when the internal pressure of the battery cell 20 reaches the threshold, and the greater the internal pressure of the battery cell 20, the more the number of opened slot segments, the larger the area of the pressure relief channel formed, and the faster the pressure relief speed.

[0151] According to some embodiments of the present application, along the first direction X, the distance between the first side wall 2331 and the third side wall 2333 is W1, the maximum distance between the first slot segment 2321 and the first side wall 2331 is W2, and the maximum distance between the third slot segment 2323 and the third side wall 2333 is W3, satisfying W2 + W3 < W1.

[0152] By making the distance W1 between the first side wall 2331 and the third side wall 2333, the maximum distance W2 between the first slot segment 2321 and the first side wall 2331, and the maximum distance W3 between the third slot segment 2323 and the third side wall 2333 along the first direction X satisfy W2 + W3 < W1, the first slot segment 2321 and the third slot segment 2323 are not connected, thereby being able to reduce the problem of stress concentration and easy cracking at the connection caused by the connection of the first slot segment 2321 and the third slot segment 2323, and the possibility of the scoring groove 232 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, both the first slot segment 2321 and the second slot segment 2322 are arc segments.

[0154] By making both the first slot section 2321 and the second slot section 2322 arc segments, the extensions of the first slot section 2321 and the second slot section 2322 can be made smooth, and stress concentration points are not easily formed. Thus, the possibility of premature cracking caused by concentrated stress on the first slot section 2321 and the second slot section 2322 can be reduced, and the service life of the battery cell 20 can be extended; and the second slot section 2322 can enclose a larger area, so that a larger pressure relief channel can be formed after the notch groove 232 is forced to open, 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.

[0155] According to some embodiments of the present application, both the third slot section 2323 and the fourth slot section 2324 are arc segments.

[0156] By making both the third slot section 2323 and the fourth slot section 2324 arc segments, the extensions of the third slot section 2323 and the fourth slot section 2324 can be made smooth, and stress concentration points are not easily formed. Thus, the possibility of premature cracking caused by concentrated stress on the third slot section 2323 and the fourth slot section 2324 can be reduced, and the service life of the battery cell 20 can be extended; and the fourth slot section 2324 can enclose a larger area, so that a larger pressure relief channel can be formed after the notch groove 232 is forced to open, 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.

[0157] According to some embodiments of the present application, there is an arc transition between the first slot section 2321 and the second slot section 2322.

[0158] By making an arc transition between the first slot section 2321 and the second slot section 2322, the transition part between the first slot section 2321 and the second slot section 2322 can be made smooth, and stress concentration points are not easily formed. Thus, the possibility of premature cracking caused by concentrated stress on the first slot section 2321 can be reduced, and the service life of the battery cell 20 can be extended.

[0159] According to some embodiments of the present application, there are arc transitions between the second slot section 2322 and the third slot section 2323, between the third slot section 2323 and the fourth slot section 2324, and between the fourth slot section 2324 and the first slot section 2321, which can make the transition parts between adjacent slot sections smooth, and stress concentration points are not easily formed. Thus, the possibility of premature cracking caused by concentrated stress on each slot section can be reduced, and the service life of the battery cell 20 can be extended.

[0160] According to some embodiments of the present application, the first groove section 2321 includes a first sub-groove section 2321a and a second sub-groove section 2321b. The included angle between the tangent of the first sub-groove section 2321a and the first side wall 2331 is α1, and the included angle between the tangent of the second sub-groove section 2321b and the first side wall 2331 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.

[0161] By making the included angle α1 between the tangent of the first sub-groove section 2321a and the first side wall 2331 and the included angle α2 between the tangent of the second sub-groove section 2321b and the first side wall 2331 satisfy 40° ≤ α1 ≤ 80°, 40° ≤ α2 ≤ 80°. On the one hand, the first groove section 2321 can be further away from the first side wall 2331 of the sinking groove 231, so as to further reduce the pressure inside the battery cell on the first groove section 2321. On the other hand, it can reduce the corner amplitude at the connection between the first sub-groove section 2321a, the second sub-groove section 2321b and other groove sections. Furthermore, it can reduce the possibility of stress concentration points at the connection between the first sub-groove section 2321a, the second sub-groove section 2321b and other groove sections, making the possibility of the area enclosed by the notch groove 232 deforming under force smaller, with stronger anti-deformation ability and smaller possibility of the notch groove 232 cracking in advance, thereby extending the service life of the battery cell 20.

[0162] According to some embodiments of the present application, the third groove section 2323 includes a third sub-groove section 2323a and a fourth sub-groove section 2323b. The included angle between the tangent of the third sub-groove section 2323a and the third side wall 2333 is α3, and the included angle between the tangent of the fourth sub-groove section 2323b and the third side wall 2333 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.

[0163] By making the included angle α3 between the tangent of the third sub-groove segment 2323a and the third side wall 2333, and the included angle α4 between the tangent of the fourth sub-groove segment 2323b and the third side wall 2333 satisfy 40° ≤ α3 ≤ 80° and 40° ≤ α4 ≤ 80°, on the one hand, the third groove segment 2323 can be made to be further away from the third side wall 2333 of the sinking groove 231, so as to further reduce the pressure inside the battery cell on the third groove segment 2323; on the other hand, the corner amplitude at the connection between the third sub-groove segment 2323a, the fourth sub-groove segment 2323b and other groove segments can be reduced, and further, the possibility of generating stress concentration points at the connections between the third sub-groove segment 2323a, the fourth sub-groove segment 2323b and other groove segments can be reduced, making the possibility of the area enclosed by the notch groove 232 deforming under force smaller, with stronger anti-deformation ability and smaller possibility of the notch groove 232 cracking in advance, thereby being able to extend the service life of the battery cell 20.

[0164] According to some embodiments of the present application, the length of the second groove segment 2322 is L1, and the length of the notch groove 232 is L, satisfying L1 ≥ 1 / 4 * L. For example, L1 can be 1 / 4 * L, 1 / 3 * L, 2 / 5 * L, etc.

[0165] By making the length L1 of the second groove segment 2322 and the length L of the notch groove 232 satisfy L1 ≥ 1 / 4 * L, it can be ensured that the length of the second groove segment 2322, which is more stressed than the first groove segment 2321 in the notch groove 232, is longer. When the internal pressure of the battery cell 20 reaches the threshold value, the second groove segment 2322 is easily opened for pressure relief, and the area of the pressure relief area formed by enclosing the notch groove 232 is larger. After the notch groove 232 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.

[0166] According to some embodiments of the present application, the length of the fourth groove segment 2324 is L2, and the length of the notch groove 232 is L, satisfying L2 ≥ 1 / 4 * L. For example, L2 can be 1 / 4 * L, 1 / 3 * L, 2 / 5 * L, etc.

[0167] By making the length L2 of the fourth groove segment 2324 and the length L of the notch groove 232 satisfy L2 ≥ 1 / 4 * L, it can be ensured that the length of the fourth groove segment 2324, which is more stressed than the first groove segment 2321 and the third groove segment 2323 in the notch groove 232, is longer. When the internal pressure of the battery cell 20 reaches the threshold value, the fourth groove segment 2324 is easily opened for pressure relief, and the possibility of thermal runaway or even explosion of the battery cell 20 can be reduced.

[0168] See Figure 11 , Figure 11 is an exploded structural schematic diagram of the housing component provided by some embodiments of the present application.

[0169] According to some embodiments of the present application, the housing member 23 includes a body 23a and a pressure relief member 23b. A through hole 234 is provided on the body 23a, and the pressure relief member 23b covers the through hole 234 to form a sunk groove 231. The preparation and assembly of the body 23a and the pressure relief member 23b are simple, facilitating the formation of the sunk groove 231.

[0170] In some other embodiments, the body 23a and the pressure relief member 23b can also be integrally formed. The sunk groove 231 can be formed by the side of the housing member 23 facing away from the electrode assembly 22 recessing towards the electrode assembly 22. This can make the connection strength between the body 23a and the pressure relief member 23b greater, and the pressure relief member 23b is not easily separated from the body 23a when the battery cell 20 does not undergo thermal runaway, thereby extending the service life of the battery cell 20.

[0171] In some other embodiments, the sunk groove 231 can be formed by the side of the housing member 23 facing the electrode assembly 22 recessing away from the electrode assembly 22.

[0172] Please refer to Figure 3 and Figure 4 , according to some embodiments of the present application, the embodiments of the present application also provide a battery cell 20, including the housing member 23 provided in any of the above embodiments.

[0173] According to some embodiments of the present application, the battery cell 20 includes a housing 212 and an end cap 211. The housing 212 has an opening, and the end cap 211 closes the opening. The housing member 23 is the end cap 211.

[0174] The housing member 23 being the end cap 211 can achieve pressure relief when the internal pressure of the battery cell 20 reaches a threshold value, reducing the possibility of the battery cell 20 undergoing thermal runaway or even explosion. By forming a scoring groove 232 on the end cap 211 to form a pressure relief structure, the pressure relief structure has good stability and good long-term reliability.

[0175] According to some embodiments of the present application, the sunk groove 231 is provided on the side of the end cap 211 facing away from the electrode assembly 22, that is, the opening of the sunk groove 231 faces away from the electrode assembly 22.

[0176] In some other embodiments, the sunk groove 231 can also be provided on the side of the end cap 211 facing the electrode assembly 22, that is, the opening of the sunk groove 231 faces the electrode assembly 22.

[0177] In some other embodiments, the housing member 23 can also be the housing 212. The housing 212 includes a plurality of wall portions, and the plurality of wall portions together define an accommodation space for accommodating the electrode assembly 22 of the battery cell 20. The sunk groove 231 is provided on at least one of the plurality of wall portions.

[0178] In the housing 212, the sinking groove 231 can be provided on one wall portion or on multiple wall portions.

[0179] In some other embodiments, a plurality of sinking grooves 231 and scoring grooves 232 can also be provided on the end cap 211 or on one wall portion of the housing 212.

[0180] In the above solution, the outer shell component 23 not only has the function of accommodating the electrode assembly 22 but also has the function of relieving pressure.

[0181] Refer to Figure 2 According to some embodiments of the present application, the embodiments of the present application further provide a battery 100, including the battery cell 20 provided in any one of the above embodiments.

[0182] According to some embodiments of the present application, the embodiments of the present application further provide an electrical device, including the battery 100 provided in any one of the above embodiments.

[0183] The electrical device can be any of the above devices using the battery.

[0184] According to some embodiments of the present application, please refer to Figures 3 to 11 The embodiments of the present application provide an outer shell component 23. The outer shell component 23 is provided with a sinking groove 231, and a scoring groove 232 is provided on the bottom wall of the sinking groove 231. In the circumferential direction of the sinking groove 231, the scoring groove 232 extends along a closed track. The scoring groove 232 includes a first groove segment 2321, a second groove segment 2322, a third groove segment 2323, and a fourth groove segment 2324. The first groove segment 2321 and the third groove segment 2323 are spaced apart along the first direction X and are symmetric with respect to the center point of the sinking groove 231; the second groove segment 2322 and the fourth groove segment 2324 are spaced apart along the second direction Y and are symmetric with respect to the center point of the sinking groove 231.

[0185] The side wall of the sinking groove 231 includes a first side wall 2331 located outside the first groove segment 2321, a second side wall 2332 located outside the second groove segment 2322, a third side wall 2333 located outside the third groove segment 2323, and a fourth side wall 2334 located outside the fourth groove segment 2324. The first side wall 2331 and the third side wall 2333 are oppositely arranged along the first direction X, and the second side wall 2332 and the fourth side wall 2334 are oppositely arranged along the second direction Y.

[0186] The maximum distance between the first groove segment 2321 and the first side wall 2331 is greater than the maximum distance between the second groove segment 2322 and the second side wall 2332, and the maximum distance between the fourth groove segment 2324 and the fourth side wall 2334. The maximum distance between the third groove segment 2323 and the third side wall 2333 is greater than the maximum distance between the second groove segment 2322 and the second side wall 2332, and the maximum distance between the fourth groove segment 2324 and the fourth side wall 2334.

[0187] From both ends of the first groove section 2321 towards the middle, the distance between the first groove section 2321 and the first side wall 2331 gradually increases; from both ends of the third groove section 2323 towards the middle, the distance between the third groove section 2323 and the third side wall 2333 gradually increases.

[0188] The first side wall 2331 and the third side wall 2333 are flat surfaces, and the second side wall 2332 and the fourth side wall 2334 are arc-shaped surfaces. The first groove section 2321, the second groove section 2322, the third groove section 2323, and the fourth groove section 2324 are all arc segments. Between the first groove section 2321 and the second groove section 2322, between the second groove section 2322 and the third groove section 2323, between the third groove section 2323 and the fourth groove section 2324, and between the fourth groove section 2324 and the first groove section 2321, there are all arc transitions.

[0189] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0190] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A housing component for a battery cell, characterized in that, the housing component is provided with a sunk groove, the bottom wall of the sunk groove is provided with a scoring groove, in the circumferential direction of the sunk groove, the scoring groove extends along a closed trajectory, the scoring groove includes a first groove section and a second groove section, the side wall of the sunk groove includes a first side wall located outside the first groove section and a second side wall located outside the second groove section, and the maximum distance between the first groove section and the first side wall is greater than the maximum distance between the second groove section and the second side wall.

2. The housing component according to claim 1, 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.

3. The housing component according to claim 1, characterized in that, the first side wall is a plane, and the second side wall is an arc surface.

4. The housing component according to claim 1, characterized in that, the sunk groove further includes a third side wall and a fourth side wall, the third side wall and the first side wall are oppositely arranged along a first direction, and the fourth side wall and the second side wall are oppositely arranged along a second direction; the first direction intersects with the second direction.

5. The housing component according to claim 4, characterized in that, the first direction is perpendicular to the second direction.

6. The housing component according to claim 4, characterized in that, along the first direction, the distance between the first side wall and the third side wall is W1, and the maximum distance between the first groove section and the first side wall is W2, satisfying 10% * W1 ≤ W2 ≤ 70% * W1.

7. The housing component according to claim 4, characterized in that, the scoring groove further includes a third groove section, the third groove section and the first groove section are arranged at intervals along the first direction, the second groove section connects the first groove section and the third groove section, and the maximum distance between the third groove section and the third side wall is greater than the maximum distance between the second groove section and the second side wall.

8. The housing component according to claim 7, characterized in that, the first groove section and the third groove section are symmetrically arranged with respect to the center point of the sunk groove.

9. The housing component according to claim 7, characterized in that, the scoring groove further includes a fourth groove section, the fourth groove section and the second groove section are arranged at intervals along 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 maximum distance between the first groove section and the first side wall is greater than the maximum distance between the fourth groove section and the fourth side wall.

10. The housing component according to claim 9, characterized in that, the second groove section and the fourth groove section are symmetrically arranged with respect to the center point of the sunk groove.

11. The housing component according to claim 9, characterized in that, the depths of the first groove section, the second groove section and the fourth groove section are greater than the depth of the third groove section.

12. The housing component according to claim 7, 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 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.

13. The housing component according to claim 1, wherein, both the first groove section and the second groove section are arc segments.

14. The housing component according to claim 13, wherein, there is an arc transition between the first groove section and the second groove section.

15. The housing component according to claim 13, wherein, 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° and 40° ≤ α2 ≤ 80°.

16. The housing component according to claim 1, wherein, the length of the second groove section is L1, and the length of the scoring groove is L, satisfying L1 ≥ 1 / 4 * L.

17. The housing component according to claim 1, wherein, the housing component includes a body and a pressure - relief member. A through - hole is provided on the body, and the pressure - relief member covers the through - hole to form the sunken groove.

18. A battery cell, wherein, it includes the housing component according to any one of claims 1 to 17.

19. The battery cell according to claim 18, wherein, the battery cell includes a housing and an end cap. The housing has an opening, and the end cap closes the opening. The housing component is the end cap or the housing.

20. A battery, wherein, it includes the battery cell according to claim 18 or 19.

21. An electrical device, wherein, it includes the battery according to claim 20, and the battery is used to provide electrical energy.

Images