Battery monomer, end cover assembly, battery and power utilization device

Abstract

The utility model provides a battery monomer, an end cover assembly, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly and a pressure relief mechanism, the housing includes a wall portion. The electrode assembly is disposed within the housing. The pressure relief mechanism is arranged on the wall part, the pressure relief mechanism comprises a body, a pressure relief part and a reinforcing part, the body is connected with the wall part, and the pressure relief part is arranged on the body and is configured to release the internal pressure of the battery monomer. Wherein the reinforcing parts are arranged on the two sides of the body in the first direction, and the reinforcing parts and the pressure relief parts are distributed at intervals. The embodiment of the utility model is beneficial to improving the reliability of the battery monomer.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, an end cover assembly, a battery, and an electrical device. Background Art

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve the reliability of batteries is a technical problem that urgently needs to be solved in battery technology. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery cell, an end cover assembly, a battery, and an electrical device, which are beneficial to improving the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, including: a housing including a wall portion; an electrode assembly disposed within the housing; a pressure relief mechanism disposed on the wall portion, the pressure relief mechanism including a body, a pressure relief portion, and a strengthening portion, the body being connected to the wall portion, the pressure relief portion being disposed on the body and configured to release the internal pressure of the battery cell; wherein, strengthening portions are disposed on both sides of the body along a first direction, and the strengthening portions are spaced apart from the pressure relief portion.

[0006] In some embodiments of the first aspect, by disposing strengthening portions spaced from the pressure relief portion on both sides of the body along the first direction, not only can the structural strength of the body be improved, but also the body can deform to reduce or even absorb the pressure transmitted to the pressure relief portion, avoiding the pressure relief portion from releasing its internal pressure when the internal pressure or temperature of the battery cell does not reach the threshold value, reducing the risk of abnormal release of the pressure relief portion, preventing the failure of the pressure relief mechanism, being beneficial to improving the stability of the pressure relief mechanism, and also being beneficial to improving the reliability and service life of the pressure relief mechanism, thereby being beneficial to improving the reliability of the battery cell.

[0007] In some embodiments, the pressure relief portion includes a first recess recessed from one side of the body along the first direction. By setting in this way, it is beneficial to improve the reliability of the pressure relief portion for releasing the internal pressure of the battery cell.

[0008] In some embodiments, the strengthening portion includes a second recess recessed from at least one side of the body along the first direction, and the strength of the body opposite to the second recess is greater than the strength of the body opposite to the first recess in the first direction.

[0009] When the internal pressure or temperature of the battery cell reaches the threshold value, the body opposite to the first recess ruptures due to its relatively small strength, so that the internal pressure of the battery cell is released through the pressure relief part, facilitating the function of the pressure relief part to release the internal pressure; when the battery cell is in normal operation and its internal pressure or temperature does not reach the threshold value, the gas inside the battery cell still exerts a force on the body in the first direction. The body opposite to the second recess can improve the overall structural strength of the pressure relief mechanism due to its relatively large strength, and can cause the body around the second recess to deform to reduce or even absorb the pressure transmitted to the pressure relief part, reducing the risk of abnormal pressure release of the pressure relief part and preventing the failure of the pressure relief mechanism, which is beneficial to improving the reliability of the battery cell.

[0010] In some embodiments, in the first direction, the minimum thickness dimension of the body opposite to the second recess is greater than the minimum thickness dimension of the body opposite to the first recess. By setting in this way, it can ensure the effectiveness of the pressure relief part in releasing the internal pressure of the battery cell, and can also ensure the effectiveness of the strengthening part in improving the overall strength of the pressure relief mechanism and reducing or even absorbing the pressure transmitted to the pressure relief part.

[0011] In some embodiments, along the first direction, the orthographic projections of the strengthening parts arranged on both sides of the body on the body are staggered with each other. Such a design facilitates the processing and manufacturing of the strengthening parts, reduces the stress concentration on the body, and is beneficial to increasing the area of the strengthening parts distributed on the body to achieve a better effect.

[0012] In some embodiments, along the first direction, the orthographic projection of the pressure relief part on the body and the orthographic projection of the strengthening part on the body are staggered with each other. Such a design facilitates the processing and manufacturing of the pressure relief part and the strengthening part, reduces the stress concentration on the body, and can also prevent interference between the pressure relief part and the strengthening part, preventing the failure of the pressure relief mechanism.

[0013] In some embodiments, the minimum distance between adjacent pressure relief parts and strengthening parts is greater than or equal to 2 mm. By setting in this way, it is beneficial to reduce the manufacturing difficulty, and can also prevent interference between the pressure relief part and the strengthening part, resulting in preventing the failure of the pressure relief mechanism.

[0014] In some embodiments, the extension trajectories of the strengthening part and the pressure relief part have the same shape. Such a design is beneficial to improving the protection effect of the strengthening part on the pressure relief part. That is to say, setting the strengthening part can disperse the pressure transmitted to the pressure relief part. Since their extension trajectories are the same, the pressure transmitted to each position of the pressure relief part can be dispersed by the strengthening part, preventing the possibility of a certain position of the pressure relief part being under pressure, which is beneficial to improving the reliability.

[0015] In some embodiments, the extension trajectories of the reinforcing portion and the pressure relief portion are each in an annular trajectory. Such a design is conducive to improving the reliability of the pressure relief portion in releasing the internal pressure of the battery cell, and is conducive to ensuring that the reinforcing portion can improve the overall strength of the pressure relief mechanism and can reduce or even absorb the reliability of the pressure transmitted to the pressure relief portion.

[0016] In some embodiments, the body is partitioned by the pressure relief portion to form a first region and a second region. The second region is disposed around the first region, and at least one reinforcing portion is disposed in the first region. By setting in this way, it is conducive to improving the reliability of the reinforcing portion in dispersing and conducting the pressure transmitted to the pressure relief portion.

[0017] In some embodiments, at least one reinforcing portion is disposed in the second region. At least one reinforcing portion can be respectively disposed in the first region and the second region, which can not only effectively improve the strength of the pressure relief mechanism, but also be conducive to improving the reliability of the reinforcing portion in dispersing and conducting the pressure transmitted to the pressure relief portion.

[0018] In some embodiments, the number of the reinforcing portions disposed in the first region is greater than the number of the reinforcing portions disposed in the second region. Such a design layout is reasonable, which can not only ensure that the pressure relief portion on the body has sufficient setting area, but also ensure that enough reinforcing portions are provided to improve the reliability of the pressure relief mechanism, thereby improving the reliability of the battery cell.

[0019] In some embodiments, the housing includes an end cap and a housing body. The housing body has an opening, the end cap is connected to the housing body and closes the opening, and a wall portion is formed on either the end cap or the housing body. By setting in this way, it is conducive to improving the diversity and use flexibility of the battery cell.

[0020] In a second aspect, the present application provides an end cap assembly for a battery cell, including: an end cap; a pressure relief mechanism disposed on the end cap, the pressure relief mechanism including a body, a pressure relief portion, and a reinforcing portion. The body is connected to the end cap, and the pressure relief portion is disposed on the body and is configured to release the internal pressure of the battery cell; wherein, reinforcing portions are disposed on both sides of the body along a first direction, and the reinforcing portions are spaced apart from the pressure relief portion.

[0021] In some embodiments of the second aspect, by disposing reinforcing portions spaced from the pressure relief portion on both sides of the body along the first direction, it can not only improve the structural strength of the region where the body is located, but also deform to reduce or even absorb the pressure transmitted to the pressure relief portion, avoid the pressure relief portion from releasing its internal pressure when the internal pressure or temperature of the battery cell does not reach the threshold, reduce the risk of abnormal release of the pressure relief portion, prevent the failure of the pressure relief mechanism, be conducive to improving the stability of the pressure relief mechanism, and also be conducive to improving the reliability and service life of the pressure relief mechanism, thereby being conducive to improving the reliability of the end cap assembly.

[0022] In a third aspect, the present application provides a battery including the battery cell provided in any embodiment of the first aspect.

[0023] In a fourth aspect, the present application provides an electrical device, including the battery provided in any of the embodiments of the third aspect, and the battery is used to provide electrical energy.

[0024] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0025] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0026] Figure 1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0027] Figure 2 is an exploded structural diagram of a battery provided in some embodiments of the present application;

[0028] Figure 3 is a schematic structural diagram of a battery module provided in some embodiments of the present application;

[0029] Figure 4 is a three-dimensional structural diagram of a battery cell provided in some embodiments of the present application;

[0030] Figure 5 is an exploded structural diagram of a battery cell provided in some embodiments of the present application;

[0031] Figure 6 is a schematic structural diagram of a pressure relief mechanism in a battery cell provided in some embodiments of the present application;

[0032] Figure 7 is a schematic structural diagram of a pressure relief mechanism in a battery cell provided in some other embodiments of the present application;

[0033] Figure 8 is Figure 6 a structural diagram from another perspective;

[0034] Figure 9 is Figure 8 a sectional structural diagram along A-A;

[0035] Figure 10 is Figure 9 an enlarged view of point P in

[0036] Figure 11 A partial cross-sectional structural diagram of a pressure relief mechanism in a battery cell provided by some embodiments of the present application.

[0037] The reference numerals in the specific embodiments are as follows:

[0038] 1 - Vehicle; 1000 - Battery; 2000 - Controller; 3000 - Motor; 100a - Battery module; 100 - Battery cell; 200 - Box body; 210 - First box body part; 220 - Second box body part;

[0039] 10 - Outer shell; 11 - Wall part; 101 - End cover; 102 - Housing;

[0040] 20 - Electrode assembly;

[0041] 30 - Pressure relief mechanism; 31 - Body; T1 - First area; T2 - Second area; 32 - Pressure relief part; 321 - First recess; 33 - Reinforcement part; 331 - Second recess;

[0042] 40 - Electrode terminal; 50 - First insulating part; 60 - Second insulating part;

[0043] X - First direction. Specific embodiments

[0044] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and should not be used to limit the protection scope of the present application.

[0045] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present application.

[0047] In addition, technical terms such as "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically and clearly defined.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, technical terms such as "install", "connect", "couple", "fix", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0049] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0050] Currently, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of batteries, the market demand for them is also continuously increasing.

[0051] The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as battery life, energy density, discharge capacity, charge and discharge rate, etc. In addition, the reliability of the battery also needs to be considered.

[0052] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc.

[0053] The battery cell can be a secondary battery cell, and a secondary battery cell refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0054] In related technologies, for a battery to ensure the safety of a battery cell, a pressure relief mechanism is usually provided on the outer shell of the battery cell. When the internal pressure or temperature of the battery cell reaches a threshold value, the internal substances (liquid, gas) of the battery cell are discharged through the pressure relief mechanism to release the internal pressure of the battery cell, preventing problems such as combustion and explosion of the battery cell, making the reliability of the battery cell relatively high, and avoiding the occurrence of explosion accidents.

[0055] During the normal operation of the battery cell, gas is generated inside the battery cell. The gas exerts a certain pressure on the pressure relief mechanism of the battery cell, causing the battery cell to expand to a certain extent. Under the action of the gas pressure, the area where the pressure relief mechanism is located is prone to certain deformation, which is likely to cause the abnormal opening of the pressure relief mechanism, that is, it is likely to cause the pressure relief mechanism to rupture when the internal pressure of the battery cell has not reached the threshold value, affecting the normal use of the battery cell and triggering safety problems.

[0056] Based on the above technical problems, an embodiment of the present application provides a battery cell, which includes an outer shell, an electrode assembly, and a pressure relief mechanism. The outer shell includes a wall portion. The electrode assembly is disposed inside the outer shell. The pressure relief mechanism is disposed on the wall portion. The pressure relief mechanism includes a body, a pressure relief portion, and a reinforcing portion. The body is connected to the wall portion. The pressure relief portion is disposed on the body and is configured to release the internal pressure of the battery cell. Among them, reinforcing portions are disposed on both sides of the body along a first direction, and the reinforcing portions are spaced apart from the pressure relief portion.

[0057] The reinforcing portion can improve the structural strength of the body, that is, it is beneficial to improve the strength of the pressure relief mechanism. Moreover, the reinforcing portion can also absorb deformation to reduce the pressure transmitted to the pressure relief portion, avoid the pressure relief portion from releasing its internal pressure when the internal pressure or temperature of the battery cell has not reached the threshold value, reduce the risk of abnormal release of the pressure relief portion, be beneficial to improving the stability of the pressure relief mechanism, and also be beneficial to improving the reliability and service life of the pressure relief mechanism, thereby being beneficial to improving the reliability of the battery cell.

[0058] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries. For example, mobile phones, portable devices, laptop computers, battery cars, electric toys, electric tools, electric vehicles, ships, and spacecrafts, etc. For example, spacecrafts include airplanes, rockets, space shuttles, and spaceships, etc.

[0059] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, and can also be applicable to all devices using batteries. However, for the sake of concise description, the following embodiments are all described by taking an electric vehicle as an example.

[0060] For example, as Figure 1 shown, Figure 1A schematic structural diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 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 motor 3000, a controller 2000, and a battery 1000 can be arranged inside the vehicle 1. The controller 2000 is used to control the battery 1000 to supply power to the motor 3000. For example, the battery 1000 can be arranged at the bottom, the front end, or the rear end of the vehicle 1. The battery 1000 can be used for power supply of the vehicle 1. For example, the battery 1000 can be used as the operating power source of the vehicle 1 for the circuit system of the vehicle 1, such as for the power consumption requirements during the start, navigation, and operation of the vehicle 1. In another embodiment of the present application, the battery 1000 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1 to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0061] As Figure 2 and Figure 3 shown, in order to meet different power usage requirements, the battery 1000 can include a plurality of battery cells 100. Among them, the plurality of battery cells 100 can be connected in series, in parallel, or in a series-parallel combination. The series-parallel combination means a combination of series and parallel connections. The battery 1000 can also be referred to as a battery pack. Optionally, the plurality of battery cells 100 can first be connected in series, in parallel, or in a series-parallel combination to form a battery module 100a, and then the plurality of battery modules 100a are connected in series, in parallel, or in a series-parallel combination to form the battery 1000. That is to say, the plurality of battery cells 100 can directly form the battery 1000, or can first form the battery module 100a, and then the battery modules form the battery 1000.

[0062] In the present application, the battery cell 100 can include a lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., and the embodiments of the present application are not limited thereto. The battery cell 100 can be in a cylindrical shape, a flat shape, a cuboid shape, or other shapes, and the embodiments of the present application are not limited thereto. Generally, the battery cell 100 is divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application are not limited thereto.

[0063] As Figure 2 shown, a battery 1000 according to an embodiment of the present application further includes a box body 200. The plurality of battery cells 100 are accommodated in the box body 200, and the box body 200 can protect the battery cells 100.

[0064] The housing 200 can be a simple three-dimensional structure such as a separate cuboid, cylinder or sphere, or a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders or spheres. The embodiments of the present application do not limit this. The material of the housing 200 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber and epoxy resin. The embodiments of the present application also do not limit this.

[0065] The housing 200 is used to accommodate the battery cell 100, and the housing 200 can be of various structures. In some embodiments, the housing 200 may include a first housing part 210 and a second housing part 220. The first housing part 210 and the second housing part 220 cover each other, and the first housing part 210 and the second housing part 220 jointly define a receiving cavity 200a for accommodating the battery cell 100. Both the first housing part 210 and the second housing part 220 can be hollow structures with one side open. The open side of the first housing part 210 covers the open side of the second housing part 220 to form the housing 200 with the receiving cavity 200a. Of course, the first housing part 210 and the second housing part 220 can be of various shapes, such as cylinders, cuboids, etc. The first housing part 210 can also be a plate-like structure, and the second housing part 220 can be a hollow structure with one side open.

[0066] To improve the sealing performance after the connection between the first housing part 210 and the second housing part 220, a sealing member such as sealant, sealing ring, etc. can also be provided between the first housing part 210 and the second housing part 220.

[0067] Please refer to Figures 4 to 11 , according to the embodiments of the present application, a battery cell 100 is provided, which includes a housing 10, an electrode assembly 20, and a pressure relief mechanism 30. The housing 10 includes a wall portion 11. The electrode assembly 20 is disposed inside the housing 10. The pressure relief mechanism 30 is disposed on the wall portion 11. The pressure relief mechanism 30 includes a body 31, a pressure relief portion 32, and a strengthening portion 33. The body 31 is connected to the wall portion 11, and the pressure relief portion 32 is disposed on the body 31 and is configured to release the internal pressure of the battery cell 100. Among them, strengthening portions 33 are disposed on both sides of the body 31 along the first direction X, and the strengthening portions 33 and the pressure relief portion 32 are spaced apart.

[0068] The housing 10 is a component for forming the internal environment of the battery cell 100. The internal environment formed by it can be used to accommodate the electrode assembly 20, and can also be used to accommodate the electrolyte and other components. Optionally, the housing 10 can be made of, but not limited to, metal or non-metal materials. For example, the metal material can be copper, aluminum, or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene, or polyvinyl chloride, etc.

[0069] The electrode assembly 20 is a component in the battery cell 100 where electrochemical reactions occur, and the housing 10 can contain one or more electrode assemblies 20. The electrode assembly 20 is mainly formed by winding or laminating a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 20, and the parts of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals 40 to form a current loop.

[0070] The pressure relief mechanism 30 is used to break when the internal pressure or temperature of the battery cell 100 reaches a threshold value to release the internal pressure. Optionally, the pressure relief mechanism 30 includes but is not limited to structures such as explosion-proof valves, gas valves, pressure relief valves, and safety valves.

[0071] Specifically, please refer to Figure 5 and Figure 6 , the pressure relief mechanism 30 includes a main body 31 and a pressure relief part 32. The main body 31 is detachably connected to the wall part 11, and can also be an integrally formed structure with the wall part 11. The main body 31 can be directly connected to the wall part 11, or can be connected to the wall part 11 through other components. Exemplarily, the connection method between the main body 31 and the wall part 11 can be but is not limited to bolt connection, riveting, bonding, or snap connection, etc.

[0072] The pressure relief part 32 is configured to release the internal pressure of the battery cell 100. For example, when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the pressure relief part 32 can form a pressure relief port on the main body 31, so that the inside of the housing 10 communicates with the outside, thereby discharging the internal substances (liquid, gas) of the battery cell 100, realizing the release of pressure, and reducing the risk of combustion and explosion of the battery cell 100.

[0073] The pressure relief part 32 can be set as a structure connected to the main body 31, and the strength of the pressure relief part 32 is less than the strength of the main body 31. When the internal pressure or temperature of the battery cell 100 reaches a threshold value, the pressure relief part 32 actuates and ruptures to release the internal pressure of the battery; or, please refer to Figures 8 to 10 , the pressure relief part 32 can also include a first recess 321 recessed from one side of the main body 31 along the first direction X. The main body 31 opposite to the first recess 321 along the first direction X, that is, the thickness of the main body 31 connected to the first recess 321 along the first direction X is less than the thickness of the main body 31 at other positions. When the internal pressure or temperature of the battery cell 100 reaches a threshold value, the main body 31 opposite to the first recess 321 along the first direction X actuates and ruptures, and the internal pressure of the battery cell 100 is released to the outside by the pressure relief part 32, that is, the first recess 321.

[0074] Among them, the first direction X can be understood as the direction from the main body 31 towards the electrode assembly 20. For example, when the battery cell 100 has a rectangular structure, the first direction X can be the length direction, width direction, or height direction of the battery cell 100, and can be specifically set according to the position of the wall portion 11 where the pressure relief mechanism 30 is provided.

[0075] Further, please continue to refer to Figure 5 and Figure 6 The pressure relief mechanism 30 further includes a reinforcing portion 33. The reinforcing portions 33 are provided on both sides of the main body 31 along the first direction X, that is, the number of the reinforcing portions 33 is at least two.

[0076] In some embodiments, as Figure 11 shown, the reinforcing portion 33 may include a structure connected to both sides of the main body 31 along the first direction X. The reinforcing portion 33 may be integrally provided on the main body 31, or may be connected to the main body 31 by connection methods such as bolt connection, riveting, bonding, or snap connection. Or, the reinforcing portion 33 is formed by stretching the main body 31 along the first direction X, that is, the reinforcing portion 33 protrudes from the main body 31 along the first direction X to improve the structural strength of the main body 31 along the first direction X, thereby improving the overall structural strength of the pressure relief mechanism 30; and, during the normal operation of the battery cell 100, gas is generated inside the battery cell 100, and the gas will exert a certain pressure on the pressure relief mechanism 30, causing the battery cell 100 to expand to a certain extent. There is a height difference between the protruding reinforcing portion 33 and the main body 31, that is, there is a deformable space. The reinforcing portion 33 and the main body 31 at this position can deform to reduce or even absorb the pressure transmitted to the pressure relief portion 32, avoiding the pressure relief portion 32 from discharging the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 does not reach the threshold value, reducing the risk of abnormal discharge of the pressure relief portion 32, and preventing the pressure relief mechanism 30 from failing.

[0077] In some embodiments, the reinforcing portion 33 may further include a second concave portion 331 formed by recessing at least one side of the main body 31 along the first direction X, and the main body 31 opposite to the second concave portion 331 along the first direction X, that is, the strength of the main body 31 connected to the second concave portion 331 along the first direction X is greater than the strength of the main body 31 opposite to the first concave portion 321 along the first direction X, or the minimum thickness dimension of the main body 31 opposite to the second concave portion 331 along the first direction X is smaller than the minimum thickness dimension of the main body 31 opposite to the first concave portion 321 along the first direction X, so as to ensure that the reinforcing portion 33 can improve the overall structural strength of the pressure relief mechanism 30, and at the same time, can deform to reduce or even absorb the pressure transmitted to the pressure relief portion 32.

[0078] In a pressure relief mechanism 30, the strengthening portion 33 may all be configured as a structure protruding from the main body 31, may all be configured as a second recess 331, or a part may be configured as a structure protruding from the main body 31 and another part may be configured as the second recess 331.

[0079] For the battery cell 100 provided by an embodiment of the present application, by arranging strengthening portions 33 spaced apart from the pressure relief portion 32 on both sides of the main body 31 along the first direction X, the structural strength of the main body 31 can be improved, and deformation can occur to reduce or even absorb the pressure transmitted to the pressure relief portion 32, preventing the pressure relief portion 32 from discharging the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 does not reach the threshold value, reducing the risk of abnormal discharge of the pressure relief portion 32, preventing the failure of the pressure relief mechanism 30, facilitating the improvement of the stability of the pressure relief mechanism 30, and also facilitating the improvement of the reliability and service life of the pressure relief mechanism 30, thereby facilitating the improvement of the reliability of the battery cell 100.

[0080] Optionally, the number of the pressure relief portions 32 is set to one. Of course, it may also be set to two or more. In the first direction X, the pressure relief portion 32 may be arranged on one side of the main body 31 facing the electrode assembly 20, and the pressure relief portion 32 may also be arranged on the side of the main body 31 facing away from the electrode assembly 20. Exemplarily, as Figure 6 and Figure 7 shown, Figure 6 may represent one side of the pressure relief mechanism 30 facing the electrode assembly 20 along the first direction X, Figure 7 may represent one side of the pressure relief mechanism 30 facing away from the electrode assembly 20 along the first direction X. The pressure relief portion 32 is arranged on the side of the main body 31 facing the electrode assembly 20. By setting in this way, the internal pressure of the battery cell 100 can be discharged more quickly through the pressure relief portion 32.

[0081] Optionally, the number of the strengthening portions 33 may be set to two. Of course, it may also be set to multiple. Specifically, it can be designed according to the structural dimensions of the main body 31, such as thickness, area, etc. Specifically, it only needs to ensure that the pressure relief portion 32 and the strengthening portions 33 are distributed at intervals.

[0082] Please refer to Figures 6 to 10 , according to some embodiments of the present application, the pressure relief portion 32 includes a first recess 321 recessed from one side of the main body 31 along the first direction X.

[0083] The first recess 321 can be understood as a notch, that is, the pressure relief portion 32 includes a notch arranged on one side of the main body 31 along the first direction X.

[0084] Optionally, the first recess 321 may be formed on the body 31 by stamping or cutting to remove material. The structural strength of the body 31 corresponding to the first recess 321 along the first direction X is less than that of other parts of the body 31. Thus, when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the internal pressure of the battery cell 100 can break through the body 31 opposite to the first recess 321 to form a pressure relief port at the position of the first recess 321 and release the internal pressure.

[0085] Exemplarily, the first recess 321 may be formed on the body 31 by cutting to remove material, which is convenient for making the structural strength of the body 31 corresponding to the first recess 321 less than that of other parts of the body 31.

[0086] When the internal pressure or temperature of the battery cell 100 reaches a threshold value, the internal pressure of the battery cell 100 breaks through the body 31 opposite to the first recess 321 and is discharged to the outside through the first recess 321, thereby reducing the risk of thermal runaway of the battery cell 100 and improving the reliability of the battery cell 100.

[0087] The battery cell 100 provided by an embodiment of the present application is arranged in this way, which is beneficial to improving the reliability of the pressure relief part 32 for releasing the internal pressure of the battery cell 100.

[0088] Please continue to refer to Figures 6 to 10 , in some embodiments, the reinforcing part 33 includes a second recess 331 formed by at least one side of the body 31 being recessed along the first direction X. In the first direction X, the strength of the body 31 opposite to the second recess 331 is greater than the strength of the body 31 opposite to the first recess 321.

[0089] Optionally, the reinforcing part 33 may be formed by extrusion molding of the body 31 along the first direction X, that is, the first recess 321 may be formed on the body 31 by stamping, so that the strength of the body 31 opposite to the second recess 331 along the first direction X is greater than the strength of the body 31 opposite to the first recess 321 along the first direction X, and is also greater than the strength of other positions of the body 31, so as to improve the overall structural strength of the body 31, that is, the pressure relief mechanism 30.

[0090] For a battery cell 100 provided by an embodiment of the present application, when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the body 31 opposite to the first recess 321 ruptures due to relatively low strength, so that the internal pressure of the battery cell 100 is released from the first recess 321, facilitating the function of the pressure relief portion 32 to release the internal pressure; when the battery cell 100 is in normal operation and its internal pressure or temperature does not reach the threshold value, there is still a force exerted on the body 31 along the first direction X by the gas inside the battery cell 100. The body 31 opposite to the second recess 331 has relatively high strength, which can improve the overall structural strength of the pressure relief mechanism 30, and can cause the body 31 around the second recess 331 to deform to reduce or even absorb the pressure transmitted to the pressure relief portion 32, reducing the risk of abnormal pressure release of the pressure relief portion 32, preventing the failure of the pressure relief mechanism 30, and being conducive to improving the reliability of the battery cell 100.

[0091] Specifically, when a gas exerts a force on the body 31 along the first direction X, the second recess 331 will deform. The deformation is specifically manifested as a change in the area of the second recess 331, and the body 31 around the second recess 331 will also deform accordingly. The deformation is specifically manifested as deformation along the first direction X and along the direction intersecting with the first direction X, greatly reducing the force transmitted to the pressure relief portion 32 and avoiding abnormal pressure release of the pressure relief portion 32.

[0092] Optionally, the reinforcing portion 33 may include a second recess 331 formed by recessing one side of the body 31 along the first direction X, and further include a protruding structure protruding from the other side of the body 31 along the first direction X. Of course, the reinforcing portion 33 may also include second recesses 331 formed by recessing both sides of the body 31 along the first direction X.

[0093] Optionally, the shapes and extension trajectories of each second recess 331 may be the same or may be set differently. Optionally, the opening areas of each second recess 331 may be the same or may be set differently.

[0094] As Figure 10 shown, according to some embodiments of the present application, in the first direction X, the minimum thickness dimension of the body 31 opposite to the second recess 331 is greater than the minimum thickness dimension of the body 31 opposite to the first recess 321.

[0095] The minimum thickness dimension refers to the minimum thickness of the body 31 opposite to the second recess 331 along the first direction X in the first direction X.

[0096] The battery cell 100 provided by an embodiment of the present application is configured in this way, which can ensure the effectiveness of the pressure relief part 32 in releasing the internal pressure of the battery cell 100, and can also ensure that the strengthening part 33 can improve the overall strength of the pressure relief mechanism 30 and can reduce or even absorb the effectiveness of the pressure transmitted to the pressure relief part 32.

[0097] Optionally, the number of the second recesses 331 can be set to two or more. The minimum thickness dimensions of the body 31 opposite to each of the second recesses 331 along the first direction X can be the same or different. That is to say, the depths of the depressions of each of the second recesses 331 along the first direction X can be the same or different.

[0098] For example, as Figure 10 shown, Figure 9 it shows a first recess 321 and five second recesses 331. In the direction pointing from left to right, the minimum thickness dimensions of the body 31 opposite to the five second recesses 331 are d1, d2, d3, d4, and d5 in sequence, and the minimum thickness dimension of the body 31 opposite to the first recess 321 is D. Among them, the values of d1, d2, d3, d4, and d5 can be equal or can be not equal respectively, and the values of d1, d2, d3, d4, and d5 are all greater than the value of D.

[0099] Optionally, the strengthening part 33 can be arranged at the central position of the body 31 or at the peripheral position of the body 31.

[0100] In some embodiments, along the first direction X, the orthographic projections of the strengthening parts 33 arranged on both sides of the body 31 on the body 31 are arranged in a staggered manner.

[0101] It can be understood that along the first direction X, the orthographic projections of the strengthening parts 33 arranged on both sides of the body 31 on the body 31 do not overlap each other.

[0102] The battery cell 100 provided by an embodiment of the present application is configured in this way, which is convenient for the processing and manufacturing of the strengthening part 33, reduces the stress concentration on the body 31, and is beneficial to increasing the area of the distribution of the strengthening part 33 on the body 31 to achieve a better effect.

[0103] Optionally, along the first direction X, the orthographic projection of an adjacent two strengthening parts 33 arranged on one side of the body 31 on the body 31 surrounds the orthographic projection of a strengthening part 33 arranged on the other side of the body 31 on the body 31.

[0104] Optionally, in the direction perpendicular to the first direction X, the spacing between adjacent two strengthening parts 33 can be the same or can be set to be different.

[0105] In some embodiments, along the first direction X, the orthographic projection of the pressure relief portion 32 on the body 31 and the orthographic projection of the strengthening portion 33 on the body 31 are arranged in an interleaved manner.

[0106] It can be understood that along the first direction X, the orthographic projection of the pressure relief portion 32 on the body 31 and the orthographic projection of the strengthening portion 33 on the body 31 do not overlap with each other.

[0107] For the battery cell 100 provided in an embodiment of the present application, by setting in this way, it is convenient for the processing and manufacturing of the pressure relief portion 32 and the strengthening portion 33, reduces the stress concentration on the body 31, and can also prevent interference between the pressure relief portion 32 and the strengthening portion 33, preventing the pressure relief mechanism 30 from failing.

[0108] In some embodiments, the minimum distance between the adjacent pressure relief portion 32 and the strengthening portion 33 is greater than or equal to 2 mm.

[0109] The adjacent pressure relief portion 32 and the strengthening portion 33 can be understood as the pressure relief portion 32 and the strengthening portion 33 with the smallest distance along the direction perpendicular to the first direction X, that is, the closest pressure relief portion 32 and the strengthening portion 33.

[0110] By setting in this way, it is beneficial to reduce the manufacturing difficulty, and can also prevent interference between the pressure relief portion 32 and the strengthening portion 33, resulting in preventing the pressure relief mechanism 30 from failing.

[0111] It can be understood that if the minimum distance between the adjacent pressure relief portion 32 and the strengthening portion 33 is set too small, that is, less than 2 mm, then the pressure relief portion 32 and the strengthening portion 33 are set too close, increasing the manufacturing difficulty and reducing the product yield. And if they are set too close, there is not enough space for the strengthening portion 33 to deform after being stressed, and there is still a possibility that the pressure will be transmitted to the pressure relief portion 32. Therefore, through the above settings, it can not only reduce the manufacturing difficulty, but also effectively avoid the failure of the pressure relief mechanism 30, thereby being beneficial to improving the reliability of the battery cell 100.

[0112] Optionally, the minimum distance between the adjacent pressure relief portion 32 and the strengthening portion 33 can be 2 mm, and can also be 3 mm, 4 mm, 5 mm, etc.

[0113] In some embodiments, the extension trajectory of the strengthening portion 33 has the same shape as the extension trajectory of the pressure relief portion 32.

[0114] The extension trajectory of the pressure relief portion 32 can be various shapes. For example, the pressure relief portion 32 is a runway-shaped groove extending along a runway-shaped trajectory, and correspondingly, the strengthening portion 33 is a runway-shaped groove or a runway-shaped protrusion extending along a runway-shaped trajectory; the pressure relief portion 32 is a rectangular groove extending along a rectangular trajectory, and correspondingly, the strengthening portion 33 is a rectangular groove or a rectangular protrusion extending along a rectangular trajectory.

[0115] The battery cell 100 provided by an embodiment of the present application is arranged in this way, which is beneficial to improving the protection effect of the strengthening part 33 on the pressure relief part 32. That is to say, setting the strengthening part 33 can disperse the pressure conducted to the pressure relief part 32. Since their extension trajectories are the same, the pressure conducted to each position of the pressure relief part 32 can be dispersed by the strengthening part 33, so as to prevent the possibility of a certain position of the pressure relief part 32 being subjected to pressure, which is beneficial to improving the reliability.

[0116] In some embodiments, the extension trajectories of the strengthening part 33 and the pressure relief part 32 are each in an annular trajectory.

[0117] The pressure relief part 32 and the strengthening part 33 can be a closed structure extending along a closed annular trajectory, and the pressure relief part 32 and the strengthening part 33 can also be a discontinuous structure or a non-closed structure along a non-closed annular trajectory. The extension trajectories of the strengthening part 33 and the pressure relief part 32 have the same shape and are both annular structures.

[0118] The battery cell 100 provided by an embodiment of the present application is arranged in this way, which is beneficial to improving the reliability of the pressure relief part 32 to release the internal pressure of the battery cell 100, and is also beneficial to ensuring that the strengthening part 33 can improve the overall strength of the pressure relief mechanism 30 and can reduce or even absorb the reliability of the pressure transmitted to the pressure relief part 32.

[0119] As Figure 10 shown, in some embodiments, the body 31 is separated by the pressure relief part 32 to form a first area T1 and a second area T2. The second area T2 is arranged around the first area T1, and at least one strengthening part 33 is arranged in the first area T1.

[0120] It can be understood that the extension trajectory of the pressure relief part 32 is in an annular trajectory. The side of the pressure relief part 32 close to the central position of the body 31 is the first area T1, and the side of the pressure relief part 32 close to the peripheral position of the body 31 is the second area T2. The second area T2 is arranged around the first area T1 and the pressure relief part 32, and the pressure relief part 32 is arranged around the first area T1.

[0121] The battery cell 100 provided by an embodiment of the present application is arranged in this way, which is beneficial to improving the reliability of the strengthening part 33 to disperse the pressure conducted to the pressure relief part 32. And, arranged in this way, the layout is reasonable and it is convenient for the design of the strengthening part 33.

[0122] Optionally, the first area T1 can be provided with one strengthening part 33, or can also be provided with two or even more strengthening parts 33.

[0123] In some embodiments, at least one strengthening part 33 is arranged in the second area T2.

[0124] For a battery cell 100 provided by an embodiment of the present application, at least one reinforcing part 33 can be respectively arranged in the first area T1 and the second area T2, which can not only effectively improve the strength of the pressure relief mechanism 30, but also be conducive to improving the reliability of the pressure dispersed and conducted by the reinforcing part 33 to the pressure relief part 32.

[0125] Optionally, one reinforcing part 33 can be arranged in the second area T2, or it can also be arranged as two or more reinforcing parts 33.

[0126] In some embodiments, the number of the reinforcing parts 33 arranged in the first area T1 is greater than the number of the reinforcing parts 33 arranged in the second area T2.

[0127] For the battery cell 100 provided by an embodiment of the present application, through this setting method, the layout is reasonable. It can not only ensure that the pressure relief part 32 on the body 31 has sufficient setting area, but also ensure that enough reinforcing parts 33 are set to improve the reliability of the pressure relief mechanism 30, thereby improving the reliability of the battery cell 100.

[0128] Exemplarily, two reinforcing parts 33 can be arranged in the second area T2, and these two reinforcing parts 33 are respectively arranged on both sides of the body 31 along the first direction X. A plurality of reinforcing parts 33 can be arranged in the first area T1.

[0129] As Figure 5 shown, in some embodiments, the battery cell 100 further includes a first insulating part 50, and the first insulating part 50 is arranged on one side of the outer shell 10 facing the electrode assembly 20 along the first direction X. The first insulating part 50 is a component with insulating properties. The first insulating part 50 can insulate and isolate the outer shell 10 from the electrical connection components inside the battery cell 100. For example, the first insulating part 50 can insulate and isolate the outer shell 10 and the electrode assembly 20 to reduce the risk of short circuit. The first insulating part 50 can be made of plastic, rubber, etc.

[0130] In some embodiments, the battery cell 100 further includes a second insulating part 60, and the second insulating part 60 is arranged on one side of the outer shell 10 facing away from the electrode assembly 20 along the first direction X. The second insulating part 60 is a component with insulating properties. The second insulating part 60 can insulate and isolate the outer shell 10 from the electrical connection components outside the battery cell 100. For example, the first insulating part 50 can insulate and isolate the wall outer shell 10 and the bus bar to reduce the risk of short circuit. The second insulating part 60 can be made of plastic, rubber, etc.

[0131] Please continue to refer to Figure 5 , according to some embodiments of the present application, the outer shell 10 includes an end cover 101 and a housing 102. The housing 102 has an opening, the end cover 101 is connected to the housing 102 and closes the opening, and a wall part 11 is formed on either the end cover 101 or the housing 102.

[0132] The end cap 101 and the housing 102 can be independent components. An opening can be provided on the housing 102, and the end cap 101 is closed at the opening to form the internal environment of the battery cell 100.

[0133] The housing 102 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 102 can be determined according to the specific shape and size of the electrode assembly 20. The material of the housing 102 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0134] In some embodiments, the housing 102 can be a rectangular housing. The housing 102 includes a bottom wall and four side walls surrounding the edge of the bottom wall. One end of the four side walls away from the bottom wall forms an opening, and the end cap 101 is connected to the four side walls to close the opening.

[0135] In some embodiments, the housing 102 can be a circular housing. The housing 102 includes a bottom wall and a peripheral wall surrounding the edge of the bottom wall. One end of the peripheral wall away from the bottom wall forms an opening, and the end cap 101 is connected to the peripheral wall to close the opening.

[0136] The end cap 101 refers to a component that closes the opening of the housing 102 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cap 101 can be adapted to the shape of the housing 102 to cooperate with the housing 102. The material of the end cap 101 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special restrictions on this.

[0137] Optionally, the end cap 101 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 101 is not easily deformed when being squeezed and collided, so that the battery cell 100 can have higher structural strength and the reliability can also be improved. In some examples, the housing 102 is a hollow structure with an opening on one side, and the end cap 101 is one and closes the opening of the housing 102. In other examples, the housing 102 is a hollow structure with openings on both sides, and the end cap 101 is two, and the two end caps 101 respectively close the two openings of the housing 102.

[0138] The wall portion 11 is formed on either the end cap 101 or the housing 102. It can be understood that the end cap 101 has a wall portion 11 for setting the pressure relief mechanism 30, that is, the pressure relief mechanism 30 is provided on the end cap 101; or, the housing 102 has a wall portion 11 for setting the pressure relief mechanism 30, that is, the pressure relief mechanism 30 is provided on the housing 102; or, the end cap 101 and the housing 102 have a wall portion 11 for setting the pressure relief mechanism 30, and the pressure relief mechanism 30 is provided on both the end cap 101 and the housing 102.

[0139] Exemplarily, the wall portion 11 is formed on the end cap 101, and the pressure relief mechanism 30 is disposed on the end cap 101.

[0140] In some embodiments, the end cap 101 may be the top cover of the housing 10. That is, when the battery cell 100 is in use, the end cap 101 is the part with the highest position of the housing 102. Among them, the end cap 101 can be manufactured independently. Therefore, the pressure relief mechanism 30 can be quickly integrated on the end cap 101, which is beneficial to improving the manufacturing efficiency of the battery cell 100 and the manufacturing efficiency of the battery 1000.

[0141] In some alternative embodiments, the end cap 101 and the housing 102 can also be integrated. Specifically, the end cap 101 and the housing 102 can form a common connection surface before other components are put into the housing. When the inside of the housing 102 needs to be encapsulated, the end cap 101 is then combined with the housing 102.

[0142] The battery cell 100 provided by an embodiment of the present application is arranged in this way, which is beneficial to improving the diversity and usage flexibility of the battery cell 100.

[0143] As Figure 5 shown, according to some embodiments of the present application, the present application also provides an end cap assembly for the battery cell 100, including an end cap 101 and a pressure relief mechanism 30. The pressure relief mechanism 30 is disposed on the end cap 101. The pressure relief mechanism 30 includes a body 31, a pressure relief portion 32 and a reinforcing portion 33. The body 31 is connected to the end cap 101. The pressure relief portion 32 is disposed on the body 31 and is configured to release the internal pressure of the battery cell 100. Among them, reinforcing portions 33 are disposed on both sides of the body 31 along the first direction X, and the reinforcing portions 33 are spaced apart from the pressure relief portion 32.

[0144] In some embodiments of the second aspect, by providing reinforcing portions 33 spaced from the pressure relief portion 32 on both sides of the body 31 along the first direction X, it can not only improve the structural strength of the area where the body 31 is located, but also deform to reduce or even absorb the pressure transmitted to the pressure relief portion 32, avoid the pressure relief portion 32 from releasing its internal pressure when the internal pressure or temperature of the battery cell 100 does not reach the threshold, reduce the risk of abnormal release of the pressure relief portion 32, prevent the pressure relief mechanism 30 from failing, be beneficial to improving the stability of the pressure relief mechanism 30, and also be beneficial to improving the reliability and service life of the pressure relief mechanism 30, thereby being beneficial to improving the reliability and service life of the end cap assembly.

[0145] According to some embodiments of the present application, the present application also provides a battery 1000, including the battery cell 100 provided by any of the above embodiments.

[0146] According to some embodiments of the present application, the present application provides an electrical device, including the battery provided in any of the above embodiments, and the battery is used to provide electrical energy.

[0147] To better understand the battery cell 100 provided in the embodiments of the present application, based on the same inventive concept, embodiments of the above battery cell 100 in actual applications are provided herein for illustration.

[0148] The embodiments of the present application provide a battery cell 100, which includes a housing 10, an electrode assembly 20, and a pressure relief mechanism 30. The housing 10 includes a wall portion 11. The electrode assembly 20 is disposed inside the housing 10, and the pressure relief mechanism 30 is disposed on the wall portion 11. The pressure relief mechanism 30 includes a body 31, a pressure relief portion 32, and a strengthening portion 33. The body 31 is connected to the wall portion 11. The pressure relief portion 32 is disposed on the body 31 and is configured to relieve the internal pressure of the battery cell 100. The pressure relief portion 32 includes a first recess 321 formed by the body 31 recessing from one side in the first direction X. The strengthening portion 33 includes a second recess 331 formed by the body 31 recessing from at least one side in the first direction X. Wherein, strengthening portions 33 are disposed on both sides of the body 31 along the first direction X, and the strengthening portions 33 and the pressure relief portion 32 are spaced apart.

[0149] In the first direction X, the minimum thickness dimension of the body 31 opposite to the second recess 331 is greater than the minimum thickness dimension of the body 31 opposite to the first recess 321. The orthographic projection of the pressure relief portion 32 on the body 31 and the orthographic projection of the strengthening portion 33 on the body 31 are staggered with each other. The minimum distance between adjacent pressure relief portions 32 and strengthening portions 33 is greater than or equal to 2 mm. The extension trajectories of the strengthening portions 33 and the pressure relief portions 32 are the same in shape and each presents an annular trajectory. The body 31 is separated by the pressure relief portion 32 to form a first region T1 and a second region T2. The second region T2 surrounds the first region T1. The number of strengthening portions 33 disposed in the first region T1 is greater than the number of strengthening portions 33 disposed in the second region T2.

[0150] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing including a wall portion; An electrode assembly disposed within the housing; A pressure relief mechanism disposed on the wall portion, the pressure relief mechanism including a body, a pressure relief portion, and a strengthening portion, the body being connected to the wall portion, the pressure relief portion being disposed on the body and configured to relieve the internal pressure of the battery cell; Wherein, strengthening portions are disposed on both sides of the body along a first direction, and the strengthening portions and the pressure relief portion are spaced apart.

2. The battery cell according to claim 1, wherein The pressure relief portion includes a first recess recessed from one side of the body along the first direction.

3. The battery cell according to claim 2, wherein The strengthening portion includes a second recess recessed from at least one side of the body along the first direction. In the first direction, the strength of the body opposite to the second recess is greater than the strength of the body opposite to the first recess.

4. The battery cell according to claim 3, characterized in that, In the first direction, the minimum thickness dimension of the body opposite to the second recess is greater than the minimum thickness dimension of the body opposite to the first recess.

5. The battery cell according to any one of claims 1 to 4, characterized in that, Along the first direction, the orthographic projections of the strengthening portions disposed on both sides of the body on the body are staggered with each other.

6. The battery cell according to claim 1, wherein Along the first direction, the orthographic projection of the pressure relief portion on the body and the orthographic projection of the strengthening portion on the body are staggered with each other.

7. The battery cell according to claim 1, characterized in that The minimum distance between adjacent pressure relief portions and strengthening portions is greater than or equal to 2 mm.

8. The battery cell according to claim 1, wherein, The extension trajectory of the strengthening portion has the same shape as the extension trajectory of the pressure relief portion.

9. The battery cell according to claim 1, characterized in that, The extension trajectories of the strengthening portion and the pressure relief portion are each in an annular trajectory.

10. The battery cell according to claim 9, wherein, The body is separated by the pressure relief portion into a first region and a second region. The second region surrounds the first region, and at least one strengthening portion is disposed in the first region.

11. The battery cell according to claim 10, wherein, At least one strengthening portion is disposed in the second region.

12. The battery cell according to claim 11, wherein The number of strengthening portions disposed in the first region is greater than the number of strengthening portions disposed in the second region.

13. The battery cell according to claim 1, wherein The housing includes an end cap and a housing body. The housing body has an opening. The end cap is connected to the housing body and closes the opening. The wall portion is formed on either the end cap or the housing body.

14. A end cap assembly for a battery cell, characterized in that, Comprising: An end cap; A pressure relief mechanism disposed on the end cap, the pressure relief mechanism including a body, a pressure relief portion, and a strengthening portion, the body being connected to the end cap, the pressure relief portion being disposed on the body and configured to relieve the internal pressure of the battery cell; Wherein, strengthening portions are disposed on both sides of the body along a first direction, and the strengthening portions and the pressure relief portion are spaced apart.

15. A battery, characterized in that, A battery cell according to any one of claims 1 to 13.

16. An electrical device, characterized in that, A battery according to claim 15, the battery being configured to provide electrical energy.

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